Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
INJECTION AMOUNT CONTROL METHOD AND DEVICE FOR SCR UREA INJECTION SYSTEM IN ENGINE
Document Type and Number:
WIPO Patent Application WO/2019/019046
Kind Code:
A1
Abstract:
An injection amount control method and device for an SCR urea injection system in an engine. The method comprises: calculating, on the basis of an amount of an injected aqueous urea solution and an amount of consumed ammonia, a current ammonia loading amount in an SCR reactor by using an ammonia loading amount model; obtaining a first urea injection amount according to a target ammonia loading amount and a current ammonia loading amount; calculating, on the basis of a catalyst temperature, an exhaust gas mass flow rate, an aging coefficient in the SCR reactor, a nitrogen oxide compound concentration upstream of the SCR reactor, and the current ammonia loading amount, a second urea injection amount by using an SCR efficiency model; combining the first and second urea injection amounts to obtain a combined urea injection amount; and obtaining, on the basis of the combined urea injection amount and a urea injection amount limit, a target urea injection amount for injection into the SCR reactor. The method accurately controls an amount of urea injected into an SCR reactor, thereby preventing urea crystallization from occurring in an engine exhaust and the SCR reactor.

Inventors:
LIANG KANGLEI (CN)
Application Number:
PCT/CN2017/094454
Publication Date:
January 31, 2019
Filing Date:
July 26, 2017
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
BOSCH GMBH ROBERT (DE)
LIANG KANGLEI (CN)
International Classes:
F01N3/20; F01N9/00
Domestic Patent References:
WO2017005348A12017-01-12
Foreign References:
CN106837488A2017-06-13
CN106837480A2017-06-13
US20040098968A12004-05-27
Other References:
See also references of EP 3660288A4
Attorney, Agent or Firm:
NTD PATENT AND TRADEMARK AGENCY LIMITED (CN)
Download PDF: