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An electromagnetically driven urea pump OBD diagnosis method

A technology of electromagnetic drive and diagnostic method, which is applied in the direction of diagnostic devices of exhaust treatment devices, engine components, combustion engines, etc., can solve problems such as high cost of pressure sensors, increased system costs, and difficulty in distinguishing failures of pressure build-up, etc., to achieve cost reduction effect

Active Publication Date: 2022-04-26
福爱电子(贵州)有限公司 +1
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Problems solved by technology

[0011] As mentioned above, the OBD of the existing urea metering injection system basically uses a pressure sensor, but the pressure sensor is a relatively high-cost component, which makes the system cost increase significantly
In addition, even with a pressure sensor, it is generally only possible to detect the pressure build-up failure of the urea pump, and it is difficult to distinguish which failure mode of the pump or nozzle caused the pressure build-up failure

Method used

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  • An electromagnetically driven urea pump OBD diagnosis method
  • An electromagnetically driven urea pump OBD diagnosis method
  • An electromagnetically driven urea pump OBD diagnosis method

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] For such as figure 1 The electromagnetically driven plunger metering pump and its metering system faults in the air-assisted SCR system shown in the figure, using the OBD diagnosis method of the present invention, can judge whether the metering pump is stuck, empty pump, air circuit or injection pipe by detecting T3 Jam fault.

[0035] Such as figure 1 and Figure 4 As shown, the relationship between T3 and T1 can be determined in advance when the metering pump 1 pumps liquid normally, the check valve 3, the air pipe 16, the injection pipe 6, the mixing chamber 4, the liquid outlet pipe 5 and the air-assisted nozzle 7 are also normally unblocked. , the T3 measured during each T1 operation when the pump is working should basically satisfy this predetermined relationship, as shown in the attached Figure 4 Shown in the curve L0 in. But if ther...

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Abstract

An electromagnetically driven urea pump OBD diagnosis method, which is used for OBD diagnosis of a urea pump or a urea nozzle that is driven by an electromagnetically driven pulse-type frequency modulation to adjust metering flow, and is characterized in that the control program in the urea pump control unit (DCU) includes the following steps : (1) Measure the T3 signal parameter T3M corresponding to each constant volume working pulse T1M; (2) If T3M is less than the preset constant volume critical value T3choked, then it is determined that there may be a blockage fault in the liquid outlet pipe or injection pipe; (3) Regularly measure the T3EOBD corresponding to the working pulse T1EOBD for detection; (4) If (T3M‑T3EOBD) is less than the preset slope critical value, then it is determined that there may be a sticking fault of the plunger sleeve; (5) If T3EOBD is greater than the preset empty If the critical value of the pump is exceeded, then it is determined that there may be an empty pump fault in the pump due to air resistance.

Description

technical field [0001] The invention belongs to the field of engine emission control, and in particular relates to the OBD diagnosis technology of a urea pump and a urea nozzle in an engine exhaust SCR system. Background technique [0002] With the increasingly prominent environmental problems, energy saving and emission reduction has become an endless requirement for vehicles and engines. For this reason, various countries have issued a series of vehicle emission standards, which are becoming more and more stringent. In this regard, vehicles powered by internal combustion engines need to install exhaust after-treatment systems in order to meet emission requirements. For example, SCR (Selective Catalytic Reduction) technology, which is currently mainly used for catalytic treatment of pollutants such as NOx in diesel engine exhaust, has become a necessary technology for diesel vehicles. [0003] SCR technology needs to quantitatively inject NOx reduction reactants into the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00
CPCF01N11/00F01N2900/0421Y02T10/40
Inventor 杨延相谈秉乾张平乐起奖郗大光
Owner 福爱电子(贵州)有限公司
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