POWER STEERING DEVICE

PROBLEM TO BE SOLVED: To provide a power steering device for detecting an abnormal condition in a hydraulic control valve even while a vehicle is driven.SOLUTION: A control unit has a function as a determination unit, and estimates torque Ta generated in an electric motor on the basis of a drive cur...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	IZUMITANI YOSHIAKI, SAKAMAKI MASAHIKO
Format:	Patent
Sprache:	eng
Schlagworte:	LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS MOTOR VEHICLES PERFORMING OPERATIONS TRAILERS TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a power steering device for detecting an abnormal condition in a hydraulic control valve even while a vehicle is driven.SOLUTION: A control unit has a function as a determination unit, and estimates torque Ta generated in an electric motor on the basis of a drive current value Ia of the electric motor when a spool is shifted to a target rotation angle t. When a difference between the estimated torque Ta and a predetermined torque Tt is a predetermined value α or more, the control unit determines that the hydraulic control valve is in abnormal condition.