Electro-fluidic Devices as Fuel Injectors for Spark-ignition Engine Fuel Injection Systems

A prototype fluidic fuel injection system for Spark-ignition(SI) engines has been established and tested. The fluidic injector unit combines a non-moving part wall reattachment type fluidic device powered by a solenoid pulser interface and an air-fuel mixing nozzle for good fuel atomization. It is demonstrated that the fluidic injector unit is capable of operating in a pulse modulated control mode and that the fluidic injector stage performs on-off switching in 1-1.5 msec.. The use of a fast response fluidic device coupled to a low power electric-fluidic interface potentially offers considerable cost and performance benefits for SI engine fuel injection systems.