MLucas
Posts: 833
Joined: Thu Jun 07, 2012 8:52 am
Location: Niagara on the Lake, Ontario, Canada

Re: B-mode for regular driving

Mon Mar 04, 2013 8:00 am

I know there is a lot of complaints about the shifter, but if you give it half a chance its not so bad. I no longer need to look down or at the power meter to see what 'setting' I'm in - I can just feel it. Much like a stick shift. The shifter is actually well designed and the notchy interface helps with the 'no-look' scenario. I found just pushing and pulling the lever is all that is needed to move the selector. Moving the lever to the left wastes time and may cause the lever to move into R or P - probably not something we should do when moving. The pushing/pulling method keeps from going into the wrong selection and helps with 'feeling' for the necessary setting.

Like Dylan...I went electric.

  • Purchased: June 29th, 2012
  • Mileage on June 29th, 2013 - 25,431 km / 15,802 miles
  • Mileage on June 29th, 2014 - 51,286 km / 32,616 miles

List of Oil Spills: http://en.wikipedia.org/wiki/List_of_oil_spills

fjpod
Posts: 529
Joined: Tue Apr 17, 2012 2:31 am
Location: NYC

Re: B-mode for regular driving

Mon Mar 04, 2013 5:21 pm

remember...whether you slow down by pressing on the brake pedal, or use E or B, you are getting the same thing...a relatively fixed amount of regen. You don't necessarily get "better" regen using B compared to the brake pedal if applied slowly. There is some evidence that the longer you take to slow down, the better the regen will be. So, traffic permitting, a long slowdown with E is probably better than slamming on the brake pedal.

But as I and others have said before, the best way to get the best mpg is to not need to use regen at all.

Llecentaur
Posts: 240
Joined: Thu Dec 27, 2012 7:56 am

N vs driving in "neutral" power position

Thu Mar 07, 2013 5:58 am

I think I got the reason why I was getting better results coasting in N than keeping the regen arrow in neutral position.

The test was done with the heating on, therefore the neutral position I was aiming for was really a slight regen to compensate heater's usage.

Tried the same without the heating and results are pretty equivalent to N. I must admit that it takes some training to get this right, specially that I have the impression that the czero's N is probably equivalent to iMiev' B.

tonymil
Posts: 274
Joined: Mon Apr 16, 2012 6:50 am
Location: Latham, NY

Re: B-mode for regular driving

Thu Mar 07, 2013 7:20 am

The best method of stopping/slowing down is the method that uses the brake pads the least. For me, that means choosing between E mode and B mode depending on the situation. I know some here use the early part of the brake pedal to engage regen before engaging the brake pads, but I have found the E/B mode options meet my needs. I've gotten very used to deciding in an instant which mode to use when I'm forced to slow down or stop and only rarely do I find that I've slowed down too much, too soon and need to tap the accelerator or that I've slowed down to little, too late and need to tap the brake earlier than I wanted. I've also noticed that whatever mode your in, regen stops when you reach about 9 mph. At that point the car acts like any gas car and is slowed by friction or keeps going if you're on a downslope. As for coasting, well doesn't that just mean maintaining your speed and not accelerating when you're on a downslope? I find it easy enough to do that by adjusting the pressure on the accelerator rather than popping into neutral. And on severe downslopes, B mode is perfect for maintaining speed while using regen.

I really think it comes down to personal preference as to which mode you use for driving and slowing down, as long as you're not using the brake before you get to 9 mph you're getting maximum regen and I think maximum range.

peterdambier
Posts: 284
Joined: Thu Oct 04, 2012 3:26 am
Location: Bergstrasse, Germany

Re: B-mode for regular driving

Thu Mar 07, 2013 1:49 pm

Although motors, generators and batteries may come close to 90% I'd rather expect with battery, motor, gear, wheels of rubber on tarmac we are happy to see 60%. Regen again will be no better than those 60% but now we have got only 30% left. So we wont get more than one third back of the power we lost breaking. Actual numbers are even smaller. Dont expect wonders.

Still, driving over the hill and down the other side I do reach the bottom with batteries filled to the rim after some 10 kilometers of driving. Getting home again takes me some 3 to 4 bars.

If we can go without breaking that will give us most kilometers. If we do have to use the breaks because of speed limits or traffic lights then regen does help us.
Peter and Karin Dambier, DL2FBA, www.piraten-fraktion-bergstrasse.de

Don
Site Moderator
Posts: 2942
Joined: Thu May 10, 2012 3:55 pm
Location: Biloxi MS

Re: B-mode for regular driving

Fri Mar 08, 2013 5:03 pm

tonymil wrote:I've also noticed that whatever mode your in, regen stops when you reach about 9 mph.
I think this is due to the 'creep mode' they stuck us with trying to emulate the action of an ICE with an auto trans - When you get below a certain speed, the regen stops because the motor is being fed a voltage at that point. I'd surely disable this if I was a programmer - I sure don't understand the need for the motor trying to move the car until I press hard on the brake pedal. It should quit using juice as soon as I release the accelerator, IMO - It doesn't need to keep trying to creep forward unless I direct it to!!

