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Description

When regen braking is limited due to battery level or temperature, add limited mechanical brakes to supplement the regen braking.

Competitive/Pricing/Notes

This would result in a consistent driving experience regardless of the state of the battery. In addition, this could be used to provide a hold stopping mode for older vehicles that can’t fully stop with regen braking.

Status

Unknown.

(lightly edited by moderator)

rating;;3,2,4,0

rating;;3,3,4,0

0 comment

Description

Have an option to use only regen when Autopilot needs to brake, if safe to do so.

Competitive/Pricing/Notes

When you’re on autopilot or adaptive cruise control, and your car needs to come to a stop (either because there’s a slowing or stopped vehicle in front of you or it’s automatically stopping for a stop light/sign), I notice that the car appears to use the brake calipers in addition to regen braking (above 5 mph).

To increase the lifespan of the friction brakes, I prefer it to only use regen unless the other vehicle is stopping harder than expected.  Many times I’ll disconnect AP so I can manually use regen – meaning I’m starting the deceleration process sooner than the Tesla would.  I understand in my older Model S, it only regens down to about 5 mph so brakes would be required for a complete stop.

Status

Unknown.

(lightly edited by moderator)

rating;;3,2,4,0

rating;;3,3,4,0

0 comment

Not sure if they used all these ideas but regen is better in the cold now.

Description

In cold weather, make the car more efficient and perform consistently by using regen power more efficiently.

In cold weather (eg: less than about 40F, 5C), the battery can’t accept the high currents of normal regen.  Currently, this is addressed by making regen weaker depending on the battery temperature.  This makes the regen-braking force inconsistent and makes me use my brakes more (wasted energy).

When using regen braking, the power could optionally be used to heat the cabin.  Any power beyond the heating capability (limited by the power of the heater or suitable temperature-deviation from the user-set temperature) could be used to charge the battery.  If there is still power beyond that, it could go towards heating the battery up to temperature.  If all those uses are exceeded, only then would regen be limited.

Competitive/Pricing/Notes

Full-regen is about 70-50 kW.  The heater is about 4-6 kW, and the battery heater (ie motor-heating) is about 4-6 kW (only in the S/X, no battery heater in the 3) (note that while there is technically no actual battery heater for the 3, they send specially designed, inefficient pulses of power to the motor to heat the motor which is thermally connected to the battery; this is thus the equivalent of a ~4KW heater).  This may be only an incremental improvement but may increase range slightly, make the battery more efficient, and make regen more consistent.

Moderator:  Extending this idea a bit further, seats without passengers could have the seat heaters turned briefly on during deacceleration to consume a bit more power.

Status

Unknown.

(lightly edited by moderator)

 rating;;3,3,4,0

0 comment

Description

When releasing the accelerator, slowly come to a complete stop (but faster than the current design).

Competitive/Pricing/Notes

Currently regen stops at about 5 mph.  At that point this feature would lightly engage the friction brakes to come to a complete stop (if Creep feature off).

Several other cars like the Leaf and Bolt use use a PM motor. Due to inefficiency of the PM motor, a side benefit is it will slow to a stop on level ground.

Status

Unknown.

(edited by moderator)

rating;;3,3,4,0

rating;;3,3,4,0

0 comment

App Battery Warming

by Hausotter

Description

On the Tesla App, allow warming the batteries when charging power is present and the battery temperature is lower than the threshold for full regen.

Competitive/Pricing/Notes

This might be a safety feature because on icy roads without regen it’s a sudden change of driving behaviour. On very cold days (-5°C) it can take up to 50 km of driving until regen is 100% available if you have charged outside a garage before. And braking energy is lost in winter.

Status

Unknown.

(edited by moderator)

rating;;3,3,4,0

rating;;3,3,3,0

0 comment

Description

Improve traction control and regen to better handle icy road conditions where max regen may cause the back-end to slide out.

Competitive/Pricing/Notes

From what I’ve heard, regen on icy roads can cause the car to become unstable and let the back end break out (like when using the handbrake on a regular old car). People are advised to only use “low” regen to avoid this. I thought this was very strange: why can’t traction control limit regen when the back starts to break out? Did Tesla just buy a standard ESP package for normal cars that does not know how to handle regen? So my feature suggestion is reprogramming the traction control so that it can handle problems with regen. Electronic stability should work in any circumstances, including when using regen. If the car can release the brakes and even brake individual wheels, shutting off regen to stabilize the car should be easy.

Status

Moderator: We don’t know if this is a real problem or not, having never experienced the issue, and it sounds like the submitter hasn’t either.  On total ice, it’s not clear that any system short of chains will help.

(lightly edited by moderator)

rating;;2,2,4,0

0 comment

Brake Light Hash Indicator

by donsch

Description

As most probably know, regenerative braking causes the brake lights to come on at varying points depending on speed.

I would like a little red hash mark on the edge of the dial to indicate the point when the brake lights will come on.  At which point the hash should glow a brighter red while brake lights are on.

The reason for this is I’m sure we are all unknowing “brake checking” people which can be a source of road rage.  If I knew exactly when the brake lights would come on, I would only regen just shy of activating the brake lights in most cases.

This feature would help Model S drivers be more aware of what their car is saying to the drivers around them.

Competitive/Pricing/Notes

Moderator: We don’t believe this feature is technically possible. The brake lights come on at a specific g-force, and has little to do with speed. While regeneration has some relation to g-force, it’s also not direct. For example, you could have major regen going down a hill, yet insufficient g-forces to trigger the brake lights.

Status

Unknown.

rating;;2,1,4,0

0 comment

Description

When driving at highway speeds with the cruise control on, maintaining speed should be smoother and slower.

When cruise control is overridden (to pass someone), turned off, or the cruise speed is changed incrementally, the Model S should not be so aggressive with Regen and acceleration.  A smoother shift to the desired speed is better.

Competitive/Pricing/Notes

Very little cost:  when cruise is engaged, regen profile should flip to low. When cruise control is turned off,  it would wait for 2-3 seconds and/or when the accelerator pedal is depressed to return the regen to the previous user user-selected setting.

Status

Over time, this has been improved to the point (early 2014), that we’re considering this implemented.

rating;;3,4,4,1

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