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Post by ravolt on Mar 3, 2014 10:57:11 GMT 11
Is my assumption fair? When the power meter exceeds the -30kW on braking then the brake pads touch? I suspect it isn't as simple as that. One article I found suggested that the pads go on initially. To overcome this if you apply brake harder initially, then ease off, the pads will lift away and pure regen occurs.
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Post by riddick on Mar 3, 2014 11:11:37 GMT 11
This is an excellent topic.
My suspicion is similar. When I brake, I try not to send regen beyond 30kW.
I think if you break very hard then the pads will have to kick in as the car has to do its best to stop. I have noticed the with hard braking, regen can be very poor.
I thought that if you break lightly then it can be pure regen. But it makes sense for the pads to get ready as soon as you start braking as it cannot afford to waste time trying to stop.
Another strategy I use is to but the car in ECO mode when I see a red light up front. So I may be switching in/ out of ECO mode while driving.
Do you have a link to that article?
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Post by Jim Hare on Mar 3, 2014 13:49:01 GMT 11
With hard braking there is pretty much zero regen as the car assumes you are in a hurry to stop so doesn't mess around.
Could be that it's the same over -30kW as you are continuing to apply the brake so it gives up on regen and stops the car before you crash.
I imagine they would have argued back and forth quite a bit between regen and safety, and my guess is safety won each time.
But no facts in my post, 100% speculation on my part.
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Post by ravolt on Mar 3, 2014 14:03:00 GMT 11
My understanding is the ECO's more "aggressive" regeneration, by lifting off the pedal and no braking, is a known pure regen. When one brakes though it is a different scenario. I did discover this video of Max regen - at what point do mechanical brakes engage? with a previous post. Curiously and understandably with all the losses (rolling resistance, air resistance) the best achievable recovery is 39% of kinetic energy. Suggesting not a gentle slowing but a more aggressive application to enforce a near 30kW regeneration maintaining that for as long is practicable. This would minimise exposure to the losses. Comments anyone? |
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Deleted
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Post by Deleted on Mar 4, 2014 10:17:05 GMT 11
on the volt I find that I have to press more firmly I have gone over the stop line at traffic lights at least 5x with the volt. haven't come across this brake feel before on other cars. some might consider the volt's brakes to be spongy / mushy pumping the brake pedal, the pedal goes down another 5-10mm. there is also a vibration or pulsing that occurs; this is when the car is stationary, so not necessarily related to ABS. this doesn't happen on the imiev. forums.aeva.asn.au/forums/spongy-brakes_topic3918.html |
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Post by mike on May 12, 2014 20:48:50 GMT 11
In traffic, I use the ECO mode to get a "deadman" pedal response, which is much more natural than going back and forth between the accelerator and brake. One question that comes to mind is ..."Does the brake lights illuminate when at hard regen in ECO?" ECO mode is great for traffic driving comfort, but not at the risk of getting rear-ended by the guy behind texting on his phone watching only for a brake light in his peripheral vision.
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Post by Jim Hare on May 13, 2014 9:58:09 GMT 11
I haven't tested it but my guess is the brake lights will only come on if your foot is pressing the brake. The regen does improve quite a bit when you push the brake slightly.
What I do in traffic is just use the accelerator when managing my speed, but when approaching a red light or stopped traffic I slightly push the brake to let cars behind me know I'm coming to a stop.
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Post by riddick on May 13, 2014 21:17:43 GMT 11
I do the same as Mike (drive in D and slow in ECO for the lights) and I was also concerned about the brake lights not being on, so I watch my rear. If someone is approaching too fast, then I momentarily touch the brake.
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Post by Phoebe on May 13, 2014 21:34:08 GMT 11
I drive in Eco all the time and no-one has ever looked like running into me when I'm slowing down, as I usually do that very slowly. If I need to slow down in a hurry I use my brakes and the lights come on anyway.
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carnut1100
EV Tyre Kicker
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Post by carnut1100 on Jun 30, 2014 20:45:31 GMT 11
When I drive a manual car I use the gears and engine braking to slow down anyway. I have never had anybody run into the back of me.
In my imiev I drive it in B mode all the time. Likewise I have never had a problem.
I wouldn't worry...
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