The variable compression engine implies that the compression ratio of the engine is controlled at every engine operation condition.
- During high load, a lot of power of the engine required and compression ratio is decreased and if the higher efficiency is needed during low load, the compression ratio is increased.
- The performance and efficiency of an engine vary with load demand and compression adapted to.
- In addition, the risk of pre-ignition, mega-knock on effects and engine jerking, as the result of retarded combustion phases, can be reduced.
Variable Compression Ratio (VCR) Design Methodology
- Moving the Cylinder Head
- Variation in Geometry of Connecting Rod
- Moving the Crankshaft axis
- Changing Piston Deck Height
- Dual Piston Mechanism
- Gear Based Mechanism
Table 1. Summary of Recent Advancement Designs by Manufacturers
| S.No | Automotive Company | Design Used |
| 1. | Mercedes Benz | 2013- Eccentric connected to Journal causing relative motion between crankshaft an cylinder head. |
| 2. | Ford | 2003- Dual-piston method in between which an Elastomeric mass is present |
| 3. | Nissan | 2014- Two control shaft together to vary the position of control, upper and lower links. |
| 4. | Gomecsys | 2013- Auxiliary gear method used to change the position of the eccentric at the big end of the connecting rod. |
| 5. | MCE-5 | MCE-5 VCRi- Used a control jack to change the position of TDS of the main piston. The control jack is moved by inertia and gas force. |
The VCR technology could provide the key to enable exceptional efficiency at light loads without loss of full-load performance.
Sagar Institute of Science & Technology is working beyond the syllabus. We are preparing students to work on R&D and established an IC engine 2-Stroke and 4-Stroke (Petrol and Diesel Engine) test rig. SISTec organizes module-based training to train students on current industry trends and content beyond the syllabus.
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