Meyers, Joseph Carr (Farmington Hills, MI, US)
Brown, Todd Allen (Dearborn, MI, US)

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11/019148

04/29/2008

12/21/2004

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Ford Global Technologies, LLC (Dearborn, MI, US)

340/440

701/45, 340/465, 340/441, 701/71, 701/70, 340/439, 701/42, 701/46

B60Q1/00

340/441, 340/439, 701/71, 701/46, 701/70, 701/45, 701/42, 340/440, 340/438, 340/465

2917126	Driving control safety mechanism for tractors	December, 1959	Phillips
3604273	ANGULAR RATE SENSOR	September, 1971	Kwok et al.
3608925	APPARATUS FOR OFFSETTING CENTRIFUGAL FORCE AFFECTING MOTOR VEHICLES	September, 1971	Murphy
3797893	BRAKE FORCE CONTROL SYSTEM FOR VEHICLES	March, 1974	Burckhardt
3899028	Angular position sensing and control system, apparatus and method	August, 1975	Morris et al.
3948567	Sway control means for a trailer	April, 1976	Kasselmann et al.
3972543	Combination vehicle yaw stabilizer	August, 1976	Presley et al.
4023864	Automatic stability control system with strain gauge sensors	May, 1977	Lang et al.
RE30550	Automatic trailer sway sensing and brake applying system	March, 1981	Reise
4480714	System for preventing carrier from turning sideways	November, 1984	Yabuta et al.
4592565	Apparatus for detecting an overturning moment in a moving vehicle, and jackknifing in a trailer-truck combination	June, 1986	Eagle
4597462	Steering system for vehicles	July, 1986	Sano et al.
4624476	Vehicle suspension apparatus	November, 1986	Tanaka et al.
4650212	Vehicle suspension system	March, 1987	Yoshimura	280/707
4679808	Vehicle motion estimating system	July, 1987	Ito et al.
4690553	Road surface condition detection system	September, 1987	Fukamizu et al.
4705130	Method of controlling vehicle	November, 1987	Fukunaga et al.
4761022	Suspension controller for improved turning	August, 1988	Ohashi et al.	280/772
4765649	System for vehicle body roll control detecting and compensating for changes of loaded vehicle weight	August, 1988	Ikemoto et al.
4767588	Vehicle control system for controlling side slip angle and yaw rate gain	August, 1988	Ito
4778773	Method of manufacturing a thin film transistor	October, 1988	Sukegawa
4809183	Speed control system for motor vehicles operating in a curved path	February, 1989	Eckert
4827416	Method and system for controlling automotive suspension system, particularly for controlling suspension characteristics in accordance with road surface conditions	May, 1989	Kawagoe et al.
4846496	Vehicle suspension apparatus	July, 1989	Tanaka et al.
4872116	Vehicle motion estimating system of hybrid type	October, 1989	Ito et al.
4888696	Actively controlled automotive suspension system with acceleration and angular velocity dependent anti-pitching and/or anti-rolling feature	December, 1989	Akatsu et al.
4898431	Brake controlling system	February, 1990	Karnopp et al.
4930082	Control apparatus for a vehicular suspension system	May, 1990	Harara et al.
4951198	Friction detecting device for vehicles	August, 1990	Watanabe et al.
4960292	Air bag restraint systems	October, 1990	Sadler
4964679	Monitoring method and apparatus for a brake system of heavy-duty vehicles	October, 1990	Rath
4967865	Supplementary steering system	November, 1990	Schindler
4976330	Vehicle traction control system for preventing vehicle turnover on curves and turns	December, 1990	Matsumoto	180/197
4998593	Steering and brake controlling system	March, 1991	Karnopp et al.
5033770	Controlling apparatus for active suspension system for automotive vehicle	July, 1991	Kamimura et al.
5058017	System for control of vehicle suspension	October, 1991	Adachi et al.
5066041	Control system for stabilizing the rolling of a vehicle	November, 1991	Kindermann et al.
5088040	Automotive control system providing anti-skid steering	February, 1992	Matsuda et al.
5089967	Auxiliary steering system associated with anti-skid control system for use in motor vehicle	February, 1992	Haseda et al.
5163319	Method and a device for recognizing the condition of a road	November, 1992	Spies et al.
5200896	Method for estimating longitudinal acceleration or deceleration of a vehicle body	April, 1993	Sato et al.
5208749	Method for controlling active suspension system on the basis of rotational motion model	May, 1993	Adachi et al.
5224765	Control system for distributing braking forces applied to left and right wheels in automotive vehicles	July, 1993	Matsuda
5228757	System for controlling behavior of vehicle during braking and during a steering maneuver	July, 1993	Ito et al.
5239868	Angular rate detecting device	August, 1993	Takenaka et al.
5247466	Angular rate detection apparatus, acceleration detection apparatus and movement control apparatus, of moving body	September, 1993	Shimada et al.
5261503	Adaptive steering control system	November, 1993	Yasui
5265020	Torque distribution control apparatus for four wheel drive	November, 1993	Nakayama	364/424.05
5274576	Apparatus for measuring the yaw rate of a vehicle	December, 1993	Williams
5278761	Method for vehicular wheel spin control that adapts to different road traction characteristics	January, 1994	Ander et al.
5282134	Slant transform/signal space crash discriminator	January, 1994	Gioutsos et al.
5297646	Control system for optimizing operation of vehicle performance/safety enhancing systems such as 4WS, 4WD active suspensions, and the like	March, 1994	Yamamura et al.
5307274	Zero-point correction device for a gravity-type accelerometer	April, 1994	Takata et al.
5311431	Method of obtaining the yawing velocity and/or transverse velocity of a vehicle	May, 1994	Cao et al.
5311956	Electric control apparatus for rear wheel steering mechanism of wheeled vehicle	May, 1994	Sugiyama
5324102	Method and apparatus for regulating the braking force of motorcycles	June, 1994	Roll et al.
5335176	Safety system for vehicles	August, 1994	Nakamura
5365439	Method and apparatus for detecting friction coefficient of road surface, and method and system for four-wheel steering of vehicles using the detected friction coefficient of road surface	November, 1994	Momose et al.
5370199	Vehicle traction control system	December, 1994	Akuta et al.	180/197
5408411	System for predicting behavior of automotive vehicle and for controlling vehicular behavior based thereon	April, 1995	Nakamura et al.
5446658	Method and apparatus for estimating incline and bank angles of a road surface	August, 1995	Pastor et al.
5455770	Vehicle movement dynamics control system	October, 1995	Hadeler et al.
5510989	System for influencing the travel dynamics of an automobile	April, 1996	Zabler et al.
5515277	Method and system for controlling active suspensions of a vehicle during acceleration and deceleration	May, 1996	Mine
5548536	Method for determining quantities which characterize the driving behavior	August, 1996	Ammon
5549328	Roll control system	August, 1996	Cubalchini
5560688	Pressure control apparatus for adjusting brake pressure in a vehicle	October, 1996	Schappler et al.
5579245	Vehicle slip angle measuring method and a device therefor	November, 1996	Kato
5598335	System and method for controlling a shift position when a vehicle travels along a steeply sloped road or a sharply curved road	January, 1997	You
5602734	Automobile air bag systems	February, 1997	Kithil
5610575	Method and system for detecting vehicle roll-over	March, 1997	Gioutsos
