1. Introduction

The revolutionary D.A.R.T. engine is both a unique and novel conception. This new design combines the economy and efficiency of a Diesel, with the simplicity and compactness of a rotary engine. It addresses all of the three main requirements, for any new power unit, being:

  • Increased efficiency
  • Less pollution
  • Economically viable

The thermodynamic efficiency is enhanced by having different volumes for the compression and expansion phases together with an asymmetric geometry. The fuel burns at a higher temperature and pressure for a given compression ratio but the exhaust gases exit the engine cooler. Thus more energy is extracted from the fuel. The engine uses compressed air scavenge for the exhaust phase. Exhaust gases are oxidised more completely thereby significantly reducing emissions. With one power phase per revolution, the engine produces over twice the power of a conventional engine for the same physical size. It is also expected that, being a rotary engine, the maximum rpm will be at least one and a half or twice that of a conventional engine. This increases the tractability of the engine (low rpm torque to high rpm power).

Note: For the same induction capacity, the D.A.R.T. engine would be only half the size/weight of a conventional engine, yet still produce 27% more power together with a 12% increase in efficiency. This is based upon a four cylinder conventional four stroke engine verses a two bank D.A.R.T. engine. Thus the number of power phases for both engines is equal at an equivalent rpm. See section 4. Concepts and Comparisons for details.The extra rpm range of the D.A.R.T. engine will also yield an extra pro rata increase in power.

In this appraisal we will discuss only the Diesel fuel application, although the engine presented here will perform equally well with other fuels. For an appraisal of the H.A.R.T. (Hyrogent fuelled) engine, please see section 7. Addendum H.A.R.T. for details. To enable the reader to compare the new and old technologies, a comparison is made between the D.A.R.T. engine and a four-stroke conventional piston engine design.

The design here presented did not derive from any existing designs (Wankel or vane type motors) it appears to be a totally new and unique concept. The D.A.R.T. engine is not constrained by the traditional Otto or Diesel cycles. The D.A.R.T. cycle has similarities to the Atkinson/Miller cycles, which are being developed by some of the major motor manufactures for high efficiency hybrid vehicles. The D.A.R.T. engine, however, comes closer to the true Atkinson cycle by having one power phase per revolution. The D.A.R.T. allows several phases of the cycle to occur in parallel, which results in an extremely efficient handling of the gases. All phases are completed within one revolution of the engine; a conventional four-stroke engine requires two revolutions to complete its cycle.

The team behind the D.A.R.T. engine, believe that with this technology new frontiers can be broken in the areas of pollution control, energy efficiency and compactness. As the challenges we face keep getting bigger, we need radical and fundamental solutions to breakthrough the technological frontiers. The D.A.R.T. engine is one of these.

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