Air-fuel ratio controller of internal combustion engine

Details Air-fuel ratio controller of internal combustion engine Air-fuel ratio controller of internal combustion engine

1989-03-01

1990-09-25

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123489, 204401, F02D 4122

Patent

active

049586114

ABSTRACT:
The air-fuel (A/F) ratio controller of an internal combustion engine related to the invention detects occurrence of abnormal condition in a heater on the basis of the resistance value of this heater which heats an oxygen sensor generating a specific voltage responsive to the difference of oxygen concentration between atmosphere and exhaust gas of the engine and of an oxygen pump allowing the pump current flow in order that the voltage can be the predetermined value. If abnormal condition arises in the heater, the A/F ratio controller stops fuel feedback control operation. The A/F ratio controller related to the invention forms a Wheatstone bridge circuit which includes the heater mentioned above and detects occurrence of an abnormal condition in the heater on the basis of the equilibrium condition of signal outputted from the Wheatstone bridge circuit.

REFERENCES:
patent: 4706633 (1987-11-01), Nakagawa
patent: 4707241 (1987-11-01), Nakagawa et al.
patent: 4708777 (1987-11-01), Kuraoka
patent: 4715343 (1987-12-01), Kinoshita
patent: 4721084 (1988-01-01), Kawanabe et al.
patent: 4724814 (1988-02-01), Mieno et al.
patent: 4724815 (1988-02-01), Mieno et al.
patent: 4765298 (1988-08-01), Kojima et al.
patent: 4777922 (1988-10-01), Mieno et al.
patent: 4819602 (1989-04-01), Mieno et al.

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