5627756	Device for controlling turn behavior of vehicle	May, 1997	Fukada et al.
5634698	System for controlling brake pressure based on fuzzy logic using steering angle and yaw speed	June, 1997	Cao et al.
5640324	Dynamic behavior control apparatus of automotive vehicle	June, 1997	Inagaki
5648903	Four wheel steering control utilizing front/rear tire longitudinal slip difference	July, 1997	Liubakka
5671982	System for applying a yawing control moment by setting brake valve opening and closing times	September, 1997	Wanke
5676433	Device for estimating side slide velocity of vehicle compatible with rolling and cant	October, 1997	Inagaki et al.
5694319	Process for the determining travel-situation-dependent steering angle	December, 1997	Suissa et al.
5703776	Method and device for measuring slope of driving road	December, 1997	Soung
5707117	Active brake control diagnostic	January, 1998	Hu et al.
5707120	Stability control device of vehicle improved against hunting	January, 1998	Monzaki et al.
5720533	Brake control system	February, 1998	Pastor et al.
5723782	Method of land vehicle suspension evaluation and design through roll angle analysis	March, 1998	Bolles, Jr.
5732377	Process for controlling driving stability with a yaw rate sensor equipped with two lateral acceleration meters	March, 1998	Eckert
5732378	Method for determining a wheel brake pressure	March, 1998	Eckert et al.
5732379	Brake system for a motor vehicle with yaw moment control	March, 1998	Eckert et al.
5736939	Apparatus and method for determing a condition of a road	April, 1998	Corcoran
5737224	Apparatus and method for tripping a system for the protection of occupants of a vehicle	April, 1998	Jeenicke et al.
5740041	Vehicle occupant restraint system responsive to accelleration	April, 1998	Iyoda
5740877	Driving-torque distribution control system for four-wheel drive vehicles	April, 1998	Sasaki
5742918	Method and apparatus for dynamically compensating a lateral acceleration of a motor vehicle	April, 1998	Ashrafi et al.
5742919	Method and apparatus for dynamically determining a lateral velocity of a motor vehicle	April, 1998	Ashrafi et al.
5762406	Vehicle motion control system involving priority oversteer and understeer restraining control	June, 1998	Yasui et al.
5782543	Stability control device of vehicle compatible with foot braking	July, 1998	Monzaki et al.
5787375	Method for determining steering position of automotive steering mechanism	July, 1998	Madau et al.
5801647	Method and apparatus for measuring road surface conditions	September, 1998	Survo et al.
5809434	Method and apparatus for dynamically determically determining an operating state of a motor vehicle	September, 1998	Ashrafi et al.
5816670	Vehicle brake control device	October, 1998	Yamada et al.
5825284	System and method for the detection of vehicle rollover conditions	October, 1998	Dunwoody et al.
5842143	Circuit configuration for evaluating yaw rate sensor signals	November, 1998	Lohrenz et al.
5857160	Sensor-responsive control method and apparatus	January, 1999	Dickinson et al.
5857535	Seat for self-propelled narrow-track vehicle	January, 1999	Brooks
5869943	Vehicle motion control system	February, 1999	Nakashima et al.
5878357	Method and apparatus for vehicle yaw rate estimation	March, 1999	Sivashankar et al.
5890084	Controller for vehicular safety device	March, 1999	Halasz et al.
5893896	Apparatus and method for stability controlling vehicular attitude using vehicular braking system	April, 1999	Imamura et al.
5925083	Method of correcting steering of a road driven vehicle	July, 1999	Ackermann
5931546	Vehicle motion control system	August, 1999	Nakashima et al.
5944137	Vehicle steering system	August, 1999	Moser et al.
5944392	Road surface condition determining system	August, 1999	Tachihata et al.
5946644	Steering center indicator device	August, 1999	Cowan et al.
5964819	Vehicle yawing behavior control apparatus	October, 1999	Naito
5971503	Hydraulic control unit with ambient temperature compensation during fluid pressure delivery	October, 1999	Joyce et al.
6002974	Vehicle rollover sensing using extended kalman filter	December, 1999	Schiffmann	701/36
6002975	Vehicle rollover sensing	December, 1999	Schiffmann et al.
6026926	Electric power steering apparatus	February, 2000	Noro et al.
6038495	Vehicle rollover sensing using short-term integration	March, 2000	Schiffman
6040916	Process and apparatus for determining the condition of a road surface	March, 2000	Griesinger
6050360	Apparatus and method for producing a desired return torque in a vehicle power steering system having a rotational steering position sensor	April, 2000	Pattok et al.
6055472	Arrangement for detecting motor-vehicle roll-overs	April, 2000	Breunig et al.
6062336	Adaptive variable effort power steering system	May, 2000	Amberkar et al.
6065558	Anti-rollover brake system	May, 2000	Wielenga
6073065	Method for detecting a bank angle experienced by a moving vehicle	June, 2000	Brown et al.
6079513	Steering apparatus for vehicle	June, 2000	Nishizaki et al.
6081761	Automatic deceleration control method and apparatus for a vehicle	June, 2000	Harada et al.
6085860	Method and apparatus for operating a steering system for a motor vehicle	July, 2000	Hackl et al.
6086168	Method for operating a motor vehicle with driving-stabilizing brake interventions	July, 2000	Rump
6089344	Method and apparatus for determining the center position of a steering system	July, 2000	Baughn et al.
6104284	Roll over determining method	August, 2000	Otsuka
6121873	Device for producing electrical signals indicating yaw rate, lateral acceleration and roll rate of vehicle body	September, 2000	Yamada et al.
6122568	Method and apparatus for determining the dynamic stability of an automotive vehicle	September, 2000	Madau et al.
6122584	Brake system control	September, 2000	Lin et al.
6129172	Electric power steering apparatus	October, 2000	Yoshida
6141604	Method and arrangement for detecting a vehicle roll-over	October, 2000	Mattes et al.
6141605	Determining the direction of travel of an automotive vehicle from yaw rate and relative steering wheel angle	October, 2000	Joyce
6144904	Instant detection / diagnosis of abrupt bias fault in signals of vehicle motion sensors	November, 2000	Tseng
6149251	Process and device for controlling a braking force of at least one wheel of a vehicle	November, 2000	Wuerth et al.
6161905	Active brake control including estimation of yaw rate and slip angle	December, 2000	Hac et al.
6169939	Method of generating a vehicle lateral acceleration signal for use in an active tilt control system	January, 2001	Raad et al.
6169946	Device and method for controlling accident protection triggering devices in motor vehicles	January, 2001	Griessbach
6176555	Method and device for controlling handling dynamics of motor vehicles	January, 2001	Semsey
6178375	Method and device for determining the inertial position of a vehicle	January, 2001	Breunig
6179310	Vehicle roll stabilizing system	January, 2001	Clare et al.
6179394	Active brake balance control method	January, 2001	Browalski et al.
6184637	Electric power steering apparatus	February, 2001	Yamawaki et al.
6185485	Relative vehicle platform having synchronized adaptive offset calibration for lateral accelerometer and steering angle sensor	February, 2001	Ashrafti et al.
6185497	Apparatus for controlling behavior of vehicle using brakes	February, 2001	Taniguchi et al.
