A Novel Low Cost High Frequency Fuel Injection System for Small Engines

Allen, Jeffrey; Ravenhill, Paul

doi:10.4271/2006-32-0107

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…Some data was published regarding the electrical and spray characteristics of the atomizer (Lehr and Hiller (1993)), however detailed studies investigating the e↵ect of di↵erent frequencies and internal geometry were not documented. A patent for a pulsed voltage pulsed flow electrostatic atomizer was brought forth by Allen and Ravenhill (2006), however data from a working prototype is not available.…”

Section: List Of Symbolsmentioning

confidence: 99%

Electrical and transient atomization characteristics of a pulsed charge injection atomizer using electrically insulating liquids

Kourmatzis

Shrimpton

2011

Journal of Electrostatics

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Charge injection atomizers are energy e cient devices that can be used in order to promote the atomization of dielectric liquids, and a potential application of such devices is fine spray delivery in small internal combustion engines. The operation of a pulsed charge injection atomization system operating at practical engine frequencies under a high voltage pulse train has not been well recorded in the literature. This initial investigation defines the electrical and transient global atomization performance of a charge injection atomizer operating under a steady flow regime, but with a typical high voltage pulse train. Results show that voltage-current characteristics follow similar trends to that of a steady flow, steady voltage system, and observation of the data also reveals that output current waveforms depend on the input pulse train frequency. No degradation in charging e ciency was observed at higher frequencies, which suggests that a charge injection atomizer can operate e ciently at practical engine speeds. Photographs also confirmed the high voltage pulse train injects charge that produces sections of primary atomization on the continuous liquid jet.

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Section: List Of Symbolsmentioning

confidence: 99%

Electrical and transient atomization characteristics of a pulsed charge injection atomizer using electrically insulating liquids

Kourmatzis

Shrimpton

2011

Journal of Electrostatics

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“…Pulse Count Injection (PCI) [1,2] is a new and novel low cost high frequency fuel injection system designed specifically for the small engine market (both 2 and 4 stroke engines). The PCI technology is based around an injector that operates as a positive displacement pump, shown in Figure 2.…”

Section: Low Cost Fuel Injection Systemmentioning

confidence: 99%

Fuel Injection for Low Emission 50cc 2-Stroke Scooter

Ravenhill

Allen

Smither

et al. 2010

SAE Technical Paper Series

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The ideal attributes of light weight, low cost and high power density have made the 2-stroke engine unrivalled in the scooter and moped market for many years. However, the challenges of meeting new emissions regulations, especially the latest Euro III emission test cycle have reduced the 2-stroke's dominance and it is now often considered to be too dirty and inefficient to have a future. As a result its product placement is on the decline. This paper introduces and discusses the latest application of a low-cost high-frequency injection system (Pulse Count Injection [1,2]) to both the fuel flow and lubrication oil flow of a 2-stroke scooter; allowing both fluids to be individually mapped and optimised for the complete engine operating range. This in turn enables the 2-stroke engine to pass the latest Euro III test whilst improving the fuel economy by a considerable margin, without changing the architecture of the engine. Examples of the latest developments of a highly integrated engine management system, including fuel and oil injector technology are shown. The paper draws conclusions from the test results showing the clear benefits of electronic fuel injection both for emissions and fuel consumption, and demonstrates that these benefits are achievable from a compact well integrated throttle body unit suitable for the small 2-stroke engine market.

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“…Pulse Count Injection (PCI) [ref 1,2,3] is a new and novel low cost high frequency fuel injection system designed specifically for the small engine market. This new approach results in a compact low cost integrated Engine Management system ideal for single or twin cylinder engines.…”

Section: Introductionmentioning

confidence: 99%