Design and Development of a Direct-acting Piezoelectric Fuel Injector

• Main Author: Nouraei, Hirmand
• Other Authors: Ben Mrad, Ridha
• Language: en_ca
• Published: 2012
• Subjects: Piezoelectric; Fuel injector; Diesel Engine; 0548
• Online Access: http://hdl.handle.net/1807/33480

Manufacturers face the challenge of enhancing fuel efficiency, engine performance, and reducing harmful emissions. Novel fuel injection technologies can assist in meeting such demands. This dissertation summarizes the stages in the design, prototyping and experimental analysis of a direct-acting piezoelectric fuel injector concept. In the proposed design, a piezoelectric stack actuator is used to directly control the injection of fuel in order to enhance the injection characteristics by utilizing the fast response time of the actuator. The direct-acting concept was implemented by developing a motion inverter in the form of a disc that reverses the direction of the input and allows the actuator to directly control injections. Tests with input signals similar to those used in diesel engines confirmed the theoretical calculations and verified the prototype’s performance. This design can control the quantity of injected fuel more precisely than currently available commercial injectors.