Exhaust-gas temperature raising system for an in-cylinder inject

Details Exhaust-gas temperature raising system for an in-cylinder inject Exhaust-gas temperature raising system for an in-cylinder inject

1997-12-09

1999-10-19

Solis, Erick R.

Internal-combustion engines

Combustion chamber means having fuel injection only

Combustible mixture stratification means

F02B 1700

Patent

active

059671130

ABSTRACT:
An exhaust-gas temperature raising system, installed in an in-cylinder injection type internal combustion engine adapted to spark-ignite fuel injected from a fuel injection valve directly into a combustion chamber, includes an electronic control unit which controls the fuel injection valve to inject the fuel, at a delayed fuel-injection timing in a compression stroke of the engine, in such an amount as to form an overrich air-fuel mixture locally around an ignition plug together with air in the combustion chamber, when the engine is in an operating condition in which an exhaust-gas temperature is required to rise. The electronic control unit controls an engine control parameter so that the fuel injected at the delayed fuel-injection timing and spark-ignited is insufficiently combusted around the ignition plug, and is then mixed with extra oxygen in the combustion chamber so as to be combusted while being affected by a gas flow in the combustion chamber, whereby the exhaust-gas temperature is effectively raised while suppressing the fuel consumption rate to a minimum.

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