Output correction method for exhaust gas ingredient-concentratio

Details Output correction method for exhaust gas ingredient-concentratio Output correction method for exhaust gas ingredient-concentratio

1989-06-22

1991-01-01

Kaplan, G. L.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, 20415318, 204401, 204406, G01N 27409, F02M 700

Patent

active

049811258

ABSTRACT:
An output correction method for a proportional-output type O.sub.2 sensor including an oxygen concentration detecting element formed by an oxygen-pumping element and a cell element, each of the oxygen-pumping element and the cell element being composed of a wall of a solid electrolytic material having oxygen ion-conductivity, and a pair of electrodes having the wall interposed therebetween. The oxgen-pumping element is supplied with an output voltage corresponding to a difference between a voltage developed between the electrodes of the cell element and a predetermined reference voltage, and current flowing in the oxygen-pumping element is detected. A correction resistance supplies information indicative of a deviation of an air-fuel ratio detected by the sensor with respect to a predetermined reference air-fuel ratio. A correction value is determined on the basis of the information and the direction of flow of the current. The detected current is corrected by the use of the determined corrected value. A desired air-fuel ratio is calculated on the basis of the corrected current.

REFERENCES:
patent: 4770758 (1988-09-01), Suzuki et al.
patent: 4777922 (1988-10-01), Mieno et al.
patent: 4796587 (1989-01-01), Nakajima et al.
patent: 4841934 (1989-06-01), Logothetis et al.

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