| EPS is a kind of power steering system following the system of hydraulic, EPS generally include torsion sensor , speed sensor , automatically controlled unit (controller ) , motor , clutch and moderating the organization. compared with the traditional steering system, EPS have outstanding performance characteristics. EPS is replacing the traditional hydraulic pressure steering system in the fields of the car and light-duty automobile.EPS is developed toward heavy car and commercial passenger train. EPS has already become one of the technology of research focus and front of automobile technical development of the world, and it has extensive application prospects. ECU is the key part in the EPS, The main function of the electronic control module is sending out the order and controling the movements of the motor and clutch after carrying on logic to analyse and calculate the torsion sensor signal and speed sensor signal. In addition, an electronic control module of ECU also has safe protection and diagnose the function oneself. ECU judges whether its system work state is normal through such signals as electric current , voltage of the generator , engine operating mode of gathering motor ,etc. Once system work is unusual , the power will be cancelled automatically, At the same time ECU will diagnose the trouble. ECU is usually one-chip computer system. There should be strong anti-interference ability in the control system, in order to adapt to the changeable environment of going of automobile. It should be correct fast to control algorithms , for meeting the demand for real-time control , For the more algorithms can realize ideal effectively. Standing on the existing technology of the system and electronic control module as the foundation with domestic and international electronic helping hand, This text has done research work to several following parts. 1.Have analysis existing EPS'S principle , type and key part and carried on systematic. 2.According to further investigation of EPS, use P87LPC768CPU as Key processor of electron control unit, Have carried on the detailed design to EPS, Have finished the control on direct current motor and collection of various kinds of sensor signals, at the same time got the warning function of security of the control unit. The hardware design of the electronics control unit primarily completed drive the control to the direct current motive,collected every kind of sensors'signals and control the safety of t he electronics control unit etc. Among them, The control of driving to the direct current motor utillized the function of PWM of the Single Chip Microcontroller, producing the variable empty ratio for PWM pulse a control to the electric circuit of motor The control electric circuit of the electric motor uses the H bridge electric circuit of four same N ditch a type MOS tube, having the good function with the higher and dependable.MOS The MOS tube driving utilized the grid integrated circuit IR2110, the slice is a kind of a passages, grids to drive, super-speed power in high pressure machine a dependable for of single a type gathering driving mold piece, increases driving electric circuit, adopt the exterior because of the last tube at the same time from raise the electric capacity last electricity, make drive the power supply number, lower the product cost. 3.Utilize the improved and classical position PID algorithms(Seperated PID algorithm) , The rings of closing of circuit and torsion realizing being exported to...
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