Top speed in Hybrid electric only mode?

[Wrench77]

On the Lariat Sync3 system there's also a powerflow screen in the "Apps" section that will show an animated version of your truck and where the power is coming from as well as why "Engine running due to heater settings" etc. I don't know if this screen exists on the XL or XLT.

I was wondering if they had a power flow screen. I like to watch gauges and think this is a nice addition.

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[STARCOMMTREY1]

On the Lariat Sync3 system there's also a powerflow screen in the "Apps" section that will show an animated version of your truck and where the power is coming from as well as why "Engine running due to heater settings" etc. I don't know if this screen exists on the XL or XLT.

It does not that i found.

 

[fbov]

.... I'm wondering how fast you can go before the ICE has to even rotate to keep mg2 below safe rpms.

So, in planetary terms, you want to keep the planet carrier stationary (ICE off). To my understanding, that occurs when the sun and ring gear RPM are equal. That means the charging motor needs the same redline as the traction motor to allow ICE to be off.

However, we know that the control system will never allow ICE off at redline. ICE will always run above 85 mph to cool the stators.

 

[r100gs91]

My Toyota Venza hybrid was doing 60+ for about 3 miles coming down a very slight hill on pure battery. Does not happen often but it sure is good for MPG.

 

[clavicus]

So, in planetary terms, you want to keep the planet carrier stationary (ICE off). To my understanding, that occurs when the sun and ring gear RPM are equal. That means the charging motor needs the same redline as the traction motor to allow ICE to be off.

However, we know that the control system will never allow ICE off at redline. ICE will always run above 85 mph to cool the stators.

I'm not sure if I'm following this example.

The planet carrier (splined to ICE crankshaft) being stationary happens when the computer stops the ICE fuel/air injection and sparkies, which then removes the force that is making the planets in the gearset orbit, and since the orbit of the planets is being resisted by the ICE being stationary, the forces of the ring gear cause the planets to revolve in place and the ring gear force flows to the path of least resistance (towards spinning the sun gear). If the planets are not being pushed in an orbit by the ICE, then the ring gear (wheels) rotation is what determines the rotation of the sun gear (opposite direction of the ring gear actually, per usual I think) as long as the computer is not doing anything with the MG2 to stators? So in that case yes ring gear and sun gear RPM are equal but... (bear with me)...

When the planet carrier is rotating (ICE is running), the relationship between the sun gear and the ring gear becomes a lot more complicated, because it's based on the relative rotation of the planet carrier, ring gear, and the computer's choice of MG2 (sun gear) resistance to spin, or made to spin even faster than the planet carrier (underdrive gear ratio?), or even being spun in the opposite direction of the planet carrier when in an overdrive (high) gear ratio like when cruising at high speeds. But you can also reach direct drive gear ratio (1:1) where planet carrier, ring gear, and sun gear, are all spinning at the same rate. So anyway, that's why I'm not sure what you mean by sun and ring gear RPM being equal means the ICE is off.

 

[huunvubu]

Ford's third generation Hybrid HD-35 Transaxle can run on electric power up to 85 MPH speeds.

Queued video here quotes that 85 MPH Speed:




There is a fourth generation HD-45 Transaxle and the Transaxle in the Maverick Hybrid is an improved version of the HD-45 with the traction motor having a boost in power because the magnets in it are V-Shaped which improve efficiencies.

So I expect that the Ford Maverick Hybrid can also run on electric power up at the same 85 MPH or possibly above as long as surface is flat and no or minor head winds.

Using the EV-Coach screen on the Maverick you can try it by getting up to that speed on a flat surface then briefly take you foot off the accelerator then re-apply it to maintain speed.

The display will show if you are in electric mode.

 

[jonathan1994]

I bought my truck and went straight to the Pennsylvania turnpike. I never got the ICE to turn off above 75mph.

75mph cruise control with little traffic to slow us down got 31mpg.... mostly uphill. ICE always on.

74mph cruise control with more traffic got 36mpg and would often go electric down steep hills and when traffic slowed.

 

[DryHeat]

If the planets are not being pushed in an orbit by the ICE, then the ring gear (wheels) rotation is what determines the rotation of the sun gear (opposite direction of the ring gear actually, per usual I think) as long as the computer is not doing anything with the MG2 to stators? So in that case yes ring gear and sun gear RPM are equal

I don't think I understand this.

I think you are saying that, if the planetary carrier is stationary, then the sun gear and ring gear rotate at the same RPM (but in opposite directions).

But is that right? I thought the sun and ring gear only had the same RPM when the planet carrier also had that same RPM (so the whole assembly turned as a unit).

If the planet carrier is really at zero RPM, then there will be a difference between the RPM of the ring gear and the RPM of the sun gear. That difference is based on the ratio of the number of teeth on each (the ring gear always has more than the sun gear). So... different RPM.

Am I wrong about that?

 

[clavicus]

I don't think I understand this.

I think you are saying that, if the planetary carrier is stationary, then the sun gear and ring gear rotate at the same RPM (but in opposite directions).

But is that right? I thought the sun and ring gear only had the same RPM when the planet carrier also had that same RPM (so the whole assembly turned as a unit).

If the planet carrier is really at zero RPM, then there will be a difference between the RPM of the ring gear and the RPM of the sun gear. That difference is based on the ratio of the number of teeth on each (the ring gear always has more than the sun gear). So... different RPM.

Am I wrong about that?

Ah yeah you’re right. I wrote out a response about how you were right, and then realized I was wrong about why you were right but you’re still right lol. And also fbov is right, but he just mispoke maybe just like I did in that part by saying RPM when we both probably meant relative rotation of different gears, like you described. So I guess in conclusion my whole post before was a misguided hand flapping from a misunderstanding. It is fun to think about though

 

[Mach 1]

Damn Clav, you said a mouthful, good thoughts.

I do 65mph regularly, I hold 55mph a good ways, can do a couple miles. Its tough to do with traffic, I do travel after 9pm, hardly anyone's out and I can drive how I want. My best with little inclines is 6m of electric only on highway, nobody around. I drop down to about 45mph, catch a little hill, recharge enough to get further down highway. Its a challenge that I make a game out of.

 

[Sykotyk]

My new high score

And just to prove it does go from charge to electric before activating the engine:

 

[MostlySafeBear]

My new high score

And just to prove it does go from charge to electric before activating the engine:

While I appreciate knowing that the electric motor can engage at 80 MPH..

A speed of 91 MPH is just crazy. I've never bought the 'keeping up with traffic' excuse, as traffic doesn't pay your fuel bills or your medical bills if you have a tire blowout. Further, modern vehicles have automatic emergency braking to prevent inattentive drivers from rear-ending you. It's not guaranteed to be on all vehicles, but it's part of the standard suite of safety tech, and it's on more vehicles every day, as I think it is federally mandated.

It's not worth it to me to save a few minutes at best for a massively increased risk factor.

 

[James D]

This video shows over 60 sustained speed.

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