水平路面汽车滑行时纵向动力学性能分析

Analysis on Longitudinal Dynamic Performance of Vehicle While Sliding on Level Road

滑行是常用的汽车驾驶方式。研究汽车滑行中速度、减速度、滚动阻力和空气阻力的变化规律对合理利用汽车动力，降低汽车油耗具有重要意义。根据汽车纵向动力学分析，通过滑行试验，利用最小二乘原理建立水平路面车辆滑行时车速、减速度、滚动阻力与空气阻力、时间等参数变化的关系模型。试验表明：滑行车速、滑行减速度随滑行时间的延长而减小，滑行减速度、滑行阻力（包括空气阻力和滚动阻力）随滑行车速的减小而减小。最后试验验证表明，所建立的参数关系模型精确度较高，该模型对机动车驾驶者选择合理、经济的滑行方式具有参考和借鉴价值。

Sliding is a common method in vehicle -driving, so it is very important to analyze the variation of sliding speed, deceleration, rolling resistance and air resistance in order to utilize power properly and reduce fuel consumption. According to vehicle longitudinal dynamics analysis and sliding test, relational model about those pa- rameters is established by use of the least square principle. The test shows that speed and deceleration decrease with the sliding time and sliding resistance （air drag and rolling resistance） and deceleration decrease with sliding speed. Finally, tJae model is verified to be effective and useful.