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Earlier quoted context omitted.
> Tesla really deserves some kudos for pushing the 48V architecture and the Ethernet-based communication. For the record, 42V systems were experimented with in the 1990s: * https://en.wikipedia.org/wiki/42-volt_electrical_system In the 2011 German automakers agreed to 48V as the next step after 12V: * https://en.wikipedia.org/wiki/48-volt_electrical_system BMW was the first the first with Ethernet: * https://www.marv…
This has been a real head-scratcher for me. BMW and other automakers could have vastly improved their cars by switching to 48V a decade ago, but they still keep just plodding along with 12V. I have no explanation for this.
Tooling all their shit to 48V is a massive undertaking with pretty much zero advantages.
Earlier quoted context omitted.
You can say that about any new standard. With that logic we'd all be stuck with knob and tube wiring.
Did cars ever use knob and tube?
Tesla really deserves some kudos for pushing the 48V architecture and the Ethernet-based communication. It drastically simplifies the wiring mess that is in a typical car. And it's not even close. Just watch the teardown of Cybertruck and compare its wiring to something like F150.
We can simplify the wire mess today by using more CAN bus devices. What is ethernet bringing to the picture?
Bandwidth: you can't ship backup camera video or entertainment system audio over CAN, for example.
CAN was meant for short, real-time packets. 8 bytes in initial configuration. CAN FD allows 64 byte packets.
You spend a LOT of protocol doing packet fragmentation and assembly using CAN--which then negates a lot of the real-time guarantees.
CAN should be used for the short safety critical stuff. Ethernet should be used for everything else.
Tesla really deserves some kudos for pushing the 48V architecture and the Ethernet-based communication. It drastically simplifies the wiring mess that is in a typical car. And it's not even close. Just watch the teardown of Cybertruck and compare its wiring to something like F150.
That said, it all seems like inside baseball to me. The BMW 850i pioneered the CAN bus, but that car was forgettable and although CAN bus took over the car industry that did not seem to create any durable advantages for BMW.
Ethernet seems like the inevitable replacement for CAN, in light of VW's investment in Rivian, and 48V vs. 12V for the low-voltage systems seems like a wash.
Earlier quoted context omitted.
> Tesla really deserves some kudos for pushing the 48V architecture and the Ethernet-based communication. For the record, 42V systems were experimented with in the 1990s: * https://en.wikipedia.org/wiki/42-volt_electrical_system In the 2011 German automakers agreed to 48V as the next step after 12V: * https://en.wikipedia.org/wiki/48-volt_electrical_system BMW was the first the first with Ethernet: * https://www.marv…
This has been a real head-scratcher for me. BMW and other automakers could have vastly improved their cars by switching to 48V a decade ago, but they still keep just plodding along with 12V. I have no explanation for this.
Tesla didn't have any existing, so their clean-slate math was clearly in favor of 100% new technology.
(Well, they did have 12v existing in their other cars, but they were clean-slate in the truck.)
Tesla really deserves some kudos for pushing the 48V architecture and the Ethernet-based communication. It drastically simplifies the wiring mess that is in a typical car. And it's not even close. Just watch the teardown of Cybertruck and compare its wiring to something like F150.
We can simplify the wire mess today by using more CAN bus devices. What is ethernet bringing to the picture?
They can probably develop for a car ethernet lan with a desktop pc and car "peripherals".
Not that there aren't canbus cards for pcs, but still.
Earlier quoted context omitted.
> Tesla really deserves some kudos for pushing the 48V architecture and the Ethernet-based communication. For the record, 42V systems were experimented with in the 1990s: * https://en.wikipedia.org/wiki/42-volt_electrical_system In the 2011 German automakers agreed to 48V as the next step after 12V: * https://en.wikipedia.org/wiki/48-volt_electrical_system BMW was the first the first with Ethernet: * https://www.marv…
This has been a real head-scratcher for me. BMW and other automakers could have vastly improved their cars by switching to 48V a decade ago, but they still keep just plodding along with 12V. I have no explanation for this.
Earlier quoted context omitted.
That must be only the high voltage connections, right?
These are talking about 48V, so my guess is it's for all the little bits (window motors, wipers, all the internal electronics, switches, turn signal lights, etc etc)