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High Speed Fuel Injection System for 2-Stroke D.I. Gasoline Engine
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English
Abstract
Two-stroke gasoline engines are known to benefit from using in-cylinder fuel injection which improves their ability to meet the strict fuel economy and exhaust emissions requirements. A conventional method of in-cylinder fuel injection involves application of plunger-type positive displacement pumps. Two-stroke engines are usually smaller and lighter than their 4-stroke counterparts of equal power and need a pump that should also be small and light and, preferably, simple in construction. Because a 2-stroke engine fires every crankshaft revolution, its fuel injection pump must run at crankshaft speed (twice the speed of a 4-stroke engine pump).
An electronically controlled fuel injection system has been designed to satisfy the needs of a small automotive 2-stroke engine capable of running at speeds of up to 6000 rpm. The fuel flow to individual engine cylinders is controlled by solenoid valves capable of one cycle response and individual cylinder adjustment of injection quantity and timing. The design and operating principles of the pump and injectors are described, and the test results of cylinder-to-cylinder distribution, cycle-to-cycle variability and fuel atomization as well as testing methods are discussed.
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Citation
Schechter, M., Jary, E., and Levin, M., "High Speed Fuel Injection System for 2-Stroke D.I. Gasoline Engine," SAE Technical Paper 910666, 1991, https://doi.org/10.4271/910666.Also In
References
- Schechter M. M. “Fast Response Multipole Solenoids” SAE paper 820203
- Schechter M. M. Asik J. R. “Direct Fuel Injection with Electromagnetic Spill Control-Investigation with the EME-4 Pump” SAE paper 840308
- Schechter M. M. Simko A. O. “EMI-Series Electromagnetic Fuel Injection Pumps” SAE paper 880421
- Schechter M. M. Levin M. B. Dutcher, W. R. Jr. “Electromagnetically Controlled Distributor-Type Fuel Injection System” SAE paper 890477
- Jary E. H. “Needle Lift Stability Tests of the DFI 80° Spray Injectors” Inter Office Report Ford Engineering and Manufacturing Staff November 20 1987
- Laforgia D. Chehroudi B. Bracco F. V. “Structure of Sprays from Fuel Injectors - Part II, Ford DFI-3 Fuel Injector” SAE paper 890313
- Flaczynski L. F. “Particle Measurement System” Ford Fuel System Engineering Laboratory October 1986
- Adams J. W. Stein R. A. Leydorf, G. F. Jr. Schrader M. J. “Initial Evaluation of a Spill Valve Concept for Two-Stroke Cycle Engine Light Load Operation” SAE paper 901663
- Daisho Y. Saito T. Ishibe N. Tsukada M. Yukawa M. “Performance and Exhaust Emissions of a Two-Stroke Spark-Ignition Engine with a Direct-Injection System” JSAE Review 11 4 October 1990