Method and device for diagnosing an engine diesel particulate filter

Abstract

The embodiment of the invention discloses a diagnostic method and device of an engine diesel particulate filter. The diagnostic method comprises the following steps of: detecting whether a diagnosticinstruction is received, and whether the operation condition of a whole vehicle meets the burning diagnostic condition of a diesel particulate filter (DPF); and if the diagnostic instruction is received and the operation condition of the whole vehicle meets the burning diagnostic condition of the DPF, adjusting the operation data of an engine as the diagnostic operation data so as to carry out burning diagnosis on the DPF. The embodiment of the invention realizes the burning diagnosis testing of the DPF, can prevent the vehicle from frequently executing the DPF to burn the diagnosis process, reduces the operation power consumption of an electronic control unit integrated with a diagnostic device, also can also prevent the user from mistakenly inputting the diagnostic instruction, improve the safety of the whole vehicle, enables the user to accurately judge the condition of the whole vehicle and timely treat problems, avoids greater losses, provides very good convenience for the maintenance and curing of the whole vehicle and saves workload for after-sales service workers.

Description

technical field [0001] Embodiments of the present invention relate to engine technology, and in particular to a method and device for diagnosing an engine diesel particulate filter. Background technique [0002] In recent years, with the continuous improvement of diesel engine emission standards, whether exhaust gas recirculation technology or selective catalytic reduction technology is adopted in the treatment of exhaust gas by modern diesel engine vehicles, the exhaust after-treatment device is Diesel Particulate Filter (Diesel Particulate Filter) , DPF) have become a necessary device for the development of diesel vehicles. [0003] DPF is simply a control unit for exhaust gas treatment to capture carbon particles in exhaust gas. DPF includes a regeneration program, that is, when the particulate matter captured in the DPF reaches a certain condition during driving, the vehicle will automatically start the DPF regeneration program to fully burn the particulate matter in th...

AI Technical Summary

Problems solved by technology

[0004] During the DPF regeneration process, if the temperature gradient of the carrier in the DPF is too large, it will easily cause the DPF to burn out. After the DPF burns out, the efficiency of capturing carbon particles will drop sharply, and the possibility that the content of harmful substances in the exhaust gas will exceed the emission standard will be greatly increased.

However, in the prior art, it is impossible to perform fault diagnosis on DPF burnout, so the fault diagnosis on DPF burnout has become a problem to be solved at present.

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