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03-17-2007, 02:30 PM | #1 | |||
Scooby Newbie
Member#: 882
Join Date: Feb 2000
Location: Michigan
Vehicle:2004 WRX Wagon very blue |
Closed loop target AFR versus Low det/hi det fuel surfs
Ziggyrama and I were having some discussions regarding the Hi det/low det fuel surfaces versus the CL target AFR over here so I decided to start a new thread rather than pollute Buck's STX map discussion.
To review: Quote:
Quote:
Quote:
That's all pretty clear when CL target is 14.7 and you go WOT, go open loop, and use the surface value of say 11.0 AFR. Gets a bit more tricky when your CL target is 15.0 and the surface still has 14.7's at part throttle.
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Last edited by TMessick; 03-17-2007 at 03:41 PM. |
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03-17-2007, 02:31 PM | #2 | |
Scooby Newbie
Member#: 882
Join Date: Feb 2000
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Quote:
I was also concerned that the rear O2 trim would "learn out" the leaner AFR, but I haven't seem my AFR #3 learning move at all. I also haven't been staring at my logs too much lately. |
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03-17-2007, 02:47 PM | #3 |
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OK looked at my 75mph cruise logs and found something interesting. Sensor and front O2 correction is showing 14.7 AFR even though I should be targeting 15.0. Then I looked back at my stock logs and the stock ECU is showing 14.4 AFR for the same condition. So I'm getting the 0.3 AFR offset I have cal'd in, but it looks liek something else may be offsetting the target AFR.
I vaguely remember seeing an XML file for WRX (or STi?) that defined a speed/load offset to target AFR. On the OEM stuff I work on, we typically do something like this for emissions. Basically, you target a slightly richer AFR at higher speeds/loads to keep down NOx emissions, at lower speeds/loads where combustion temps are low enough you can target a more "normal" stoich AFR of 14.7 Not sure if this is definitely what's happening, but it's as good of a rationalization as any. I also have a log from in-town driving at 40mph which shows the 15.0 AFR being used. Here ya go: |
03-17-2007, 02:50 PM | #4 |
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Join Date: Feb 2000
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Code:
