Measuring and testing – Simulating operating condition – Marine
Patent
1987-02-25
1988-06-14
Levy, Stewart J.
Measuring and testing
Simulating operating condition
Marine
G01M 1900
Patent
active
047503530
ABSTRACT:
A method of voltage compensation for an air/fuel ratio sensor as may be used in the exhaust system of a fuel injected internal combustion engine. The method comprises the steps of storing the design supply voltage in a look-up table, measuring the real time supply voltage and calculating a binary fraction value from the ratio of the present or real time supply voltage value and the design supply voltage value. The predetermined design threshold voltage value of the sensor is stored and then it is multiplied by the binary fraction value to get a real time threshold voltage value. The voltage output of the sensor is measured and compared with the real time threshold voltage value. In response to the comparison, a control signal is generated indicating whether or not the air/fuel mixture is lean.
REFERENCES:
patent: 4130095 (1978-12-01), Bowler et al.
patent: 4255789 (1981-03-01), Hartford et al.
patent: 4344317 (1982-08-01), Hattori et al.
patent: 4459669 (1984-07-01), Chujo et al.
Frick Michael J.
Wright Danny O.
Allied Corporation
Levy Stewart J.
Raevis Robert R.
Seitzman Markell
Wells Russel C.
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