https://wiki.proz.com/kudoz/english-to-polish/automotive-cars-trucks/6707332-harmonics-in-the-valve-train.html

harmonics in the valve train

Polish translation: drgania harmoniczne w układzie rozrządu

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:harmonics in the valve train
Polish translation:drgania harmoniczne w układzie rozrządu
Entered by: Crannmer

14:32 Sep 12, 2019
English to Polish translations [PRO]
Tech/Engineering - Automotive / Cars & Trucks
English term or phrase: harmonics in the valve train
One of the common trigger problems that we see is from the Nissan 360 degree optical trigger system which I've got here in front of me. This is a cam angle sensor that's fitted to the engine. Hopefully on the GoPro footage here you'll be able to get a pretty good indication of what this trigger disc looks like.

But essentially this gives the ECU two pieces of information. On the outside of the trigger disc there are 360 tiny little slots. Remembering that this is fitted to the cam shaft so it's operating at half engine speed and the ECU is going to see 180 of these slots per engine revolution. On the inside we also have a range of slots which tell the ECU which cylinder is firing, where abouts in the engine cycle the engine is at any particular point. Now while this does work quite well in factory engines and there's certainly the Nissan ECU decodes this system quite well.

It's got a high tooth count, so it's got a lot of detail allowing potentially very very accurate control of fuel and ignition. The problem comes in that when we start modifying the engine particularly if we fit larger cams this can cause harmonics in the valve train and this can cause essentially an oscillation in the trigger disc, it's going to move backwards and forwards at high speed and this can confuse the ECU, it's going to get multiple inputs where it should be expecting less. And it's going to see too many or too few reference teeth of reference inputs between each of the synchronization inputs. So what this does is it presents a situation where the ECU isn't really 100% sure what's going on. And an aftermarket ECU will quite often log trigger faults or synchronization faults as a result of this.
wachus
Poland
Local time: 03:01
drgania harmoniczne w układzie rozrządu
Explanation:
j.w.
Selected response from:

Crannmer
Local time: 03:01
Grading comment
Dziękuję bardzo
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Summary of answers provided
4 +1drgania harmoniczne w układzie rozrządu
Crannmer


  

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45 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +1
drgania harmoniczne w układzie rozrządu


Explanation:
j.w.

Crannmer
Local time: 03:01
Specializes in field
PRO pts in category: 926
Grading comment
Dziękuję bardzo

Peer comments on this answer (and responses from the answerer)
agree  Frank Szmulowicz, Ph. D.
1 hr
  -> thx
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