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DOC sulfur poisoning detection method, storage medium and system

A detection method and technology of sulfur poisoning, applied in air quality improvement, electronic control of exhaust treatment devices, diagnostic devices of exhaust treatment devices, etc., can solve problems such as not being able to detect sulfur poisoning of oxidation catalysts in time, and achieve catalytic Good effect, save time, prevent temperature instability

Active Publication Date: 2021-12-17
BEIJING FOTON CUMMINS ENGINE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is: to solve the above problems, the present invention provides a detection method, storage medium and system of DOC sulfur poisoning, by collecting the temperature at the inlet and outlet of the oxidation catalyst, and calculating the temperature rise rate to judge the oxidation catalyst. Whether there is sulfur poisoning in the converter, timely discover and remind the user to take measures to prevent greater losses, and solve the problem that there is no method for detecting sulfur poisoning in the oxidation catalyst in the EGR post-treatment system in the prior art, and the oxidation catalyst cannot be detected in time The problem of sulfur poisoning

Method used

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  • DOC sulfur poisoning detection method, storage medium and system

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Embodiment 1

[0038] see figure 1 , the embodiment of the present invention provides a kind of detection method of DOC sulfur poisoning, comprises the following steps:

[0039]Step a1: For a car with a non-SCR aftertreatment system, for example, a car with an EGR system, the exhaust pipe of the engine is equipped with DOC and DPF, and when the car leaves the factory for test operation, set the detection of DOC sulfur poisoning based on the engine regeneration cycle Time interval, wherein, at least one detection time node of DOC sulfur poisoning that does not coincide with the engine regeneration time node is set on an engine regeneration cycle, for example, the regeneration cycle of the engine is 100 hours, and the detection time interval is set to 25 hours, then the The detection time nodes of DOC sulfur poisoning of the engine are when the engine runs to 25 hours, 50 hours, and 75 hours;

[0040] Step a2: After reaching the detection time node, judge the state of the car, and test the te...

Embodiment 2

[0049] see figure 1 , the embodiment of the present invention provides a kind of detection method of DOC sulfur poisoning, comprises the following steps:

[0050] Step b1: For a car with a non-SCR aftertreatment system, for example, a car with an EGR system, the exhaust pipe of the engine is equipped with DOC and DPF, and when the car is tested at the factory, set the DOC based on the engine's running regeneration cycle sulfur poisoning The detection time interval of , wherein, at least one detection time node of DOC sulfur poisoning is set on an engine regeneration cycle, for example, the regeneration cycle of the engine is 100 hours, and the detection time interval is set to 25 hours, then the DOC sulfur poisoning of the engine The detection time nodes are when the engine runs to 25 hours, 50 hours, and 75 hours;

[0051] Step b2: After reaching the detection time node, judge the state of the car, and test the temperature at the entrance of the DOC;

[0052] Specifically, ...

Embodiment 3

[0064] The embodiment of the present invention also provides a computer-readable storage medium, such as flash memory, hard disk, multimedia card, card-type memory (for example, SD or DX memory, etc.), random access memory (RAM), static random access memory (SRAM) , read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic storage, magnetic disk, optical disk, server, App application store, etc., on which are stored computer program, when the computer program is executed by the processor, the following method steps can be realized:

[0065] Step 1: When the engine of a new car is initially running, set the detection time interval for sulfur poisoning of the oxidation catalyst based on the engine regeneration cycle, and set multiple detection time nodes for sulfur poisoning of the oxidation catalyst in one engine regeneration cycle;

[0066] Step 2: After reaching the detection time node, judge the state...

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Abstract

The invention relates to the technical field of aftertreatment of diesel engines, in particular to a DOC sulfur poisoning detection method, a storage medium and a system. The DOC sulfur poisoning detection method, the storage medium and the system are used for detecting whether sulfur poisoning exists in DOC in an aftertreatment system or not, and solve the problems that in the prior art, a DOC sulfur poisoning detection method for an EGR aftertreatment system does not exist, and DOC sulfur poisoning cannot be found in time. The method comprises the steps that an oil injector of an engine injects diesel oil into a cylinder, the diesel oil is converted into HC through incomplete combustion in the cylinder, the HC reaches a DOC inlet, the temperature T1 of the DOC inlet is collected, after the DOC catalyzes the HC, the temperature T2 of a DOC outlet is collected, the first temperature rise rate t1 of the DOC is calculated to be equal to (T2-T1) / T1, whether t1 is smaller than a preset poisoning threshold value or not is judged, and therefore whether sulfur poisoning exists in the DOC or not is judged; and DOC early sulfur poisoning is found in time, a user is reminded to take measures, and greater losses are avoided.

Description

technical field [0001] The invention relates to the technical field of aftertreatment of diesel engines, in particular to a detection method, storage medium and system for DOC sulfur poisoning. Background technique [0002] With people's high attention to improving the living environment and reducing air pollution sources, automobile exhaust is the main source of air pollution, and it is imminent to solve the problem of automobile exhaust pollution. Therefore, automobile exhaust after-treatment technology has also been well developed. Exhaust Gas Recirculation (EGR for short) system and Selective Catalytic Reduction (SCR for short) system are currently more commonly used diesel engine aftertreatment systems. EGR system refers to part of the exhaust gas discharged from the engine It is sent back to the intake manifold and enters the cylinder again together with the fresh mixed gas. The SCR system injects the reducing agent ammonia or urea under the action of the catalyst to r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F02D41/30F02D41/02
CPCF01N11/002F02D41/30F02D41/0235F02D41/028F02D41/0245F01N2430/06Y02T10/40
Inventor 马永江王照辉胡佳富
Owner BEIJING FOTON CUMMINS ENGINE
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