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    • 6. 发明专利
    • Pressure detecting circuit
    • 压力检测电路
    • JPS59162431A
    • 1984-09-13
    • JP3595983
    • 1983-03-07
    • Hitachi Ltd
    • UCHIYAMA KAORUKURITA MASAHIRO
    • G01L9/04G01L9/00G01L9/06
    • G01L9/06
    • PURPOSE:To prevent the hunting of a switch and to make characteristic aging less, by comparing the outputs of intermediate points of a bridge formed by strain gages, controlling a driving terminal by feedback, and providing hysteresis. CONSTITUTION:A bridge circuit comprises resistors 4, 5, 6, and 7, whose resistances are decreased and increased with respect to pressures, and which are semiconductor piezoelectric resistors that are diffused and formed in silicon diaphragm. A pressure measuring strain gage is formed by the bridge circuit. The outputs of the intermediate points of the bridge circuit are compared and processed. The measured output corresponding to the pressure is outputted as a switching output for controlling the air fuel ratio and the like of an internal combustion engine. Meanwhile, the output of a comparator 10 is fed back to the driving terminal of the bridge circuit. Hysteresis is provided in the measured output from the comparator 10. Thus the hunting of the switch is prevented, abrasion and the like are not generated due to the constitution having no mechanical contact points and the like, and the characteristic aging variation are reduced.
    • 目的:通过比较由应变计形成的桥梁的中间点的输出,通过反馈控制驱动端子并提供滞后,防止开关的捕获和特性老化较少。 构成:桥接电路包括电阻器4,5,6和7,其电阻相对于压力减小并增加,并且是在硅膜片中扩散和形成的半导体压电电阻器。 压力测量应变计由桥式电路形成。 对桥接电路的中间点的输出进行比较和处理。 输出对应于压力的测量输出作为用于控制内燃机的空燃比等的切换输出。 同时,比较器10的输出反馈到桥式电路的驱动端。 在比较器10的测量输出中提供迟滞。因此,由于没有机械接触点等的结构,防止开关的振荡,不产生磨损等,并且特性老化变化减小。