外文翻译--液压助力转向系统(节选).pdfVIP

中文3000单词,2000单词，1万英文字符 本文来自于/cms/title_Electric-Power-Steering/A_110661/article.html Theconventionalhydraulica y-assistedpowersteeringusedinmostcarsissoontobe replaced with electric power steering. Already, many manufacturers are usingelectronica y contro edhydraulicsystems,whilesomecarmanufacturershaverecentlyintroducedpurely electric systems to their vehicles. In addition to reducing engine loads, fu electricpower steeringa owssteeringresponsivenesstobeautomatica yvarieddependingonspeed,road conditions - and even the driver'sability! Traditional Hydraulic Power-AssistedSteering Hydraulic Power Assisted Steering has been used in automotive applications for about50 years. The systems use an engine-driven hydraulic pump, a control valve, steeringcylinder andconnectinghydraulichoses.Thepumpisusua yofavanedesignwithanintegrated internalbypass.Itissizedsothat-evenatidlerpm-itdeliversenoughoilflowtoprovidea suitable degree of powerassistance. Thecontrolvalveusesaflexibletorque-measuringdevice(suchasatorsionbar,spiralspring orleafspring)toconvertthesteeringtorqueintoasma controlmovement.Thismovement istransferredtoavalvethatregulatesfluidflowtothepowerassistancemechanism.Inrack and pinion steering, a double-ended hydraulic ram mounted para e to the rack (withinthe rackassembly)isused,whilerecirculatingba systemsincorporatethemechanismintothe steering box. Note that in the Nissan system shown here, the fluid reservoir isincorporated into thepump. A major problem with simple conventional hydraulic steering systems is that theassistance levelisnotreducedathighspeeds,givingalackofsteeringfeel.AmericancarsoftheFifties andSixtieswereparticularlywe knownfortheirfeather-lightsteeringeffortduringparking, a characteristic which resulted in extreme vagueness at high speeds. To overcomethis problem,mostconventionalhydrau