Judgment method, device, system and readable medium for vehicle urea consumption deviation

Abstract

The invention provides a method, device, system and readable medium for judging the deviation of urea consumption in a vehicle, including obtaining the actual consumption of urea, the mileage of urea consumption in the driving cycle, and the urea consumption in the driving cycle for each vehicle driving cycle. The required consumption; obtaining the accumulated urea consumption mileage and the accumulated urea required consumption; judging the difference between the accumulated urea consumed mileage and the accumulated urea demanded consumption and the preset threshold and judging the vehicle urea consumption deviation based on the difference. The invention provides more reliable and high-confidence urea consumption deviation judgment, avoids misjudgment of liquid level due to road surface, driving, and liquid level sensor errors, and improves the accuracy of urea consumption deviation diagnosis. Through the calculation of the deviation between the actual consumption of the vehicle and the required consumption, the urea consumption can be grasped in time, and the alarm can be issued based on the deviation judgment of different dimensions, and the inspection and maintenance can be guided.

Description

technical field [0001] The invention relates to the technical field of automobile emission control, in particular to a method, device, system and readable medium for judging urea consumption deviation. Background technique [0002] In the National VI emission regulations, more data monitoring requirements are put forward for light-duty and heavy-duty diesel engines using SCR technology. SCR (Selective Catalytic Reduction System) is a common technology for eliminating nitrogen oxides in exhaust gas. Injection, atomization, evaporation, the hydrolysis of urea and the mutual chemical reaction of pyrolysis gas, as well as the catalytic surface chemical reaction between NOx and NH3 on the catalyst surface, have the purpose of reducing nitrogen oxides in the exhaust emission of light and heavy diesel engines, among which urea The abnormal consumption deviation of the aqueous solution in the chemical reaction will cause deviation or misjudgment in the vehicle control system equippe...

AI Technical Summary

Problems solved by technology

[0002] In the National VI emission regulations, more data monitoring requirements are put forward for light-duty and heavy-duty diesel engines using SCR technology. SCR (Selective Catalytic Reduction System) is a common technology for eliminating nitrogen oxides in exhaust gas. Injection, atomization, evaporation, the hydrolysis of urea and the mutual chemical reaction of pyrolysis gas, as well as the catalytic surface chemical reaction between NOx and NH3 on the catalyst surface, have the purpose of reducing nitrogen oxides in light and heavy diesel engine exhaust emissions. Among them, urea The consumption deviation of aqueous solution in the chemical reaction is abnormal, which will cause deviation or misjudgment in the vehicle control system equipped with light or heavy diesel engine in the process of vehicle monitoring

[0003] The common abnormal monitoring of urea consumption is based on the urea liquid level signal to calculate the actual urea consumption. In the existing technology, through the OBD remote supervision terminal, the monitoring information of the target vehicle urea sensor on the liquid level signal is collected to obtain the dynamic operating parameters of the vehicle. , to diagnose urea consumption, when the urea consumption exceeds a certain threshold, it is determined that the urea consumption is too low. There is a large deviation in itself, and it is inevitable to cause misjudgment when comparing with the average value to judge the fault

[0004] When the vehicle monitors urea, the vehicle control system usually uploads and reads data through the ECU, controls the monitoring and data transmission of vehicle urea consumption through the remote system, and receives the urea consumption data installed on different vehicles to realize urea monitoring and management Services, remote data transmission and integration of diesel vehicles, higher consumption costs

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