ABNORMALITY DIAGNOSTIC DEVICE FOR VARIABLE COMPRESSION RATIO MECHANISM

Japanese Patent JP2018028311

A

PROBLEM TO BE SOLVED: To provide a technology capable of making an abnormality diagnosis of a variable compression ratio mechanism without adding a specific equipment configuration for estimating a compression ratio.SOLUTION: An abnormality diagnostic device for a variable compression ratio mechanism applied to an internal combustion engine includes: a speed difference calculation section for calculating a predetermined speed difference that is a speed difference between engine speed at a predetermined crank angle before a compression top dead center or after the compression top dead center and engine speed in the vicinity of the compression top dead center in a predetermined cylinder when fuel cut processing is being executed; a setting section for calculating a reference value of the predetermined speed difference on the basis of intake air amount of the internal combustion engine and a command signal supplied from a control section and setting a reference range of the predetermined speed difference by considering a predetermined variation of the reference value; and a diagnosis section for making a diagnosis to determine that an abnormality occurs in the variable compression ratio mechanism when the predetermined speed difference is outside the reference range.SELECTED DRAWING: Figure 9

ADACHI NORIYASU
WATANABE HIROSHI
OTA TOMOYA
YAMADA AYA
UENO YOSHIO
KAWAI KOKICHI

JP2017065533A

February 22, 2018

March 29, 2017

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TOYOTA MOTOR CORP

F02D45/00; F02D15/02; F02D17/00; F02D41/12; F02D41/32

JP2009293497A	2009-12-17
JP2005264853A	2005-09-29
JP2013245567A	2013-12-09
JP2000310146A	2000-11-07

US20120042854A1

2012-02-23

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

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