Research And Software Development Of Vehicle Control Strategy For Pure Electric Micro-trucks

With the improvement of the economic level and the continuous development of the automobile industry,the global automobile ownership continues to increase.The automobile industry driven by traditional energy has caused serious environmental pollution and energy consumption,and the disaster caused by it is immeasurable.Therefore,it is necessary to vigorously develop new energy vehicles to alleviate the current environmental pollution and energy consumption caused by fuel vehicles.Pure electric vehicles have relatively low cost,no pollution,and low energy consumption,which play an important role in energy conservation and emission reduction.Based on a pure electric micro-truck project of a certain company,this project develops a pure electric vehicle controller which is based on vehicle parameters,component parameters and signals of input and output.The main work of the vehicle control strategy research and system software development is as follows:(1)Pure electric micro-truck adopt the motor drive axle combined drive form,complete the vehicle control system design with the vehicle parameters and control system structure,adopt CAN bus communication technology to build the whole vehicle communication network,confirm the control system input and output signals and Write the CAN bus communication protocol,and complete the design of the vehicle controller function module according to the requirements.(2)Study the vehicle driving control strategy of pure electric micro-truck,and divide the vehicle driving mode into eight working modes,focusing on the starting mode,power mode and economic mode.Before studying the driving mode,the median filtering method and the recursive averaging filtering method are used to realize the filtering of the accelerator pedal sensor signal to ensure the smooth output of the signal.The starting mode adopts the closed-loop control based on PI algorithm to realize the control of the start of the road and the start of the ramp.The power mode proposes a power mode control strategy based on the driver's intention to improve the acceleration.The economic model research accelerates the process of considering multi-objective optimization of acceleration performance and energy loss to improve vehicle economy.(3)Realize the software development of pure electric micro-truck controller,design the application layer software architecture,adopt the design method based on model development,develop application layer software in Simulink and Stateflow environment,including power-on and power-off program,gear management program,mode The hypervisor,driver control program,energy management program and accessory control program,etc.Automatically generate code using the Real-Time Workshop Embedded Coder tool and integrate with the underlying program in the S32 Design Studio environment.(4)In order to analyze the control effect of the vehicle control strategy,establish a pure electric micro-truck model,including longitudinal dynamic model,motor model,battery model.The hardware-in-the-loop test solution uses SCALEXIO,vehicle controller,host computer,and PC debugging software.The test results of the starting mode,the power mode and the economic mode under different driving conditions are analyzed.According to the test results,the control strategy has a certain degree of improvement on the vehicle dynamics and economy.