Title:
VARIABLE VALVE DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2010/055588
Kind Code:
A1
Abstract:
A variable valve device for an internal combustion engine capable of changing the operation state of a valve between a valve operating state and a valve stopped state enables reliable prevention of degradation of a catalyst when the internal combustion engine is started under the circumstance where the catalyst temperature is high. The variable valve device comprises a switching mechanism (64) for switching between attachment and detachment of rocker arms (72, 74) disposed between cams (54, 56) and a valve (28). The switching mechanism (64) includes an actuator (106) which is electrically driven and indirectly actuates a switching pin (88) or the like. If the temperature of a catalyst (36) is equal to or higher than a degradation possibility lower-limit temperature when an IG switch (50) of an internal combustion engine (10) is turned off, a stop operation is completed while an electric current is passed through the actuator (106), and after the completion of the stop operation, the passage of the electric current through the actuator (106) is continued until the temperature of the catalyst (36) reaches the degradation possibility lower-limit temperature.
Inventors:
KIDOOKA AKIO (JP)
Application Number:
PCT/JP2008/070873
Publication Date:
May 20, 2010
Filing Date:
November 17, 2008
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
KIDOOKA AKIO (JP)
KIDOOKA AKIO (JP)
International Classes:
F02D13/02; F01L13/00; F01N3/24
Domestic Patent References:
| WO2005059320A1 | 2005-06-30 |
Foreign References:
| JP2004169646A | 2004-06-17 | |||
| JP2008014191A | 2008-01-24 |
Attorney, Agent or Firm:
TAKAHASHI, Hideki et al. (JP)
Hideki Takahashi (JP)
Hideki Takahashi (JP)
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