Method of compensating output of air/fuel ratio sensor for varia

Details Method of compensating output of air/fuel ratio sensor for varia Method of compensating output of air/fuel ratio sensor for varia

1992-06-11

1993-11-30

Raevis, Robert

Measuring and testing

Gas analysis

Gas of combustion

204406, G01N 3002

Patent

active

052654583

ABSTRACT:
Method of compensating an output signal (YA) of a sensor exposed to an exhaust gas produced from an air-fuel mixture, the sensor including an electrochemical sensing cell which produces an electromotive force (Vs) corresponding an oxygen partial pressure in an internal space into which the exhaust gas diffuses with a predetermined resistance, and an oxygen pumping cell to which a pump current (Ip) is applied so as to control the oxygen partial pressure in the internal space such that the electromotive force is held at a constant value. The output signal corresponds to the pump current. The method includes the steps of: converting the analog output signal (YA) into a digital signal (YD) by an analog/digital converter; compensating the analog signal to a first sensitivity compensation, by adjusting an input signal range (FSR) of the analog/digital converter according to a coefficient (KA) which corresponds to a coefficient (KO.sub.2) of sensitivity of the pump current of the sensor to the O.sub.2 concentration of the exhaust gas.

REFERENCES:
patent: 4790924 (1988-12-01), Logothetis et al.
patent: 4796587 (1989-01-01), Nakajima et al.
patent: 4860712 (1989-08-01), Nakajima et al.
patent: 4875981 (1989-10-01), Usami et al.
patent: 5034112 (1991-07-01), Murase et al.

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