Measuring and testing – Test stand – For engine
Patent
1977-03-10
1978-01-10
Myracle, Jerry W.
Measuring and testing
Test stand
For engine
73204, 123 32EA, G01M 1500
Patent
active
040672336
ABSTRACT:
A thermally-sensitive resistor is positioned in each of two separate passages provided in the intake pipe of an internal combustion engine, and an electric heater is positioned upstream of one of the thermally-sensitive resistors with respect to the direction of flow of intake air. The thermally-sensitive resistors form, along with two reference resistors, a bridge circuit which converts the difference between the resistances of the thermally-sensitive resistors caused by the electric heater, i.e., the difference between the temperatures in the passages to a voltage difference. A control circuit controls the voltage across the electric heater in such a manner that the said voltage difference is maintained constant and thus the amount by weight of intake air can be directly obtained. The input voltages to the thermally-sensitive resistors are applied in the form of pulses through an oscillator circuit thereby reducing the problem of drift of the bridge circuit.
REFERENCES:
patent: 1260498 (1918-03-01), Wilson
patent: 2994222 (1961-08-01), Laub
patent: 3747577 (1973-07-01), Mauch et al.
patent: 3824966 (1974-07-01), Schneider et al.
Egami Tsuneyuki
Kawai Hisasi
Kohama Tokio
Obayashi Hideki
Myracle Jerry W.
Nippon Soken Inc.
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