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7402123 |
Automatic transmission control method and system having fail-safe function
In an automatic transmission control system and method, an electronic control unit is programmed to output a command to establish another gear stage different from the gear stage at the time of...
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6961646 |
Automatic transmission control system with direct electronic swap-shift control
A control system and control method for an automotive vehicle having a multiple-ratio automatic transmission having two gearsets arranged in series relationship for delivering vehicle engine power...
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6755767 |
Speed-change control apparatus for automatic transmission
The invention has been made to eliminate a feeling of two-phase speed-change operations by causing a speed-change operation to proceed continuously when the speed-change operation is performed...
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6746359 |
Shift control method for an automatic transmission
A primary shift portion has a first predetermined speed ratio at a first shift-speed, a second predetermined speed ratio at a second shift-speed, a speed ratio of “1” at third and fifth...
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6645122 |
Control system for an automatic transmission
A control system for an automatic transmission includes a torque converter which hydraulically transmits rotation of the driving power source to the speed change gear unit, a first friction...
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6508738 |
Transmission
In a transmission which transmits a power from an electrical motor 1 to a countershaft 30 with a speed change, a drive side rotating member which is coupled to a main shaft 10 experiences a...
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6488605 |
Transmission system, especially for a motor vehicle
The present invention relates to a transmission system, especially for use in a motorized vehicle. More particularly, the present invention discloses the use of a flywheel for assisting an engine...
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6457382 |
Method and apparatus for shifting ranges in a torque reversing mechanical transmission coupled to a hydrostatic transmission
A transmission assembly having a variable displacement hydraulic device which controls a ratio of an input speed to an output speed of the hydrostatic transmission is disclosed. The transmission...
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6450912 |
Hydromechanical transmission having a continuously variable transmission ratio
A transmission comprises: an input shaft intended to be coupled to a motor; an output shaft; an epicyclic reduction unit with an input sun wheel, a ring gear and first and second output shafts...
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6409628 |
Method and apparatus for preventing hunting between ranges in a continuously variable transmission
A transmission assembly is disclosed. The transmission assembly includes a continuously variable transmission driven by an input shaft at an input speed, a mechanical transmission coupled to the...
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6122583 |
Upshift and downshift control valve system for multiple ratio automatic transmission
A control valve system for a multiple ratio transmission with a high ratio clutch and an intermediate ratio brake servo including a first solenoid operated valve that generates a control pressure...
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5911645 |
Process for operating a stepless drive unit consisting of an internal combustion engine and a power branching transmission
A drive unit is composed of an internal combustion engine (1) and of a continuously controllable division gear which comprises a continuously controllable hydrostatic engine/pump unit (4) and a...
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5809846 |
Method of power transmission in mechanical/hydraulic type transmission system
A method of power transmission in a mechanical/hydraulic type transmission system, by which changeover is smoothly effected between hydraulic power transmission and mechanical power transmission is...
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5682315 |
Method and system for controlling a split torque transmission
The present invention relates to a method and system for controlling a split torque transmission having a hydrostatic transmission and a mechanical transmission. The control system employs a...
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5636119 |
Downstream rate limiting method in transmission control
A downstream rate limiting control is provided for controlling a continuously variable transmission. The rate limiting control monitors a input and a current machine state and computes the...
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5629593 |
Output torque matching in a multi-speed electric vehicle
In an electrically driven vehicle having an automatic transmission for coupling motor output torque to at least one drivewheel through a selected one of at least a pair of speed ratios, a method of...
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5491635 |
Arrangement and a process for controlling a starting device of a vehicle drive
A starting operation for a vehicle is carried out in two phases, specifically in a first phase, the input rotational speed is led to a desired rotational speed, and in a following second phase, a...
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5349885 |
Hydraulic control system for controlling line pressure based on backtorque and throttle rate in an automatic transmission
An automatic transmission includes a multi-speed transmission gear mechanism having an input shaft, an output shaft and a plurality of friction coupling elements. A hydraulic control system...
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5135443 |
Arrangement and method for operating a variable drive unit
Arrangement and method of operating a variable drive unit with a selector switch for the preselection of a long-term speed and a control unit which allows for the continuous operation of a...
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5131296 |
Traction drive transmission and lock-up control
A traction drive transmission comprises a shift control valve. The shift control valve serves also as a lock-up inhibitor valve establishes a fluid communication whereby a lock-up mechanism of a...
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4776233 |
Hydromechanical transmission and hydromechanical speed-change mechanism
A hydromechanical transmission that can be used as an efficient continuously variable transmission has a pair of speed sensors for detecting the rotational speeds at the transmission ends of two...
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4766778 |
Inexpensive variable torque transmission with overdrive and method
The invention is a very inexpensive infinite ratio variable transmission which uses a rotatable case type fluid torque pump as the fluid coupled transfer between engine and planetary system. Its...
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4663714 |
Synchronized mid-mounted clutch for variable power train
A microprocessor controlled drive train having an engine-connected variable ratio speed transmission and a load-connected range gear transmission connected by a mid-mounted clutch disposed...
