Matches 1 - 48 out of 48


Match Document Document Title
8601862 System and method for detecting misfire based on a firing pattern of an engine and engine torque  
A system according to the principles of the present disclosure includes a threshold determination module and a misfire detection module. The threshold determination module determines at least one...
8060275 Rough road detection system used in an on-board diagnostic system  
An on-board diagnostic system of a vehicle comprises disabling diagnostic operation, such as a misfire monitor, based on road roughness. In one example, the disabling of the diagnostic operation...
8026105 Quantification of lubricant reactivity using constant volume combustion device  
A method for identifying a lubricant composition that reduces the propensity for knock in an engine. The lubricant composition is mixed with a solvent to reduce the viscosity of the lubricant...
7712357 Method and system for rough road indications for misfire detection  
A method of operating an engine includes determining at least one characteristic of rough road performance based on at least one driveline characteristic and receiving crankshaft acceleration...
7591172 Method and system for misfire detection  
A method for determining a misfire condition includes receiving crankshaft acceleration data. The method further includes routing the received data through at least one of a plurality of...
7380444 Acceleration/deceleration detection device and method for four-cycle engines  
The engine acceleration detection device compares a intake manifold pressure at a certain crankshaft angle with the intake manifold pressure at 720 degrees before this crankshaft angle. If the...
7133761 Method and apparatus for controlling an internal combustion engine using accelerometers  
A method for processing an accelerometer data set generated from an operating internal combustion engine is disclosed. The processed accelerometer data is cepstrally filtered and a heat release...
7024303 Method for detecting misfiring in an internal combustion engine by analysing the angular acceleration of the drive shaft  
A method for detecting misfiring in an internal combustion engine by analysing the angular acceleration of the drive shaft, in which the value of the angular acceleration is estimated at...
6993427 Combustion state estimating apparatus for internal combustion engine  
A combustion state estimating apparatus for estimating the state of combustion in an internal combustion engine includes an angular acceleration calculator that calculates a crank angle...
6885932 Misfire detection in an internal combustion engine  
A method and system for a misfire detection acquires (301) a series of acceleration data (302) representative of acceleration behavior of an engine. The data is sampled (304) to obtain...
6847882 Misfire detection system and method of median filtering  
A processor having an embedded median filter routine, a method of median filtering using a vehicle's CPU, and a misfire detection system for an internal combustion engine with crankshaft...
6604410 Method and system to detect spark loss in a multiple spark plug per cylinder internal combustion engine  
The invention is a strategy to detect spark plug misfires in a multiple spark plug per cylinder internal combustion engine (ICE). The present invention monitors spark plug misfires for each plug...
6357287 System and method for detecting engine misfire using frequency analysis  
This invention provides a system and method for detecting misfires of an engine that reduces on board computer memory loss and shortens the time to process routines to detect misfires. Teeth are...
6324483 Angular acceleration transducer  
An angular acceleration transducer measures angular acceleration of a torque-transmitting shaft of a drive device, and includes a measuring shaft having a torque transducer and a transducer...
6212945 Method and apparatus for combustion quality diagnosis and control utilizing synthetic measures of combustion quality  
Disclosed is a method and apparatus for generating a synthetic measure of combustion quality which is particularly useful in diagnosing and controlling combustion quality in internal combustion...
5906652 Method and system for misfire determination using synchronous correction  
A method and system of misfire determination includes establishing an acceleration misfire threshold and an acceleration sub-misfire threshold. Then incremental engine position is sensed and a...
5862506 Modified trimmed mean filtering for misfire detection  
A modified trimmed mean filtering method and apparatus for a misfire detection includes acquiring a time-continuous series of acceleration data samples (601) representative of acceleration...
5841025 Misfire detection method and apparatus  
A misfire detection method and apparatus includes measurement of combustion induced torque in an internal combustion engine and provision of time-ordered first, second, and third acceleration data...
5808186 Method for detecting misfire by fluctuation in crankshaft rotation  
A method for detecting a misfire by fluctuation in crankshaft rotation in which the occurrence of a misfire can be detected exactly by eliminating the effect of detection error in detecting the...
5804711 Pattern recognition method and system for determining a misfire condition in a reciprocating engine  
A method, and a corresponding system, for determining misfire in a reciprocating engine measures engine crankshaft angular velocity and provides an angular velocity signal as measured from the...
5775299 Multiple cylinder engine control  
A control system and method for a multi-combustion chamber internal combustion engine. Balance running between the combustion chambers is achieved by varying the engine operating parameters or the...
5752213 Misfire detector with torsional oscillation filtering  
Irregularities in crankshaft velocity introduced when measuring crankshaft rotation at a section of a crankshaft in an internal combustion engine that is less damped to torsional oscillations than...
5732382 Method for identifying misfire events of an internal combustion engine  
A method for identifying engine combustion failure of an internal combustion engine having a plurality of cylinders, a crankshaft and a crankshaft position sensor includes the steps of operating...
5699253 Nonlinear dynamic transform for correction of crankshaft acceleration having torsional oscillations  
Irregularities in crankshaft velocity introduced when measuring crankshaft rotation at a section of a crankshaft in an internal combustion engine that is less damped to torsional oscillations than...
