Flow meter damaged

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Why is it easy for hot film air flow meters to break down? The core causes of hot film air flow meters are concentrated in four categories: environmental pollution erosion, improper daily maintenance and use, aging of their own characteristics, and installation and operation errors. These factors directly affect the accuracy of air intake detection, leading to problems such as insufficient vehicle power and increased fuel consumption. 1. Environmental pollutants erode the core sensing component of the hot film air flow meter, which is the hot film sensor and is directly exposed to the intake airflow for a long time. If the air filter of the vehicle ages and fails, dust, oil, and water vapor in the air will directly adhere to the surface of the hot film, disrupting the stability of heat conduction; When the crankcase ventilation system of some vehicles malfunctions, oil vapor will mix into the intake and form stubborn oil deposits on the hot film; Vehicles that are used for a long time in dust intensive construction sites, mines, or areas with severe haze will have a significantly increased probability of damage, and in severe cases, the sensing accuracy of the hot film will be completely blocked, leading to the direct scrapping of the sensor Improper daily maintenance and use are the most common causes of damage, including: - Long term failure to replace the air filter: impurities in the intake cannot be filtered, accelerating the pollution and aging of the hot film surface - Incorrect cleaning operation: Many car owners use tap water, detergent, or corrosive cleaning agents to clean the flowmeter themselves, which will damage the precision coating on the hot film surface and even cause internal circuit short circuits - Unreasonable modification: When replacing the high flow air filter or modifying the non original intake pipe without authorization, the intake flow rate may be changed or additional vibration may be introduced, causing the welding points of the hot film sensor to loosen and the induction to deviate - Long term idle working conditions: According to the automotive after-sales maintenance monitoring data released by the Ministry of Industry and Information Technology in 2023, the damage rate of the air flowmeter of long-term idle vehicles is higher than that of regular vehicles. The vehicle is 42% higher, with minimal intake during idle, and oil stains on the hot film Impurities cannot be carried away by high-speed airflow, and the accumulation speed is faster. 3. Natural aging caused by its own characteristics requires long-term electrical heating to maintain the working temperature of the hot film sensor. Continuous heating will gradually shift the resistance characteristics of the hot film and decrease its sensitivity; At the same time, the flowmeter is installed in the high-temperature engine compartment and exposed to an environment of 80-120 ℃ for a long time. The capacitors and resistors on the internal circuit board will accelerate aging and failure; In addition, when the vehicles power supply is unstable, such as battery depletion or excessive voltage fluctuations in the generator, it can directly penetrate the protective circuit of the thermal film, causing the sensor to burn out. 4. Installation and operation errors: When replacing the flowmeter or intake pipe, if the fastening bolts are tightened too tightly, it can cause deformation of the flowmeter housing and displacement of the internal thermal film sens

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