Denso Corporation

Aisin Seiki Kabushiki Kaisha

Advics Co., Ltd.

Shinichi Shimono

Yoshimichi Hara

Takao Tsunooka

Masao Suzuki

Kazuhiro Imoto

Risa Ito

An abnormality monitoring circuit of an ECU includes a microcomputer, a reset circuit that resets the microcomputer, a monitor circuit that monitors the operation of the microcomputer, and an output circuit that activates an external actuator. The monitor circuit has an abnormality decision signal output section that outputs an abnormality decision signal to the output circuit when not being able to confirm that an output of a normal monitor signal of the microcomputer has occurred within an abnormality decision time. The monitor circuit has a reset decision signal output section that outputs a reset decision signal to the reset circuit when not being able to confirm that an output of the normal monitor signal of the microcomputer has occurred within a BIST (Built In Self Test) completion time of the microcomputer and a reset decision time set to a time longer than the abnormality decision time.

Circuit for monitoring abnormality of ECU

The invention is directed to an electromagnetic valve unit, which includes a housing for defining therein a first chamber and a second chamber separated by a wall member having at least a communication hole, and a plurality of electromagnetic valves each having at least a terminal. At least a part of each electromagnetic valve is mounted in the first chamber. A circuit board for mounting thereon an electronic control element for controlling the electromagnetic valves is mounted in the second chamber. The valve unit further includes a conductive member, one end portion of which is connected with each terminal of the electromagnetic valves, and the other end portion of which is connected with the circuit board through the communication hole of the wall member. And, a seal member such as a resilient grommet is provided for holding the conductive member in the communication hole of the wall member to provide a seal therebetween. Each of the electromagnetic valves may be provided with a valve portion and a solenoid coil portion which is separable from the valve portion and which has the terminal connected with the conductive member.

Electromagnetic valve unit

Growing community of inventors

Anjo, Japan

Shinichi Shimono