2. General Description

The engine consists of two interlaced circular chambers of slightly different diameters. Inside these chambers revolve two rotors about separate centres. Each rotor is located by its own bearings. The rotors do not rely on casing contact for their location as in a Wankel engine. Sealing of the rotors against the chamber walls is excellent because of their circular orbits and large sealing surfaces. The expansion of the engine is uniform. It does not have a hot and a cold side like the Wankel. Thus the engine does not require high tolerance manufacturing and wear of the rotors is not a factor. Induction air enters at the centre of the engine and compression/expansion occurs at the periphery producing uniform heat flow characteristics. The rotors are connected together by another component that has a quasi-circular orbit. These three components form the total internal mechanism of the engine. Each chamber within the engine is entirely separated from the others. This allows for the future development of alternative fuels like hydrogen to be used without the valve overlap and sealing problems associated with piston engines.

Diagram 1: Layout of engine

The engine does not have a traditional Otto or Diesel cycle. There are two compression phases. The first compression phase, which has a low compression ratio, controls the later scavenge of the exhaust gases. After the scavenge of the exhaust gases, the air is then partially re-circulated to act again in the next scavenge phase, the remainder of the air goes on to be compressed again in the second compression phase. In this second compression phase, the air is compressed at a higher compression ratio where the fuel is added. It is this fuel/air mixture that ignites to form the expansion phase. The inlet phase is in part contributed to by the scavenge gases. This all provides for an extremely efficient handling of the gases, with a significant reduction of exhaust emissions and excellent fuel economy. The expansion volume is larger than the second compression volume and this therefore increases the thermodynamic efficiency.

Diagram 2: Phases of engine


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