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Stratified Charge Engine

Stratified Charge Engine
The principle of stratified charge applies to direct injection petrol engines.

STRATIFIED CHARGE ENGINE

 

      The principle of stratified charge applies to direct  injection petrol engines.

 

      It involves concentrating spraying of the fuel close to the spark plug rather than throughout the whole of the combustion chamber.

 

      This method of operation delivers a reduction in fuel consumption that can reach 40% when the engine is running at very low charge.

 


 

Basic principle:

 

The principle of the stratified charge engine is to deliver a mixture that is sufficiently rich for combustion in the immediate vicinity of the spark plug and in the remainder of the cylinder, a very lean mixture that is so low in fuel that it could not be used in a traditional engine. On an engine with stratified charge, the delivered power is no longer controlled by the quantity of admitted air, but by the quantity of petrol injected, as with a diesel engine.




Homogeneous Charge Compression Ignition (HCCI)

 

        HCCI is an alternative piston-engine combustion process that can provide efficiencies as high as compression-ignition, direct-injection (CIDI) engines (an advanced version of the commonly known diesel engine) while, unlike CIDI engines, producing ultra-low oxides of nitrogen (NOx) and particulate matter (PM) emissions.


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