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Analog electronic fuel injection. (solved)

MarcWolfe

I need a circuit held at 5 volts and sent low by a ground trigger, that can't be indefinitely held low if the trigger is indefinitely held low. It needs a fixed (but adjustable) fall and rise time, and needs to rise immediately after hitting 0 volts. Why? Fuel injection without software... analog fuel injection. The circuit I just described will be compared against a 0-5 volt single from a MAP sensor; the amount of time the MAP sensor voltage is higher will dictate how long the injector is powered on. Should be about as performant as mechanical fuel injection.

 

A monostable 555 timer is inadequate because if the engine isn't running and the crank sensor is held low because the crank is resting in that position, the fuel injector will stay on and continually dump fuel.

(edit: I'd also like to avoid the pulse width of the crank trigger varying the pulse described above.)

 

Yes, I know about Speeduino; I'll get around to that at some point after sorting the details of which one can get me fully sequential fuel and coil on plug with an 8 cylinder and still be capable of more (more being transmission control mostly). 

 

A more long winded explanation of the logical process I'm going for with the circuit can be found here https://www.facebook.com/marc.wolfe.568/posts/1570962223103108 feel free to reply here or there, idc

 

 

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16 minutes ago, MarcWolfe said:

Fuel injection without software... analog fuel injection.

What is this for?

Gaming With a 4:3 CRT

System specs below

 

CPU: AMD Ryzen 7 5700X with a Noctua NH-U9S cooler 
Motherboard: Gigabyte B450 Aorus M (Because it was cheap)
RAM: 32GB (4 x 8GB) Corsair Vengance LPX 3200Mhz CL16
GPU: EVGA GTX 980 Ti SC Blower Card
HDD: 7200RPM TOSHIBA DT01ACA100 1TB, External HDD: 5400RPM 2TB WD My Passport
SSD: 1tb Samsung 970 evo m.2 nvme
PSU: Corsair CX650M
Displays: ViewSonic VA2012WB LCD 1680x1050p @ 75Hz
Gateway VX920 CRT: 1920x1440@65Hz, 1600x1200@75Hz, 1200x900@100Hz, 960x720@125Hz
Gateway VX900 CRT: 1920x1440@64Hz, 1600x1200@75Hz, 1200x900@100Hz, 960x720@120Hz (Can be pushed to 175Hz)
 
Keyboard: Thermaltake eSPORTS MEKA PRO with Cherry MX Red switches
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6 hours ago, MadAnt250 said:

What is this for?

... anything, but my first go will either be with a Honda GCV 190, or a chainsaw.

EDIT: Forgot I have an 18.5 HP Briggs Intek; that'd be better for me to try this on. 540cc with a charging coil.

Edited by MarcWolfe
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15 minutes ago, MarcWolfe said:

... anything, but my first go will either be with a Honda GCV 190, or a chainsaw.

It seems like too much work and money to do, there are kits you can buy to convert from carb to fuel injection.

Gaming With a 4:3 CRT

System specs below

 

CPU: AMD Ryzen 7 5700X with a Noctua NH-U9S cooler 
Motherboard: Gigabyte B450 Aorus M (Because it was cheap)
RAM: 32GB (4 x 8GB) Corsair Vengance LPX 3200Mhz CL16
GPU: EVGA GTX 980 Ti SC Blower Card
HDD: 7200RPM TOSHIBA DT01ACA100 1TB, External HDD: 5400RPM 2TB WD My Passport
SSD: 1tb Samsung 970 evo m.2 nvme
PSU: Corsair CX650M
Displays: ViewSonic VA2012WB LCD 1680x1050p @ 75Hz
Gateway VX920 CRT: 1920x1440@65Hz, 1600x1200@75Hz, 1200x900@100Hz, 960x720@125Hz
Gateway VX900 CRT: 1920x1440@64Hz, 1600x1200@75Hz, 1200x900@100Hz, 960x720@120Hz (Can be pushed to 175Hz)
 
Keyboard: Thermaltake eSPORTS MEKA PRO with Cherry MX Red switches
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14 minutes ago, MadAnt250 said:

It seems like too much work and money to do, there are kits you can buy to convert from carb to fuel injection.

This is too much money, but a conversion isn't? You kidding me?

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I found what I needed. Going to be a pain in the ass without an oscilloscope. Should work for setting dwell time on the ignition coil when I add that too. DC filtering capacitor with a resistor to adjust the duration (potentiometer to make it adjustable).

 

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10 minutes ago, MarcWolfe said:

This is too much money, but a conversion isn't? You kidding me?

I was thinking of the trial and error phases of experiment, and the parts needed. (Unless you are buying everything used)

Gaming With a 4:3 CRT

System specs below

 

CPU: AMD Ryzen 7 5700X with a Noctua NH-U9S cooler 
Motherboard: Gigabyte B450 Aorus M (Because it was cheap)
RAM: 32GB (4 x 8GB) Corsair Vengance LPX 3200Mhz CL16
GPU: EVGA GTX 980 Ti SC Blower Card
HDD: 7200RPM TOSHIBA DT01ACA100 1TB, External HDD: 5400RPM 2TB WD My Passport
SSD: 1tb Samsung 970 evo m.2 nvme
PSU: Corsair CX650M
Displays: ViewSonic VA2012WB LCD 1680x1050p @ 75Hz
Gateway VX920 CRT: 1920x1440@65Hz, 1600x1200@75Hz, 1200x900@100Hz, 960x720@125Hz
Gateway VX900 CRT: 1920x1440@64Hz, 1600x1200@75Hz, 1200x900@100Hz, 960x720@120Hz (Can be pushed to 175Hz)
 
Keyboard: Thermaltake eSPORTS MEKA PRO with Cherry MX Red switches
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11 minutes ago, MadAnt250 said:

I was thinking of the trial and error phases of experiment, and the parts needed. (Unless you are buying everything used)

Not buying ACDelco and Bosch etc.

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