【正文】 CAN) connected to the equipment [6]. Can easily and other system integration, unified coordination control. System work, sensor test driver39。 driver When steering system malfunction, EPS system does not support. Don39。t change the steering response characteristics are unable to control and transmission in the process of steering cannot with speed and lateral acceleration and other parameters of the changes, the pilot must pensate for car before in turn the steering response characteristics of certain operating pensation, such virtually increased the mental and physical burdens driver [2]. hydraulic steering system Hydraulic steering system (HPS) is the traditional mechanical steering system basis with a set of additional hydraulic booster, generally by oil pump, vshaped belt wheel, oil injection equipment, power devices and control valves etc. It with hydraulic oil pump is the power, through the movement to promote produced mechanical redirector work. Because the system through hydraulic works used to promote the traditional mechanical steering mechanism of steering movement so as to reduce the labor intensity, a driver in a certain extent, solve the traditional mechanical steering system caused because of transmission ratio fixed to light and sensitive the contradiction between. But, this kind of power steering system is driven by the steering wheel rotates the hydraulic system directly change torsion bar is the channel area to provide oiling the instrumentality of variable. Namely the discretion of size and speed boost have no relation with steering Angle, only concerned. Steering dish of greater perspective, turn the instrumentality of hydraulic systems provide is bigger also. Meanwhile, this system has the following weakness: (1) no matter car turn not to, as long as the engine and hydraulic motor drive ZhuLiBeng will work under the energy, the extra consumption engine. (2) the steering characteristics not adjusted, highspeed and same speed dynamical characteristics. In lowspeed steering need bigger boost, often for engine speed and low power poor effect, while in highspeed steering need smaller, will boost for engine speed high and power function big, bring about steering too sensitive, that the car manipulation stability bees poor. (3) the inherent hydraulic system of the hydraulic oil leakage problems and steering noise makes steering fort, meantime, dramatically reduced environmental pollution. Because of hydraulic steering system reliable work, mature technology, can provide the big steering and has been widely used. electrohydraulic power steering system Electrohydraulic power steering system at work steering characteristics can be changed. It basically has two kinds: electric hydraulic steering system (ECHPS) and electric hydraulic steering system (EHPS). Now automotive applications is the largest electric hydraulic booster turn from system. electronic control hydraulic power steering system Electric hydraulic steering system (ECHPS) in hydraulic steering system is based on the liquid flow rate increased control solenoid valves, torque sensor, the wheel speed sensors and steering control unit etc ponents. Ideally, car in spin to try to deft, request when in cars to different speed operation, which