Study On Motor Active Synchronistic Technology During Shifting In Parallel Hybrid Electric Vehicle

Nowadays, because of environment pollution arising from thenumerous fuel automobile and energy source shortage, it is necessary ofdevelopment of new type motor vehicle with low energy consumption andemmission for automobile industry. Hybrid Electric Vehicle (HEV)has theadvantage that it can resolve the current energy crisis and the environmentproblem and is the best choice currently.This paper is supported by the major project on Electric Vehicle --Hybrid Electric Vehicle of 863 Program,carry on the research of the problemof parallel hybrid electric vehicle with two shafts during shifting. On the basisof the kinetics and dynamics of the powertrain during the whole shiftingprocess having analyzed, put forward adopting motor active synchronistictechnology during shifting to resolve this problem and analyze its possibilityfrom the theories.This paper institutes a motor active synchronistic control strategy duringshifting. At the same time of controling the speed of motor, Integrated gearshifting control can effectively shorten the shifting time and improve theshifting quality of the hybrid electric vehicle. A motor active synchronisticcontrol model was established on the basis of this control.A powertrain model of parallel hybrid electric vehicle with two shaftswas established on the platforms of MATLAB/Simulink in this paper. The keyof the model is the status of two nonlinear elements, clutch and transmission,especially the synchronistic process of shifting. The model is capable of notonly maintaining continuous variations of engine speed , motor speed andvehicle speed , but also imitating the operation of both clutch and transmission.The simulation is performed with motor active synchronistic controlstrategy during shifting process. The results show that the motor activesynchronistic control strategy can effectively shorten the shifting time andimprove the shifting quality. It is proved the validity of the motor activesynchronistic control strategy.Finally, from the test result, it is further proved the validity of the motoractive synchronistic control strategy during shifting process.