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Electric Power Steering (EPS) in an electric car is needed to reduce the steering torque felt by the driver and to maintain good steering as a handling assist. With EPS, the driver needs only 2Nm to rotate the steering wheel in any condition. Electric power steering system consists of torque sensor, DC motor assist, current sensor, and an Electronic Control Unit (ECU). A classic proportional control...
The inertia, damp and friction force of machine are not conducive to the capacity of return-to-center in electric power steering system. In this paper the fuzzy logic control scheme based on angle absolute position for steer wheel return-to-center is proposed to improve the return ability of electric power steering system. The different resistive force is imposed on the steer column through the reducer...
This paper briefly describes the composition of electric power steering (EPS) system and the development advantages of brushless DC (BLDC) motor. Based on the mathematical model of the BLDC motor and the requirements of the EPS system for assist motor, a control strategy of the BLDC motor used in EPS system is proposed, then a simulation model of control system using in BLDC motor is set up, and its...
Because of the complex factors of the road random excitation, the torque sensor measurement noises and the interference caused by model errors in the electric power steering system(EPS), EPS controller must provide substantial robustness. In this paper, the mathematical model of EPS was established and the state-space expression with random interference signal was constructed, a control design method...
In this paper a new controller design method for Electric Power Steering (EPS) system with Variable Gear Transfer System (VGTS) is proposed. The control purpose is to achieve the desired steering gear ratio, the desired power assist with good steering feel and the desired feedback of reaction force from road surfaces to the driver. The basic idea of controller design is to apply decoupling control...
Electric power steering system (EPS) has been developing rapidly and becomes one of the safe-critical systems in modern control system of cars. The tracking performance of control system is an important factor that affects the assistance of electric power steering system. In order to improve the overall performance of electric power steering, fuzzy logic control theory was applied to the development...
Electric power steering (EPS) systems are rapidly replacing existing traditional hydraulic power steering systems due to fuel and cost savings. Methods to improve the reliability of a column mounted EPS are presented. This is accomplished by introducing a fault tolerant scheme for a torque sensor failure; that is, if the sensor signal is lost, this information can still be obtained and used to maintain...
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