Time RPM MAP AFR AF_Corr AF_lrn AF_Cor3 Thr MAF Ign MPH 286.031 2145 3.482 24 0 0 -0.78 0 4.31 12 43 286.301 2118 3.337 24 0 0 -0.78 0 4.34 12 42 286.572 2090 3.482 24.12 0 0 -0.78 0 4.39 12 42 286.842 2042 3.337 24 0 0 -0.78 0 4.28 12 42 287.112 2004 3.482 23.89 0 0 -0.78 0 4.28 12 40 287.383 1971 3.482 24 0 0 -0.78 0 4.25 12 40 287.653 1963 3.482 24 0 0 -0.78 0 4.23 12 40 287.924 1791 3.482 23.77 0 0 -0.78 0 4.12 12 40 288.204 1449 3.337 23.77 0 0 -0.78 0 3.58 20 39 288.474 1223 3.918 23.89 0 0 -0.78 0 3.75 20 38 288.745 1405 3.627 22.85 0 0 -0.78 0 3.41 12 38 289.015 1424 3.482 16.77 0 0 -0.78 0 3.38 12 37 289.286 1433 3.482 17.57 0 0 -0.78 0 3.38 12 37 289.556 1422 3.482 17.69 0 0 -0.78 1.57 3.43 12 37 289.826 1433 5.369 17.23 0 0 -0.78 6.27 8.89 30 37 290.097 1414 8.706 15.27 0.78 1.56 -0.78 10.2 17.73 27 37 290.367 1404 12.624 14.47 -0.78 1.56 -0.78 16.08 22.13 26 36 290.638 1431 13.929 14.59 2.34 1.56 -0.78 20.78 21.97 26 36 290.908 1441 14.22 14.59 1.56 1.56 -0.78 20.78 22.06 26 36 291.178 1439 14.365 14.36 3.13 1.56 -0.78 20.78 22.41 26 36 291.449 1462 14.655 14.36 5.47 1.56 -0.78 20.78 23.25 26 36 291.719 1478 14.8 14.13 6.25 1.56 -0.78 20.78 22.43 27 36 291.989 1480 14.8 14.01 5.47 1.56 -0.78 18.43 23.06 27 37 292.26 1505 14.655 14.01 6.25 1.56 -0.78 18.04 23.74 27 37 292.53 1505 14.8 14.13 6.25 1.56 -0.78 18.04 23.93 27 37 292.801 1522 14.8 13.9 5.47 1.56 -0.78 18.04 24.32 27 38 293.081 1528 14.8 14.01 5.47 1.56 -0.78 18.04 24.12 27 38 293.351 1548 14.945 14.24 6.25 1.56 -0.78 18.04 24.42 28 39 293.622 1561 14.945 13.9 6.25 1.56 -0.78 18.04 25.69 28 39 293.892 1588 14.945 14.13 5.47 1.56 -0.78 18.04 25.49 28 39 294.163 1597 14.655 13.9 4.69 1.56 -0.78 13.33 24.32 29 40 294.433 1588 11.898 13.21 1.56 1.56 -0.78 9.41 17.64 29 40 294.703 1602 10.882 14.36 -0.78 1.56 -0.78 8.63 16.09 30 40 294.974 1604 10.157 14.59 -0.78 1.56 -0.78 8.24 16.09 30 40 295.244 1624 9.431 14.93 -1.56 1.56 -0.78 7.06 13.62 31 41 295.515 1623 8.706 14.93 0 1.56 -0.78 7.06 13.67 31 41 295.785 1624 8.416 14.81 -1.56 1.56 -0.78 6.27 13.2 33 41 296.055 1628 7.545 14.47 -3.91 1.56 -0.78 5.49 11.28 33 41 296.326 1627 6.965 14.7 -4.69 1.56 -0.78 5.1 10.27 33 41 296.596 1629 6.529 14.7 -6.25 1.56 -0.78 4.31 9.89 33 41 296.866 1624 5.369 14.7 -7.03 0 -0.78 1.96 6.1 31 41 297.137 1614 4.353 14.59 -9.38 0 -0.78 0.78 4.81 19 41 297.407 1597 3.627 14.59 -9.38 0 -0.78 0 4.04 15 41 297.678 1618 3.047 15.16 0 0 -0.78 0 3.43 12 41 297.948 1600 3.192 23.2 0 0 -0.78 0 3.43 12 41 298.218 1585 3.337 23.43 0 0 -0.78 0.39 3.73 12 41 298.489 1574 3.482 23.54 0 0 -0.78 0.39 4.17 12 41 298.759 1553 3.627 23.89 0 0 -0.78 0.39 4.23 12 41 299.03 1555 3.627 23.77 0 0 -0.78 2.35 4.23 12 40 299.3 1530 4.933 