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Fuel Injection Team

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					Super-Mileage Fuel
 Injection Team -
Preliminary Design
Review - SDP 2005
Jordan Crafts, Mike Flanagan,
Dorinda Garcia, Jim Macdonald
      October 28th 2004

             SMV-FIT            1
                  Background
 Super-Mileage Vehicle
  Competition
 Why Electronic Fuel
  Injection?
    – Better Fuel Economy
    – Consistent Engine
      Performance
    – Improved Fuel
      Delivery Control
    – Adjustability
    – Data Acquisition

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         Today’s Presentation
 Background
 Deliverables
 Principles of
  Operation
 System Block
  Diagram
 Synopsis
 MDR Specification

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             Deliverables
 Working prototype
 A method to tune the prototype
 Software to view data
 Instruction manual




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Principles of Operation

                     Atomized
                      Fuel/Air Mixture
                     How do we
                      dispense fuel?
                     Carburetor -
                      Mechanical
                     Injector -
                      Electrical

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     Fuel Atomization via Injector




   A fuel injector is an electronically controlled needle valve
    which opens a pressurized fuel line – The Windex Bottle
    Effect
   Injector Pulse Width is what we want to control
   Injected Fuel Volume is proportional to the injector pulse
    width with the flow rate as a constant
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System Block Diagram




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System Block Diagram




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                   Motor




 The “Plant” we are trying to control
 Fuel Injector – Primary Actuator of the System
 Sensors
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System Block Diagram




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Driver Interface and Controller




 Driver specified Reference Air/Fuel Ratio
 Feed-forward Mass-Air Flow Control
 Feed-back Oxygen Sensor Control
 Output of Controller is Injector Pulse Width
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System Block Diagram




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                Recorder




 Records Data from Sensor Bus
 User can select data sources
 Downloaded serially to PC for display



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System Block Diagram




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            Power Electronics




 Alternator uses mechanical energy to keep battery
  charged
 Battery supplies 12V to vehicle ignition and other
  devices
 We will need 5V power supply for digital components
 May also require special electronics for other devices;
  i.e. injector or sensors
                          SMV-FIT                           15
                   Synopsis
 Electronic Fuel Injection
  -Potential Improvement
  over Carburetion
 Design Tasks
  -Feed-forward and
  Feedback control
  -Power Electronics
  -Computer Architecture
  -Programming


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     Proposed MDR Specification
   Injector Power
    Electronics
   Mounting of Sensors
   Functional Sensor
    Output
   Working Injector Test
    Program
   Controlled Injection
    and Ignition
   Plant Characterization

                         SMV-FIT   17
Thank you for coming.
      Any Questions?




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