Method for diagnosing health state of liquid reducing agent supply pump
A technology of health status and diagnosis method, applied in the direction of diagnosis device of exhaust gas treatment device, pump test, liquid variable capacity machine, etc., can solve the lack of individualized diagnosis of a single product, limited application scope of diagnosis algorithm, and lack of fault predictability. and other problems, to achieve the frequency and reliability of diagnosis, overcome the strict requirements of product consistency, and improve the effect of diagnosis reliability
A technology of health status and diagnosis method, applied in the direction of diagnosis device of exhaust gas treatment device, pump test, liquid variable capacity machine, etc., can solve the lack of individualized diagnosis of a single product, limited application scope of diagnosis algorithm, and lack of fault predictability. and other problems, to achieve the frequency and reliability of diagnosis, overcome the strict requirements of product consistency, and improve the effect of diagnosis reliability
CN110925068AActive Publication Date: 2020-03-27KAILONG HIGH TECH
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[0027] The present invention will be further described below in conjunction with drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some parts related to the present invention are shown in the accompanying drawings but not the whole content. Unless otherwise defined, all technical and scientific terms used herein are related to the technical field of the present invention. The skilled person generally understands the same meaning. The terms used herein are for describing specific embodiments only, and are not intended to limit the present invention.
[0028] like figure 1 As shown, the structure of diesel engine post-treatment urea injection system components includes urea tank 11, urea suction pipe 12, urea return pipe 13, liquid reductant supply pump, that is, urea ...
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The invention discloses a method for diagnosing the health state of a liquid reducing agent supply pump. The method comprises the following steps: 101, calculating a standard control parameter threshold value in a determined health state according to the supply voltage of the supply pump under the condition that the calculation condition is met; 102, calculating a control parameter capable of representing the actual health state of the supply pump when the working state of the supply pump meets a set condition; 103, determining the actual health condition of the supply pump according to the deviation between the control parameter for the actual health condition of the supply pump calculated in the step 102 and the standard control parameter threshold value under the determined health condition calculated in the step 101; and 104, determining the cause of the failure according to the actual health condition of the supply pump and deviation of the health control parameters calculated instep 103, and reporting the cause to a supply pump control unit. The health state of the reducing agent supply pump can be monitored in real time, diagnosis is reliable, and no extra cost is needed.
Description
technical field [0001] The invention relates to the technical field of aftertreatment of internal combustion engines, in particular to a method for diagnosing the health state of a liquid reductant supply pump. Background technique [0002] Vehicle systems include vehicles powered by diesel engines. Diesel engines occupy an absolute dominance in the field of commercial vehicles due to their low fuel consumption and strong power. However, the particulate pollutants PM and toxic gas components NOx emitted by them have always been criticized. . With the continuous upgrading of diesel vehicle emission requirements in my country, selective catalytic reduction system (SCR) has become the standard configuration of diesel engine exhaust treatment system, in which the reductant supply pump plays a basic role as the core component of the SCR system, which is responsible for the liquid reductant (Ammonia water or urea) is absorbed from the storage tank, raised to the set pressure and m...
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Patent Timeline
27 Mar 2020
Publication
CN110925068A
- IPC
- F01N11/00; F04B51/00
- CPC
- F01N11/00; F01N2550/05; F01N2610/02; F04B51/00; Y02T10/40
- Inventors
- 臧志成; 曾伟