- #1
CorvetteAB
- 17
- 0
Hello friends,
My team is working on a hybrid bolt on setup for a competition. We will be given a 110cc, CVT driven scooter (producing 7.80 bhp @ 7,500 rpm and 8 Nm @ 5,500 rpm). This is the scooter- https://www.bikewale.com/tvs-bikes/..._kKbSX6goR4u50g2XY4mjq9SqVcNjmKu-9hoCzD7w_wcB
also, https://www.tvsjupiter.com/techspec
(Competition is organised by SAE India in association with TVS)
We have come across quite a few problems, and since we are all new to this, we aren't able to solve it, so I thought I would ask here.
1-- Does mating an electric motor to a CVT reduce its efficiency? What transmission would you suggest?
2-- Why do motors often use direct drive? (single gear ratio) Or do they?
3-- Is it possible to couple the 2 power sources (engine+ motor) using any transmission? How would planetary transmission work? Is there a way?
4-- How are the power and torque characteristics of an electric motor? Is it like constant torque throughout the RPM and max power at max RPM, or otherwise? (I could be wrong)
5-- The rules state that power during electric motor mode should NOT go to the engine crankshaft. So, we have decided to add an electromagnetic clutch at some point in the CVT where centrifugal clutch is located (so that when in EV mode, if we use direct drive to rear wheel, we don't have to worry abour CVT running alongside and reducing efficiency). Thing is, we aren't sure of how it would work out, and if it would even work in the first place, because CVT is a tight fit, and messing with it is risky, given our limited budget. Any idea whether it would work?
And does anybody know any other ways of disengaging power?
Thanks in advance.
My team is working on a hybrid bolt on setup for a competition. We will be given a 110cc, CVT driven scooter (producing 7.80 bhp @ 7,500 rpm and 8 Nm @ 5,500 rpm). This is the scooter- https://www.bikewale.com/tvs-bikes/..._kKbSX6goR4u50g2XY4mjq9SqVcNjmKu-9hoCzD7w_wcB
also, https://www.tvsjupiter.com/techspec
(Competition is organised by SAE India in association with TVS)
We have come across quite a few problems, and since we are all new to this, we aren't able to solve it, so I thought I would ask here.
1-- Does mating an electric motor to a CVT reduce its efficiency? What transmission would you suggest?
2-- Why do motors often use direct drive? (single gear ratio) Or do they?
3-- Is it possible to couple the 2 power sources (engine+ motor) using any transmission? How would planetary transmission work? Is there a way?
4-- How are the power and torque characteristics of an electric motor? Is it like constant torque throughout the RPM and max power at max RPM, or otherwise? (I could be wrong)
5-- The rules state that power during electric motor mode should NOT go to the engine crankshaft. So, we have decided to add an electromagnetic clutch at some point in the CVT where centrifugal clutch is located (so that when in EV mode, if we use direct drive to rear wheel, we don't have to worry abour CVT running alongside and reducing efficiency). Thing is, we aren't sure of how it would work out, and if it would even work in the first place, because CVT is a tight fit, and messing with it is risky, given our limited budget. Any idea whether it would work?
And does anybody know any other ways of disengaging power?
Thanks in advance.