Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: kefan on 23 March 2009, 09:45:18

Title: Question about Motronic 1.5.4
Post by: kefan on 23 March 2009, 09:45:18: Hi,
I need to know what kind of signals are between ECU and injectors?
Same time (full-group), by pairs (half-group) or independent (sequential)?
The engine is X20SE, 8 valves, 115 hp.
Thanks a lot!
Title: Re: Question about Motronic 1.5.4
Post by: Marks DTM Calib on 23 March 2009, 09:58:21: Fully sequential PWM
Title: Re: Question about Motronic 1.5.4
Post by: kefan on 23 March 2009, 10:07:00: Quote
Fully sequential PWM

Thanks! But what does PMW mean?
Title: Re: Question about Motronic 1.5.4
Post by: Marks DTM Calib on 23 March 2009, 10:07:42: PWM....Pulse Width Modulation (standard fuel control delivery technique).
Title: Re: Question about Motronic 1.5.4
Post by: kefan on 29 March 2009, 20:58:04: Quote
Fully sequential PWM

Actually it is not possible to be sequential, because there is no camshaft sensor, so there is no any information about first piston top point.
I checked the signals with oscilloskope (2 channels) and the result is – full-group. All four injectors inject gasoline at the same time!
Ragards!
Title: Re: Question about Motronic 1.5.4
Post by: TheBoy on 29 March 2009, 21:00:42: I thought teh 1.5.x fired in pairs - sure thats what my old Astra GTE had, that fired in pairs...
Title: Re: Question about Motronic 1.5.4
Post by: RobG on 29 March 2009, 21:05:53: Quote
Quote
Fully sequential PWM

Actually it is not possible to be sequential, because there is no camshaft sensor, so there is no any information about first piston top point.
I checked the signals with oscilloskope (2 channels) and the result is – full-group. All four injectors inject gasoline at the same time!
Ragards!
Why ask the question then :D
Title: Re: Question about Motronic 1.5.4
Post by: kefan on 29 March 2009, 21:46:52: Because I was not sure… So I asked…
But is it possible to work as half-group (inject by pairs) at low and middle engine load, and as a full-group at cold start and full load?
[smiley=wink.gif] [smiley=wink.gif]
Title: Re: Question about Motronic 1.5.4
Post by: Kevin Wood on 30 March 2009, 12:06:44: Quote
But is it possible to work as half-group (inject by pairs) at low and middle engine load, and as a full-group at cold start and full load?

The injection times can overlap in a batch setup so there is no advantage to switching to a full group firing. Batched firing of the injectors does smooth the fuel delivery slightly so can give the pressure regulator a slightly easier time as only one pair of injectors opens / closes at a time.

Kevin