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methley
a.k.a. Big Hairy Ski Monster
Member Since: 07 Oct 2008
Location: Marshfield, South Glos
Posts: 2433
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Ok, here's today's obscure questions for you...
1, Is there anyone out there who knows what the frequency and magnitude of the PWM signal is which operates the EGR valves?
2, Can anyone confirm what the range of resistance values are for the feedback resistor in the EGR valves (I think it's 300 - 2500 ohms).
3, Which way around is this resistance? Is it high when the PWM signal is at 100% or the other way around?
Cheers,
Andy Andy
Fridge Slide for sale https://www.disco3.co.uk/forum/post2064622.html#2064622
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6th Nov 2009 3:49 pm |
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Frapp
Member Since: 19 Dec 2008
Location: Norff Zummerzet
Posts: 1655
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Andy
You lost me on that one
I'll stick to driving JCB's
Ray
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6th Nov 2009 5:45 pm |
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stapldm
Member Since: 11 Sep 2006
Location: Swine Town
Posts: 2330
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Methley, some guesswork here...
1a. You can hear the tone of the servo's under the bonnet immediately after switch off, so I'm going to assume several kHz.
1b. Going to stab at 12V; for maximum PMW torque and hence fastest reaction, you need highest volts; so assuming no voltage multipliers, it's going to be +ve battery voltage.
2 & 3. Not a scooby
Someone with an oscilloscope and test meter could answer better. Dr. Ian Malcolm:
"Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should."
Transgenic tomato anyone?
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6th Nov 2009 9:09 pm |
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ad15
Member Since: 14 Dec 2008
Location: up that tree
Posts: 4866
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3 kangaroo's and a haddock....
Ok monkeysocks??? one wife.......livid
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6th Nov 2009 9:19 pm |
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