What are the common contents of the car dashboard

1. Oil pressure gauge

The oil pressure gauge is an instrument that displays the oil pressure, in kPa (kPa). The oil pressure gauge sensor is a piezoresistive sensor, which is fixedly connected to the engine oil pipeline with threads. The oil pressure pushes the contact plate to move on the resistance, which changes the resistance value and thus affects the amount of current passing through the instrument to the ground, driving the pointer to swing. Because the oil pressure has a certain pressure range, for clarity, the oil pressure gauge of many cars is indicated by an indicator light. If it is still on when the engine is running, it means that the engine lubrication system may be abnormal.

2. Water temperature gauge

The water temperature gauge is an instrument that displays the temperature of cooling water, in ℃ (Celsius). Its sensor is a thermistor type sensor, which is fixed on the engine cooling water channel with threads. The thermistor determines the current flowing through the coil winding of the water temperature meter, thus driving the pointer of the meter to swing. In the past, the cooling water of automobile engines was used as tap water. Many automobile engine cooling systems used special coolant, so it is also called coolant thermometer.

3. Fuel gauge

The fuel gauge is an instrument that shows the amount of fuel in the tank, in L (liter). The pointer points to "F", indicating full fuel, and to "E", indicating no fuel; 1/1, 1/2 and 0 are also used to indicate full oil, half tank oil and no oil. There are two coils in the fuel gauge, respectively on the "F" and "E" sides. The sensor is a variable resistance controlled by the float height. The change of resistance value determines the magnetic line strength of the two coils, and also determines the deflection direction of the pointer.

4. Water temperature gauge and fuel gauge

The water temperature gauge and the fuel gauge are also indicated by the indicator light. The water temperature indicator light on indicates that the water temperature is high, and the fuel indicator light on indicates that the fuel is near the low point, as an auxiliary reminder.