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

Yes, both MG1 and MG2 torque are 0 NM in Neutral. I checked the scaling option in the app. They are now at X1. The next higher up option is X10.

I checked MG2 torque this morning. I pushed the accelerator pretty hard and the highest I saw was 230 Nm.

How do I find out the right scale?

 

What are the internal resistance of the 14 modules in your 2009? How about the voltages?

My 2006 is inching toward 150k miles. I want to compare the "condition" of them with yours.

 

Just to follow up on the HV Battery Temp. Since I drove into work today, I parked under the sun. During lunch time when I started the car, MFD reported 91 deg F outside temp. The HV Battery Temp read 106 deg F. I checked the HV battery air intake temp and it was also 106 deg F.

So I checked the HV battery fan speed. It was at 1 lowest speed (0 = off, 6 = highest). I turned on the AC so the HV battery could intake cooler air but to my surprise, it did not change probably due to a short drive. I drove about 1 or 2 miles to get lunch and the battery temp continued to raise. When I got back to work, the battery temp got past 111 deg F (pic below) and the fan speed increased to 3. I still could not hear the fan so I went to the back and listened carefully and then I could.

Interesting geeky stuffs.

 

Sorry, there was a typo corrected in my local spreadsheet. I just updated the shared Google Spreadsheet. The formula is the same as the MG2 torque.

I wonder if the unit really is lbs-ft instead of Nm because I got 230 when I pushed it. I am going to floor it and see if I get near the official 295 lbs-ft spec.

 

My log is attached. I am anxious to find out the results!

 

Thanks for the suggestion. ICE was revving at 2,000 rpm and I let go of the brake. MG2 torque went up to 397 Nm. I'll just have to convert the formula to lbs-ft.

Lesson learned is, I was under-utilizing MG2 at low speed - not that I need to use more. The 82 lbs-ft torque ICE with power split device is plenty sufficient for mid to highway speed cruising.

 

I haven't gotten a chance to update PriiDash yet so I logged all 14 module voltages and internal resistances with the Torque. I hope that's ok to put in your spreadsheet to make graphs to compare.

 

Thanks for the analysis with the delta graphs. In term of raw numbers, I saw Voltage swing from close to 14 to 20 V and IR from 0.02 to 0.029 Ohm. How does it compare to your "fresh" HV battery with only 20k miles?

I believe my HV SOC also logged between 45 to 73% if I recall. To really compare V and Ohm, I believe the SOC swing should be similar also.

The main thing I want to compare is the IR and see how much it increased after 150k miles. Since I did not capture a baseline when my car was new, I guess this should give some idea.

It is great to see the HV battery still capable of charging and discharging at around 100 Amp!

 

Excellent graphs. The voltage is inter-related to the SOC so the wider it swings, the wider the voltage will be. I believe my data has wider SOC swing than yours, please confirm.

The surprise is the internal resistance. My modules have lower resistance than yours. I would expect mine to be higher since it is older with more miles racked up.

 

I was going by this graph from a SAE article. It appears to be the internal resistance at the pack level rather than module.

Cylindrical cells are in Gen1 and Rectangular cells are in Gen2 Prius.

 

Thanks Vincent. I updated the Google spreadsheet.

Motor2 Temp said it is transaxle fluid temp. I guess that's because MG1 is in contact with the transaxle fluid (liquid cooled) but MG2 isn't.