Research Of Energy Management Strategy On A Three-axle Delivery Vehicle

The automobile has brought convenience to people's daily life,many problems are also brought about.The most prominent is the two problems: first,the oil resources in the foreseeable future will reach a state of exhaustion.Second,with the increase in the number of cars,a large number of exhaust emissions to the environment,causing pollution to the environment.As the carrier of human survival,the environment has been severely damaged in the rapid development of the automobile industry.The development of new energy vehicles has become one of the solutions to the problems of environmental pollution and energy supply.The research on hybrid electric vehicle(HEV)has become a hot topic in recent years.As an important transition to pure electric vehicles,hybrid electric vehicle has many advantages,although there is no concept of zero emissions,but its fuel consumption and pollution emissions compared with the traditional internal combustion engine was reduced significantly.The key technology of hybrid electric vehicle mainly includes three points:(1)Drive motor control technology(2)Vehicle energy management control system(3)Power battery management system.The energy management strategy distribute the torque output of engine and motor reasonably to improve the fuel economy of hybrid electric vehicle and reduce the exhaust emissions to meet the strict environmental regulations.In this paper,the simulation model is built in MATLAB/Simulink environment based on the three axis hybrid vehicle.Then according to the characteristics of plug-in hybrid electric vehicle,a rule based energy management strategy is designed.The fuel consumption of the vehicle is reduced by 8.5% and the fuel economy is improved.In order to improve the ride comfort of the vehicle during the process of model switching,the dynamic coordination control of the torque in the process of model switching is carried out.Finally,the energy management strategy is verified by real vehicle test.1.The construction of the model of three axis hybrid vehicle.Firstly,the construction method of the model is analyzed.According to the main content of this paper,the backward simulation model building method is selected.Then according to the needs of this paper,we select the appropriate method to deduce the mathematical model of each part,and build the vehicle simulation model based on the MATLAB/Simulink environment.Finally,the model is verified in the ECE cycle.2.Energy management strategy design of three axis hybrid vehicle.Firstly,combining with the characteristics of the plug-in hybrid vehicle,the vehicle driving mode is divided based on the static efficiency diagram of the engine and the drive motor.Then,according to the specific use of the three axis hybrid vehicle,the specific control of the energy management strategy in each mode is designed.Finally,a simulation model of energy management strategy is built in MATLAB/Simulink environment.3.Design of dynamic coordinated control strategy for mode switching.Firstly,the paper analyzes the vehicle driving performance of the non-mode switching torque coordinated control.According to the simulation results,it is proved that it is necessary to control the torque in the process of switching mode.Then,the paper designs the overall solution of the dynamic coordination of the mode switching.4.Vehicle energy management strategy vehicle test verification.First of all,the vehicle controller is selected according to the number and type of signal involved in the energy management strategy.Then the energy management strategy for the controller is assigned.The model is download to controller through the Me Ca.In the end,the test scheme of three axle hybrid vehicle is designed.The results of real vehicle test are analyzed,and the conclusion is drawn that the rule based hybrid energy management strategy can meet the design requirements.