23.77 0 0 -0.78 3.92 7.97 3 40 299.57 1556 6.82 18.03 0 0 -0.78 7.45 12.96 12 40 299.841 1522 8.851 14.7 0 1.56 -0.78 9.02 15.73 21 39 300.111 1544 9.867 14.59 3.13 1.56 -0.78 9.02 16.35 29 39 300.382 1547 10.157 14.47 5.47 1.56 -0.78 9.41 16.48 29 40 300.652 1548 10.447 14.24 5.47 1.56 -0.78 9.41 16.7 29 40 300.922 1559 10.302 14.01 4.69 1.56 -0.78 9.41 16.35 30 40 301.193 1562 9.286 14.01 5.47 1.56 -0.78 6.27 12.48 30 40 301.463 1558 8.271 14.13 4.69 1.56 -0.78 6.27 12.19 32 40 301.733 1559 7.98 14.13 6.25 1.56 -0.78 6.27 11.96 32 39 302.004 1561 7.69 14.13 6.25 1.56 -0.78 5.49 11.38 32 39 302.274 1573 7.4 14.01 5.47 1.56 -0.78 5.49 11 33 40 302.545 1571 7.255 14.13 5.47 1.56 -0.78 5.49 10.71 32 40 302.815 1574 7.11 14.01 4.69 1.56 -0.78 5.49 10.66 32 40 303.085 1563 6.965 14.01 4.69 1.56 -0.78 5.49 10.74 32 40 303.356 1562 6.965 14.01 4.69 1.56 -0.78 4.71 10.74 33 40 303.626 1575 6.675 13.9 3.13 1.56 -0.78 4.71 9.96 32 40 303.897 1577 6.529 14.01 4.69 0 -0.78 4.71 9.72 32 40 304.177 1572 6.529 14.24 5.47 0 -0.78 4.71 9.81 32 40 304.447 1564 6.529 14.13 5.47 0 -0.78 4.71 9.91 32 40 304.718 1570 6.529 14.13 5.47 0 -0.78 4.71 9.86 32 40 304.988 1575 6.529 14.13 6.25 0 -0.78 4.71 9.82 32 40 305.269 1578 6.529 14.01 5.47 0 -0.78 4.71 9.77 32 40 305.539 1583 6.384 14.01 4.69 0 -0.78 4.71 9.68 32 40 305.809 1582 6.239 13.9 3.91 0 -0.78 4.31 9.13 32 40 306.08 1585 6.094 14.01 3.91 0 -0.78 4.31 9.14 32 40 306.35 1574 6.094 14.01 1.56 0 -0.78 4.31 9.17 32 40 306.631 1577 5.949 14.24 -2.34 0 -0.78 4.31 8.61 32 40 306.901 1586 5.804 14.59 -3.13 0 -0.78 3.92 8.43 31 40 307.171 1592 5.659 14.81 -3.91 0 -0.78 3.92 8.3 31 40 307.442 1588 5.659 14.93 -3.91 0 -0.78 3.92 8.34 31 40 307.722 1585 5.659 15.16 -2.34 0 -0.78 3.92 8.43 31 40 307.992 1590 5.514 15.04 -2.34 0 -0.78 3.92 7.87 31 40 308.263 1579 5.514 15.39 0.78 0 -0.78 3.53 8.08 31 40 308.543 1576 5.514 14.93 0 0 -0.78 3.53 8.13 31 40 308.814 1577 5.514 14.7 -1.56 0.78 -0.78 3.53 7.8 31 41 309.084 1576 5.369 14.93 -1.56 0.78 -0.78 3.53 8.08 31 41 309.354 1578 5.369 15.04 -1.56 0.78 -0.78 3.53 8.08 31 40 309.625 1588 5.369 14.81 -2.34 0.78 -0.78 3.53 7.75 31 40 309.895 1586 5.224 14.93 -3.13 0.78 -0.78 3.53 7.75 31 40 310.176 1573 5.224 15.04 -2.34 0.78 -0.78 3.53 7.62 31 40 310.446 1588 5.224 14.93 -3.13 0.78 -0.78 3.53 7.7 31 40 310.716 1580 5.224 14.93 -2.34 0.78 -0.78 3.53 7.61 31 40 310.987 1578 5.224 15.04 -2.34 0.78 -0.78 3.53 7.61 31 40 311.257 1579 5.224 15.04 -2.34 0.78 -0.78 3.53 7.62 31 40 311.528 1573 5.224 14.81 -3.13 0.78 -0.78 3.53 7.53 31 40 311.798 1591 5.224 15.04 -2.34 0.78 -0.78 3.53 7.66 31 40 312.068 1593 5.224 15.04 -1.56 0.78 -0.78 3.53 7.61 31 40 312.339 1571 5.224 14.81 -2.34 0.78 -0.78 3.53 7.65 31 40 312.619 1578 5.224 15.04 -1.56 0.78 -0.78 3.53 7.7 31 40 312.89 1570 5.224 15.04 -1.56 0.78 -0.78 3.53 7.61 31 40 313.16 1571 5.224 14.93 -1.56 0.78 -0.78 3.53 7.74 31 40 313.43 1580 5.224 14.93 -2.34 0.78 -0.78 3.53 7.48 31 40 313.701 1581 5.224 15.16 -0.78 0.78 -0.78 3.53 7.53 31 40 313.971 1580 5.369 14.93 -1.56 0.78 -0.78 3.53 7.7 31 40 314.241 1573 5.224 14.81 -2.34 0.78 -0.78 3.53 7.74 31 40 314.512 1566 5.369 14.81 -3.13 0.78 -0.78 3.53 7.74 31 40 314.782 1552 5.369 15.04 -2.34 0.78 -0.78 3.53 7.95 31 40 315.063 1568 5.514 15.16 -1.56 0.78 -0.78 3.53 8.29 31 40 315.333 1568 5.659 15.04 -1.56 0.78 -0.78 3.53 8.33 31 40 315.603 1562 5.659 14.93 -1.56 0.78 -0.78 3.92 8.55 31 40 315.874 1549 6.094 15.04 -0.78 0.78 -0.78 4.31 9.18 31 40 316.144 1557 6.239 15.04 -0.78 0.78 -0.78 4.71 9.54 32 40 316.415 1562 6.529 15.16 0 1.56 -0.78 4.71 10.05 32 40 316.685 1559 6.82 14.7 -2.34 1.56 -0.78 5.1 10.73 32 40 316.955 1548 7.11 14.7 -3.13 1.56 -0.78 5.49 10.86 32 40 317.226 1543 7.4 14.93 -3.13 2.34 -0.78 5.88 11.62 32 40 317.506 1553 7.69 14.93 -3.13 2.34 -0.78 6.27 12.7 32 40 317.777 1538 8.125 15.04 -2.34 2.34 -0.78 6.27 12.69 32 40 318.047 1547 8.416 14.81 -3.13 2.34 -0.78 7.06 13.44 30 40 318.317 1544 8.996 15.39 -0.78 2.34 -0.78 7.45 14.77 30 39 318.588 1547 9.286 14.81 -3.13 2.34 -0.78 8.24 14.52 30 39 318.858 1535 9.722 15.39 0 2.34 -0.78 8.63 15.34 29 39 319.129 1546 10.012 14.93 -0.78 2.34 -0.78 8.63 15.88 29 39 319.399 1556 10.157 14.93 -0.78 2.34 -0.78 8.63 15.61 29 39 319.669 1533 10.157 15.04 0.78 2.34 -0.78 8.63 16.36 29 39 319.95 1546 10.302 14.81 -0.78 2.34 -0.78 8.63 15.88 29 39 320.22 1544 10.447 15.04 0 2.34 -0.78 9.41 16.83 29 39 320.49 1527 10.737 14.81 -0.78 2.34 -0.78 9.8 17.56 29 40 320.761 1542 11.027 14.93 0 2.34 -0.78 9.8 17.69 29 40 321.031 1548 11.173 14.81 -0.78 2.34 -0.78 10.2 18.05 27 40 321.302 1553 11.318 15.04 0 2.34 -0.78 10.2 18.04 26 40 321.572 1541 11.463 14.93 0 2.34 -0.78 10.59 18.56 26 40 321.842 1551 11.608 14.93 -0.78 2.34 -0.78 10.59 19.01 27 40 322.113 1543 11.753 14.93 0 2.34 -0.78 10.59 18.77 26 39 322.393 1531 11.753 15.04 -0.78 2.34 -0.78 10.98 19 26 39 322.664 1544 12.043 14.93 0 2.34 -0.78 11.76 19.6 27 39 322.934 1564 12.188 15.04 0 2.34 -0.78 11.76 19.73 28 39 323.204 1562 11.898 14.93 0 2.34 -0.78 10.59 18.68 28 39 323.475 1556 11.463 14.7 -0.78 2.34 -0.78 10.2 18.41 28 39 323.745 1567 11.173 14.81 -1.56 2.34 -0.78 10.2 17.89 28 39 