Hitachi Automotive Systems, Ltd.

Tomoaki Horii

Shingo Kimura

Ryo Kusakabe

Takaki Itaya

Mitsuru Nagase

Shirou Yamaoka

Kenji Takada

Kazuya Saito

Tei Ho

Provided is a device for controlling a fuel injection device capable of suppressing deterioration of exhaust performance while ensuring driving performance when acceleration of a vehicle is requested during an intake stroke. Therefore, when the acceleration of a vehicle is requested during an intake stroke in one combustion cycle, an engine control unitestimates an increase (acceleration intake air amount Qad) of the amount of air taken in a combustion chamberof an internal combustion engineassociated with the acceleration of the vehicle after the acceleration of the vehicle is requested in one combustion cycle based on a lift amount of an intake valve. The engine control unitcontrols a fuel injection valveso as to increase a fuel injection amount in one combustion cycle according to the acceleration intake air amount Qad.

Device for controlling fuel injection device

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.

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Hitachinaka, Japan

Tomoaki Horii