Then, we do a p? of order..
In practice, EDC15, unlike EDC16/17, we have the axes of the map just before the map.
Not all of them have axes, but for the most part, the ch? helps a lot to understand the maps.
The two-dimensional maps have two aces, then you'll find yourself a signature byte, which identifies the meaning of the axis, then c'? the size of the board, and then the actual values of the axis. The same thing is repeated for the second axis, and then begin the values of the map. Of course, the one-dimensional maps, such as torque limiters, have only a single axis and then begin the values.
Example of a hypothetical map fumes 3x2:
50222 00002 01000 02000 50996 00003 05000 08000 09000 01000 02350 04420 01200 02600 04800
In bold are the signature bytes, in my ori, all 50222 are engine rpm, 50130 ? the temperature of the liquid cooling system, etc.
Some ECUS have the software very similar, and the SB may also be the same, but usually they are different then you have to find the meaning of your SB.
Italic c'? the length of the axes, the underlined values are the values of the axes and the rest are the values of the map.
The map of the example would be cos?:
Codice:
airflow 500 800 900
-------------------------
rpm |
1000 | 10,0 23,5 44,2
2000 | 12,0 26,0 48,0
rpm ? used to denote the revs of the engine, really? it would be to write to the Engine Speed, measured in rev/min (revolutions per minute).
airflow ? the air flow measured in mg/impulse. In practice, the milligrams that come in a cylinder in a cycle of suction.
This map, being a map smoke ? a limiter, then the values in the map have the highest IQ.
IQ = Injected Quantity, measured in mm3/stroke. The factor if I'm not mistaken ? 0,01 therefore 01000 becomes 10mm3.
If you want to calculate the air-fuel ratio, you have to have the sessa unit? both the extent and for the air to the fuel.
Easily convert from volume to weight in the diesel fuel, being 1 mm3=0,835 mg.
Cos? you have both air and fuel in weight. My 2.0 HDi, the series goes on a ratio of 17:1.
Obviously it doesn't make sense to increase the values of this map, why? the machine fumerebbe giving so much oil with a little air.
The problem lies in the fact that my map as your see, the axis of the air flow, defined up to 900mg. Really? my, series, arrives to aspire 1000mg safely. By increasing the turbo pressure from 2000mbar to 2250mbar arrival to aspire 1300mg quietly and without too much strain on the turbo seen that ? made to go up to 2300mbar.
Quick calculation: with 1300mg, and a ratio of 17:1, I can inject up to 76mg, equivalent to 63mm3. But to achieve this, we need to "stretch" the axis of this map so that the ecu knows what to do after the 900mg. Why? cos? com'? now, above the 900mg the control unit takes the last known value, and then always behaves as if it had 900mg of air.
Since we can not do more? space, you have to delete a column that we feel useless, move the other to the left so that the last to remain free. Cos? we have the penultimate column that defines the 900mg of the series, and on the last free column, we can define, for example, 1000mg.
For stayed at the column you want to delete, usually the first are the same and are de type, 200mg, 300mg, etc..
Consider that even at 750rpm and do nothing, the engine sucks in at least 400mg, and then you can delete the first column, move everything to the left (map and axis), and define the last column.
I hope not to have confused the ideas, and maybe now you understand why? a map of the flue gas with an axis RPM and other engine Load 0 to 100%, has virtually nothing. You can only decrease the ratio of AFR and make you smoke more? the machine, or to increase only the last column and to smoke during acceleration strong..
If I was not clear about something-ask
Hello
Originally Written by giarras
Sorry Alex.T but in my map smokes the maximum value ? 9000 with regards to the mg of the air, and the iq is maximum 6430;
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