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1. (WO2017038858) COMPRESSION RATIO ADJUSTMENT DEVICE FOR INTERNAL COMBUSTION ENGINE, AND METHOD OF CONTROLLING COMPRESSION RATIO ADJUSTMENT DEVICE FOR INTERNAL COMBUSTION ENGINE

Pub. No.:    WO/2017/038858    International Application No.:    PCT/JP2016/075438
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Sep 01 01:59:59 CEST 2016
IPC: F02D 15/02
F02B 75/04
F01L 1/356
Applicants: HITACHI AUTOMOTIVE SYSTEMS, LTD.
日立オートモティブシステムズ株式会社
Inventors: SHOJI, Masahiro
庄司 真敬
NAKAMURA, Makoto
中村 信
Title: COMPRESSION RATIO ADJUSTMENT DEVICE FOR INTERNAL COMBUSTION ENGINE, AND METHOD OF CONTROLLING COMPRESSION RATIO ADJUSTMENT DEVICE FOR INTERNAL COMBUSTION ENGINE
Abstract:
Provided is a novel compression ratio adjustment device for an internal combustion engine, with which knocking-resistant performance can be improved and increases in the temperature of exhaust gas can be minimized. This compression ratio adjustment device is configured to make the mechanical compression ratio relatively small and make the mechanical expansion ratio at the same time relatively large in regions of large load on the internal combustion engine. With this configuration, because control is performed to make the mechanical compression ratio smaller and the mechanical expansion ratio at the same time larger in regions of large load on the internal combustion engine, knocking-resistant performance can be improved, increases in the temperature of exhaust gas can be minimized, and heat damage to exhaust system components can be reduced.