公开(公告)号：US10605837B2

公开(公告)日：2020-03-31

申请号：US15902385

申请日：2018-02-22

Applicant: DENSO CORPORATION

Inventor： Kotaro Nakashima ,  Takashi Suzuki ,  Masaya Taki ,  Yohei Kaneda

IPC: G01R19/03 ,  G01R19/00 ,  G01R31/327 ,  G01R31/00 ,  G01R31/40

Abstract: An abnormality diagnosis apparatus performs: a first step of diagnosing a shortage of precharge voltage or a short-circuit failure between electrodes of a capacitor based on a detection value of a precharge voltage detection circuit in a state where a first relay and a second relay are turned off, and a precharge circuit is operated; a second step of diagnosing, after a normal determination in the first step, a disconnection failure of a precharge path based on the detection value of the precharge voltage detection circuit or a detection value of an inter-relay voltage detection circuit in a state where the first relay and the second relay are turned off, and the precharge circuit is not operated; and a relay failure diagnosis step of diagnosing, after a normal determination in the second step, a short-circuit failure and an open failure of the first relay or the second relay.

公开(公告)号：US20180238935A1

公开(公告)日：2018-08-23

申请号：US15902385

申请日：2018-02-22

Applicant: DENSO CORPORATION

Inventor： Kotaro Nakashima ,  Takashi Suzuki ,  Masaya Taki ,  Yohei Kaneda

IPC: G01R19/00

CPC classification number: G01R19/003 ,  G01R31/006 ,  G01R31/3278 ,  G01R31/40

Abstract: An abnormality diagnosis apparatus performs: a first step of diagnosing a shortage of precharge voltage or a short-circuit failure between electrodes of a capacitor based on a detection value of a precharge voltage detection circuit in a state where a first relay and a second relay are turned off, and a precharge circuit is operated;, a second step of diagnosing, after a normal determination in the first step, a disconnection failure of a precharge path based on the detection value of the precharge voltage detection circuit or a detection value of an inter-relay voltage detection circuit in a state where the first relay and the second relay are turned off, and the precharge circuit is not operated; and a relay failure diagnosis step of diagnosing, after a normal determination in the second step, a short-circuit failure and an open failure of the first relay or the second relay.