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    • 4. 发明授权
    • Tire pressure monitor
    • 轮胎压力监视器
    • US4110732A
    • 1978-08-29
    • US768911
    • 1977-02-15
    • William M. JarochaWalter K. O'Neil
    • William M. JarochaWalter K. O'Neil
    • B60C23/04B60C23/00
    • B60C23/0408Y10S303/07
    • Low pressure in a vehicle tire is detected by an electronic system which compares the difference in phase between two cyclic signals and produces an output signal having a negative going pulse and a positive going pulse for each revolution of the tire. Each negative going pulse represents a decrease in phase between the two signals and is generated in response to a shorted coil passing through an electromagnetic field produced by an induction coil in a parallel resonant circuit which produces the second of the two signals. The first signal is produced by an oscillator and is used to excite the resonant circuit and as a reference signal. The coil is shorted by a closed switch in the tire when the pressure is normal. Abnormal tire pressure opens the switch and renders the coil ineffective. Each positive going pulse represents an increase in phase between the two signals and is generated in response to a ferrous metal plate passing through the field. A logic circuit includes a capacitor charged at a fixed rate and operative to activate a warning light when the capacitor charge exceeds a predetermined level. When the tire speed is above 5 mph, the negative going pulses cause the capacitor to discharge faster than it is charged. When the vehicle speed is below 5 mph, a low speed inhibit circuit responsive to the positive going pulses discharges the capacitor faster than it is charged.
    • 通过比较两个循环信号之间的相位差的电子系统来检测车辆轮胎中的低压,并且产生对于轮胎的每转一次具有负走向脉冲和正向脉冲的输出信号。 每个负向脉冲表示两个信号之间的相位的减小,并且是响应于产生第二个信号的并联谐振电路中由感应线圈产生的电磁场的短路线圈产生的。 第一个信号由振荡器产生,用于激励谐振电路和作为参考信号。 当压力正常时,线圈被轮胎中的闭合开关短路。 轮胎压力异常打开开关,使线圈无效。 每个正向脉冲表示两个信号之间的相位增加,并且响应于穿过场的黑色金属板产生。 逻辑电路包括以固定速率充电并且当电容器充电超过预定电平时可操作以激活警告灯的电容器。 当轮胎速度高于5 mph时,负向脉冲会使电容器放电速度快于充电速度。 当车速低于5mph时,响应于正向脉冲的低速抑制电路比电荷放电更快。