How do our Injectors operate? All 6 have common Ground and each has pulsed 12V?
08-24-2004, 06:03 AM
#1
AudiWorld Expert
Thread Starter
How do our Injectors operate? All 6 have common Ground and each has pulsed 12V?
and they inject for the time while this 12V is applied?
It seems that some other cars possibly have common 12V connection and switching Ground.
Can anyone confirm or deny our injector's operation?
It seems that some other cars possibly have common 12V connection and switching Ground.
Can anyone confirm or deny our injector's operation?
08-24-2004, 09:34 AM
#3
AudiWorld Super User
Join Date: Apr 2003
Posts: 3,138
Likes: 0
Received 0 Likes
on
0 Posts
Yep. Most ECUs have "open collector" outputs that sink current to gound...
... for the high current "outputs" at least like injectors, ISVs, coils, etc.
An "open collector" output is basically just a NPN power transistor that acts like a switch closing the connection to ground. This type of drive circuit is cheap and reliable and doesn't generate a lot of heat in the ECU.
An "open collector" output is basically just a NPN power transistor that acts like a switch closing the connection to ground. This type of drive circuit is cheap and reliable and doesn't generate a lot of heat in the ECU.
Thread
Thread Starter
Forum
Replies
Last Post
sdb90
12v V6 Discussion
0
05-16-2009 07:10 AM
MikeB490
Audi 90 / 80 / Coupe quattro / Cabriolet
0
08-23-2004 11:06 AM