Application of a New-Concept Gasoline Pump Injector (GPI) on a Motorcycle Engine

This paper presents the results of tests using a prototype pump-integrated port fuel injector that is designed for small gasoline engines. The unique construction of the injector eliminates the need for a separate feed pump. The device is intended as a solution to meet the upcoming emission norms similar to Euro 6 standards, to be implemented in Asian countries. In particular, the Indian two-wheeler market which produces around 20 million vehicles annually [1], migrates to Bharat Stage VI (BS VI) emission standards in the year 2020. This market is largely cost-driven and currently most of the motorcycles use carburettors as fuelling systems. It is expected that the adoption of port fuel injection would be inevitable to meet the BS VI emission norms. To minimize the increase in cost due to such a change, a new injector is developed, which integrates the fuel pump within the injector, making the system simple and compact, while calling for no change in the fuel tank. Usage of a solenoid actuator in the injector design, enables closed-loop fuel quantity control. In the injector, fuel is pressurized in a pumping chamber, and the pressurized fuel is then injected through orifices to produce a spray in the intake port of the engine. This injector was tested on a 200 cc motorcycle engine, using a steady state dynamometer. The performance and emission results were encouraging and the same are reported in this paper.