Diagnosis method of dpf differential pressure sensor fault of diesel engine

A diagnostic method, DPF technology, which is applied to the diagnostic devices of exhaust treatment devices, machines/engines, instruments, etc., can solve the problems of poor detection effect and reduce the impact

Active Publication Date: 2020-03-17
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, the detection methods in the prior art have poor detection effect on the above problems.

Method used

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  • Diagnosis method of dpf differential pressure sensor fault of diesel engine
  • Diagnosis method of dpf differential pressure sensor fault of diesel engine
  • Diagnosis method of dpf differential pressure sensor fault of diesel engine

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Embodiment 1

[0029] This embodiment provides a diagnostic method for a diesel engine DPF differential pressure sensor failure, which includes dynamic failure detection, blocking failure detection, and reverse connection failure detection, so that by the diagnostic method for a diesel engine DPF differential pressure sensor failure of the present invention, The failure of the DPF differential pressure sensor caused by sensor aging, blockage of the upstream intake pipe of the DPF, and reverse connection of the air intake port can be detected in time, thereby greatly reducing the impact on DPF particle capture and DPF regeneration when the differential pressure sensor fails.

[0030] In this embodiment, the dynamic failure fault detection includes:

[0031] Start dynamic failure fault detection;

[0032] When the exhaust gas volume flow is greater than a certain value, such as greater than 70m 3 / h, execute the next step;

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Abstract

The invention discloses a diesel engine DPF differential pressure sensor fault diagnostic method. The method comprises dynamic failure fault detection, blocking failure fault detection and reverse connection failure fault detection. According to the invention, the diesel engine DPF differential pressure sensor fault diagnostic method can timely detect DPF differential pressure failure faults caused by sensor aging, DPF upstream intake-tube blocking and intake port reverse connection, and the influence of sensor failure faults on DPF particle capturing and DPF regeneration can be greatly reduced.

Description

technical field [0001] The invention relates to a fault diagnosis method of a diesel engine DPF differential pressure sensor, and belongs to the field of diagnosis strategy development of an engine electronic control system. Background technique [0002] As the implementation date of the national VI emission regulations for diesel engines is approaching, DPF will be more and more widely used in the aftertreatment system of diesel engines, and the differential pressure sensor of DPF, which is closely related to the capture efficiency and regeneration strategy of DPF, plays an important role. [0003] The DPF differential pressure sensor has conventional fault detection and removal detection control algorithms, but when the sensor value falls within the normal range, it is difficult to detect the reliability of the value, such as the sensor value offset due to sensor aging, Or the sensor value is inaccurate due to improper operation during installation. Being able to detect s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00
CPCG01L27/007Y02T10/40
Inventor 于凯吕颖郭斌张鹏任灵童陈铁
Owner CHINA FIRST AUTOMOBILE
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