Unlocking the power/torque of Prius gen 3 drive train?

[Ghia66]

Thanks Tom, by run I figure you mean on the road?

Is there any other tests that I could do that may help while the car is a stationary test bed?

[tom91]

Yes on the road, currently no issues going 13000 rotations stationary. So we need to figure out what is stopping it from doing so on the road.

[Ghia66]

Thanks Tom, will report back.

[Ghia66]

Went for a test drive.
First run had quite a lot of traffic so didn’t get anywhere near the max.

Second run was better as there was less traffic. Didn’t have the GPS on… the hugely optimistic cable driven Speedo showed 80mph.

Third run was accelerating been frequent speed bumps.

[tom91]

Only first plot we see the 7000 rpm as we seen before. but not with a "steady" state cruise at that speed so hard to judge what is going on.

Ideally a log of accelerating "flat out" to max speed is best. Then we can see if the Potnom tapers off due to current draw or voltage. If it does not but the drive unit draws less power it means there is an internal limit.

[Ghia66]

Thanks Tom, so try and get up to maximum speed and stay there for a while?
I will have to go searching for a good traffic free road!

Should I add any other values such as torque to the logging?

[tom91]

No, torque is potnom directly translated and too large to work nice with IDC and UDC

[Ghia66]

Thanks Tom, I will get on it.

[Ghia66]

Two runs; one in restrictive traffic…the other I was able to put the pedal to the floor and keep it there until the car would go
no faster.

[tom91]

I am confused to what the graphs show, none show anything near 7000 rpm.

did you try saving logs? It be great if someone else chimed in with info on how to get better logs, I have no experience with this.

[Ghia66]

Thanks Tom, I have asked Greg and he had some good suggestions on logging which I will try,
Will I log on the left: Potnom + UDC + IDC and on the right: Speed?

[Bigpie]

A good way to get logs is to use the can map to broadcast data and use savvycan to record

[tom91]

Will I log on the left: Potnom + UDC + IDC and on the right: Speed?

Yes that is what you have been doing it looks like. Just the graphs are a bit short and do not show top speed.

[Ghia66]

A good way to get logs is to use the can map to broadcast data and use savvycan to record

Thanks Jamie, is there a “beginners” blurb anywhere that I can study to see what is involved/how to get started doing this?

[Ghia66]

Yes that is what you have been doing it looks like. Just the graphs are a bit short and do not show top speed.

Thanks Tom, I will try the suggestions to get longer records and get some top speed logs

[tom91]

Data points, increase that number under the graph.

[Ghia66]

Thanks

[Bigpie]

Do you already have a way of can logging? If not https://lilygo.cc/products/t-can485 are a good option and can also run the can based interface so you can have it located for a better signal

[Ghia66]

Thanks Jamie, I will check this out.

Cheers Les

[Ghia66]

So recorded two runs; one in traffic and another one flat out!

Greg’s suggestion was spot on for getting longer logs…(I recently started using Windows 11) lower the display resolution. Lowered from 1920 x 1080 to 1600 x 900 and it worked!

[tom91]

Not really, did you bump the data points number as requested? Still only 88 measurements.

Oh log 14 is perfect, I just mapped it.

[tom91]

So all data + Power Calcualted in kW

Now just kW + Potnom on left and speed on right.

Notice how we reach a steady state power even though potnom is flat.

The steady state of around 25-27kW is a clue. I will review some of the HTM code for the toyota prius once I have moved house. Busy moving this weekend until next one. Maybe during the week I got a few minutes, all be it without internet at my new house

[Ghia66]

Thanks Tom, very exciting!
Good luck with the move and internet… hope it’s not too challenging!

[Ghia66]

So during a routine maintenance inspection, I discovered this on the passenger side driveshaft!
The driveshafts have been sleeved, interference fit and pressed then welded by my local machine shop.

I decided as you do to do a quick launch in drive to see if there was any slippage.(I recorded this on my phone which was gaffer taped unsuccessfully to the body!)…so no video!!


The driveshaft didn’t appear to move, but I think it’s time to crack out the welder and do some welding that will include three plug welds of the sleeve to the shaft.

[arber333]

So during a routine maintenance inspection, I discovered this on the passenger side driveshaft!
.....
The driveshaft didn’t appear to move, but I think it’s time to crack out the welder and do some welding that will include three plug welds of the sleeve to the shaft.

Here is what i proposed a while back

https://www.aircraftsystemstech.com/201 ... craft.html

https://leafdriveblog.wordpress.com/201 ... extension/

Also more video for welding driveshafts...