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Controlling Speed Mechanically. Engr 315 Control Systems Calvin College 8 December 2004 Brian Katerberg Andy Vander Moren. The Original Governor. James Watt’s Flyball Governor. Used to prevent steam engines from overheating while responding to the applied loads.

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Controlling speed mechanically

Controlling SpeedMechanically

Engr 315

Control Systems

Calvin College

8 December 2004

Brian Katerberg

Andy Vander Moren


The original governor
The Original Governor

James Watt’s

Flyball Governor

Used to prevent steam engines from overheating while responding to the applied loads.

http://home.carolina.rr.com/microhydro/governors.html


Modern governor
Modern Governor

http://home.carolina.rr.com/microhydro/governors.html


Electrical speed controls
Electrical Speed Controls

  • Tachometer

  • Automotive Cruise Control

  • Andy Wallner’s Presentation Yesterday


Why use an electronic governor
Why Use an Electronic Governor?

  • Allows for very precise governing

  • Requires very limited amount of moving parts

  • Can fit in small areas

  • Easy to adjust for changes in application

  • Interfaces easily with other controlling devices


Why use a mechanical governor
Why Use a Mechanical Governor?

  • Could be less expensive

  • Can use in wide range of conditions

    • Marine Applications

    • Extreme Temperatures

  • Usually easier to troubleshoot

  • More transparent


Mechanical governor shortcomings
Mechanical Governor Shortcomings

  • Have a delayed response time called “droop”

  • This delay in response time induces something called “hunting”

    • Can be thought of in terms of overshoot and over/under damping

    • Can tune a mechanical system to minimize hunting using additional external mechanical governors



Relation to our senior design project
Relation to Our Senior Design Project

  • We are building a winnowing machine for use in Kenya

  • Need some sort of governing device to control the speed of our fan

  • Device must be simple, easy to use, and low cost

  • Kenyan’s background should be taken into account especially for repairs

    • Not much electrical experience

    • Bikes are major form of transportation


Governors in bikes

There Can Be!

Governors…in Bikes?

Di2 (Digitally Integrated Intelligence)

Automatic Derailleur

www.shimanocycling.com




Questions

Mechanical

Governor

A Governor on a Bike

Questions?


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