6186267	Method and apparatus for operating a steering system for a motor vehicle	February, 2001	Hackl et al.
6192305	Vehicle rollover sensing using yaw rate estimation	February, 2001	Schiffmann
6195606	Vehicle active brake control with bank angle compensation	February, 2001	Barta et al.
6198988	Method for detecting an erroneous direction of travel signal	March, 2001	Tseng
6202009	Method for detecting fault of vehicle motion sensors	March, 2001	Tseng
6202020	Method and system for determining condition of road	March, 2001	Kyrtsos
6206383	Hydraulic control systems	March, 2001	Burdock
6219604	Steer-by-wire steering system for motorized vehicles	April, 2001	Dilger et al.
6223114	Process for controlling driving dynamics of a street vehicle	April, 2001	Boros et al.
6226579	Method and apparatus for operating a steering system for a motor vehicle	May, 2001	Hackl et al.
6227482	Gyroscope for remote-controlled helicopters	May, 2001	Yamamoto
6233510	Method and system for predicting road profile	May, 2001	Platner et al.
6236916	Autoguidance system and method for an agricultural machine	May, 2001	Staub et al.
6263261	Roll over stability control for an automotive vehicle	July, 2001	Brown et al.
6266596	Method and apparatus for controlling a mobile machine during start-up	July, 2001	Hartman et al.
6272420	Method and device for detecting motor vehicle tilt	August, 2001	Schramm et al.
6278930	Device for controlling spin/driftout of vehicle compatibly with roll control	August, 2001	Yamada et al.
6282471	Vehicle roll control	August, 2001	Burdock et al.
6282472	Electric power steering system with boost curve having portions defined by polynomial equations	August, 2001	Jones et al.
6282474	Method and apparatus for detecting rollover of an automotive vehicle	August, 2001	Chou et al.
6290019	System and method for vehicle side rollover aversion	September, 2001	Kolassa et al.
6292734	Vehicle-behavior control apparatus and method	September, 2001	Murakami et al.
6292759	Vehicle attitude angle estimation using sensed signal blending	September, 2001	Schiffmann
6311111	Method and device for detecting motor vehicle tilt	October, 2001	Leimbach et al.
6314329	Compensation algorithm for initializing yaw rate sensor's zero point offset	November, 2001	Madau et al.
6315373	Roll control device of vehicle manageable of sudden failure of rolling condition detection means	November, 2001	Yamada et al.
6321141	Method and device for detecting motor vehicle tilt	November, 2001	Leimbach
6324445	Yaw rate detecting system for a vehicle	November, 2001	Tozu et al.
6324446	Roll over stability control for an automotive vehicle	November, 2001	Brown et al.
6324458	Device for controlling vehicle turn behavior with discrimination of drive direction	November, 2001	Takagi et al.
6330522	Rotational angle detector and method	December, 2001	Takeuchi
6332104	Roll over detection for an automotive vehicle	December, 2001	Brown et al.
6338012	Roll over stability control for an automotive vehicle	January, 2002	Brown et al.
6349247	Method and device for stabilizing a motor vehicle in order to prevent it from rolling over	February, 2002	Schramm et al.
6351694	Method for robust estimation of road bank angle	February, 2002	Tseng et al.
6352318	Wheel control state display apparatus	March, 2002	Hosomi et al.
6356188	Wheel lift identification for an automotive vehicle	March, 2002	Meyers et al.
6363309	Behavior control device of vehicle having means for avoiding miscontrol due to neutral shift of yaw rate sensor	March, 2002	Irie et al.
6370938	Method and device for determining a quantity describing the height of the center of gravity of a vehicle	April, 2002	Leimbach et al.
6394240	Vehicle roll damping	May, 2002	Barwick
6397127	Steering actuated wheel lift identification for an automotive vehicle	May, 2002	Meyers et al.
6419240	Vehicle roll control	July, 2002	Burdock et al.
6424897	Device for producing a signal to initiate actuation of a security system in a vehicle making an overturn	July, 2002	Mattes et al.
6428118	Arrangement and methods for avoiding rollovers when braking or accelerating motor vehicles	August, 2002	Blosch
6438464	Method and device for detecting the overturning hazard of a motor vehicle	August, 2002	Woywod et al.
6459990	Self-contained positioning method and system thereof for water and land vehicles	October, 2002	McCall et al.
6471218	Vehicle suspensions	October, 2002	Burdock et al.
6477480	Method and apparatus for determining lateral velocity of a vehicle	November, 2002	Tseng et al.
6496758	Rollover stability control for an automotive vehicle using front wheel actuators	December, 2002	Rhode et al.
6496763	System for detecting vehicle rollovers	December, 2002	Griessbach
6498976	Vehicle operator advisor system and method	December, 2002	Ehlbeck et al.
6502023	Device for estimating rolling condition of vehicle body with limits of roll angle and angular speed	December, 2002	Fukada
6526342	Vehicle suspensions	February, 2003	Burdock et al.
6529803	Roll over stability control for an automotive vehicle having rear wheel steering	March, 2003	Meyers et al.
6542792	Vehicle rollover detection apparatus and method	April, 2003	Schubert et al.
6547022	Vehicle traction control apparatus and method of traction control	April, 2003	Hosomi et al.
6553284	Process to prevent the overturning of a vehicle around its longitudinal axis	April, 2003	Holst et al.
6554293	Method for improving tilt stability in a motor vehicle	April, 2003	Fennel et al.
6556908	Attitude sensing system for an automotive vehicle relative to the road	April, 2003	Lu et al.
6559634	Vehicle wheel rotation detecting system and method	May, 2003	Yamada
6593849	Wheel lift identification for an automotive vehicle	July, 2003	Chubb
6598946	Vehicular brake control apparatus and vehicular brake control method	July, 2003	Nagae
6600414	Apparatus and method for detecting vehicle rollover having a discriminating safing function	July, 2003	Foo et al.
6600985	Roll sensor system for a vehicle	July, 2003	Weaver
6618656	Method for rollover detection for automotive vehicles with safety-related devices	September, 2003	Kueblbeck et al.
6631317	Attitude sensing system for an automotive vehicle	October, 2003	Lu
6644454	Running condition control system for vehicle and method	November, 2003	Yamada et al.
6650971	Method for establishing the angular position of a vehicle	November, 2003	Haas
6654674	Enhanced system for yaw stability control system to include roll stability control function	November, 2003	Lu et al.
6657539	Vehicle control apparatus and vehicle control method	December, 2003	Yamamoto et al.
6681196	Method and device for determining the absolute angle of rotation of an object that is rotating about an approximately horizontal rotational axis	January, 2004	Glaser et al.
6704631	Method and device for determining a corrected offset value	March, 2004	Winner et al.
6747553	Apparatus for detecting rotational state of wheel	June, 2004	Yamada et al.
6756890	Method and apparatus for stabilizing a vehicle in the presence of a tilt tendency	June, 2004	Schramm et al.
6799092	Rollover stability control for an automotive vehicle using rear wheel steering and brake control	September, 2004	Lu
20030182025	Method for determining the roll angle of a vehicle using an estimation of road bank angle	September, 2003	Tseng et al.

