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Replies to post #91858 on Tesla Inc (TSLA)
According to the DA, Zhang told investigators he tried stopping, but the breaks in his Tesla did not respond. Verifying that claim will take time.
"That requires a significant vehicle inspection, generally done by the manufacturer of the vehicle," Jenkins said. "It requires accident reconstruction. We need to figure out how fast he was going and a download of the black box that was in the vehicle."
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.
In an interview with local news outlet Dahe Daily, the 55-year-old driver, Zhan, who said he was a former truck driver, said he tried pressing the brake pedal and the emergency parking brake button, but with no effect
Tesla China denied the family member’s claims, noting that data from the ill-fated Model Y showed that the accelerator pedal was depressed deeply during the incident. Tesla stated that the Park button was indeed pressed during the vehicle’s final drive four times, but only briefly. Previous tests from Tesla owners indicated that pressing Park for an extended period of time while the vehicle is in motion would stop the car
The National Highway Traffic Safety Administration (NHTSA) has reopened its investigation into a potential design flaw in Tesla vehicles, which may lead to sudden unintended acceleration. This comes after allegations were made that a voltage spike deep within the control systems could cause the vehicle to incorrectly read an accelerator input, even when none has occurred.
When Voltage Spikes Trigger Unintended Acceleration
Under certain circumstances, such as slow driving, when the power steering requires more power, the draw on the 12-volt battery can cause a significant spike in the system. This voltage surge could lead the inverter to incorrectly conclude that the accelerator pedal has been pressed, resulting in unintended acceleration.
This unexpected acceleration could theoretically happen when a voltage spike, lasting only microseconds, occurs simultaneously as the car performs an ADC check, also lasting microseconds. Belt suggests that the frequency of these events aligns with the 200 or so incidents reported between 2013 and 2019.
Adding complexity to this issue, Belt contends that due to the nature of the fault, it does not get logged as an error. The inverter’s misinterpretation of a voltage spike as a throttle input leaves no trace, leading to discrepancies between Tesla's vehicle data and owners' accounts, possibly explaining why the ODI initially denied the petition.
While Belt's allegations primarily focus on the Model 3, which features a unique inverter design, he notes that similar errors could occur in Model S and Model X vehicles. This opens up the potential for a broader scope in the ongoing investigation.
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
E3 can also affect subtransmission and distribution systems by causing harmonic distortion and voltage depression. The voltage regulators at the substation will attempt to correct for low voltage levels on distribution circuits. This attempt can result in overvoltages when the E3 stimulus decays to a low value
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).
In recent years, there have been numerous out-of-control accidents of electric vehicles.
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.
The most common cause of Natural EMI includes:
Lightning
Solar Magnetic Storms
Earth’s Magnetic Field Flux
Cosmic Radiation
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