Mitsubishi Electric Corporation

Yasushi Takemoto

Yuji Takatsuka

Susumu Zeniya

Kazushi Kimura

Seiichi Imaizumi

Shinji Kunisada

A shortening of an initial diagnosis time is achieved, even after an elapse of a predetermined delay time from an ignition switch being switched to an off-state. After the ignition switch is switched to an off-state after an operation of a control device, which drives an electric motor that applies steering assistance force to a steering system, diagnosis of a power supply circuit that supplies power to the control device is carried out, and a diagnosis item to be implemented in a succeeding initial diagnosis is determined based on a result of the diagnosis.

Electric power steering device

A electric power steering control device equipped with a motor having a resolver detection unit includes: an ambient temperature detector for detecting ambient temperature around a portion generating heat by current flow; a motor temperature detector for, based on a signal from the resolver detection unit of the motor, estimating the temperature of the portion generating heat; and an abnormality determiner for comparing the temperature detected by the ambient temperature detector with the temperature detected by the motor temperature detector and determining that the ambient temperature detector is abnormal.

Electric power steering control device

An engine is operated with air-fuel ratio F/B control interrupted, by regarding an alcohol concentration value ALCinputted from outside as a tentative concentration value, and by detecting the rotation-speed fluctuation amount of an engine, the appropriateness of the tentative concentration value is determined. In the case where it is determined that the tentative concentration value is appropriate, an estimated alcohol concentration value ALCstored in a storage means is replaced by the tentatively changed alcohol concentration value ALC

Growing community of inventors

Kobe, Japan

Yasushi Takemoto