Variable compression ratio (VCR) for POGDC engines

Motors

& Pumps

Concept MPRBC

Concept POGDC

Special
STIRLING's engines

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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 ratio

Performances

& Applications

SYCOMOREEN has designed for its non rotary POGDC engines an efficient and simple system to vary continuously the compression ratio with values from 5 to 25 : it allows to better master the combustion, the overfeeding, encouraging the cleaning of the burnt gases and the downsizing.

non rotay POGDC engine, with its pistons (VAR) to regulate the compression ratio

non rotay POGDC engine, with its pistons (VARD) to regulate the compression ratio, and carrying its the injector (INJD)

non rotray POGDC , with its pistons (VARA,VARB,VARE) to regulate the compression ratio, carrying their injector (INJA,INB,INJE)

rotary POGDC , with its pistons (VARA,VARB,VARC,VARD,VARE) to regulate the compression ratio ; VARE is carrying its injector (INJE)

The POGDC engines have for every room (CA, CB, CC, CD, CE) an organ to modify the volume (VARA, VARB, VARC, VARD, VARE) which communicates with the room of combustion and is mobile between an advanced position and a remote position

Thus, the rate of compression can be adapted to approach of the optimal conditions of working :
- high if the organ (VAR) is in advanced position

- low if the organ (VAR) is in remote position

Acoording to the required combustion (essence ou Diesel), of preference the organ (VAR) to vary the compression ratio can carry an injector and/or a spark plug (INJ).

In any case, the organ of volume (VARA, VARB, VARC, VARD, VARE) to vary the volume is a piston and permits a fast modification of the volume of compression and/or the volume of aspiration for the rooms of combustion while penetrating more or less into them. This piloting can make itself notably by injection of an incompressible fluid under pressure in the body hollow ALE, or between VAR and the cover(CPG), or between (VAR) and the heads of pistons (TPA, TPB, TPC, TPD), or by an electric motor equipped with a reducer to screw without end pushing or withdrawing the piston made by the organ (VAR) which regulates the compression rate. This piloting can make itself independently for one or the other of the combustion rooms.

The amplitude of this regulating depends on the measurements of the parts of the motor. Other ways are foreseeable to optimize the combustion, notably by the overfeeding and/or the recycling of the burnt gases (EGR : exhaust gaz recirculation).

Side of an assemply 1 POGDC 4 MPRBC : all the rooms are managed with variable compression ratio and wedging of the valves

Side of an assemply 1 POGDC 4 MPRBC : all the rooms are managed with variable compression ratio and wedging of the valves

assembly 1POGDC + 4 MPRBC MPRBC : all the rooms are managed with variable compression ratio devices

3/4 back view of an assembly 1 POGDC 4 MPRBC : all the rooms are managed with variable compression ratio and wedging of the valves