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How does the semi automatic transmission work.

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Philspanner

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Although not a true automatic. Can anyone tell me how the coupling is achieved. I was told it was by wet clutches. I am familiar with torque converters, fluid couplings, electromechanical and mechanical clutches.
My only guess is sintered bronze clutches, similar to the early British Leyland mini and controlled by high frequency solenoid that metered oil pressure, to achieved a slip engagement.
My interest in the subject is purely a need to understanding machines.
Thank you . Phil.
 
Last edited:
Philspanner said:
Although not a true automatic. Can anyone tell me how the coupling is achieved. I was told it was by wet clutches. I am familiar with torque converters, fluid couplings, electromechanical and mechanical clutches.
My only guess is sintered bronze clutches, similar to the early British Leyland mini and controlled by high frequency solenoid that metered oil pressure, to achieved a slip engagement.
My interest in the subject is purely a need to understanding machines.
Thank you . Phil.
Click to expand...

In simple terms, it is the same clutch as a normal setup. The gearbox is the same also. The clutch is rpm and pressure dependent. The plates are typical friction plates, runs wet and uses a judder spring to smooth the release. The bar mounted shiftlever should be unloading the engine and bumping the shift solenoid to move the shift shaft.

Basically, a really fancy pull rope mini bike or for comparison, similar to an off-road bike with a Rekluse clutch, but the Rekluse maintains the shift lever.

PK
 
SE semi automatic & SM manual transmission

Here are two posts I put in some time ago. Maybe this will help.

First post:
The SE is not an "automatic" transmission. The transmission is the same as the SM -- a manual transmission with a conventional motorcycle-type multiplate wet clutch. The difference is that BRP designed an automatic clutch control system and shifting system to shift the manual transmission. They also added a centrifugal clutch mechanism to keep the clutch disengaged at idle when not moving. Conventional thinking and experience with "automatic" transmissions does not apply. If you downshift the SE or downshift the SM, you are doing the same thing and with the same results.

Second post:
The clutches for both SM and SE's are essentially the same -- multi-plate wet motorcycle clutches. The centrifugal part of the SE arrangement is a centrifugally actuated mechanism that disengaged the conventional multi-plate clutch when the rev's dropped low such as when you were stopped and the engine is idling. For normal shifting, the clutch operation was not centrifugal but was operated by oil pressure and control solenoids that would quickly disengage the clutch perfectly synchronized with the shifting solenoids to get the next higher or lower gear. The 2014's did away with the centrifugal mechanism for the SE's and use computer programming to gradually engage the clutch from a standstill so you get a smooth start without stalling the engine or without excessive clutch slipping. The same way the automotive "dual clutch" transmissions do.
 
gypsy_100 said:
Here are two posts I put in some time ago. Maybe this will help.

First post:
The SE is not an "automatic" transmission. The transmission is the same as the SM -- a manual transmission with a conventional motorcycle-type multiplate wet clutch. The difference is that BRP designed an automatic clutch control system and shifting system to shift the manual transmission. They also added a centrifugal clutch mechanism to keep the clutch disengaged at idle when not moving. Conventional thinking and experience with "automatic" transmissions does not apply. If you downshift the SE or downshift the SM, you are doing the same thing and with the same results.

Second post:
The clutches for both SM and SE's are essentially the same -- multi-plate wet motorcycle clutches. The centrifugal part of the SE arrangement is a centrifugally actuated mechanism that disengaged the conventional multi-plate clutch when the rev's dropped low such as when you were stopped and the engine is idling. For normal shifting, the clutch operation was not centrifugal but was operated by oil pressure and control solenoids that would quickly disengage the clutch perfectly synchronized with the shifting solenoids to get the next higher or lower gear. The 2014's did away with the centrifugal mechanism for the SE's and use computer programming to gradually engage the clutch from a standstill so you get a smooth start without stalling the engine or without excessive clutch slipping. The same way the automotive "dual clutch" transmissions do.
Click to expand...


Great post. :thumbup:

.
 
The SE5 is an computer controlled with hydraulic shifting and clutch control using the SM5 transmission. It uses things like engine speed, mph, clutching, and keeping track of what gear your in and much more. It's one of the better systems I have seen. If you want more information buy a workshop manual and read up on it. For me to sit down and explain the system, we would need a few hours to show you how it works. That's about the best I can do online.


Mike
 
A CLUE

SNOOPY said:
What's a Scotty?

Isnt that an English dog?
Click to expand...

SCOTTY.....doesn't the name give you some sort of clue ?

A short lesson, Great Britain/United Kingdom is made up of four countries, England, Scotland, Wales & Northern Ireland.

Now it's homework time.

Where does a Welsh border collie come from ?
Where does an Old English sheepdog come from ?
Where does an Irish wolfhound come from ?

Answers on a postcard please.
 
NZSpyderRyder said:
SCOTTY.....doesn't the name give you some sort of clue ?

A short lesson, Great Britain/United Kingdom is made up of four countries, England, Scotland, Wales & Northern Ireland.

Now it's homework time.

Where does a Welsh border collie come from ?
Where does an Old English sheepdog come from ?
Where does an Irish wolfhound come from ?

Answers on a postcard please.
Click to expand...

What should we have expected from a "Beagel"? :dontknow: :D
 
NZSpyderRyder said:
SCOTTY.....doesn't the name give you some sort of clue ?

A short lesson, Great Britain/United Kingdom is made up of four countries, England, Scotland, Wales & Northern Ireland.

Now it's homework time.

Where does a Welsh border collie come from ?
Where does an Old English sheepdog come from ?
Where does an Irish wolfhound come from ?

Answers on a postcard please.
Click to expand...


Engalnd
Scotland
Iceberg
Goldberg

Whatever

From this side of the pond, no difference in. England and Scotland. :roflblack:


Hope that English guy doesn't see this...or is he Scottish? :shocked:

.
 
Dogs?

NZSpyderRyder said:
SCOTTY.....doesn't the name give you some sort of clue ?

A short lesson, Great Britain/United Kingdom is made up of four countries, England, Scotland, Wales & Northern Ireland.

Now it's homework time.

Where does a Welsh border collie come from ?
Where does an Old English sheepdog come from ?
Where does an Irish wolfhound come from ?

Answers on a postcard please.
Click to expand...

Most come from the local Animal Shelter
 
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