EFIDynoTuning Forum

efloth

My brain hurts. I tried setting TM_CS_ENG to TMCSE3 and it's back to disengaging entirely on decel. Not sure if I'm up against the physical limitation of the transmission or my code is hosed. Either way mission accomplished so thanks for all the help.

efloth

I will double check. Here is the logic in KID2 with named addresses. I am trying to determine if the coast clutch is disengaged in this case.

Code: Select all

CCC_CST_CLTCH_CTL_COM1:
9308: b1,08,33            ldb   R33,8            R33 = 8;
# TM_CS_DLY TIMER CONTROL
930b: 31,de,13            jnb   B1,Rde,9321      if (FLG_FRST_CM = 1)  {           # (shift commanded) 
930e: 9b,e8,cf,33         cmpb  R33,[Re8+cf]     
9312: d7,0d               jne   9321             if (R33 = GR_OLD)  {
9314: 99,06,d9            cmpb  Rd9,6            
9317: d7,08               jne   9321             if (GR_CM = 6)  {
9319: b3,e2,d5,38         ldb   R38,[Re2+d5]     R38 = TMCSOD;
931d: c7,e8,fa,38         stb   R38,[Re8+fa]     TM_CS_DLY = R38; } } }            # TM_CS_DLY = TMCSOD
                                                                                   # (delay coast clutch engagement
                                                                                   # in third gear to prevent two
                                                                                   # elements being on at once)
9321: 99,06,db            cmpb  Rdb,6            
# TM_CS_ENG TIMER CONTROL
9324: d7,13               jne   9339             if (PDL = 6)  {                   # (PRNDL = 3)
9326: 37,a2,10            jnb   B7,Ra2,9339      if (B7_FLG_CS_CM_a2 = 1)  {       # (coast clutch commanded on)
9329: 3d,a2,0d            jb    B5,Ra2,9339      if (B5_FLG_CS_FRST_a2 = 0)  {     # (1st pass thru)
932c: b3,e2,d4,38         ldb   R38,[Re2+d4]     R38 = TMCSE3;
9330: c7,e8,fb,38         stb   R38,[Re8+fb]     TM_CS_ENG = R38;                  # (coast clutch will be engaged when timer expires)
9334: 91,20,a2            orb   Ra2,20           B5_FLG_CS_FRST_a2 = 1;            # (set first pass flag)
9337: 20,1e               sjmp  9357             goto 9357; } } }

9339: 99,04,db            cmpb  Rdb,4            
933c: df,05               je    9343             if (PDL != 4)  {
933e: 99,02,db            cmpb  Rdb,2            
9341: d7,14               jne   9357             if (PDL != 2) goto 9357; }
9343: 9b,e8,d9,33         cmpb  R33,[Re8+d9]     
9347: d7,0e               jne   9357             if (R33 = PDL_LST)  {             # (4-2 or 4-1)
9349: 3d,a2,0b            jb    B5,Ra2,9357      if (B5_FLG_CS_FRST_a2 = 0)  {     # (first pass thru)
934c: b3,e2,d3,38         ldb   R38,[Re2+d3]     R38 = TMCSE2;
9350: c7,e8,fb,38         stb   R38,[Re8+fb]     TM_CS_ENG = R38;                  # coast clutch will be engaged when timer expires)
9354: 91,20,a2            orb   Ra2,20           B5_FLG_CS_FRST_a2 = 1; } } }      # (set first pass flag)
9357: 9b,e8,d0,33         cmpb  R33,[Re8+d0]     

# COAST CLUTCH OUTPUT CONTROL
935b: d7,05               jne   9362             if (R33 = GR_DS_TV)  {
935d: 71,7f,a2            an2b  Ra2,7f           B7_FLG_CS_CM_a2 = 0;              # (verifing a 3-4 upshift, de-energize Coast clutch)
9360: 20,27               sjmp  9389             goto 9389; }

9362: 9b,fd,e8,00,00      cmpb  R0,[Rfc+e8]      
9367: d7,08               jne   9371             if (CS_PDL_4 = 0)  {
9369: 99,06,db            cmpb  Rdb,6            
936c: d1,03               jleu  9371             if (PDL > 6)  {
936e: 36,a6,15            jnb   B6,Ra6,9386      if (B6_VSFMFLG_a6 = 0) goto 9386; } }
9371: 9b,e8,fa,00         cmpb  R0,[Re8+fa]      
9375: d7,0a               jne   9381             if (TM_CS_DLY = 0)  {
9377: 98,d9,33            cmpb  R33,Rd9          
937a: df,05               je    9381             if (R33 != GR_CM)  {              # GR_CM <> 4
937c: 91,80,a2            orb   Ra2,80           B7_FLG_CS_CM_a2 = 1;              # (energize coast clutch output)
937f: 20,03               sjmp  9384             goto 9384; } }

9381: 71,7f,a2            an2b  Ra2,7f           B7_FLG_CS_CM_a2 = 0;              # (de-energize coast clutch output. 
                                                                                   # Coast clutch is off hydraulically
                                                                                   # in 4th. Coast clutch is on       
                                                                                   # hydraulically when PDL = 2 or 1)
9384: 20,03               sjmp  9389             goto 9389; }

9386: 71,7f,a2            an2b  Ra2,7f           B7_FLG_CS_CM_a2 = 0;
9389: 91,01,a2            orb   Ra2,1            B0_Ra2 = 1;

