The working principle of the preheater plug of the automobile
The working principle of automobile preheating plug is mainly based on electric heating effect . The preheat plug is connected to the engine control unit (GCU) conductor side connector to provide electrical energy for the electric heat plug. After receiving the electric energy, the electric heating wire inside the electric plug will heat up rapidly, and transfer the heat energy to the air in the combustion chamber of the diesel engine , thereby increasing the air temperature, making the diesel oil more easily ignited, and improving the cold starting performance of the diesel engine.
The main function of preheating plug
The main function of the preheat plug is to provide heat energy while the diesel engine is cooling to improve the starting performance. In order to achieve this purpose, the preheating plug needs to have the characteristics of rapid heating and continuous high temperature. When the diesel engine is in a cold environment, the preheat plug can provide heat energy and help improve the starting performance.
Characteristics and test methods of preheating plugs
When testing the working condition of the preheat plug, the technician will connect the test lamp to the terminal G1 of the GCU conductor side connector, and then disconnect the cable from the power connector of the 1-cylinder electric heat plug. Then turn on the ignition switch, if the test light is on normally, it indicates that the preheat plug system is working normally. In addition, the design of the preheat plug needs to take into account its heating rate and the persistence of the high temperature state to ensure that the diesel engine can start normally.
The main impact of damage to the car preheat plug
Engine hard to start : The main function of the preheat plug is to provide extra heat to the engine in a low temperature environment to help it start smoothly. If the preheat plug is damaged, the engine may not reach its normal operating temperature when starting, resulting in difficulty or inability to start.
performance decline : even if the engine is barely started, it may be because the temperature is too low, resulting in insufficient combustion of the mixture, so that the performance of the engine is significantly reduced.
increased fuel consumption : Due to inadequate combustion, the fuel consumption of the engine may increase, thus increasing the operating costs of the car.
abnormal emission : damage to the preheat plug may lead to excessive harmful substances in the exhaust gas emitted by the engine, such as carbon monoxide, hydrocarbons, etc., which will pollute the environment and may affect driving safety.
shorten engine life : long-term operation in this state will cause serious damage to the engine, and may even lead to the early scrapping of the engine.
Specific symptoms of preheating plug damage
difficulty starting the engine : in cold weather, damage to the preheat plug can make it difficult to start the car.
underpower : Damage to the preheat plug may result in reduced engine performance and reduced power.
Increased fuel consumption : Increased fuel consumption may result from engine failure to function properly.
abnormal emission : Damage to the preheat plug may result in excessive harmful substances in the exhaust gas emitted by the engine.
Dashboard Warning light on : Some cars are equipped with a preheat plug control system that may sound an alarm via a warning light on the dashboard when the system detects a preheat plug failure.
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