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For active steering vehicle, a proper steering ratio is important to the driver's handling stability. This paper focuses on variable steering ratio. Based on the structure of double planet gear set, the relationship of steering wheel angle and motor angle is described, and the kinematic model of front wheel's additional angle is established. In order to overcome the large steering workload in low...
A novel electric power steering system (EPS) integrated with active front steering (AFS) is developed. It has functions of both AFS system and EPS system with two actuator units: the AFS actuator unit and the EPS actuator unit. The AFS actuator unit controls the displacement transfer behavior of the steering system, and improves the handling stability under adverse road conditions by varying the steering...
The system structure and working principle is described briefly which integrate the active front steering (AFS) system and electric power steering (EPS) system. According to the principle and the necessary simplification of the integrated system, the integrated system mathematic model was given. To study the impact of variable gear ratio (VGR) on active damping control of EPS, the matlab simulation...
In this paper, we propose a yaw moment control based on fuzzy-logic controller to enhance the vehicle stability. A two-degree-of-freedom nonlinear model of the considered vehicle is briefly presented. The feedback of the yaw rate and sideslip angle are regarded as inputs of the controller. The developed controller generates the suitable steering angle so that the vehicle follows the target values...
To enhance yaw stability of the vehicle with Active Front Steering System, a vehicle two-degree-of-freedom simple model is set up. The feedback of the yaw rate is regarded as an input; we propose a yaw moment control based on fractional-order PID controller, and parameters in-line setting in the process of control is realized. The developed controller generates the suitable yaw moment so that the...
This work presents an optimum approach to design PI controllers of permanent magnetic brushless DC motor (PBLDCM) to solve the traditional shortcomings of the existing PI algorithm. The primary design goal is to optimize the transient response by minimizing the maximum overshoot, settling time, rise time of step response. This study proposes a non-liner PI controller based on ant colony system (ACS)...
According to the operating mode of pure electric power bus, the recirculating ball-type EPS (Electric Power Steering System) is designed and its dynamic model is established by the optimum design. Because of the existence of system uncertainty model, disturbance signals, sensor noises and the demand of system dynamic performance, the mixed H∞/H2 controller is designed for the EPS. The simulation results...
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