Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1994-11-03
1996-01-16
Kamen, Noah P.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123674, 123680, 123688, 123696, 123419, 12333924, 60284, F02D 4100
Patent
active
054839467
ABSTRACT:
Air/fuel and ignition control of engine (28) are used to more rapidly heat-up a catalytic converter (52). A control system (8) generates a fuel command (100) for fuel delivery to the engine (28) based upon at least an amount of air inducted into the engine. The fuel command is offset by a predetermined amount in a lean direction during a period after engine start to shift the engine exhaust gas mixture towards a preselected air/fuel ratio lean of stoichiometry (106-122). In addition, the fuel command is corrected by a correction value so that the exhaust gas mixture is shifted ore closely to the preselected air/fuel ratio (126-140). Correction values are adaptively learned (300-324) during a portion of the warm-up period from a feedback signal derived from an exhaust gas oxygen sensor (44). Ignition timing and engine idle are also controlled (350-374) to further achieve more rapid warm-up of the catalytic converter (52).
REFERENCES:
patent: 4144853 (1979-03-01), Maruoka et al.
patent: 4777924 (1988-10-01), Fujimura et al.
patent: 4936276 (1990-06-01), Gopp
patent: 5203300 (1993-04-01), Orzel
patent: 5211011 (1993-05-01), Nishikawa et al.
patent: 5228421 (1993-07-01), Orzel
patent: 5253631 (1993-10-01), Curran
Hamburg Douglas R.
Husak Philip W.
Meyer Daniel L.
Whittier Steven R.
Ford Motor Company
Kamen Noah P.
Lippa Allan J.
May Roger L.
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