can realtime provide corresponding steering to overe the running speed to make drivers to resistance to manipulate the steering wheel can both lightweight, and have enough way feeling. In steering process, through the torque sensor, speed sensor etc sensing device will shift to rate, speed transfer to parameters such as steering control unit. After decoding, control by electromagnetic valve with liquid flow speed changing, and change the size of the moment, make grants to individual driver according to speed and driving conditions, changes to manipulate portability and stability to harmony. But at the same time, ECHPS also exist because of oil pump continuous work caused by excess energy consumption, the hydraulic system occupies a large space, easy to leak, noise big shortings, and increased its speed detection control device. And the control valve of structure than HPS plex and cost is higher, which are mainly applied in limousines and sports by using the car. electric hydraulic steering system Electric hydraulic steering system (EHPS) is in hydraulic steering system developed on the basis of. Its characteristic is driven by the engine turns ZhuLiBeng shifted the hydraulic motor drive, and increased its speed sensor, steering angular velocity sensor and steering control unit etc electricals. The system of hydraulic oil tank, oil pump, motors and steering control unit has integrated in motor oil pump in the group. Work steering control unit according to car of the speed and steering Angle calculated as the input signal output signal, control ideal appropriate power, motor output ZhuLiBeng driven hydraulic work. Through the hydraulic oil for steering gear provide power [3]. When the automobile lowspeed road, steering control unit control motor output large torque, make drivers can easily turned the steering wheel。雖然要趕上國(guó)際汽車的最高水平還有一段路要走，但將來(lái)在世界汽車技術(shù)尤其是汽車電動(dòng)轉(zhuǎn)向系統(tǒng)這一領(lǐng)域，我國(guó)必定占有一席之地。隨著未來(lái)汽車市場(chǎng)的快速發(fā)展和汽車電子價(jià)值含量的迅速提高，我國(guó)汽車電動(dòng)轉(zhuǎn)向系統(tǒng)將形成巨大經(jīng)濟(jì)規(guī)模效應(yīng)。（9）側(cè)滑符合要求。（7）橫、直拉桿不得拼焊。（5）汽車不得有擺振、路感不靈、跑偏或其他異?，F(xiàn)象。（3）轉(zhuǎn)向輪具有自動(dòng)回正能力。維修完成后的轉(zhuǎn)向系應(yīng)滿足：（1）不與其他部件發(fā)生干涉。此種轉(zhuǎn)向器的常見(jiàn)損壞是漏油和齒輪齒條間隙過(guò)大。④～； 安裝調(diào)整按拆卸的相反順序進(jìn)行；軟管連接處換用新的密封環(huán)；管接頭螺栓、支架固定螺栓、限壓閥螺塞等處的擰緊力矩嚴(yán)格按照制造商的要求；參照上述“轉(zhuǎn)向油更換”中的方法添加新的轉(zhuǎn)向油。②密封襯墊等經(jīng)過(guò)拆卸后應(yīng)更換新件。 檢修注意以下事項(xiàng)：①重點(diǎn)檢查限壓閥、流量限制閥和葉輪的磨損情況。⑤密封好從轉(zhuǎn)向器上取下的軟管，并對(duì)轉(zhuǎn)向器上露出的螺紋進(jìn)行保護(hù)。③拆下隔音板，將放液盤置于車下。 動(dòng)力轉(zhuǎn)向系的修理以寶來(lái)乘用車為例： 拆卸①拆下萬(wàn)向節(jié)，將萬(wàn)向節(jié)從轉(zhuǎn)向器中拉出。降下汽車前部，起動(dòng)發(fā)動(dòng)機(jī)怠速運(yùn)轉(zhuǎn)，滿打轉(zhuǎn)向盤2—3次。同時(shí)起動(dòng)發(fā)動(dòng)機(jī)怠速運(yùn)轉(zhuǎn)，左右轉(zhuǎn)動(dòng)轉(zhuǎn)向盤。圖35 轉(zhuǎn)向油泵傳動(dòng)帶張力的調(diào)整1—調(diào)整螺栓；2—鎖緊螺母圖36 齒輪齒條間隙的調(diào)整 轉(zhuǎn)向油更換①支起汽車前部，使兩前輪離開(kāi)地面。 測(cè)量轉(zhuǎn)向盤上的轉(zhuǎn)向力超過(guò)40N應(yīng)予以檢查維修，同時(shí)，轉(zhuǎn)向盤自由行程應(yīng)在規(guī)定范圍內(nèi)。圖33 系統(tǒng)壓力的檢查圖34 轉(zhuǎn)向泵壓力的檢查 檢查各連接油管、接頭檢查油管是否漏油，接頭連接是否牢固可靠。如圖34，起動(dòng)發(fā)動(dòng)機(jī)并怠速運(yùn)轉(zhuǎn)，滿方向轉(zhuǎn)動(dòng)轉(zhuǎn)向盤數(shù)次，將壓力表閥門關(guān)閉（不超過(guò)5s），～ Map。如圖33，打開(kāi)壓力表閥門，起動(dòng)發(fā)動(dòng)機(jī)并怠速運(yùn)轉(zhuǎn)，滿方向轉(zhuǎn)動(dòng)轉(zhuǎn)向盤數(shù)次，～ Map。②檢查油液是否有起泡或乳化現(xiàn)象。