Method for operating an internal combustion engine with...

Internal-combustion engines – Combustion chamber means having fuel injection only – Combustible mixture stratification means

Reexamination Certificate

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C123S299000, C123S305000

Reexamination Certificate

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07370629

ABSTRACT:
In a method for operating a spark-ignition internal combustion engine with direct fuel injection in the post-start phase at low temperatures, fuel is supplied to the combustion air in a pilot injection (MH) of a first fuel quantity during an intake stroke of the internal combustion engine such that the pilot injection (MH) forms a homogeneous, lean air/fuel mixture (λ>1) in substantially the entire combustion chamber, and a main injection (MS) of a second fuel quantity is subsequently injected into the combustion chamber during a compression stroke directly before the ignition time (ZT), said main injection (MS) forming in the region of the spark plug a stratified, rich air/fuel mixture (λ<1), which is then ignited by the spark plug.

REFERENCES:
patent: 6659072 (2003-12-01), Heinzelmann
patent: 6742500 (2004-06-01), Sauler et al.
patent: 6789527 (2004-09-01), Sauler et al.
patent: 6899077 (2005-05-01), Wagner et al.
patent: 198 15 226 (1994-10-01), None
patent: 102 42 227 (2004-03-01), None
patent: 103 05 941 (2004-08-01), None
patent: 101 14 054 (2004-09-01), None
patent: 1 223 329 (2002-07-01), None
patent: WO 03/067062 (2003-08-01), None

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