Mitsubishi Outlander PHEV Forum

It is currently Sat Nov 17, 2018 9:58 pm

All times are UTC - 8 hours [ DST ]




Post new topic Reply to topic  [ 38 posts ]  Go to page Previous  1, 2, 3, 4  Next
Author Message
 Post subject: Re: Unexpected lack of regen braking
PostPosted: Sat Nov 25, 2017 10:10 am 
Offline

Joined: Wed Nov 22, 2017 12:36 am
Posts: 155
Location: Austria
ChrisMiller wrote:
I do live near the top of a hill - but we're not talking Zugspitz, it's about 1.5 km at 15% gradient, with the same again up the opposite side of the valley. When the car is (normally) fully charged, even B5 can't prevent it accelerating down the hill. But returning home with a depleted battery, B5 is more than sufficient to hold the speed (there's a 50 mph limit, so I can play with the regen settings to maintain the appropriate speed, and gain a mile or two of charge as well).


You might "simulate" a hill top loading function by loading in a time slot that is preset too short for reaching full capacity.


Top
 Profile  
 
 Post subject: Re: Unexpected lack of regen braking
PostPosted: Sat Nov 25, 2017 10:36 am 
Offline

Joined: Tue Jan 12, 2016 6:37 am
Posts: 418
Location: Bucks
Thanks Harald. I don't have any problem, I've learnt to live with my little hill. There's no chance that the disc brakes won't be able to handle such a relatively short descent.

If I'm heading eastwards, I can run along the ridge for about 4 miles and only then have to descend. By that point, the battery has depleted sufficiently for almost full levels of regen braking to be available. And I can reach the bottom of the hill with almost the same range as when I left my house.

_________________
GX4h (2016) since 23/12/2015


Top
 Profile  
 
 Post subject: Re: Unexpected lack of regen braking
PostPosted: Sat Nov 25, 2017 1:36 pm 
Offline

Joined: Wed Nov 22, 2017 12:36 am
Posts: 155
Location: Austria
ChrisMiller wrote:
If I'm heading eastwards, I can run along the ridge for about 4 miles and only then have to descend. By that point, the battery has depleted sufficiently for almost full levels of regen braking to be available. And I can reach the bottom of the hill with almost the same range as when I left my house.


I just did a short calculation for the energy that can be harvested when driving down a 2000 kg vehicle for a 200 m altitude difference.
This is approx. 1 kWh and fits perfectly to your "almost full again" description after 4 miles along the ridge.

1000 meter in altitude difference can be sufficient for charging the battery by max. 50% of its capacity.


Top
 Profile  
 
 Post subject: Re: Unexpected lack of regen braking
PostPosted: Sat Nov 25, 2017 4:15 pm 
Offline

Joined: Tue Jan 12, 2016 6:37 am
Posts: 418
Location: Bucks
Thanks again, Harald! Not much chance of a 1,000 m descent in England :D

When I'm returning, I often go down the opposite side of the valley, and that adds 1 or 2 miles to the range indicator. If we assume 1.5 miles, that (at 3 miles/kWh) equates to 0.5 kWh. Which gives a reasonable efficiency of ~50% for regeneration.

_________________
GX4h (2016) since 23/12/2015


Top
 Profile  
 
 Post subject: Re: Unexpected lack of regen braking
PostPosted: Sun Nov 26, 2017 4:02 am 
Offline

Joined: Thu May 22, 2014 9:07 am
Posts: 541
Location: N Yorks, UK
I don't think mine is necessarily related to stopping a charge. Yet I am also feeling my regen isn't working properly. Even with a pretty much empty battery I find it works to an extent to b3 but b4 and b5 don't seem to add anything. I really needed it on a steep descent with s trailer on ice today! Could it be anything to do with freezing temperatures?
Thanks

_________________
Outlander PHEV GX4H in blue from 25 June 2014

Image


Top
 Profile  
 
 Post subject: Re: Unexpected lack of regen braking
PostPosted: Wed Dec 06, 2017 10:17 am 
Offline

Joined: Mon May 08, 2017 3:01 am
Posts: 50
Location: West Sussex England
ChrisMiller wrote:
I do live near the top of a hill - but we're not talking Zugspitz, it's about 1.5 km at 15% gradient, with the same again up the opposite side of the valley. When the car is (normally) fully charged, even B5 can't prevent it accelerating down the hill. But returning home with a depleted battery, B5 is more than sufficient to hold the speed (there's a 50 mph limit, so I can play with the regen settings to maintain the appropriate speed, and gain a mile or two of charge as well).



Aren't you going uphill on the way home?


Top
 Profile  
 
 Post subject: Re: Unexpected lack of regen braking
PostPosted: Wed Dec 06, 2017 10:24 am 
Offline

Joined: Tue Jan 12, 2016 6:37 am
Posts: 418
Location: Bucks
ChrisMiller wrote:
I do live near the top of a hill - but we're not talking Zugspitz, it's about 1.5 km at 15% gradient, with the same again up the opposite side of the valley.

_________________
GX4h (2016) since 23/12/2015


Top
 Profile  
 
 Post subject: Re: Unexpected lack of regen braking
PostPosted: Wed Dec 06, 2017 12:50 pm 
Offline

Joined: Wed Oct 29, 2014 8:23 pm
Posts: 285
Location: Dee Why
ChrisMiller wrote:
I do live near the top of a hill - but we're not talking Zugspitz, it's about 1.5 km at 15% gradient, with the same again up the opposite side of the valley. When the car is (normally) fully charged, even B5 can't prevent it accelerating down the hill. But returning home with a depleted battery, B5 is more than sufficient to hold the speed (there's a 50 mph limit, so I can play with the regen settings to maintain the appropriate speed, and gain a mile or two of charge as well).


Actually... I just put the thing in B5 by flicking the gearshift back twice and then use the accelerator pedal to maintain speed... easier than fiddling with the paddles....................


Top
 Profile  
 
 Post subject: Re: Unexpected lack of regen braking
PostPosted: Sat Dec 30, 2017 10:37 am 
Offline

Joined: Wed Nov 22, 2017 12:36 am
Posts: 155
Location: Austria
Not sure if this has already been discussed:

If regeneration is set to less than B5, what happens if the brake pedal is used?
Does the car automatically increase regeneration as it logically should do?

Did anybody check this already by surveying OBD2 data?


Top
 Profile  
 
 Post subject: Re: Unexpected lack of regen braking
PostPosted: Sat Dec 30, 2017 11:21 am 
Offline

Joined: Mon Dec 01, 2014 11:30 am
Posts: 3188
Location: Netherlands, Utrecht area
Harald wrote:
If regeneration is set to less than B5, what happens if the brake pedal is used?
Does the car automatically increase regeneration as it logically should do?
Yes, it does. But it does so in B5 as well. But in lower levels it does not do it to the same extend as it does in B5. This is why I have always said / claimed that, when moving along with normal traffic, B5 would be more efficient than B-less-than-5.

Now that my battery is deteriorating (which may be a result of frequent use of B5) B5 + brake pedal regen level is not as much as it used to be. As if it is throttled in order to prevent further damage to the battery. These days I don't see much difference between various levels anymore. At least, not once the brake pedal is applied.
Harald wrote:
Did anybody check this already by surveying OBD2 data?
Hitting the brakes first increases regen level and only when that is not sufficient it applies the friction brakes. I know this from monitoring pressure in brake lines via OBD.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 38 posts ]  Go to page Previous  1, 2, 3, 4  Next

All times are UTC - 8 hours [ DST ]


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
© Mitsubishi Outlander PHEV Forum - part of the MyElectricCarForums.com Group