A Research For Brake Strategy Based On Fuzzy Control In Pure Electric Vehicles

Nowadays,the air pollution in cities and the energy crisis through the world have caused widespread concern.One of the major causes of the problems is the traditional vehicles.It's thankful that we have been committed to address these issues.The large-scale promotion and application of hybrid vehicles has eased the environmental and energy issues to a certain extent.But the problems do not solved fundamentally,and the effect is not particularly significant.The pure electric vehicles which are zero-emission and zero-pollution,can solve the problems caused by cars fundamentally.Pure electric vehicles and motor vehicles have the opposite performance,the pure electric vehicles have obvious advantages in terms of environmental protection and efficiency.However,due to the limits of economic and technological aspects,the current number increased rarely.The biggest limit is the short driving distance.The application of regenerative braking technology can extend the driving distance in some extent,and the fitness of the regenerative braking strategy is directly related to the key issues of safety driving braking and recovery efficiency.This article focuses on the braking strategy of pure electric vehicles.By understanding the composition and principle of regenerative braking system,the regenerative braking system model was built.According to the exiting major regenerative braking strategies,including ideal braking force distribution strategy,parallel braking force distribution strategy and max energy recovery strategy,we developed the strategy based on fuzzy logical theory.The inputs are brake intensity and vehicle velocity,and the output is the proportion coefficient of motor braking.The strategy was embedded into the software ADVISOR,and secondary developed the software.We chose different driving cycles to simulate the strategy.The result shows that,to be compared with the braking strategy exited,the strategy we proposed can significantly improve the remaining SOC of the battery,also the recycling efficiency of regenerative braking energy and total energy transfer efficiency.Thus,to some extent,we achieved the improvement of the driving distance of the pure electric vehicle.