Author:Â Sylvia Fang, Dr Don Law
Abstract: The total name of CAI is Controlled Auto-Ignition, which belongs to a new type of combustion that is different from traditional engines. So far, this technology has been studied by experts from all over the past 30 years. They have experimented and simulated from different aspects of combustion, and those processes and conclusions have finally published in SAE or other website and journals. Therefore, the main purpose of this paper is to read a large number of thesis that related to CAI and HCCI petrol engine, and clearly grasp CAI specific research aspects of the past 20 years, such as different experimental engine, valve strategy, operating technology, load range, emission pollution and so on. Finally, gathering their results in this paper. There will be different engine operation and software simulation steps during different CAI combustion experiments. Even with the same engine and software, different experts and researchers will operate and explore different contents and processes. This article finds that what the difference among them when so many people are studying CAI’s combustion. Different people under the study will get what kinds of results though with the same engine or simulation software (software models have already been built in enterprise). Finally, the focus of this paper is to emphasize CAI combustion technology which is only applicable on petrol engines, while HCCI is only suitable for diesel engines. The differences between them are mainly due to the realization of HCCI on diesel engine is necessary to remove the water vapor that exists in intake and residual gas by a heater, but CAI does not need, which is also the nature of diesel and petrol determine the different.
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