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• W800996438 abstract "The paper concerns the direct injection in SI internal combustion engines by compressed natural gas in order to decrease the global CO2. The increase of the working parameters of the spark ignition engines in comparison to the diesel engines would be done by applying a high charge pressure and with direct injection of CNG for two modes with the homogenous charge and stratified charge. Decreasing of NOx emission is possible by fuelling the engine by lean mixtures ( = 1.2 1.6). Ignition of the mixture at high compression pressure above 40 bars requires applying of a strictly defined dose of gas fuel. Sparking of the high compressed mixture can be done only by high voltage ignition system. The paper describes the total problems of injection, ignition and combustion CNG in high compressed spark ignition engines with simulation results in one-cylinder fourstroke SI engine. There are also compared the test and calculation results in the caloric chamber. The paper gives dependences of compression ratio and air-fuel ratio for lean burning of CNG. 1. Development of IC engines fuelled by natural gas Recently in automotive industry the applying of compressed natural gas in the spark ignition internal combustion engines is more real than never before. There are known many designs of the diesel engines fuelled by the natural gas, which is injected into inlet pipes. Because of the bigger octane number of the natural gas the compression ratio of SI engines can be increased, which takes effect on the increase of the total combustion efficiency. However in diesel engines the compression ratio has to be decreased for homogeneity of the mixture, which flow into the cylinder. Such mixture cannot initiate the self-ignition in traditional diesel engines because of higher value of octane number. Direct injection of the compressed natural gas besides of the defined dose of the fuel delivered by the injectors requires also high energy supplied by the ignition systems. A natural tendency in the development of the piston engines is an increase of the air pressure in the inlet systems by applying of high charge level by applying of a turbo-charging or mechanical charging. The high engine charging causes a higher compression pressure during the moment of sparking and also the higher temperature. The liquid form of CNG requires the storage temperature near -162 C and much heat to vaporization after direct injection from the cylinder charge. Naturally aspirated SI engine fuelled by the natural gas has lower value of thermodynamic efficiency than diesel engine. The experiments conducted on SI engine fuelled by CNG with lean homogeneous mixtures ( 1.4) show that in many cases it causes a faulty ignition and for this reason the better solution is the concept of the stratified charge with CNG injection during the compression stroke. The world automotive corporations have worked on a new direct injection of compressed natural gas in spark ignition engines with high charging bigger than in diesel engines. It is assumed that charging ratio reach value about 2.5 which is not met" @default.
• W800996438 created "2016-06-24" @default.
• W800996438 creator A5074760791 @default.
• W800996438 date "2005-01-01" @default.
• W800996438 modified "2023-09-24" @default.
• W800996438 title "Ignition and combustion process in high charged SI engines with direct injection of CNG" @default.
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