By H Zhao
HCCI/CAI has emerged as the most promising engine applied sciences with the aptitude to mix gasoline potency and more suitable emissions functionality. regardless of the huge merits, its operational variety is very restricted and controlling the combustion (timing of ignition and fee of power liberate) remains to be a space of on-going examine. even if, advertisement purposes are with reference to fact. This ebook studies the major foreign examine on optimising its use, together with fuel HCCI/CAI engines; diesel HCCI engines; HCCI/CAI engines with replacement fuels; and complex modelling and experimental concepts.
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Additional info for HCCI and CAI Engines for the Automotive Industry
Sample text
As a result, CAI/SI hybrid operation would need to be implemented in the 4-stroke gasoline engine in order to cover the complete load and speed range of the engine, such that SI combustion could be used for very low load and high load operations whilst the CAI/HCCI combustion can be employed at low to mid-range loads. This would allow the emission and fuel consumption improvements with CAI/HCCI combustion at part-load operations while maintaining the full load engine performance using SI combustion.
14. , ‘Controlled combustion in an IC-engine with a fully variable valve train’, SAE paper 2000-01-0251, 2000. 15. , ‘Research and development of controlled autoignition (CAI) combustion in a four-stroke multi-cylinder gasoline engine’, SAE paper 2001-01-3608, 2001. 16. , ‘A four stroke camless engine, operated in homogeneous charge compression ignition mode with a commercial gasoline’, SAE paper 2001-01-3610, 2001. 17. , ‘Use of dynamic valving to achieve residual-affected combustion’, SAE paper 2001-01-0549, 2001.
This approach enables the CAI combustion at standard compression ratio without the need for external heating. There are two principal strategies for obtaining CAI combustion through the use of burned gases: (i) The first approach involves the residual gas trapping by early closure of the exhaust valve(s) and is often referred as the residual gas trapping method. Significant amounts of burned gases are kept within the cylinder after the early closure of the exhaust valves during the exhaust stroke.
