An Integrated-Electro-Hydraulic Brake System for Active Safety

Yu, Zhuoping; Xu, Songyun; Liu, Xiong; Han, Wei

doi:10.4271/2016-01-1640

Cited by 24 publications

(17 citation statements)

References 6 publications

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“…Its experimental results show that the actuator exhibits the typical stick-slip motion. The similar conclusion is also obtained in Yu et al 12 This stick-slip motion can be explained by the strong effect of friction.…”

Section: Friction Characterizationsupporting

confidence: 89%

“…Superior to the conventional vacuum booster, EHB can expedite the pressure response and improve the tracking accuracy, as the motor affects the pressure generation characteristics significantly. 12 The rotational dynamics of the motor can be expressed as follows…”

Section: System Modelingmentioning

confidence: 99%

“…This paper considers a decoupled EHB first presented in Yu et al: 12 an electric motor driven rotational-to-linear reducing mechanism that directly pushes the master cylinder to generate hydraulic pressure ( Figure 1). The power source of motion lies in the electric motor (direct current (DC) motor), which is connected to a fixed reduction gear to increase the output torque.…”

Section: Introductionmentioning

confidence: 99%

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

Han

Liu

2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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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.

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Section: Friction Characterizationsupporting

confidence: 89%

Section: System Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Han

Liu

2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…This paper considers a decoupled EHB first presented in Yu et al 22 : an electric motor driven reduction gear that directly impulses the master cylinder to generate the hydraulic pressure ( Figure 1). The pressure is delivered through the HCU of ABS and braking pipelines to the wheel cylinders.…”

Section: Plant Descriptionmentioning

confidence: 99%

Master cylinder pressure reduction logic for cooperative work between electro-hydraulic brake system and anti-lock braking system based on speed servo system

Liu

Han

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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As one feasible solution of brake-by-wire systems, electro-hydraulic brake system has been made available into production recently. Electro-hydraulic brake system must work cooperatively with the hydraulic control unit of anti-lock braking system. Due to the mechanical configuration involving electric motor + reduction gear, the electro-hydraulic brake system could be stiffer in contrast to a conventional vacuum booster. That is to say, higher pressure peaks and pressure oscillation could occur during an active anti-lock braking system control. Actually, however, electro-hydraulic brake system and anti-lock braking system are produced by different suppliers considering brake systems already in production. Limited signals and operations of anti-lock braking system could be provided to the supplier of electro-hydraulic brake system. In this work, a master cylinder pressure reduction logic is designed based on speed servo system for active pressure modulation of electro-hydraulic brake system under the anti-lock braking system–triggered situation. The pressure reduction logic comprises of model-based friction compensation, feedforward and double closed-loop feedback control. The pressure closed-loop is designed as the outer loop, and the motor rotation speed closed-loop is drawn into the inner loop of feedback control. The effectiveness of the proposed controller is validated by vehicle experiment in typical braking situations. The results show that the controller remains stable against parameter uncertainties in extreme condition such as low temperature and mismatch of friction model. In contrast to the previous methods, the comparison results display the improved dynamic cooperative performance of electro-hydraulic brake system and anti-lock braking system and robustness.

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“…Research on braking safety and braking energy recovery are two of the most important topics of braking system. The safety of the car should be considered firstly in the design of braking system, including fast speed reduction and maintain the stability of the braking direction [56], [57]. These specific requirements of the safety for braking force are to provide sufficient braking force on each wheel and to distribute the braking force appropriately.…”

Section: Control Strategy Of Brake-by-wire System: Braking Safetymentioning

confidence: 99%

A Survey of Brake-by-Wire System for Intelligent Connected Electric Vehicles

et al. 2020

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Intelligent connected electric vehicles (EVs) are widely considered as a trend in the global automotive industry to make transportation safer, cleaner and more comfortable. As an important component of intelligent connected EVs, the brake-by-wire (BBW) system is the key to determining the performance of the vehicle and the efficiency of braking energy recovery. BBW systems are showing great promise in the area of vehicle braking due to the increasing requirements on safety and energy efficiency of vehicles. In recent years, BBW systems have undergone great changes in terms of structure and control methods, not only increasing safety and energy recovery efficiency, but also integrating more functions. Although important advancements have been achieved in this field, these works have not been fully summarised. This paper surveys and summarizes the research in literature to bring topical information to the field of intelligent transportation systems. The objective of this study is to present an overview of both the development trend and key technologies of the BBW system for intelligent connected EVs. Firstly, the development, structure and core components of BBW system are described. Secondly, the control method and control strategy of BBW system are analyzed. As much as the system shows great promise, the problems existing on its current technology should be addressed as well. Finally, some important countermeasures are proposed to solve the existing technical problems of the BBW system.

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An Integrated-Electro-Hydraulic Brake System for Active Safety

Cited by 24 publications

References 6 publications

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

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

Master cylinder pressure reduction logic for cooperative work between electro-hydraulic brake system and anti-lock braking system based on speed servo system

A Survey of Brake-by-Wire System for Intelligent Connected Electric Vehicles

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