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Common Rail Diesels

Andy.MacFadyen
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6 years 5 months ago - 6 years 5 months ago #14758 by Andy.MacFadyen

Common Rail Diesels was created by Andy.MacFadyen

As my own car is now common rail diesel I thought I better get up to speed on them and found a website with a good training slide show by Tony Kitchen of AK Training giving a concise briefing on the Common Rail system Link to Slide Show

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Last edit: 6 years 5 months ago by Andy.MacFadyen.

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Noah
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Give code definitions with numbers!

6 years 5 months ago #14771 by Noah

Replied by Noah on topic Common Rail Diesels

Wow, score! Thanks Andy

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Andy.MacFadyen
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6 years 5 months ago - 6 years 5 months ago #15125 by Andy.MacFadyen

Replied by Andy.MacFadyen on topic Common Rail Diesels

I did some captures interesting this is the injector amps waveform at idle --- not sure what the features are yet but it is good to ave a known good

Under hood intermediate pressure electric fuel pump amps.

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Ben
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6 years 5 months ago #15126 by Ben

Replied by Ben on topic Re:Common Rail Diesels

Hey Andy that's a weird looking injector current for sure ! Whats the deal on the pump I see it seems to be every 4th is lower current is this a dying pump or a release in load? I thought pumps were usually 8 segments per revolution?

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Andy.MacFadyen
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6 years 5 months ago - 6 years 5 months ago #15129 by Andy.MacFadyen

Replied by Andy.MacFadyen on topic Re:Common Rail Diesels

What I think is happening with the fuel pump is it feeds into a 3 lobe mechanical pump and the variation is due to the intake strokes of the pump, I am going to try to confirm that either by getting a waveform from the net or jumping the pump relay to run it engine off.

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Last edit: 6 years 5 months ago by Andy.MacFadyen.

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Andy.MacFadyen
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6 years 5 months ago #15134 by Andy.MacFadyen

Replied by Andy.MacFadyen on topic Re:Common Rail Diesels

I found a couple of pages on the web that explain complex injector current pattern, the injector opens twice, the first is the pre or pilot injection the second is the main injection. In addition some common rail engines use a post injection pulse to clean up the emisions .

Pico site www.picoauto.com/library/automotive-guid...sch-current-at-idle/
Crypton site www.crypton.co.za/Tto%20know/Actuators/injectors.html

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Ben
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6 years 5 months ago #15141 by Ben

Replied by Ben on topic Re:RE: Re:Common Rail Diesels

that makes me want to take a look at my vw diesel injector current and see what it looks like. The injection pump sure makes sense on that pump current.

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Andy.MacFadyen
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6 years 5 months ago - 6 years 5 months ago #15146 by Andy.MacFadyen

Replied by Andy.MacFadyen on topic Re:RE: Re:Common Rail Diesels

I will need to run a test on the pump with the engine off to be 100% sure on the pump wave form if I get time at the weekend I will. Pico's Frank Massey has an interesting simple testing method the common rail pressure sensor output voltage I will also give that a go.

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Last edit: 6 years 5 months ago by Andy.MacFadyen.

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Andy.MacFadyen
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6 years 5 months ago #15149 by Andy.MacFadyen

Replied by Andy.MacFadyen on topic Re:RE: Re:Common Rail Diesels

Comon rail pressure sensor test, following Frank Massey of Pico's method --- although I only max RPM for a second or so. A good simple test.
www.picoauto.com/library/automotive-guid.../common-rail-diesel/

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Landroverman1958
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6 years 5 months ago #15191 by Landroverman1958

Replied by Landroverman1958 on topic Re:RE: Re:Common Rail Diesels

Hi Andy,i,ve been taking what i call a quite a few standard fuel pressure pattern or profile for quite a few years,the interesting thing is the high pressure profile(pattern)for a high pressure petrol as in the ecoboost engine is the same as a common rail diesel,
best wishes from Mid Wales
Peter(good luck tomorrow against the Austrailians)

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Ncautoshop
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6 years 5 months ago #15199 by Ncautoshop

Replied by Ncautoshop on topic Re:Common Rail Diesels

We're primarily a diesel shop. If there's any thing you may be interested in I likely have captures or can get it rather quickly!

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scopeman
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6 years 4 months ago - 6 years 4 months ago #15386 by scopeman

Replied by scopeman on topic Re:Common Rail Diesels

Hi i have had this pdf for a while when i was looking at furthering my knowledge on Diesel systems and testing.Here is a follow up to the pdf if any use. www.google.co.uk/url?sa=t&rct=j&q=&esrc=...SXvwnHm77yycdVP7-3TI The link opens the pdf called Common rail diesel diagnostics
quick health check
by AK Training .

Last edit: 6 years 4 months ago by scopeman.

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