2
Project Goals
• Study the Microsquirt Project.• Adapt to Harley Davidson Motorcycles– Injection Timing– Specific Sensors and Signals
• Design our own EFI Controller• Design a convenient connection method• Simple End User Customization
4
What is a Microsquirt?
• Electronic Fuel Injection Controller• Derivative of Megasquirt– Compact– Less Driving Current– Suitable for Motorcycles– Snowmobiles– Lawn Mowers
• Programmable by End User
5
Why use a microsquirt?
• Optimize Engine Performance– Modify Fuel Maps– Tune injection timing– Adapt engine to add-in sensors– Increase Idle Speed
• Customize Components– Turbochargers– O2 Sensors– Different Fuel Types
7
Compilation & Programming• Compilation– Windows OS– Embedded code– GCC cross compiler– Cygwin– Downloader program– HCS12 header files
Compilation & Programming• Programming
1. Connect to a serial port2. Assert boot pin high3. Download program
8
CostSer. # Item Cost
1. Microsquirt $400.00
2. Connectors $100.00
3. PCB-layout board $83.00
4. PCB-Breakout Board $83.00
5. Parts from Digikey $120.00
Total Cost $786.00
9
Board LayoutEAGLE
• Easily Applicable Graphical Layout Editor
• CadSoft Computer, Inc.• Free (non-profit) version
has minor resitrictions• Schematic to connect on
board• Each component has
physical dimensions
10
11
Board Layout
Layout Specifications• Two layer board• Two separate ground planes to reduce noise
– Analog (High power 7.5A max)– Digital (Sensors , Serial)
• 1st version parts on 1 side• Standard 20 mil trace
– 100 mil for MOSFET drain to source– 9 mil on microcontroller
• Total board side 6.3x4”
Sample of board layout showing part of microcontroller, high power fets, analog ground plane, digital ground plane, and 35 pin AmpSeal connector. 12
Schedule
Course Goals• April 23
– Preliminary design review– Team citizenship assignment
• May 1– Snapshot poster and display
• May 9– Design report, webpage
review, logbook collection
Project Specific Goals• First Semester
– Build our Microsquirt board – Program Microsquirt – Advanced/Ahead of schedule
goal – connect to motorcycle
• Second Semester– Stimulator kit– Work out any issues – Run motorcycle
13
First Semester Schedule
Secondary Research (Engine)
Secondary Research (Microsquirt)
Preliminary Problem Definition
Preliminary Web Page
Schematic
Break
Board Layout
Detailed Problem Definition
Detailed Schedule
Conceptual Generation
Board Testing
Design Review
Snapshot
Design Report
Web Page
Logbook
Programming
Connect to Motorcycle
1/27 2/27 3/30 4/302/5
2/5
2/5
2/5
2/19
3/23
3/23
3/23
3/23
4/30
3/23
4/23
4/23
3/12
2/5
5/1
5/1
68
68
35
35
22
22
22
22
22
0
22
0
0
33
68
0
0
16
16
0
0
0
9
12
0
0
9
9
8
16
25
25
8
8
Start Date Completed Remaining 14
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