INFER COAST CLUTCH ENGAGEMENT
938c: 3f,a2,07            jb    B7,Ra2,9396      if (B7_FLG_CS_CM_a2 = 0)  {
938f: 71,bf,a2            an2b  Ra2,bf           B6_FLG_CS_ENG_a2 = 0;             # (coast clutch is hydraulically off)
9392: 71,df,a2            an2b  Ra2,df           B5_FLG_CS_FRST_a2 = 0;
9395: f0                  ret                    return; }

9396: 9b,e8,fb,00         cmpb  R0,[Re8+fb]      
939a: d7,09               jne   93a5             if (TM_CS_ENG = 0)  {             # (timer expired)
939c: 9b,e8,fa,00         cmpb  R0,[Re8+fa]      
93a0: d7,03               jne   93a5             if (TM_CS_DLY = 0)  {
93a2: 3e,df,09            jb    B6,Rdf,93ae      if (B6_FLG_PWR_df = 1) goto 93ae; } }  # (power on)
93a5: 3c,df,09            jb    B4,Rdf,93b1      if (B4_FLG_SFT_MDN_df = 1) return;
93a8: 3e,df,06            jb    B6,Rdf,93b1      if (B6_FLG_PWR_df = 1) return;
93ab: 3f,4a,03            jb    B7,R4a,93b1      if (B7_FLG_DEL_MDN_4a = 1) return; }
93ae: 91,40,a2            orb   Ra2,40           B6_FLG_CS_ENG_a2 = 1; } } }
93b1: f0                  ret                    return;

efloth

Nice! It works and is much cleaner code. It still freewheels on decel. It would be nice to have engine braking, but I can always put it in manual low if that is not possible. I believe b7_Ra2 this is the coast clutch bit but based on the clutch application chart it should already be applied.

Code: Select all

91,80,a2            orb   Ra2,80           B7_Ra2 = 1;

Another final step is creating tcc lock/unlock points based on vss.

efloth

You nailed it. Not sure why it's not always unlocking for the 2-3 or 3-4 shift

Making progress on my hold 1st gear patch. I simply set the delay shift timer back to its initial value each pass. This works beautifully but on decel she freewheels and then acts like she's in neutral. I have to shift in to 2 and back to drive to get power from the engine again. Looks like I need to activate the coast clutch in software. Does that make sense? Ok to just turn it on like it does in third or vss fails?

COAST CLUTCH CONTROL
OVERVIEW
The coast clutch is a clutch used to provide engine braking in 3rd gear when
the PRNDL is in the drive position. Without the coast clutch the
transmission would free-wheel in third gear while the vehicle was coasting.
* In overdrive, the coast clutch is hydraulically off. Engine braking is
provided by the overdrive clutch in fourth gear.
* In drive, the software turns on the coast clutch to provide engine
braking. A short delay is provided to allow the overdrive clutch to
release fully.
* In manual 2 or 1 the coast clutch is applied hydraulically. Intermediate
band application is delayed until the coast clutch actually engages as
inferred by the shift in progress timer. This is to prevent the
intermediate band from absorbing excessive driveline deceleration energy
which could be better handled by the larger coast clutch.
* If the vehicle speed sensor has failed, the coast clutch is applied in
all gears below fourth to provide engine braking and prevent rapid
free-wheeling downshifts to first gear when the throttle is closed.

efloth

Still shifting hard into 3rd and 4th. Should I just pull another 30% from fn1420?
Also, did you disable MPG mode for any specific reason?

efloth

Yeah, I have a tendency to do that. Not sure why I didn't think to use FN1420. Clutch bro! I'll try this out later on today and get a real WOT pull.

efloth

It looks like setting negative values for EPC was actually raising pressure. I set them back to 0 and things softened up quite a bit. I shifted Fn620 down a few cells and it softened up 1st and 2nd but did not affect 3rd or 4th. I'm guessing that 0 EPC means 0 current to the solenoid so fn620 would have no effect at that point. Is negative EPC possible or will the rest have to be tuned hydraulically?

efloth

FN620(TV_PRES) - EPC VFS transfer function is at 0xb99a but not sure if it is a good idea to modify.

fn622 and 622a do not appear to be implemented in A1c AFAIK

efloth

I'll work on locating these:

TVPMIN = Global minimum TV_PRES clip, psi.
- TVPMN1 = Minimum EPC clip, PDL = 1, GEAR = 1, psi.
- TVPMN2 = Minimum EPC clip, PDL = 1, GEAR = 2, psi.
- TVPMN3 = Minimum EPC clip, PDL = 1, GEAR = 3, psi.
- TVPMX1 = Maximum EPC clip, PDL = 1, GEAR = 1, psi.
- TVPMX2 = Maximum EPC clip, PDL = 1, GEAR = 2, psi.
- TVPMX3 = Maximum EPC clip, PDL = 1, GEAR = 3, psi.
- VSSTAL = Maximum vehicle speed to do stall EPC.

We are obviously running into some minimum clip. I tried going further negative on EPC for 3rd and 4th but it made no difference. Since the latest update, it is shifting hard in third and fourth all the time

efloth

I hope this is good. First time I've burned out lol. has cold start at 36 degrees. Had to crank it 3 times.

IIRC the tprel/epc functions can be ignored in certain circumstances. Sometimes it shifts beautifully and others it is slamming into 3rd and 4th still. I wonder if we could force it to use the tprel/epc funtions all the time.

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