MarcG
Active Member
Thanks for taking the video and posting it! I'll try it again in a bit but that's pretty much how I was trying to engage it.
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Oh that is too funny.
But 200ms is minuscule... From a standstill the inverter output is at the lowest possible frequency, it probably takes a few cycles to get to full power, the time is probably significant compared to 200ms. Plus probably 100ms saved from getting the accelerator to the floor.Glad I'm not the only one that got a kick out of this.
Pretty sure at best "Launch Mode" will shave the minuscule time it takes to fully depress the go pedal. Just a theory, but, I don't see how it would improve beyond that. There is no kinetic energy built up for launch in an EV like it would for an ICE with launch control...
But 200ms is minuscule... From a standstill the inverter output is at the lowest possible frequency, it probably takes a few cycles to get to full power, the time is probably significant compared to 200ms. Plus probably 100ms saved from getting the accelerator to the floor.
Glad I'm not the only one that got a kick out of this.
Pretty sure at best "Launch Mode" will shave the minuscule time it takes to fully depress the go pedal. Just a theory, but, I don't see how it would improve beyond that. There is no kinetic energy built up for launch in an EV like it would for an ICE with launch control...
I disagree. I can see at least 4 places in the car where this will save time.
1. Go pedal travel time. This is replaced by brake pedal release time instead, thus the only time saved will be the difference between the two. Probably the smallest gain.
2. Torque is already built up in the axles. The axles elastically deform under high torque, and it takes time for that torque wind-up to build in the axle before the torque being produced at the induction motor's rotor can reach the wheels. The launch mode will allow this torque wind-up to be pre-loaded, resulting in all torque produced at the induction motor rotor to already be transmitted to the wheel hubs.
3. Reduction gear lash is already taken up. This is not only the small clearances between gear teeth, but also torque deformation in the gears and splines.
4. I think this one is probably the most important. You have already established magnetic fields in the induction motor stator and rotor. The stator and rotor are magnetically permeable cores, and therefore have an inductance. Building current in them takes time because back-EMF resists the change in current. By pre-establishing the stator's rotating magnetic field and the induced rotor currents, you bypass this build-up time.
This is also why you only have 4 seconds to launch the car. The power going into the motor that is pre-loading everything is being 100% wasted as heat until the launch occurs, so you are heating the stator and the rotor pretty heavily. After 4 seconds, the temperature will have built up and you need to either launch or stop current flow.
We need to see an instrument cluster view of a launch mode with the Energy App displayed. I'd like to see how much power is being sent to the motors before the brake pedal is released.
I have an ICE with north of 600 hp stock and have never used the launch mode..... The thing either goes as I drive it every day or it does not. I must be ole fashioned.
Very nicely done Tesla.
Very nicely done Tesla.