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Experimental Study on Combustion Characteristics and Load Expansion of Gasoline HCCI Engine Based on the OKP Technology

Author: ZhangXuZhou
Tutor: HuangZhen
School: Shanghai Jiaotong University
Course: Power Machinery and Engineering
Keywords: Homogeneous charge compression ignition ( the HCCI ) To optimize motivation technical (OKP) Cyclic variation Mode switching Load to expand
CLC: TK401
Type: Master's thesis
Year: 2012
Downloads: 37
Quote: 0
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Abstract


Faced with the dual challenges of the energy situation and environmental protection, improve engine thermal efficiency and lower emissions has become one of the main ways of coping. Homogeneous Charge Compression Ignition (HCCI) as a possible alternative to the traditional combustion mode, a third engine clean and efficient combustion mode showed a great deal of potential. HCCI also facing its own challenges, that fire phase control and load development issues, which optimize power technology (OKP) as a technical means to achieve HCCI combustion gasoline engine, in these two aspects reflect certain advantages. Therefore, OKP technology for gasoline HCCI engine combustion characteristics and load expand the pilot study. 1.5L four-cylinder gasoline engine based on the OKP technical principle, a Taiwanese business transformation, while the completion of the design and construction of a test bench system to achieve a stable gasoline HCCI combustion. In order to study the combustion characteristics of gasoline HCCI, the statistical analysis of the SI-HCCI switching point, SI and HCCI mode is the same as the cycle changes in characteristics between the cylinder and the cylinder under load analysis limited HCCI limit the expansion to the high load conditions and solve way. The results showed that: 1400rpm when switching the point load the appropriate increase in the HCCI combustion is more stable to the switching; same load HCCI each cyclic variation of the combustion parameters is significantly less than the SI, indicated mean effective pressure (IMEP) cyclic variation in cylinder less than 2.5%, the cyclic variation of less than 3% in the cylinder; HCCI mode, the combustion in the respective cylinders between regularity differences. Explore pure OKP-based technology HCCI combustion load range, and discussion Characterization HCCI load and lower bounds on the parameters. Effects of exhaust gas recirculation (EGR) and booster (Boost) HCCI combustion characteristics of the engine. Experiments show that: increasing the EGR rate alone combustion phase postpone, combustion duration, while the CO and HC emissions increased significantly with the increase in the EGR rate; while in the case of a substantially constant air-fuel ratio, separately increase the intake pressure, ahead of the combustion phase, the combustion duration is shortened, the CO and HC emissions are somewhat smaller as the supercharging pressure increases. EGR and supercharging NOx emissions are at a low level. Combination of EGR and supercharging to expand the load range of HCCI, results showed that the HCCI load to low load and high load has been expanded, certain speed has been reached for about 60% of the corresponding load of the original machine, the combustion efficiency is much higher than gasoline engine, the lowest effective fuel consumption rate reached 230g/kW.h NOx emission substantially at a very low level (lt; 60ppm), CO and HC emissions have increased. Finally, analysis of the load to expand the distribution of the combustion parameters, and found that if you improve the strength of the engine can further expand the load range of HCCI.

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CLC: > Industrial Technology > Energy and Power Engineering > Internal combustion engine > General issues > Theory
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