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 > BEV as a toad behind diesel pusher

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mike-uswest

Central Point, OR, USA

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Posted: 12/22/21 09:21am Link  |  Quote  |  Print  |  Notify Moderator

Well,going to a recent back post, I looked up BEV and BEV/RV on google to no avail. I guess I'm just too old to know what people are talking about anymore.

Mike


2019 Ram 2500 TCD, 4X4,
Arctic Fox 25Y 30'


Reisender

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Posted: 12/22/21 09:25am Link  |  Quote  |  Print  |  Notify Moderator

mike-uswest wrote:

Well,going to a recent back post, I looked up BEV and BEV/RV on google to no avail. I guess I'm just too old to know what people are talking about anymore.

Mike


Good morning. A BEV is a battery electric vehicle.

JRscooby

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Posted: 12/22/21 09:27am Link  |  Quote  |  Print  |  Notify Moderator

Reisender wrote:


Any EV we have owned has had a neutral position. So free spin down the road with no regen. Putting it back in drive immediately engages regen.


I could well be wrong, but I assumed the neutral position was just dis-connect the motor electrically. Are you saying that there is a mechanical dis-connect between wheel and motor? If so, that would mean even less friction than I thought.(But more moving parts than I expected)

Durb wrote:

JRscooby wrote:

Now to get into the most interesting idea. Some new vehicles can follow at a certain distance. Why couldn't things be wired so when MH is full throttle, power is turned on, so the toad pulls it's own weight? Or even push the MH some?


Wow, never considered this. Potential exists to use regenerative braking to help slow the MH and applying the juice to help push the MH when needed. Essentially, the BEV toad would be turning the DP into a hybrid.


Not sure you could get enough push to call it hybrid. Tire slip would be a issue. But I have read about people unhooking toad, driving separate on steep uphills. A self propelled toad would eliminate the need for that. Drafting that close behind MH, would go a long ways before pulled enough out of battery to have re-gen on the downside. But pushing the MH would discharge battery fast, so regen could help the jake, keep service brakes cool incase needed.

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Posted: 12/22/21 09:32am Link  |  Quote  |  Print  |  Notify Moderator

JRscooby wrote:

Reisender wrote:


Any EV we have owned has had a neutral position. So free spin down the road with no regen. Putting it back in drive immediately engages regen.


I could well be wrong, but I assumed the neutral position was just dis-connect the motor electrically. Are you saying that there is a mechanical dis-connect between wheel and motor? If so, that would mean even less friction than I thought.(But more moving parts than I expected)

Durb wrote:

JRscooby wrote:

Now to get into the most interesting idea. Some new vehicles can follow at a certain distance. Why couldn't things be wired so when MH is full throttle, power is turned on, so the toad pulls it's own weight? Or even push the MH some?


Wow, never considered this. Potential exists to use regenerative braking to help slow the MH and applying the juice to help push the MH when needed. Essentially, the BEV toad would be turning the DP into a hybrid.


Not sure you could get enough push to call it hybrid. Tire slip would be a issue. But I have read about people unhooking toad, driving separate on steep uphills. A self propelled toad would eliminate the need for that. Drafting that close behind MH, would go a long ways before pulled enough out of battery to have re-gen on the downside. But pushing the MH would discharge battery fast, so regen could help the jake, keep service brakes cool incase needed.


Re the neutral question. I don’t know. I just know if I select neutral it is like selecting neutral in our old Grand Cherokee. It just rolls. What’s happening on the mechanical side is out of my area of exercise. We use it every time we go thru a car wash.

mike-uswest

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Posted: 12/22/21 09:33am Link  |  Quote  |  Print  |  Notify Moderator

Reisender wrote:

mike-uswest wrote:

Well,going to a recent back post, I looked up BEV and BEV/RV on google to no avail. I guess I'm just too old to know what people are talking about anymore.

Mike


Good morning. A BEV is a battery electric vehicle.


Thank you.

Durb

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Posted: 12/22/21 10:32am Link  |  Quote  |  Print  |  Notify Moderator

With all the technology designed into battery electric vehicles, I'm guessing that designing software to make them push/pull on demand would be easy-peasy on their complexity scale.

Skibane

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Posted: 12/22/21 02:34pm Link  |  Quote  |  Print  |  Notify Moderator

FWC wrote:

With auto driving also on the radar, what about not even connecting the car to the MH? It just follows along 5m behind the MH as if it were towed? No hooking up, no disconnecting, no extra length or weight on hills. With some sort of beacon on the MH for the car to follow, this seems like a much easier control problem than 'normal' auto pilot for an EV.


A true self-driving vehicle wouldn't even need to stay behind the motorhome - just program in the desired destination, and the vehicle would get there on its own.

Naturally, due to range limitations, it might need to meet you at designated charging stations along the way.

FWC

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Posted: 12/22/21 05:39pm Link  |  Quote  |  Print  |  Notify Moderator

Skibane wrote:

FWC wrote:

With auto driving also on the radar, what about not even connecting the car to the MH? It just follows along 5m behind the MH as if it were towed? No hooking up, no disconnecting, no extra length or weight on hills. With some sort of beacon on the MH for the car to follow, this seems like a much easier control problem than 'normal' auto pilot for an EV.


A true self-driving vehicle wouldn't even need to stay behind the motorhome - just program in the desired destination, and the vehicle would get there on its own.

Naturally, due to range limitations, it might need to meet you at designated charging stations along the way.


Agreed, with true self driving there would be no need to follow along.

My thought is that a follow on mode would be much easier to achieve than full self driving and gets away from some of the murky legal and liability issues with self driving vehicles. The technical challenges are far easier - just follow the huge MH in front of you and from a legal/liability issue the EV could be treated just the same way a towed vehicle.

philh

Belleville MI

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Posted: 12/22/21 06:37pm Link  |  Quote  |  Print  |  Notify Moderator

ktmrfs wrote:

when we were looking at hybrids NONE that we looked at (both mild hybrids and plug ins) allowed 4 down towing. ALL made it very clear that the car MUST be flatbed towed. Now we didn't look at all but we did look at many.

Ford Hybrids are flat tow capable.

* This post was edited 12/22/21 09:55pm by an administrator/moderator *

way2roll

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Posted: 12/23/21 07:08am Link  |  Quote  |  Print  |  Notify Moderator

FWC wrote:

Skibane wrote:

FWC wrote:

With auto driving also on the radar, what about not even connecting the car to the MH? It just follows along 5m behind the MH as if it were towed? No hooking up, no disconnecting, no extra length or weight on hills. With some sort of beacon on the MH for the car to follow, this seems like a much easier control problem than 'normal' auto pilot for an EV.


A true self-driving vehicle wouldn't even need to stay behind the motorhome - just program in the desired destination, and the vehicle would get there on its own.

Naturally, due to range limitations, it might need to meet you at designated charging stations along the way.


Agreed, with true self driving there would be no need to follow along.

My thought is that a follow on mode would be much easier to achieve than full self driving and gets away from some of the murky legal and liability issues with self driving vehicles. The technical challenges are far easier - just follow the huge MH in front of you and from a legal/liability issue the EV could be treated just the same way a towed vehicle.


If it's truly self driving and you miss your payments, does it drive itself back to the dealership? :-)


2020 F350 STX 6.7L Turbo Diesel
2020 FR Cedar Creek Silverback 29rw

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