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Single Speed Transmission

Posted: Mon May 09, 2011 2:36 pm
by evluv
The Ford Focus Electric comes with a single speed transmission - or does it?

Image

This picture from Ford's website clearly shows a 'low' and a 'drive' setting, not to mention reverse. Does reverse count as a speed? Low does for sure. To me it looks like the Ford Focus Electric has a 2 speed transmission.

Ford states the transmission is built specifically to handle the high rpms that an electric motor puts out. Being single speed, the Ford Focus Electric will have quick responsiveness and silky smooth acceleration... oh and 'no-compromise driving fun'

Re: Single Speed Transmission

Posted: Mon May 09, 2011 2:53 pm
by toffty
I'm going to assume that it works like the Prius - except reverse which'll probably be different

-Drive - One speed transmission
-Low - Same gear set but when your foot is off the A peddle your regenerate evergy faster than when in drive. This is great when going down hill: less wear on your brakes and you get more 'free' energy in your battery.
-Reverse - The same gear set is used, all you do is reverse the flow of electricity to make the electro-magnetic field point in the other direction in the motor. There's probably a speed limit in the software to prevent you from going 60 in reverse

Re: Single Speed Transmission

Posted: Mon May 09, 2011 3:25 pm
by california
On the Leaf there is a separate control setting for extra re-generative power, or economy mode I think it's called, so that you can turn it off if you want a smoother ride.

Is that what you mean by the 'low' setting in the Focus EV?

Re: Single Speed Transmission

Posted: Tue May 10, 2011 4:52 pm
by jeff_h
I have a Fusion Hybrid with ECVT, which also has a 'D' and 'L' although I've never used the 'L' at all. Below is what the owner's manual says about low gear:


"Low Gear: L (Low gear) is designed to mimic the enhanced engine braking available in non-hybrid vehicles. L (Low gear) will produce high engine speeds to provide necessary engine braking. This is normal and will not damage your vehicle. In L (Low gear) the gas engine will remain on more often than in D (Drive gear)."

Re: Single Speed Transmission

Posted: Wed May 11, 2011 8:52 pm
by california
Thanks Jeff - sure works nice to see what a Ford Fusion manual says about the D and L on the shifter, which we should be able to assume it means the same on the Ford Focus Electric shifter?!? I've noticed a lot of assuming about the Focus EV going on in this forum!

Re: Single Speed Transmission

Posted: Thu May 12, 2011 3:44 pm
by jeff_h
california wrote:I've noticed a lot of assuming about the Focus EV going on in this forum!
Unfortunately this is all we have at the time... however once a little more exposure is made, I hope others will post more info to include pics etc. I sure will if I find one at a dealer in DC or Richmond, I'm anxious to check it out.

Re: Single Speed Transmission

Posted: Sat May 14, 2011 5:54 am
by california
jeff_h wrote:Unfortunately this is all we have at the time... however once a little more exposure is made, I hope others will post more info to include pics etc. I sure will if I find one at a dealer in DC or Richmond, I'm anxious to check it out.
I second that! More info already, Ford!

Re: Single Speed Transmission

Posted: Thu May 03, 2012 5:51 am
by fordfocuselectric
According to the Ford Focus Electric Owner's Manual the D stands for Drive, and the L stands for low - which is the same as drive but provides maximum motor braking.

Apparently it's not intended for use under extended or normal driving conditions and results in less miles per charge.

It must do more than provide maximum motor braking, because that should just create more regen? Unless of course it slows the vehicle as soon as you let off the accelerator so there's no real coasting option?

Re: Single Speed Transmission

Posted: Sun May 27, 2012 11:38 am
by Rwbill
Ford does refer to drivers having to adjust to the regen mode. Sometimes it reads as if the motor engages the wheels and would seem to slow down the car, which would not make sense. It may put power back into the battery but that would accomplish little or be counter productive to merely needing to coast for a few seconds. I'll need to work this out after I get my FFE.

Re: Single Speed Transmission

Posted: Mon May 28, 2012 11:54 am
by mrpalerider
I'm surprised their not putting transmissions in these things, they'd get better mileage/per charge if they added gearing to reduce the motor load at low speed. No benefit to the motor as a DC motor specifically wound can produce constant torque at a broad range of speeds, but it would definitely lighten the load on the batteries. I could see that in the future when we start seeing high performance EV sport cars.

http://www.myfocuselectric.com/forum/vi ... ?f=7&t=587

Looks as though this posting by Rwbill shows that the FFE has a standard automotive transmission that is 'single speed'