Measuring and testing – Simulating operating condition – Marine
Patent
1980-05-21
1983-02-15
Myracle, Jerry W.
Measuring and testing
Simulating operating condition
Marine
73204, G01F 168
Patent
active
043733832
ABSTRACT:
A device is proposed for burnoff of a measuring resistor, in particular a hot wire or hot film in the air flow rate meter of an internal combustion engine, wherein the occurrence of the burnoff procedures, their intensity, and their duration can be controlled in open-loop fashion. Primarily the initiation of a burnoff procedure is made dependent upon how often the driving or ignition circuit of a vehicle equipped with the engine is shut off. The initiation of the procedure can be controlled in addition in accordance with operational characteristics, for instance. The realization substantially includes a counter following the driving switch and having an associated comparator, wherein the threshold value of this comparator is controllable both in accordance with operational characteristics and, if needed, in accordance with time. Furthermore a timing element is provided with the aid of which the onset of a burnoff procedure can be delayed after the shutoff of the engine. The different intensity of a burnoff procedure can be realized via the parallel disposition of different resistors with the bridge resistors, in order to obtain a predefined bridge imbalance.
REFERENCES:
patent: 4196622 (1980-04-01), Peter
Plapp Gunther
Romann Peter
Greigg Edwin E.
Myracle Jerry W.
Robert & Bosch GmbH
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