Problem in my PC-based EFI....

[steve ravet]

I guess you've got a carb or something to run the engine while you watch
the injectors/LEDs?

So the LEDs light up no matter how short the pulse, but the injectors
only click with a pulsewidth of 5ms or more?  Are the LEDs before the
injector driver or after?  Are these high or low impedance injectors? 
Is your driver a peak and hold driver?  Do you have a scope?  It sounds
to me like either your driver is bad, or your injectors are bad.  They
do have a minimum pulsewidth, but I think it should be like 1-1.5 ms,
not 5 ms.

--steve

Socket7 wrote:
> 
> Dear all,
> I have a serious probem (especially for me !! because i have no background
> in electronic science....) with my pc-based EFI. Before I explain what my
> problem is, I will explain what kind of stuff that I used on my pc-based EFI
> 
> 1. A PC with Processor AMD K6 200 Mhz, SDRAM Visipro 32 MBytes.
> 2. A disc with 2 hole that fitted on camshaft as a speed sensor and
> position sensor (just for trigger).
> 3. A Thermistor as a Temperatur Sensor
> 4. A Mass Air Flow Sensor.
> 5. A Throttle Sensor.
> 6. Some signal conditionings.
> 7. A DAS (Data Acquisition System) Card, that use MAX 180 ACPL
> 8. Parallel Port as an output port to the driver of fuel injectors.
> 9. Driver for fuel injector.
> 11. Daihatzu Zebra 1600 cc engine.
> 10. Borland Pascal for writing my software.
> 
> Because of some damages on 2 of 4 main injectors, I can't use my pc-based
> efi to a real engine. Then I use 5 leds that act as injectors (4 leds that
> act as main injectors and 1 led that acts as a cold start injector). But I
> still use 2 injectors, that also have been connected to driver.... 1
> injector represents 1 of 4 main injectors and 1 injector represents cold
> start injector.
> 
> Fyi, others sensor still connected to real engine.... only injectors that
> represented by leds. In my software, beside I do some mathematic equations
> to determine fuel injection time, I also write tasks to show engine
> conditions  (engine speed, engine temperatur, mass air flow, mass of air,
> mass of fuel and injection time) on the display / monitor.
> 
> When I start the engine.... everything is working properly, except the
> injectors. It never work, although the leds work. Then I try to slow down
> the injection time (NOT the engine !!! I can do it, as long as it doesn't
> exceed the maximum injection time). I mean, if the injection time is 3
> miliseconds, then I slow down it to 5 milisecond. And it works... the
> injectors can work properly !!
> 
> Can anyone on the milist explain me, what's wrong with my pc-based efi ???
> I really need someone to explain it.
> 
> Sorry for my poor English.... :-)
> (English is not my first language... hehehe... it's not a good reason, it is
> ??)
> 
> Thank you,
> Novan Ananda
> ulet_ijo at yahoo.com
> beebob.geo at yahoo.com
> 
> ps.
> please contact me if you need further information... you can send mail to my
> personal address, ulet_ijo at yahoo.com
> 
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-- 
Steve Ravet
steve.ravet at arm.com
ARM,Inc.
www.arm.com
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