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    • 9. 发明公开
    • Measurement of transmission oil pressure by monitoring solenoid current
    • 通过监视电磁阀的线圈电流测量的油压在液压传动齿轮
    • EP1058104A2
    • 2000-12-06
    • EP00111223.4
    • 2000-05-25
    • EATON CORPORATION
    • Boardman, Mark David
    • G01L11/00F16H61/02F16K31/06B60T8/36
    • G01L11/00B60T8/36F16H61/0251F16H2059/683
    • A method and apparatus for measuring hydraulic pressure in a solenoid valve (102, 104) includes coupling the solenoid valve (102, 104) with a voltage source and monitoring the input current rise characteristic as the solenoid valve (102, 104) moves between the open and closed positions. The rise characteristic indicates the amount of current needed to move the solenoid valve (102, 104) and changes when the solenoid (102, 104) changes positions. The current levels in the characteristic are taken at two different time periods and compared to determine whether the solenoid (102, 104) has shifted positions by the second time period. Because a greater amount of current is required to move the solenoid valve (102, 104) if the hydraulic pressure is high, the rise characteristic will change sooner if the pressure is low and later if the pressure is high. The hydraulic pressure can therefore be determined by comparing the two current levels and correlating them with pressure values. As a result, hydraulic pressure can be measured and monitored without requiring attachment of a separate pressure sensor on the solenoid valve (102, 104).
    • 一种用于测量在电磁阀(102,104)的液压压力的方法和装置,包括耦合与电压源的电磁阀(102,104)和监测输入电流的上升作为电磁阀(102,104)特性之间移动 打开和关闭位置。 上升特性指示移动电磁阀(102,104)和变化当螺线管(102,104)改变位置所需的电流的量。 在特性的电流电平取在两个不同的时间段,并与确定性矿无论螺线管(102,104)具有第二时间段错开的位置。 因为电流更大量如果液压压力高移动电磁阀(102,104)是必需的,如果压力低,并且以后如果压力高的上升特性将改变越快。 的液压压力可以是THEREFORE确定性通过比较两个电流水平和关联themwith压力值开采。 其结果是,液压可以被测量并且不会对电磁阀(102,104)要求一个单独的压力传感器的附接监测。