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Super-Mileage Fuel Super-Mileage Fuel Injection Team - Injection Team -

Preliminary Design Preliminary Design Review - SDP 2005Review - SDP 2005Jordan Crafts, Mike Flanagan, Jordan Crafts, Mike Flanagan,

Dorinda Garcia, Jim Dorinda Garcia, Jim MacdonaldMacdonald

October 28October 28thth 2004 2004

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BackgroundBackground Super-Mileage Super-Mileage

Vehicle CompetitionVehicle Competition Why Electronic Fuel Why Electronic Fuel

Injection?Injection?– Better Fuel EconomyBetter Fuel Economy– Consistent Engine Consistent Engine

PerformancePerformance– Improved Fuel Improved Fuel

Delivery ControlDelivery Control– AdjustabilityAdjustability– Data AcquisitionData Acquisition

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Today’s PresentationToday’s Presentation

BackgroundBackground DeliverablesDeliverables Principles of Principles of

OperationOperation System Block System Block

DiagramDiagram SynopsisSynopsis MDR SpecificationMDR Specification

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DeliverablesDeliverables

Working prototypeWorking prototype A method to tune the prototype A method to tune the prototype Software to view dataSoftware to view data Instruction manualInstruction manual

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Principles of OperationPrinciples of Operation

Atomized Atomized Fuel/Air Fuel/Air MixtureMixture

How do we How do we dispense fuel?dispense fuel?

Carburetor - Carburetor - MechanicalMechanical

Injector - Injector - ElectricalElectrical

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Fuel Atomization via InjectorFuel Atomization via Injector

A fuel injector is an electronically controlled needle valve A fuel injector is an electronically controlled needle valve which opens a pressurized fuel line – The Windex Bottle Effectwhich opens a pressurized fuel line – The Windex Bottle Effect

Injector Pulse Width is what we want to controlInjector Pulse Width is what we want to control Injected Fuel Volume is proportional to the injector pulse Injected Fuel Volume is proportional to the injector pulse

width with the flow rate as a constantwidth with the flow rate as a constant

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System Block DiagramSystem Block Diagram

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System Block DiagramSystem Block Diagram

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MotorMotor

The “Plant” we are trying to controlThe “Plant” we are trying to control Fuel Injector – Primary Actuator of the SystemFuel Injector – Primary Actuator of the System SensorsSensors

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System Block DiagramSystem Block Diagram

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Driver Interface and Driver Interface and ControllerController

Driver specified Reference Air/Fuel RatioDriver specified Reference Air/Fuel Ratio Feed-forward Mass-Air Flow ControlFeed-forward Mass-Air Flow Control Feed-back Oxygen Sensor ControlFeed-back Oxygen Sensor Control Output of Controller is Injector Pulse WidthOutput of Controller is Injector Pulse Width

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System Block DiagramSystem Block Diagram

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RecorderRecorder

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

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System Block DiagramSystem Block Diagram

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Power ElectronicsPower Electronics

Alternator uses mechanical energy to keep battery chargedAlternator uses mechanical energy to keep battery charged Battery supplies 12V to vehicle ignition and other devicesBattery supplies 12V to vehicle ignition and other devices We will need 5V power supply for digital componentsWe will need 5V power supply for digital components May also require special electronics for other devices; i.e. May also require special electronics for other devices; i.e.

injector or sensorsinjector or sensors

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SynopsisSynopsis Electronic Fuel InjectionElectronic Fuel Injection

-Potential Improvement -Potential Improvement over Carburetionover Carburetion

Design TasksDesign Tasks-Feed-forward and -Feed-forward and Feedback controlFeedback control-Power Electronics-Power Electronics-Computer Architecture-Computer Architecture-Programming-Programming

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Proposed MDR SpecificationProposed MDR Specification Injector Power Injector Power

ElectronicsElectronics Mounting of SensorsMounting of Sensors Functional Sensor Functional Sensor

OutputOutput Working Injector Working Injector

Test ProgramTest Program Controlled Injection Controlled Injection

and Ignitionand Ignition Plant Plant

CharacterizationCharacterization

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Thank you for Thank you for coming.coming.

Any Questions?Any Questions?