It says, "Usually, electromagnetic brakes require a constant power
supply to be held open." It seems they presume that most EV
manufacturers are using some sort of electromagnetic brake, where the
brake is tensioned to the closed position with a spring and held open
with an electromagnet. (I guess if there's a brake system failure,
you'll have full-on braking.)
If this is what manufacturers are doing - which seems unlikely - then
something that doesn't use constant power while not braking would help.
But the invention sounds risky. Now, if the system fails, the brake is
locked open. They must have some sort of override, but it isn't
explained.
I would think that most EVs have cable brakes. That way, the brake
pedal, when pushed far enough, could always pull the mechanical cable
and override any electronic systems. And I can imagine hooking up a
servo to the cable system (or an alternate system) to mesh mechanical
braking with regen. No power used in the braking system while not
braking.
Peri
------ Original Message ------
From: "Willie via EV" <[email protected]>
To: [email protected]
Cc: "Willie" <[email protected]>
Sent: 04-Mar-20 7:00:33 AM
Subject: Re: [EVDL] Bi-stable e-brake design extends EV's range
On 3/4/20 7:35 AM, Rod Hower via EV wrote:
Not sure how this can save much energy if you have regen. My 2014 Chevy Volt
has 95,000 miles and the brake pads are like new. The only time I use the
brakes is at the very end of stopping and holding the vehicle at a traffic
light so it doesn't creep forward.
I, too, am puzzled by what possible benefit this "break through" might offer.
Maybe someone will explain to me.
However, I'm not certain that regen will bring a car to a stop. I agree that Teslas,
Bolts, and Volts will come to a stop without the use of the brake pedal. I suspect that
the cars are applying brakes at lower speeds and the "throttle" is off.
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