An ECU obtains two data values (a peak value and a waveform correlation coefficient) that show the characteristics of a knock from the output of a knock sensor. The ECU approximately obtains the mean of each data value by smoothing each data value, and app...

When a fuel injection period and a knock determination period switch from a state in which they do not overlap to a state in which they do overlap, operational noise from a fuel injector rides on an output signal from a knock sensor during the knock determ...

Under engine operating conditions in which a default setting for a knock determination period overlaps with a fuel injection period during which fuel is injected by a fuel injector, the fuel injection timing and the knock determination period are set in co...

The values of the one or more variables (5, 6), such as the gain of measurement circuit for each cylinder are stored in the detection system. The output signal (1, 2) of the acceleration sensors that are provided with each cylinder, is maintained within th...

An apparatus for reducing a torque fluctuation of a lean burn combustion engine (1). An injector (11) supplies fuel to combustion chambers of the engine (1). An ignitor (10, 12) ignites the fuel supplied into the combustion chambers. A knock sensor detects...

The invention provides a preignition detection device that is capable of detecting a preignition condition (PI) in an incipient stage. Engine vibration is detected by a vibration sensor 113 and read into a controller 12. When the length of a period during ...

The arrangement has a current carrying conductor (2) directly mechanically coupled to a mechanical-electrical transducer (8) via an essentially incompressible medium. The transducer detects vibrations caused by the conductor and feeds the signal to an eval...