Air-fuel ratio controller for internal-combustion engine

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

2005-06-14

2005-06-14

Mohanty, Bibhu (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C123S672000, C123S344000

Reexamination Certificate

active

06904899

ABSTRACT:
An output signal from a downstream-side exhaust gas sensor is fed back into a fuel injection rate so that the air-fuel ratio of the exhaust gases flowing out from a catalyst may match a reference value. In this sub-feedback control process, the integral value of the deviation between the output signal of the downstream-side exhaust gas sensor and a reference value is calculated, and the resulting integral-data signal is smoothed. A learning value for compensating for the permanent error included in an air-fuel ratio signal from an A/F sensor is learnt from the integral-data signal generated by the above smoothing operation.

REFERENCES:
patent: 5762055 (1998-06-01), Yamashita et al.
patent: A 8-291738 (1996-11-01), None

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