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Title:
EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP2015034498
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To intermittently inject the necessary amount of hydrocarbon for preventing clogging with an electric pump stopped.SOLUTION: An internal combustion engine includes: a hydrocarbon supply valve(15) disposed within an engine exhaust passage; and an electric pump (60) for supplying hydrocarbon to the hydrocarbon supply valve (15). Normally, the injection pressure of the hydrocarbon supply valve (15) is maintained to target injection pressure by the electric pump (60). During an engine operation, when a request to stop the electric pump (60) is made, the electric pump (60) is stopped. Even in this case where the electric pump (60) is stopped, until the injection pressure of the hydrocarbon supply valve (15) is reduced to equal to or lower than predetermined allowable injection pressure that is lower than the target injection pressure, the necessary amount of hydrocarbon for preventing clogging is intermittently injected with the electric pump (60) stopped.

Inventors:
MISAIJI YUKI
YOSHIDA KOHEI
Application Number:
JP2013165350A
Publication Date:
February 19, 2015
Filing Date:
August 08, 2013
Export Citation:
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Assignee:
TOYOTA MOTOR CORP
International Classes:
F01N3/08; B01D53/86; B01D53/94; F01N3/36
Domestic Patent References:
JP2011149366A2011-08-04
JP2006122878A2006-05-18
JP2008002426A2008-01-10
JP2012087629A2012-05-10
JP2013050100A2013-03-14
JP2011149366A2011-08-04
JP2006122878A2006-05-18
JP2008002426A2008-01-10
JP2012087629A2012-05-10
JP2013050100A2013-03-14
Foreign References:
US20090192732A12009-07-30
US20090192732A12009-07-30
Attorney, Agent or Firm:
Aoki 篤
Tsuruta Junichi
Tetsuro Shimada
Mitsuhashi Shinji
Koichi Ito
Yuichi Morimoto



 
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