A diagnostic method and storage medium for an engine particle trap

Abstract

The invention relates to the technical field of on-board diagnosis, in particular to a diagnosis method and a storage medium for an engine particle trap. Start the engine and enter the diagnosis process; after monitoring that the intake flow rate of the particle filter reaches the calibration value qt, the outlet flow data of the particle filter is continuously collected within one driving cycle to obtain the n of the particle filter Group outlet flow data q1~qn; calculate the average value of n groups outlet flow data q1~qn to get the average outlet flow q avg ; The average outlet flow q avg With the pre-calibrated particulate filter blockage judgment threshold q min and particle filter removal judgment threshold q max Compare; output diagnostic results. The diagnosis result is not affected by the icing of the differential pressure pipeline, and there is no need to add the judgment logic of the icing of the pipeline, the diagnostic logic is simple, and the development cost is low.

Description

technical field [0001] The invention relates to the technical field of on-board diagnosis, in particular to a diagnosis method and a storage medium for an engine particulate trap. Background technique [0002] The principle of the current mainstream particle filter diagnostic system is to add a differential pressure pipeline at the inlet and outlet of the particle filter, and monitor the change of pressure difference to reflect the state of the particle filter, so as to identify the blockage and removal of the particle filter. Wait for the failure performance. However, this method has certain disadvantages. For example, in the cold winter in the north, the differential pressure pipeline usually faces the problem of freezing of the pipeline, which affects the accuracy of diagnosis. In order to ensure the accuracy of the diagnosis, it is necessary to add a logic structure such as the judgment of the icing of the differential pressure pipeline, which makes the diagnosis logic ...

AI Technical Summary

Problems solved by technology

However, this method has certain disadvantages. For example, in the cold winter in the north, the differential pressure pipeline usually faces the problem of freezing of the pipeline, which affects the accuracy of diagnosis.

In order to ensure the accuracy of the diagnosis, it is necessary to add a logic structure such as the judgment of the icing of the differential pressure pipeline, which makes the diagnosis logic complicated.

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