| Hybrid electric vehicle (HEV) has both advantages of the electric car and traditional internal combustion engine vehicle, which is a practical program to solve environmental pollution and energy problems. It has very important strategic and practical significance to carry out research on HEV.In this paper, based on comprehensive analysis of technologies related to the hybrid electric vehicle, Chery A3 as the prototype vehicle is converted into Series-parallel hybrid electric vehicle (PSHEV). Some problems during the conversion process are analyzed, main work and results achieved are as follows:(1) Based on analysis of PSHEV principle, six kinds of connection programs for power distribution mechanism are proposed, among which the optimal one is obtained through calculation and comparison. For the selected program, parameters of power combination are determined and three-dimensional assembly is completed in Solidworks with calculation about characteristic parameter P of the planetary line and gear distribution. (2) PSHEV operation model is analyzed with leverage simulation method on the basis of that the power combiner is converted into a simulated leverage. (3) Referring to performance and selection of energy source, main components of the drive system are calculated with set power indicators as a premise, meanwhile, the type and parameters of the engine, motor I, motor II, main reducer ratio, batteries and so on are determined. (4) Through analysis on HEV brake kinetic, ideal and actual distribution curves of braking force acting on the front and rear axle are obtained, the ADVISOR braking force-distribution scheme and the change characteristic about braking force of braking energy recovery and regenerative braking system are both researched. (5) Models of the engine, motor I, motorâ…¡, batteries, power combiner and other parts and vehicle are established based on analysis of system function and characteristics of ADVISOR. (6) The modified and prototype vehicles are simulated and calculated with ECE_EUDC as a driving cycle to compare their simulation results, which show that the overall energy-utilized ratio of modified vehicle is 16.7%, but that of prototype vehicle is only 12.2%, besides, compared with the original model, the modified vehicle has significant improvement in terms of power, fuel economy and emission, etc., whose fuel consumption for 100 kilometers is only 6.2L with reduced rate 28.7%. Simulation results among engine, motor I and II are the same from which correctness of the built model is verified and the relationship among related parameters of PSHEV, fuel economy and exhaust emission during the design process is obtained.Results in this paper will be references for researches to convert the traditional hybrid vehicle into PSHEV.
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