48 V has been used in cars since ~2017, it came eith the introduction of mild hybrid gasoline cars. The auxilary e-motor is 48 V and also 48 V battery. In EVs in 2019 Porsche Taycan introduced 48 V for PDCC - Porsche Dynamic Chassis Control.
Allow me to explain this. Power loss = the resistance times the square of the current. For the same size wiring, if you quadruple the voltage, the current drops to a quarter and the power loss drops to a 1/16th (or much smaller wire can be used). A no-brainer to go to as high of a voltage as your insulation, semiconductor ratings, and safety standards allow (NEC code kicks in at 50volts or 60volts automotive). Biggest technical challenge I see is making a consumer level automotive produce have so much complexity that is becomes practically unserviceable.
200 watts to crank up a window? Or even 800 watts for a window? This is the performance of an immersion heater. Thinner cables? Today car manufacturers already use 0.5 sqmm cables in 12V systems. Even thinner cables would often break. Virtual battery? In the EU it is a requirement that the high-voltage battery can be separated via relays. One 12V battery is used to switch the relays. It could also be two 12V batteries for a 24V system, or four 12V batteries for a 48V system. But the starter battery cannot be dispensed with due to the regulations. Super Capacitors do not have the storage capacity of a lead-acid battery, much less than lithium batteries. The controllers in the car use 12V, but internally they work with 3.3 volts for the IC. VW is once again moving away from the zone controller concept for small cars. It is cheaper to combine central tasks in a central controller and pull cables instead of installing a separate controller for each small task. Autonomous vehicles. Who wants to drive a car controlled only by a computer? Who is liable if the computer makes errors? Autonomous trains are already rare, autonomous cars are an even more difficult task. High-speed Ethernet is rarely used in automobiles. The CAN bus system is used in the car. There are reasons for this that CAN bus is much more suitable for vehicles and that suppliers already offer CAN bus systems. Suppliers can offer a wide range of 12V systems or 24V systems such as those used in lagre trucks.
re: "Thinner cables? Today car manufacturers already use 0.5 sqmm cables in 12V systems. Even thinner cables would often break." exactly, where laymen are only able to see and focus on the idea of thinner wires, in reality what Engineers recognize is they must also focus on MECHANICAL DURABILITY, as there's exists a condition where you can actually have wires that are TOO THIN for a given application (true story). therein these kids have NO KNOWLEDGE of the time and costs to both OEM's and Dealers involved with replacing bad harnesses under WARRANTY. in their weak brains everything "magically" works PERFECT for 10 years/100,000 miles.
48 V has been used in cars since ~2017, it came eith the introduction of mild hybrid gasoline cars. The auxilary e-motor is 48 V and also 48 V battery.
In EVs in 2019 Porsche Taycan introduced 48 V for PDCC - Porsche Dynamic Chassis Control.
Allow me to explain this. Power loss = the resistance times the square of the current. For the same size wiring, if you quadruple the voltage, the current drops to a quarter and the power loss drops to a 1/16th (or much smaller wire can be used). A no-brainer to go to as high of a voltage as your insulation, semiconductor ratings, and safety standards allow (NEC code kicks in at 50volts or 60volts automotive). Biggest technical challenge I see is making a consumer level automotive produce have so much complexity that is becomes practically unserviceable.
Pls specify „unserviceable“ in more detail.
200 watts to crank up a window? Or even 800 watts for a window? This is the performance of an immersion heater.
Thinner cables? Today car manufacturers already use 0.5 sqmm cables in 12V systems. Even thinner cables would often break.
Virtual battery? In the EU it is a requirement that the high-voltage battery can be separated via relays.
One 12V battery is used to switch the relays. It could also be two 12V batteries for a 24V system, or four 12V batteries for a 48V system. But the starter battery cannot be dispensed with due to the regulations.
Super Capacitors do not have the storage capacity of a lead-acid battery, much less than lithium batteries.
The controllers in the car use 12V, but internally they work with 3.3 volts for the IC.
VW is once again moving away from the zone controller concept for small cars. It is cheaper to combine central tasks in a central controller and pull cables instead of installing a separate controller for each small task.
Autonomous vehicles. Who wants to drive a car controlled only by a computer?
Who is liable if the computer makes errors?
Autonomous trains are already rare, autonomous cars are an even more difficult task.
High-speed Ethernet is rarely used in automobiles. The CAN bus system is used in the car.
There are reasons for this that CAN bus is much more suitable for vehicles and that suppliers already offer CAN bus systems.
Suppliers can offer a wide range of 12V systems or 24V systems such as those used in lagre trucks.
Why should you use Ethernet with 4 pairs of wires
when CAN bus gets by with 1 pair of wires?
lol this guy knows his stuff
re: "Thinner cables? Today car manufacturers already use 0.5 sqmm cables in 12V systems. Even thinner cables would often break." exactly, where laymen are only able to see and focus on the idea of thinner wires, in reality what Engineers recognize is they must also focus on MECHANICAL DURABILITY, as there's exists a condition where you can actually have wires that are TOO THIN for a given application (true story). therein these kids have NO KNOWLEDGE of the time and costs to both OEM's and Dealers involved with replacing bad harnesses under WARRANTY. in their weak brains everything "magically" works PERFECT for 10 years/100,000 miles.
Why limit it to EV? Why not include ICE vehicles ancillary power distribution?
Because ICE is already obsolete.