DE3616907	November, 1987
DE3815938	November, 1989
DE4321571	January, 1994
DE4227886	February, 1994
DE4228893	March, 1994
DE4335979	April, 1995
DE4342732	June, 1995
DE19907633	October, 1999
DE10025493	May, 2000
DE10065010	December, 2000
DE10046036	March, 2002
DE10133409	January, 2003
EP0430813	December, 1993			Safety device for motor vehicles
EP0662601	July, 1995			MULTISHAFT ANGULAR VELOCITY SENSOR.
EP0758601	February, 1997			Procedure for on board determination of dynamic safety margins of utility vehicles
EP1046571	April, 2000			Method for avoiding roll-over of road vehicles
EP1197409	September, 2001			Vehicle dynamics control method
FR2425342	December, 1979
GB2257403	January, 1993
GB2342078	April, 2000
JP62055211	September, 1985
JP63116918	May, 1988
JP63151539	June, 1988
JP63203456	August, 1988
JP1101238	April, 1989
JP2171373	July, 1990
JP3042360	February, 1991			MAGNETIC HEAD REVERSING DEVICE
JP3045452	February, 1991			PHOTOELECTRIC LENGTH MEASURING OR ANGLE MEASURING DEVICE
JP4008837	January, 1992
JP5016699	January, 1993
JP5254406	October, 1993
JP6278586	October, 1994
JP6297985	October, 1994
JP6312612	November, 1994
JP8080825	March, 1996
JP9005352	January, 1997
JP10024819	January, 1998			BRAKING POWER CONTROLLING DEVICE
JP10329682	December, 1998			TURNOVER PREVENTING DEVICE FOR VEHICLE
JP11011272	January, 1999			VEHICLE ROLL OVER PREVENTION DEVICE
JP11170992	June, 1999			ROLL OVER PREVENTIVE DEVICE OF VEHICLE
JP11254992	September, 1999			VEHICLE ROLLING TENDENCY DETERMINING DEVICE AND ROLLING PREVENTING DEVICE USING THE SAME
JP11255093	September, 1999			VEHICLE-BODY ROLL SUPPRESSION CONTROL SYSTEM
JP11304663	October, 1999			ESTIMATION OPERATION DEVICE OF CENTER-OF-GRAVITY HEIGHT OF VEHICLE
JP11304662	November, 1999			ESTIMATING AND COMPUTING APPARATUS FOR CENTER-OF-GRAVITY HEIGHT OF VEHICLE
JP11321603	November, 1999			ESTIMATING DEVICE OF VEHICLE SIDE SLIP ANGLE
SU816649	March, 1981
WO/2002/020318	March, 2002			LATERAL ACCELERATION SENSOR COMPENSATION FOR AN INCLINED MEASUREMENT PLANE
WO/2003/072397	September, 2003			METHOD AND DEVICE FOR RECOGNISING RAISED WHEELS OF A VEHICLE

