Automotive electronic instrument coolant temperature gauge, oil pressure gauge circuit diagram
In order to understand and master the working condition of the car engine, timely discover and eliminate possible faults, the car is equipped with a car engine coolant temperature gauge and an oil (lubricating oil) pressure gauge. The circuit shown in Figure 6-38 has two functions: engine coolant temperature and oil pressure. It mainly consists of coolant temperature sensor w1 (thermistor type), oil pressure sensor w2 (bimetal resistor type), lm339 integrated circuit and red, yellow and green LED display. The coolant temperature sensor is installed in the water jacket of the engine, and it forms a coolant temperature measuring circuit with the resistor r11. The oil pressure sensor is mounted on the main oil passage of the engine, and the resistor r18 constitutes an oil pressure measuring circuit. The following diagram shows the circuit diagram of the automotive electronic instrument coolant temperature gauge and oil pressure gauge:
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