Fjpod
Posts: 93
Joined: Sat Nov 30, 2013 6:11 pm
Location: NYC

Can we clear up Serial vs Parallel drive?

Mon Oct 12, 2020 5:40 am

I've read most of the posts, forgive me if I missed one that explains it....

Everyone seems to be saying that Parallel drive mode is more energy efficient. I haven't seen a difference in instantaneous fuel consumption or acceleration power. (Generally, I feel the Outlander PHEV acceleration is "great" considering what it is).

The car seems to choose whether it wants Serial or Parallel on its own. Nothing I do seems to make a difference going into whatever mode it uses.... whether I press the accelerator minimally or firmly. Going uphill or downhill... it seems to do what it wants....not what I think it should do.

Anybody have insight into this? I do not tow anything. Mostly suburban stop and go driving, with occasional highway driving. My questions center mostly around highway driving.
Previous prius and imiev owner.

oscarmax
Posts: 124
Joined: Sat Oct 27, 2018 3:47 am

Re: Can we clear up Serial vs Parallel drive?

Mon Oct 12, 2020 8:48 am

Mitsubishi Outlander 2.4 PHEV Design 2020 Towing a Swift Conqueror 480 2016 1500kg

Please be patient I suffered a brain injury several years ago and get confused at times

Fjpod
Posts: 93
Joined: Sat Nov 30, 2013 6:11 pm
Location: NYC

Re: Can we clear up Serial vs Parallel drive?

Mon Oct 12, 2020 11:02 pm

Thanks for the link. It does clear up a lot of things.

It does not support the assertion made by many here that parallel mode is more efficient than series. So, do we still have confusion?
Previous prius and imiev owner.

ChrisMiller
Posts: 585
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Location: Bucks

Re: Can we clear up Serial vs Parallel drive?

Tue Oct 13, 2020 1:21 am

Direct mechanical drive is likely to be more efficient than an indirect electrical one, which involves extra stages with inevitable losses occurring at each. Anyway, if it wasn't more efficient, why would the Mitsubishi engineers have included it? It must surely carry some weight penalty.
GX4h (2016) since 23/12/2015

Fjpod
Posts: 93
Joined: Sat Nov 30, 2013 6:11 pm
Location: NYC

Re: Can we clear up Serial vs Parallel drive?

Tue Oct 13, 2020 1:44 am

ChrisMiller wrote:
Tue Oct 13, 2020 1:21 am
Direct mechanical drive is likely to be more efficient than an indirect electrical one, which involves extra stages with inevitable losses occurring at each. Anyway, if it wasn't more efficient, why would the Mitsubishi engineers have included it? It must surely carry some weight penalty.
For more power?
Previous prius and imiev owner.

jaapv
Posts: 4586
Joined: Mon Dec 16, 2013 1:18 pm
Location: Netherlands

Re: Can we clear up Serial vs Parallel drive?

Tue Oct 13, 2020 2:38 am

I suggest you browse the forum. There have been discussions and explanations for serial vs parallel hybrid, including graphs, ad nauseam.
The short answer is: the Mitsubishi solution, including the software controlling it, is quite efficient.
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littlescrote
Posts: 235
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Re: Can we clear up Serial vs Parallel drive?

Tue Oct 13, 2020 5:04 am

Fjpod wrote:
Tue Oct 13, 2020 1:44 am
For more power?
How do you suppose that you can get more power out of the engine when it is linked to the road wheel speed in Parallel mode than when it is free to rev higher in Series mode? As with pretty much every engine ever built, (generally) more revs = more power

For any given rpm, there will be slightly more power available at the wheels when in parallel mode due to the explanation of losses above, but that's it.

ChrisMiller
Posts: 585
Joined: Tue Jan 12, 2016 6:37 am
Location: Bucks

Re: Can we clear up Serial vs Parallel drive?

Tue Oct 13, 2020 12:40 pm

To deliver more power than the 160bhp* available in serial mode, the car speed (i.e. the equivalent engine revs) needs to be over 75mph/120kph. You can demonstrate this (on a straight, empty road!) by flooring it - the car will remain in serial mode up to this speed. To achieve the maximum power (200bhp) in parallel mode, you would need to be doing almost 100mph.

* from the 2x60kW electric motors (slightly more in the latest version with the 2.3l engine)
GX4h (2016) since 23/12/2015

Tai626
Posts: 115
Joined: Sat May 19, 2018 7:01 am
Location: Los Angeles, CA, USA

Re: Can we clear up Serial vs Parallel drive?

Mon Oct 26, 2020 11:43 am

Parallel mode is possible at speed > 45mph. My trick is “release” the torque in the transmission like I change gear in my bicycle. It works every time if the engine is warm Enough in the “charge mode”.

Tai

ps. Try search for the “series” instead of “cereal“ :-)
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jaapv
Posts: 4586
Joined: Mon Dec 16, 2013 1:18 pm
Location: Netherlands

Re: Can we clear up Serial vs Parallel drive?

Mon Oct 26, 2020 5:07 pm

Yes, but it is not very efficient. The low engine revs mean that the ICE is delivering little power, and well outside its most effective rev range as well.
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