U.S. Appl. No. 10/459,697, filed Jun. 11, 2003, Lu.
U.S. Appl. No. 10/608,909, filed Jun. 27, 2003, Lu.
A method for reducing on-road rollovers—anti-rollover braking, Thomas J. Wielenga, Dynamotive, LLC, International Congress and Exposition, Detroit, Michigan, Mar. 1-4, 1999.
Eger, R., Majjad, R., Naser, N., “Rollover simulation based on a nonlinear model”, SAE 98020.
Nalecz, A.G., Bindemann, A.C., Brewer H.K., “Dynamic analysis of vehicle rollover”, 12th International Conference on Experimental Safety Vehicles, Goteborg, Sweden, May 29-Jun. 1, 1989.
Niii, N., Nishijima, Y., Nakagaw, K., “rollover analysis method of a large-size bus”, JSAE 9540020, 1995.
Eger, R., Kiencke, U., “Modeling of rollover sequences”, Control Engineering Practice 11 (2003) 209-216.
Chen, Bo-Chiuan, Peng, Huei; “A Real-time Rollover Threat Index for Sports Utility Vehicles”, Proceedings of the American Control Conference, San Diego, CA, Jun. 1999.

Nguyen, Tai

Owens, Esq. Fred
Dickinson Wright PLLC

What is claimed is:

1. A method for determining wheel lift of a wheel of an automotive vehicle comprising the steps of: applying a change of torque to the wheel; measuring a change in a wheel condition since initiating the step of applying a change of torque; indicating wheel lift if the change in the wheel condition is greater than a predetermined value.

