Shift schedule with dynamic three-parameter brought in angular acceleration of engine

Yan Zhang, Wenxing Ma, Zhe Yuan

COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(12D) 79-84

College of Mechanical Science and Engineering, Jilin University, Renmin Str. 5988, 130022Changchun, China

In order to make automatic transmission vehiclesmore reasonably select shift points, ensure optimal shift schedule, shift schedule with dynamic three-parameter was proposed through the analysis of thedynamic characteristics of engine and hydrodynamic torque converterunder unstable conditions and establishment of dynamic model of vehicle driveline, where parameters were vehicle speed, throttle opening and angular acceleration of engine crankshaft. Shift schedule with dynamic three-parameter was better than shift schedule with dynamic two-parameter in power performance and fuel economy which was verified by simulation test on a certain type of heavy vehicle, then power performance and fuel economy of the optimal dynamic shift schedule and the optimal fuel economy shift schedule with dynamic three-parameter were respectively compared and analyzed. The results show that angular acceleration of engine crankshafthas a great influence on the selection of shifting points, and shift schedules with dynamic three-parameter proposed have important theoretical significance and engineering application value on improving the performance of automatic transmission vehicles, improving the power performance and fuel economy, saving energy and reducing emissions.