Research on a Novel Electro-Hydraulic Brake System and Pressure Control Strategy

2018 ◽  
Author(s):  
Haizhen Liu ◽  
Rui He ◽  
Weiwen Deng ◽  
Shun Yang ◽  
Jian Wu ◽  
...  
Keyword(s):  
Control Strategy ◽  
Pressure Control ◽  
Brake System ◽  
Hydraulic Brake

A novel pressure control strategy of an electro-hydraulic brake system via fusion of control signals

2019 ◽  
Vol 233 (13) ◽  
pp. 3342-3357 ◽  
Author(s):  
Wei Han ◽  
Lu Xiong ◽  
Zhuoping Yu
Keyword(s):  
Control Strategy ◽  
Sliding Mode ◽  
Pressure Control ◽  
Tracking Performance ◽  
Brake System ◽  
Automotive Application ◽  
Friction Compensation ◽  
Hydraulic Brake ◽  
Model Based ◽  
Control Signals

With the development of electro-hydraulic brake system in the automotive application, pressure control is at the top of a brake system engineer’s agenda. This work focuses on the development of a pressure-loop controller for a motor-type electro-hydraulic brake system, which is composed of an electro-mechanical actuator and a hydraulic link. The pressure control issue of motor-type electro-hydraulic brake system is influenced intensely by the nonlinearities (i.e. friction) and uncertainties (e.g. temperature variation, brake pad wear, and so on) of the system and by the very demanding performance specifications (i.e. supporting cooperative work with hydraulic control unit of anti-lock brake system). The pressure control of motor-type electro-hydraulic brake system is investigated, and a novel pressure–based control strategy via fusion of control signals is proposed to improve the pressure tracking performance. The control strategy comprises online model–based friction compensation, online dither–based friction compensation, and feedback control. Four original contributions make this work distinctive from the existing relevant literature. Selecting the Coulomb+viscous friction model can maximize to reduce difficulty of parameter identification and Stribeck effects detection based on maintaining the pressure tracking accuracy. Thanks to the model-based friction compensation torque, the signal magnitude of dither-based friction compensation torque can be decreased so that the vehicle comfort can be improved. The compensation parameters of both the model-based and dither-based friction compensation can be online modified according to the operating point of system. The robustness of the fusion controller is enhanced by employing the sliding mode control algorithm with conditional integrator. The performance of the proposed control strategy is evaluated by hardware-in-the-loop-simulation and vehicle experiment in typical braking situations. The experimental results with fusion control show improved pressure tracking performance in comparison with that without fusion control.

A control strategy for efficient slip ratio regulation of a pneumatic brake system for commercial vehicles

2021 ◽  
pp. 095440702110384
Author(s):  
Jayu Kim ◽  
Baeksoon Kwon ◽  
Youngnam Park ◽  
HyunJong Cho ◽  
Kyongsu Yi
Keyword(s):  
Control Strategy ◽  
Control Unit ◽  
Pressure Control ◽  
Torque Control ◽  
Brake System ◽  
Commercial Vehicles ◽  
Wheel Slip ◽  
Slip Ratio ◽  
Brake Pressure ◽  
Antilock Braking System

This paper presents a control strategy for efficient slip ratio regulation of a pneumatic brake system for commercial vehicles. A model-based estimator for brake pressure estimation has been developed. The braking torque applied to the wheel has been computed using the estimated brake pressure for the control of the wheel slip both in braking and traction situations. The vehicle velocity and wheel slip ratio estimation algorithms have been designed using only wheel speed sensors. The proposed slip regulation algorithm has also been successfully implemented for the antilock braking system (ABS) and traction control system (TCS). In ABS, the slip ratio and wheel acceleration are stabilized by a limit cycle control of the braking pressure. The TCS has been implemented by combining engine torque control and pneumatic brake pressure control. The brake controller is based on the valve switched control that incorporates the wheel dynamics and valve on/off characteristics. The ABS and TCS algorithms are integrated into the slip regulation algorithm to reduce the computation load of an Electrical Control Unit (ECU). Four-wheel independent slip monitoring and slip ratio control algorithms have been implemented on the ECU, and their performance has been investigated via both computer simulations and vehicle tests. Both results show that the proposed algorithms enhance the acceleration and braking performance without vehicle acceleration information. Moreover, the proposed split-mu strategy has improved the lateral stability during braking, and the acceleration performance during accelerating on the split-mu road. It has been shown via vehicle tests that, compared to the reference commercial algorithm, the braking distance was reduced by more than 4% on the split-mu and low-mu roads, and the acceleration performance was improved by 7.9% on the split-mu road.

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