Device for air flow rate measurement in the air intake tube of a

Details Device for air flow rate measurement in the air intake tube of a Device for air flow rate measurement in the air intake tube of a

1980-06-06

1982-08-17

Ruehl, Charles A.

Measuring and testing

Simulating operating condition

Marine

73204, G01F 168

Patent

active

043443222

ABSTRACT:
A device for air flow rate measurement in the air intake tube of an internal combustion engine which has at least two temperature-dependent resistors in different branches of a bridge circuit having closed-loop electric current control, and which is characterized in that the temperature-dependent resistors are embodied as hot wires, that a temperature above the aspirated air temperature is selected for both hot wires, and that the difference of the hot wire temperatures is held to a constant value. The purpose of the device is to provide air flow rate measurement which is as error-free as possible, even when the aspirated air temperature is fluctuating rapidly. An identically embodied suspension and fastening of the individual hot wires is given as an example for the spatial disposition of the individual hot wires in the air intake tube.

REFERENCES:
patent: 4080821 (1978-03-01), Johnston
patent: 4279146 (1981-07-01), Wessel et al.

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