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| SV Talk, Tuning & Tweaking Discussion and chat on all topics and technical stuff related to the SV650 and SV1000 Need Help: Try Searching before posting |
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12-03-16, 06:47 PM
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#11 |
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Member
Mega Poster
Join Date: Jul 2008
Location: here as devil's advocate
Posts: 11,540
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Re: What does the TPS actually do?
send an email to suzuki and ask them for an explanation. i'm sure they will oblige.
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12-03-16, 07:59 PM
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#12 | |
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Member
Join Date: Jul 2010
Location: Devon
Posts: 876
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Re: What does the TPS actually do?
Quote:
The SV uses an engine load sensing scheme called Alpha-N (alpha=throttle angle, N=engine RPM) to estimate how much air the engine is consuming, so it can work out how much fuel to inject. This means the throttle position sensor is a primary sensor for the fuel injection, it has no other way to determine the engines air demand. At low RPM, a tiny throttle opening causes a big change in airflow (e.g. a few degrees opening could easily double or triple the airflow and fuel demand). The ECU has to be able to accurately detect a very small change in the throttle angle to be able to deliver the correct amount of fuel, so it should be obvious that even a tiny error in the TPS calibration can really mess things up at low RPM. This is what causes the jerkiness and why setting up the TPS properly fixes it. |
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