[Diy_efi] Confused! Lost!

[Adam Wade]

--- bcroe at juno.com wrote:

> I'm guessing the motorcycle just uses a smaller,
> higher impedance peak and hold.  The driver has to
> be built around what injector will do.  

Understood.  I suppose this might be a good circuit to
dissect, since it appears to be able to drive any
sat-type injector with a p&h signal, although only at
low pulsewidth (?).  I wonder why they would do such a
thing, since it seemingly would cost as much to make a
circuit like that as it would to make a plain p&h
circuit and just use low-impedance injectors, no?

>> The impression I got (which could be all wrong) was
>> that using p&h drivers on sat injectors left you
>> with nothing more than a sat driving signal with a
>> lot of component overhead (and thus, cool
>> components).

> That's about right.  Maybe they are saving power. 

But...  If my understanding is correct, shouldn't they
appear to the scope to be sat injectors with a sat
driving signal, even at idle?

=====
| Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
|   http://y42.photos.yahoo.com/bc/espresso_doppio/lst?.dir=/   |
| "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     |

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