2. A method as recited in claim 1 wherein the condition is one selected from the group of acceleration and speed.

3. A method as recited in claim 1 further comprising the step of removing the change of torque; measuring a wheel condition after the step of removing the change of torque.

4. A method as recited in claim 3 further comprising the step of determining whether the second wheel condition is above a threshold.

5. A method as recited in claim 1 wherein the step of applying a change of torque comprises applying a brake to the wheel.

6. A method as recited in claim 5 further comprising the step of releasing the brake; determining a wheel condition after the step of releasing the brake; when the wheel condition does not increase over a reacceleration threshold, confirming wheel lift; when wheel speed condition increases over a reacceleration threshold, indicating wheel contact.

7. A method as recited in claim 1 wherein the step of applying a change of torque comprises applying engine torque.

8. A method for monitoring a predetermined condition of an automotive vehicle having a plurality of wheels comprising the steps of: determining a potential for the predetermined condition of the wheel; measuring a first wheel speed of a suspected lifting wheel; thereafter, changing the torque of a applied to the suspected lifting wheel from a first torque to a second torque; changing the torque from the vehicle applied to the suspected lifting wheel from the second torque to the first torque; measuring a second wheel speed of the suspected lifting wheel; determining a wheel speed change as a function of the first wheel speed and the second wheel speed; when the change in wheel speed is greater than a reacceleration threshold, confirming the wheel lift.

9. A method as recited in claim 8 wherein the predetermined condition is determining a potential for wheel lift comprises determining the potential for wheel lift as a function of roll angle, steering wheel angle, and road bank angle.

10. A method as recited in claim 8 wherein the step of changing the torque comprises the step of applying the brake.

11. A method as recited in claim 8 wherein the step of changing the torque comprises the step of applying engine torque.

12. A method as recited in claim 8 wherein a predetermined condition comprises a sensor failure.

13. A method as recited in claim 8 wherein the predetermined condition comprises wheel lift.

14. A method as recited in claim 8 further comprising the step of correcting lift by applying the brakes.

15. A method as recited in claim 8 further comprising the step of correcting lift by applying a steering correction.

16. A method as recited in claim 8 further comprising the step of calculating a traction level after the step of confirming wheel lift.

17. A system for detecting lift of a wheel of an automotive vehicle comprising: a speed sensor coupled to the wheel producing a wheel speed signal; a torque control system coupled to the wheel for changing the torque at applied to the wheel; a controller coupled to the said torque control system and the wheel speed sensor, said controller determining lift by changing the torque of applied to the wheel, increasing the a brake torque until a maximum brake torque threshold is achieved, detecting a change in wheel speed since the application of the brake torque, comparing the change in wheel speed to a threshold, when the change in wheel speed is above the wheel speed change threshold value, indicating wheel lift, when the brake torque reaches a maximum value before the change in wheel speed reaches the threshold, holding the brake torque for a predetermined amount of time, continuing to monitor the change in wheel speed during a hold duration, determining a second change in wheel speed, comparing the second change in wheel speed to the threshold value, when the second chnage in wheel speed exceeds the threshold value during the hold duration, indicating lift.

18. A method for determining wheel lift of a vehicle comprising the steps of: applying a torque to the a wheel by applying a brake torque; increasing the brake torque to build until a maximum brake torque threshold is achieved; detecting the a change in wheel speed since the application of brake torque; comparing the change in wheel speed to a wheel speed change threshold; when the change in speed is above the wheel speed change threshold value, indicating wheel lift; when the brake torque reaches a maximum value before the change in wheel speed reaches the wheel speed change threshold, holding the torque for a predetermined amount of time; continuing to monitor the change in wheel speed during a hold duration; determining a second change in wheel speed; comparing the second wheel speed to the threshold value; when the second wheel speed exceeds the threshold value during the hold duration, indicating a wheel lift.

19. A method as recited in claim 18 further comprising the steps of: releasing the torque; determining a wheel speed change; when the wheel speed change is greater than a reacceleration threshold, indicating wheel contact; when the wheel speed change is less than the reacceleration threshold, confirming an indication of wheel lift.

20. A method as recited in claim 18 further comprising the step of calculating a traction level.

21. A method as recited in claim 18 further comprising the step of when wheel lift is detected, continually monitoring the wheel speed change for a sudden increase to acknowledge wheel contact.

