Regenerative braking is to improve the fuel economy of hybrid vehicles and increase the driving range is an important technology. Regenerative braking system is the original based on the hydraulic braking system to increase the motor brake, resulting in a regenerative braking, the three composite brake and hydraulic brake braking mode.According to the driver's braking intention, by judging the size of the brake strength, select the appropriate braking mode. Hybrid electric vehicle braking system includes several subsystems, as a switching system, during braking the brake mode and select the appropriate mode to switch between different braking when the stability of the switching system will follow the changes At the same time during braking is also involved in the switching of discrete event and continuous variables change, so this paper, hybrid system theory to study the hybrid electric vehicle regenerative braking system, the completion of the main research work: The basic theory of hybrid systems defined in the regeneration braking process of discrete event and continuous variables identified, and then described the vehicle regenerative braking system for the application of the theory of hybrid systems regenerative braking system provides a theoretical approach. Petri nets using differential braking process to establish three types of dynamic braking mode switching model. Petri nets based on the differential system better able to describe the differential changes in discrete changes and the advantages of establishing a uniform automobile hybrid regenerative braking system, dynamic model for the braking strength based on different switching modes of operation and reasonable modeling and simulation. Theory of switched systems is defined by the brake mode switching process, given the stability of the brake system, the definition of mode switching, and based on Lyapunov stability theorems proposed braking control law. By braking slip rate stability within a certain range to achieve a reasonable model of the brake control switch.
Key words: Hybrid cars, hybrid systems, regenerative braking, stability
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