324.016 1561 10.882 14.7 -2.34 2.34 -0.78 9.41 17.07 29 40 324.286 1588 10.737 15.04 -2.34 3.13 -0.78 9.41 17.22 29 40 324.556 1587 10.737 14.93 -1.56 3.13 -0.78 9.41 17.36 29 40 324.827 1586 10.737 14.93 -1.56 3.13 -0.78 9.41 17.23 29 40 325.097 1585 10.592 14.93 -1.56 3.13 -0.78 9.41 16.96 30 40 325.367 1582 10.447 14.81 -1.56 3.13 -0.78 9.41 17.03 30 40 325.638 1587 10.302 15.04 -1.56 3.13 -0.78 8.63 16.21 30 40 325.908 1586 10.157 15.04 -0.78 3.13 -0.78 8.63 16.22 30 40 326.179 1589 10.157 14.93 -1.56 3.13 -0.78 8.63 16.09 30 40 326.449 1583 10.012 14.93 0 3.13 -0.78 8.63 15.42 30 40 326.719 1591 9.722 14.93 -0.78 3.13 -0.78 8.24 15.71 31 40 326.99 1598 9.722 14.7 -1.56 3.13 -0.78 8.24 15.65 31 40 327.26 1599 9.576 14.7 -2.34 3.13 -0.78 8.24 14.37 31 41 327.531 1596 9.576 14.93 -1.56 3.13 -0.78 8.24 15.47 31 41 327.801 1598 9.431 14.81 -2.34 3.13 -0.78 7.45 14.86 30 41 328.071 1597 9.141 14.7 -3.91 3.13 -0.78 7.45 14.58 31 40 328.342 1587 9.141 14.93 -2.34 3.13 -0.78 7.45 14.46 31 40 328.612 1591 9.141 14.93 -2.34 3.13 -0.78 7.45 14.57 31 40 328.883 1582 8.996 14.93 -1.56 3.13 -0.78 7.45 14.17 31 40 329.153 1587 8.851 14.93 -1.56 3.13 -0.78 7.45 13.99 31 40 329.423 1586 8.851 14.93 -0.78 3.13 -0.78 7.45 14.11 31 40 329.694 1599 8.851 14.81 -1.56 3.13 -0.78 7.45 13.93 31 40 329.964 1598 8.851 15.04 -0.78 3.13 -0.78 7.45 13.76 31 40 330.234 1597 8.706 14.81 -0.78 3.13 -0.78 7.06 13.59 31 40 330.505 1600 8.706 15.04 -1.56 3.13 -0.78 7.06 13.71 31 40 330.775 1606 8.416 14.59 -2.34 3.13 -0.78 6.67 13.06 31 40 331.046 1609 7.98 14.7 -3.91 3.13 -0.78 6.27 12.14 33 41 331.316 1607 7.835 14.81 -3.91 3.13 -0.78 6.27 12.16 33 41 331.586 1613 7.69 15.04 -3.91 3.13 -0.78 5.88 11.95 33 41 331.857 1614 7.255 14.81 -4.69 3.13 -0.78 5.1 10.45 33 41 332.127 1616 6.675 14.7 -5.47 3.13 -0.78 4.71 10.28 33 41 332.398 1614 6.384 14.93 -4.69 2.34 -0.78 4.71 9.4 33 41 332.668 1612 6.094 14.81 -4.69 0.78 -0.78 4.31 8.61 32 41 332.938 1619 5.804 15.27 -2.34 0.78 -0.78 3.92 8.52 32 41 333.209 1621 5.514 14.81 -3.13 0.78 -0.78 3.14 7.83 31 41 333.479 1619 5.078 14.7 -3.91 0.78 -0.78 2.75 6.91 31 41 333.76 1623 4.933 14.7 -5.47 0.78 -0.78 2.75 6.99 31 41 334.04 1626 4.643 14.81 -5.47 0.78 -0.78 2.35 6.34 30 41 334.32 1618 4.498 14.81 -6.25 0 -0.78 1.96 5.9 30 41 334.591 1614 4.353 14.93 -5.47 0 -0.78 2.35 5.93 30 41 334.851 1615 4.208 15.16 -4.69 0 -0.78 1.96 5.69 30 41 335.122 1616 4.208 14.93 -4.69 0 -0.78 1.96 5.63 30 41 335.392 1614 4.063 14.93 -4.69 0 -0.78 1.96 5.63 30 41 335.662 1606 4.063 15.16 -3.13 0 -0.78 1.96 5.53 30 41 335.933 1611 4.063 