自动变速车辆坡道行驶自适应换挡策略

摘要

在分析汽车纵向动力学模型的基础上,运用改进型最小二乘法对整车质量与广义坡度进行实时辨识,以克服采用单一遗忘因子的最小二乘辨识法对变化不同步的参数辨识效果不佳的缺点.制定了自适应坡道换挡策略并进行了实车道路试验.试验结果证明,新型换挡策略能有效地解决了传统换挡策略在坡道行驶时的问题,能够更好地满足自动变速器坡道行驶的要求.%With the analysis of vehicle longitudinal dynamic model, a modified recursive least squares for online estimation of vehicle mass and generalized slope was established. Compared with the recursive least squares of single forgetting factor, the modified algorithm had better performance in estimation of parameters with different change rates. On the base of that, the self-adaptive gearshift strategies of uphill and downhill slopes were developed. The vehicle road test results indicated that these strategies could improve the slope traveling performance of automatic transmission and overcome the problems encountered by traditional gearshift strategy travels on slopes.