Internal-combustion engines – Charge forming device – Having fluidic logic control means
Patent
1980-10-23
1982-04-13
Nell, Raymond A.
Internal-combustion engines
Charge forming device
Having fluidic logic control means
123489, F02B 308, F02D 500
Patent
active
043242189
ABSTRACT:
An air-fuel ratio detecting system detects the air-fuel ratio of the mixture supplied to an engine by means of titania whose electric resistance value varies in response to the oxygen content of the exhaust gases. The titania is connected in series with a reference resistor and a fixed voltage is applied to the junction of the titania and the reference resistor so as to generate a voltage corresponding to a change in the electric resistance of the titania. The detection voltage generated at the junction indicates the air-fuel ratio of the mixture and it is compared with a reference voltage for determining whether the air-fuel ratio is equal to the stoichiometric air-fuel ratio. The electric resistance of the titania varies with its operating temperature and the detection voltage varies correspondingly. To prevent any error in the control of air-fuel ratio due to a change in the temperature-dependent detection voltage, the peak value of the detection voltage which indicates that the air-fuel ratio of the mixture is greater than the stoichiometric ratio is sampled and the reference voltage is changed in response to the peak voltage. A programmable read-only memory is used to allow easy setting of the peak voltage and the reference voltage in a nonlinear relation with each other.
REFERENCES:
patent: 4140085 (1979-02-01), Rabus et al.
patent: 4156413 (1979-05-01), Taplin
patent: 4170965 (1979-10-01), Aono
patent: 4171690 (1979-10-01), Hosaka et al.
patent: 4237839 (1980-12-01), Ueno et al.
Hattori Tadashi
Ueno Yoshiki
Nell Raymond A.
Nippon Soken Inc.
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