Control Strategy For Electric Power Steering And Testing Research

With the rapid development of automobile manufacturing, automobile drivingskills is becoming increasingly popular, modern vehicle technology is also developingrapidly, the driver has gradually increased the safety requirements of vehicle steeringoperating system. In recent years, a new steering system–electric power steeringsystem (EPS) is gradually developed, and its main characteristic is energy saving,environmental protection, operation stability. The system’s working process is sensorreceiving all kinds of signals to the electronic control unit, and electronic control unitto determine the appropriate torque according to the signal, and then running throughthe motor drive circuit, thereby it is achieved electric power steering. The electricpower steering system is gradually replacing the hydraulic power steering system. Asthe domestic automotive industry is less advanced than the international automotiveindustry, and industrial research in the EPS is very slow in domestic, so speed up theEPS design and development has an important significance on the development ofdomestic automotive parts industry.The paper analyzes the structure and working principle of electric power steeringsystem, while describe the detailed discussion with the main components of thesystem. In order to make the system to meet the driver at the steering controlportability, road feel, good stability, etc., to develop the four control strategies: powercontrol, return control, damping control and compensation control. In addition, thispaper write the further study of the PID control, linear quadratic optional control,robust control, fuzzy control and artificial neural network control method.The paper on the hardware design of electric power control system including thechoice of electronic control units, sensor signal processing circuit design, motor drivecircuit design, relay control circuit design, hardware failure-driven anti-interference circuit design. Software design and hardware design are complementary, the systemcontrol methods and control strategies are implemented through software design. Thepaper design electric power steering system software programs and major programworkflow.Bench test play an important role in theoretical study and simulation play of theelectric power steering system, the data is to develop the prerequisite and basis forEPS products. Real car tests need to consume a large amount of manpower, materialand financial resources, using the bench to get some basic parameters and algorithms,test follow-up to a real car is very beneficial, not only can shorten the test anddevelopment cycles, but also reduce direct loading risk of a real car road tests andresearch costs. Finally, this paper describes the electric power steering system benchtest requirements and test methods, and design of EPS test bed. Testing steeringfeature, return properties, damping characteristics and reliability of the test throughthe test bed. The test results meet the electric power steering system designrequirements.