Ultrasonic air flowmeter for motor vehicles

Details Ultrasonic air flowmeter for motor vehicles Ultrasonic air flowmeter for motor vehicles

1982-07-07

1984-12-18

Ruehl, Charles A.

Measuring and testing

Simulating operating condition

Marine

7386127, G01F 166

Patent

active

044884281

ABSTRACT:
An ultrasonic air flowmeter for an internal combustion engine of a motor vehicle includes at least two ultrasonic transmitter-receivers. One of the ultrasonic transmitter-receivers generates ultrasonic waves toward an upstream of an air flow so that a radiation direction of the ultrasonic waves obliquely intersects a direction of the air flow. On the other hand, the other ultrasonic transmitter-receiver generates ultrasonic waves toward a downstream of the air flow in the same manner. A difference in phase between outputs of the receivers is detected to obtain a rate of the air flow.

REFERENCES:
patent: 3751979 (1973-08-01), Ims
patent: 4078428 (1978-03-01), Baker et al.
patent: 4333352 (1982-06-01), Connery et al.
patent: 4408589 (1983-10-01), Hauler et al.
J. L. McShane-"Ultrasonic Flowmeters"-Flow, Its Measurement & Control in Science & Industry, vol. 1, 1974, I.S.A.

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