[Diy_efi] Measuring Pulse Width/Duty Cycle of an Injector?
Mike
niche
Sun May 22 18:29:26 UTC 2005
At 08:32 PM 22/05/05, you wrote:
>I have seen a kit that converts a P&H waveform into an equivalent simple
>pulse waveform, expressly for the purpose of duty cycle measurement. It
>uses a dual op-amp IC and a handful of other small components. I have a
>magazine article that
Sorry I'm missing something here - whats P & H ?
Did u mean Pulse Width ?
Regards from
Mike Massen
Perth, Western Australia
VL Commodore Fuse Rail that wont warp or melt !
Twin Tyre rims and tyres for sedans
http://niche.iinet.net.au
>describes it. Let me know if you need more info, or contact me off-list if
>you'd like the name of the kit retailer.
>
>Cheers
>
>-----Original Message-----
>From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
>Behalf Of Marcello A. Belloli
>Sent: Sunday, 22 May 2005 1:01 PM
>To: diy_efi at diy-efi.org
>Subject: [Diy_efi] Measuring Pulse Width/Duty Cycle of an Injector?
>
>Hello Everyone,
> I'm still working on a datalogger project. Been doing a lot of the
>software while I've been on vacation in Thailand. I'm still on
>vacation, but can't keep my mind off of this project. I'm using a
>PIC18F452 as the Micro behind my datalogger. I've got just about
>everything working. The one place I'm having problem is the
>understanding of how to read pulse width of a fuel injector.
> Is there a way of looking at all types of injectors, that will allow
>for an accurate account of timing? I've been looking at two type of
>injector firing. Low resistance injectors, which use a driver that
>duty cycles the injectors after the main firing to keep the current
>within limits. And Higher resistance ones where the resistance alone
>keeps the current down. Now how do you look at firing time of an
>injector when the driver starts to duty cycle it after 1.2ms?
> I guess I have one more question too - What is the best way to
>connect to a circuit like an injector driver output? I figure I only
>really need timing information. I want to keep the voltage between
>0-5 volts and apply as little load to the circuit as possible.
> After looking at this I can understand why my multimeter that has a
>PulseWidth setting has trouble sometimes.
> Any ideas would be great. Thanks, Marcello
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Regards from
Mike Massen
Perth, Western Australia
VL Commodore Fuse Rail that wont warp or melt !
http://niche.iinet.net.au
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