Mikä on autojen Common Rail -anturi

The common rail sensor for automobiles, especially the common rail pressure sensor, is a key component in diesel engines. It is responsible for accurately measuring the fuel pressure in the common rail pipe, which is necessary for the normal operation of the injection system. The following is a detailed explanation of the common rail sensor for automobiles:

1. Definition and function

• Definition: The common rail sensor, especially the common rail pressure sensor, is a sensor installed on the common rail pipe of a diesel engine, which is used to monitor and feedback the fuel pressure information in the common rail pipe in real time.
• Function: By measuring the fuel pressure in the common rail pipe, the common rail pressure sensor converts the pressure signal into an electrical signal and transmits it to the engine control unit (ECU). The ECU adjusts the injection amount and injection time of the injector based on these signals to ensure that the engine can obtain the best fuel injection effect under different working conditions, thereby improving the engine’s performance and fuel economy.

2. Working principle

The working principle of the common rail pressure sensor is based on the relationship between the deformation of the pressure sensitive element (such as the diaphragm) and the change in resistance value. When the fuel pressure in the common rail pipe changes, the pressure sensitive element will deform, causing the resistance value on it to change accordingly.

This change in resistance value will produce a voltage change in the resistance bridge. After amplification, the voltage change can be used to obtain an electrical signal corresponding to the fuel pressure.

3. Importance

• Impact on engine performance: The common rail pressure sensor is an important component of the diesel engine fuel injection system. Its accuracy and reliability directly affect the engine’s fuel injection effect and performance. If the common rail pressure sensor fails or fails, the engine will not be able to obtain accurate fuel pressure information, which will affect the normal operation of the injector. In severe cases, it may even cause the engine to fail to start or run unstably.
• Impact on fuel economy: By accurately controlling the fuel injection amount and injection time, the common rail pressure sensor helps optimize the engine’s fuel economy. While ensuring engine performance, it reduces fuel consumption and emission pollution.

4. Fault phenomenon and diagnosis

• Fault phenomenon: When the common rail pressure sensor fails, there may be fault phenomena such as difficulty in starting the engine, weak acceleration, increased fuel consumption, and excessive emissions. In addition, some advanced engine control systems will also light up the malfunction indicator light (MIL) when the sensor fails to alert the driver.
• Fault diagnosis: For fault diagnosis of common rail pressure sensor, it is usually necessary to use professional diagnostic equipment to scan and detect the engine control system. By reading the fault code and data stream information, it is possible to preliminarily determine whether the sensor is faulty and the specific cause of the fault. After confirming the sensor fault, it is necessary to replace the new sensor in time to restore the normal operation of the engine.

In summary, the common rail sensor is an important component in the diesel engine, which is of great significance to ensure the normal operation of the engine and optimize fuel economy. Therefore, in daily use, the maintenance and maintenance of the common rail sensor should be strengthened to timely discover and deal with potential fault problems.