Wang Hua responded to the Xiaomi SU7 brake failure: it was indeed misidentified by the software, and the small probability event has been fixed

IT House

2024-05-13 17:21Posted on the official account of Shandong IT Home

IT Home reported on May 13 that Wang Hua, general manager of the public relations department of Xiaomi Group, posted on Weibo today to respond to the Xiaomi SU7 brake failure: After verifying, it was indeed a misidentification of the software. At present, this small probability event has been fixed, and there is no need to panic.

Wang Hua said that he had asked engineers from the automotive department to help sort out the situation, and after analysis, it was confirmed that the system of the main brake controller (DPB/BCP) of the vehicle at that time misidentified the degradation to trigger the backup braking strategy, and the brake auxiliary controller (ESP/BCS) directly responded to the braking demand to provide brake deceleration for the vehicle; At the same time, the large screen of the vehicle also reported a fault prompt for the braking system.

During the process, the vehicle enters the braking system backup strategy, and the ESP extracts the DPB brake fluid to increase the braking pressure on the wheels to let the vehicle brake; As the brake fluid is withdrawn from the DPB by the ESP, the brake master cylinder pressure decreases rapidly, and the driver "lacks foot feel" when pedaling.

Because the braking system switches between primary and secondary, the original cylinder pressure value of the main brake is 0, but it does not mean that all braking force is lost, and the ESP intervenes in braking, and there is no complete failure of the braking system and loss of control of the vehicle.

Wang Hua said that the braking system of the SU7 is designed with DPB+ESP dual backup mechanism. In addition, he also disclosed part of the timeline:

In the early morning of May 9, the accident vehicle was rescued and towed to the Changsha Service Center, and the store staff checked the vehicle hardware to confirm that there was no mechanical failure/damage, and after operating the self-test program of the vehicle's braking system, the large-screen brake failure prompt disappeared and the vehicle returned to normal.

During the day on May 9, the store staff synchronously fed back the vehicle situation and technical conclusions to the user, and informed the vehicle inspection records and vehicle log data to be complete and verifiable. At present, the vehicle has returned to normal, but still based on the attitude of being responsible for the user, the staff said to the user that they can support the user's return/replacement demand, and at the same time cover the expenses incurred due to the return and replacement of the car (such as changing the car, the production will be prioritized according to the original order number, and the waiting period will be compensated).

In response to the problem that the 400 was not connected, Wang Hua said that because it was in the peak period of the incoming line at that time, there were many queues for the busy line, and the situation was not connected in time, and apologized for this; Subsequently, the user-only service group responded to the user's needs and arranged roadside assistance support. In response to the shortage of professional customer service agents, we have urgently launched recruitment in April, and it is expected that the pick-up rate of online customer service will increase significantly by the end of May. SOS is mainly a response channel for medical rescue of the injured in vehicle accidents, and the service is provided by professional platform organizations in the industry. The services in other car use scenarios are mainly provided by Xiaomi's after-sales service.

Wang Hua thanked the user for his feedback on the brake problem and called on netizens not to believe or spread rumors.

IT House Synopsis:

According to Red Star News, on the evening of May 8, Mr. Li from Leiyang, Hunan Province, drove a newly purchased Xiaomi SU7 car less than a month ago in the process of parking, the brakes were suspected to have suddenly failed, and an alarm sounded in the car, and 4 abnormal messages such as "braking system failure" appeared on the screen. After the vehicle came to an automatic stop due to the slow reversing speed, Mr. Li called the SOS emergency system in the car, but there was no answer for a long time, and an hour and a half later, local roadside assistance arrived to tow the vehicle back to the Changsha delivery center.

The strange thing is that after the car was sent for inspection, it suddenly "healed", and the after-sales service said that it could drive away at any time, but Mr. Li did not dare, he hoped to find out the cause of the vehicle failure.

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