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    • 50. 发明授权
    • Control for a moisture sensor
    • 控制湿度传感器
    • US4956591A
    • 1990-09-11
    • US377589
    • 1989-07-10
    • Kenneth L. SchierbeekMark L. LarsonKenneth Schofield
    • Kenneth L. SchierbeekMark L. LarsonKenneth Schofield
    • B60S1/08
    • B60S1/0818B60S1/0888B60S1/0837Y10S318/02
    • A control for a moisture sensing assembly, adapted for mounting on the inner surface of a vehicle window or windshield to control vehicle accessories such as windshield wipers, maximizes the window area being sensed in relationship to the size of the assembly and provides immunity to interference from environmental influences. In the preferred embodiment, moisture on the outer window surface is detected by first and second moisture sensors each including infrared energy radiating diodes and radiant energy detectors which detect and process radiant energy to produce a moisture signal that is a function of the moisture on the window. A synchronizing circuit intermittently actuates the radiating diode for the two sensors individually and alternatingly at equally-spaced intervals. The synchronizing circuit also inhibits the radiant energy detectors from processing the radiant energy signal except when the corresponding radiating diodes are emitting energy in order to prevent interference from the other radiating diodes and environmental influences. The synchronizing circuit includes a pair of oscillators which include capacitors and coupling devices that coordinate the discharging of the capacitors in a manner which provides equal intervals between alternating output pulses from the oscillators.
    • 适用于安装在车窗或挡风玻璃的内表面以控制诸如挡风玻璃刮水器的车辆配件的湿度感测组件的控制使得与组件尺寸相关联的感应窗口面积最大化,并且提供对来自 环境影响。 在优选实施例中,外窗表面上的水分由第一和第二湿度传感器检测,每个湿度传感器包括红外能量辐射二极管和辐射能量检测器,其检测和处理辐射能以产生作为窗口上水分的函数的湿度信号 。 同步电路以等间隔的间隔间歇地驱动两个传感器的辐射二极管,并以交替方式交替地驱动。 同步电路还禁止辐射能量检测器处理辐射能信号,除非相应的辐射二极管发射能量以防止来自其它辐射二极管的干扰和环境影响。 同步电路包括一对振荡器,其包括电容器和耦合器件,其以在来自振荡器的交替输出脉冲之间提供相等间隔的方式协调电容器的放电。