So I have been watching Jack Rickard's shows and his most recent ones covered the topic of regen and does it actually work? You can watch them here Electric 1957 Porsche 356 Speedster EV
He came up the the conclusion that not only does regen not work it actually hurts.
So that got me thinking that I have seen regen supposedly working in the Prius and I thought it worked. At lest I could see the Ah increase a small amount. I just never measured it to see if it really does help.
Well today I tried an A B A test.
Now the course I ran was 2 miles in length and included 7 stops and all right hand turns. The speed varied from 25MPH to no more than 35MPH. I ran the course 3 times for each A B A test. The elevation change was some what small mostly flat with only a few hills if you could call them that.
I limited my AMP draw on acceleration to about 50A and my regen to about 60A. I did my best to replicate the acceleration and deceleration each time around while keeping the same speed on all parts of the course.
Since you cannot disable regen in the Prius the only way to not use regen is to shift to neutral before you take your foot off the pedal.
The first test was with regen. I started out at 16.50Ah and finished with 12.17Ah for a total Ah use of 4.33Ah. Thats .721Ah per mile.
The second test was with regen disabled by shifting to neutral when I took my foot off the accelerator. I finished with 6.20Ah for a total Ah use of 5.97Ah. Thats .995Ah per mile.
The third test was with regen again. I finished with 1.76Ah remaining for a total Ah use of 4.44Ah. Thats .74Ah per mile.
The CAN-View is what I use to monitor the Ah usage and according to it I have about 15.50Ah in the Hymotion battery I can use.
Now if I done my math right that means with regen I can go about 21 miles in EV mode on that course. If I did not have regen I could only go about 15 miles on that same course.
The engine did not come on at all during this test and I think my A B A test was accurate since I ended up with about the same numbers on the A A sides.
Is my testing and math correct? Do you see anything wrong with my test?
I think I will preform my A B A test again only start with no regen first and see what happens. Hopefully I will have enough energy in the battery to complete the test.
I have sent my results to Jack to see what if anything he says about it.