This page has only limited features, please log in for full access.
The characteristics of electro-hydraulic braking systems have a direct influence on the fuel consumption, emissions, brake safety, and ride comfort of hybrid electric vehicles. In order to realize efficient energy recovery for ensuring braking safety and considering that the existing electro-hydraulic braking pressure control systems have control complexity disadvantages and functional limitations, this study considers the front and rear dual-motor-driven hybrid electric vehicle as the prototype and based on antilock brake system (ABS) hardware, proposes a new braking pressure coordinated control system with electro-hydraulic braking function and developed a corresponding control strategy in order to realize efficient energy recovery and ensure braking safety, while considering the disadvantages of control complexity and functional limitations of existing electro-hydraulic system. The system satisfies the pressure coordinated control requirements of conventional braking, regenerative braking, and ABS braking. The vehicle dynamics model based on braking control strategy and pressure coordinated control system is established, and thereafter, the performance simulation of the vehicle-based pressure coordinated control system under typical braking conditions is carried out to validate the performance of the proposed system and control strategy. The simulation results show that the braking energy recovery rates under three different conditions—variable braking intensity, constant braking intensity and integrated braking model—are 66%, 55% and 47%. The battery state of charge (SOC) recovery rates are 0.37%, 0.31% and 0.36%. This proves that the motor can recover the reduced energy of the vehicle during braking and provide an appropriate braking force. It realizes the ABS control function and has good dynamic response and braking pressure control accuracy. The simulation results illustrate the effectiveness and feasibility of the program which lays the foundation for further design and optimization of the new regenerative braking system.
Yang Yang; Guangzheng Li; Quanrang Zhang. A Pressure-Coordinated Control for Vehicle Electro-Hydraulic Braking Systems. Energies 2018, 11, 2336 .
AMA StyleYang Yang, Guangzheng Li, Quanrang Zhang. A Pressure-Coordinated Control for Vehicle Electro-Hydraulic Braking Systems. Energies. 2018; 11 (9):2336.
Chicago/Turabian StyleYang Yang; Guangzheng Li; Quanrang Zhang. 2018. "A Pressure-Coordinated Control for Vehicle Electro-Hydraulic Braking Systems." Energies 11, no. 9: 2336.
Hybrid vehicles usually have several braking systems, and braking mode switches are significant events during braking. It is difficult to coordinate torque fluctuations caused by mode switches because the dynamic characteristics of braking systems are different. In this study, a new type of plug-in hybrid vehicle is taken as the research object, and braking mode switches are divided into two types. The control strategy of type one is achieved by controlling the change rates of clutch hold-down and motor braking forces. The control strategy of type two is achieved by simultaneously changing the target braking torque during different mode switch stages and controlling the motor to participate in active coordination control. Finally, the torque coordination control strategy is modeled in MATLAB/Simulink, and the results show that the proposed control strategy has a good effect in reducing the braking torque fluctuation and vehicle shocks during braking mode switches.
Yang Yang; Chao Wang; Quanrang Zhang; Xiaolong He. Torque Coordination Control during Braking Mode Switch for a Plug-in Hybrid Electric Vehicle. Energies 2017, 10, 1684 .
AMA StyleYang Yang, Chao Wang, Quanrang Zhang, Xiaolong He. Torque Coordination Control during Braking Mode Switch for a Plug-in Hybrid Electric Vehicle. Energies. 2017; 10 (11):1684.
Chicago/Turabian StyleYang Yang; Chao Wang; Quanrang Zhang; Xiaolong He. 2017. "Torque Coordination Control during Braking Mode Switch for a Plug-in Hybrid Electric Vehicle." Energies 10, no. 11: 1684.