Air/fuel ratio control system

Details Air/fuel ratio control system Air/fuel ratio control system

1998-04-01

1999-09-21

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123691, 123681, 123672, 123687, F02D 4114

Patent

active

059540397

ABSTRACT:
An air/fuel control system (8) and method for an engine (28) having two engine banks coupled to a single catalytic converter (50) uses first and second exhaust gas oxygen sensors (44, 55) coupled to respective first and second exhaust manifolds (56, 57) and various engine operating parameters. During a first set of engine operating conditions, air/fuel control system (8) maintains the exhaust air/fuel ratio oscillations of the two bank in phase with one another. During a second set of engine operating conditions, air/fuel control system (8) maintains the exhaust air/fuel ratio oscillations of the two bank 180 degrees out of phase with one another. When transitioning, emission impacts are minimized.

REFERENCES:
patent: 5213088 (1993-05-01), Harada
patent: 5228287 (1993-07-01), Kuronishi et al.
patent: 5279114 (1994-01-01), Kurita et al.
patent: 5462038 (1995-10-01), Kotwicki et al.
patent: 5511377 (1996-04-01), Kotwicki

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