What is the working principle of an oil pressure sensor?
2 Answers
The working principle of an oil pressure sensor is: 1. The amplified pressure signal is transmitted through a signal wire to the oil pressure gauge, altering the current ratio between the two coils inside the gauge to indicate the engine's oil pressure; 2. The pressure signal, after voltage and current amplification, is also compared with the preset alarm voltage in the alarm circuit. When the signal falls below the alarm voltage, the alarm circuit outputs an alarm signal and illuminates the warning light via the alarm wire. Solutions for excessively high oil pressure include: 1. Adjusting the clearance between the shaft neck and bearing in pressure-lubricated areas; 2. Cleaning the oil pipes and passages, and maintaining the filter; 3. Selecting the appropriate oil grade; 4. Replacing the oil with one of suitable viscosity; 5. Inspecting and adjusting the pressure relief valve on an oil pump test bench to ensure the oil pressure meets specified requirements.
The working principle of the oil pressure sensor is quite interesting, let me talk about it. Simply put, it's a device that detects engine oil pressure, installed in the engine's oil passage. The core mechanism involves a diaphragm or a similar small component. When the engine oil flows, the pressure causes the diaphragm to deform. This deformation affects internal electrical components, such as causing a change in resistance. As the resistance increases or decreases, it generates a voltage signal. This signal is transmitted to the car's onboard computer or dashboard, triggering warnings like the oil pressure warning light to alert us. Low oil pressure indicates insufficient oil, which may lead to poor engine lubrication, accelerated wear, or even cylinder scoring. Therefore, this device is quite crucial as it helps us monitor the oil pressure status in real-time. While driving, if the warning light comes on, it's essential to check the oil level immediately or visit a repair shop. Continuing to drive under such conditions could potentially lead to engine failure. I recommend checking the sensor connector for looseness during every maintenance to avoid false fault alarms.
