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1. (WO2018081371) APPARATUS AND METHOD FOR TURNING STEERABLE VEHICLE WHEELS

Pub. No.:    WO/2018/081371    International Application No.:    PCT/US2017/058456
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Fri Oct 27 01:59:59 CEST 2017
IPC: B62D 5/065
B62D 5/06
B62D 5/08
B62D 6/00
B62D 101/00
B62D 117/00
Applicants: TRW AUTOMOTIVE US LLC
Inventors: HARTER, JR., Joseph E.
Title: APPARATUS AND METHOD FOR TURNING STEERABLE VEHICLE WHEELS
Abstract:
A method for turning steerable wheels of a vehicle includes supplying fluid under pressure to a hydraulic power steering motor with a pump driven by an engine of the vehicle to turn the steerable wheels during operation of the engine. It is determined if the engine of the vehicle is shut down. An electric motor applies power assist to turn the steerable wheels when the engine is shut down. An apparatus for turning steerable vehicle wheels includes a hydraulic power steering motor assembly connected with the steerable vehicle wheels. A pump connected with the power steering motor assembly is driven by an engine of the vehicle to supply fluid under pressure to the power steering motor assembly during operation of the engine. An electric motor connected with the steerable vehicle wheels applies power assist to turn the steerable vehicle wheels. A controller operates the electric motor to apply the power assist when the engine is shut down.