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    • 2. 发明授权
    • Apparatus for measuring a flow rate of intake air for an engine
    • 用于测量发动机的进气量的流量的装置
    • US4649745A
    • 1987-03-17
    • US671615
    • 1984-11-15
    • Toshio KondoAkio KobayashiShunichiro HiromasaAkira MasudaMasahiko Miyaki
    • Toshio KondoAkio KobayashiShunichiro HiromasaAkira MasudaMasahiko Miyaki
    • G01F1/698G01F1/68
    • G01F1/6986
    • An apparatus for measuring a flow of intake air to an engine includes a bridge circuit including a heat resistor placed in an intake air path of the engine, a resistor for sensing the temperature of the intake air, and a plurality of balance resistors. A heating current is supplied to this bridge circuit through a transistor controlled by a periodical current-passage control signal generated by a microcomputer. A signal Vh, representing a temperature change of the heat resistor heated by the heating current, is detected by the microcomputer. A first correction value is computed by using a difference between the detected value from the microcomputer and a signal Vho, representing temperature of the heat resistor when the bridge circuit is balanced at normal temperature. A time width correction value .DELTA.Do1 is computed from a table on the basis of the first correction value. The correction signal .DELTA.Do1 is used for correcting the current passage time. The current passage time width as corrected is used for computing a flow of the intake air.
    • 用于测量到发动机的进气的流量的装置包括桥接电路,其包括放置在发动机的进气通道中的热电阻器,用于感测进气的温度的电阻器和多个平衡电阻器。 通过由微型计算机产生的周期性电流通过控制信号控制的晶体管,向该桥式电路供给加热电流。 由微型计算机检测表示由加热电流加热的热电阻的温度变化的信号Vh。 通过使用来自微型计算机的检测值和信号Vho之间的差来计算第一校正值,该信号Vho表示在常规温度下桥接电路平衡时的热电阻器的温度。 基于第一校正值从表中计算时间宽度校正值DELTA Do1。 校正信号DELTA Do1用于校正当前通过时间。 校正的当前通过时间宽度用于计算进气的流量。