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A low cost multipoint fuel injection system which utilises no-moving-part fluidic devices as fuel injectors for gasoline engines is presented in this paper. This unique fluidic injector unit consists of four monostable fluidic devices, four air-fuel mixing nozzles and a prototype solenoid pulser interface for switching the fluidic stages. The current Electronic Fuel Injection (EFI) systems are reviewed and features of the fluidic injection system are illustrated in this paper. Preliminary investigation on the operating characteristics of the prototype unit was carried out both on a laboratory rig and on an engine test bench. The improvement in air/fuel mixture preparation by the fluidic fuel injection system compared with a baseline carburettor has been demonstrated.

This paper describes a gasoline injection system based on air-assisted fluidic injectors. This injection system was implemented on a research engine and the results of air to fuel ratio (AFR) variations, engine combustion characteristics and exhaust emissions from the fluidic injector unit were compared with those from the baseline solenoid type injector. It was demonstrated that the fluidic system produces 9% to 20% lower HC emissions and 5% to 8% higher IMEP than the baseline injection system. This has confirmed the effectiveness of the use of the air-assisted fluidic injector stages and that the improved mixture preparation fuel presentation are obtained by the fluidic system. However, the cyclic flow stability of the fluidic device needs improvement.