Post AbFSN8yzo0MFFdD2w4 by alex@social.moreati.org.uk
 (DIR) More posts by alex@social.moreati.org.uk
 (DIR) Post #AbFSN8yzo0MFFdD2w4 by alex@social.moreati.org.uk
       2023-10-28T21:30:56Z
       
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       Can an electric vehicle charger (EVSE) know how how charged the connected vehicle is? Maybe, a thread 🧵.#ElectricVehicles #EVCharging
       
 (DIR) Post #AbFSNRBM8mwLhB8AhU by feld@bikeshed.party
       2023-10-29T02:28:32.716505Z
       
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       @alex My Leaf with CHAdeMO would show the charging % on the EVSE's screen. I expect this capability to exist in all the charging standards.
       
 (DIR) Post #AbFSNS4epBAySh0Ktk by alex@social.moreati.org.uk
       2023-10-28T21:35:47Z
       
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       The standard connector in the UK/Europe is CCS Type 2. One of the pins is Pilot Connect (PC). When a vehicle is plugged in a handshake happens1. The vehicle drives PC low (to 9 volts), saying "Helllo, I'm connected".2. The EVSE sends a PWM signal back on PC, saying "Maximum current available is X amps".3. The vehicle drives CP lower (to 6 volts), to say "I'm ready, supply the juice". https://www.picoauto.com/library/automotive-guided-tests/charger-vehicle-communications-type-2/
       
 (DIR) Post #AbFSNTniP8oPoj5plg by alex@social.moreati.org.uk
       2023-10-28T21:50:29Z
       
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       Optionally the EVSE can send the PWM signal at 5%, which is outside the standard range (10% - 96%). The vehicle and the EVSE can then negotiate a 2-way protocol over the PC wire, if they both support it. Examples mentioned: Local Interconnect Network (LIN), Single Wire Controller Area Network (SWCAN) bus. I don't know how widespread such support is, but I want to dig.
       
 (DIR) Post #AbFSNVTaAxtd0rgmfI by alex@social.moreati.org.uk
       2023-10-29T01:03:38Z
       
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       Tentative findings: very few (if any) AC chargers implement 2 way High-level communication (HLC) over the PC wire. This is predominantly (exclusively?) a feature of DC rapid chargers, the standard is ISO 15118. For now OEM vehicle telematics seems to be the least worst game in town for intelligent EV charging at home.