Title:
VARIABLE COMPRESSION RATIO SYSTEM FOR INTERNAL COMBUSTION ENGINE, AND CONTROL DEVICE FOR SAME
Document Type and Number:
WIPO Patent Application WO/2020/044768
Kind Code:
A1
Abstract:
When an internal combustion engine is stopped, or during startup thereof, a compression pressure is adjusted by means of a variable compression ratio mechanism (VCR), on the basis of a cylinder in a compression stroke. If the position of the piston in the cylinder in the compression stroke is on the compression top dead center side, a mechanical compression ratio is increased by the variable compression ratio mechanism (VCR), and if the position of the piston (01) in the cylinder in the compression stroke is on the intake bottom dead center side, the mechanical compression ratio is reduced by the variable compression ratio mechanism (VCR). By controlling the mechanical compression ratio by means of the variable compression ratio mechanism (VCR) on the basis of the crank angle of the cylinder in the compression stroke, the compression pressure of the cylinder in the compression stroke can be adjusted appropriately to stabilize the startup of the internal combustion engine, as a result making it possible to improve the startup performance of the internal combustion engine.
Inventors:
NAKAMURA MAKOTO (JP)
Application Number:
PCT/JP2019/025726
Publication Date:
March 05, 2020
Filing Date:
June 27, 2019
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
F02D15/02; F02B75/04; F02D13/02; F02D45/00
Foreign References:
| JP2006300033A | 2006-11-02 | |||
| JP2006144792A | 2006-06-08 | |||
| JP2007239490A | 2007-09-20 |
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
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