5687692 Combustion state determination method of internal combustion engine, as well as combustion state control method and combustion state control system for internal combustion engine  
A combustion control system for a lean-burn engine, to be mounted on an automotive vehicle, uses probabilistic and statistical nature of combustion variance upon lean-burn operation to obtain...
5616834 Misfire detection dependent on intake air charge fluctuations  
A misfire detection system and method measures fluctuations of air charge ingested into an engine 303, preferably as fluctuations of the engine's intake air pressure or as fluctuations of the mass...
5610328 Misfire detector for 50% misfire rate  
A misfire detector for an internal combustion engine obtains a baseline crankshaft acceleration value that degrades at a 50% misfire rate in a predetermined way that is capable of subsequent...
5571958 Apparatus and method for detecting misfire in an internal combustion engine  
A basic injection pulse width Tp which is representative of engine load is weightingly averaged, and a judgment value is set based on the weighted average value. The combustion pressure is...
5544058 Misfire detecting apparatus for a multi-cylinder internal combustion engine  
A microcomputer-based misfire detecting apparatus for a multi-cylinder internal combustion engine. A crank angle sensor is coupled to the engine for detecting first and second predetermined...
5542291 Misfire detection in an internal combustion engine using modified median averaging  
The invention estimates baseline acceleration expected from normal (i.e., non-misfiring) cylinders in an internal combustion engine even when the misfire rate reaches 50%. An offset median value...
5531108 Adaptive correction of torsional and wheel profile position irregularities for misfire detection  
A crankshaft based misfire detector for an internal combustion engine detects and identifies misfire over a broad range of engine operating conditions by establishing correction factors to...
5528931 Engine diagnostic monitor with on-board adjustment of correction factors  
A system and method compensates for systematic irregularities in measured engine velocities caused by torsional flexing in the crankshaft during rotation to improve the accuracy of misfire...
5515720 Acceleration based misfire detection system and method with improved signal fidelity  
An acceleration based misfire detection system with improved signal fidelity comprises a measurement device (421, 423, 425, 427) for determining an operating condition of the powertrain (401). The...
5509302 Misfire detection in internal combustion engines  
Internal combustion engine misfires are diagnosed through monitoring of change in engine speed wherein an acceleration spike index is generated for each cylinder event over a number of engine...
5508927 Apparatus and method for variable windowed peak detection in a misfire detection system  
An apparatus, and a corresponding method, for determining misfire in a reciprocating engine operates on a selectable quantity of discrete sampled acceleration signals that are indicative of...
5503007 Misfire detection method and apparatus therefor  
A method for detecting a misfire condition by interpreting acceleration of an engine crankshaft (301) is described. The method teaches measurement of a first engine crankshaft acceleration, (405)...
5497328 Device for detecting continuous misfires of a multi-cylinder internal combustion engine  
A misfire detection device for a multi-cylinder internal combustion engine detects levels of angular acceleration β of the crankshaft corresponding to predetermined phase intervals of respective...
5485374 Combustion-conditon diagnostic system and method for a multicylinder engine  
A system for accurately diagnosing the combustion condition of a multicylinder engine from the fluctuation of revolution speeds among individual cylinders in a wide range of engine revolution...
5452604 Misfire detection method based on fluctuation in crankshaft rotation  
A misfire detection method based on fluctuation in crankshaft rotation, in which a time interval required for the crankshaft to rotate over an angle region associated with a cylinder checked for...
5387253 Spectral misfire detection system and method therefor  
A system, and corresponding method, for detecting the presence of a misfire condition by interpreting spectral activity of a running engine includes a device (309, 313) for measuring a...
5365780 Misfire detection in internal combustion engine with overlapping power strokes  
Incorrect classifications of misfires (potential false alarms) are reduced by comparing the power loss value for a particular cylinder event with the power loss values for neighboring cylinder...
5337240 Misfiring sensing apparatus  
A misfiring sensing apparatus for an internal combustion engine measures the length of time required for two periods during the operation of an engine, each of the periods corresponding to a...
5331848 Misfiring detecting method and apparatus  
A method and apparatus capable of detecting the occurrence of misfiring in an internal combustion engine with high reliability over a wide engine operation range with a simplified structure....
5237862 Adaptive method of cylinder misfire detection in an internal combustion engine  
An adaptive method of detecting a misfiring cylinder in a spark-ignited internal combustion engine during substantially all engine operating conditions, including most no-load operation. The...
5216915 Misfire diagnosis apparatus for an internal combustion engine  
A misfire diagnosis apparatus for an internal combustion engine is shown including initial acceleration judging unit, delay unit, and a misfire judging unit. The initial acceleration judging unit...
5086741 Method and apparatus for detecting and controlling combustion condition in an internal combustion engine  
A method of detecting the condition of combustion in each cylinder of an internal combustion engine while monitoring a variation in rotation of a crankshaft in the engine for each cylinder, in...
4420968 Undesirable combustion characteristic detection apparatus  
A device for detecting undesirable combustion processes in internal combustion engines having spark-ignition systems, an acceleration sensor and a band-pass filter tuned to a frequency of a...
3972230 Detecting malfunction in cylinders of internal combustion engines  
An apparatus for, and method of, detecting the uneven operation of the individual cylinders in an internal combustion engine, and for diagnosing the cause thereof. The engine is operated at any...

Matches 1 - 48 out of 48