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 Post subject: Re: Will an 2017 E-Golf make it??
PostPosted: Fri Feb 23, 2018 4:07 pm 
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Posts: 2021
ichwoo wrote:
The design of the E-GOLF (also IONIQ) is to allow the driver to change the amount of regen frequently like gear shifts. It is not how the designer intention for drivers to set to certain regen mode and leave it for the entire drive. Drivers should engage regen only when a stop is anticipated ahead, and increase regen power when stopping distance is insufficient. When even B mode is insufficient, then the driver should press the brake. After the stop, the car should be put in D again for optimum efficiency.


Exactly, you have a very good grasp of the principle. The less braking you use, and the more conservation of momentum you use, the better your miles per kWh on a charge.

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 Post subject: Re: Will an 2017 E-Golf make it??
PostPosted: Sat Feb 24, 2018 5:53 pm 
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Joined: Fri Dec 22, 2017 4:42 pm
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Location: San Jose, CA
Basically, nothing's more efficient than coasting, which is what your e-Golf is doing when your foot is on neither the brake nor gas. Those are free miles. And nothing's less efficient than friction braking, which turns your kinetic energy into heat. The purpose of B mode is to help you avoid friction braking. But regeneration isn't 100% efficient; some energy is lost converting kinetic to electric and some more is lost in the inverter, and finally not every electron that goes into the battery comes back out. All told, the roundtrip will preserve about 80-85% of the energy.

My understanding of the instrumentation is that you are regenerating ("recuperating") whenever the needle is in the green. If the needle gets all the way to 100, then the system will blend in friction braking as needed to get the desired deceleration. At very low speeds, only friction braking is used.

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 Post subject: Re: Will an 2017 E-Golf make it??
PostPosted: Sun Feb 25, 2018 9:48 am 
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Voltron wrote:
Basically, nothing's more efficient than coasting, which is what your e-Golf is doing when your foot is on neither the brake nor gas. Those are free miles. And nothing's less efficient than friction braking, which turns your kinetic energy into heat. The purpose of B mode is to help you avoid friction braking. But regeneration isn't 100% efficient; some energy is lost converting kinetic to electric and some more is lost in the inverter, and finally not every electron that goes into the battery comes back out. All told, the roundtrip will preserve about 80-85% of the energy.

My understanding of the instrumentation is that you are regenerating ("recuperating") whenever the needle is in the green. If the needle gets all the way to 100, then the system will blend in friction braking as needed to get the desired deceleration. At very low speeds, only friction braking is used.


/\ This. Regeneration is not free, there are still losses due to resistance and heat to the battery. Plus it accelerates the charging rate very high if "B" is used aggressively. Which is not good for battery longevity.

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 Post subject: Re: Will an 2017 E-Golf make it??
PostPosted: Thu Mar 08, 2018 11:55 am 
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Joined: Sat Jan 20, 2018 9:01 am
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Location: SoCal (Costa Mesa)
JoulesThief wrote:
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Let me know if you can even get 5.0 miles per kWh long term for 2500 miles driving in "B"mode. It excessively recharges your battery too frequently, IMHO. Better to coast or freewheel.


So far, we have 5.3 miles per kWh over 1200 miles recorded with 1000 miles driven with B selected. Driving patterns incorporate multiple short distances between stop signs - basically in the neighborhood. When driving between stop signs or lights that have a good distance between, coasting without B selected is the way to go. The last 400 feet prior to a stop sign or light downshift to B. I can't manually brake smoother than in B mode.


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 Post subject: Re: Will an 2017 E-Golf make it??
PostPosted: Thu Mar 08, 2018 4:17 pm 
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NurStrom wrote:
JoulesThief wrote:
....
Let me know if you can even get 5.0 miles per kWh long term for 2500 miles driving in "B"mode. It excessively recharges your battery too frequently, IMHO. Better to coast or freewheel.


So far, we have 5.3 miles per kWh over 1200 miles recorded with 1000 miles driven with B selected. Driving patterns incorporate multiple short distances between stop signs - basically in the neighborhood. When driving between stop signs or lights that have a good distance between, coasting without B selected is the way to go. The last 400 feet prior to a stop sign or light downshift to B. I can't manually brake smoother than in B mode.


I drive in D mode, and sometimes shift to D1 mode to slow down. 6.0 Miles per kWh, currently. San Fernando Valley. You can drive better than that, for efficiency, only if you want to. The potential is there. City stop lights, stop signs with max of 45 mph Blvds and residential driving.

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