Economic Shift Strategy Optimization And Pulse And Gliding Energy Efficiency Analysis Of Passenger Vehicle

Facing the dual pressure of environmental pollution and shortage of energy,how to improve fuel economy and reduce fuel consumption is urgent problem.In this dissertation,taking the passenger vehicle that configures the double clutch transmission as the research object,the vehicle driving state and shifting strategy are optimized.Based on AVL Cruise software,the vehicle model is built and the corresponding parameter configuration is completed.The fuel consumption simulation calculation tasks of constant speed driving for 100 kilometers and NEDC cycle conditions are set to carry out fuel economy simulation analysis.Based on the AVL Cruise GSP Generation module,the fuel economy shift strategy is calculated.Based on the GSP Optimization module,the optimal design of the optimal economic shift strategy is realized.The simulation results of the optimized shift strategy are compared with the simulation results before verified that the optimized economic shift strategy reduces the fuel consumption of the vehicle and improves the energy utilization rate.In the process of optimization and characteristic analysis of vehicle driving state,the target speed cruise process is selected as the control group of pulse and gliding process.Based on the vehicle driving dynamics equation and energy balance relationship,the MATLAB software is used to simulate and analyze the pulse and gliding process of symmetrical reset and asymmetric reset speed regulation under different target cruising speed,acceleration and speed fluctuation amplitude.The characteristics of the energy-saving evaluation index of the vehicle with the change of the driving state and the cumulative energy saving in the pulse and gliding process are obtained.Based on the optimization results of economic shift strategy and driving state,the double optimization of shift strategy and driving state is carried out for NEDC cycle condition.The simulation results of NEDC cycle condition optimized by shift strategy,driving state,“shift strategy + driving state” and NEDC cycle condition are compared and analyzed.It is further verified that the economic shift strategy optimized by driving state greatly reduces energy consumption and improves energy utilization.Finally,the road test is used to verify the actual vehicle,and the cumulative energy consumption and its energy-saving effect in the pulse and gliding process are analyzed,and the test results are consistent with the simulation results.