15.16 -2.34 -0.78 -0.78 1.96 5.43 30 41 336.203 1609 4.063 15.04 -1.56 -0.78 -0.78 1.96 5.43 30 41 336.473 1600 4.063 14.81 -2.34 -0.78 -0.78 1.57 5.34 30 41 336.744 1608 3.918 14.81 -3.13 -0.78 -0.78 1.96 5.34 30 41 337.024 1595 4.063 15.04 -1.56 -0.78 -0.78 1.57 5.43 30 40 337.295 1577 4.063 14.93 -1.56 -0.78 -0.78 1.57 5.34 30 40 337.565 1585 4.063 14.81 -2.34 -0.78 -0.78 1.57 5.4 30 40 337.835 1580 4.063 14.93 -2.34 -0.78 -0.78 1.57 5.47 29 40 338.106 1578 4.063 15.04 -1.56 -0.78 -0.78 1.57 5.4 30 40 338.376 1588 4.063 14.81 -2.34 -0.78 -0.78 1.57 5.4 30 41 338.647 1588 4.208 14.93 -2.34 -0.78 -0.78 1.96 5.63 30 41 338.917 1584 4.208 15.16 -0.78 -0.78 -0.78 1.96 5.53 30 40 339.187 1582 4.208 14.93 -1.56 -0.78 -0.78 1.96 5.53 29 40 339.468 1569 4.208 14.93 -1.56 0 -0.78 1.96 5.73 29 40 339.738 1581 4.208 15.16 0 0 -0.78 1.96 5.8 30 40 340.009 1561 4.353 14.93 -0.78 0 -0.78 1.96 5.86 29 40 340.279 1576 4.353 14.81 -1.56 0 -0.78 1.96 5.76 29 40 340.549 1575 4.353 14.93 -1.56 0 -0.78 1.96 5.8 29 40 340.82 1583 4.353 15.04 -0.78 0 -0.78 2.35 5.93 29 40 341.09 1574 4.498 15.04 0 0 -0.78 2.75 6.26 30 40 341.36 1565 4.643 14.93 -0.78 0 -0.78 2.75 6.56 30 40 341.631 1563 4.788 14.81 -1.56 0 -0.78 2.75 6.51 30 40 341.901 1573 4.788 14.7 -3.13 0.78 -0.78 2.75 6.53 30 40 |
03-17-2007, 06:39 PM | #5 | |
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Quote:
I am curious to see if this CL target AFR compensation table does exist on 16bit and 32bit ECUs. This may explain a lot of things. Do you think this table was exclusive to 32bit ECUs? Also, I'd like to add that I find it very odd that the ECU can target higher than 14.7:1 AFR during CL but will not consider anything higher than that when in OL. Very strange. Last edited by Ziggyrama; 03-17-2007 at 06:56 PM. |
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03-17-2007, 11:42 PM | #6 |
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OK, found it in the XML Write ECU_DEFS file generated for my 2004. Called "Load/RPM Target Lambda Bias Manual" Load as X, RPM as Y and lambda bias offset as Z. Haven't messed with it, so I can't verify what it does but it at least boxes with my assumptions. I'm thinking zeroing this would be a good idea... Not sure if it's there for the 32 bit, etc. but I'd venture to say that it probably is. Generating a new ECU_DEFS file from XML Write is a bit of a pain and I'm not motivated enough to look for it in a bunch of other maps. Heck, I'm still using the 510F map for my '04 because XML Write won't spit out the full listing for the 520F cal.