22. A method for monitoring wheel lift of an automotive vehicle having a plurality of wheels comprising the steps of: determining a potential for wheel lift of the wheel as a function of road bank angle; measuring a first wheel speed of a suspected lifting wheel; thereafter, changing a torque of the suspected lifting wheel from a first torque to a second torque; changing the torque of the suspected lifting wheel from the second torque to the first torque; measuring a second wheel speed of the suspected lifting wheel; determining a wheel speed change as a function of the first wheel speed and the second wheel speed; when the change in wheel speed is greater than a reacceleration threshold, confirming wheel lift.

23. A method for monitoring a sensor failure condition of an automotive vehicle having a plurality of wheels comprising the steps of: determining a potential for sensor failure; measuring a first wheel speed; thereafter, changing a torque of a suspected lifting wheel from a first torque to a second torque; changing the torque from the second torque to the first torque; measuring a second wheel speed; determining a wheel speed change as a function of the first wheel speed and the second wheel speed; when the change in wheel speed is greater than a reacceleration threshold, confirming the sensor failure.

TECHNICAL FIELD

The present invention relates generally to a dynamic behavior control apparatus for an automotive vehicle, and more specifically, to a method and apparatus for determining whether a wheel of an automotive vehicle has lifted from the pavement.

BACKGROUND

Dynamic control systems for automotive vehicles have recently begun to be offered on various products. Dynamic control systems typically control the yaw of the vehicle by controlling the braking effort at various wheels of the vehicle. By regulating the amount of braking at each corner of the vehicle, the desired direction of the vehicle may be maintained.

Typically, the dynamic control systems do not address roll of the vehicle. For high profile vehicles in particular, it would be desirable to control the rollover characteristics of the vehicle to maintain the vehicle position with respect to the road. That is, it is desirable to maintain contact of each of the four tires of the vehicle on the road.

Vehicle rollover and tilt control (or body roll) are distinguishable dynamic characteristics. Tilt control maintains the body on a plane or nearly on a plane parallel to the road surface. Rollover control is used to maintain the vehicle wheels on the road surface.

Such systems typically use position sensors to measure the relative distance between the vehicle body and the vehicle suspension. One drawback to such systems is that the distance from the body to the road must be inferred.

It would therefore be desirable to provide a rollover detection system having reduced costs and increased reliability in predicting the occurrence of a rollover.

SUMMARY OF THE INVENTION

It is therefore one object of the invention to provide a rollover detection system that may be used in conjunction with the dynamic stability control system of the vehicle to determine rollover.

In one aspect of the invention, a wheel lift identification system for an automotive vehicle includes a speed sensor coupled to the vehicle producing a wheel speed signal. A torque control system is coupled to the wheel for charging the torque at the wheel. A controller is coupled to the torque control system and the speed sensor. The controller determines lift by changing the torque of the wheel, measuring the change in wheel speed since the torque was changed, and indicating a wheel lift if the change in the wheel speed is greater than a predetermined value.

In a further aspect of the invention, a method for determining wheel lift of a vehicle comprises the steps of:

• • changing the torque of a wheel;
  • measuring the change in wheel speed since the step of changing torque; and,
  • indicating wheel lift if the change in wheel speed is greater than a predetermined value.

In a further aspect of the invention, the changing of the torque of the wheel may be performed by increasing the brake pressure for that wheel. When the wheel speed has significant deceleration, a wheel flag is set. When the brake pressure is released and the wheel speed changes greater than a reacceleration threshold, then wheel contact is assumed. If the wheel speed does not increase over the reacceleration threshold within a predetermined time, then wheel lift status is confirmed. As an alternative, driveline torque may be used.

One advantage of the invention is that in vehicles employing a dynamic stability control system, additional sensors may not be required.

Other objects and features of the present invention will become apparent when viewed in light of the detailed description of the preferred embodiment when taken in conjunction with the attached drawings and appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partial cutaway view of an automotive vehicle having a wheel lift identification system according to the present invention.

FIG. 2 is a flow chart of a wheel lift identification system according to the present invention.

FIG. 3A is a plot of pressure versus time for a wheel lift identification system according to one embodiment of the present invention.

FIG. 3B is a plot of wheel speed versus time for a wheel lift identification system according to one embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT

The present invention is described with respect to a wheel lift identification system for an automotive vehicle. Those skilled in the art will recognize that the present invention may be incorporated into a rollover prevention system for an automotive vehicle.

Referring now to FIG. 1, an automotive vehicle 10 has a plurality of wheels 12 , two of which are shown as elevated above a road plane 14 . A roll control system 16 is included within vehicle 10 . The roll control system 16 is used to counteract the lifting of wheels 12 from road plane 14 as will be further described below. Roll control system 16 includes a roll controller 18 that is preferably microprocessor based. Roll controller 18 may be part of a dynamic stability control system of the automotive vehicle 10 . Roll controller 18 is coupled to a torque control system 20 that is used to control the torque of the wheels 12 . Although torque control system 20 is illustrated as a separate item, torque control system 20 may be included in roll controller 18 which may in turn be included within a dynamic stability control system. Torque control system 20 may act in conjunction with the electronic engine controller, a driveline engagement mechanism or braking system, or a combination of these to control the torque at one or all of the wheels 12 . Torque controller 20 and roll controller 18 may be coupled to wheel speed sensors 22 located at each of the wheels 12 . Wheel speed sensors 22 provide roll controller 18 with a signal indicative of the speed of the individual wheel to which it is attached. Various types of wheel speed sensors including toothed-wheel type systems would be evident to those skilled in the art.

