著者

吉田 正武

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.64, no.617, pp.305-311, 1998-01-25 (Released:2008-03-28)

参考文献数

8

被引用文献数

1

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The author had previously reported that work done by a power stroke of 4-stroke gasoline engine is expressed as a function of engine factors (ignition timing, combustion period, heat release diagram and so on.) using an approximate pressure diagram of a cylinder, which is an approximate solution of the energy conservation equation. In this report, the author examined the effects of combustion period and heat release diagram on the work done by a power stroke. The results show that (1) the factors mentioned above have little effect on the thermal efficiency at the optimum ignition timing (MBT) ; (2) When combustion period is decreased, MBT shifts from advanced crank angle to retard crank angle in proportion to the decrease of combustion period ; and (3) The idea that a short combustion period improves thermal efficiency does not apply in the case of non-adiabatic engines.