HCCI and CAI Engines for the Automotive Industry by H Zhao

By H Zhao

HCCI/CAI has emerged as essentially the most promising engine applied sciences with the capability to mix gas potency and greater emissions functionality. regardless of the massive benefits, its operational diversity is quite restricted and controlling the combustion (timing of ignition and cost of strength free up) remains to be a space of on-going learn. notwithstanding, advertisement purposes are on the subject of truth. This ebook stories the foremost overseas learn on optimising its use, together with gas HCCI/CAI engines; diesel HCCI engines; HCCI/CAI engines with replacement fuels; and complicated modelling and experimental innovations.

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11 is that most of the reduction in (dp/dt)max is caused by the heat capacity effect. In fact, the heat capacity effect is solely responsible for the reduction in (dp/dt)max when the concentration of the burnt gases is less than 50%. The dilution effect becomes noticeable only at very high EGR concentrations. Similarly, the chemical effect becomes significant only with very high burnt gas concentrations. 2 33 Effects of hot burned gases on CAI combustion In practice, hot burned gases are preferred in most cases in order to increase cylinder charge temperature without external heating source.

2003. 30. Duffy, K. , 2003. 31. Aoyama, T. , ‘An experimental study on premixed-charge compression ignition gasoline engine’, SAE Paper 960081, 1996. 32. , ‘Development of a Gasoline Engine System using HCCI Technology – the Concept and the Test Results’, SAE Paper 2002-01-2832, 2002. 33. ’, Int. J. of Engines Research, Vol. 3, No. 4, pp 184–295, 2003. Diesel (CI) Gasoline (SI) Non-premixed air/fuel mixture Diffusion combustion CAI HCCI Premixed air/ fuel mixture Flame propagation Multiple ignition and combustion Plate 1 Salient features of three combustion modes.

Chapter 8 will present one such example on the transition between SI/CAI operations using two different valve train setups. 4 Controlling CAI/HCCI combustion As CAI/HCCI combustion cannot be directly controlled using spark ignition in a gasoline engine, the phasing and combustion rate will depend on the thermal and chemical state of the in-cylinder mixture. , SI or CAI/HCCI without the interaction by the driver, if such a combustion system is to be implemented in real world applications. In particular, there is a much higher risk of misfire in CAI operation, which will have a much more severe consequence on the engine’s performance and emissions than SI combustion.

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