| As the governments and society pays more and more attention to the environment and energy resources, the hybrid vehicle technology has entered an important stage, in which hybrid vehicle braking technology plays an important part on energy saving and environmental protection, so there are a lot of problems to be resolved. While recovering braking energy, not changing the traditional braking habit is especially important to the hybrid vehicle regenerative braking system design, but a traditional braking system can not allow the motor to exert the maximum capability. In order to keep the braking habit, new braking system and brake strategy need to be researched. Meanwhile, the regenerative braking will also affect the anti- lock brake control, so the integrative control strategy of regenerative braking force and hydraulic braking force is very important to ensure the safety of the emergency brake. In this paper, the study on the integrative control strategy of regenerative braking and hydraulic braking is essential and critical in a hybrid vehicle braking system.The main content is the control strategy of braking force distribution and the integrative control strategy of anti-lock braking control in HEV. The study contains four aspects as follows:1. First of all, to the structural characteristics of the HEV braking system, the hardware structure design of the hydraulic system and control system software design is studied in this paper.2. Because the hardware structure of the hydraulic system will not affect the braking feel when the hydraulic braking force is regulated during the braking process, based on the theory of braking force distribution, the control strategy of braking force distribution for the HEV regenerative braking system is studied: according to the degree of brake strength, the hydraulic braking force and regenerative braking force are controlled to ensure the motor to exert the maximum capacity. The braking force distribution can meet the ECE regulations and ensure the consistency and comfort for braking feel. Meanwhile, the effect of energy regenerating has been significantly improved.3. Refer to the related documents and the achievement of the research group, the anti-lock braking control logic based on the deceleration and slip rate of the wheels is designed in the paper for HEV according to the theory of the logic-threshold control method. And the integrative control logic of anti-lock braking strategy is designed when the regenerative braking force is performing. The integrative anti-lock braking system enables the regenerative braking force reduced to 0 at the fastest rate. Although the effect of energy regenerating is affected, the safety of the braking is greatly enhanced.4. In order to verify the control strategy of braking force distribution, in the ADVISOR software, the results for energy regenerating simulation were compared to verify the effect of energy regenerating through modifying the braking strategy module in the ADVISOR. In order to verify the integrative anti-lock control logic, in the Matlab/ Simulink and Stateflow software platform the HEV regenerative integrative braking control system model is built, the enforceability of the strategy is verified through choosing the primary threshold of braking strength and anti-lock logic threshold.The integrative control strategy of regenerative braking and hydraulic braking has certain innovativeness, and has the following meanings:1) Based on the modified hardware structure of the program, an innovative brakingforce distribution strategy is designed. By regulating the hydraulic braking force, the motor maximize the regenerative braking capability, which significantly increased the effect of energy regenerating. Meanwhile, the consistency and comfort for braking feel are ensured;2) While wheels tend to be locked in the braking process, the integrative control of regenerative braking force and hydraulic braking force can ensure maximum safety of the brake. |
PDF Full Text Request