3MIDDOT; 15 On the eve, Tesla brakes failed to be boiled, I believe that everyone knows that things have passed, and we don’t have to repeat it. In short, there is a car owner say that Tesla brakes fail, causing crash; Tesla is responding, because the owner is insufficient to step on the pedal, and the ground is slippery, leading to the brake distance.
The picture shows Tesla responded to the matter
The main owner responds
[ 123] After two days of public opinion, many media, large V even individuals have stated that there are blowers, and there are also squats, and there are also persuasion, not lively.
Make a professional new energy medium, we don’t have a team today, just rely on existing information and professionalism, give you the reason for the cause of Tesla.
First we have to clarify a problem, encounter such “brake pedal to stepping” problem, the reason is basically only two, one
is the brake help, the other is the ABS calibration problem.
First look at the brakes to help, this is actually very well understood, the brake helps do not force, and the same stepping efforts will lead to the brake “fail”.
Tesra used the brake boosting mechanism for Bosch’s iBooster, which is an electronic boosting agency. If the traditional vacuum help is “step on a force”, then this electronic system is “Stepping an Electric Acference”, as for how much the help is, it is determined by the car.
Therefore, the iBooster can implement the braking mode selection function in the driving mode selection. If the model provides a variety of driving models such as motion, comfort, economics, iBOSTER can control the sensitivity of braking (tap brake pedal to achieve strong braking force, or fierce the pedal to achieve the required system). It is also possible to efficiently recover the braking force. With the Bosch’s ESPHEV system, the energy recovery of 0.3 g of deceleration can be achieved, so that the battery life of the electric vehicle is increased by 20%.
Therefore, new energy cars like iBOSTERs so it is also true.
IBOOSTER entered the public’s field of view and thanked Cr-V, and when CR-V was recalled because of the “brake failure” recall, “due to supplier design reasons … In the vehicle driving, misjudgment, thus start Brake Backup Mode “All Pot Ibooster.
The BMW has also been called because IboSter recalls, and BMW said it was because IBOSTER’s motor welding has been issued, causing the system to report an error and enter failure mode, and lose help.
Ideal One is also pitted, and the ideal one is used by the Bosch’s iBooster II brake system. For this matter, the official interprets the communication failure of electronic components, belongs to rare examples.
For several events, we found that the reason for the IBOSTER fault is different, and the vendor is a certain right to adjust the IBOOSTER, for Tesla Highly automatic driving models, they are definitely a depth adjustment to iBooster. So if Tesla is also because of iBOSTER’s question, we can’t speculate in the end of the Bosch, or Tesla’s problem before the official results came out.
This picture is only used as ridicule, not to indicate that the electric powered station team Bosch
However, the car does not completely lose brake capacity, As long as you strive to step on, the car can also be braked, for example, the fuel car flashed can also step on the pedal.
Next, we look at the situation of ABS calibration.
Although ABS is a very common car configuration, it has taught users even in the driving school department, but we believe that many people are still a half solution.
ABS can prevent wheel lock (slipping only without rotation, can cause the car to lose steering ability or side sliding tail leading to out of control), so it is generally vigorously stepped on the brake or icing,Snow, gravel, bumps, railway tracks, loose rock formations are started.
The slip ratio refers to the proportion of sliding components in the wheel movement
There are many people who think that in this low speed, the road is not too In the case of slippery, ABS will not start.
The above picture shows the incident road condition, and the image from the owner’s response article
But Tesla’s response said that ABS is started, so It is possible that Tesla’s ABS has a problem with the calibration of low speed and low adhesive pavement, which leads to the same case of the brake distance to be longer than other brand vehicles.
Since we are not ABS calibration expert, here is here to know the answer to the master @ 菲 的 回::
“The principle of ABS system work is to control the angular acceleration and slip rate of the tire The event site is obviously non-paving pavement. This loess pavement is equipped with a small gravel. We call Sandstone. There is an analog road in the test site. The attachment coefficient is about 0.5, which is half a bitteen road. Therefore, if you do not do special treatment, the same initial speed, the braking distance is doubled. “
In the ABS calibration, in addition to the uniform pavement, it also involves separating the road surface (the left asphalt side of the vehicle) Or opposite to the pavement (from asphalt to ice or opposite), the chessboard road (extremely high-grab force and extremely low grip pavement alternate), Negus (all way to the separation road), rough road (rail / speed tape / sea door Test of road / sine wave / sand / stone road …). Each wheel will target a specific road condition and optimize to cover all the conditions that end users can encounter. 
And the name of “Haim Road” in these test pave is also very interesting, it is said to be because ABS calibration work has just entered China, and a project is here to pay the boat, no brake, hit. Although ABS has experienced many iterative evolution, it has experienced many iterative evolution, but the road of Haimen Ferry is the first time, so it is named “Haimen”.
In fact, Tesla is capable of calibrating and taking an ABS, before, TeslaThe brake distance was shortened through OTA. Many people think that it is OTA’s great victory, and some people think it is “funeral”, but, since Tesla, Since Tesla, since the mainsthot-automatic driving and top electronic electrical architecture, it is certain that the underlying control of the vehicle And data.
It is also no wonder that there is a host factory to say that Tesla will step on the fuel car, one to step on it.
■ State Review
The above is the view of the electric state to Tesla brake door event. We don’t want to wash the land, after all, they have no public relations costs. Give us; don’t want to question the owner’s statement or practice, after all, there is no people to suffer from others, please advise others to be good. I also hope that all media peers can be rationally explored, and less rhythm.
Finally, I said that even if Tesla is clear and white, it is too stupid to write “4Times; 2 pre-drive” on the test report. It is really awkward. Host mills really have to be a ring, do you think that consumers and media are stupid? No, everyone is holding a magnifying glass to see you!