Creating a Microchip-Controlled Carburetor: Design Considerations and Components

  • Thread starter GiTS
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In summary, the conversation discusses creating a small 2 stroke engine controlled by a microchip. The plan is to use the existing carburetor and add a hotwire mass flow sensor, PIC microchip, and solenoid powered valve to keep the air to fuel mixture consistent. Suggestions are given for the type of PIC controller to use and the necessary inputs for engine speed and load. The conversation also mentions using feedback from exhaust O2 and provides a link to an experimental programmable electronic fuel injection controller for further experimentation. The question of what type of valve to use for controlling gasoline flow is also raised.
  • #1
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 consistant 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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  • #2
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.
 
  • #3
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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  • #4
(an experimental Do-It-Yourself programmable electronic fuel injection controller)
 
  • #5


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.
 

1. How does a PIC controlled carburetor work?

A PIC controlled carburetor is a type of carburetor that uses a microcontroller, specifically a PIC microcontroller, to regulate the air-fuel mixture in an engine. The microcontroller receives inputs from various sensors such as the throttle position sensor and the oxygen sensor, and then adjusts the amount of fuel delivered to the engine accordingly. This allows for more precise control of the air-fuel ratio and can result in better fuel efficiency and performance.

2. What are the benefits of using a PIC controlled carburetor?

One of the main benefits of using a PIC controlled carburetor is improved fuel efficiency. By constantly monitoring and adjusting the air-fuel ratio, the engine can operate at its optimal performance level, resulting in less wasted fuel. Additionally, a PIC controlled carburetor can also improve engine performance and reduce emissions.

3. Can a PIC controlled carburetor be used on any type of engine?

Yes, a PIC controlled carburetor can be used on any type of engine that uses a carburetor. However, it is most commonly used on small engines such as those found in motorcycles, lawnmowers, and other small vehicles. It can also be used on larger engines, but may require a more complex setup.

4. How is a PIC controlled carburetor different from a traditional carburetor?

A traditional carburetor relies on mechanical parts and adjustments to regulate the air-fuel mixture, while a PIC controlled carburetor uses a microcontroller and sensors to make precise adjustments. This allows for more accurate control and can result in better fuel efficiency and performance.

5. Can a PIC controlled carburetor be easily installed on a vehicle?

The installation of a PIC controlled carburetor will depend on the specific vehicle and the experience of the installer. In some cases, it may require some modifications or adjustments to the engine, while in others it may be a simple swap with the existing carburetor. It is recommended to consult a professional mechanic for proper installation and tuning.

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