What does engine thermal efficiency mean?

[AaliyahLee]

Engine thermal efficiency is used to evaluate the economic performance of an engine as a heat engine. Specifically, it refers to the ratio of the heat equivalent of the engine's effective power to the heat content of the fuel consumed per unit time. The following is an introduction to engine thermal efficiency: 1. Impact: The influence of engine thermal efficiency on comprehensive fuel consumption depends not only on the level of thermal efficiency but also on powertrain calibration. To reduce comprehensive operating condition fuel consumption in conventional fuel vehicles, both high thermal efficiency and excellent powertrain calibration are required. However, due to mechanical structure and working principles, the thermal efficiency of internal combustion engines has always been difficult to achieve significant breakthroughs. 2. Classification: The thermal efficiency of gasoline engines ranges between 25%-35%, diesel engines can achieve 35%-45%, and jet engines have a thermal efficiency between 50%-60%.