GPF14101
Group
Design and Development of EFI System for Fuel Efficient Car
1. Siddhardha Viswanadham
4. R. Nayanashree
2. Kalupukuri Harish Kumar
3. Shivalingaraju Sattigeri
Department(s)
Automotive and Aeronautical Engineering, Mechanical and Manufacturing Engineering
Mentor(s)
V. Hima Kiran Vithal, R. Raja, G. Ranjith Pawar, S. Anil Kumar
With increasing pollution around the world, there is an increasing demand for cleaner engines and higher fuel economy.
In SI engines, two types of fuel feeding systems are being used, namely carburettor and electronic fuel injection. Precise
control of air-fuel ratio of the mixture inside the engine cylinder is one of the major drawbacks of carburetors.
Microcontrollers are playing a major role in precisely controlling the amount of fuel that is sent into the engine, which is
crucial for reducing emissions and increasing performance. Hence, this project aims at retrofitting an electronic fuel
injection system onto a carburetted 150 cc single cylinder mo torcycle engine.
The fuel injection quantity is based on various parameters which are obtained from different sensors located on the
engine. The ECU, in which the engine maps are stored, is the brain of the EFI system. Engine maps have been
developed that operates with inputs from engine speed sensor and throttle position sensor. The sensors have been
calibrated and the input to the actuator has been modelled with different duty cycles of PWM, to operate the fuel
injector according to the lookup table using MATLAB-Simulink. A driver circuit, comparator circuit and a step down
transformer have been modelled using Multisim to operate the EFI system. A driveline has been designed for the vehicle
on which this engine will be mated to.
The modelled logics and circuits have been simulated and expected results have been obtained. The software and
hardware have been interfaced, sub systems have been integrated, tested at different levels and implemented on the
engine. Modifications have been made to the throttle body to fit the assembly on to the existing cylinder head. The
engine has been started successfully using the fuel injector.
EFI System development in Simulink and hardware implementation
Book of PG Group Projects Abstracts
1
February 2016