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Detecting method and device for removing of diesel oxidation catalyst (DOC)

An oxidation catalyst removal technology, applied in the field of DPF low-temperature active regeneration research, can solve the problems of inability to diagnose whether DOC has been removed online in real time, and poor robustness, so as to improve diagnostic robustness, prolong service life, and improve safety effect

Active Publication Date: 2019-10-01
WEICHAI POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present application provides a method and device for detecting the removal of the diesel oxidation catalyst to overcome the problem that the detection method in the prior art has poor robustness and cannot diagnose whether the DOC has been removed in real time

Method used

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  • Detecting method and device for removing of diesel oxidation catalyst (DOC)
  • Detecting method and device for removing of diesel oxidation catalyst (DOC)
  • Detecting method and device for removing of diesel oxidation catalyst (DOC)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Embodiment 1 of the present application provides a method for detecting the removal of a diesel oxidation catalyst, which is applied to a diesel engine aftertreatment system, such as figure 1 As shown, the method includes:

[0064] S101: monitor the temperature upstream of the DOC and the temperature downstream of the DOC;

[0065] Specifically, the application can monitor the temperature upstream of the DOC and the temperature downstream of the DOC in real time. By monitoring whether the temperature upstream and downstream of the DOC is within the calibration range, it can also determine whether the engine is working normally; secondly, it can detect changes in the temperature upstream of the DOC in time.

[0066] S102: When the monotonous increase or monotonous decrease of the temperature upstream of the DOC is monitored and the preset time is maintained, determine the temperature change rate upstream of the DOC and the temperature change rate downstream of the DOC at...

Embodiment 2

[0071] On the basis of Example 1, Example 2 of the present application provides a more specific method for detecting the removal of the diesel oxidation catalyst, the main process can be found in figure 1 As shown, the details will not be repeated:

[0072] In this embodiment, a judging process of monotonically increasing or monotonically decreasing temperature upstream of the DOC is provided, specifically as Figure 4 As shown, the judgment method includes:

[0073] S201: Filter the temperature upstream of the DOC to remove noise interference;

[0074] S202: Differentiate and derive the filtered temperature to obtain a temperature change rate upstream of the DOC;

[0075] S203: Determine the monotonous increase or monotonous decrease of the temperature upstream of the DOC based on the temperature change rate upstream of the DOC;

[0076] Wherein, determining the monotonous increase or monotonous decrease of the temperature upstream of the DOC based on the temperature chang...

Embodiment 3

[0097] Embodiment 3 of the present application provides another method for detecting the removal of the diesel oxidation catalyst, such as Figure 5 As shown, the method includes:

[0098] S101: monitor the temperature upstream of the DOC and the temperature downstream of the DOC;

[0099] S102: When the monotonous increase or monotonous decrease of the temperature upstream of the DOC is monitored and the preset time is maintained, determine the temperature change rate upstream of the DOC and the temperature change rate downstream of the DOC at the current moment;

[0100] S103: Based on the temperature change rate upstream of the DOC and the temperature change rate downstream of the DOC at the current moment, determine whether the DOC is removed.

[0101] S104: when it is found that the DOC has been removed, prompting through the fault indicator light.

[0102] The solution provided by Embodiment 3 of the present application can diagnose the DOC removal fault online in real...

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Abstract

The invention provides a detecting method and device for removing of a diesel oxidation catalyst (DOC). The method comprises the following steps: monitoring the temperature of the upstream of the DOCand the temperature of the downstream of the DOC; if monitoring monotonic increasing or monotonic decreasing of the temperature of the upstream of the DOC and maintaining within preset time, determining current temperature change rate of the upstream of the DOC and current temperature change rate of the downstream of the DOC; and determining whether the DOC is removed based on the current temperature change rate of the upstream of the DOC and the current temperature change rate of the downstream of the DOC. According to the scheme, the method has the advantages that the monotonic increasing ormonotonic decreasing of the upstream of the DOC is treated as the determining working condition; the detecting conditions are easily realized; the diagnostic robustness is improved; in addition, whether the DOC is removed and whether cheating occurs can be determined online in real time, thus the safety of a posttreatment system of a diesel engine can be improved; and the service lives of the engine and the posttreatment system can be prolonged.

Description

technical field [0001] This application relates to the technical field of low-temperature active regeneration of DPF (Diesel Particulate Filter, particle trap), and in particular to a method and device for detecting the removal of a diesel oxidation catalyst. Background technique [0002] Diesel Catalytic Oxidizer (DOC), as a part of diesel engine aftertreatment system, can oxidize unburned HC and CO and other pollutants in the engine. In addition, it can also oxidize NO into NO2 to improve the passive regeneration efficiency of DPF. At present, the main technical routes of diesel engines in the National VI emission stage. When the DOC in the aftertreatment system of the diesel engine is removed, the passive regeneration rate of the DPF decreases, and the regeneration of the DPF is difficult, which easily leads to adverse effects such as DPF blockage, burning, and increased user costs. [0003] At present, the detection of whether the diesel oxidation catalyst is removed is...

Claims

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Application Information

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IPC IPC(8): F01N11/00F01N3/10
CPCF01N3/106F01N11/00F01N11/002F01N2550/24Y02T10/40
Inventor 邱东褚国良胡金金王佳兴
Owner WEICHAI POWER CO LTD