Hitachi Astemo Ltd.

Kotaro Oki

Osamu Mukaihara

Toshihiro Aono

Kenichiro Tokuo

Akiyasu Miyamoto

Shunsuke Aritomi

Fumihiro Itaba

Akira Iizuka

Hirotaka Nakai

A rotation speed or a rotation time of a crankshaft at a certain angle is calculated on a basis of a change in a detection signal of a sensor of the crankshaft. Then, when a combustion cylinder is switched, information on the rotation speed or the rotation time for at least two combustion cycles is obtained, and a combustion phase is calculated on the basis of the rotation speed or the rotation time. Accordingly, by using the that measures rotation of the crankshaft, it becomes possible to detect a combustion state of the internal combustion engine with high accuracy.

Electronic control device and combustion state detection system

To provide a control device capable of calculating a cam phase equal to an actual cam angle even when a corresponding cam angle signal detection range is exceeded by changing a cam phase by a variable valve mechanism. In addition to the conventional cam angle measuring function, a cam angle measuring means for advancing or retarding beyond a cam angle measurement reference position, and a means for determining that the cam angle signal advances or retards beyond the cam angle measurement reference position are provided. By switching the cam angle measuring function according to a determination result as to whether the cam angle signal exceeds the cam angle measurement reference position, it is possible to improve the time resolution of the angle measurement while maintaining the cam phase change amount at the same wide angle as the conventional one.

Control device

Low noise control of a high-pressure fuel pump is performed by reducing noise generated by an anchor colliding with a fixing core. A control devicefor a high-pressure fuel pump controls a suction valve that opens and closes an inflow port through which fuel flows to a pressurizing chamber by performing energization to a solenoidin synchronization with a reciprocating motion of a plunger. A current energized to the solenoidincludes a peak current for giving a force to start closing a valve to the suction valve in a stationary state and a holding current for performing switching in a range smaller a maximum value of the peak current in order to hold the suction valve in a valve closing state. When the control devicereduces a peak current application amount of the peak current from a value sufficient to close the high-pressure fuel pump, a valve closing speed of the suction valve becomes small up to a certain application amount, and when the peak current application amount becomes smaller than the application amount, there is a saturation range of a current application amount of the peak current in which the valve closing speed of the suction valve is saturated. The control devicecontrols the current application amount of the peak current to fall in the saturation range.

Control device for high-pressure fuel pump

Provided is a technique for identifying a variation in an injection amount by estimating a valve opening start timing in an extremely small injection region of a half lift region. Therefore, a fuel injection control device according to the present invention estimates a valve opening start timing of a fuel injection valve by referring to a characteristic of a reference fuel injection valve acquired in advance.

Fuel injection control device

The present invention provides a fuel injection control apparatus that can suppress variations in fuel injection amounts in a very small fuel injection region. For this purpose, the fuel injection control apparatus includes a fixed injection pulse generatorand a drive current interruption unit. The fixed injection pulse generatorgenerates a fixed injection pulse having a valve opening timing at which a drive current is supplied to an electromagnetic coilin an electromagnetic fuel injection valveand a first valve closing timing at which the drive current to the electromagnetic coilis interrupted. Within a period in which the fixed injection pulse is generated, the drive current interruption unitdetermines an electric energy amount of a drive current supplied to the electromagnetic coil in response to a valve opening timing of the fixed injection pulse. When this electric energy amount reaches a preset, predetermined target electrical energy amount, the drive current interruption unit generates a second valve closing timing of the fixed injection pulse different from the first valve closing timing and then interrupts the drive current supplied to the electromagnetic coil before the first valve closing timing.

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Hitachinaka, Japan

Kotaro Oki