Development of Manifold Electronic Fuel Injector Tester for Liquid Fuels (Petrol)

Abstract

In the present Technology, all manufacturers of Automotive (Small to Light duties) and related machines are producing their products with Computer controlled Fuel Management system, for the simple reasons that as compared to the carburetor engine: better engine performance, best fuel economy, better cold starting, better drivability and above all the meeting of the emission standards are the features of this design. Computer controlled fuel system, popularly known as EFI uses a solenoid injector to inject the required amount of fuel as per the requirement of the engine as determined by the computer from the signals sent by various sensors from around the key operating variables of the engine. The computer controlling is as per the predetermined instruction stored in the ROM (read only memory) of the ECU (electronic control unit) for different operating conditions of the engines so it is generally perfect as long as the injectors are in good electrical and mechanical order. The objective of this project was to develop (fabricate) external device that tests the performance of all Electronic Fuel Injection injectors for Injection Volume, Injection Variation, Injection Pattern and no Injector Leakage tests for port injection and throttle body injection to determine whether it was as per the recommendation by manufacturers or not, as required after some kilometers/years’ service of the vehicle. The methodology for standardization was proved by making the design considerations for the components, lines pressure, and voltage across injectors, injection duration/ pulse time using timer and flasher, in general by maintaining the tester to have accuracy and reliability as expected. The methodology used to design the frame structure that was used to support and host the system components was using AUTO-CAD technique.