Hi There,
There is a disturbing trend of crashes with Model 3 /Y losing control last few month...
First one was in Paris in december 2021...
Second one a Tesla Model Y in China 3 month ago
Then last month here again in China, very similar to the incident which happened with the model Y few month ago :
- In all case drivers are saying the car accelerated by itself (Paris/China) and that braking did not have any effect.
- In all cases drivers are trying to avoid traffic, so they are not trying to kill themselves...
- In all cases it looks like the cars are accelerating full speed
- All cars to my knowledge were MIC (Made in China)
- In all cases no real investigation results from Tesla... Which is a little disturbing in my opinion...
Possibilities :
- Inverter failure : Not likely IMO, usually when inverters (VFD) fails they just burn and you loose all output power on async or sync ... I have yet to see a servo controller or a regular VFD fail with motor running full speed...But this may be possible....In this case normally brake power should be enough to stop the car, unless there is a brake master cylinder failure at the same time...
- Brake master cylinder failure : possible but car would not accelerate. Tela uses Electric master cylinder than can apply brakes by themselves. Brake pedal will be extremely hard to press in case of failure but it should work, unless the electric assist gear brake and seize the whole master cylinder. Not sure if it is possible and should be part of considered failures in the design.
- Throttle sensor : there are normally 2 tracks for throttle sensor position. It would require the 2 track to be bad and show full throttle to get this behavior... When one is bad or discrepancy above few % this create a CEL and you have no power.
- General failure on CAN BUS throwing bad data ??
- Software bug ??
I still have hard time believing people saying that this is a driver mistake and they took the throttle for the brake for so long. The guy in Paris was a Taxi driver... On my end I could never do something like that on a 2 pedal car (I'm an decently fast AutoX and Roadcourse driver). Even on a not so skilled driver, the pedal issue would last just 1s-2s max before realizing.
I'm leaning towards something fishy guys, those incidents are too much alike ... Issue with Tesla having no communication department is that we may never know until way more incidents happen or a institution forces them to answer.
To note that Datalogs may show no issues, does not necessarly mean there isn't one.
Do we have similar stories with MIUS Tesla ?
There is a disturbing trend of crashes with Model 3 /Y losing control last few month...
First one was in Paris in december 2021...
Paris taxi firm suspends use of Tesla Model 3 cars after fatal crash
Tesla denies any technical problem with car as authorities investigate crash that killed one person and injured 20
www.theguardian.com
Second one a Tesla Model Y in China 3 month ago
Then last month here again in China, very similar to the incident which happened with the model Y few month ago :
- In all case drivers are saying the car accelerated by itself (Paris/China) and that braking did not have any effect.
- In all cases drivers are trying to avoid traffic, so they are not trying to kill themselves...
- In all cases it looks like the cars are accelerating full speed
- All cars to my knowledge were MIC (Made in China)
- In all cases no real investigation results from Tesla... Which is a little disturbing in my opinion...
Possibilities :
- Inverter failure : Not likely IMO, usually when inverters (VFD) fails they just burn and you loose all output power on async or sync ... I have yet to see a servo controller or a regular VFD fail with motor running full speed...But this may be possible....In this case normally brake power should be enough to stop the car, unless there is a brake master cylinder failure at the same time...
- Brake master cylinder failure : possible but car would not accelerate. Tela uses Electric master cylinder than can apply brakes by themselves. Brake pedal will be extremely hard to press in case of failure but it should work, unless the electric assist gear brake and seize the whole master cylinder. Not sure if it is possible and should be part of considered failures in the design.
- Throttle sensor : there are normally 2 tracks for throttle sensor position. It would require the 2 track to be bad and show full throttle to get this behavior... When one is bad or discrepancy above few % this create a CEL and you have no power.
- General failure on CAN BUS throwing bad data ??
- Software bug ??
I still have hard time believing people saying that this is a driver mistake and they took the throttle for the brake for so long. The guy in Paris was a Taxi driver... On my end I could never do something like that on a 2 pedal car (I'm an decently fast AutoX and Roadcourse driver). Even on a not so skilled driver, the pedal issue would last just 1s-2s max before realizing.
I'm leaning towards something fishy guys, those incidents are too much alike ... Issue with Tesla having no communication department is that we may never know until way more incidents happen or a institution forces them to answer.
To note that Datalogs may show no issues, does not necessarly mean there isn't one.
Do we have similar stories with MIUS Tesla ?