free piston engine linear generator

It is a free-piston engine coupled with a linear alternator.
It converts chemical energy from fuel into electric energy. Because of its versatility, low weight and good efficiency, it can be used in a wide range of applications, although it is of special interest to the mobility industry as range extenders for electric vehicles.

1. F ree Piston Engine linear Generator BY:- Ashwin M S Automobile 5 th SeM.

2. FIRST GENERATION The modern free-piston engine was proposed by  R.P.Pescara The original application was a single piston  Air compressor These first generation free-piston engines were without exception opposed piston engines in which the two pistons were mechanically linked to ensure symmetric motion . The free-piston engines provided some advantages over conventional technology, including compactness and a vibration-free design.

3. What is a free piston engine ?

4. Introduction Free Piston Linear Engine is nothing but an engine which works without crankshaft Instead of crankshaft , here an turbine and linear alternator is used to convert the rotary motion into reciprocating motion This crank less engine reduce the losses due the crank In free engine generator is used to re-generator electricity

5. Free Piston gas generator

6. Single Piston Free Single Piston linear Engine It consist of a combustion cylinder a load device and a rebound device Which accurately control the amount of energy put into the compression process and there by regulates the compression ratio and stroke length. A simple design with high controllability is the main strength of this design compared to others

7. In this design, the need for a rebound device is eliminated since the working Piston itself acts as rebound device. This allows a simple and compact device with higher power to weight ratio. The control of piston motion has proved difficult since small variations in the combustion in either of the two cylinders will have high influence on the next compression . Hydraulic dual piston free-piston engine Dual Piston

8. Opposed Piston This design consists of two single piston units with a common combustion chamber. Each piston requires a re-bound coupled to one or both of the pistons ensure symmetric piston motion. the main advantages are Free opposed piston hydraulic pump re-bound device, and a load device may be pistons Mechanical linkages connecting the two balanced and vibration-free design and reduced heat transfer losses due to the Elimination of the cylinder head. but, it is seen that the need for a piston Synchronization mechanism together with the dual set of the main components Makes the engine complicated and bulky .

9. These are free piston engines feeding hot gas to a power turbine The only load for the engine is that to supercharge the intake air The free piston gas generator has the advantage of high compression and pressure ratio in that arrangement the work needed to compress to compress the intake air is e

10. One (or more) combustion chamber with a single or two opposite pistons One (or more) linear electric generator, which is composed of a static part (the stator) and a moving part (the magnets) connected to the connection rod. One (or more) return unit to push the piston back due the lack of the crankshaft (typically a gas spring or an opposed combustion chamber) The free-piston engine linear generators can be divided in 3 subsystems:

11. Alternater

12. LIBERTINE LINEAR MACHINE It is made up of Coil Soft mechanical component & Magnet (build together in reaping unit) The end provide sensing and pairing up the connector

13. Translator With repeating units assemble on to a long shaft The electrical machine bore is the in then precision machined and coated so the Translator can pass through the machine The machine act an a part of a free piston expander device

14. Advantage of free piston linear generator More efficient Easy to manufacturing Compact Cheaper top manufacture

15. Efficiency of fplge In compare to a conventional reciprocating engine it gets 30 per more efficient

16. P-v diagram When shown in the pressure volume diagram this maximum the air enclosed air in compression to conventional reciprocating engine This means that more usefully energy is extracted improving efficiency and fuel economy

17. Advantages of free-piston engine : Mechanical simplicity Flexibility and reliability Power to weight ratio Multi fuel capability Low turbine operating temperature Less vibration and noise Less maintenance Easy to start piston Highly suitable for waste heat recovery Give high degree of maneuverability Less manufacturing cost Low NOx emissions It offers HCCI combustion process Internally balanced

18. Disadvantages of  free-piston engine  : Poor fuel economy Stability of fuel supply Poor part load efficiency High combustion rate Reduction gearing is require

19. Conclusion When we think of automotive technology of the future, we usually think of alternative fuels, whether its hydrogen or electric power from futuristic batteries. It turns out, the future might actually be a new form of internal combustion: the ‘free piston’ engine.