Low cost electronic fuel injection for motorcycles and utility engines

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. Conclusions are drawn from the test results showing the clear benefits of PCI fuel injection for both emissions and fuel consumption reduction when compared to carburettor systems. The paper also demonstrates that PCI performance is comparable to state-of-the-art small engine EFI system but available at half the cost. © 2008 SAE International.