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Project Description
Project Background: The Polaris Outlaw 525 is one of the most high performing race ATV's on the market. With the KTM 525 cc engine and newly designed 5 speed manual transmission, Polaris is moving to the forefront of the ATV race industry. The Automatic Shift Controls project is a 3rd Generation project to build upon current button shift modifications to move toward intelligent shifting for the manual transmission. Traditionally, the manual transmission is more efficient for race conditions however the automatic shift controls would provide the quick, smooth shifting of an automatic transmission with a manual user input interface for button shift racing. The system will need to be functional and practical
Problem Statement: An automatic shift control system with manual override designed for race as well as general use. The system must me light, fast , smooth and add no extra maintenance to racing duty cycles.
Objectives/Scope: 1. Evaluate current design for possible cost and
weight reduction as well as improved performance.
2. Investigate RPM shift points that are safe and efficient for general and race conditions.
3. Create more attractive and functional packaging that has no obstruction to vehicle or driver.
4. Leave project in a manner in which it can be picked up easily by another team or by the people at Polaris.
Deliverables: • Investigate and program new automatic shift
controls. • Integrate current push button control for
manual override function. • Conduct cost and weight analysis.
Expected Project Benefits: • Automatically shifts a manual transmission
which is traditionally more efficient for race conditions
• Shift control does not require user input for shifting, manual override integration gives user the option to input shift change
Core Team Members: • Ashley Shoum- Project Lead • Keith Cobb • Matt Dombovy-Johnson • Jonathan Willistein • Feng Li • Bibhu Shah • Sarah Bicho
Strategy & Approach
Assumptions & Constraints: 1. Current controller is sufficient for testing and
mounting new automatic controls. 2. Current design is sufficient for use as
manual override feature.
Issues & Risks: • Previous phase went out of budget
constraints, cost analysis for manufacturability will need to be carefully reevaluated.
• Electrical/Computer engineer staffing requests not met. Project will require heavy portion of programming and project has only two electrical engineers. Background will need to be assessed.
• Previous phase hardware and software may not be able to be used for new phase in which design may be more intensive than planned and project scope will need to be reevaluated.
Project # Project Name Project Track Project Family
P09310 Automatic Shift Controls for ATV
Systems and Controls
Modular, Scalable, Open Architecture Control Systems
Start Term Team Guide Project Sponsor Doc. Revision
2008-1 Professor George Slack Polaris Industries 2
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General Mode
Shift Dir?
Can we UpShift?
Can we DownShift?
DownUp
Throttle/RPM Input
Bad Shift Indicator
No
LED Indicator
Cut Spark(Disengage clutch)
Yes Yes
Spark Pulldown Signal
Cut Spark(Disengage clutch)
Open Up-solenoid,Close Down-
solenoid for X secs
Close Up-solenoid, Open Down-
solenoid for X secs
Release Spark Pulldown SignalEnable Spark(Engage clutch)
Update Gear In software
CDI
Need to Shift?No
Reset/ Power-onAutocheck RPM/
TPS
X secsX=0.1s
Display
Shift Limits
DisplayGear Signal (R,N,1,2,3,4,5)
Button pressed?No
Yes
Yes
Spark Pulldown Signal
AutoShift On?
Yes
No
RPM 7600
RPM 7600
RPM 7300
RPM 7000
RPM 3000
RPM 9500
Maximum Downshift Speed
[5 to 4]Maximum
Downshift Speed [4 to 3]
Maximum Downshift Speed
[3 to 2]Maximum
Downshift Speed [2 to 1]
Minimum Upshift Speed
Maximum Upshift Speed
Gear Sensor
Gear Sensor
Shift Map(Moderate)
150 in-lbs20 deg rot. Trans.
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Microcontroller Schematic
MS
P43
0
RPM(Digital Input)
0 - 0.3V
TPS(Analog Input)
0 - 12V
Gear Sensor
Clutch Signal
3-Position Switch(Race, General, Off)
Gear Indicator(P R N 1 2 3 4 5)
solenoids
Bad Shift Indicator
About-to-shift Indicator
Voltage Regulator(3.6V)
Voltage Divider12 => 3.6V
12V
ADC DAC
12
Spark-Cut Circuit
12V
Driver