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目前,国内流行的一些非物理专业的普通物理版本对奥托内燃机工作过程的分析不甚详尽,甚至在一些影响较大的教材中,在相当长的一段时间内始终存在某些叙述性或概念性的模糊、混淆之处,容易使学生造成误解。本文试图对奥托循环中一些容易混淆之处进行某些澄清,文中强调了工程上常用的示功器图与热力学中描述定质量的热力学系统状态参量关系的P-V图之间的本质区别,对奥托内燃机工质状态变化过程进行了简单分析,并引入了理想奥托循环。最后指出,为了行文简洁可以在P-V图上直接引
At present, the analysis of the working process of Otto internal combustion engines by the common nonphysics general physics versions in China is not exhaustive. Even in some influential textbooks, there are always some narration or concepts in a long period of time Blurred, confusing, easy to make students misunderstand. This paper attempts to make some clarifications on some of the confusing places in the Otto cycle, highlighting the essential differences between PV diagrams commonly used in engineering and PV diagrams describing thermodynamic system states of constant mass in thermodynamics, Otto internal combustion engine working conditions of the state of a simple analysis, and the introduction of the ideal Otto cycle. Finally pointed out that in order to concise language can be directly cited in the P-V map