Tesla Inc (TSLA)

[boston745]

Tesla China responds to Chengdu crash involving 11 vehicles

Another out of control Tesla tears down the road in China hitting 11 vehicles. November seems to be an interesting month for Teslas doing this in China.

Tesla’s China operations team on Monday denied that a technical failure was to blame for a crash on Nov. 25 in the southwestern city of Chengdu involving a speeding Tesla and 11 other vehicles; three were injured but no one was killed. An analysis of the car by the US automaker found the accelerator pedal had been pressed hard, increasing the vehicle’s speed from 54 kilometers (34 miles) per hour to 132 km/h at the time of the crash. Queried online in China about why the brake light was on but the car did not slow down, the company explained that the brake pedal was only applied two seconds after the initial hit when the brake was already damaged. The car owner surnamed Wang told Chinese media outlets that his new Tesla, registered the same day, accelerated suddenly and had been unable to stop.

Tesla has become very good at using truth to tell lies. Simply put Tesla is able to deny technical failure again and again because its data recorder records what the Tesla does while the driver claims he told his Tesla to do something else. Namely, the driver tells his Tesla to slow down by applying the brakes, as indicated by the brake lights somehow responding, but the Tesla continues to accelerate. But wait Tesla says, the brakes were only briefly applied but the accelerator was mashed to 100%. Isnt it odd how many Teslas speed off and the data recorder records 100%, or near to it, pressure? That the accelerator pressure doesnt let up for however long the incident occurs until the Tesla slams into something to stop it? Tesla would have us believe the driver is the one holding down the accelerator the whole time but this doesnt add up. However this has happened so many times that Tesla has to know there is a glitch in its cars just like it knows theres a glitch in autopilot software as indicated by a Florida judge recently. Hell ive been showcasing the EMI induced SUA problem for over 2 years with hundreds of cases, a case study about this out of China, and more recently a petition to the NHTSA.
Usually drivers try different things like stabbing the pedal, removing their foot from the pedal and trying the other one, or maybe applying the e-brake (this happened in an accident last year in China but the ebrake did not stop the drivers Tesla).

Whats the primary sign indicating an EV is suffering Sudden Unintended Acceleration?

4). Among the data records during the accidents according to the background data of the crashed vehicles or the data of on-vehicle terminals, the position values of most accelerator pedals were very high(99%) while the values of brake pedals were 0% or only non-zero in very limited moments (see Fig. 1 and Fig. 2).

Continued very high accelerator pressure with no braking is how you differentiate SUA from pedal misapplication just like what occurred in this accident. It just so happens that a petition submitted to the NHTSA indicates this can happen in Teslas too.
These incidents of SUA, according to the study, stem from electromagnetic interference. The voltage spikes that Dr. Belt observed in his petition, are likely the result of EMI.

Occasional fault of electronic control unit caused by  electromagnetic interference

External  electromagnetic  interference  refers  to  that  caused  by electromagnetic  radiation  of  various  electrical  facilities  including  the  high  voltage  transmission  line, broadcasting  TV  devices  and  radio  communication  equipment  as  well  as  natural  phenomena  such  as lightning.

Electromagnetic  wave  interferes  the  electric  control  system  of  automobile  through  wiring  harness and  car  body to  make  it  hard  to  perform  or  even  send  wrong  instructions leading  to  wrong  actions  of various  actuators,  affecting  the  safety,  reliability  and  stability  of  automobile  driving.  The electromagnetic  interference  affects  the  automobile  electronic  control  system  mainly  in  two  ways:  one is  to  affect  the  input  signal  of  the  sensor  of  the  electronic  control  system,  causing  distortion  and resulting  in  electric  control  signal  where  the  ECU  output  does  not  match  the  driver's  intention,  which leads  to  the  wrong  operation  of  the  actuator;  the  other  is  to  interfere  the  ECU  output  signal  to  result  in its deviation,  misleading the operation of  the actuator.

Petition shows Tesla Sudden Acceleration is Real

New information received by the NHTSA shows that sudden unintended acceleration events with Tesla EVs were real and not driver errors. The report explains in detail what caused the cars to accelerate even when the accelerator pedal was not pressed.

What's worse is that the incorrectly increased sensor signals will be sent via the CAN bus to the vehicle logs, causing Tesla and NHTSA to conclude that the driver caused the sudden increase in torque by stepping on the accelerator pedal. But in this case, the sudden acceleration was caused not by the driver stepping on the accelerator pedal but by a random superposition of a negative-going voltage spike (which is about 100 microseconds long), and the sampling time of the analog-to-digital converter (which is about 10 microseconds long). This random superposition explains the low occurrence rate of sudden acceleration in Tesla vehicles

Quote Sources:
1. 134. Nov 25th (0.620122, 104.067300)
https://technode.com/2023/11/28/tesla-china-responds-to-chengdu-crash-involving-11-vehicles/
2 & 3. https://www.researchgate.net/publication/346368508_Special_Investigation_and_Countermeasure_Suggestions_on_Electric_Vehicle_out-of-control_Accidents
4. https://www.autoevolution.com/news/breaking-nhtsa-petition-shows-tesla-s-sudden-unintended-acceleration-is-real-and-curable-217525.html