Urea pump pressure sensorWith the development of the logistics industry and transportation industry, the number of diesel vehicles is increasing, and the pollution of automobile exhaust is becoming more and more serious. With the implementation of the national 5 countries 6 emission standards, the greater the demand for urea pumps, the greater the demand, and the more problems, then, let's learn about it together.Urea pump pressure sensorCommon faults and maintenance methods!

The working principle and internal configuration of urea pump pressure sensor

The urea pump pressure sensor is a key component of the SCR system, known as the "urea metering pump", which is mainly used to pump the urea solution from the urea tank and deliver the urea solution to the nozzle through the pipeline.

Internal configuration of urea pump

The internal composition of the urea pump is mainly composed of diaphragm pump, electromagnetic directional valve, pressure sensor, urea filter, electric heating system, lead frame and other components. The outside is composed of three urea solution pipelines: spray, ash liquid pipe and drainage pipe.

Types of urea pump pressure sensor

There are two types of element pumps, one is the inorganic element pump represented by Bosch, and the other is the air-assisted element pump represented by IMETEK and COMINOS.

Common faults and maintenance methods of urea pump pressure sensor (taking bonded urea pump as an example)

High factor pressure

Troubleshooting: It is reported that the element pressure is high, and the return check valve is usually blocked, and a new return check valve needs to be replaced.

Urea pump pressure sensor does not absorb liquid

Troubleshooting: Urea pump does not suck mainly due to high pressure on the electromagnetic direction valve stamping caused by insufficient spring elasticity, so just remove the direction valve, replace the spring, clearly remove the check valve diaphragm under the motor. Pump friends, electrospray technology disseminators, pump friends, anything!

Common faults and maintenance methods of air auxiliary element pump (such as EMITEC element pump)

The vehicle power is insufficient, indicating that there is a problem with the instrument.

Troubleshooting: vehicle power is insufficient, running weak, generally more than the car step 5, 7, report fault. The main reason is that the NO cargo sensor readings exceed the standard, causing the axle to twist and be weak. At this time, 100 percent of people have problems in post-processing, which can basically be fixed on the NO sensor and urea pump. Test the connection between the NO sensor and the urea pump on the car, find out the problem and deal with it.

Urea pump pressure sensor does not absorb liquid

Troubleshooting: The element pump does not pump liquid, indicating that there is a problem with the element pump. At this time, we re-checked the urea pump gas stove to see if there was any problem.

The method of checking the gas stove: disassemble the main wiring harness of the car pump, connect it to the pump with the wiring harness of the equipment, and ensure that the air pressure of the car is 0.85MPa. Then click empty on the equipment. If the gas comes out, it means that there is no problem with the gas stove. If there is a problem with the gas stove, use gas to solve the problem in combination with fault 3.

The non-pumping of liquid by the Ethernet pump is often caused by a problem with the one-way valve of the Ethernet pump or a blockage of the inflow liquid. Pump friends, electrospray technology disseminators, pump friends, anything!

Urea pump pressure sensor does not eject gas

Troubleshooting: Urea pump does not eject gas. That is to say, the urea pump usually does not spray urea solution, which is mainly caused by the crystallization of the urea pump or the blockage of the air solenoid valve. Urea pump crystallization is mainly the crystallization of the gas path. Where there is a crystal painting is the air one-way valve hole and the air one-way valve crystal. Disassemble the water pump, clean the one-way valve and the small hole in the circuit with clean water, and it can be solved. The decomposition of the one-way valve everyone pay attention to it. Pump friends, electrospray technology disseminators, pump friends, anything!

The blocked part of the air solenoid valve is the return flow from the urea crystal to the air solenoid valve, and the paint pen separator is not replaced frequently, causing the air solenoid valve to be damaged or blocked.

Less urea consumption

Troubleshooting: If the element injection volume is small and the car does not have a fault code, the car is working normally at this time, so there is no need to check and deal with whether there is a problem in that place. But to find out the cause of the problem, use the equipment to detect the following places.

Whether the exhaust pipe has urea crystals; check whether the injection amount of urea pump is within the injection qualification range. Check if the sensor reading is below the normal range. Catalyst muffler, catalytic efficiency can be reduced. ECM fault

Repaired urea pump burns fuse on overalls

Troubleshooting: The larger current of EMITEC urea pump is 1.5A, test the repaired urea pump. The instantaneous current is below 1.5A and the continuous current is around 1.3A, indicating that there is no problem with the urea pump. To check whether the work clothes have short connection.

The above introduction is the common faults and maintenance methods of urea pump pressure sensor. 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.