The Open Mechanical Engineering Journal

2015, 9 : 333-338
Published online 2015 May 29. DOI: 10.2174/1874155X01509010333
Publisher ID: TOMEJ-9-333

Shift Quality Analysis of Heavy-Duty Vehicle Automatic Transmission Shift Control Valve

Ma Wenxing , Zhang Yan , Wang Ruoyang and Lu Xiuquan
College of Mechanical Science and Engineering, Jilin University, Renmin Street, Changchun, Postcard: 130022, China.

ABSTRACT

The structural concepts of Switch solenoid valve and proportional solenoid valve were proposed for the hydraulic shift control system of some hydrodynamic mechanical automatic transmissions. Shift oil pressure of stationary combination valve and proportional solenoid valve was modeled, simulated, contrasted and analyzed by dynamic simulation software in order to study the shift quality of heavy-duty vehicle automatic transmission. The results show that proportional solenoid valve is better to control the characteristic of shift oil pressure, reduce shift shock, improve shift quality and comfort than stationary combination valve. The correctness and validity of the model were verified through bench test, which reflected the dynamic characteristics of shift oil pressure of hydrodynamic mechanical automatic transmission. The results can be used to match the performance and predict heavy-duty vehicle shifting process, and to further lay the foundation for the enhancement of shift performance of the system.

Keywords:

Shift oil pressure, dynamic simulation, stationary combination valve, proportional solenoid valve, hydrodynamic mechanical automatic transmission.