3 ms·

The vacuum reservoir of the brake booster in cars with vacuum servo brakes (whether vacuum is generated by the engine or an electric pump is irrelevant) stores

The vacuum reservoir of the brake booster in cars with vacuum servo brakes (whether vacuum is generated by the engine or an electric pump is irrelevant) stores enough energy for 3-4 full applications of the brakes.

avianlyric 1y ago
EV don’t use vacuum break booster systems anymore. There are much better and more efficient fully electric break booster systems out there which make a lot more sense. Vacuum break boosters only make sense for ICE vehicles where you already have an existing air pump (the actual engine) providing free “vacuum”, they don’t make sense in EVs where you need to an extra dedicated motor to produce vacuum, to power a vacuum booster system, to boost the breaks. Much better off just using the extra electric motor to directly boost breaks, without the whole vacuum system as a middle man. Early EVs use vacuum break boosters, but only because they were the only economical solution, given there was little demand for electric break booster systems. After all a vacuum system is cheaper, if you have a free “vacuum source”. But for last decade or so there’s been enough EVs manufactured that electric break booster systems are now more economical for EVs. To answer GP question, the an electric break booster system is almost certainly powered off the low voltage (12V) accessory system, not the high voltage system. So a high voltage disconnect won’t prevent the break booster from working, assuming the LV battery is working correctly.
- bryanlarsen 1y ago
  That's not reassuring. This recall is the exception. The low voltage 12V battery has been far more unreliable in EV's from all brands than the high voltage battery has been. Is an EV like an ICE in that the 12V bus has power while the car is running even if the 12V battery is dead? In an ICE the alternator puts 13.5 volts onto the 12V bus so a dead battery will prevent a car from starting but it will stay running on a dead battery if boosted to start. I imagine an EV does something similar but I don't know.
  - stetrain 1y ago
    If the car is on (high voltage battery pack energized) then there is 12V supplied from the high voltage pack through a DC to DC converter. The 12V battery dying is only an issue if the car is parked and the high voltage battery is disconnected. Then there may not be enough power to 'wake' the car up again.
  - vel0city 1y ago
    In a lot of EVs, when the car is "on" there is a DC/DC converter powering the 12V system from the HV battery. So if the car was "on" and experienced a loss of the 12V battery it could continue operating for some period of time.
    - grayfaced 1y ago
      I think the implication is that people could be driving with a dead 12V as if nothing is wrong. Then when they experience the HV failure in the recall, they would have no power whatsoever for safety systems.
      - bryanlarsen 1y ago
        That wasn't intended to be my implication. The replies to the original comment answered my question. Generally if you have a dead 12V you know it because you need a boost to get started, and you don't drive like that for long. I'm not worried about a cascade failure, I was worried about the 12V dying while somebody was driving and then having no brakes. That concern has been addressed.
      - addaon 1y ago
        Yes, this drives a requirement for latent fault detection of LV battery faults. In general when a safety function is decomposed to provide statistical safety, there is a requirement to time-bound a single failure, since without that the decomposition doesn’t buy you anything. Latent fault detection is the standard option for time bounding for automotive — for aviation, you have a second escape hatch that issues that are reliably found during annual / 100 hour inspection and can be safely missed for that long can be caught by inspection instead.
- pengaru 1y ago
  > EV don’t use vacuum break booster systems anymore. There are much better and more efficient fully electric break booster systems out there which make a lot more sense. To lecture us on EV brake systems while repeatedly misspelling the word is making me twitch far too early this otherwise fine Wednesday morning.
- dzhiurgis 1y ago
  There's speculation that move to unboxed manufacturing process is going to ditch hydraulics altogether (can't easily connect hydraulics in such process) and use electric actuators for brake pads.
diabeetusman 1y ago
It's 3 years old, but this video [1] goes over Tesla's electric brake booster (and its lack of vacuum) [1]: https://www.youtube.com/watch?v=SRZ8XDNz2vU https://www.youtube.com/watch?v=SRZ8XDNz2vU
- runlevel1 1y ago
  Well that was more entertaining than I was expecting...

