Title:
CONTROL METHOD AND CONTROL DEVICE FOR VEHICULAR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2019/106740
Kind Code:
A1
Abstract:
In the present invention, an internal combustion engine (1) is provided with an electric supercharger (2) driven by an in-vehicle battery and can switch between a stoichiometric combustion mode, in which the vicinity of a theoretical air–fuel ratio is used as a target air–fuel ratio, and a lean combustion mode, in which a lean air–fuel ratio is used as the target air–fuel ratio. In a part (L2) of a lean combustion operation range (L) which is to be in the lean combustion mode, the electric supercharger (2) bears a part of the air intake volume. When operation is continuing in this second lean combustion operation range (L2) and the state of charge (SOC) is equal to or less than a lower-limit value (SOClim), the electric supercharger (2) is stopped and a forced switch is made to the stoichiometric combustion mode. Because of this, the air–fuel ratio changes in a stepwise manner, so worsening of NOx due to operation at an intermediate air–fuel ratio is avoided.
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Inventors:
ECHIGO RYO (JP)
Application Number:
PCT/JP2017/042751
Publication Date:
June 06, 2019
Filing Date:
November 29, 2017
Export Citation:
Assignee:
NISSAN MOTOR (JP)
International Classes:
F02D23/00; F02D41/04
Foreign References:
| JP2017057770A | 2017-03-23 | |||
| JP2001090543A | 2001-04-03 | |||
| JP2006348761A | 2006-12-28 | |||
| JP2007002780A | 2007-01-11 | |||
| JP2008008241A | 2008-01-17 | |||
| JP2009228586A | 2009-10-08 |
Other References:
See also references of EP 3719288A4
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
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