Max Regeneration Mode / Cruise Control

[shansonpac]

I have noticed that when the Max Regeneration button is active (green icon), the minute that you activate and set cruise control either in standard or ACC, the icon becomes gray (Not available). The gauges show that electricity is being generated on slowing, braking and downhill. Is it charging the battery with the Max Regeneration icon is gray?

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[whenasked]

I have noticed that when the Max Regeneration button is active (green icon), the minute that you activate and set cruise control either in standard or ACC, the icon becomes gray (Not available). The gauges show that electricity is being generated on slowing, braking, and downhill. Is it charging the battery with the Max Regeneration icon is gray?

Yes, it is charging in Maxregen. However, using Maxregen on the highway to charge a battery will impact the gasoline fuel efficiency (as you lose the coasting ability). In my opinion, use MaxRegen only when you need the battery charged at the end of the trip.

 

[mllcb42]

Clarifying what max regen does will help explain why you're seeing what you're seeing.

The 4xe uses a blended braking system that does initial braking with the regenerative braking system (RBS) and then adds in mechanical braking when it needs to. This is basically when you're demanding more than .25g of deceleration, when coming to a complete stop, or some times when the traction control steps in. It does this in max regen AND in normal mode.

What max regen does is remap the control input to activate this. In normal mode, when you start to press on the brake pedal, it engages the RBS. As you press harder, the mechanical brakes will engage.

With max regen on, the engagement of the RBS is remapped from pressing the brake pedal to letting off the accelerator. When you release the gas, the RBS engages. When you press the brakes, you'll get more braking, and then the mechanical brakes engage.

What max regen doesn't do is increase the amount of regeneration you're getting in normal driving, it just engages the RBS sooner. You can effectively achieve the exact same thing if you immediately put your foot on the brake after taking it off the gas.

When in cruise control, the jeep takes over throttle and braking inputs, so your foot is off the gas. It'll engage the RBS as needed to slow, but it obviously won't as you take your foot off the gas since it is now handling throttle inputs.

 

[bossboy302]

I just played with Regen/Max Regen yesterday on way home from Tahoe (long downhills).
I've concluded that the Max Regen 'seems' to result in more forceful decelerations, thus 'over-slowing' the Jeep. So in my experience, Regen works great on highway, and Max Regen works better in stop-and-go.

 

[mllcb42]

I've concluded that the Max Regen 'seems' to result in more forceful decelerations

It's doing the exact same thing as if you were in regular mode and put your foot on the brake.

 

[bossboy302]

It's doing the exact same thing as if you were in regular mode and put your foot on the brake.

Right. The idea is to avoid the brake pedal when going down a 5% grade for 5 miles.....
I found at higher speeds the downhill 'coasting' to work better in regen.

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