[Diy_efi] Measuring Pulse Width/Duty Cycle of an Injector?

[jim cottrill]

Marcello
Sorry for the late post on this. 
Someone inquired as to the accuracy of the posted pulse width meters.
The one I posted "PWMETER" that used a 16f876 counts 1 us clock pulses,
so I think it will provide the accuracy you need and then some.

 
t
-----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: Tuesday, May 24, 2005 7:11 AM
To: diy_efi at diy-efi.org
Subject: RE: [Diy_efi] Measuring Pulse Width/Duty Cycle of an Injector?

Honda Acura OBD 0 cars used a system of Peak and pulse width modulate.
I
am not sure if this was or is a bosch system.  I didn't know I was going
to have to deal with these until I was halfway done with everything
else. 
All I know is it sucks.  The later type used in OBD I cars just reduces
the voltage.  And doesn't make my head hurt.

Marcello



> --- Steve Ravet <Steve.Ravet at arm.com> wrote:
>
>> I haven't see all driver circuits out there but I
>> think most of them don't duty cycle the injector,
>> they just reduce the voltage applied to the
> injector.
>
> The only designs I have seen that do this are Bosch
> systems.  The advantage is that the output transistor
> is always driven at 100%, when driven (duty cycle is a
> straight square wave), so heat is greatly reduced over
> a regular P&H setup.  The drawback is broadband EMF.  :(
>
> | 82 Honda CX500 Turbo (Cassandra)  90 Kwak Zephyr 550 (Daphne) |
> | "It was like an emergency ward after a great catastrophe; it  |
> |   didn't matter what race or class the victims belonged to.   |
> |  They were all given the same miracle drug, which was coffee. |
> |   The catastrophe in this case, of course, was that the sun   |
> |     had come up again."                    -Kurt Vonnegut     |
> | M/C Fuel Inj. Hndbk. @ Amazon.com -  http://tinyurl.com/6o3ze |
>
>
>
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