Small Gasoline Direct Fuel Injection Two-Stroke Engines for Range Extender Applications English

  • Category Technical paper
  • Edition SIA
  • Date 05/27/2015
  • Author P. Duret, P. Dewangan - IFP School | S. Venturi - IFP Energies Nouvelles
  • Language English
  • Type PDF file (3.4 Mo)
    (Downloadable immediately on receipt of online payment)
  • Number of pages 9
  • Code R-2015-04-06
  • Fee from 8.00 € to 10.00 €

The main purpose of this paper will be to discuss various possibilities of using a small gasoline direct injected two-stroke engine as a range extender (REX) for electric vehicles (EV).
For such REX applications, the main requested specifications are: low noise and vibrations (NVH), compactness, lightweight, minimum production cost and efficiency. It is considered that meeting the emissions standards will be in any case compulsory.
Considering these specifications, this paper explores how the gasoline DI 2-stroke engine, thanks to its advantages resulting from its double combustion cycle frequency, can be a good candidate compared to other possible engine technologies. We will illustrate that through three examples of range extender applications based on DI 2-stroke engines:

  • a small displacement 2-cylinder scooter based engine as a safety device for an EV city car.
  • a modified 2-cylinder snowmobile engine as a REX (series hybrid) for a small multi-usage lightweight electric car,
  • a 3-cylinder marine outboard engine as REX for a multi-usage high performance EV sport car, Various design and simulation studies have been performed with these three configurations and will be presente

The results will show that emissions standards can be met when gasoline direct injection and ultra-low NOx Controlled Auto-Ignition (CAI) are combined together with an oxidation catalyst for aftertreatment. Beside the achievement of the Euro 6 NOx target, remarkably low level of average CO2 emissions can be achieved with impressively increased vehicle range (compared to the pure EV range) with only a few litres of gasoline.


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