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4648040 |
Engine monitor/control microprocessor for continuously variable power train
Engine monitor/control microprocessor primarily effective to automatically adjust the engine power setting in a transmission power train in which the transmission drive reduction is variable in...
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4594666 |
Transmission monitor/control microprocessor for continuously variable power train
Transmission monitor/control microprocessor primarily effective to automatically adjust the effective drive reduction ratio of a power train of the type in which such transmission is variable by...
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4592454 |
Hydropneumatic system for recovering braking energy for urban vehicles
Hydropneumatic system for recovering braking energy for a vehicle comprising a power "shunt" transmission, characterized in that it comprises two hydraulic switches (19 and 20) or equivalent...
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4516755 |
Hydraulic winch control system
A hydraulic control system for a spooling drum of a reversible hoisting winch of the type having a bidirectional hydraulic motor for driving the drum via two planetary drives in series, with the...
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4368653 |
Hydromechanical transmission
In a hydromechanical transmission, low and high speed drive power trains are selectively completed in response to variation of the speed ratio between an input shaft and an output shaft. The...
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4287792 |
Variable gear ratio transmission
A constant meshed, infinitely variable gear ratio transmission using relatively low pressure, low volume hydraulic systems to control the transmission gear ratio. The transmission includes a gear...
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4254672 |
Control system for a stepless variable speed transmission
A control system for a stepless variable speed transmission of power splitting type for use in a vehicle in which the power from an engine is transmitted with a controllable speed and wherein part...
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4246806 |
Multi-mode hydromechanical transmission shift system
A multi-mode hydromechanical transmission shift system having a hydrostatic unit with at least one variable and reversible displacement component with a displacement control, a plurality of...
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4185521 |
Hydraulic control system for a hydrostatic-mechanical transmission
A hydraulic circuit adjusts an infinitely variable drive ratio hydro-mechanical transmission in response to movements of operators speed and torque controls to enable precise selection of the wheel...
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4122732 |
Hydromechanical mechanical continuously variable transmission
An automatic continuously variable transmission having a power train with a dual path hydromechanical unit and a multistep ratio mechanical gear unit connected in series for overall continuously...
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4111073 |
Progressively variable transmission
A power train having a single shaft gas turbine engine having high idle speed and higher maximum torque speed and a progressively variable ratio transmission matched and controlled to provide...
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4111074 |
Hydraulic control for hydromechanical transmission
A power transmission that includes hydraulically-operated clutches that are electively supplied with operating fluids by a selector valve that is controlled by an error signal means constructed to...
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4096768 |
Hydro-mechanical transmission
In a hydro-mechanical transmission for automobiles which has an input shaft, an output shaft, a differential gear set including an input element connected to the input shaft and an output element...
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4084451 |
Drive-transmitting mechanisms
A drive-transmitting arrangement for use in a motor vehicle, fork-lift truck or industrial machinery includes a differential or epicyclic gear assembly having an input member and two output...
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4082013 |
Hydrostatic transmission control
An electronic control for a hydrostatic or hydromechanical transmission governs the transmission ratio as a primary function of a manual ratio request and as a secondary function of throttle...
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4068543 |
Hydraulic transmission control device
A control system for a power dividing type hydraulic transmission in which the motive power supplied from an engine is transmitted mechanically. Part of the motive power is converted to hydraulic...
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4043227 |
Hydromechanical transmission
A hydromechanical vehicle transmission system for an engine most efficiently operated at a single speed is disclosed providing an infinitely variable reduction ratio for a given constant input...
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3943715 |
Servo mechanism
A servo mechanism for a prime mover interconnected to a hydrostatic transmission includes a source of pressurized fluid, a fluid reservoir, an actuator having a piston operatively connected to the...
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3913325 |
Output split type hydrostatic transmission
A hydrostatic transmission comprises a hydraulically controlled speed differential means drivingly connected with an output shaft for transmitting the rotation torque of an input shaft to the...
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3842694 |
HYDROMECHANICAL TRANSMISSION AND CONTROL
An engine driven hydromechanical transmission and control having a hydrostatic portion and a step ratio gearing portion wherein the hydrostatic ratio and the gearing ratio are changed substantially...
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3650159 |
COMPOUND HYDROSTATIC TRANSMISSION
A compound hydrostatic transmission wherein a speed increaser transmission is added to a steering transmission, the steering transmission including end planetaries whose sun gears are driven by one...
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3545303 |
STEERING APPARATUS FOR TRANSMISSIONS COUPLED TO A FREE POWER TURBINE
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3545579 |
HYDRAULIC MOTOR WITH COUPLING CONTROL VALVE
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3496803 |
CONTROL APPARATUS FOR DOUBLE DIFFERENTIAL TRANSMISSIONS COUPLED TO A FREE POWER TURBINE
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3489036 |
HYDROMECHANICAL TRANSMISSION
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3465616 |
VEHICLE DRIVE
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3455184 |
TRANSMISSION
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