Measuring and testing – Volume or rate of flow – Thermal type
Patent
1996-03-25
1997-04-01
Chilcot, Richard
Measuring and testing
Volume or rate of flow
Thermal type
374173, 731182, G01F 168
Patent
active
056168438
ABSTRACT:
A temperature detector resistor and a sensor resistor are disposed in an intake manifold of an internal combustion engine. The two resistors each belong to a respective bridge branch of a measuring bridge having a bridge diagonal which is led to a first differential amplifier. A current in the bridge is adjusted in such a way that the sensor resistor always has a prescribed overtemperature. Due to backfires in the intake manifold, damage can occur to the sensor resistor due to sudden strong heating of the temperature detector resistor as a consequence of a strong rise in current. In order to avoid such damage, a third bridge branch is connected in parallel with the two bridge branches. The third bridge branch has a tap which is supplied, as is another tap, to inputs of a second differential amplifier having an output signal influencing the bridge current in such a way that the current is limited to a prescribed value. The device is applicable in internal combustion engines.
REFERENCES:
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patent: 4854167 (1989-08-01), Czarnocki et al.
patent: 4938061 (1990-07-01), Carp
patent: 4947057 (1990-08-01), Czarnocki et al.
patent: 5181420 (1993-01-01), Suzuki et al.
Patent Abstracts of Japan, vol. 9, No. 329 (P-416) [2052]Dec. 24, 1985.
Patent Abstracts of Japan, vol. 12, No. 48 (P-666) [2895] Feb. 13, 1988.
Schifferl Ludwig
Wildgen Andreas
Artis Jewel V.
Chilcot Richard
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
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