|
|
|
|
|
|
by extrapickles
1376 days ago
|
|
|
I could not find anything that would prevent this in my brief skim of FVMSS 105 (US car brake regulations). The regulations are mainly about the performance of the braking system (eg: needs to stop car 10x from 60mph in under a specific distance) and only care a little about the specific technique. You should see what you propose on cheap cars if motor pricing becomes less than the cost of regular hydraulic brakes. FVMSS 105: https://www.govinfo.gov/content/pkg/CFR-2011-title49-vol6/pd... |
|
|
What is a "service brake"? Notice that the regulation you linked to includes requirements for EVs that have braking regeneration as a component of their "service brake".
It turns out that the top-level of FVMSS [1] says that "service brake means the primary mechanism designed to stop a motor vehicle."
So I think you are exactly right. There is nothing in the law that says you can't use a 100% brake regen system in an EV. It just has to work and meet the performance standards (and perform regen on all wheels). But I'd guess that you aren't going to see the traditional brake system disappear unless it starts getting in the way. They don't cost a lot (relative to the price of the car), don't weigh a lot, are really reliable, and work really well.
[1] https://www.ecfr.gov/current/title-49/subtitle-B/chapter-V/p...