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将汽车自动变速控制策略分成上层与下层两部分,进行自动变速分层协调控制。下层为最佳动力性和最佳经济性的基本换挡控制,上层决策层对识别的驾驶意图、车辆工况和道路环境信息进行占优分析和优先级设定,决策出车辆当前状态下性能最优的控制目标,并对下层基本换挡控制策略进行修正和调整。分析结果表明:采用分层协调控制策略的车辆在爬坡和过弯道工况时比独立控制换挡次数分别减少了4次和2次,在变速箱油温升高时比独立控制能及时降低挡位,低附着路面起步时挡位比独立控制高。采用分层协调控制策略可有效降低跳挡频率,减小换挡部件磨损,提高车辆通过性、行驶平顺性和安全性。
The car automatic transmission control strategy is divided into two parts, the upper and lower, automatic variable speed and coordinated control. The lower level is the basic shift control with the best power and the best economy. The upper level decision-making level dominates the identification of the driver’s intention, the vehicle condition and the road environment information, and prioritizes the decision making out of the current performance of the vehicle Optimal control objectives, and the underlying basic shift control strategy to amend and adjust. The analysis results show that the vehicles adopting the hierarchical coordination control strategy can reduce the number of shifting times by 4 times and 2 times respectively when climbing and cornering conditions than when independently controlled, Reduce the gear, low-adhesion road start gear higher than the independent control. Hierarchical coordination control strategy can effectively reduce the frequency hopping shift, reducing wear gear shift parts, improve vehicle passing, ride smoothness and safety.