Mitsubishi Electric Corporation

Masaharu Yuhara

Michihiro Takata

Yuji Zushi

Takayuki Yano

Masahide Fujita

Tetsuo Maeda

Daisuke Yase

Even when, due to an abnormal decrease in the battery voltage, an engine control apparatus is inoperative, an engine can safely be started. Based on gearshift lever selection position information generated by a gearshift sensor (A), a first detection circuit () generates a first detection signal PSwhen the gearshift lever is in the neutral position or in the parking position; a microprocessor (A) is provided with a second detection means that generated a second detection signal PSwhen the gearshift lever is in the neutral position or in the parking position. Even when, due to an abnormal decrease in the voltage of a vehicle battery, the microprocessor (A) is inoperative, by ascertaining through the first detection signal PSthat the vehicle is in a state of not being driven, the engine can be started by means of a starting switch.

Engine control apparatus

The on-vehicle electronic control device includes a main power supply circuit fed with power from an on-vehicle battery through an output contact of a power supply relay and a main power supply terminal of a connector to supply a stabilized control voltage to a microprocessor. When contact failure occurs in the main power supply terminal, the main power supply circuit is fed with bypass power from the output contact through a first electrical load and a commutation diode to perform the one of the report of the abnormality and the storage of the abnormality occurrence history information. A bypass power fed state is detected when an input voltage to the main power supply circuit is lower than a power supply voltage of the on-vehicle battery.

Power supply abnormality detection circuit for on-vehicle electronic control device

Growing community of inventors

Chiyoda-ku, Japan

Masaharu Yuhara