Creating a Microchip-Controlled Carburetor: Design Considerations and Components

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Discussion Overview

The discussion revolves around the design considerations and components necessary for creating a microchip-controlled carburetor for a small two-stroke engine. Participants explore various aspects of integrating electronic control with traditional carburetor systems, focusing on components, control mechanisms, and potential challenges.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant proposes using an existing carburetor with modifications, including a hotwire mass flow sensor, a PIC microchip, and a solenoid-powered valve, while seeking advice on the appropriate PIC controller and specifications.
  • Another participant emphasizes the importance of atomization in the carburetor's function and suggests that inputs for engine speed and load would be beneficial for control, mentioning possible methods for obtaining these inputs.
  • A suggestion is made to explore existing programmable electronic fuel injection systems as a reference for the project.
  • A participant inquires about suitable types of electronically controlled valves for gasoline flow, highlighting the need for size, precision, and corrosion resistance.

Areas of Agreement / Disagreement

Participants express various ideas and suggestions, but no consensus is reached on specific components or design approaches. Multiple competing views and considerations remain unresolved.

Contextual Notes

Limitations include the need for clarity on the specific requirements for engine control, the potential complexity of integrating various sensors and feedback mechanisms, and the dependency on the definitions of terms like "atomizing" in the context of carburetor function.

Who May Find This Useful

Individuals interested in DIY engine modifications, electronic control systems, and those exploring fuel management solutions for small engines may find this discussion relevant.

GiTS
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What would it take to make a small 2 stroke controlled by microchip? I've been thinking of using the existing carburetor and taking out everything except the throttle and gas lines and adding an improvised hotwire mass flow sensor, PIC microchip, and solenoid powered valve. It doesn't have to be as complicated as the system your car might use, just something to keep the air to fuel mixture consistent except for cold starting and maybe idle. What kind of PIC controller should I use? How many I/O lines should I need and how much memory? Suggestions?
 
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Sounds a nice little project. Can't help you too much with the electronics, but remember that the carburettor isn't just metering the fuel, it's atomising it.

Depending on what the application is, and how much control you want, you'd probably want inputs for engine speed and load. Speed you could take from the flywheel, and load could be inferred from manifold density, guessed-at from throttle position, or measured (hot wire could work very nicely). You might also want some kind of feedback loop based on exhaust O2 or something.
 
Why not experiment with this as well.

http://www.kelsey-forums.co.uk/cgi-bin/cmm/YaBB.pl?action=dereferer;url=http://www.megasquirt.info/
 
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(an experimental Do-It-Yourself programmable electronic fuel injection controller)
 


What kind of valve should I use to control the gasoline flow? It has to be fairly small, electronically controlled, and precise as well as being able to handle corrosive gasoline.
 

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