oil pressure and water temp gauge in one

• 2022-09-02

The electronic water temperature and oil pressure gauge has two functions of displaying the engine cooling water temperature and oil pressure. The circuit is mainly composed of water temperature sensor W, oil pressure sensor W2, integrated circuit LM339 and LED display. In the sensor field, both W1 and W2 are bimetallic. The water temperature sensor W is installed on the engine cooling water jacket, and is connected in series with the resistor to form a water temperature measurement circuit; The oil pressure sensor W2 is installed on the main shaft of the engine and is connected in series with the resistance to form an oil pressure measuring circuit.

The automobile oil pressure sensor is an important device for detecting the oil pressure of the vehicle engine. The detected data can help control the normal operation of the engine. The oil pressure sensor is installed in the main oil passage of the engine. When the engine is running, the pressure measuring device detects the oil pressure, converts the pressure signal into an electrical signal, The oil pressure of the engine is indicated by the current ratio of the two coils in the pressure indicator. After voltage amplification and current amplification, the pressure signal is compared with the alarm voltage set in the alarm circuit. When the alarm voltage is lower than the alarm voltage, the alarm circuit outputs an alarm signal and lights the alarm lamp through the alarm line.

Oil sensing plug and water temperature sensing plug are one of the common sensors in automobiles. The oil pressure sensor is a device that senses the oil pressure, and the water temperature sensor is a device that senses the coolant temperature. In fact, oil pressure sensors are common on diesel trucks. The instrument panel can intuitively display the oil pressure value, while most cars and other unrealistic oil pressure values have only one pressure indicator. Water temperature sensors are common and necessary for gasoline and diesel engines. The negative temperature thermistor has a high resistance when the temperature is low and a low resistance when the temperature is high. The temperature change causes the resistance value to change, and the current temperature of the coolant can be calculated according to the resistance value. In specific application, one end of the water temperature sensor is grounded, and the other end is output as a signal. The change in resistance value will eventually be converted into a voltage signal on the resistor R.