Innovate-motorsports OT-2 SDK Instrukcja Użytkownika Pobierz pdf (Strona 16)

000 Lambda valid, lambda value contains lambda reading in .001 lambda increments

Offset by .5 lambda (0x000 = .5 lambda, 0x3FF = 1.523 lambda)

001 Lambda value contains O2 level in 1/10%

010 Free air calibration in progress, Lambda data not valid

011 Need Free air Calibration Request, Lambda data not valid

100 Warming up, Lambda value is temp in 1/10% of operating temp.

101 Heater Calibration, Lambda value contains calibration countdown.

110 Error code in Lambda value

111 reserved

If you don’t want to parse all possible states, you can simply go on 000 means valid data,

not 000 means invalid data. Last we have the information needed to approximate AFR

from the actual lambda reading:

Word

Bit

L12

L11

L10

This is the ‘Air Fuel Multiplier’, scaled by 10. In other words, 147 really represents 14.7.

You would multiply this number by the lambda measurement to get approximate AFR for

the fuel currently specified.

Although you probably have figured all this out, we get asked how to calculate the proper

values from this packet a lot, so, at the risk of repeating, the basic measurements are:

Assemble “L”

Assemble “AF”

Assemble “F”

if (F == 0) // Valid

{

float lambda = (L * 0.001) + 0.500;

float afr = lambda * AF / 10;

}

‘Old’ (LM-1) Lambda/AFR Channels

The old lambda channel (sent only by the LM-1) is the most complicated, and also the

most troublesome for parsing. Although all the sample applications properly parse this

packet, frankly, if you are writing your own parser you might do well to simply ignore it,

unless you know that you will have to deal with connected LM-1’s.

Word

Bit

LM1

L12

L11

L10

bv9

bv8

bv7

bv6

Bv5

bv4

bv2

bv1

bv0

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 75 76

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