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oil pressure gauge needle shaking
Reasons why the pointer of the oil pressure gauge swings a lot:
1. The oil pressure of the engine is unstable. First check whether there is any problem with the oil pressure sensor, line contact, etc., then check whether the oil pump is damaged, and finally check whether the oil circuit is blocked;
2. The viscosity of the engine oil is too low; the filter screen of the oil filter or the filter element of the oil filter is blocked;
3. The elastic force of the pressure limiting valve and the oil return valve spring is weakened or broken, or the joint surface of the valve is not tightly sealed, resulting in oil leakage and pressure relief;
4. The main bearing or connecting rod bearing clearance is too large;
5. The oil pump is not working well.
The sensor of the oil pressure gauge is a piezoresistive sensor. It is fixedly connected to the engine oil pipeline with threads. The pressure of the engine oil pushes the contact piece to move on the resistor, which changes the resistance value and affects the amount of current passing through the instrument to the ground. Drive the pointer to swing. Since the oil pressure has a certain pressure range, for clarity. At present, the oil pressure gauges of many cars are indicated by indicator lights. It stays on if the engine is running. It means that the engine lubrication system may not be normal.
The automotive oil level sensor can float on the surface of the oil layer. Using the principle of leverage, the other end of the float is a potentiometer. The amount of oil determines the height of the float. The potentiometer at the other end will reach different potentials with the oil level. displayed above. The principle of the automotive oil level sensor is a wire-wound resistor, the resistivity is determined by the resistance wire material, and the resistance value is determined by the number of turns of the material resistivity coil. Therefore, the stable performance of the wirewound resistor is the first choice for the long-term use of the automotive oil quantity sensor. The oil quantity sensor adopts wire-wound resistors with small wire diameter, high resistance value and dense arrangement, which have the characteristics of stable performance, reliable structure and high resolution.
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