Engine control to achieve rapid catalyst warm-up

Details Engine control to achieve rapid catalyst warm-up Engine control to achieve rapid catalyst warm-up

1994-12-23

1996-12-17

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60284, 60285, F01N 320

Patent

active

055841767

ABSTRACT:
A system and method to control the ignition timing of engine (28) are used to rapidly warm a catalytic converter (52). A controller (8) calculates (402) hydrocarbon efficiency of the converter (52) from a ratio of the integrals of hydrocarbon sensors respectively positioned downstream (48) and upstream (46) of the converter (52). The controller retards ignition timing to a value retarded from nominal ignition timing (416, 426) when the calculated hydrocarbon efficiency is less than a desired efficiency (418).

REFERENCES:
patent: 4144853 (1979-03-01), Maruoka et al.
patent: 4936276 (1990-06-01), Gopp
patent: 5050551 (1991-09-01), Morikawa
patent: 5182907 (1993-02-01), Kuroda
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
patent: 5263318 (1993-11-01), Oota
patent: 5329764 (1994-07-01), Hamburg et al.
patent: 5357749 (1994-10-01), Ohsuga

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