So what's wrong with Tesla's brake system?
Note: NHTSA (National Highway Traffic Safety Administration) is not only a testing agency, but also the highest authority in charge of vehicle safety of U.S. government departments and the authority of vehicle supervision of U.S. government departments.
Note: Dr. Ronald A. belt, an American engineer with more than 40 years of experience in the electronics industry, has been studying the unexpected acceleration of vehicles since he retired from Honeywell in 2011,More than ten reports have been published.A 66 page technical analysis of Tesla's unexpected acceleration was published in 2020.
There are also some interesting data details in the NHTSA findings.
According to all the accident data,
(EDR and log data of a typical case in ODI survey, from top to bottom are speed, accelerator pedal position, brake pedal and brake master cylinder pressure)
Most interestingly, about 51% of the accidents occurred when the person was driving Tesla for less than six months.
Note: Tesla brake system adopts ibooster of Bosch
Firstly, if the battery power supply is insufficient, the braking system will work in an energy-saving mode to reduce the unnecessary load of the vehicle electrical system and prevent the failure of the on-board power supply; secondly, if the braking system fails, esp will take over and provide braking assistance. (ESP is different from ABS. ABS can only work with pedal input, esp can work without pedal input.)
In both cases, the braking system can provide 0.4g deceleration under the action of 200N pedal force.
If the system fails, that is, in the power-off mode, the driver can apply the wheel brake to all four wheels through the pure hydraulic mode without brake assistance to make the vehicle stop safely.
In addition to these, Tesla has two mechanisms to ensure the safety of the brake.
Of course, if all the electronic components are faulty, and the driver brakes according to the usual braking force, the braking distance may be long, or even the car may not be able to stop.
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