This paper deals with energy-savings in a hydraulic power steering system by the reduction of the driving torque of a hydraulic pump in non-steering operation. In normal driving, steering operation is infrequent although the pump is continuously driven by the engine. Therefore, for energy-savings in power steering, it is effective to reduce the pump driving torque during non-steering operation. A reduction of the pump driving torque in non-steering operation is possible by decreasing the pump outlet flow rate regulated by a flow control valve. The study has investigated a prototype pump with an additional device: (1) to minimize the regulated flow rate under a non-steering condition; and (2) to restore the flow rate during steering operation. The mechanism is a kind of pressure reducing valve that changes the operation of the flow control valve in response to the pump outlet port pressure which is an indication of steering operation. As a result, the driving torque of this pump decreases to about 70% of that of the conventional pump in non-steering operation. (A) For the covering abstract of the conference see IRRD 875861.


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  • Accession Number: 00719824
  • Record Type: Publication
  • Source Agency: Institute for Road Safety Research, SWOV
  • ISBN: 1-56091-624-9
  • Files: ITRD
  • Created Date: Apr 26 1996 12:00AM