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Simulation of Brake Energy Recovery System and Design of Controller for EV

Author: ZhaoXuan
Tutor: MaJian
School: Chang'an University
Course: Vehicle Engineering
Keywords: Electric vehicles Brake energy recovery Simulation Simulink Controller MC9S12DG128
CLC: U463.5
Type: Master's thesis
Year: 2010
Downloads: 702
Quote: 6
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Abstract


With the rapid development of the automobile industry, car ownership in the world rose rapidly. The negative impact of energy shortages, environmental pollution and climate warming cars is growing. Electric vehicles as a new energy vehicles, is the most effective way to solve the energy crisis and environmental pollution problems. Electric Vehicle mileage short, has become a major problem restricting the development of electric vehicles, to solve the driving range is the most direct way to increase the capacity of the battery, battery energy storage technology will not have a major breakthrough in the short term, electric vehicles continued The driving range of the increase was primarily rely on the improvement of energy utilization. The key breakthrough technology for electric vehicles energy utilization braking process how reasonable, efficient automotive mechanical energy into electrical energy stored in the energy storage element. The topics to pure electric car project \Electric vehicle braking process, the paper carried out the mechanical analysis, electric vehicle braking energy recovery constraints, the establishment of a dynamic model of the brake system, and the model is integrated into the Simulink environment simulation, which uses constant custom the current control strategy, using a PID controller to control the duty cycle of the DC / DC converter D under the brake motor armature current of the brake pedal opening angle has a good following. Experimental results show that: (1) when the demand braking force is less than the maximum braking force of the motor can provide all, electric vehicle braking force generated by the electric brake system. Under the premise to meet the braking safety and braking constraints, the brake, the greater the greater the braking force of the motor armature current the shorter the braking distance, the braking process the recovered energy is more. (2) is greater than the motor can provide maximum braking force when the braking force of demand, the electric vehicle braking force generated by the composite braking system. Composite brake when a large braking force, the braking distance is shorter, less braking energy recovered. Finally, this paper designed an electric car braking energy recovery controller, the controller based on Freescale MC9S12DG128 microcontroller controller consists of four modules: data acquisition module, display module, data communications module drive / brake control module, and design the hardware circuit and software program flow chart of the four modules. And the master controller, the power converter IGBT, the driving motor mechanical characteristics and a sensor in the electric vehicle test bench trials and testing. Of this research work has a certain practical significance for improving our level of research in the field of electric vehicles brake energy recovery.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Braking system
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