As for coasting, well doesn't that just mean maintaining your speed and not accelerating when you're on a downslope? I find it easy enough to do that by adjusting the pressure on the accelerator rather than popping into neutral. And on severe downslopes, B mode is perfect for maintaining speed while using regen
Yes, 'coasting' to me is the car moving without using any energy and I can easily do that just by modulating the pedal. Using 'B' mode, I can easily 'adjust' my 'coasting' to speed up just a touch or slow down just a bit when needed. I never shift to neutral

I really think it comes down to personal preference as to which mode you use for driving and slowing down, as long as you're not using the brake before you get to 9 mph you're getting maximum regen and I think maximum range.
Agreed - What works so well for me may not be ideal for everyone. I am so used to manual transmission cars (they're all I've ever owned over the past 50 years) that I don't have any ICE auto trans bad habits. For those who have never owned a manual trans vehicle, driving the iMiEV the way I do would probably take lots more concentrationthn they would be comfortable with, while for me it's completely second nature :D

Don
2012 iMiEV SE Premium, White
2012 iMiEV SE Premium, Raspberry Metallic
2012 iMiEV SE, White
2017 Chevy Volt Premier
2014 Ford Transit Connect XLT SWB wagon

jennrod12
Posts: 230
Joined: Sat Feb 11, 2012 8:51 pm
Location: Santa Clara, CA

Re: B-mode for regular driving

Fri Mar 08, 2013 5:34 pm

I usually stay out of B because I'm usually driving in rush-hour traffic. With B it's so easy to do one-pedal driving that I worry about not showing brake lights when slowing down.

I find that the one-pedal driving is so natural that I don't think about the brake-light issue and that could be bad news for me!

Jenn
2012 Diamond White i-MiEV ES
with green racing stripes and hubcaps (thanks to WeeJohn)
Santa Clara, CA

Don
Site Moderator
Posts: 2942
Joined: Thu May 10, 2012 3:55 pm
Location: Biloxi MS

Re: B-mode for regular driving

Fri Mar 08, 2013 6:18 pm

Yes, I wish we had the option to have the third brake light pulse once per second whenever the car is in regen mode . . . . not sure how legal that would be in all 50 states though. I know they make brake flasher units for use on motorcycles . . . . wonder how hard it would be to install one of those triggered by the regen?

Driving a manual trans, I almost always slow by downshifting anyway, so I'm used to not having brake lights showing when I'm slowing, so this car is no different. I'm always keeping an eye on the mirrors too . . . . a habit I got into riding motorcycles

I owned a Toyota Supra once with a 5 speed - Transferred it over to my son when I had about 150K on it . . . . he sold it when it had about 175K on it and it still had the factory brakes on it then - I had never even replaced the brake pads!

Don
2012 iMiEV SE Premium, White
2012 iMiEV SE Premium, Raspberry Metallic
2012 iMiEV SE, White
2017 Chevy Volt Premier
2014 Ford Transit Connect XLT SWB wagon

Zelenec
Posts: 265
Joined: Sun Feb 17, 2013 12:21 am
Location: sLOVEnia
Contact: Website

Re: B-mode for regular driving

Sat Mar 09, 2013 12:50 am

And you certainly wont on I-miev :)
Tired of smelly garage - switched to EV in 2012!
Zelenec = Greeny, Treehugger, Ecofan
www.mojev.si

gatedad11
Posts: 95
Joined: Fri Jan 18, 2013 7:41 am
Location: Bucks County, PA

Re: B-mode for regular driving

Fri Mar 15, 2013 11:56 am

Interesting topic. Now that I have had the I for about 6 weeks, I have started to really experiment with the different modes. This week, I tried using "B" for anytime that I need to accelerate the car forward, then once I see an impending stop, switch to "N" and finally take my foot off of the brake. I cannot always do this, the terrain as well as traffic will sometimes make it impractical to drive like this. However, I can say that I was genuinely surprised by just how smoothly the car goes in neutral. In fact, it seems to accelerate when I switch from B to N. On any kind of downslope where I can coast without causing disruptions to the traffic flow, I do it. At this point I cannot say yeah or nay on whether it is better than all "E"(my previous mode), but it seems to extend the range. How much, I can't say with certainity, but it sure "seems" like it might be a good way to conserve range and still have a plesasant drive.

Lou

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