CONTROL DEVICE FOR COMPRESSION RATIO VARIABLE INTERNAL COMBUSTION ENGINE

Title:

CONTROL DEVICE FOR COMPRESSION RATIO VARIABLE INTERNAL COMBUSTION ENGINE

Document Type and Number:

WIPO Patent Application WO/2015/198462

Kind Code:

A1

Abstract:

A control device for a compression ratio variable internal combustion engine is provided with a compression ratio variable mechanism capable of changing an engine compression ratio in accordance with a rotation position of a control shaft and a compression ratio detection unit that detects an actual compression ratio. In a predetermined engine operation state (S11), for example, immediately after an engine start, a reference position learning operation for the compression ratio detection unit is carried out with the control shaft mechanically locked on a predetermined reference position (S12). During an engine operation, if the actual compression ratio is lost due to a communication error or the like (S13), or if a difference between the actual compression ratio and a target compression ratio is larger than expected due to some abnormalities (S14), the reference position learning operation is immediately carried out (S15), thereby causing a quick return to the state in which normal compression ratio control can be performed.

Inventors:

HIYOSHI RYOSUKE (JP)
OHTSU SHO (JP)

Application Number:

PCT/JP2014/067110

Publication Date:

December 30, 2015

Filing Date:

June 27, 2014

Export Citation:

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Assignee:

NISSAN MOTOR (JP)

International Classes:

F02D15/02; F02B75/32; F02D13/02; F02D41/04; F02D43/00; F02P5/15

Foreign References:

JP2006226133A	2006-08-31
JPH0772515B2	1995-08-02
JP2012225331A	2012-11-15

Other References: