Predictive maintenance system and method for SCR (Selective Catalytic Reduction) urea injection system

Abstract

The invention discloses a predictive maintenance system and method for an SCR (Selective Catalytic Reduction) urea injection system. The predictive maintenance method comprises the following steps of:periodically collecting the urea injection volume and urea pressure of the SCR system; judging whether the current urea pressure is selected according to the current urea injection volume; comparingthe selected urea pressure within a certain period of time with a threshold value; and determining different maintenance service plans according to different comparison results; and determining whether a maintenance service appointment is made according to the maintenance service plan. The predictive maintenance system monitors the status of the urea injection system in real time, including various abnormalities such as blocking and leakage. When the system is found to deviate from the normal running status, the information is transmitted to the cloud through a vehicle-mounted platform; afterthe cloud performs information analysis and processing, and the terminal notifies a vehicle user of the information of the urea injection system; and the vehicle user can make the maintenance serviceappointment through the terminal for eliminating the system abnormalities, thereby reducing the frequency of occurrence of failures, the chain reaction caused by failures and the maintenance cost.

Description

technical field [0001] The invention belongs to the technical field of automobiles, and in particular relates to a predictive maintenance system and method for an SCR urea injection system. Background technique [0002] In order to reduce the emission of NOx pollutants in the engine exhaust, a selective catalytic system (SCR) will be installed on the engine. The SCR system injects urea solution into the exhaust gas, which is gasified and decomposed to form NH3. NH3 and NOx gas are generated by the reaction in the catalyst. Harmless N2 and water. When the urea SCR system is applied in the market, the following problems are likely to occur: urea nozzle blockage, urea pump leakage, urea injection pipe rupture, etc. When these problems occur, urea cannot be injected into the exhaust gas normally, and NOx cannot be converted, resulting in vehicle NOx emissions exceed limit values. Vehicles currently on the market only diagnose faulty systems, and cannot identify those systems t...

AI Technical Summary

Problems solved by technology

When the urea SCR system is applied in the market, the following problems are likely to occur: urea nozzle blockage, urea pump leakage, urea injection pipe rupture, etc. When these problems occur, urea cannot be injected into the exhaust gas normally, and NOx cannot be converted, resulting in vehicle NOx emissions exceed the limit

[0005] The existing patents have the following disadvantages: 1. Only identify the nozzle clogging fault in the SCR urea injection system, but cannot identify system leakage and normal decompression faults

2. The preventive measures for the blockage of the SCR urea injection system cannot monitor the system in real time, and the fault cannot be dealt with in time

3. The abnormal state of the vehicle SCR urea injection system cannot remind the driver in time, and there is no spare parts reservation function

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