Motor temp via can

[FFMan]

I'm using my V1c board in a Prius inverter to drive the Outlander rear motor. I've wired one of the motor temp sensors to the ampseal with a pull-up resistor as recommended by Bigpie.

On the inverter web page i have set the temp type to Outlander front and it displays what looks like a plausible value. I'd like to get get this sent via can, but neither Temp-HS or Temp-motor match the value shown in the GUI. Temp-hs seems to hover around 80 even at idle and temp-motor show is a consistent -40.

thanks

[johu]

More context!
What is the output of "can print" (in Custom Command)
How are you decoding and what is the raw value on the CAN bus?

[FFMan]

thanks for the reply.

The question was not so much about can, as to how to elicit the correct value i think. You can see in the first picture the sensor setup and a plausible value along side it. However the can set up offers temp-hs and temp-motor but neither value corresponds to the plausible value. Just wondering how i get that value mapped to a can message as it looks usable ?

TempSetup.PNG (2.92 KiB) Viewed 538 times

TempSpots.PNG (4.74 KiB) Viewed 538 times

[Pete9008]

You may need this to sort out the heatsink temperature viewtopic.php?p=56996#p56996

The motor temperature looks like a wiring problem as it's stuck at the minimum (equivalent 0V to ADC input).

Edit - That's interesting - didn't realise that you could combine multiple values into a single CAN message like that - nice feature!

Edit2 - Or can you? think it might just send out two separate messages on that CAN ID, one for each parameter?

[johu]

Edit2 - Or can you? think it might just send out two separate messages on that CAN ID, one for each parameter?

Nope, combined

[Pete9008]

Nice - need to look at the code to see how you managed that

[arber333]

Hm... i am planning to make a simple CAN based temp module with several DS18B20 sensors on the module.
https://www.analog.com/media/en/technic ... s18b20.pdf

I would like to make the module speak CAN and it would be really good if inverter would be able to understand those sensors or messages.
May i suggest a kind of Outlander report? A single byte report with [deg centigrade] + 40.

[johu]

You want the inverter to receive temperature via CAN?
Could be added as a new sensor type CAN that stops updating tmphs/m from the ADC and the user is then responsible to map correctly to tmphs and/or tmpm

[arber333]

You want the inverter to receive temperature via CAN?
Could be added as a new sensor type CAN that stops updating tmphs/m from the ADC and the user is then responsible to map correctly to tmphs and/or tmpm

Well ability to report CAN temp would be good in case of a DCDC, AC compressor, heater or charger. All of those from Outlander hybrid are reporting its temperature in one byte or another. Even inverter is reporting on the motor and IGBT temperatures.
My idea is to standardize the way temperature is reported, or recognised via CAN.
Then make a pic18F based module with DS18B20 single wire sensors and CAN transciever.

But! That should be done in a failsafe way. This means if one does not make the correct mapping of the CAN byte for temp then inverter PWM should not run.

[FFMan]

Edit - That's interesting - didn't realise that you could combine multiple values into a single CAN message like that - nice feature!

lol - never occurred to me you couldn't, which is why the 10 message limit didn't seem too much of a hardship.