Mitsubishi Denki Kabushiki Kaisha

Ryoichi Hanazaki

Koji Nishimoto

Masaki Nakamichi

Takayuki Yano

Mitsuyasu Kunihiro

Satoshi Sawada

An engine control apparatus includes a valve operating mechanism for transmitting the rotation of a crankshaft to camshafts through a timing wrapping member. A control unit includes a phase detection section that detects the phase of a camshaft relative to the crankshaft, an abnormality determination section that makes, based on the detected phase, a determination whether the valve operating mechanism is abnormal, a threshold storage section that stores determination references as a lower limit threshold and an upper limit threshold, an initial phase storage section that stores, as an initial phase, a phase detected at the time of engine installation, and a phase correction section that corrects the phase detected during engine operation by using the initial phase thereby to calculate a corrected phase. The abnormality determination section outputs an abnormality determination signal when the corrected phase deviates from a determination reference range of from the lower to upper limit thresholds.

Engine control apparatus

Air-fuel ratio control apparatus for an engine of automobile for controlling an air-fuel ratio to a desired value includes module () for computing a purge ratio (Pr) from a purge quantity (QPRG) and an engine operation state, module () for computing a purge air concentration (Pn) from the purge ratio (Pr) and an air-fuel ratio feedback correcting coefficient (CFB), module () for computing a purge air concentration correcting coefficient (CPRG) from the purge ratio and the purge air concentration, module () for computing a fuel injection quantity (Qf) supplied to the engine () from the purge air concentration correcting coefficient, and module () for detecting an accelerating state of the automobile. The purge air concentration correcting coefficient is reset to an initial value when the purge air concentration correcting coefficient is not greater than a predetermined value (indicating leanness) and when the acceleration is detected.

Air-fuel ratio control apparatus for internal combustion engine

An O -sensor fault diagnosis apparatus and method therefor, which are capable of detecting wire breaking of an O -sensor with reliability and successively performing fault diagnosis with minimal effect on an exhaust gas. An O -sensor detects concentration of oxygen contained in an exhaust gas of an engine An ECU controls a quantity of fuel supplied to the engine through feedback control according to an output signal of the O -sensor. A fault diagnosis portion changes an input resistance value of an input circuit that is connected to the O -sensor and constitutes the ECU each time a control condition for determining that the O -sensor is in an inactive state is satisfied, determines that wire breaking occurs in the O -sensor only if the output voltage of the O -sensor exceeds a predetermined voltage, and activates an informing portion to send a notice showing that there is a fault in the O -sensor

O2-sensor fault diagnosis apparatus and method therefor

When operating area detecting device detects an operating area that has a predetermined rotation number of below, flame-cut determination selecting circuitry determines the flame-cut on the basis of the logical product between a detection result of first flame-cut detecting device and a detection result of second flame-cut detecting circuitry.

Flame-cut detecting device for internal combustion engine

To obtain a fault diagnostic apparatus of an evaporation purge system by which a fault detection of a purge vent valve can accurately be performed with no wrong judgment. There are included: a tank internal pressure detecting means for detecting an internal pressure of a fuel tank; a valve control means for controlling closing and opening of a purge control valve and the purge vent valve; a purge control valve fault detecting means for detecting a fault of the purge control valve on the basis of a detected output of the tank internal pressure detecting means when the purge control valve and the purge vent valve are closed; and a purge vent valve fault detecting means for detecting a fault of the purge vent valve on the basis of the detected output of the tank internal pressure detecting means when the purge control valve and the purge vent valve are open, and the purge vent valve fault detecting means performs the fault detection of the purge vent valve only when the purge control valve fault detecting means judges that the purge control valve is normal.

Fault diagnostic apparatus of evaporation purge system

A device for controlling the amount of the air taken in by an engine, for improving the starting performance of when the accelerator pedal is depressed from the idling state. The device comprises a throttle control means,A for operating a target throttle opening degree &thgr;o of a throttle valve,based on said throttle opening degree &thgr;, an accelerator opening degree &agr; and an idle signal D, and a throttle actuator,for opening and closing said throttle valve so that said throttle opening degree comes into agreement with said target throttle opening degree, wherein said throttle control means includes a means,for operating a first target throttle opening degree &thgr;o,based on said accelerator opening degree, a means,for operating a second target throttle opening degree &thgr;o,based on the idle signal, and a means,for operating a target throttle opening degree &thgr;o by adding up the first and second target throttle opening degrees together.

Device for controlling the amount of the air taken in by an engine

A device for controlling the vehicle to travel at a constant speed, which clearly distinguishes a downhill road over a flat road while the vehicle is traveling at a constant speed, and resets or resumes the overdrive position in order to stably maintain a vehicle speed at all times. The device comprises a downhill control means,for resetting the overdrive position of an automatic transmission,when the vehicle is traveling a downhill, wherein the downhill control means includes a downhill state detection means,for detecting the downhill state of the vehicle based on the throttle opening degree &thgr; and the vehicle speed Vs, and an overdrive reset means,for resetting the overdrive position of the automatic transmission in response to the downhill state, wherein the reset state of the overdrive position is maintained while the downhill state is being detected, and the throttle valve opening degree is used as a reference for judging that the overdrive is resumed from the state of being shifted down.

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Tokyo, Japan

Ryoichi Hanazaki