3 ms·

DCFC do have car-id communication between the car and charger, and they can be configured to connect to specific accounts from the car so you can"plug and charg

by rnk 4y ago

DCFC do have car-id communication between the car and charger, and they can be configured to connect to specific accounts from the car so you can"plug and charge" with nothing else if your car is registered with the charger network. I've never heard of a system that took cash, they used to take credit cards at some chargers, now they often require an app install on your phone (and you hope your phone didn't die). Level 2 chargers in the us use j1772. I'm not aware of any vehicle id communication but there could be something? This article was about European chargers, I suspect (without direct knowledge) they use the same "unauthenticated" level 2 protocol with j1772?

nhecker 4y ago
I was thinking similar thoughts the other day. I believe both J1772 & CHAdeMO essentially invite the external equipment onto your vehicle's CAN bus, based on my (fallible) memory that my car's VIN, SoC, etc., have shown up on various external equipment's displays during past charging sessions. Interestingly, while stopped at a CHAdeMO charger operated by a network I hadn't used before I was allowed to charge for free based on it being my first time. (Presumably because my VIN had never been observed there.) It made me wonder that it ought to be fairly trivial to spoof one's VIN through the use of some kind of CAN bus proxy. -- edit: looks like I might be wrong about the CAN bus bit, but I do recall seeing my VIN & SoC show up on some EVSE displays. Perhaps it's a trick with the Control Pilot Signal?
- danans 4y ago
  > but I do recall seeing my VIN & SoC show up on some EVSE displays. Perhaps it's a trick with the Control Pilot Signal? You were probably using a CCS charger. Level 3 CCS chargers have a communication capability for stuff like vehicle id and state of charge, which enables plug-and-charge functionality. Level 2 chargers do not.
  - nhecker 4y ago
    It was definitely not a CCS charger; my car will only play with CHAdeMO & J-1772. Aren't the only differences of CCS over J-1772 the addition of DC power pins at pack voltage, and the lack of populated AC line voltage pins? Or is there an alternate signaling protocol in use as well? I'll have to pay closer attention to the display the next time I'm at a public charger.
danans 4y ago
> Level 2 chargers in the us use j1772. I'm not aware of any vehicle id communication but there could be something? I don't think J1772 provides vehicle ID communication. I know because I wanted to see if I could "lock down" my relatively smart EVSE (a Juicebox) to particular vehicles, and the support engineers at the company told me that it's not possible because no vehicle ID is provided over J1772.

by rnk 4y ago

nhecker 4y ago

I was thinking similar thoughts the other day. I believe both J1772 & CHAdeMO essentially invite the external equipment onto your vehicle's CAN bus, based on my (fallible) memory that my car's VIN, SoC, etc., have shown up on various external equipment's displays during past charging sessions. Interestingly, while stopped at a CHAdeMO charger operated by a network I hadn't used before I was allowed to charge for free based on it being my first time. (Presumably because my VIN had never been observed there.) It made me wonder that it ought to be fairly trivial to spoof one's VIN through the use of some kind of CAN bus proxy. -- edit: looks like I might be wrong about the CAN bus bit, but I do recall seeing my VIN & SoC show up on some EVSE displays. Perhaps it's a trick with the Control Pilot Signal?

danans 4y ago
> but I do recall seeing my VIN & SoC show up on some EVSE displays. Perhaps it's a trick with the Control Pilot Signal? You were probably using a CCS charger. Level 3 CCS chargers have a communication capability for stuff like vehicle id and state of charge, which enables plug-and-charge functionality. Level 2 chargers do not.
- nhecker 4y ago
  It was definitely not a CCS charger; my car will only play with CHAdeMO & J-1772. Aren't the only differences of CCS over J-1772 the addition of DC power pins at pack voltage, and the lack of populated AC line voltage pins? Or is there an alternate signaling protocol in use as well? I'll have to pay closer attention to the display the next time I'm at a public charger.

danans 4y ago

> Level 2 chargers in the us use j1772. I'm not aware of any vehicle id communication but there could be something? I don't think J1772 provides vehicle ID communication. I know because I wanted to see if I could "lock down" my relatively smart EVSE (a Juicebox) to particular vehicles, and the support engineers at the company told me that it's not possible because no vehicle ID is provided over J1772.