Hitachi Astemo Ltd.

Ryohichi Inada

Hideyuki Sakamoto

Teppei Hirotsu

Tatsuya Horiguchi

Yasuhiro Ishikawa

A three-phase/two-phase conversion unitgenerates a composite vector iof three-phase AC currents based on AC currents iu, iv, and iw. An electrical angle calculation unitoutputs the electrical angle of the composite vector iwith reference to the U-phase AC current iu. A quadrant calculation unitobtains which quadrant of the first to sixth quadrants partitioned in advance the acquired electrical angle corresponds to, confirms whether the composite vector ipasses through the set quadrant, and outputs quadrant information thereof. A failure detection unitdetermines whether the composite vector ihas rotated from the first quadrant to the sixth quadrant, and when there is a quadrant that has not been passed, considers that it is a failure state, specifies a failure part of the switching element from the relationship between the electrical angle and the failure part, and outputs failure information to a PWM signal generation unit

Power conversion apparatus and method for diagnosing failure of power conversion apparatus

An object of the present invention is to enhance the reliability of an autonomous driving system. The autonomous driving system includes: a higher-level control devicethat outputs a control target value of an actuator group based on an action plan of a vehicle; and a lower-level control devicethat controls the actuator group of the vehicle based on a command from the higher-level control device. The lower-level control deviceholds the control target value of the vehicle provided by the higher-level control deviceover a specific period. When the higher-level control devicedoes not satisfy a desired function, the lower-level control deviceis configured to be controlled based on the held control target value. The action plan is followed by determining and correcting a difference between an actual action value and the control target value of the vehicle.

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Tokyo, Japan

Ryohichi Inada