Internal-combustion engines – Combustion chamber means having fuel injection only – Combustible mixture stratification means
Reexamination Certificate
2008-05-13
2008-05-13
Argenbright, T. M (Department: 3747)
Internal-combustion engines
Combustion chamber means having fuel injection only
Combustible mixture stratification means
C123S299000, C123S305000
Reexamination Certificate
active
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.
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Köhler Bernd
Lux Christoph
Oechsle Michael
Spieth Andreas
Argenbright T. M
Bach Klaus J.
Daimler AG
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