专利内容由知识产权出版社提供
专利名称：Control system for a hydraulic circuit of a
vehicle
发明人：Adams, Frederick John申请号：EP85305386.6申请日：19850729公开号：EP0184284B1公开日：190524
摘要：(D A vehicle control system has a system part (5) with a pump (6) feeding anopen centre valve (4) which controls power assistance for vehicle steering. A secondsystem part (11) has a pump (16) feeding an accumulator (13) and a closed centre valve(10) which controls operation of a clutch or brake booster (2). The pumps (6) and (16) aresimultaneously driven by a motor (18). A by-pass valve (21) in conduit (20) is responsivethrough a pressure transducer (22) and an electrical control unit (19) to pressure in theaccumulator (13) so that when the accumulator pressure attains a predetermined valuethe by-pass valve (21) opens communication between the output from pump (16) and areservoir (7) to relieve the load on the motor (18). A pressure regulating valve (23) isprovided in the steering system part (5). The valve (23) is responsive to pressure from theoutput of the second pump (16) through conduit (28) and permits the output from thepump (6) to flow by way of conduits (24) and (9) to the reservoir (7) when the pressurefrom the pump (16) attains a predetermined value so that the pressure available to thevalve (4) is less than the maximum pressure available from the output of the pump (6)and the load on the motor (18) which is attributable to it driving the pump (6) is relieved.The valve (23) is preferably a spring loaded spool valve displaceable by expansion of a
chamber through the admission of fluid from conduit (28).
申请人：TRW CAM GEARS LIMITED
代理机构：Walters, Frederick James
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