[Diy_efi] EFI system data

[bill.shurvinton at nokia.com]

www.bgsoflex.com/megasquirt.html

Chose an MCU with PWM outputs, much easier. OR use the tried and trusted =
ballast resistor method. I have yet to see measured data to show that =
this is any worse than a true peak and hold driver or PWM system. The =
inference being that, for OEMs the circuitry of a P&H driver was cheaper =
than a bank of big power resisitors.

Bill

-----Original Message-----
From: ext Kent Martin [mailto:kentmartin at froggy.com.au]
Sent: 24 July 2002 08:03
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] EFI system data


What's an MS style PWM?
I'm using a micro to generate the PWM.
I may run into trouble generating 10-15% duty because
of processor load, will 50% kill the injector.
Kent.
----- Original Message -----
From: <bill.shurvinton at nokia.com>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, July 23, 2002 10:39 PM
Subject: RE: [Diy_efi] EFI system data




-----Original Message-----
From: ext Bruce [mailto:nacelp at bright.net]
Sent: 23 July 1995 13:02
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] EFI system data



----- Original Message -----
From: "Kent Martin" <kentmartin at froggy.com.au>
<SNIP>

If you are using a MS style PWM to provide the hold current then start =
at
1Amp per injector, which is 10-15% duty cycle for a 2Ohm injector. =
Adjust
till it works. Once you are tuned in, it may be worth backing off a =
little
until you reach a minimum reliable hold current.

Bill

> What is the duty cycle required to keep the average injector open
(assuming
> a 20 Khz frequency)?

20KHz?  Your not goin find and injector to operate at that speed.
Bruce
>
> Kent.



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