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Guest Message by DevFuse

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Is there a sweet spot for battery level with EV later hybrid mode?

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4 replies to this topic

#1 OFFLINE   GlennR


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Posted 26 April 2018 - 05:46 AM

I sometimes wonder what is the effect of battery charge level on efficiency in hybrid mode when using EV Later. Is a full charge what you are striving for before embarking on a lengthy highway ride or does that limit the efficiency of the hybrid mode as the car will be seeking to preserve that charge?


Does charge level matter at all in hybrid mode?



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#2 OFFLINE   rbort


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Posted 26 April 2018 - 05:57 AM

+2% of the set point.  So 93% EV later or less will be good, as you want the battery to go up to 95% if you set it at 93 or 62% if you set it at 60%.


Once you charge the "hybrid" battery to +2% of the EV later set point, the gas engine will start to sing high MPG numbers down the highway at 65mph.


See videos I made about this.  They are posted here.  Once you reach +2% above the set point, you will want to "re-ignite" the engine after every downhill to prevent the battery from discharging and then having to recharge back up.  Also shown another video about this.



Edited by rbort, 26 April 2018 - 05:59 AM.

#3 OFFLINE   fotomoto


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Posted 26 April 2018 - 06:36 AM

Would also depend on the terrain as driving in a mountainous area provides more opportunities for "free" regen on the downhill side so having more room in the battery would be better.  


I live on coastal plains (flat as a pancake) and don't really see any difference on fuel economy vs SOC but then again I pretty much just lock on the CC and drive.  

#4 OFFLINE   jdbob


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Posted 26 April 2018 - 08:23 AM

Would also depend on the terrain as driving in a mountainous area provides more opportunities for "free" regen on the downhill side so having more room in the battery would be better.  


Very true. I've made mistakes in the past where my SOC was too high to make use of downhill regeneration forcing the use of friction brakes. Last fall I came down 5600 feet but fortunately I was into the hybrid portion of the battery when I started. By the time I got to the bottom I had 95% charge.

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#5 OFFLINE   stolenmoment


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Posted 26 April 2018 - 08:52 AM

To actually answer the question, there's no real sweet spot.


Entering the highway at full charge doesn't leave you any headroom to absorb downhill or deceleration energy; I typically switch from EV to EV Later when I'm on the ramp, when I know I won't be stopping for the next few minutes as the ICE warms up (so to speak).


For best battery lifetime, it's probably 50% or below; the cells prefer not to be at 0% or 100%.


For efficiency, it doesn't much matter, just cycle all the way around to EV later at the bottom of the hills to reap the energy you just gained.


Of course, if you play the game like I do, and cycle around whenever it's above the set point on the (mostly) flat, you're using gas to charge the battery, which is probably a losing proposition unless you're going to use that energy (switch to EV or Auto) when you leave the highway.


Slowing from freeway speeds gets you a few percent, so slowing down for an interchange impels me to cycle the EV button while on the ramp.


I also drive in L, and have learned to feather the pedal to charge or discharge pretty much as I wish.

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