Diagnosis method, device, equipment and storage medium of urea thawing ability

Abstract

Embodiments of the present invention provide a diagnostic method, device, equipment, and storage medium for urea thawing ability. The method obtains the first heat generated by the engine within a unit time for urea thawing after the engine reaches a predetermined working condition; The second heat required for complete thawing of urea in the tank; according to the first heat and the second heat, obtain the thawing time; when the time reaches the thawing time, diagnose whether the urea is thawed, and give a fault prompt according to the diagnosis result . In this embodiment, when the theoretical heat generated by the engine for urea thawing is in balance with the heat theoretically required for the complete urea thawing in the urea tank, the diagnostic logic is released to diagnose the urea thawing ability, which can accurately reflect the urea thawing ability Whether it is normal or not, to avoid diagnosing when the thawing system is working normally but the urea has not been thawed will cause an error to be reported and mislead the maintenance personnel.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of diagnosing urea thawing ability, in particular to a diagnosing method, device, equipment and storage medium for urea thawing ability. Background technique [0002] At present, some diesel vehicles use urea for exhaust gas treatment. Since the freezing point of urea for vehicles is minus 11 degrees Celsius, the urea in the urea tank is easy to freeze after the vehicle is left standing for a long time in cold winter, and the urea pump cannot build pressure when it is restarted. For jetting, the aggressive type of urea needs to be thawed first. The urea is thawed mainly by heating the engine coolant. It is necessary to monitor whether the urea thawing can be successful in the vehicle requirements of the National VI diesel engine. The thawing ability of urea directly affects the exhaust emissions of diesel vehicles. [0003] In the prior art, the detection of whether the urea is thawe...

AI Technical Summary

Problems solved by technology

[0004] In the time-based urea thawing detection method in the prior art, it often occurs that the thawing system is in a normal working state, but the urea has not been thawed when the detection time is reached, and a vehicle failure is reported, resulting in the frequent failure of the vehicle and false reporting. misleading maintenance personnel

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