Browse Publications Technical Papers 2001-01-1840
2001-12-01

EXPERIMENTAL ANALYSIS OF A TWO-STROKE DIRECT INJECTION ENGINE PROTOTYPE 2001-01-1840

Several studies are currently dealing with the so-called ‘new generation two-stroke engines’. In nearly all these, charge control by means of fuel injection has been proposed to overcome the well-known problems of fuel and lube-oil consumption, and the probably unacceptable level of pollutant emissions. Direct injection, in particular, seems to guarantee the best results as it allows to avoid the short-circuiting of the fuel to the exhaust.
The direct-injection systems proposed in recent times do not seem to be widely applicable especially to small two-stroke engines as they introduce considerably complicated and consequently high-cost systems.
A new direct injection system, based on the hydraulic phenomenon commonly known as “water hammer”, has been proposed by the authors as a reliable means of achieving high injection pressures while maintaining the simple manufacturing and low-cost characteristics of two-stroke engines. Though ideal for small two-stroke engines this concept appears suitable also for every other kind of spark-ignited engine.
The system, equipped with a low-pressure fuel pump, provides high injection pressure values thanks to the conversion of the kinetic energy of the fluid into a local pressure rise which takes place when the fuel flow is suddenly halted by an automatic valve.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.
X