Diesel engine particle trap fault detection system and detection method thereof

Abstract

The invention discloses a diesel engine particle trap fault detection system which comprises a storage module, a DPF carbon load estimation module, a difference calculation module and a fault diagnosis module; the input end of the DPF carbon load estimation module is connected with signals of the storage module and a DPF outlet and inlet pressure difference sensor; the input end of the differencecalculation module is connected with signals of a DPF weight detection device and the DPF carbon load estimation module; and the output end of the difference calculation module is connected with a signal of the fault diagnosis module. During detection, the DPF carbon load estimation module obtains a DPF carbon load estimation value according to a detection value of the DPF outlet and inlet pressure difference sensor and through an equivalent relation of a DPF outlet and inlet pressure difference and a carbon load which are stored in the storage module firstly, then the difference calculation module calculates a difference between the estimation value and the detection value of the DPF weight detection device, and finally, the fault diagnosis module diagnoses a DPF fault type and the severity degree according to the difference. By adopting the design, rapid detection of the DPF fault type and the severity degree is realized.

Description

technical field [0001] The invention belongs to the field of filtering particulate matter of medium and heavy diesel engines, and in particular relates to a fault detection system and a detection method for a particulate trap of a diesel engine, which is suitable for realizing rapid detection of the fault type and severity of the particulate trap. Background technique [0002] Diesel particulate filter (DPF) is an effective device to solve the emission of particulate matter from diesel engines. It is a necessary and standard configuration to meet the particulate matter mass (PM) and particulate matter number (PN) in the national VI emission. Whether the DPF hardware status is normal or not directly determines the particulate matter emission of medium and heavy-duty diesel engines. Once the DPF fails but is not effectively detected, it will lead to environmental pollution and the loss of the economy and reputation of the enterprise. However, whether the DPF fails, especially ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the DPF fault cannot be quickly diagnosed in the prior art, and to provide a diesel particulate filter fault detection system and its detection method capable of quickly diagnosing the fault type and fault degree of the DPF

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