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Multiple Speed Transmission

by foxkill

Description

The Model S should offer an option for a auto or manual multi-gear transmission not just one single gear.  A five or six speed gear box might mean a more efficient and faster car.

Competitive/Pricing/Notes

A tranny might also allow Tesla to use a smaller electric motor since it wouldn’t have to turn such a large gear, this may improve range and efficiency.  Auto makers like Detroit Electric and  Brammo motorcycles have already incorporated  six speed transmissions in there vehicles and Brammo explains why they don’t use a single speed gearbox https://www.youtube.com/watch?v=WzGaDIMlOy4

The Model S is a great car but if its gonna be competing with the big boys the single speed gearbox doesn’t seem the way to go.  If you watch any race with the model S it usually wins when the other car is about to pass with it after they leave the starting line.  This seems due to the one speed gearbox, it has extremely acceleration up to about 95mph and then falls flat.    Also a transmission would reduce the rpm’s of the motor during highway drives therefore improving range

Editor: This would add weight, cost, and complexity to the existing system, and consume some luggage space.

Status

Unknown.

rating;;1,1,1,0

0 comment

Description

Pretty simple…perfect for EV controls: if I put the car in D it means do NOT go backward, even if I’m on a hill, strong wind or big fat guys are trying to push my car in a direction I do not want it to go!

Competitive/Pricing/Notes

Pretty common in other cars.

Status

Available with version 5.9+ software.

rating;;3,4,4,1

0 comment

Static Cruise Control

by Jerry

Description

My Mercedes will maintain the speed I set in the cruise control even if going downhill. So if I select 75 MPH on the cruise, it maintains that exact speed uphill and downhill so I don’t have to worry about getting a speeding ticket. Since Tesla buys the steering wheel stalk to control the cruise control from Mercedes, all it would take is a reprogram to apply the brakes when necessary. Description

Competitive/Pricing/Notes

Shouldn’t cost anything other than the labor for a computer programmer.

Status

Unknown.

rating;;3,2,3,0

rating;;3,3,3,0

0 comment

Description

Currently there are only two regen settings, and due to the complexity of changing them on the touch screen, it’s almost impossible to safely change them while under way.

My Chevy Volt also has two settings, but they are easy to select while driving. It’s quite fun and useful to do so, much like downshifting.  The ideal scenario would be a system like the Volkswagen e-Golf, which has paddle-shifters on the steering wheel that select four different regen settings. Leave it to the Germans to achieve the ideal when it comes to driver involvement.

Even better would be a steering-wheel-mounted thumbwheel that would infinitely vary the regen, much like the pitch-trim controls on aircraft.

Competitive/Pricing/Notes

Software change, no cost

Status

Unknown.

rating;;3,2,4,0

0 comment

Description

When regen “kicks in” it is more abrupt than (for example) the smooth ramp implemented for the accelerator.  At the risk of being too technical, the 3rd and 4th derivatives of position-vs-time should be smoothed/reduced to eliminate a bit of the “regen jerk”.

Competitive/Pricing/Notes

Software implementation may be complex, but should be a no-cost improvement.

Status

Implemented in version 4.2 software.

rating;;2,3,4,1

rating;;3,3,3,0

0 comment

Description

All Wheel Drive for better traction in poor conditions (Snow, Rain, mud, etc.).  It is understood this may reduce range (due to weight and extra power needed), so it should always be an option for those who want it and are willing to pay for the extra costs.

Competitive/Pricing/Notes

A 2013 Audi A6 offers AWD as a $2200 option. AWD on a ICE car has little relation to the mechanics and design on a electric car, so competitive pricing may not be relevant.

Status

A dual motor AWD option was announced in October 2014 for delivery in December 2014. This added both performance and range. All Model-X vehicles will be AWD.

rating;;4,4,2,1

rating;;3,3,3,0

0 comment
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