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1、附 录A 外文文献Overview ofDevelopment on Vehicle EPS System AbstractThe currentdevelopment of an electric power steering(EPS) system in an automobile is explicated. The structure, types and characteristics of electric power steering system are introduced. The modeling technologies for electric power steer
2、ing system and control strategies are analyzed and compared. The development trend of electric power steering system in an automobile is also discussed. It is pointed that the electric power steering technology is one orientation ofpower steering technologies in the future, and whichwill occupy a pr
3、edominantposition in power steering field.Key words:Automobile; Electric power steering system; Development trend1 EPS system types and characteristics1.1 EPS system classificationThe early development of EPS system is low in steering type car。Present 4 types of EPS system are based on rack-and pini
4、on steering system,The installation position according to power motors can be divided into different:Type booster steering、Small gear power type、Double small gear power type and Rack power type。The steering the instrumentality of motor power type EPS installed in the steering,Motor power torque thro
5、ugh increased after worm worm gear deceleration in the steering directly added twist。Its advantage is motor can be installed in any position hacking,Relative to other several types minimum cost;The drawback to motor torque ripple effects of driver feel bigger。The drawback to motor torque ripple effe
6、cts of driver feel bigger,The instrumentality of torque motor added in small gear axle directly。Advantage: rigid, steering road to feel strong。Double pinion steering rack boosts type EPS are installed on two small gear, A small gear and steering plate connected, power motors through another pinion a
7、nd rack meshing, provide power for rack. Advantage: can provide relatively large pow.1.2 EPS system merit EPS system and the traditional hydraulic power steering system has the following advantages compared（1)EPS in various riding condition can provides the best efforts。In the car or parking at Trea
8、sury and low-speed steering provide enough power for the driver，In high-speed steering made drivers have good road feeling，And reduce caused by pavement of rough disturbance of steering system，Improving auto steering characteristics。（2）Improve the car fuel economy，Urban conditions can improve fuel e
9、conomy. (3) the average 5%, saving fuel 3. EPS system only when the vehicle steering only provide power, Unlike traditional hydraulic power steering system even in dont turn,Pumps have been running.（3）EPS system structure is compact, parts, convenient in installation and smaller number to assemble,
10、enhanced the labor productivity due to tell the packed in engine pulleys and oil pump, set aside of the space can be used to install other parts of FIAT Punto production company adopted DELPHI company developed the electric power steering system, loading time reduced around 80 percent.（4）EPS system
11、cancelled hydraulic loop, there is no oil leakage and oil leakage problem, reduce the pollution to the environment, and save a lot of steering oil.（5）EPS system has the function of self diagnosis, convenient in maintenance and maintenance.（6） EPS system has good low temperature performance, even in
12、40 environment, EPS system also can work very well, has higher reliability and safety.（7） EPS systems biggest advantage is the performance of the whole system can not changing the system structure of the cases, by changing the system control strategy of programming realize, in order to meet differen
13、t models and different driving feel the need, greatly reduced the development cost and improve the efficiency of development.2 EPS System Key Components EPS system key components Angle sensor are mainly torque sensor speed preach2.1 Corner Sorque SensorSensors for real-time detection of steering Ang
14、le rotation direction and steering disk disk position，The torque sensor for real-time detection steering dish torque size，And will signal transmission to EPS system of electronic control unit (ECU)。Corner the torque sensor precision problem decided the electric power steering system performance and
15、reliability，Accelerate development research performance reliable, low-cost corner torque sensor is very important，The cost of the sensor is restricted by the electric power steering system one of the main factors market.2.2 Speed SensorThe wheel speed sensors used to measure the size of the average
16、speed speed sensor using electromagnetic induction sensor installation on the sensor in gearbox according to the change, the main speed pulse vice two system signals to ECU, because this was two system, therefore the signal reliability improved2.3 Power MotorsPower motors is EPS system actuators, and help motor characteristics directly affect the EPS system to control the ease or drivers handle EPS system for pow
