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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.

A novel gas fuel injector system based on the use of monostable fluidic devices is described in this paper. The proposed system consists of non-moving-part fluidic devices which are capable of operating in a Pulse Width Modulated (PWM) control mode and of handling a large amount of gas flow for engine operations. The system also includes an electro-fluidic interface for fluidic switching and air-gas mixing nozzles for better mixing quality. Two prototype fluidic injector units were produced and their steady-state and dynamic characteristics were evaluated on a laboratory test rig. The results were compared with those from several commercial gas injectors and it was found that the fluidic injector has a faster dynamic response and a smaller cycle-cycle variations.