Other sensors 24 may be coupled to roll control system 16 . For example, roll angle sensors, steering wheel angle sensors, yaw rate sensors, and other sensors may be incorporated therein. Other sensors 24 , as will be further described below, may be used to identify a condition suitable for the potential of wheel lift. Such a condition may initiate further action by roll control system 16 to verify wheel lift.

In the following example, the application of brake pressure is used to provide the change in torque. However, other methods such as applying engine torque may also be used to change the amount of torque at a wheel. Further references to the application of torque to a wheel may include hydraulic or electric brake torque, changes in engine torque or engagement of driveline torque through the use of an electronically controlled transfer case, differential, transmission or clutch. The present invention may also be used to determine if a sensor has failed in the roll control system 16 . That is, if roll is suspected by a particular sensor but all other conditions or sensors indicate otherwise, the sensor may be operating improperly. Also, although speed is used, wheel acceleration may also be used in place of speed as would be evident to those skilled in the art.

Referring now to FIG. 2, in step 30 , if a roll sensor failure is suspected or in step 32 if wheel lift is suspected by the roll control system 16 , block 34 initiates the wheel lift determination process. In step 36 , torque is applied to the wheel suspected of lifting and the wheel speed at the suspected wheel is stored. In step 38 , the torque is increased by applying a test pulse of torque to the suspected wheel. Torque is applied until a torque threshold (Torque_Max) is achieved. In step 40 , if the torque is greater than the Torque_Max, the torque is held constant in step 42 . In step 44 , if the time as counted by the Build_Counter is greater than a predetermined time, step 46 is executed in which the torque is released and the wheel speed at the initiation of the release of torque is stored. In step 44 , if the counter is not greater than the predetermined hold time, the counter is incremented in step 48 . After step 48 the change in wheel speed is compared to a predetermined change in wheel speed. If the wheel speed change is not greater than a predetermined speed in step 50 , steps 38 - 44 are again executed. If the wheel speed change is greater than a predetermined speed, this indicates a lifted wheel. In this case, step 52 is executed in which a wheel lift status flag is set. After step 52 , step 54 is executed in which the build counter is reset.

Referring back to step 40 , if the torque is not greater than the torque threshold then step 50 is executed.

Referring back to step 46 , after the wheel speed is recorded after the torque release, step 56 is executed. In step 56 torque is released. After step 56 , step 58 is implemented in which the wheel speed change is compared to a reacceleration threshold. The reacceleration threshold is a predetermined value that corresponds to a wheel speed change that should be achieved should wheel contact be reestablished. The wheel speed change is determined from the time that the torque was released. If the wheel speed change is greater than a reacceleration threshold or if the wheel lift status from steo 52 is zero, wheel contact is assumed. In such a case the traction level may be calculated in step 60 . If the wheel speed does not increase over the reacceleration threshold, then the wheel lift status is confirmed beginning with step 70 .

Referring back to step 58 , if the wheel speed is less than the reacceleration threshold, step 62 compares the Dump_Counter to a predetermined dump time. If the predetermined dump time is greater than the Dump_Counter, then the Dump_Counter is incremented in step 64 and steps 56 and 58 are again executed. If the Dump_Counter is greater than the predetermined dump time, then the wheel lift status flag is set in step 66 and the Dump_Counter is reset in step 68 . After step 68 , the process is reinitiated and returns to step 36 .

Returning back to step 60 , the traction level is calculated in step 60 . After step 60 , the plausibility of a sensor failure is determined. If, for example, the process was initiated based on the suspicion of a sensor failure from block 30 above and no wheel lift was detected, a sensor failure is indicated in step 72 . For either result, if a sensor failure is indicated by block 70 or not, the build counter and Dump_Counter are cleared in block 74 and the wheel lift status is cleared in block 76 . The end of the routine occurs in block 78 .

Thus, as can be seen, the application of torque can be used to first determine whether a suspected wheel has lifted from the pavement. For confirmation, the removal of the torque and the resulting wheel speed change may be used to confirm the initial finding. Advantageously, the system may be implemented in a dynamic stability system of an automotive vehicle without adding further sensors. If rollover is detected, then the rollover can be corrected by applying the brakes or generating a steering correction.

Referring now to FIG. 3A, various lines 90 , 92 , 94 are illustrated during the build time to illustrate the variation in pressure of the braking system due to wear and other effects of the brakes. Lines 90 , 92 94 have little effect on the overall operation of the system. Thus, the thresholds and parameters are selected so that the system is robust to wear and system variation. The maximum pressure P _max is reached and maintained for a hold time (such as set forth in step 42 above) until it is released.

Referring now to FIG. 3B, a plot of wheel speed corresponding to the various times is illustrated. As shown, the wheel speed of a loaded wheel is illustrated by line 96 which is higher than the wheel speed of a lifted wheel illustrated by line 98 .

While particular embodiments of the invention have been shown and described, numerous variations alternate embodiments will occur to those skilled in the art. Accordingly, it is intended that the invention be limited only in terms of the appended claims.