In-cylinder direct-injection spark-ignition engine

Details In-cylinder direct-injection spark-ignition engine In-cylinder direct-injection spark-ignition engine

1998-07-16

1999-10-19

Kwon, John

Internal-combustion engines

Combustion chamber means having fuel injection only

Combustible mixture stratification means

F02B 1700

Patent

active

059671149

ABSTRACT:
An in-cylinder direct-injection spark-ignition engine using at least a homogeneous combustion mode where early fuel-injection on intake stroke produces a homogeneous air-fuel mixture and a stratified combustion mode where late fuel-injection on compression stroke produces a stratified air-fuel mixture, comprises a variable valve overlap device mounted on at least one of intake and exhaust valves for variably adjusting a valve overlap during which open periods of the intake and exhaust valves are overlapped, and a control unit connected to a fuel injector for switching between the homogeneous combustion mode and the stratified combustion mode, and also connected to the variable valve overlap device for switching between a first valve overlap suitable for the homogeneous combustion mode and a second valve overlap suitable for the stratified combustion mode. The control unit comprises an overlap switch timing control section for optimizing a switch timing of the valve overlap, so that a first timing of switching from the first valve overlap to the second valve overlap is different from a second timing of switching from the second valve overlap to the first valve overlap.

REFERENCES:
patent: 5088456 (1992-02-01), Suga
patent: 5322044 (1994-06-01), Maebashi
patent: 5727528 (1998-03-01), Hori et al.
patent: 5749346 (1998-05-01), Halvorson et al.
patent: 5797367 (1998-08-01), Iida et al.

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