High Efficient 125- 250 cm
LPDI Two-Stroke Engines, a Cheap and Robust Alternative to Four-Stroke Solutions?
The Institute of Internal Combustion Engines and Thermodynamics
at Graz University of Technology has developed a low-pressure (5
bar) direct injection (LPDI) combustion system for 50 cm₃
two-stroke engines during the last years. The 50 cm₃ two-stroke
engine is a specific European engine class. Worldwide the 125 cm₃
class is more important. In order to investigate the potential of
higher displacement engines equipped with the LPDI combustion
process, a demonstrator engine with 250 cm₃ has been developed. The
results of this demonstrator from the engine test bench and from
the chassis dynamometer are discussed to show the potential of this
two-stroke technology. In order to ease the interpretation, the
results of a homogenously scavenged two-stroke engine and of a
naturally aspirated four-stroke engine serve as reference.
The results show that the LPDI technology is a real alternative
to expensive four-stroke engines. The high efficiency and the very
low emissions are of special interest for the consumption-sensitive
Indian market, especially in high population urban areas with big
problems due to high air pollution.