[sjb993]

Does anyone know if any of the current 3/4 Series cars have the 2nd Generation MHT (i.e. 48v motor/generator in-line with the transmission)? If so, which?

TIA.

[alFR]

AFAIK the current models have the 48V starter motor assist system that connects to the belt drive, the new version comes in with the B58TU2 engine which I think came in with the X7 LCI and hasn't made it to the 3 series yet. MY2025 maybe?

[The_Tok'Ra]

Yes, AFAIK, all the current 3/4 series cars, including the LCI models have a 48v 10Ah MHT battery up front, under the bonnet. This new 20Ah based system with the battery at the rear has only been seen on the LCI X7

[bmnut]

You're right! Mine's definitely in the engine bay because I tend to clean/dry around it when I've jet washed the car....bloody water gets everywhere!

[paulockenden]

The 330e has something similar to the new MHT, with the electric motor in the gearbox. A bigger, higher voltage battery of course, but the arrangement is similar.

[sjb993]

Originally Posted by paulockenden

The 330e has something similar to the new MHT, with the electric motor in the gearbox. A bigger, higher voltage battery of course, but the arrangement is similar.

Thanks for all the responses.

WRT the 330e, as the electric motor is in-line with the transmission, does it perform braking? I recently had an i4 as a loan car whilst the dealership took 3 weeks to find that an intermittent rear end knocking was being caused by a faulty adaptive shock absorber, and the motor braking in that was very noticeable. So much so that I wondered whether the brake lights are turned on when the electric motor is doing the braking.

[paulockenden]

Yes, the 330e uses the motor in reverse for braking, except in Eco Pro mode which is more geared towards coasting instead of regen. As a result most 330e have rusty brake discs!

[sjb993]

Let’s hope that the introduction of an electric motor/generator into the drivetrain doesn’t adversely affect the sublime combination of B58 and ZF8.

[225]

I have been pleasantly surprised by the mild hybrid set up on the m340. In certain conditions you can go quite far on electric mode and it really helps the start stop smoothness.

[MisterG]

I wonder if the new 5series (520i) has this, as it has slightly more electric assistance than the old model (13kw vs 8kw in the current MHT cars)

[Herr Gross Byte]

Originally Posted by 225

I have been pleasantly surprised by the mild hybrid set up on the m340. In certain conditions you can go quite far on electric mode and it really helps the start stop smoothness.

It is my understanding that the 11 HP electric motor doesn't have the ability to power the car alone. It's stop start only. So your 'on electric mode' AKA eco pro is coasting with the engine off? I ask because I'm not entirely sure and couldn't find much info online. I've often wondered if the electric engine alone can propel the car and came to the conclusion that it can't. It is used in various situations to supplement the ICE but it's not possible to drive on electric alone (M340i).

[bmnut]

Originally Posted by Herr Gross Byte

It is my understanding that the 11 HP electric motor doesn't have the ability to power the car. It's stop start only. So your 'on electric mode' AKA eco pro is coasting with the engine off? I ask because I'm not entirely sure and couldn't find much info online. I've often wondered if the electric engine alone can propel the car and came to the conclusion that it can't. It is used in various situations to supplement the ICE but it's not possible to drive on electric alone (M340i).

That is my understanding of how MHT works on my M440i.
As you say it takes the load off the engine when running ancillaries, controls the stop/start and allows coasting amongst other things. When the ‘Energy flow’ screen states ‘Electric motor assisting’ that means it’s using some or all of the available 11hp boost. There is no electric motor as such, unlike the ‘e’ models so cannot run as an electric vehicle. The ICE engine is always running but at times decoupled from the drivetrain. The only time the ICE is ‘off’ is when the stop/start feature is activated.

[sjb993]

Originally Posted by bmnut

That is my understanding of how MHT works on my M440i.
As you say it takes the load off the engine when running ancillaries, controls the stop/start and allows coasting amongst other things. When the ‘Energy flow’ screen states ‘Electric motor assisting’ that means it’s using some or all of the available 11hp boost. There is no electric motor as such, unlike the ‘e’ models so cannot run as an electric vehicle. The ICE engine is always running but at times decoupled from the drivetrain. The only time the ICE is ‘off’ is when the stop/start feature is activated.

That's interesting, when coasting in my 340i the ICE does stop - as shown by the rev. counter and "READY" being displayed in the drive mode indication.

[alFR]

Originally Posted by sjb993

That's interesting, when coasting in my 340i the ICE does stop - as shown by the rev. counter and "READY" being displayed in the drive mode indication.

That's what mine does as well. Agree that it doesn't ever seem to drive on electric-only, the engine restarts whenever the throttle gets pressed (even very gently). It's so smooth you can barely feel the start though.

[bmnut]

You’re both correct, it does do that, I should have explained it better! The ICE goes to ‘Ready’ state.

I’m putting it down to age…or at least that’s my excuse!

[bmnut]

Knew I had something on my Mac from a previous thread a while ago on here....this may help!

[rileyt]

I was under the impression that the pre-LCI G2x MHT cars have the belt based system and the LCI MHT cars have a version of the in-line motor in the gearbox solution. Or do I have that wrong?

[bmnut]

Originally Posted by rileyt

I was under the impression that the pre-LCI G2x MHT cars have the belt based system and the LCI MHT cars have a version of the in-line motor in the gearbox solution. Or do I have that wrong?

Pre-LCI like mine is belt based apparently...according to the diagrams and descriptions on the pdf attachment I put on my previous post.
No idea how that has changed on LCI vehicles.

[225]

Hmm maybe I'm imaging it then but I think there is a difference from coasting mode where it would naturally start slowing Vs engine disengaged but still feels like its being propelled. Not speeding up or like in a full hybrid but it doesn't slow down like if you had knocked it in to netural. As I posted not for long but I'm sure in certain circumstances it happens.

[Dave_3]

Originally Posted by 225

Hmm maybe I'm imaging it then but I think there is a difference from coasting mode where it would naturally start slowing Vs engine disengaged but still feels like its being propelled. Not speeding up or like in a full hybrid but it doesn't slow down like if you had knocked it in to netural. As I posted not for long but I'm sure in certain circumstances it happens.

Exactly what I suspect too. Your speed doesn't noticeably decay when engine is off and coasting. Partly which makes it so seamless in operation. You couldn't tell without seeing the "ready" text.

D.

[MisterG]

Originally Posted by rileyt

I was under the impression that the pre-LCI G2x MHT cars have the belt based system and the LCI MHT cars have a version of the in-line motor in the gearbox solution. Or do I have that wrong?

I’m not sure any BMW have the in-gearbox mild hybrid system yet.

Edit:
Looking at the limited tech specs…
The new 5 series, and x7 mild hybrids state they can add 200nm of torque… compared to 25nm of the 3 series.
So maybe they are the next gen ones.

[Herr Gross Byte]

Would make sense. I can't see them changing something that fundamental for a Facelift, which is by definition, cosmetic. I could check under the bonnet of the LCI but would require me to get my hands dirty.