Measuring and testing – Gas analysis – Gas chromatography
Patent
1982-05-13
1984-08-07
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Gas chromatography
123440, G01N 3100, F02B 308
Patent
active
044635940
ABSTRACT:
To compensate for temperature-dependent shift on the operating characteristics of an oxygen ion conductive sensor which tends to shift the operating characteristics towards the "lean" range (.lambda.>1) at low temperature, and towards the "rich" range (.lambda.<1) at high temperature, the pulses derived from the sensor are delayed or shifted such that the trailing edge of the pulses, representative of shift from lean to rich direction, is transmitted with delay; dependent on temperature, the shift from rich to lean is also transmitted with delay. The delays are obtained by timing circuits (9, 14) which have variable time delays, the time delay being controlled by a temperature signal (9a) derived by sensing a-c resistance of the sensor, split by a high-pass filter and rectified. The pulses are extended by extending the trailing edge of the pulse by a first timing stage (9) or foreshorten, thus delaying, the occurrence of the leading edge of the pulses by a second timing circuit (14), the respective pulses being logically combined in dependence on temperature determined by a comparator (18) with respect to a temperature level of, for example, 300.degree. C.-400.degree. C. set point.
REFERENCES:
patent: 3875907 (1975-04-01), Wessel et al.
patent: 3948081 (1976-04-01), Wessel et al.
patent: 4140085 (1979-02-01), Rabus et al.
patent: 4345562 (1982-08-01), Drews et al.
"Automotive Handbook", pp. 275-277, 1976.
Raff Lothar
Wiedenmann Hans-Martin
Kreitman Stephen A.
Robert & Bosch GmbH
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