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    • 1. 发明授权
    • Solid-state threshold detector
    • 固态检测器
    • US4001676A
    • 1977-01-04
    • US608076
    • 1975-08-27
    • John W. HilePaul R. Rabe
    • John W. HilePaul R. Rabe
    • G01F23/26G01R19/165G01R27/26
    • G01R19/16585G01F23/266
    • An apparatus for providing a warning when the magnitude of a monitored parameter, such as vehicle fuel level, is within a critical range. A charge pump repeatedly charges a variable capacitor having a capacitance progressively changing with the magnitude of the monitored parameter and a reference capacitor having a capacitance equal to the capacitance of the variable capacitor when the magnitude of the monitored parameter is at the threshold of the critical range. After each charge, the two capacitors are discharged at a controlled rate with their voltage charge being monitored by threshold detectors, each of which provides an output when the voltage across the respective capacitor exceeds a specified level. The outputs of the threshold detectors are coupled to a logic circuit which compares the duration of the outputs of the threshold detectors and generates an output when the duration of the output from the level detector monitoring the reference capacitor varies from the time duration of the output from the level detector monitoring the reference capacitor in a sense representing a critical magnitude of the condition. An indicator is responsive to the output signal from the logic circuit for providing a warning of the critical magnitude of the condition.
    • 2. 发明授权
    • Fuel injector driver circuit
    • 燃油喷射器驱动电路
    • US4173030A
    • 1979-10-30
    • US906472
    • 1978-05-17
    • Paul R. Rabe
    • Paul R. Rabe
    • F02D41/30H01H47/32
    • F02D41/3005F02D2041/2017F02D2041/2031
    • A circuit is described for energizing an electromagnetically operated fuel injector from an unregulated voltage source in response to an injection command pulse. The injector pull-in current is provided by directly coupling the unregulated voltage across the injector upon the initiation of the injection command pulse. The injector current is thereafter reduced to a lower hold-in value. The circuit is voltage compensated by a pair of timers the first of which compensates for the voltage dependent injector pull-in time by adjusting the time that the unregulated voltage is directly applied across the injector as a function of the value of the unregulated voltage to insure that the injector is energized for all values of the unregulated voltage while minimizing the time period that the unregulated voltage is directly coupled across the fuel injector. The second timer extends the time of injector energization beyond termination of the injection command pulse by a time period dependent upon the value of the unregulated voltage so as to compensate for the voltage dependent injector pull-in time so that the injector is energized for a time period substantially equal to the injection command pulse for all values of the unregulated supply voltage.
    • 描述了用于响应于喷射命令脉冲从未调节的电压源激励电磁操作的燃料喷射器的电路。 注射器引入电流通过在注入命令脉冲开始时直接耦合注入器上的未调节电压来提供。 然后将喷射器电流减小到较低的保持值。 该电路由一对定时器进行电压补偿,其中第一个定时器通过调节不受调节的电压直接施加在喷射器上的时间来补偿电压相关的注入器引入时间,作为未调节电压的值的函数,以确保 注射器对于所有未调节电压的值都通电,同时使不稳定电压直接耦合在燃料喷射器两端的时间周期最小化。 第二计时器将喷射器通电的时间延长到喷射命令脉冲的终止之后,取决于未调节电压的值的时间周期,以便补偿依赖于电压的喷射器引入时间,使得喷射器通电一段时间 周期基本上等于用于所有未调节电源电压值的注入命令脉冲。
    • 4. 发明授权
    • Solid state threshold detector with hysteresis
    • 具有滞后的固态阈值检测器
    • US4065721A
    • 1977-12-27
    • US741729
    • 1976-11-15
    • Paul R. Rabe
    • Paul R. Rabe
    • G01R19/165H03K5/20H03K7/08H03K7/10
    • G01R19/16585
    • An apparatus for providing an output digital signal when the magnitude of a monitored parameter is within a critical range. An oscillator repeatedly charges each of first and second capacitors to a predetermined voltage level. A monitoring resistor is parallel coupled with the first capacitor and has a resistance progressively changing with the magnitude of the parameter to define a rate of discharge of the first capacitor, between repeated chargings, determined by the parameter. A reference resistor is parallel coupled with the second capacitor and has a resistance equal to the resistance of the monitoring resistor when the magnitude of the monitored parameter is at the threshold of the critical range and defines a first reference rate of discharge of the second capacitor between repeated chargings. The voltages across the first and second capacitors are monitored by respective threshold detectors, each of which provides an output when the voltage across the respective capacitor exceeds a specified level. The outputs of the threshold detectors are coupled to a logic circuit which compares the duration of the outputs of the threshold detectors and generates an output when the duration of the output of the level detector monitoring the first capacitor varies from the time duration of the output of the level detector monitoring the second capacitor in a sense representing a critical magnitude of the condition. A circuit is responsive to the output of the logic circuit to couple a third resistor in parallel with the reference resistor to define a second reference rate of discharge of the second capacitor between repeated chargings so as to provide a hysteresis in the output signal from the logic circuit in response to variations of the monitored parameter.
    • 一种用于在所监视的参数的幅度处于临界范围内时提供输出数字信号的装置。 振荡器将第一和第二电容器中的每一个重复地充电至预定的电压电平。 监控电阻器与第一电容器并联耦合,并且随着参数的大小逐渐改变电阻以限定由参数确定的重复充电之间的第一电容器的放电速率。 参考电阻器与第二电容器并联耦合,并且当监测参数的幅度处于临界范围的阈值时具有等于监控电阻器的电阻的电阻,并且将第二电容器的放电的第一参考速率定义为 重复充电。 第一和第二电容器两端的电压由相应的阈值检测器监测,每个阈值检测器在相应电容器两端的电压超过指定电平时提供输出。 阈值检测器的输出耦合到逻辑电路,该逻辑电路比较阈值检测器的输出的持续时间,并且当监视第一电容器的电平检测器的输出的持续时间从输出的持续时间变化时产生输出 电平检测器在表示条件的临界幅度的意义上监视第二电容器。 电路响应于逻辑电路的输出以将第三电阻器与参考电阻并联,以便在重复充电之间限定第二电容器的第二参考放电速率,从而在来自逻辑电路的输出信号中提供迟滞 响应于监视参数的变化。