The present invention relates to a method and apparatus for detecting a misfire which may occur during the operation of an internal combustion engine, and which, in particular, not only detects a misfire, but also detects which cylinder of a multi-cylinder...

A misfire detection system monitors engine speed fluctuations in the engine rotation frequency domain and identifies misfire when a phase angle locks onto a stable value rather than fluctuating randomly. After misfire detection, the system also performs cy...

The invention particularly relates to method for determination of variation of engine speed based on interpolation of a trigonometric polynomial using a recursive formula. In one embodiment of the invention, a recursive method is not used. This method allo...

The engine has 4-stroke cylinders with controlled auto ignition and spark ignition. If misfiring occurs during controlled auto-ignition mode, the cylinder is re-ignited in spark ignition mode during the cycle following that misfiring. The cylinder is opera...

To establish the initial volume of fuel to be injected, as part of the fuel compensation control (MAR) for the fuel injection at an internal combustion motor where at least one fuel injector is controlled with an activating duration, a volume correction is...

A control system controls a spark-ignition internal combustion engine (11). The spark-ignition internal combustion engine (11) includes a cylinder (12), and a fuel injection valve (17) arranged in the cylinder (12); and an intake port (20) that communicate...

The revolution time (C') of a crankshaft rotor is detected based on the time (A) during which the pick-up (104) passes along the rotor at fixed angle range which is set based on the top dead center of rotor. The ignition timing is controlled based on the e...

An engine speed control that avoid undesirable transmission conditions such as clutch chattering. This is done by sensing actual conditions, which are likely to result in the undesirable transmission conditions such as clutch chattering and only changing t...

In a misfiring detection apparatus according to an embodiment, a comparison unit 22 and a time counting unit 24 accumulate periods of time during which the ion current flowing between the center electrode 10a and the ground electrode 10b of a spark plug 10...

A method is disclosed for detecting misfire or partial burn and for controlling spark retard in the cylinders of an internal combustion engine operated under the control of a microprocessor and utilizing signals indicative of the pressure in said cylinder ...