Hitachi Automotive Systems, Ltd.

Shingo Kimura

Tomoaki Horii

Ryo Kusakabe

Takaki Itaya

Shirou Yamaoka

Mitsuru Nagase

Seiji Asano

Kunihiko Suzuki

Kenji Takada

Kenichi Kotabe

Kenji Mizushima

The objective of the present invention is to correct deviation in the injection amount and changes in the injection timing when the voltage of a high-voltage source for a drive device decreases. This drive device for a fuel injection device is equipped with a function whereby, when the pulse width of the injection pulse is set to an energization timethat closes a valve after a drive current has been switched to a maintenance current, the injection pulse width when the voltage of a high-voltage source has decreased is corrected so as to be longer than the injection pulse width when the voltage of the high-voltage source has not decreased, and, when the pulse width of the injection pulse is set to an energization time' that closes the valve before the drive current has been switched to the maintenance current, the absolute value of the amount of correction of the injection pulse width is made smaller than when the injection pulse width is set to the energization timethat closes the valve after the drive current has been switched to the maintenance current.

Drive device for fuel injection device

Provided is a knock detecting device capable of ensuring knock detection accuracy irrespective of fuel injection conditions even when a period during which injection-valve noise occurs overlaps with a knock determination period. An ECUsubjects signals output from a knock sensor, which detects vibrations of an internal combustion engine, to frequency analysis to calculate frequency components (). The ECUcalculates a background level that indicates the average of the frequency components (). The ECUstores, in association with each other, the number of fuel injections, which indicates the number of fuel injections in a predetermined time period during one combustion cycle, with a learning value, which indicates a frequency-component correction amount (). The ECUdetermines the presence or absence of a knock () on the basis of a knock index, which indicates the ratio of the difference between each frequency component and the learning value corresponding to the number of fuel injections, to the background level ().

Knock detecting device

Provided is a control device for an internal combustion engine, the control device enabling the suppression of variations in the amount of fuel injected by injection while the boost voltage is charging, without offsetting the injection timing. A boost circuit () boosts a first voltage supplied from a battery (), and supplies a boosted second voltage to a fuel injection device (). Switches () switch the second voltage supplied to the fuel injection device from the booster circuit on and off. Computation devices () control the switches. Each computation device comprises: an estimation unit that, before the initial fuel injection in a combustion cycle, estimates the second voltage for all of the fuel injection times in the combustion cycle; and a correction unit that corrects the amount of fuel injected for each fuel injection time depending on the estimated second voltage.

Control device for internal combustion engine

There is provided an engine control device which can accurately calculate a compensation coefficient used for transient compensation of an ignition timing without involving a complicated and large-scale calculation model in order to prevent a combustion deterioration and the like caused by a mechanical response delay and the like of the variable valve timing mechanism at a transition time such as an acceleration/deceleration time. The angular difference between each current real phase of the intake/exhaust valvesandand a target phase set based on an engine load equivalent amount such as an intake air amount is obtained; the shift amount or its correlation value between a current real intake air amount and a theoretical intake air amount value calculated using a pressure inside an intake manifold when each phase of the intake/exhaust valves has reached the target phase is obtained; further a compensation coefficient for matching the shift amount or its correlation value with the angular difference is obtained; and the compensation coefficient is used to perform transient compensation of an ignition timing.

Engine control device

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Hitachinaka, Japan

Shingo Kimura