Untersuchungen der drallinduzierten mageren funkenunterstützten Kompressionszündung von Benzin

Autoren

S. Jian, J. Xinghong, Z. Yujia, L. Haipeng, G. Dingwei, Y. Shuhau, Great Wall Motor Co., Ltd.

Zusammenfassung

As a compromised method of HCCI, Spark Assisted Compression Ignition (SACI) has obvious advantages in engineering application. For example, to control of combustion phase, to adjust maximum pressure rise rate, so as to optimize the combustion noise and expand the operating range of the best fuel consumption. However, there are some disadvantages in SACI, such as the dependence on the last injection quality and the last injection phase. In this paper, according to the key technical requirements of SACI, an ω piston and 350 bar injection common rail pressure are adopted, the key components of combustion system are designed, and 51.8 % ITE is achieved in a single-cylinder engine with geometric compression ratio of 16, yet NOx raw emission of 7.2 g/kwh. This paper presents the design basis, main parameters and test conclusion of combustion system. Combined with the test data, the judgment method of SACI is given. For the trade-off between fuel consumption and emission, the compromised results are given. Aiming at the problem of high NOx emission, the numerical simulation method is adopted to provide the solution. That is, through a higher common rail pressure, the full development time of spray is reduced, and achieve droplets with smaller diameter, higher atomization quality, so as to reduce knock tendency, postpone the last spraying time, speed up the burning course, and reduce the negative work of combustion.

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