Air fuel ratio detecting device

Details Air fuel ratio detecting device Air fuel ratio detecting device

1987-07-30

1990-01-02

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204410, 204412, 204425, G01N 2758

Patent

active

048911216

ABSTRACT:
An air fuel ratio detecting device which is improved in accuracy as compared to similar prior art devices comprises a sensor cell for developing an electrical signal in response to the difference between the concentration of oxygen in the exhaust gas and the concentration of oxygen in a reference gas, a controlling means for developing an electrical control signal having a polarity determined from the output of the sensor cell, a pump cell for moving oxygen ions in response to the electrical control signal received from the controlling means, a control current detecting means for detecting control current flow between the controlling means and the pump cell, an air fuel ratio detecting means for detecting the air fuel ratio from the control current flow, a stoichiometric air fuel ratio detecting means for detecting the direction of the control current flow so as to determine the stoichiometric air fuel ratio, a storage means for storing therein a linear air fuel ratio value which is determined in a predetermined functional relationship with respect to the magnitude of the control current flow, a linear air fuel ratio detecting means for detecting the magnitude of the control current flow detected by the control current detecting means so as to compare the same with the stored linear air fuel ratio value from the storage means; and a correcting means for correcting the predetermined functional relationship stored in the storage means when a stoichiometric air fuel ratio signal is developed from the stoichiometric air fuel ratio detecting means.

REFERENCES:
patent: 4578171 (1986-03-01), Yamada et al.
patent: 4578172 (1986-03-01), Yamada et al.
patent: 4591421 (1986-05-01), Yamada et al.
patent: 4594139 (1986-06-01), Asayama et al.
patent: 4601809 (1986-07-01), Kitahara
patent: 4615787 (1986-10-01), Yamada et al.
patent: 4707241 (1987-11-01), Nakagawa et al.

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