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1.发明授权Apparatus for controlling a load lifting element of a vehicle in response to the wearing of a motor brush 失效用于响应于电动机刷的磨损来控制车辆的负载提升元件的装置
公开(公告)号：US5177419A
公开(公告)日：1993-01-05
申请号：US676028
申请日：1991-03-27
申请人： William Pickering , Bruce A. Nielsen , Arthur Wild
发明人： William Pickering , Bruce A. Nielsen , Arthur Wild
摘要： An apparatus for controlling a load lifting implement of a work vehicle in response to the condition of a motor brush is provided. The vehicle has a frame and the load lifting implement is connected to the frame and elevationally moveable relative to the frame between first and second directions. A brush wear indicator senses the wear of the motor brush and produces a warning signal in response to a predetermined amount of wear of the motor brush. A control system receives the warning signal and responsively controllably inhibits the elevational movement of the load lifting implement in at least one of the first and second directions.
摘要翻译： 提供了一种用于响应于电动机刷的状态来控制作业车辆的起重工具的装置。 车辆具有框架，并且负载提升工具连接到框架并且在第一和第二方向之间相对于框架可升高地移动。 电刷磨损指示器感测电动机刷的磨损，并响应于电动机刷的预定量的磨损产生警告信号。 控制系统接收警告信号并响应于可控制地阻止起重工具在第一和第二方向中的至少一个方向上的升降运动。
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公开(公告)号：US5239242A
公开(公告)日：1993-08-24
申请号：US753149
申请日：1991-08-30
CPC分类号： B60L11/1805 , B60L3/00 , Y02T10/7005
摘要： Motor control systems having direction contacts for steering current through a motor are commonly associated with electrical industrial vehicles, such as lift trucks. Advantageously, the operation of the direction contacts should be optimized in order to prevent switching the contacts when current is present to the extent that such switching can be eliminated. The instant apparatus includes a logic device for receiving speed and direction demand signals and responsively controlling the direction contacts associated with a vehicle motor. The logic device also receives signals from a current sensor responsive to the magnitude of electrical current flowing through the electric motor. In response to the motor current signal indicating a value less than a predetermined value concurrent with either the motor direction demand signal having a neutral value or the motor speed demand signal having a zero value, the logic means produces a neutral motor direction command signal. Therefore, optimal control of the motor direction contacts is attained.
摘要翻译： 具有通过电动机的转向电流的方向接触的电动机控制系统通常与电动工业车辆（例如起重车）相关联。 有利的是，应当优化方向触点的操作，以便当存在电流以防止可以消除这种切换的程度时防止触点切换。 该瞬时装置包括用于接收速度和方向需求信号并且响应地控制与车辆电动机相关联的方向触点的逻辑装置。 逻辑器件还响应于流过电动机的电流的大小而从电流传感器接收信号。 响应于指示小于预定值的电动机电流信号与具有中性值的电动机方向要求信号或具有零值的电动机速度需求信号同时发生，逻辑装置产生中性电动机方向指令信号。 因此，可以实现电动机方向接触的最佳控制。
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公开(公告)号：US5084658A
公开(公告)日：1992-01-28
申请号：US676026
申请日：1991-03-27
IPC分类号： B60L11/18
CPC分类号： B60L11/1805 , Y02T10/7005
摘要： A motor speed control system for a vehicle is provided. The control system includes an electric motor connected to a power coupling element for delivering electrical energy to the motor in response to a control signal. A sensor produces a current signal in response to the magnitude of the current flowing through the motor. An accelerator pedal produces a command signal in response to a desired vehicle speed. A microprocessor receives the command signal and responsively delivers a pulse width modulated control signal to the power coupling element. The control signal has a duty cycle in a range between a minimum and predefined value. Additionally, the microprocessor receives the current signal and increases the duty cycle of the control signal by a predetermined amount beyond the predefined value in response to the received current signal.
摘要翻译： 提供一种用于车辆的电动机速度控制系统。 控制系统包括连接到功率耦合元件的电动机，用于响应于控制信号向电动机输送电能。 传感器响应于流过马达的电流的大小而产生电流信号。 加速器踏板响应于期望的车辆速度产生命令信号。 微处理器接收命令信号并且响应地将脉宽调制的控制信号传递给功率耦合元件。 控制信号具有在最小值和预定值之间范围内的占空比。 此外，微处理器响应于接收到的当前信号，接收当前信号并将控制信号的占空比增加超过预定值的预定量。
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