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Gen2 Prius: Custom PIDs for Torque (Android App) with formulas

Discussion in 'Gen 2 Prius Technical Discussion' started by usbseawolf2000, Jun 24, 2011.

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  1. usbseawolf2000

    usbseawolf2000 HSD PhD

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    See below. That should sum it up.

    [​IMG]
    [​IMG]

    Source

    MG2 is the traction and regen motor. You can monitor MG2 torque to see how much electric propulsion and regen HSD is doing. Surprisingly, MG2 assists way less than I thought! The gas engine's torque is enough for most of my driving needs. MG2 RPM is pretty useless since it ties to the vehicle speed.

    MG1 starts the gas engine and also acts as a generator to supply electricity to either MG2 or charge the HV battery. MG1 torque is wrong at the moment but RPM seems right. MG1 can be monitored to see how much electricity is being generated from the gas engine.

    There are a bunch of PIDs but I don't have time to add them yet. I'll post later so you guys can test.

    BTW, do you get the correct unit? On mine, MG2 torque's unit is displaying "F". That's for the coolant temperature.
     
    #21 usbseawolf2000, Jul 19, 2011
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  2. usbseawolf2000

    usbseawolf2000 HSD PhD

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    This is what I am talking about. HV SOC's unit should be "%" and MG2Torq should be Nm.

    [​IMG]
     

    Attached Files:

    #22 usbseawolf2000, Jul 19, 2011
  3. usbseawolf2000

    usbseawolf2000 HSD PhD

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    I think these will be useful. I have not tested them. They are from HV ECU.

    HV Battery Charge
    PID: 21CF
    Min: 0
    Max: 50
    Unit: kW
    Equation: E-64
    Header: 7E3

    HV Battery Discharge
    PID: 21CF
    Min: 0
    Max: 50
    Unit: kW
    Equation: F-64
    Header: 7E3

    HV Battery Fan Mode
    PID: 21CF
    Min: 0
    Max: 10
    Unit: Num
    Equation: I
    Header: 7E3
     
    #23 usbseawolf2000, Jul 20, 2011
  4. usbseawolf2000

    usbseawolf2000 HSD PhD

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    I added a link to the spreadsheet with a bunch of custom PIDs in the first post. Please confirm / report issue with any of them so I can track it with the group effort.
     
    #24 usbseawolf2000, Jul 21, 2011
  5. usbseawolf2000

    usbseawolf2000 HSD PhD

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    Torque version 1.4.94 supports the custom PIDs to be imported directly from micro SD card. I added the CSV file (with 117 PIDs) in the first post along with two additional screenshot.
     
    #25 usbseawolf2000, Jul 27, 2011
  6. 2009Prius

    2009Prius A Wimpy DIYer

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    Thanks for documenting it. I don't think this formula is correct:

    Anyone got the correct formula (agreeing with blC & buC)?
     
    #26 2009Prius, Jul 28, 2011
  7. usbseawolf2000

    usbseawolf2000 HSD PhD

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    The unit may be F instead of C. Does it make sense or is it totally off?
     
    #27 usbseawolf2000, Jul 28, 2011
  8. 2009Prius

    2009Prius A Wimpy DIYer

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    It's off a lot for my 2009 Prius, either F or C. Give it a try on your car and we can compare notes.
     
    #28 2009Prius, Jul 28, 2011
  9. usbseawolf2000

    usbseawolf2000 HSD PhD

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    Prius was parked in a cool garage. Outside air temp was 82 deg F. So, 72 deg F for the battery makes sense to me. I'll update the unit from C to F.

    [​IMG]
     

    Attached Files:

    #29 usbseawolf2000, Jul 28, 2011
  10. 2009Prius

    2009Prius A Wimpy DIYer

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    Not so fast. Compare them with blC and buC, or blF and buF if you like. Take a drive in a warm day without A/C so you can warm up the HV batteries. Let blC and buC rise up a few degrees and see if the battery temperatures follow. Mine don't, at least not the same magnitude.
     
