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With an advanced foreign hydraulic automatic transmission as the objective, an analytical method for the gear-shifting schedule is proposed. First the demanded maximum gradient of test is estimated. Then a test scheme and analytical procedure is formulated by initial test and hypothetical shift parameters. Finally through gear-shifting tests under different road conditions, load, accelerator pedal position limitation, throttle opening and output shaft speed are found to be the gear-shifting parameters. Under a common road condition, the gear-shifting schedule is a double-parameter schedule. Based on the driver''s demands on braking and dynamic performance, different shift schedules are made under downhill, uphill and quick releasing acceleration pedal conditions. The operation criteria of down-shift schedule on abrupt grade are proposed. 相似文献
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为准确分析操纵快慢对液压驱动履带车辆转向动态特性的影响,运用Matlab/Simulink软件建立系统转向仿真模型.仿真结果表明:以最小相对转向半径为小半径转向情况下,慢速转向与快速转向相比较,转向角速度响应延迟时间缩短一半,调节时间明显减少了1/3;随车速升高,以最小相对转向半径进行转向时,减缓转向操纵速度,转向响应延迟以及转向调节时间变化不大.车辆在行驶过程中驾驶员转向操纵时间约为3s为宜,慢速转向动态响应特性要明显好于快速转向. 相似文献
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