Title:
SECONDARY AIR SUPPLY DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
Japanese Patent JP2009138529
Kind Code:
A
Abstract:
To provide a secondary air supply device capable of preventing deterioration of exhaust emission even when an air pump is frozen.
In this engine system, when a frozen state of the air pump 50 supplying secondary air to a catalyst 32 arranged in an exhaust passage 22 is determined, an ECU 100 defrosts the air pump 50. Concretely, the ECU 100 controls valves 71 and 73 to the open side, and controls a valve 72 to the close side. Accordingly, a part of exhaust is supplied to the air pump 50, and the air pump 50 can be defrosted by effectively using exhaust heat.
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Inventors:
YAMAGUCHI FUMITAKE
KONDO SHINYA
HONDA TOMOAKI
TAKADA NORIFUMI
KONDO SHINYA
HONDA TOMOAKI
TAKADA NORIFUMI
Application Number:
JP2007312529A
Publication Date:
June 25, 2009
Filing Date:
December 03, 2007
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
F01N3/22; B01D53/86; F01N3/18; F01N3/32; F01N5/02
Attorney, Agent or Firm:
Shuhei Katayama
Toshiyuki Hatta
High Yoshitaka Hayashi
Toshiyuki Hatta
High Yoshitaka Hayashi