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Unread 12-30-2014, 06:06 PM   #11
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Default Re: Briggs Vanguard EFI project

Just a little example of the code that is required to read the analog sensors. The tach is a digital input and is read differently.

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Unread 12-30-2014, 06:21 PM   #12
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Default Re: Briggs Vanguard EFI project

Your talents never cease to amaze me Don. I know you answered this in another thread, but is there really anything you can't do???
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Unread 12-30-2014, 06:22 PM   #13
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Default Re: Briggs Vanguard EFI project

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Originally Posted by 93yellowclubcar View Post
Your talents never cease to amaze me Don. I know you answered this in another thread, but is there really anything you can't do???
I told you before... YES! But if I could do that, I'd never leave the house!
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Unread 12-30-2014, 07:06 PM   #14
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Default Re: Briggs Vanguard EFI project

A new 2-bar MAP sensor has been ordered!

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Unread 12-30-2014, 08:01 PM   #15
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Default Re: Briggs Vanguard EFI project

you do such cool things thank you for sharing them here
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Unread 12-30-2014, 08:36 PM   #16
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Default Re: Briggs Vanguard EFI project

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you do such cool things thank you for sharing them here
I'm not winning any Nobel prizes, but I am having fun!
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Unread 12-30-2014, 09:57 PM   #17
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Default Re: Briggs Vanguard EFI project

The injectors are fired with a PWM(pulse width modulated) output from the controller, through another circuit that can handle the extra current. A PWM circuit is a way for a digital output to simulate an analog output. By varying the amount of time that the digital output is ON vs OFF, it mimics an analog voltage. The amount of ON time vs OFF time is called "duty cycle". I have tried to describe it in this drawing.



Since the output is on for 80msec of the total 100msec cycle, that is an 80% duty cycle. That would simulate 80% of the 5dc signal, or 4vdc. That works great for things like varying the speed of motors, or dimming lights, but for injectors, it's a little different.
For the injectors, we only care how often we pulse them ON(frequency), and for how long they are ON(pulse duration). That determines the fuel flow based on a given fuel pressure, and injector rating. PWM works great for this, and that's what most automotive ECU modules use to control injectors.
What I need to do is write a program that can use the inputs from the sensors to calculate the proper frequency and pulse duration to fire the injectors at.
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Unread 12-30-2014, 10:09 PM   #18
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Default Re: Briggs Vanguard EFI project

We need to get together and have a beer or twelve this winter! I'll even bring the beer!
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Unread 12-30-2014, 10:11 PM   #19
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We need to get together and have a beer or twelve this winter! I'll even bring the beer!
Come on over! I love beer!
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Unread 12-30-2014, 10:12 PM   #20
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Default Re: Briggs Vanguard EFI project

I'm doing exhaust manifolds on a F150, once that's done were just waiting for snow! I'll pm you soon!
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