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Author Topic: Question about Motronic 1.5.4  (Read 1315 times)

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kefan

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Question about Motronic 1.5.4
« 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!
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Marks DTM Calib

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Re: Question about Motronic 1.5.4
« Reply #1 on: 23 March 2009, 09:58:21 »
Fully sequential PWM
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kefan

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Re: Question about Motronic 1.5.4
« Reply #2 on: 23 March 2009, 10:07:00 »
Quote
Fully sequential PWM

Thanks! But what does PMW mean?
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Marks DTM Calib

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Re: Question about Motronic 1.5.4
« Reply #3 on: 23 March 2009, 10:07:42 »
PWM....Pulse Width Modulation (standard fuel control delivery technique).

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kefan

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Re: Question about Motronic 1.5.4
« Reply #4 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!
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TheBoy

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Re: Question about Motronic 1.5.4
« Reply #5 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...
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RobG

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Re: Question about Motronic 1.5.4
« Reply #6 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
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kefan

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Re: Question about Motronic 1.5.4
« Reply #7 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]
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Kevin Wood

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Re: Question about Motronic 1.5.4
« Reply #8 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
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