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    • 2. 发明授权
    • Method and apparatus for controlling hydraulically-operated continuously
variable transmission of belt-and-pulley type
    • 用于控制皮带和皮带轮类型的液压无级变速器的方法和装置
    • US4628773A
    • 1986-12-16
    • US665367
    • 1984-10-26
    • Hiroshi ItohShigeki HiramatsuMitsuru TakadaTadashi Tamura
    • Hiroshi ItohShigeki HiramatsuMitsuru TakadaTadashi Tamura
    • F16H9/00B60K17/08F16H61/00F16H61/02F16H61/66F16H61/662F16H63/06B60K41/16
    • B60W30/18B60W10/04B60W10/101B60W30/1819F16H61/66F16H61/66259Y10T477/623Y10T477/62429
    • System and method for controlling a continuously variable transmission having a pair of variable-diameter pulleys disposed on input and output shafts, and a corresponding pair of hydraulic cylinders to change effective diameters of the pulleys. A speed ratio control valve assembly is used to control flows of a fluid to and from one of the cylinders. The control valve assembly is selectively placed in one of three states consisting of a first state for feeding the fluid to the one cylinder, a second state for discharging the fluid from the one cylinder, and a third state for restricting the flow to or from the one cylinder. The first and third states are alternately established while a ratio of an operating time in the first state to that in the third state is changed, for controlling a rate of flow of the fluid into the one cylinder, and the second and third states are alternately established while a ratio of operating time in the second state to that in the third state is changed, for controlling a rate of flow of the fluid from the one cylinder, whereby the speed ratio of the transmission is continuously varied by the one cylinder under control of the speed-ratio control valve assembly.
    • 用于控制具有设置在输入和输出轴上的一对可变直径滑轮的无级变速器的系统和方法,以及相应的一对液压缸,以改变滑轮的有效直径。 使用速比控制阀组件来控制流体流入和流出一个气缸。 控制阀组件选择性地放置在由用于将流体供给到一个气缸的第一状态和用于从一个气缸排出流体的第二状态的三种状态中的一种状态,以及用于限制流入或流出的流体的第三状态 一个缸。 交替地建立第一状态和第三状态,同时改变第一状态中的操作时间与第三状态的操作时间的比率,以控制流体进入一个气缸的流速,并且第二和第三状态是交替的 在第二状态下的运转时间与第三状态的运转时间的比率发生变化的情况下,为了控制来自一个气缸的流体的流量,由变速器的变速比在一个气缸的控制下连续变化 的速比控制阀组件。