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Patent Searching and Data


Title:
CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2015/004734
Kind Code:
A1
Abstract:
In response to an increase in required torque to or beyond a reference value, the value of a virtual air-fuel ratio, which is used for calculating a target air-fuel ratio needed for achieving the required torque, is changed from a first air-fuel ratio to a second air-fuel ratio that is leaner than the first air-fuel ratio. The target air-fuel ratio is back calculated from the required torque using the virtual air-fuel ratio. Then, after the value of the virtual air-fuel ratio is changed from the first air-fuel ratio to the second air-fuel ratio, the target air-fuel ratio is switched from the first air-fuel ratio to the second air-fuel ratio. An operation amount of a fourth actuator is determined using a parameter corresponding to the ratio of fresh air in exhaust gas and the virtual air-fuel ratio. Preferably, a first base operation amount, which is used for achieving a target EGR rate during combustion at the virtual air-fuel ratio, and a first correction amount, which is used for changing the EGR rate to decrease with increase in the ratio of excessive fresh air, are calculated, and a value that reflects the first correction value on the first base operation amount is determined as the operation amount of the fourth actuator.

Inventors:
YOSHIZAKI, Satoshi (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
TANAKA, Satoru (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
Application Number:
JP2013/068765
Publication Date:
January 15, 2015
Filing Date:
July 09, 2013
Export Citation:
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Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA (1 Toyota-cho, Toyota-shi Aichi, 71, 〒4718571, JP)
YOSHIZAKI, Satoshi (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
TANAKA, Satoru (1 Toyota-cho, Toyota-sh, Aichi 71, 〒4718571, JP)
International Classes:
F02D21/08; F02D13/02; F02D43/00; F02D45/00; F02P5/15
Foreign References:
JP2002339778A2002-11-27
JP2000154747A2000-06-06
JP2008144689A2008-06-26
JP2002097976A2002-04-05
JPH062639A1994-01-11
Attorney, Agent or Firm:
TAKAHASHI, Hideki et al. (Takada, Takahashi & Partners 5th Floor, Intec 88 Bldg., 20, Araki-cho, Shinjuku-k, Tokyo 07, 〒1600007, JP)
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