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- เผยแพร่เมื่อ 13 ต.ค. 2024
- -Battery: total 60 cells LiFePO4 with each approx 80Ah. 30s2p makes 100V and 160Ah = 16kWh gross cap
-Dual drive unit got a little smaller
-BMS (cell voltage acquisition) and passive balancers started
Next step: setting everything into operation (again) and having the Twizy back on the ground again :-)
I think what you’ve done is unbelievable. Thanks for sharing
i dont even have a twizy
but your project made me want one
+1 sub for you
Amazing project, thanks for sharing. Please can you please explain how do you manage the CAN bus communication between the Battery Management System and the Vehicle Control Unit ? Were you able to understand the meaning of each hexadecimal message that is between the VCU and the BMS? Thank you in advance for your help.
There was no need to understand any original CAN message, because I kicked out both the original BMS and VCU and developed everything on my own - having everything under my own control
I like the dual motor drive. No need for a differential. Have you worked out how to make the outer wheel in a turn drive harder than the inner wheel? I worked on a tadpole trike project with dual front wheel outrunners. I incorporated traction control from the hall signals so that each motor would pull properly based on some rules. Angle of turn was also worked in so the outer wheel would spin a bit faster than the inner wheel depending on angle of turn. I needed 2 analog outputs and 1 analog input for the throttle input and controller outputs. All the rest was digital signals from halls. An arduino nano was plenty powerful enough to handle all of that.
The hardest detail was working out keeping the tires powered under full acceleration. A bump in the road would lift a tire off the road for a second and the coding would detect a faster spinning motor. This would cause the throttle for that wheel to drop slightly and then the wheel would be back on the ground again and running at the same speed as the other wheel. There was a delay between sensing motor RPM and throttle correction. This created some oscillating throttle weirdness as a result. My solution was to monitor the halls based on both motor speeds averaged together. I also averaged the hall pulses for each motor. This required a scale based on average motor RPM from both motors. At low speeds, motor speed monitoring was done more slowly than at higher speeds. Throttle balancing reactiveness was reduced at slower speeds than at higher speeds. The effect was that I eliminated the throttle oscillating problem by being less reactive to wheel speed changes no matter how fast I was traveling.
Angle of turn was pretty rudimentary but sufficient. I used 9 reed switches. This gave me 4 angle positions for left and 4 for right turns and a center position for straight ahead. It could have been better with more granularity, but my solution worked well enough that I didn't care to go further. I had center, hard locked either extreme and 3 more positions in either direction. It was pretty good and made turns faster.
Hi! I haven't thought that much yet about the implementation of the el. diff.
Thx for your post, very inspiring, fits to my ideas how to deal with it. Only significant difference: I'm planning to us a linear poti detecting the steering angle.
Unfortunately progress is currently unsatisfactory,just little time for the project :-(
Do you have some public documentation somewhere?
Why not try with 2 controllers?
@@dimitaratanasov2466 Thats exactly what he is doing. The problem is getting the 2 controllers to track properly based on angle of turn and if you have a situation where one wheel is slipping more than the other. These are functions of a mechanical differential that needs to be simulated in dual controllers.
This twizy would be real beast! Good luck
Hey exciting project 💪 I think I saw an Cityel in the background in one of your videos. Have you considered putting revolt rv-160 pro in Cityel? If not why? :-) I have thought of putting one in my Cityel. Do you think this motor will fit the Cityel well, performance vice? Looking forward to new videos on the tvizy project
Hello
Yeah, sure I considered that and came to the conclusion that this would be a little to much power for the little vehicle. Anyway, the revolt should work nicely in a Cityel, especially if you choose a fairly low kV, reducing the gear ratio to 1:3...4
Feel encouraged to to that, and share your success :-)
nagyon erdekes hasonlit az en gondolatomhoz mas megoldassal !!
Здравейте, Особено съм впечатлен от това което показвате. Смяна на двигателя, 2 контролера за управление.... Как решихте проблема със зарядното, или и там поставихте ново (от друг вид)???
Разбира се, оригиналното зарядно устройство вече не беше съвместимо. Има ново зарядно устройство, което също е много по-мощно.
Qué voltaje tiene la original
Is there any reduction or its direct drive? What is the max rpm for max torque?
Fixed gear ratio of approx 1:4.5
I expect a max torque of around 70Nm each side, will get much clearer during upcoming test drives...
can you tell me please how to find this battery cells ? Name and size please
They are OSN, size 222x135x29.5. I am pretty sure meanwhile, aftre some years, there are many alternatives, probably better ones out there
@@nextev8794you helped me a lot. I appreciate it . Thank you very much
Thanks for sharing! Would you do video tutorial for twizy virtual bms?
I gladly share everything with you...almost ;-)
I'm not sure what is meant with "virtual" BMS!?
Does not need a virtual BMS as it has had all the electronics stripped out and replaced with a custom system.
You would only need the virtual BMS if you were using the original power electronic, Sevcon et al with a custom battery.
Me again!: so you got a Twizzy without battery or did the original wear out?
The battery rental expired and we gave the battery back. A local Renault garage took it out, measured it (still ok) and sent it back to France
@@nextev8794 Despite my original negative attitude to the Twizzy, this looks like an interesting vehicle. The frame is weight optimised, so more like a 4 wheel motorcycle! So are second hand Twizzy prices lower than they would be as they do not include the battery?
@@Tore_Lund Usually the battery rental contract is integral part of the vehicle and it's not that easy to get rid of it (both battery and contract). Anyway, since the battery communicates with the vehicle it's difficult to replace just the battery, that's why I threw away all the electronics hardware and started from scratch again.
@@nextev8794 That makes sense, and you went for LiFePO4 chemistry, so you couldn't just transplant the battery electronics that expect Li-ion cells!
Next question: Is this a motorcycle? I mean do you have to have it inspected every other year as you do with cars? The City-El as a 3 wheeler is a motorbike,, so you can do anything with it, but is the Twizzy then considered a quadricycle???
@@Tore_Lund Exactly, man! Almost... ;-)
Hello from germany du hörst dich deutsch an habe auch vor kurzem einen twizy gekauft was kosten denn diese batterien in der 15 kw version? Bzw hat deine serien batterie schon zuviel verlust gehabt schade das renault keine grössere für den twizy anbietet
The original battery was still fine, the battery contract just expired and I gave the battery back (which was everything else but trivial).
The new battery is composed of 60 cells OSN LiFePO4 85Ah.
@@nextev8794can i have a question how much the battery cost and how much is better the range after upgrade?
@@ladislavzajtko7099 Some years ago the batteries were about several thousands of bucks. Nowadays you will get 17kWh for 1000...1500.
Typical driving with a smooth style consumes 70...80Wh/km which leads to more than 200km of range, which I already achieved 😎
@@nextev8794
Thanks for the answer and from which country you are?
Hi what are the dimensions of 1 battery?
One battery cell is 222mm x 135mm x 29.5mm
Hi sir nice to see you can you please send me block diagram
Very complicated decision ... how many people can do it ????
Wrong question ;-)