Title:
FAULT DIAGNOSIS METHOD FOR SCR UREA INJECTION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2021/213093
Kind Code:
A1
Abstract:
Provided is a fault diagnosis method for a selective catalytic reduction (SCR) urea injection apparatus, belonging to the technical field of vehicle-mounted device detection; when an automobile is moving, the method can monitor and extract the pressure of the urea solution in a liquid outlet pipe of an SCR urea spraying apparatus in real time, and compare in real time the deviation of the urea solution pressure interquartile range and the standard interquartile range in a certain detection period; by means of the statistical method, it is possible to achieve real-time fault diagnosis of the SCR urea spraying apparatus, and, in a fault state, prompt a driver of the diagnosis result in a timely manner, so as to prevent the urea solution from affecting the safety and stability of automotive travel due to the imbalance of the urea solution and the unstable pressure.
Inventors:
CHEN YIPING (CN)
HE JIAMING (CN)
CAI JIYE (CN)
HE JIAMING (CN)
CAI JIYE (CN)
Application Number:
PCT/CN2021/081603
Publication Date:
October 28, 2021
Filing Date:
March 18, 2021
Export Citation:
Assignee:
SHANGHAI SHINEROAD AUTOMOBILE TECH CO LTD (CN)
International Classes:
F01N11/00; F01N3/20
Domestic Patent References:
| WO2017211425A1 | 2017-12-14 |
Foreign References:
| CN112031903A | 2020-12-04 | |||
| CN102052133A | 2011-05-11 | |||
| CN101668931A | 2010-03-10 | |||
| CN107120164A | 2017-09-01 | |||
| CN107044322A | 2017-08-15 | |||
| DE102016117949A1 | 2017-04-27 | |||
| US20090217644A1 | 2009-09-03 |
Attorney, Agent or Firm:
SHANGHAI YUANTONG LAW FIRM (CN)
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