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Diesel VCR (Variable Compression Ratio) Engine Development Using Multi-Link Mechanism
Technical Paper
2006-05-0333
Sector:
Language:
English
Abstract
A variable compression ratio (VCR) technology, that has a new
piston crankshaft mechanism with multi links, has been patented by
Nissan. This technology has been developed inside Nissan for some
years and has been shown in previous papers.
This proposed paper will present the use of the VCR technology
for diesel engine. The objectives set with the use of VCR for
diesel engine are both: 1) To reduce as much as possible engine-out
emission to prepare long-term more severe emission standard. 2) To
reach increased specific power output while limiting maximal
cylinder pressure.
This paper will explain how a variable compression ratio
technology could contribute to such objectives.
This study was conducted as an Alliance research activity
between Renault and Nissan based on the VCR mechanism originally
developed by Nissan (SAE Paper 2003-01-0921, 2005-01-1134) and
based on Renault expertise on diesel engines.
The VCR engine is based on Renault M9R 2.0-liter diesel engine.
With 130 kW et 360 N.m, the M9R 2.0-liter diesel engine is
today's best-in-class regarding specific output values.
Activities will be detailed in this paper including the design
of VCR mechanism adapted to diesel constraints (e.g., high cylinder
combustion pressure) and EHL studies realized to verify the good
behavior of the bearings of the mechanism under high loads. A
completely new diesel engine adapted to VCR mechanism has been
drawn. Lower engine parts include the integration of VCR
actuator.