Hitachi Automotive Systems, Ltd.

Yasuhiko Okada

Yasushi Sugiyama

Takuya Mayuzumi

Kiyoomi Kadoya

Masahiro Toyohara

Koji Yuasa

Chihiro Sato

Ryosuke Ishida

Kenichi Hoshino

Shinichiro Yoneoka

In a vehicle control device in which a driver circuit which does not have a computing function and a computing device communicate with each other, there is provided a technology which can efficiently diagnose that both the driver circuit and the computing device normally communicate with each other by a simple technique. The vehicle control device according to the present invention transmits diagnosis data as a control command from a computing portion to the driver circuit, and the driver circuit sends inverted diagnosis data in which the diagnosis data is bit-inverted back to the computing portion. The computing portion diagnoses whether or not the communication between the computing portion and the driver circuit is normally performed, by using the diagnosis data and the inverted diagnosis data.

Vehicle control device

Disclosed is an electronic control unit capable of identifying an abnormality in a power supply voltage without narrowing the operating voltage range, and having minimal effects on cost and the circuit mounting surface area. The ECU includes a microcomputer containing an input terminal VCCin and an input terminal Vrin, a power supply IC that supplies a power supply voltage VCC to the input terminal VCCin, and as a reference-voltage-generator circuit a voltage-divider resistor and a voltage-divider resistor configuring a voltage-dividing circuit that outputs a sub-divided voltage Vc is sub-divided from the power supply voltage VCC, a capacitor coupled at one end to the input terminal Vrin and coupled on at the other end to ground, and a voltage isolation element coupled between the voltage-dividing circuit and the input terminal Vrin.

Electronic control unit

A reverse polarity protection circuit includes a p-channel MOSFET, an n-channel MOSFET, zener diodes, a coil that suppresses a backward flow of an electric current, a resistor that retains a voltage difference between a source of the p-channel MOSFET and a drain of the n-channel MOSFET, a resistor that protects the circuit if short-circuit destruction of the p-channel MOSFET occurs, a resistor that protects the circuit if short-circuit destruction of the n-channel MOSFET occurs, an electrolytic capacitor that suppresses fluctuation in an input voltage to a power supply control IC, a battery that supplies a voltage to an ECU, and the power supply control IC that generates a voltage for causing an IC in the ECU to operate.

Electronic control unit for automobile

Growing community of inventors

Hitachinaka, Japan

Yasuhiko Okada