lurch when braking
#2
Re: lurch when braking
At a certain point, the electric motor will stop trying to regen and all your braking will be done by the friction brakes. You can see your CHRG bar disappear right before you come to a stop.
#4
Re: lurch when braking
I've found that once the car warms-up enough for auto-stop to start working, this "lurching" no longer occurs. However, until that happens, it is really an annoying problem (and obviously somewhat dangerous).
#5
Re: lurch when braking
Originally Posted by sparksongs
...it is really an annoying problem (and obviously somewhat dangerous).
#6
Re: lurch when braking
Yeup keep in mind there are points where hitting the brakes doesn't translate to your actual brakes clamping down on your rotor (or shoe in drum), the car's engine and electric regen mode are slowing you down. When this gets negated at slower (near stop speed) then your real brakes do the braking... so the lurch is the transistion between the engine stopping you to know the brakes having to make up the difference.... hence you have to put more pressure on the brakes.
#7
Re: lurch when braking
Originally Posted by subnivean
I don't know about dangerous - the only time it does this 'mode shifting' between regen braking and friction braking is when you're decelerating relatively slowly. I'm sure that if you really stomp on the break pedal, the car's computer will take note and tell the battery 'Whoa! Gotta stop *NOW*! No regen for you!" and go right to the friction brakes.
#8
Re: lurch when braking
Originally Posted by ElanC
It's not an either-or situation. Regen alone is used as long as it provides enough braking power. If you press harder on the brake pedal, you get the addition of the conventional brakes, but regen doesn't stop. Regen is stopped when the vehicle is moving so slowly that the electric motor, working as a generator, can no longer utilize a significant amount of torque.
Anyway, I was talking about stomping on the brakes so hard that the wheels lock up immediately and the ABS kicks in. In that case, if there is indeed any regen still going on, I doubt you would feel any 'lurch' in the braking due to the regen/friction brake split. That seemed to be the implication of the post I originally replied to - that this 'lurch' was some fault in the braking system that might make it hard to stop. I was just saying if you *really* want the car to stop, and stop quickly, it will stop quickly.
Last edited by subnivean; 02-01-2006 at 03:52 PM.
#9
Re: lurch when braking
Originally Posted by subnivean
I'm talking about stomping on the brakes so hard that the wheels lock up immediately and the ABS kicks in. In that case, if there is indeed any regen still going on, I doubt you would feel any 'lurch' as the regen stopped. That seemed to be the implication of the post I originally replied to - that this 'lurch' was some fault in the braking system that might make it hard to stop. I was just saying if you *really* want the car to stop, and stop quickly, it will stop quickly.
Last edited by tbaleno; 02-01-2006 at 04:23 PM. Reason: fixed spelling
#10
Re: lurch when braking
Originally Posted by ElanC
Yeah, sure it will. The problem is not that severe. But when you're slowing down to a top light, and there's a car stopped in front of you, and suddenly when you're ten feet away and almost stopped the brakes go to half-power, you might just hit the car in front of you if you're not paying close attention.