Code: EGR and CTS conversions

[EagleMark]

trying to calibrate using raw A/D counts is a horrible idea... you wouldn't be able to give it an equation or even convert it accurately at all since tunerpro doesn't support lookup tables in the XDF.

Wondering how the ASM comes up with the value? Seems to be there and everyone just shot for a conversion that came close?

LD299 FCB 48 ; 25c COOL Min for CLS LP Enable

[gregs78cam]

I have wonderd about this before. But, according to a hac that I just looked at, the coolant temp calc (if indeed linear) should be a range of 192*C that is proportional to 256 A/D counts. Which would be the "0.750000 * X -40.000000" equation. Any parameter that references Coolant temp in *C should also be converted as such.

[EagleMark]

I have wonderd about this before. But, according to a hac that I just looked at, the coolant temp calc (if indeed linear) should be a range of 192*C that is proportional to 256 A/D counts. Which would be the "0.750000 * X -40.000000" equation. Any parameter that references Coolant temp in *C should also be converted as such.

Hmmm... well I wonder? Since the A/D counts to Degrees C I have goes from
255 = -40
and
0 = 200

If that should not be 0.781250 * X -40.00000 ?

[gregs78cam]

all coolant tables I saw were from -40 to 152C = 192*C range

[EagleMark]

I guess it's splitting hairs at this point? But your the one who got me started on math, math is cool, it's everwhere! Yeah well how come it's not exact?

Found this in a $0D dis.asm

;>Coolant counts conversion table for raw A/D value
;
;	 A/D 	degrees		A/D
; 	counts     C		Inv
; 	------- -------		---
; 	255	    -40		  0
; 	251	    -30		  4
; 	250	    -25		  5
; 	247	    -20		  8
; 	245	    -15		 10
; 	241	    -10		 14
; 	237	    - 5		 18
; 	231	      0		 24
; 	225	      5		 30
; 	218	     10		 37
; 	209	     15		 46
; 	199	     20		 56
; 	189	     25		 66
; 	177	     30		 78
; 	165	     35		 90
; 	152	     40		103
; 	139	     45		116
; 	126	     50		129
; 	114	     55		141
; 	102	     60		153
; 	92	     65		163
; 	81	     70		174
; 	72	     75		183
; 	64	     80		191
; 	56	     85		199
; 	50	     90		205
; 	44	     95		211
; 	39	    100		216
; 	34	    105		221
; 	30	    110		225
; 	26	    115		229
; 	23	    120		232
; 	21	    125		234
; 	18	    130		237
; 	16	    135		239
; 	14	    140		241
; 	13	    145		242
; 	12	    150		243
; 	0	    200		255
;
;>Temp conversion for stored linear counts
; -Deg C = .746 x counts - 40

SO if it were needing inverse would it be 0.750000 * X +200.000000

[EagleMark]

And this in a ASDX1.asm

					; INV COOL BP'S
					;		17 lns	
					;		BIN		Deg c
					;		----------------
					;		0           -5 
					;		16 	5 
					;		32 	15 
					;		48 	25 
					;		64 	35 
					;		80 	45 
					;		96 	55 
					;		112 	65 
					;		128 	75 
					;		144 	85 
					;		160 	95 
					;		176 	100 
					;		192 	105 
					;		208 	110 
					;		224 	115 
					;		240 	200 
					;		256 	201