[Ovmsdev] Progress with the Renault Twizy's remote start/stop.
nikki at littlecollie.com
Sun Apr 21 23:26:47 HKT 2013
So today I finally ventured underneath and inside the Twizy with a view to find out a little more about the Twizy charging setup. The first thing was to find out more about the charger and the type of equipment we are dealing with.
First off, I removed the mat and the floor from inside the Twizy, giving me some easy view of what the inside of the Twizy looked like. Then I got the Twizy up on ramps and removed the front belly panel, which I presume is Aluminium. (Or Aluminum? ;) ) The latter comes off really easy: you just need an M14 and M10 wrench.
With the bottom panel off, I could more easily see the Charger and DC/DC converter, which is actually the same unit. With some googling, it turns out that the model is based on an ELIPS 2000W charger by IES Synergy.
Sadly, despite an hour of looking online, I can't find ANY manuals, schematics, or anything else to identify exactly what is what with regards to pinout.
But I have identified:
DC 12V out
Comms port (presumably CAN bus, but I can't be sure)
Temperature monitor/Battery pack monitoring cable.
DC 60V out.
The fact that the charger appears to have comms makes me think that perhaps there is some luck for sniffing on the CAN bus for charger information. I don't have a logger, so perhaps someone with logging could log the Twizy while charging to see if there are any info on the can bus?
The mains input is also interesting: I can clearly see where the mains lead comes in from the front of the Twizy, as well as where the earth splits to chassis and the mains live and neutral passes through an APEX 280 connector on its way to the charger. If we can't figure out the comms for the charger, this seems like a logical place to connect a short loop to a double-pole NC relay. This would certainly give us the ability to control power on and off, but it would also (I think) remove the "don't power on while plugged in" safety in the Twizy. Technically then, if we used this setup and energised the NC relay to stop charging, you could then get IN the Twizy, power it up and try to drive off with it still plugged into the mains. NOT good!
But there's also a mystery cable coming out of the mains input which isn't any of the three usual cables. It's smaller, and may be some form of sensor placed at the car-end of the cable (I don't think the mains cable is anything other than standard 3-core so can't travel the length of the mains cable)
Any suggestions gratefully received. I think I can come up with some charger relay hardware, but It's going to be a little long-winded.
Photos, for the curious, are here:
P.S. Got a cron job running last night so that my Twizy OVMS logs are automatically pulled down daily and put on my Raspberry pi. ;)
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