teslaModelS充电协议

TESLA充电协议

It is almost certain (from what Tesla have said publicly and from the practicalities of the connectors used) that Model S uses the J1772-DC signalling. This is the same signalling as specified for the Type2 connector in DC mode.

这几乎是确定的（从tesla公开的宣传和所使用的连接件），Model S使用了J1772－DC信令，这与Type2连接器在DC模式的信令是相同的。

DC mode starts by the EVSE driving the pilot signal at 5% duty cycle (10% is the minimum used to signal AC current - 10% -> 6A AC, 96% -> 80A AC). Car and EVSE then establish a communication channel using an RF carrier superimposed on the pilot pin. This is confusingly described as 'Power Line Carrier' since it uses the same modulation etc. as the Homeplug system for data over mains wiring, but in this case it is not using the J1772/type2 power pins! This subset of HomePlug is known as 'GreenPhy' and is used for various other applications such as Smart Meters.

直流模式开始，充电设备输出占空比为5%的导频信号（10%用于最小交流电流信号，10%表示6A，96%表示80A），充电设备与汽车之间利用加载在导频信号上的RF载波建立通信信道，这里用“电力线载波”来描述比较不恰当，但是使用的是同样的调制等，在Homeplug系统中，数据是加载在电源线上，但是在这里，它使用的不是J1772/Type2的电源脚！这个Homeplug的子集是已知的Green PHY，它用于其它的应用如智能仪表。

Having established this data link, car and charger communicate details of the charging session using a high level XML protocol specified in the SAE/IEC documents.

建立了这个数据连接，汽车与充电设备之间进行详细的充电进程通信，期间使用的是高级别XML 协议，这个协议在SAE/IEC有文档说明

Thus it can be easy to select DC mode if it's just a 5% duty cycle PWM, but the PLC modulation is the problem. Yes it's possible to find chip or module to do the modem low level layer, but the problem will probably be on the high level communication protocol, it's pretty sure that Tesla implemented a proprietary data exchange between the car and the supercharger. And I see that PLC/greenphy chip always embeds AES128 cryptography capability, thus all data exchange are probably encrypted. This way they can be sure nobody can use their supercharger with another car and diy adapter cable...

因此，使用5%占空比的PWM脉冲可以容易的进入直流模式，但是PLC调制是问题，找到芯片与模块做低级别的调制比较简单，但问题可能会出现在高级别的通信协议中，可以很确定，Tesla 在汽车与超级充电桩之间加入了专用数据交换，所我所知，PLC/GreenPHY芯片都是嵌入了AES128加密功能，因此所有的数据交换都可以加密，通过这样，他们可以确保没人能用他们的超级充电站给其它汽车充电或DIY适配器

With these informations it seems it will be difficult or impossible to a third party CHAdeMO adapter cable for the Tesla

上述信息表明，第三方的CHAdeMO到Teslaa的适配器有可能比较困难或不可能