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03-17-2007, 11:57 PM | #7 |
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OK, now I see what you mean. I hadn't tried to edit the OL surfaces leaner than 14.7 before. Looks like that's impossible since 00 hex is equal to 14.7 AFR. I suspect that this may be an artifact of how enginuity, etc. display the surface. More than likely, this is intended as a lambda offset when open loop. 0X00 = 0 offset and 0xFF = 0.666 lamda offset. The only question then is, offset to what? The raw target CL AFR cal? Maybe. Just hypothesizing based on some of the prod software I've seen.
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03-18-2007, 06:59 PM | #8 |
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+1 for the ECU targeting 14.7 at cruise even when I had the CL ratio up to 15.
At idle it would switch over to 15 after a bit. |
03-19-2007, 10:29 AM | #9 |
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tom, zero out that map.
many of the corrections to afr affect both open and closed loop operation, ie iat, ect, assorted maps such as the one you posted, etc. however, when changing the closed loop target i have not found open loop actual afrs to change. ken |
03-19-2007, 04:16 PM | #10 | |
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Quote:
So, here's an interesting twist to all of this. Since ECU thinks in lambda, I think there's a huge assumption made when we talk about AFRs and that is that lambda 1 is 14.7:1 AFR. I have doubts in my mind that that is actually the case. I have come across Denso's planar chart that graphs current output vs. AFR. Here's the link to it (2nd to last post on the page): http://www.enginuity.org/viewtopic.p...r=asc&start=15 That line intersects the 0 mA reading at 14.5 AFR, or so. I dug up the patent write up owned by Denso on the sensor: http://www.freepatentsonline.com/6055972.html Towards the bottom of the page, here's the relevant piece that I think is very interesting: "The air-fuel ratio sensor 26 in this embodiment is so constructed to cause the limit current Ip to zero (Ip=0) at the stoichiometric air-fuel ratio A/F of 14.5 (.lambda.=1), so that control of the air-fuel ratio A/F with the zero limit current Ip (Ip=0) taken as a reference can be carried out with ease." I got curious since my WBO2 does read 14.5 when I am crusing at reported 14.7 front O2 reading according to Enginuity logger. I logged lambda and front sensor current and 0 mA does correspond to lambda 1. So, this side checks out and I believe it has been established in the past. Where I am uncertain of things is the 14.7 multiplier. I mean, that is what most general papers quote as stoich for regular gas but who knows what Subaru thought was appropriate. |
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03-19-2007, 04:42 PM | #11 | |
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Quote:
I looked briefly and looks like the main location of the table is the same between 500F and 520F. I need to verify it more to make sure. |
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03-19-2007, 10:21 PM | #12 |
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OK, I looked at 520F with hex editor and the map looks like it has the same locations as 510F. The values look to be the same as well. I think I might just zero out the table and see if there's a change.
