 help with electronic delay
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kell
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Registered Member #142
Joined: Sat Feb 11 2006, 01:19PM
Location:
Posts: 102
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I'll post an example of an RC delay circuit, just because it so happens I drew one up last night in notepad. This is for an "autopurge" in a waste vegetable oil conversion of a diesel engine. When you turn off the ignition switch, the engine continues to run for a time of a few seconds to a minute or two (that you can set with a potentiometer). This runs in conjunction with a solenoid and valve that changes the fuel from wvo to diesel when you turn off the ignition key. During the run-on time, the conventional diesel fuel purges the wvo from the engine so it doesn't gum up when it gets cold.
12 volts
from
battery
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__|__
12 volts from | |
ignition switch |relay|------output
| |_____|
| common |
| diode _|D
| (e.g. 1N4001) | n-channel
'----1K resistor--------->|------+-------+-------+------|| mosfet
| | | |_ (e.g. IRF540)
| | | |S
100 uF ----- | 15 volt |
electrolytic----- | zener diode |
capacitor | potentiometer| |
| 50 or 100K | |
| | | |
| | | |
| | | |
'---+---+-------+---------'
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ground
This circuit isn't exactly what you asked for. I posted it just to demonstrate the principle.
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Wolfram
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Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
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What circuit are you using for the voobing?
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Maz
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Registered Member #111
Joined: Fri Feb 10 2006, 01:04AM
Location: Menasha,Wisconsin
Posts: 65
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this circuit is the one for it. but unless there is a better one...
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