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Concept POGDC

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OCTOGONAL PISTON WITH DEFORMABLE CONTROLLED GEOMETRY  (POGDC)

Principles Four times cycle Conversion of the motion System for variable valves' timing (VVT) System to regulate
the compression rate


The POGDC engine has a various number of rooms with alternated motions allowing the intake, the compression, the explosion/relaxation and the exhaust for all the rooms, which are delimited by the octogonal piston with deformable controlled geometry and the cover (the carter)..

4 times cycle for not rotary POGDC engine

The animation below shows the sequence of the different times  for a not rotary POGDC engine
admission = intake,        compression            explosion/détente=explosion/relaxation        échappement=exhaust

sequence of the 4 times cycle for a not rotary POGDC engine
sequence of the 4 times cycle  for a not rotary POGDC engine

In a general way, in the setting of a 4 times cycle :
- one has 4 peripheral rooms with variable volume
- and a central room
- every time a head of piston comes closer of the cover, one will have either a compression, either an exhaust on the peripheral rooms
- every time a head of piston moves away of the cover, one will have either an explosion / relaxation, either an intake on the peripheral rooms
- in the same time, the central room knows a cycle two times shorter than the one of peripheral rooms : it inhales 2 times  more often the cool air.


With the respect of the chronology for each room :

1.  Intake         2. Compression        3. explosion/relaxation         4. Exhaust


The non rotary POGDC engine can also be exploited with 2 times cycles of type (admission / exhaust) and (compression / relaxation) by a vigorous sweep of burnt gases by the cool air at to every end of relaxation.



4 times cycle for rotary POGDC engine

4 times cycle for rotary POGDC with fixed cover
Above, one makes the octogonal piston rotate inside the fixe cover

admission = intake,        compression            explosion/détente=explosion/relaxation        échappement=exhaust

in an opposite way, below, the cover moves around the octogonal piston of which the horizontal and vertical medians are fix :
4 times cycle for POGDC with rotary cover

In the both cases, admission and exhaust are permanent and valveless ,
but the explosion in the peripheral rooms takes place on only one sid..

Improvement of rotary POGDC with fixed cover

The optimized rotary POGDC engine is the first motor in the world to grant 4 times cyles :
- while having the advantages of the two times cycles
- without valves, but only a 
permanently blowing turbine of the fresh air.
- with
very simple overfeeding and/or retraining of the burnt gases (to see the patent (French) for the details)
- 10 explosions on only one round of the medians of the rotary octagonal piston (equivalent to a 20 cylinders powered by
4 times cycle  and rod / crankshaft kinematics)
 - perfectly balanced


optimized rotary POGDC
One joins blowing and sucking devices, respectively of the fresh air and the burnt gases. All 1/4 of round, 2 simultaneous explosions take place in the peripheral rooms, in addition to those of the central room that take place all 1/2 round.

(nevertheless, the central room can of preference to be used for the air storage)


In any case POGDC engines can be used in air / hydraulic motor, with the following features :
- one has rooms with variable volume
- every time the volume of a room increases, one will have the injection of the fluid under pressure
- every time the volume of a room decreases, one will have the exhaust of the fluid

With the respect of the chronology for each rooms:

1.  injection of pressurized fluid into the engine         2. Exhaust of the fluid

The POGDC engines can become the air / hydraulic pumps, with the following features :
- one has rooms with variable volume
- every time the volume of a room increases, one will have the admission of the fluid under weak pressure
- every time the volume of a room decreases, one will have the repression of fluid under pressure

With the respect of the chronology for each rooms:

1.  admission de fluide under weak pressure         2. repression of fluid under pression

In any case, the conversion of the motion into rotary continuous movement is necessary and maybe very finely controlled.


Principles Four times cycle Conversion of the motion System for variable valves' timing (VVT) System to regulate
the compression rate
Performances
& Applications
systèmes pour la conversion de mouvements et d'énergies renouvelables
Motors
& Pumps
Concept MPRBC
Concept POGDC

Special
STIRLING's engines

Back to the main menu