openinverter forum

aot93 wrote: ↑Sun Sep 04, 2022 10:04 am To add some more to the above:

HV voltage at the inverter is only sent until a torque request is made to the inverter, so it's useful only for pre-charging.
Once a torque request has been made it looks like the byte order changes, I've not worked that out yet to get voltage reading from the inverter whilst it's running. The BMS take care of voltage limit and the charger reports HV from the other side of the contactors

LRBen wrote: ↑Thu Sep 08, 2022 8:35 pm On to getting it spinning now. I think my issues could be one of two things.

RSDN.

tom91 wrote: ↑Thu Sep 08, 2022 8:55 pm I have got builds and test rigs running with this floating. Can anyone confirm what this signal does, does the inverter contain a bleed resistor on the HV bus that gets activated using this signal or can?

Please share your code somewhere so others can review it. Spinning using the Rear inverter is quite straight forward if you know what canbus its looking for.

void inverterComms()
{
  if (timer50_1.check()) {
    readPedal();
    torqueRequest = targetTorque;
    curentTorque = torqueRequest;
    if (torqueRequest > (2000))
    {
      torqueRequest = 0;
      Serial.println("--!OVER TOURQUE!--");
    }
    if (torqueRequest < (-1000))
    {
      torqueRequest = 0;
      Serial.println("--!UNDER TOURQUE!--");
    }


    torqueLoByte = lowByte(torqueRequest);
    torqueHibyte = highByte(torqueRequest);

    CAN_message_t msg2;
    msg2.id = (0x287);
    msg2.len = 8;
    msg2.buf[0] = 0;
    msg2.buf[1] = 0;
    msg2.buf[2] = torqueHibyte;
    msg2.buf[3] = torqueLoByte;
    msg2.buf[4] = 0;
    msg2.buf[5] = 0;
    msg2.buf[6] = 0x03;
    msg2.buf[7] = 0;
    Can0.write(msg2);
    torqueRequest = 0;
    delay(1);

  }
  
  if (chargerEVSE.check()) {
    CAN_message_t msg3;
    msg3.id = 0x371;
    msg3.len = 8;
    msg3.buf[0] = 48;
    msg3.buf[1] = 0;
    msg3.buf[2] = 0;
    msg3.buf[3] = 0;
    msg3.buf[4] = 0;
    msg3.buf[5] = 0;
    msg3.buf[6] = 0;
    msg3.buf[7] = 0;
    Can0.write(msg3);
    delay(1);
    CAN_message_t msg4;
    msg4.id = 0x285;
    msg4.len = 8;
    msg4.buf[0] = 0;
    msg4.buf[1] = 0;
    msg4.buf[2] = 20;
    msg4.buf[3] = 57;
    msg4.buf[4] = 143;
    msg4.buf[5] = 254;
    msg4.buf[6] = 12;
    msg4.buf[7] = 16;
    Can0.write(msg4);
    delay(1);
    CAN_message_t msg5;
    msg5.id = 0x286;
    msg5.len = 8;
    msg5.buf[0] = 0;
    msg5.buf[1] = 0;
    msg5.buf[2] = 0;
    msg5.buf[3] = 61;
    msg5.buf[4] = 0;
    msg5.buf[5] = 0;
    msg5.buf[6] = 33;
    msg5.buf[7] = 0;
    Can0.write(msg5);
  }



}

aot93 wrote: ↑Thu Sep 08, 2022 9:25 pm I would check:
Physical connection between the motor and inverter, if it's not 100% it won't work
DC HV is it over 200v?

I'ts been a while since i did tests on the RSDN, mine is switched to ground in normal operation, otherwise it's pulled to 12v.

Did a quick scan of your code and not seeing anything obvious, something to try is a dedicated metro timer for the inverter comms I seem to recall some inconsistency when sharing timers

aot93 wrote: ↑Fri Sep 09, 2022 12:47 am Actually a closer look at your code and it looks like your torqueRequest is not scaled correctly.

It looks like throtlepot should be *10

and you are missing the torqueRequest += 10000 offset.

Worth checking what you are sending via savycan, a 1nm request should have 0x27 on b2 and 0x1a on b3 of 0x287 which is decimal 10010
Formula is (a*256+b-10000)/10

LRBen wrote: ↑Fri Sep 09, 2022 3:02 pm It's all good now! Have spinning wheels. Thanks for the assistance! I think I see how that throttle map works now as well.

To confirm RSDN, when floating or tied to 8v, inverter works. When tied to 12v, inverter shuts down. As per the wiki.

mjc506 wrote: ↑Fri Sep 09, 2022 9:10 pm Does anyone have any photos of the (rear) inverter open? Or front!

tom91 wrote: ↑Fri Sep 09, 2022 3:40 pm Could you do the following, measure HV voltage decay (so precharge then close contactors as normal, then open contactors after reaching full votlage) when leaving RSDN floating and with RSDN tied to 12V.

As the decay on the inverter without toggling RSDN is a long time, then again the outlander probally uses the DCDC or PTC to get rid of the HV voltage in caps.

tom91 wrote: ↑Sat Sep 10, 2022 3:57 pm I wrote my code so I can flip it. Yes the torque commands flip when spinning the other way. Multiply by -1 before you apply the 10000 offset.

    torqueRequest1 = torqueRequest *(-1);
    torqueRequest1 += 10000;
    torqueLoByte = lowByte(torqueRequest1);
    torqueHibyte = highByte(torqueRequest1);

tom91 wrote: ↑Sat Sep 10, 2022 4:39 pm Please provide the declaration check if you decalred these as singed intergers, and 16bit or more.

byte torqueHibyte = 0;
byte torqueLoByte = 0;
int torqueRequest = 0;
int torqueRequest1 = 0;
int targetTorque = 0;
int curentTorque = 0;
float throttlePosition = 0;
int Pot_A = 18; // was thermistor pin
int brakeinput = 27; // ground input, orginally simppilot

aot93 wrote: ↑Sat Sep 10, 2022 4:58 pm A grab of a few frames from the CAN bus could be useful here also

aot93 wrote: ↑Sat Sep 10, 2022 5:30 pm Are you casting that throttlePosition float to int later?

If not that can cause you problems, mixing floats and ints is often problematic.