UVU Computer Engineering Capstone Project

Development of an Electronic Fuel Injection System for Decreasing Greenhouse Gas Emissions (2019-2020)

Project Sponsor: Students
Team Members: Jason Sheetz and Chidi Okonkwo

Faulty Advisor: Dr. Afsaneh Minaie

  • Motorcycle Used
  • Carburetor
  • Fuel Injection
  • Throttle Bodies
  • Fuel System
  • Fuel Tank
  • Parked Motorcycle
  • Testing for spark plug driver circuit
  • Signal from the MAP sensor in red, the decrease in voltage is proportional to a decrease in pressure. The ‘intake on piston number 1’ signal from the Arduino is based on the reading from the MAP sensor and is shown in yellow.
  • The signal from the crankshaft in red, along with the TDC signal from the Arduino in yellow
  • System Level Design Schematic

The purpose of this project was to design an electronic fuel injection system utilizing an ARM Cortex M4 microcontroller that introduces fuel into the engine combustion chambers through a method of programmed pulses. The motivation for this project was to replace the inefficient and environmentally unfriendly factory-installed carburetor with an electronic fuel injection system. A carburetor is a device that uses mechanical input (throttle) to control the amount of fuel burned in a gasoline engine, there is no feedback loop to adjust the amount of fuel burned based on exhaust gas composition.

The addition of a microcontroller allowed for the adjustment of the amount of fuel burned based on a number of operating parameters and exhaust gas composition, this leaded to increased fuel efficiency and decreased greenhouse gas emission. The addition of an electronic fuel injection system necessitated developing a hardware design that was predominantly compatible with the motorcycle’s engine and existing fuel delivery system. Drawings and descriptions of these mechanical adjustments were also documented. A Texas Instruments TM4C129Exl development board was incorporated to determine the correct amount of fuel to burn based on atmospheric sensor input and exhaust gas composition as well as affect the correct timing scheme for fuel injector and spark plug control. 

Students' Presentation