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As a result of environmental pressures and end-user demands several companies are working on low cost fuel injection systems specifically for small motorcycles and utility engines. A common approach to this application is to take an existing engine management system derived from automotive or high end motorcycle applications and to re-design it to reduce its complexity and cost for the small engine market. This paper introduces and discusses the latest development and application of a novel engine management system designed from the outset specifically for low cost small engines for motorcycles and utility applications (Pulse Count Injection, PCI [ref 2, 3]). The paper details comparisons of the performance of the PCI system compared to carburettor and conventional EFI systems. Detailed results are shown for; Fuel consumption comparison Engine out emission benefits Fuel flow comparison Cost reduction The paper demonstrates the latest state of development of the PCI system technology.

As a result of environmental pressures and end-user demands many manufacturers are working on fuel injection systems for the small engines market [reference 1, 2, 3, 4, 5]. A common approach is to take an automotive or motorcycle system and work to reduce its cost and complexity. This paper will present an engine management system designed from the outset specifically for low cost small engines. The key topics covered in this paper are sensor selection & minimisation, practical application of electronic throttle & ignition, power consumption minimisation and discussion of the software control strategy. In conclusion, this paper shows that most components required for a small engine management system can be integrated into a throttle body requiring only 3 external components. It is also possible, with the addition of electronic throttle and ignition, to deliver significant user enhancements.