Apparatus for temperature control of a resistor used for measure

Details Apparatus for temperature control of a resistor used for measure Apparatus for temperature control of a resistor used for measure

1979-11-26

1982-11-09

Myracle, Jerry W.

Measuring and testing

Volume or rate of flow

Thermal type

73118, G01F 168

Patent

active

043578292

ABSTRACT:
An apparatus for the temperature control of a resistor used for measurement purposes, in particular, in combination with air flow rate measurement purposes, in particular, in combination with air flow rate measuring devices in internal combustion engines for a vehicle wherein the temperature of the resistor with current flowing through it is regulated during the measurement phase and in particular, operational states of the system provided with the apparatus and/or at particular times, the flow of current through the resistor is increased for the purpose of burning off dirt particles, which would falsify the measurement result, from the surface of the resistor which is formed, for example, as a hot wire. The apparatus includes a memory for picking up a signal such as whether a particular engine temperature is present at the beginning of one operational cycle or not and when this temperature is present, a red-hot heating procedure is omitted when the engine is subsequently turned off. In addition, the increase in current for initiating the red-hot heating procedure may also be controlled in accordance with operational duration and driving distance of the vehicle and in accordance with time.

REFERENCES:
patent: 4089214 (1978-05-01), Egami et al.
patent: 4196622 (1980-04-01), Peter
Grant et al., "Fundamentals of Hot Wire Anemometry", in Symp. on Measurements in Unsteady Flow, 1962, p. 51.

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