Electrically-driven power steering system having failure...

Details Electrically-driven power steering system having failure... Electrically-driven power steering system having failure...

H - Electricity

02

P

H02P 7/00 (2006.01) B62D 5/04 (2006.01)

Patent

CA 2355019

A CPU operates as an abnormality detection circuit for detecting an ON-state failure of FETs forming a motor drive circuit and a failure of terminals of the motor. The abnormality detection circuit inputs a motor supply voltage, a motor left-terminal voltage and a motor right-terminal voltage from a power supply voltage detection circuit, a motor left-terminal voltage detection circuit and a motor right-terminal voltage detection circuit, respectively. Then, the abnormality detection circuit determines the ON-state failure of the FETs and the failure of the terminals of the motor using the following detection logic in comparison with a predetermined threshold value V1: ¦motor supply voltage - motor right-terminal voltage - motor left-terminal voltage¦ > V1.

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