CONTROL SYSTEM OF INTERNAL COMBUSTION ENGINE

Japanese Patent JP2018025187

A

PROBLEM TO BE SOLVED: To reduce noise which is generated when a mechanical compression ratio is set at a prescribed low compression ratio, in an internal combustion engine having a variable compression mechanism using a variable length connecting rod.SOLUTION: Since a hydraulic piston slides in a hydraulic cylinder arranged at a connecting rod main body, an effective length of a variable connecting rod becomes changeable. Then, when a mechanical compression ratio is set at a prescribed low compression ratio, a working fluid is discharged from the hydraulic cylinder, and the hydraulic piston is descended to a bottom face of the hydraulic cylinder in the hydraulic cylinder. At this time, in the case that the mechanical compression ratio is set at the prescribed low compression ratio, when an engine rotational speed is not lower than a prescribed rotational speed, ignition timing is retarded more than the case that the engine rotational speed is lower than the prescribed rotational speed so that the ignition timing is apart from MBT more than the case that the engine rotational speed is lower than the prescribed rotational speed.SELECTED DRAWING: Figure 7

SUGIHIRA SHIGEHIRO
KATO NAOTO
MORIGUCHI RYUTARO
SHIBAIKE YUSHI

JP2017121619A

February 15, 2018

June 21, 2017

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TOYOTA MOTOR CORP

F02D15/02; F02B75/04; F02D41/04; F02D43/00; F02D45/00; F02P5/15; F16C7/06

Yoshiyuki Kawaguchi
Kazunobu Sera
Akira Hirakawa
Takehiko Sekine
Katsuhiko Imahori
Fuminori Miyashita
Atsushi Kokubo

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