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Variable Compression Ratio engine
- 1. Gandhinagar Institute ofTechnology Active Learning Assignment Subject : I.C.E Topic : Variable Compression Ratio Engine Guided By : Prof. Maulik Sukhadia Internal Combustion Engine 1
- 2. Contents • Introduction • History •Variable compression ratio • Various Parts • Efficiency of Engine Internal Combustion Engine 2
- 3. What is Variablecompression Ratio ? • Variable compression ratio is a technology to adjust the compression ratio of an I.C Engine while the engine is in operation. • CR in SI Engine : 8 • CR in CI Engine : 14 Internal Combustion Engine 3
- 4. Advantages of VCREngine • an increase in fuel economy • limits to car emissions, especially CO2 • allows free use of different fuels • No need of turbocharger and Supercharger • achieve higher power outputs • High compression ratio is used for good stability and low load operation. Internal Combustion Engine 4
- 5. History of VCREngine • The first VCR engine built and tested was by Harry Ricardo in the 1920s. This work led to him devising the octane rating system that is still in use today. • Waulis Motors Ltd was founded in 2011 by experienced engine technology • The Peugeot design works by varying the effective length of the con-rods connecting the piston to the crank. • SAAB Automobile rekindled interest in variable compression when they introduced their SVC engine to the world at the Geneva motor show in 2000. Internal Combustion Engine 5
- 6. How to changeCR ? • Slidable piston head and cylinder (SVC) • Variation of combustion chamber and volume • Variation of piston deck height • Modification of connecting rod geometry • Moving the crankpin within the crankshaft • Moving the crankshaft axis • Traverse type Internal Combustion Engine 6
- 7. Moving Head (SVC) InternalCombustion Engine 7
- 8. Variation of pistondeck height Internal Combustion Engine 8
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- 10. Alvar / volvoEngine • Alvar engine concept in which each secondary piston moves continuously at half crankshaft speed and could potentially share drive the cam shaft • Phase change between the secondary pistons and the crankshaft assembly enables the required variation in CR . Internal Combustion Engine 10
- 11. Envera Engine Internal CombustionEngine 11 • The crankshaft is mounted in a “crankshaft cradle”with the crankshaft axis and cradle axis offset by 13.5 mm. • Pivoting the cradle 32 degrees adjusts CR from 8.5:1 to 18.6:1.
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- 13. Infiniti (Nissan) VCTurbocharged • INFINITI’s VC-Turbo technology uses an advanced multi-link system to seamlessly raise or lower the reach of the pistons, detecting the car’s driving condition and driver inputs, and instantly selecting the most suitable compression ratio. • The engine is able to offer any compression ratio between 8:1 (for high performance) and 14:1 (for high efficiency). Internal Combustion Engine 13
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- 17. High compression isalso more efficient, so ask why not just make engines that are constantly at high Compression ? Internal Combustion Engine 17
- 18. • It causesknock, or unwanted pre-detonation of fuel. • causing detonation at the wrong times. Internal Combustion Engine 18 Ans…………..
- 19. Patent References • Companiessighting Envera / Mendler patents – Partial listing: BorgWarner Caterpillar Hitachi Cummins Honda Daimler INA Chrysler MTU DENSO Nissan FEV Pinnacle / Cleeves Ford Suzuki GE Toyota GM VW Izuzu Polaris Visteon Yamaha Internal Combustion Engine 19
- 20. References • https://www.infinitiusa.com/now/technology/vc-turbo- engine • https://jalopnik.com/worlds-first-variable-compression-ratio- engine-could-ki-1785295848 •https://energy.gov/sites/prod/files/2015/06/f23/ace092_men dler_2015.pdf • http://www.iitg.ernet.in/scifac/qip/public_html/cd_cell/chapt ers/uk_saha_internal_combustion_engine/qip-ice-32- variable%20compression%20ratio%20engines.pdf Internal Combustion Engine 20
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