Design And Research Of Powertrain Of Plug-in PHEB

Under the tendency of the energy saving, environmental protection and new energy vehicle, the fuel cell vehicle, pure electric vehicle and so on become the hot spot, especially the research and development of hybrid electric vehicle to be the fastest area.The thesis introduced and compared several kinds of hybrid electric vehicles, extruding the advantage of parallel hybrid electric vehicle. In the parallel hybrid electric vehicle, power coupling is the difficult point. The choice of coupling and the control strategy affect the power and economy. Now there are two kinds of power couplings:one is the Pruis of Toyota Company, which adopts the planetary gears and whose advantage is its compact size. The other one is that puts the engine, the clutch, the motor, the power coupling device and the gearbox apart. The torque is combined together by the engine and motor through the power coupling device. Its disadvantage results from the complex transmission parts and its arrangement.The thesis designs a new coupling device based on the comparison of the two structures above, which combines the engine and motor through the clutch and makes the motor and gearbox as a whole. In this way, the system makes a simpler structure without the traditional clutch and can shift automatically.This thesis introduces the shifting theory of the device that using the motor to complete the synchronization instead of the traditional synchronizing ring and the control strategy of the clutch, elaborate the difference between the clutch in this system and the traditional ones that achieve the unite of the engine and motor through pressure and speed control. The whole device is controlled by gas and it is tested through experiment and on-board test.The thesis adopts the Plug-in parallel hybrid electric project which means that it should increase the distance under the pure electric mode. The article puts forward a control strategy based on the speed control that in the low speed circumstance, the system works under the pure electric mode. And when the speed reach the required value, the engine become the power source and the engine works based on the steady characteristic curves. Under this mode, by controlling the motor performance the system give a balance of the economy and emission and distribute the power proportion of engine and motor logically and simultaneously.At last, the design is simulated in the ADVISOR to testify the validity of the power system and control strategy. And the 3-D model of the system is modeled in UG and the shifting procedure is simulated in the ADAMS to provide proof to the optimum design. It is also tested on the AVL test board and provides assistance for further design and optimization of clutch.