SnBGC
Well-Known Member
- First Name
- Greg
- Joined
- Apr 20, 2020
- Threads
- 46
- Messages
- 5,955
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- 9,749
- Location
- Phoenix
- Vehicles
- 2021 Mach-E FE, 2021 Wrangler 4xe High Altitude
- Occupation
- Manager
In my example above......I am describing what happens when you lift off the accelerator pedal and let the vehicle come to a stop without any additional intervention. Say for instance you are driving on an abandoned air field and have lots of room to play around. Get the vehicle to 60 mph and pull your foot off the accelerator pedal. The 1PD setting won't harvest as much energy as the pre-programmed regen setting native in Engage or Unbridled. (Whisper has zero regen so the vehicle will coast until it's kinetic energy runs out naturally due to rolling and wind resistance). Assuming level ground.You may have better info than I do but 1-pd is total regen as the motor is doing all the work to slow and stop the car. When the brake is applied some of the energy in braking is lost to friction heat with the pads and rotors.
However, the theory applies even under the condition you describe. When you depress the physical brake pedal the regen level is increased. You have to really press down quite hard before the friction brakes are blended in. A driver with reasonable driving habits will almost always be able to maximize the recovered energy even when 1PD is turned off.
Conversely, with 1PD enabled......if the driver abruptly lifts off the accelerator pedal, the vehicle MAY blend in the friction brakes because it might interpret that as a panic stop. Not normal, but could happen. I believe the vehicle uses the on board ADAS features to assist 1PD with smooth operation so the car may in fact blend in the friction brakes even though the driver isn't aware of it. (not confirmed yet.....just a suspicion of mine at the moment......) Even then, it's a very slight difference and not significant enough to make a difference in overall range.
I am very curious to do some data capturing runs while descending a large mountain grade. I want to try it in 1PD and maintain a preset safe speed. Then do it again with 1PD off and holding speed with the brake pedal and then once more with L engaged and 1PD off. I am curious to see how much and how often the friction brakes are applied. I believe I can do that by data logging the ABS pressure but not sure yet. ?
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