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

See below. That should sum it up.




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.

 

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

 

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

 

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.

 

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.

 

The unit may be F instead of C. Does it make sense or is it totally off?

 

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.

 

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.

 

In my spreadsheet, C3 has temp for MG1, MG2 and their inverters. Can you check them against blC and buC?

 

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.

 

Thanks Vincent. I will try that formula tomorrow. Care to explain how you derived it from knowing min and max?

 

I tested this morning. I saw Battery Temp 1 = 89 degrees while Battery Temp 2 = 72.89. I'll make updates to all 3.

 

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?