Abstract：The mechanical models were developed for engine, working pump, torque converter and automatic transmission in the transmission system of construction vehicle, and the dynamical equation was deduced. To describe the shift characteristics, the torque and motion of the clutches of automatic transmission were discussed during shifting. The relations were derived analytically among the angular velocity, torque of gearbox, rotational velocity, throttle opening of engine and torque converter quotient. The impact of the parameters of engine and torque converter on shift quality was derived. To improve the shift quality, the cushion valve control, timing control and their combination control for engine-transmission system were developed. Finally, a simulation test for transmission system was carried out to validate the availability of control algorithm and to test the integrated performance of shift quality. The results show a significant improvement in terms of shift quality by applying valve control, timing control and their combination control.
赵丁选, 崔功杰, 李东兵 . 工程车辆传动系统的换挡品质[J]. 江苏大学学报（自然科学版）, 2008, 29(5): 386-389.
Zhao Dingxuan, Cui Gongjie, Li Dongbing- . Shift quality of transmission system for construction vehicle[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2008, 29(5): 386-389.
2008, Vol. 29 
