This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Novel Crank Mechanism Increasing Engine Efficiency and Reducing CO2 Emissions
Technical Paper
2015-01-1259
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
This study presents a novel crank mechanism which enables easy and fast compression ratio adjustment. The novel crank mechanism and piston travel are explained and highlighted. The basic idea is that eccentric gear is installed on a crankshaft web. Eccentric gear is fitted to the big end of the connection rod and eccentricity is controlled by rotating the control gear a discrete amount. Thus the position of eccentricity is varied and controls an effective stroke length. The compression ratio is adjusted to best fit current load demand, either optimizing fuel efficiency or engine power and torque. Adjustments are individual to each cylinder. The system is capable of adjusting from min to max within 10 milliseconds [ms]. Emphasis is on reduction of CO2 emissions and reducing fuel consumption, especially at part load condition.
The governing mechanical equations are presented. This novel crank mechanism has two new governing design parameters: Eccentricity and the angle of eccentricity when the cam angle is 0°. In our demonstration unit, the gear ratio between the eccentric gear and control gear is set to 1.5. This will make the induction-compression cycle different from the expansion-exhaust cycle. This gives a greater degree of freedom to design the engine performance.
The governing mechanical equations are presented. This novel crank mechanism has two new governing design parameters: Eccentricity and the angle of eccentricity when the cam angle is 0°. In our demonstration unit, the gear ratio between the eccentric gear and control gear is set to 1.5. This will make the induction-compression cycle different from the expansion-exhaust cycle. This gives a greater degree of freedom to design the engine performance.
The first full-scale engine demonstration test runs were made at Oulu University engine laboratory. The demonstration version was modified from an existing commercial (Honda R18A2) SI engine.
In addition to reduction of CO2 emissions, the engine is adjustable for different fuels, making the most out of fuel consumption.
Recommended Content
| Journal Article | Diesel Combustion Noise Reduction by Controlling Piston Vibration |
| Technical Paper | Evaluation of the Potential Benefits of an Automotive, Gasoline, 2-Stroke Engine |
Topic
Citation
Pohjalainen, T. and Larmi, M., "Novel Crank Mechanism Increasing Engine Efficiency and Reducing CO2 Emissions," SAE Technical Paper 2015-01-1259, 2015, https://doi.org/10.4271/2015-01-1259.Also In
References
- Duke E. A new and Useful Engine US. Patent 1,553,009 3 23 July 1925
- Pohjalainen A. Cylinder Pressure Adjuster of a Motor US Patent n:0 8,662,032 1 4 4 March 2014
- Rhabi V. , Beroff J. and Dionnet F. Study of a Gear-Based Variable Compression Ratio Engine Powertrain & Fluid Systems Conference & Exhibition Tampa, Florida USA 2004
- Hyvönen , J. , Haraldsson , G. , and Johansson , B. Balancing Cylinder-to-Cylinder Variations in a Multi-Cylinder VCR-HCCI Engine SAE Technical Paper 2004-01-1897 2004 10.4271/2004-01-1897
- Automotive Handbook 8th Plochingen Robert Bosch GmbH 2011
- Heywood J. B. Internal Cumbustion Engine Fundamentals International Singapore McGraw-Hill 1988
- Basshuysen R. v. , R. V. , and Schaefer , F. Internal Combustion Engine Handbook Society of Automotive Engineers, Inc. 2004 10.4271/R-345
- Gomecsys 01 03 2014 http://www.gomecsys.com/#home/product/demo-car||demo-car 12 08 2014
- Tomazic D. , Kleeberg H. , Bowyer S. , Dohmen J. , Wittek K. and Haake B. Two-Stage Variable Compression Ratio (VCR) System to Increase Efficiency in Gasoline Powertrains DEER Conference 2012 Dearborn 2012
- Malpress R. Spark Ignition Internal Combustion Engine Efficiency Improvment - a Variable Compression Ratio Option Toowomba, Australia University of Southern Queensland 2011
- Rychter T. J. and Teodorczyk A. VR/LE Engine with a Variable R/L during single Cycle SAE International Congress & Exposition Detroit, Michigan USA 1985
- Wardznski W. and Rychter T. Variable R/L Reaserch Engine - Design and Preliminary Investigations International Off-Highway & Powerplant Congress and Exposition Milwaukee, Wisconsin USA 1991
- Klein M. and Eriksson L. Utilizing Cylinder Pressure data for Compression Ratio Estimation IAFC Linköping, Sweden 2005
- http://ec.europa.eu/clima/policies/transport/vehicles/cars/index_en.htm
- Szybist , J. , Foster , M. , Moore , W. , Confer , K. et al. Investigation of Knock Limited Compression Ratio of Ethanol Gasoline Blends SAE Technical Paper 2010-01-0619 2010 10.4271/2010-01-0619
- Basshuysen R. v. Gasoline Engine with Direct Injection Wiesbaden Vieweg+Teubner 2009
- Tirkkonen E. New Arrangement of Compression Components in a Medium Speed Engine Vaasa Aalto University 2012