    #30 2009Prius, Jul 28, 2011
  11. usbseawolf2000

    usbseawolf2000 HSD PhD

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    Unfortunately, I don't have a ScanGauge II to do that test.

    I checked the xGauge for blC and buC. They are using Mode 03 at PID C3.

    Battery Temp 1 is using Mode 21 at PID CF. So they are from two different ECUs.

    I believe CF is the HV Battery ECU. C3 is higher level because it also reports MG1, MG2 and set target engine RPM. Mode 21 is Toyota specific mode. Mode 3 is the generic DTC mode.

    Therefore, I think Battery Temp 1 is more accurate.
     
    #31 usbseawolf2000, Jul 28, 2011
  12. usbseawolf2000

    usbseawolf2000 HSD PhD

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    In my spreadsheet, C3 has temp for MG1, MG2 and their inverters. Can you check them against blC and buC?
     
    #32 usbseawolf2000, Jul 28, 2011
  13. 2009Prius

    2009Prius A Wimpy DIYer

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    ECU identification is in the header (for example 7E3), not the query code following it. 3C3 is the header, not "Mode 03, PID C3".

    At any rate if you don't trust blC and buC (I really don't see why not) then don't use them. Just start collecting the HV battery temperature data using your formula and see how much it moves with the ambient temperature. (Hint: not much at all)
     
    #33 2009Prius, Jul 28, 2011
  14. 2009Prius

    2009Prius A Wimpy DIYer

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    #34 2009Prius, Jul 28, 2011
  15. usbseawolf2000

    usbseawolf2000 HSD PhD

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    Nope, haven't seen or read that thread yet. Will do later.

    I also recall you did the test that showed the threshold temp when the HV battery fan kicked in. So I trust you more. :D
     
    #35 usbseawolf2000, Jul 28, 2011
  16. vincent1449p

    vincent1449p Active Member

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    I don't think it is correct. If you substitute K & L with 0 & 0, you get 32 for the min. value. If you substitute K & L with 255 & 255, you get 73.73 for the max. value.

    From the Repair Manual, the range is -40 to 194 ºF. You can try this formula:

    (234 * 256 / 65535 * K) + (234 / 65535 * L) - 40

    Vincent
     
    #36 vincent1449p, Jul 28, 2011
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  17. usbseawolf2000

    usbseawolf2000 HSD PhD

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    Thanks Vincent. I will try that formula tomorrow. Care to explain how you derived it from knowing min and max?
     
    #37 usbseawolf2000, Jul 28, 2011
  18. vincent1449p

    vincent1449p Active Member

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    Certainly.:)

    Let Tmin. = -40, Tmax. = 194, y = Calculated temp., x = Value read by Torque

    y = Mx + C

    When y = Tmin., x = 0,
    -40 = M * 0 + C
    C = -40

    When y = Tmax., x = FFFFh = 65535,
    194 = M * 65535 - 40
    M = 234 / 65535

    y = 234 / 65535 * x - 40

    Now, to split x into K & L,

    y = 234 / 65535 * ( 256 * K + L ) - 40

    (234 * 256 / 65535 * K) + (234 / 65535 * L) - 40

    Vincent
     
    #38 vincent1449p, Jul 29, 2011
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  19. usbseawolf2000

    usbseawolf2000 HSD PhD

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    I tested this morning. I saw Battery Temp 1 = 89 degrees while Battery Temp 2 = 72.89. I'll make updates to all 3.
     
    #39 usbseawolf2000, Jul 29, 2011
  20. usbseawolf2000

    usbseawolf2000 HSD PhD

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    Vincent,

    Your explanation got me thinking about the HV Battery SOC. Following your method, I got the following formula.

    100 / 255 * A​

    However, isn't the SOC's formula 0.5 * A?
     
    #40 usbseawolf2000, Jul 29, 2011
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