Electrothermal Motor: The Ignition Factor Affected

The electrothermal engine uses a glow plug to heat the mixture.

　　The glow plug, also known as the hot hydrant and the heat head, is provided with a non-conductive insulating material between its stem and the casing, and a spring-like electric resistance wire is connected between the stem and the casing. The glow plug is mounted on the cylinder head of the engine. Before starting, the low voltage power supply is indirectly connected to the stem and the shell of the glow plug. When the current flows through the resistance wire, the resistance wire is in a red hot state, and the combustible mixture entering the cylinder is compressed when the piston rises, and the temperature rises. Adding the heat of the glow plug, the temperature of the mixture reaches the self-ignition point, so it starts to burn, generating high temperature and high pressure gas, and pushing the piston to work.

　　The power to the glow plug can be removed after the engine is started. At this time, the high temperature gas after combustion has maintained the resistance wire in a red hot state, and continues to ignite the compressed mixed gas that enters the cylinder next time.

　　The combustion of the mixed gas depends not only on the heat of the glow plug, but also on the compression of the mixture by the piston. The mixture is compressed and the temperature rises, reducing the point of spontaneous combustion. Therefore, the compression ratio of the electrothermal engine is slightly higher than that of the EDM engine. The former is 8~10, and the latter is 6~7. The compression ignition engine all relies on compression to generate heat to ignite the mixture, and the compression ratio is as high as 17~19.

　　The key to affecting ignition time

　　The    Eaton Char-lynn Motor     states that there is no means of adjusting the ignition timing on the electrothermal engine. The key factors affecting the ignition timing are fuel composition, compression ratio, compression performance and heat of the glow plug. These factors also directly affect the performance of the engine. Therefore, we must try to make these factors fit together.

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