[Mllcb42]

But once I hit 1% the fuel engine works whole time, like its not charging the battery, Im only seeing 1%, only when I stop and accelerate (till 5-8 miles) then uses electric.

It's constantly charging the battery. It then uses that power to augment the gas engine with power delivery. You're unlikely to build up extra power that would result in an increase in the battery state of charge, but you are constantly charging and discharging.

 

[Mllcb42]

guy above said it does not charge from engine

It does charge from the engine at times

 

[Mllcb42]

Im getting mixed signals now, so does it charge or not.......))))

We need to clarify when you say "charge" what you actually are asking.

It sounds like you're not asking about charging as much as you're asking about charging at a high enough rate to significantly increase the state of charge of the battery.

Just because you're not seeing the battery level increase from <1% does not mean there isn't charging going on. You're just using up the electricity as quickly as your charge it. Because the battery capacity is large, it just doesn't really show up.

It primarily is using the regenerative braking system to do this, but there are plenty of times when the gas engine will also charge.

It generally tries not to do this a lot, unless there is a good reason, because it isn't fuel efficient to do so. Some hybrids have gas engines that run different engine cycles and/or are tuned to be more efficient acting as a generator than actually moving the vehicle, so they do it more often.

Also, keep in mind that on a normal hybrid, the battery is much smaller, so a much smaller amount of charge will register as a percentage increase. The same 100 Wh may not move the needle on the 4xe but be a couple percent increase on a mild hybrid.

If you want to see a lot (albeit still slow) of charging that actually builds up extra charge on the 4xe from the engine, you need to use esave charge. Just ve aware you're wasting more money on gas than you're saving by doing so.

 

[Mllcb42]

The owners manual gives a very basic rundown but certainly doesn't answer the question in any sort of detail.

 

[Mllcb42]

And in e-save is stops being a hybrid in that it tries to maintain the high voltage array.
At least that's my take

Nope. It's always a hybrid. In esave, it'll still charge as needed and get extra power augmentation from the electric motors on acceleration.

 

[Mllcb42]

Switching back and forth then........?

Absolutely. It is constantly charging and discharging, depending on the circumstances. In limited occasions, it'll go into ful series hybrid mode where the gas engine is running with the sole purpose of generating power through the p1 motor and the p2 motor is taking that charge and propelling the vehicle. It doesn't do that most of the time, but it does occasionally.

The 4xe is a series/parallel hybrid that typically runs as a parallel hybrid. Its behavior is fairly typical for that type of hybrid architecture, but people often confuse its operation for other vehicles that are either pure series hybrids or series/parallel hybrids that bias towards series use.

 

[Mllcb42]

I guess it's easier in the 4xe native language of kilowatts. Engine puts out xx kw, drives the Jeep and P1 to generate xx kw, some of that is used to go to the HV battery pack, some is powering P2

The answer here is... I don't actually know if during esave charge in steady state running if the charging is all going on in the p1 or the p2 motor or both. If I remember tomorrow I'll take a look at what each motor is going. I'm sure its not charging from one and powering the other as that would be really counterproductive.

 

[Mllcb42]

I guess it's easier in the 4xe native language of kilowatts. Engine puts out xx kw, drives the Jeep and P1 to generate xx kw, some of that is used to go to the HV battery pack, some is powering P2

The answer is that the power capture during e-save charge occurs in the p2 motor (motor B below).

At idle (generating about 6 kW):

At 70 mph (generating about 20 kW):

 

[Mllcb42]

When you say KW, are you mistaken as that's just the torque being generated by the engine, the actual KW would be less wouldn't it?

Actually had my numbers off because I plugged in the wrong rpm (motor A instead of motor B)


kW=.105 x NM x rpm/1000

So .105 x 24.5 x 968/1000 = 2.5 kW

8ish kW at 70 mph