Design and application of electric oil pump in automatic transmission for efficiency improvement and start-stop function

作者：Liu Yan-fang; Dong Peng^*; Liu Yang; Xu Xiang-yang

来源：Journal of Central South University, 2016, 23(3): 570-580.

DOI：10.1007/s11771-016-3104-2

• automatic transmission
• electric oil pump
• mechanical oil pump
• start-stop function
• efficiency improvement
• forward driving simulation
• control strategy

For the purpose of improving efficiency and realizing start-stop function, an electric oil pump (EOP) is integrated into an 8-speed automatic transmission (AT). A mathematical model is built to calculate the transmission power loss and the hydraulic system leakage. Based on this model, a flow-based control strategy is developed for EOP to satisfy the system flow requirement. This control strategy is verified through the forward driving simulation. The results indicate that there is a best combination for the size of mechanical oil pump (MOP) and EOP in terms of minimum energy consumption. In order to get a quick and smooth starting process, control strategies of the EOP and the on-coming clutch are proposed. The test environment on a prototype vehicle is built to verify the feasibility of the integrated EOP and its control strategies. The results show that the selected EOP can satisfy the flow requirement and a quick and smooth starting performance is achieved in the start-stop function. This research has a high value for the forward design of EOP in automatic transmissions with respect to efficiency improvement and start-stop function.

• 出版日期2016-3
• 单位北京航空航天大学