Lean air/fuel engine feedback control system

Details Lean air/fuel engine feedback control system Lean air/fuel engine feedback control system

1996-12-23

1998-02-03

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4100, F02M 2300, F02M 2500

Patent

active

057133417

ABSTRACT:
An engine air/fuel ratio control system maintains average engine air/fuel ratio at a desired lean air/fuel ratio during cold engine operation in order to more rapidly warm the catalytic converter. Fuel delivered to the engine is modulated with a truncated triangular wave which is truncated to minimize lean air/fuel excursions. An error signal is generated from the exhaust gas oxygen sensor output, and a proportional plus integral control responsive to the error signal generates a feedback correction value to maintain the desired air/fuel ratio. Gain of the controller is increased when the error signal indicates engine air/fuel operation leaner than a preselected air/fuel ratio to further minimize excursions in a fuel enleanment direction.

REFERENCES:
patent: 5211011 (1993-05-01), Nishikawa et al.
patent: 5230322 (1993-07-01), Curran et al.
patent: 5253632 (1993-10-01), Brooks
patent: 5465697 (1995-11-01), Hamburg et al.
patent: 5558076 (1996-09-01), Maki et al.

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