Help Identifying Unknown Map

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Topic: Help Identifying Unknown Map - KFSW (Read 4223 times)

tightmopedman9

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	Help Identifying Unknown Map - KFSW « on: February 13, 2014, 12:22:01 AM »

KFSW - Schließwinkel Kennfeld - 16 x 16
This is from a Bosch M4.4 system.

It is under the ignition category in the DAMOS. Y axis is battery voltage, X axis is RPM.

I assumed it was a dwell map, but now I'm not too sure.


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tightmopedman9

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	Re: Help Identifying Unknown Map - KFSW « Reply #1 on: February 13, 2014, 12:23:32 AM »

Forgot to add, cell values are degrees (rotational I believe)


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aef

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	Re: Help Identifying Unknown Map - KFSW « Reply #2 on: February 13, 2014, 12:46:26 AM »

cam dwell characteristic map

this is a bad translation from a german text:
On high revs you have a lower energy at the spark plug. to compensate this the cam dwell caracteristic map is used.
this map provides the ideal dwell angle at a given voltage and rpm to achieve the ideal ignition/firing voltage.

source:
https://www.uni-muenster.de/imperia/md/content/fachbereich_physik/technik_didaktik/steuerung_ottomotor.doc


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tightmopedman9

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	Re: Help Identifying Unknown Map - KFSW « Reply #3 on: February 13, 2014, 01:00:03 AM »

Awesome! Thanks, I guess I was looking for a simpler map, one that just had dwell time at a given RPM and load. However, the dwell by cam angle does make more sense.

Would I be right in thinking that increasing the cell value will increase the amount of dwell time?


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