Coasting downshift control strategy for a multiple-ratio automatic transmission
    8.
    发明授权
    Coasting downshift control strategy for a multiple-ratio automatic transmission 有权
    用于多比率自动变速箱的降档控制策略

    公开(公告)号:US06254510B1

    公开(公告)日:2001-07-03

    申请号:US09532586

    申请日:2000-03-22

    IPC分类号: F16H5936

    摘要: A control strategy for a multiple-ratio transmission for an automotive vehicle comprising a shift valve system that responds to shift valve signals developed by a microprocessor controller, the controller being in communication with engine sensors indicating engine operating variables and transmission sensors indicating transmission operating variables, the shift valve system responding to shift signals developed by the microprocessor during coasting downshift of the vehicle from one gear ratio to a lower gear ratio with a closed engine throttle whereby torque reversals are avoided during coast-down, thereby eliminating inertia torque changes to improve the smoothness of coasting downshifts during cold engine operation.

    摘要翻译: 一种用于机动车辆的多比率变速器的控制策略,包括响应由微处理器控制器开发的换档阀信号的换档阀系统,所述控制器与指示发动机操作变量的发动机传感器和指示变速器操作变量的传动传感器通信, 换档阀系统响应于由微处理器在使用闭合的发动机节气门将车辆从一个齿轮比下降到较低的齿轮比时降档期间所产生的换档信号,从而在滑行期间避免扭矩反转,由此消除惯性转矩变化以改善 冷引擎运行期间滑行降档的平滑度。