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03-20-2007, 06:12 AM | #13 |
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and you will also post the code to add to the definition file...
right? |
03-20-2007, 01:27 PM | #14 | |
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The definition for the map for 04 WRX ROM 520F is: Generic definition for the base part: <table type="3D" name="Fuel compensation RPM/Load" category="Experimental" endian="big" sizex="8" sizey="7" storagetype="uint8"> <scaling units="AFR" expression="x/557.278911564625901+(-0.2265625)" to_byte="(x-(-0.2265625))*557.278911564625901" format="#.00" fineincrement="0.1" coarseincrement="1"/> <table type="X Axis" name="Load" endian="big" storagetype="uint16" sizex="8"> <scaling units="g" expression="x/8192" to_byte="x*8192" format="#.00" fineincrement="0.1" coarseincrement="1"/> </table> <table type="Y Axis" name="RPM" endian="big" storagetype="uint16" sizey="7"> <scaling units="RPM" expression="x/5.12" to_byte="x*5.12" format="#" fineincrement="100" coarseincrement="1000"/> </table> </table> 520F specific definition: <table name="Fuel compensation RPM/Load" storageaddress="0x28C14"> <table type="X Axis" storageaddress="0x28C02"/> <table type="Y Axis" storageaddress="0x28BF3"/> </table> |
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04-10-2007, 10:28 AM | #15 |
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Is there a table like this in the 16 bit ECU's?
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04-10-2007, 12:08 PM | #16 |
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That is the 16 bit ECU pictured above.
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04-11-2007, 11:12 AM | #17 |
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Where can I go to find the correct addresses for my 2002 (A4SGE01C) 16 bit ROM? If the tables are the same size, I assume that I just need to change the storageaddress pointers.
EDIT: I've tried HEX editors and I can't seem to figure out the exact settings I need to see anything useful. Is there a specific editor that works better than others? |
12-27-2007, 12:18 AM | #18 |
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Enginuity doesn't display the above table for my 02 ROM, or I don't know how to make it do so, but I have noticed that if I target an AFR of 15.0 or below, it likes to hunt and shoot for 14.7 almost all ofthe time. however, if I go to 15.1 or higher, it will hunt and hit whatever value I put in there. also, the AFR learning does not match(ie zero when it hits it's mark) but appears to still be be trying to hit 14.7. I am trying to run 15.1 AFR in CL, so I have totally given up on my STFT and LTFT because if I follow them, I have to change my injector scaling...and that just doesn't seem right. there must be something else I am missing. If I give up totally and just go back to 14.7 AFR, the car runs at 13.5 all the time and 14.7 when crusing.
FYI, for an 02 WRX ROM, I can't change the target AFR to be leaner than 14.7 in the OL map using enginuity, either on the fuel map itself or even the "minimum active primary OL enrichment" value(which I gather from the description of said value, is the leanest possible value on the OL table) however, I "might" be able to change the coolant temperature compensation values to encourage a positve % increase though. |
12-27-2007, 06:01 AM | #19 | |
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Quote:
have you downloaded the latest logger defs which include the open/closed loop status? maybe you're running in open loop a lot more than you think. |
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12-27-2007, 06:47 AM | #20 |
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The primary OL fuel map is actually an enrichment table whose underlyiing value is an offset that is applied to base CL fueling. Therefore, zero enrichment (the smallest allowable value in this table) is effectively a 14.7:1 AFR.
"Minimum Active Primary OL enrichment" is the minimum enrichment (leanest effective AFR) that is allowed. That is, if the primary fuel map calls for enrichment less than the raw value (effectively leaner AFR than this value), then it is not applied and you will stay in closed loop. |
12-27-2007, 06:19 PM | #21 | |
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Quote:
my "Minimum Active Primary OL enrichment" value was set to 14.4 , which is stock I believe. If what Tea cups says is true, then changing this to 14.7 may make the car run in OL more often. Maybe I will try it and see, but I don't think it will fix my target AFR error in closed loop. I have not been able to find any good info on changing target AFRs other than just changing the target and no issues with STFT and LTFT. My car seems to unwilling to want to change the target AFR and still keep legit fuel trims. even so, my fuel trims when driving around are all over the place anyway...even with a new sensor and no exhaust leaks that I can find. Last edited by Wheeler Bement; 12-27-2007 at 06:41 PM. |
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12-27-2007, 06:54 PM | #22 | |
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12-27-2007, 07:47 PM | #23 |
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