Title:
INTERNAL COMBUSTION ENGINE SYSTEM
Document Type and Number:
Japanese Patent JP2019173708
Kind Code:
A
Abstract:
To provide an internal combustion engine system capable of suppressing degradation of NOx purification rate.SOLUTION: An internal combustion engine system includes an internal combustion engine main body, an engine electronic control unit, an urea SCR catalyst disposed on an exhaust passage of the internal combustion engine main body, an urea SCR catalyst disposed on the exhaust passage of the internal combustion engine, an urea water tank, an urea hose, an urea pump, an urea addition valve injecting the urea water so that it flows into the urea SCR catalyst, a return passage, an urea pressure sensor detecting a pressure of the urea water injected by the urea addition valve, and a fuel addition valve as an example of catalyst temperature increase means to increase a temperature of the urea SCR catalyst. When an urea estimation flow rate estimated by an estimation processing is less than a predetermined reference value in a case when a bed temperature of the urea SCR catalyst is a predetermined temperature or less, the temperature of the urea SCR catalyst is increased by the catalyst temperature increase means.SELECTED DRAWING: Figure 3
Inventors:
NAKAMURA YOSHITAKA
HASHIMOTO YOSUKE
MORI KOHEI
OMUKAI RIO
HIROOKA KENTA
HASHIMOTO YOSUKE
MORI KOHEI
OMUKAI RIO
HIROOKA KENTA
Application Number:
JP2018065038A
Publication Date:
October 10, 2019
Filing Date:
March 29, 2018
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F01N3/18; F01N3/08; F01N11/00
Attorney, Agent or Firm:
Hideki Takahashi
Mamoru Takada
Hidekazu Onishi
Mamoru Takada
Hidekazu Onishi