Study on shift schedule saving energy of automatic transmission of ground vehicles

To improve ground vehicle efficiency, shift schedule energy saving was proposed for the ground vehicle automatic transmission by studying the function of the torque converter and transmission in the vehicular drivetrain. The shift schedule can keep the torque converter working in the high efficiency range under all the working conditions except in the low efficiency range on the left when the transmission worked at the lowest shift, and in the low efficiency range on the right when the transmission worked at the highest shift. The shift quality key factors were analysed. The automatic trans-mission's bench-test adopting this shift schedule was made on the automatic transmission's test-bed. The experimental results showed that the shift schedule was correct and that the shift quality was controllable.

STUDY ON SHIFT SCHEDULE AND SIMULATION OF AUTOMATIC TRANSMISSION

From the point of view of saving energy, a new shift schedule and auto-controlling strategy for automatic transmission are proposed. In order to verify this shift schedule, a simulation program using a software package of Matlab/ Simulink is developed. The simulation results show the shift schedule is correct. This shift schedule has enriched the theory of vehicle automatic maneuvering and will improve the efficiency of hydrodynanic drive system of the vehicle.

STUDY ON SHIFT SCHEDULE OF AUTOMATIC TRANSMISSION TO IMPROVE ENGINEERING VEHICULAR EFFICIENCY

New shift schedule for automatic transmission is proposed from the point ofview of saving energy. The bench-test of automatic shift adopting this shift schedule is done onautomatic transmission's test-bed. The experimental results show the shift schedule is correct. Thisshift schedule has enriched the theory of vehicle automatic maneuvering and will improve theefficiency of hydrodynamic drive system of the vehicle.

工程车辆自动变速器的节能换挡规律研究

为了提高工程车辆的传动效率,从液力变矩器和变速器在车辆传动系统中的作用出发,推导出了利用变速器换挡来控制液力变矩器在高效区工作的变速器升降挡规律公式,并在此基础上得到了工程车辆自动变速器的节能换挡规律。该换挡规律可以将变矩器在变速器最低挡的左端低效区和最高挡的右端低效区除外的所有工况下的效率限定在某一理想的范围内。并在自动变速试验台上进行了台架试验,验证了其正确性。该换挡规律的提出,对提高工程车辆液力机械传动系统的传动效率、节约能源,具有十分重要的理论意义和应用价值。

工程车辆自动变速器换档规律研究及自动控制仿真

从节能角度出发 ,为电液自动变速器提出了一种全新的换档规律及其自动控制方案 ,并在Matlab/Simulink环境支持下 ,使用该换档规律对车辆进行了自动控制仿真 ,验证了该换档规律的正确性 .仿真结果表明 :利用换档规律公式 ,可以将变矩器在所有工况下的效率限定在某一理想的范围之内 .该换档规律的研究结果丰富了车辆自动操纵理论 ,对提高工程车辆液力机械传动系统的传动效率、节约能源具有指导意义和应用推广价值 .

基于Matlab/Simulink的工程车辆自动变速器换挡规律研究

针对工程车辆液力机械传动系统存在效率低的问题,本文主要对工程车辆自动变速器的换挡规律进行研究。通过人为设定效率最低值,得出了自动控制变速器的换挡规律,改变变矩器的输出转速;并建立了由车辆发动机、自动变速器和变矩器共同组成的车辆传动系统模型,并根据系统等效转换方法,确定建模假设条件,同时在Matlab/Simulink环境下对车辆自动变速器的换挡过程进行仿真验证。仿真结果表明,当换挡延时设定为3s时,可避免车辆频繁换挡,即使在车速发生变化的情况下,变速器通过换挡操作可保持涡轮高功率输出,而且可将车辆变矩器的传动效率控制在相对理想的范围内。该研究为国内工程车辆的节能改造提供了理论依据。