Urea pump pressure sensor: Domestic tractors have many SCR technical routes. The outstanding feature of SCR system is that ether tanks are installed on the vehicles and ether solution is stored for injecting exhaust gas. Then, let's learn about it together.Urea pump pressure sensorInternal structure and pin definition!

If the aftertreatment system fails, the ECU will reduce the injection volume to ensure that the exhaust emissions do not exceed the standard. At this time, the vehicle lacks power. This is the restriction distortion that our car owners often say. Although trucks are now implementing National VI emissions, many people are not familiar with the Ethernet post-processing system and feel very mysterious.

Most of the daily post-processing failures are caused by the post-processing spray system. Today I will introduce the internal structure of the Commins FFM board component pump and the definition of the pin.

The interior of the urea pump is actually not complicated.

The interior of the element pump is mainly composed of mixing pressure sensor, spray measuring valve, pressure sensor, return valve, element filter, lead box and other components.

The mixing chamber pressure sensor power lead is pin 6, the ground is pin 1, and the signal wire is pin 5

The resistance between 6-1 is 1K, the resistance between 1-6 is 0.87K, the resistance between 1-5 is 0.05K, the resistance between 6-5 is 0.94K, the resistance between 5-6 is 0.83K

Spray metering valve internal No. 1 needle No. 3 (black line) internal No. 2 needle No. 8 (black line) resistance between 3 and 8 is 12.7 ohms

Urea pressure sensor power lead pin 6, ground pin 1, signal wire pin 4

The resistance between 6-1 is 1K, the resistance between 1-6 is 0.87K, the resistance between 1-4 is 0.05K, the resistance between 6-4 is 1.01K, the resistance between 4-6 is 0.87K

Metering pump motor power cord 10-pin (red line) ECU internal output power supply (24V) has no fuse or relay. After the line with plug number "E" is short-circuited, ECU will be protected and powered off. The ground wire is pin 2 (black wire) and the third wire is pin 11 (pressure pulse width, sine, test lamp test, inching, motor action)

The signal wire of element temperature sensor is pin 9 (white wire) and the ground wire is pin 1 (black wire)

When the temperature is around 26, the resistance is 8.6K. The sensor is a negative temperature coefficient sensor. The higher the temperature, the lower the resistance value.

Return solenoid valve, internal pin 1, pin 13 (black wire), internal pin 2, pin 1 (black wire)

The role of compressed air is mainly to play the role of atomization, so that the urea solution through the nozzle as far as possible after atomization. The urea solution encounters high temperature in the exhaust pipe and decomposes into ammonia (NH3), which is fully mixed with the exhaust gas and enters the SCR catalytic muffler. NH3 and NOx react in the catalytic muffler to generate nitrogen and water, which are discharged into the atmosphere.

The urea solution crystallizes below -11, so vehicles driving in cold areas must defrost the heating device. The components that need to be heated are the Ethernet box, the Ethernet tube and the Ethernet pump. The Ethernet tube uses electric heating, and the Ethernet box and the Ethernet pump use engine coolant to heat.

The above introduction isUrea pump pressure sensorInternal structure and stitch definition, if you need to know more, please feel free to contact us!

Jiangmen Hengmin Intelligent Control Instrument Co., Ltd. is a pressure transmitter manufacturer, mainly engaged in oil pressure sensors, wall-mounted boiler water pressure sensors, urea pump pressure sensors, hydrogen pressure sensors, pressure calibrators, automobile pressure sensors, water pump pressure sensors, water pressure Sensors, intelligent pressure controllers, high pressure sensors and other products. Our company found in the research industry production activities that with the increasing popularity of the Internet of Things and intelligent manufacturing concepts, the demand for pressure sensors in my country has grown rapidly in recent years. In response to the needs of the era of intelligent manufacturing, our company has developed high-precision testing instruments and special production system equipment for pressure sensor manufacturers to help sensor manufacturers greatly reduce the labor intensity of testing, reduce the number of workers, improve product quality, improve production efficiency and reduce production costs.