E-Save with Battery Charge Results on Highway

PriceForFlight

Well-Known Member
First Name
Mark
Joined
Jun 30, 2017
Messages
79
Reaction score
88
Location
Georgia
Vehicle(s)
2021 4xe Rubicon
Picked up my new 4xe Rubicon on Saturday. Of course, I mostly depleted the battery during my test drive that morning and by the time I got to the highway for the drive home (6.5 hours) I was at less than 1 percent battery. I drove the 4xe on Hybrid mode for the first 3.5 hours, then, reading somewhere that the battery would fully recharge in 2 hours at 55 mph, I switched to E-Save with the "Battery Charge" option checked in the settings menu. I took some pictures of the dash while driving so I could document how fast the 4xe charged.

2:35PM: <1% and the start of "E-Save with Battery Charging option checked"
3:06PM: 2% Battery
3:46PM: 9% Battery
4:35PM: 18% Battery

So, in a full two hours of driving at 75 mph with cruise control on, I only went from 1% to 18%. I would watch the hybrid screen page on UConnect and it appeared to me the vehicle was USING battery power more often that it was actually charging the battery.

I'm interested to know what results others are getting...
Advertisement

 

WhereRU_A-A-Ron

Well-Known Member
First Name
Aaron
Joined
May 23, 2020
Messages
385
Reaction score
799
Location
Arkansas
Vehicle(s)
2021 Unlimited Willys, 2015 Toyota Sienna XLE
Occupation
Restaurant Manager
Your engine was using most of the power it was generating to maintain vehicle speed. The system can pull excess energy from the engine IF it’s there.

Not only did you have very little energy left over to send to the battery but, as you mentioned, the system felt it needed to USE the battery in order to maintain your pace. Your results would be MUCH better at slower speeds. Even 65 mph would’ve probably significantly increased your regen rate.
 
OP
OP
PriceForFlight

PriceForFlight

Well-Known Member
First Name
Mark
Joined
Jun 30, 2017
Messages
79
Reaction score
88
Location
Georgia
Vehicle(s)
2021 4xe Rubicon
Your engine was using most of the power it was generating to maintain vehicle speed. The system can pull excess energy from the engine IF it’s there.

Not only did you have very little energy left over to send to the battery but, as you mentioned, the system felt it needed to USE the battery in order to maintain your pace. Your results would be MUCH better at slower speeds. Even 65 mph would’ve probably significantly increased your regen rate.
Interesting take, and that’s what I assumed as well. It makes total sense. The problem is I watched the Hybrid systems page while the vehicle would surge in power (RPM increase) to speed up (on adaptive cruise) it would dump more power in the battery than when I was just cruising along at slower speeds.

But, I’d love to hear real world experience on someone cruising at 55 or 65 for two hours to see what results they had.
 

4xeRubicon

Active Member
First Name
Steve
Joined
Apr 20, 2021
Messages
28
Reaction score
51
Location
DC
Vehicle(s)
2021 Rubicon 4xe
But, I’d love to hear real world experience on someone cruising at 55 or 65 for two hours to see what results they had.
I went from 1-30% in about 2 hours of fairly flat highway driving with adaptive cruise set between 60-65. Driving back that same day I got to 65%.
 

michail

Well-Known Member
First Name
Michael
Joined
Apr 22, 2021
Messages
568
Reaction score
279
Location
Florida
Vehicle(s)
2021 Sahara 4xe
It doesn't seem like the recharge mode would be worth much use then. Even when you go off-road in hybrid, at the slow speeds the engine doesn't come on that much. Driving at < 25 mph in hybrid, the engine may only come on in spurts.

Any observations on the MPG while charging? Laws of thermodynamics dictate it won't be good!
 

mcburris

New Member
First Name
Marcus
Joined
May 16, 2021
Messages
2
Reaction score
1
Location
Raleigh, NC
Vehicle(s)
2021 Jeep Wrangler 4xe
In hybrid or eSave and driving at highway speeds the battery will not be able to charge. I think you need to keep it under 55 to actually start charging while driving. Think of it this way. The engine produces only so much power. The faster you go the less power that is available to charge the battery.
 

deeve

Member
First Name
David
Joined
Jul 5, 2018
Messages
15
Reaction score
3
Location
Hillsboro, Oregon
Vehicle(s)
2017 Jeep Wrangler JK (no U)
I was looking at this the other day as well. I think even when in esave the Jeep still functions in hybrid mode as the powerflow screen shows energy still flowing back and forth when needed. My belief is the "hidden" 15% reserved for hybrid driving is being used even when in esave. Esave must just "save" that other side of the battery that is reserved for electric only driving.
Dave
 

Jocko

Well-Known Member
Joined
May 25, 2018
Messages
221
Reaction score
245
Location
Boston
Vehicle(s)
Hydro Blue 4xe Rubicon
Yes the system is essentially always in hybrid mode. I think of the 4xe as having one main hybrid control program and each driving mode as just a way to tweak the behavior of that main program slightly. Basically the mode you select is how you tell the hybrid system what its priority should be. It's always the same hybrid drive working with all components in play, but the decisions the computer make will change slightly to accomplish the priority you have given it. That's why in electric mode, for example, it will do everything it can to avoid gas usage, but if you floor it, the computer has no choice but to fire up the engine in order to fulfill your request for power.
 
Advertisement

JKS Manufacturing
 
Advertisement
Top