In the event of failure in a first assist system or a second assist system, a failure assist amount computing unit (35) computes an assist amount (Tf) while decreasing a maximum assist amount (upper limit for failure) as a limit value for when a vehicle is stopped compared with a maximum assist amount as a limit value for when the vehicle is running. For example, when it is determined that a failure, such as disconnection or switching element seizure, is present in the first assist system or the second assist system on the basis of a result of determination by a failure determine function, an assist amount switching unit (36) supplies the assist amount (Tf) inputted from the failure assist amount computing unit (35) to a first motor drive control unit (37) and a second motor drive control unit (38). When the failure is present in the second assist system, the drive control unit (37) drives an EPS motor (15) in accordance with the assist amount (Tf). When the failure is present in the first assist system, the drive control unit (38) drives the EPS motor (15) in accordance with the assist amount (Tf).
Vehicle electronic power steering device
2015-09-23
Patent
Elektronische Ressource
Englisch
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge |
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