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    • 4. 发明授权
    • Control arrangement for a hydrostatic system
    • 静液压系统的控制装置
    • US5561979A
    • 1996-10-08
    • US390001
    • 1995-02-17
    • Alan R. CoutantJerry D. Marr
    • Alan R. CoutantJerry D. Marr
    • F15B11/02F04B49/06F15B21/08F16D31/02
    • F16H61/462F04B49/065F15B21/087F04B2201/1201F04B2203/1201F16H61/425F16H61/435
    • In many hydrostatic systems, the variable displacement pump is controlled by an operator moving a directional control valve to provide pressurized fluid to the displacement changing mechanism thereof which in turn varies the displacement responsive to the degree of pressurized fluid being directed to the displacement changing mechanism. In order to insure that the displacement of the Variable displacement pump is at the desired displacement, various forms of follow-up mechanisms have been required. These follow-up mechanisms are many times complicated and expensive to add to the hydrostatic system. In the subject arrangement, the speed of the pump input shaft and the speed of the motor output shaft is sensed (R,S) and the signals directed to a microprocessor which in turn processes the signals and directs a control signal (P) to a solenoid operated proportional valve. The solenoid operated proportional valve moves in response to the control signal and directs pressurized fluid to the displacement controller of the variable displacement pump to change the displacement thereof. Once the speed of the output shaft is achieved, the microprocessor modifies the control signal to maintain the variable displacement pump at the needed displacement position to maintain the desired speed of the output shaft to a work system. This arrangement provides an accurate control of the displacement of the variable displacement pump without the need of providing complicated follow-up mechanisms and/or servo mechanisms.
    • 在许多流体静力学系统中,可变排量泵由操作者控制方向控制阀来控制,以将加压流体提供给其位移改变机构,该位移改变机构又响应于加压流体被引导到位移改变机构的程度而改变位移。 为了确保可变排量泵的位移处于所需的位移,已经需要各种形式的后续机构。 这些后续机制多次复杂并且昂贵,以增加静液压系统。 在主题布置中,泵输入轴的速度和电动机输出轴的速度被感测(R,S),并且指向微处理器的信号,微处理器进而处理信号并将控制信号(P)引导到 电磁比例阀。 电磁比例阀响应于控制信号而移动,并将加压流体引导到可变排量泵的排量控制器以改变其位移。 一旦实现输出轴的速度,微处理器就改变控制信号,以将可变排量泵保持在所需的位移位置,以将输出轴的期望速度保持在工作系统上。 这种布置提供了可变排量泵的位移的精确控制,而不需要提供复杂的后续机构和/或伺服机构。
    • 9. 发明授权
    • Vehicle generator control
    • 车辆发电机控制
    • US06394206B1
    • 2002-05-28
    • US09688363
    • 2000-10-12
    • Robert Fury
    • Robert Fury
    • B60K1728
    • F04B49/002B60K25/06F04B17/05F04B2203/1201H02K7/1815H02P9/04H02P2101/30
    • Control apparatus for maintaining constant speed of an AC generator carried aboard a motor vehicle having an engine, a transmission including a power take-off, and an AC generator. The control apparatus includes a hydraulic pump driven from the power take-off, a hydraulic motor drivably connected to the generator, a fluid circuit driving the hydraulic motor from the hydraulic pump, a closed center proportional servo control valve assembly controlling the fluid circuit, and a control circuit disposed to control the proportional control valve assembly. The control circuit includes an eddy current detecting speed sensor disposed to sense rotational speed of the hydraulic motor, or alternatively, includes an AC generator frequency reference signal generator, a comparing subcircuit which compares sensed speed of the hydraulic motor to a reference signal provided by a digital variable pulse generator, manual controls, an automatic ramp generator which controls acceleration of the generator such that acceleration proceeds gradually from a stopped condition to full operating speed, an annunciating display, and a main circuit breaker. The control valve assembly throttles both pressurized fluid entering the valve assembly from the pump and also spent fluid being returned to the pump through the valve assembly, thereby equalizing pressure drop on each side of the valve assembly. The hydraulic system includes a fluid storage tank, an oil filter, and an oil cooler.
    • 用于保持具有发动机的机动车辆,包括动力输出装置的变速器和交流发电机的交流发电机的恒定速度的控制装置。 控制装置包括从动力输出驱动的液压泵,可驱动地连接到发电机的液压马达,从液压泵驱动液压马达的流体回路,控制流体回路的闭合中心比例伺服控制阀组件,以及 设置成控制比例控制阀组件的控制电路。 控制电路包括设置用于检测液压马达的转速的涡流检测速度传感器,或者备选地包括AC发电机频率参考信号发生器,比较子电路,其将液压马达的感测速度与由 数字可变脉冲发生器,手动控制器,自动斜坡发生器,其控制发电机的加速度,使得加速从停止状态逐渐进入全速运行状态,报警显示器和主断路器。 控制阀组件从泵中节流进入阀组件的加压流体,并且还将废液通过阀组件返回到泵中,从而均衡阀组件每侧的压降。 液压系统包括流体储存罐,油过滤器和油冷却器。