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 Post subject: Re: Charge Mode vs Save mode on the highway
PostPosted: Mon Jan 06, 2020 4:35 am 
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Joined: Fri Jul 26, 2019 3:52 am
Posts: 146
Just because the engine speed is proportional to the vehicle speed in parallel mode, it doesn't mean that the fuel consumption will be. The generator load can be increased as well as the load on the engine from the transmission (e.g. uphill) so although engine rpm may be 'fixed. the throttle opening and injector duration are not, so it's not possible to state that parallel mode at 65 kph is the most efficient operating point.


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 Post subject: Re: Charge Mode vs Save mode on the highway
PostPosted: Tue Jan 07, 2020 2:26 am 
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Joined: Mon Mar 12, 2018 2:18 am
Posts: 586
Location: Yorkshire end of M1, UK
Indeed. At each engine speed, there will be a smallish range of load at which the ICE is most efficient. I assume that Mitsubishi try to run the ICE at that load and divert any extra power to charging. Under heavy load, such as on hills and at higher speeds, it will have to run outside that load range, but it will try to use the battery to keep ICE power demands down

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 Post subject: Re: Charge Mode vs Save mode on the highway
PostPosted: Tue Jan 07, 2020 1:13 pm 
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Joined: Mon Jan 27, 2014 6:33 am
Posts: 16
The Sweetspot is always near the max Torque, the lower the rmp the better.
The Problem in the Parallel Mode is that the ICE Power may not be enough to drive the car and the Electric motors have to help driving. Under this circumstance the Batterie will not be charged but emptied and below Batterie SOC of 25% it will switch to seriell mode to charge the Batterie again.

https://www.myoutlanderphev.com/forum/viewtopic.php?f=10&t=3413&start=20

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 Post subject: Re: Charge Mode vs Save mode on the highway
PostPosted: Wed Jan 08, 2020 5:17 am 
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Location: Yorkshire end of M1, UK
I've no idea what you mean by sweetspot, but the highest efficiency is not better the lower the rpm. The highest efficiency will be at a fixed rpm and load, with the efficiency dropping off as either of those parameters are changed. Imagine the highest efficiency as the top of a hill, with a drop-off in every direction.

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 Post subject: Re: Charge Mode vs Save mode on the highway
PostPosted: Wed Jan 08, 2020 6:36 am 
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Joined: Mon Dec 16, 2013 1:18 pm
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Location: Netherlands
If somebody cares to search the forum, there were a few ICE/load diagrams in the forum a few years ago.

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 Post subject: Re: Charge Mode vs Save mode on the highway
PostPosted: Wed Jan 08, 2020 9:00 am 
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Joined: Mon Jan 27, 2014 6:33 am
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Sweet Spot is the Range in rpm vs. torque where the efficiency ist best

[img]
Attachment:
sweetspot_media-1110926-stmhybrid3.gif
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 Post subject: Re: Charge Mode vs Save mode on the highway
PostPosted: Wed Jan 08, 2020 9:14 am 
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Joined: Mon Jan 27, 2014 6:33 am
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..or even better in an Diagram of the GM Volt.
The Enemy of high Efficiency ist high rpm and partial load.

[img]
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 Post subject: Re: Charge Mode vs Save mode on the highway
PostPosted: Thu Jan 09, 2020 3:27 am 
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Joined: Mon Mar 12, 2018 2:18 am
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Location: Yorkshire end of M1, UK
FWIW I studied this during my degree.

The contour for highest efficiency seems to range from 1500-3500rpm in the Volt. The earlier graph looks more of an idealised map rather than an actual real-life graph. So you can get very high efficiency at a wide range of rpm, and it isn't a case of "the lower the rpm the better" as was stated earlier

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