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difference between oil pressure switch and oil pressure sensor

The difference between oil pressure switch and oil pressure sensor


The oil pressure switch is used to detect the oil pressure of the engine, and is composed of a diaphragm, a spring and a contact.The oil pressure indicator is installed in the instrument cluster, and the pressure switch is installed on the engine Lubricating oil pipeline. Diaphragm and contact are operated by hydraulic pressure.When the oil pressure is lower than the specified value, the diaphragm does not have the force to push the spring, then the contact is closed and the indicator light is on;When the oil pressure is higher than the specified value, the diaphragm pushes up the spring, the contacts are separated, and the indicator light goes out. At this time, the driver should know that the oil pressure has reached the specified value.Under normal circumstances, the contact operating pressure range is 30-50kPa.

 

The signal gave by oil pressure switch is on-off signal.The sensor provides an analog signal


The electronic oil pressure sensor is composed of a thick film pressure sensor chip, a signal processing circuit, a housing, a fixed circuit board device, and 2 leads (signal line and alarm line).The signal processing circuit is composed of a power supply circuit, a sensor compensation circuit, a zero-adjusting circuit, a voltage amplifying circuit, a current amplifying circuit, a filter circuit, and an alarm circuit.

The oil pressure sensor is installed on the main oil line of the engine,When the engine is running, the pressure measurement device detects the pressure of the engine oil, converts the pressure signal into an electrical signal and sends it to the signal processing circuit. After voltage amplification and current amplification, the amplified pressure signal is connected to the oil pressure indicator through the signal line to change The ratio of the current passing through the two coils in the oil pressure indicator to indicates the engine oil pressure.The pressure signal after voltage amplification and current amplification will also compared with the alarm voltage set in the alarm circuit. When the voltage is lower than the alarm voltage, the alarm circuit outputs an alarm signal and lights the alarm lamp through the alarm line.

The wiring method of the electronic oil pressure sensor is completely the same as that of the traditional mechanical sensor. It can replace the mechanical pressure sensor and be directly connected to the car oil pressure indicator and low pressure alarm lamp to indicate the oil pressure of the diesel car engine and provide a low pressure alarm signal.Compared with the traditional piezoresistive oil pressure sensor, the electronic automobile oil pressure sensor has the advantages of no mechanical moving parts (ie no contact), high accuracy, high reliability, long life, etc., and meets the requirements of the development of automotive electronics .

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