avianlyric 1y ago

EV don’t use vacuum break booster systems anymore. There are much better and more efficient fully electric break booster systems out there which make a lot more sense. Vacuum break boosters only make sense for ICE vehicles where you already have an existing air pump (the actual engine) providing free “vacuum”, they don’t make sense in EVs where you need to an extra dedicated motor to produce vacuum, to power a vacuum booster system, to boost the breaks. Much better off just using the extra electric motor to directly boost breaks, without the whole vacuum system as a middle man. Early EVs use vacuum break boosters, but only because they were the only economical solution, given there was little demand for electric break booster systems. After all a vacuum system is cheaper, if you have a free “vacuum source”. But for last decade or so there’s been enough EVs manufactured that electric break booster systems are now more economical for EVs. To answer GP question, the an electric break booster system is almost certainly powered off the low voltage (12V) accessory system, not the high voltage system. So a high voltage disconnect won’t prevent the break booster from working, assuming the LV battery is working correctly.

bryanlarsen 1y ago
That's not reassuring. This recall is the exception. The low voltage 12V battery has been far more unreliable in EV's from all brands than the high voltage battery has been. Is an EV like an ICE in that the 12V bus has power while the car is running even if the 12V battery is dead? In an ICE the alternator puts 13.5 volts onto the 12V bus so a dead battery will prevent a car from starting but it will stay running on a dead battery if boosted to start. I imagine an EV does something similar but I don't know.
- stetrain 1y ago
  If the car is on (high voltage battery pack energized) then there is 12V supplied from the high voltage pack through a DC to DC converter. The 12V battery dying is only an issue if the car is parked and the high voltage battery is disconnected. Then there may not be enough power to 'wake' the car up again.
- vel0city 1y ago
  In a lot of EVs, when the car is "on" there is a DC/DC converter powering the 12V system from the HV battery. So if the car was "on" and experienced a loss of the 12V battery it could continue operating for some period of time.
  - grayfaced 1y ago
    I think the implication is that people could be driving with a dead 12V as if nothing is wrong. Then when they experience the HV failure in the recall, they would have no power whatsoever for safety systems.
    - bryanlarsen 1y ago
      That wasn't intended to be my implication. The replies to the original comment answered my question. Generally if you have a dead 12V you know it because you need a boost to get started, and you don't drive like that for long. I'm not worried about a cascade failure, I was worried about the 12V dying while somebody was driving and then having no brakes. That concern has been addressed.
    - addaon 1y ago
      Yes, this drives a requirement for latent fault detection of LV battery faults. In general when a safety function is decomposed to provide statistical safety, there is a requirement to time-bound a single failure, since without that the decomposition doesn’t buy you anything. Latent fault detection is the standard option for time bounding for automotive — for aviation, you have a second escape hatch that issues that are reliably found during annual / 100 hour inspection and can be safely missed for that long can be caught by inspection instead.
pengaru 1y ago
> EV don’t use vacuum break booster systems anymore. There are much better and more efficient fully electric break booster systems out there which make a lot more sense. To lecture us on EV brake systems while repeatedly misspelling the word is making me twitch far too early this otherwise fine Wednesday morning.
dzhiurgis 1y ago
There's speculation that move to unboxed manufacturing process is going to ditch hydraulics altogether (can't easily connect hydraulics in such process) and use electric actuators for brake pads.

diabeetusman 1y ago

It's 3 years old, but this video [1] goes over Tesla's electric brake booster (and its lack of vacuum) [1]: https://www.youtube.com/watch?v=SRZ8XDNz2vU https://www.youtube.com/watch?v=SRZ8XDNz2vU

runlevel1 1y ago
Well that was more entertaining than I was expecting...