Measuring and testing – Volume or rate of flow – Thermal type
Patent
1986-06-16
1987-07-21
Myracle, Jerry W.
Measuring and testing
Volume or rate of flow
Thermal type
731182, G01F 168, G01M 1900
Patent
active
046809643
ABSTRACT:
A heater, which comprises an element whose resistance varies with changes in temperature, and a temperature element are provided in the air intake pipe of an engine. This heater and temperature element together with resistors form a bridge circuit to which heating power is supplied via a transistor. An engine control unit generates start signals Tin simultaneously with the rotation of the engine. A flip-flop circuit is set by these start signals and, when set, the transistor is turned on and the heating power rises. The output signal from the bridge circuit is supplied to a comparator and the output signal of the comparator resets the flip-flop circuit, which outputs a pulse-shaped signal representing the airflow quantity as a length of time. This pulse-shaped time signal is sent via a constant current circuit to another comparator, where it is compared with a reference voltage and the output signal from the comparator is supplied together with the above time signal to an exclusive OR circuit. This exclusive OR circuit outputs a first and second pulse signal as the measurement output signal Tout synchronously with the rise and fall of the time signal and this signal is supplied to the engine control unit.
REFERENCES:
patent: 3975951 (1976-08-01), Kohama et al.
patent: 4043195 (1977-08-01), Hunting
patent: 4058089 (1977-11-01), Schmidt et al.
patent: 4384484 (1983-05-01), Kohama et al.
patent: 4565091 (1986-01-01), Ito et al.
patent: 4596138 (1986-06-01), Ito et al.
patent: 4612894 (1986-09-01), Satoh et al.
Akiyama Susumu
Kinugawa Masumi
Mizuno Tiaki
Sato Yoshihisa
Sugiura Kengo
Myracle Jerry W.
Nippondenso Co. Ltd.
Raevis Robert R.
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