Who’s good in analysing statistics?
We got some input so the table on the Battery Health Status grew up lacks still some interpretation…
We get a lot of questions about the braking system. Here is how it really works.
Note that if you put the car in N, no motor braking is possible and the ESC will command all braking through the friction brakes.
In normal operation this means braking is almost entirely regenerative, with the following exceptions:
Here is a revealing graph: yellow (hard to see, hidden under purple and red) line is the driver requested torque. The blue line is the regenerative torque and you can see the hydraulic system (red line) compensating for any difference. Note that the final cut over is at a very low energy state (roughly last half second before full stop, 10% of the time, 1% of the energy).
*) Other than this graph shows, when serious braking is applied very fast (3rd bullet above), and therefore, the hydraulics kick in immediately and substantially, they are not released anymore and replaced by motor torque. So, for economical, max regen braking, it is better to not only push the braking pedal not too deep, but do do it gently too.
ps: look here for a description of the computers in the Zoe.
pps: there is a ton of information in this document on scribd.
ppps: Here is some more info on braking.
We have some exciting news this week.
CanZE is now available in the Google Play Store. Once installed that way, updates will come to you a tiny bit slower, but fully automated. We will maintain a weekly release schedule as long as features are changed or added as frequently as they are now. When we’re confident that the updates in the Play Store come through fast enough, we might close the download page here.
We were able to shed a lot of code that was no longer necessary, meaning easier to maintain, and less error prone. We hope to have added again a bit of stability.
Also, we have gained a lot of information about the Zoe this week, straight from Renault. Consequently, we also now know that a few things in CanZE are simply wrong. Friction braking is far smarter in the car than we anticipated, and that code needs to be rewritten. The information
came in too late to make to this weeks release, just know that the friction braking bars are not correct for now JUST made it in time for today’s release.
Also, the firmware screen was unfortunately picking up a wrong field. This has been corrected, but of course we need to work on reference versions again based on your input. Please do report newer versions if you see them in your car.
Today I have spoken with a Renault specialist and to make a long story short: my definition of friction braking is WRONG. In normal operation, the brake system is entirely “fly by wire” and does not perform friction braking as CanZE reports. I will fix this, but I doubt it will make this weekend-release. Long story short, Zoe uses far more motor braking than anticipated. To be continued.
The weekly build we have coming up for you is mostly one of serious un-cluttering. We have moved all experimental and playground stuff out of the way and to a new screen. This can be accessed through the “three dots” menu, just next to the settings. Developers now have each have their own playground. Go there at your own risk!
A very nice enhancement is that time-plots are now saved, so their data is not lost when switching screens.
The driving screen now displays a real time kWh/km. I’ve been running this for a few drives and I’d say it is more pressing than the raw kW in the dash. Quite the eye opener!
For the UK drivers, there is now a “Miles” tick in the settings screen, and it already works for the text based screens.
Maybe somewhat boring but still worthy news is that we have significantly stabilized and speed up ELM again. And as we’re getting more confident about CanZE restoring order when things go wrong, there is now an option in the setting screen to change the log level, enabling you to get rid of those blasted warnings popping up. For the daring, builder people, the Due based hardware is getting more integrated too and is VERY responsive. See Bob’s blog post below this one.
We discovered that Firmware versions can be dependant on the hardware version of certain components. We’re not ready to take up that challenge for several reasons. Just know that the dealer might be right if he tells you that really no, there is no update for your car while CanZE says there is.
Enjoy and stay tuned!