Measuring and testing – Gas analysis – Gas of combustion
Patent
1991-02-28
1993-08-03
Williams, Hezron E.
Measuring and testing
Gas analysis
Gas of combustion
204406, 436137, G01N 27416
Patent
active
052318648
ABSTRACT:
An air fuel ratio detecting device is disposed in an exhaust gas passage of an engine, and detects the oxygen concentration in exhaust gases to produce a signal indicative of the air-fuel ratio of an air-fuel mixture supplied to the engine. The air-fuel ratio detecting device serves as a linear A/F sensor for detecting whether the air-fuel mixture is on a leaner or richer side of a stoichiometric ratio and for also detecting the value of the air-fuel ratio. An electric signal representative of the oxygen concentration in a detection chamber supplied with exhaust gases is applied by a sensor cell to a controller which then controls a pump cell to cause the oxygen concentration in the detection chamber to indicate a nearly stoichiometric ratio. The air-fuel ratio detecting device can continuously detect the air-fuel ratio with an electric control signal from the controller. The stoichiometric ratio is detected when the potential difference between the electrode of the pump cell jumps or varies discontinuously. Since the oxygen concentration difference directly serves as detected stoichiometric ratio information, the stoichiometric ratio can be detected with an increased response. The stoichiometric ratio may be detected, using a variable threshold value, based on the potential difference across the pump cell, and the threshold value is selected depending on a control parameter for fine adjustments of a target air-fuel ratio.
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Danno Yoshiaki
Ishida Tetsuro
Murakami Nobuaki
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Roskos Joseph W.
Williams Hezron E.
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