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Replies to post #83510 on Tesla Inc (TSLA)
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.
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).
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.
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
