Denso Corporation

Nippondenso Co., Ltd.

Taro Tabata

Masayasu Ushida

Hiroshi Ikeda

Yasuhito Takasu

Masahiro Yokoi

Hitoshi Tagami

During cylinder cut-off in which fuel injection for some cylinder(s) is halted, a variable valve operation mechanism or the halted cylinder is controlled based on an operating state of the engine whereby engine vibration is reduced during cylinder cut-off operation. The variable valve operation mechanism may be controlled based on a maximum internal pressure of a combustion cylinder in which fuel injection is continued during the cylinder cut-off operation.

Control apparatus for internal combustion engine

To suppress vehicle shock upon acceleration or deceleration, an upper guard value (KGUARD) for throttle rate of change is calculated based on parameters indicative of engine and torque transmission operating conditions. A target throttle sensor voltage change (DVVTA) is calculated based on accelerator depression and compared with the upper guard value KGUARD. If DVTTA&gt;KGUARD, the final target throttle sensor voltage for the present cycle is determined by adding the upper guard value KGUARD to the previously calculated final throttle sensor voltage. If DVVTA.ltoreq.KGUARD, the target throttle sensor voltage VTTA is used as the final target throttle sensor voltage.

Electronically-controlled throttle system

An apparatus for detecting a rough road running condition of a combustion engine car comprising means for calculating change values of an output rotational speed of the engine, means for calculating an instability of the measured change values, and means for judging the car to be on a rough road when the calculated instability is more than a predetermined amount.

Apparatus and method for detecting a road surface condition of a car

Apparatus for supplying high voltage to each spark plug of a multi-cylinder internal combustion engine via a spark coil includes a distributor plate of a unitary construction made of an electrically-insulative resin and having an integral base portion and an integral connector. A plurality of connecting lines are embedded in the base portion. One ends of the connecting lines are electrically connected respectively to spark coils whereas the other ends thereof extend to the connector. The distributor plate and the spark coils can be fixed, as a unit, to the internal combustion engine by a bracket of metal.

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Kuwana, Japan

Taro Tabata