Xiaomi SU7 Max Winter Tests

Q: 01 Where was the ice – snow handling and stability test of the new Xiaomi SU7 that everyone saw recently carried out? What model was used?

A: The test site is located in Hailar District, Inner Mongolia Autonomous Region. During the test, it coincided with a cold wave, and the temperature dropped to – 39°C, which is very close to the “extreme cold” standard of – 40°C. The test used a new – generation SU7 Max test vehicle with snow tires. Through a comprehensive verification of the overall vehicle’s comprehensive performance, after the new – generation SU7 is launched and mass – produced, it will bring everyone a more composed, precise and stable driving experience.
Q: 02 Is it necessary to change to snow tires when driving in cold areas? What’s the difference between snow tires and ordinary summer tires?
A: If the winter temperature in the area where you are is cold and the probability of snowfall is high, it is recommended that you change to snow tires in time, which is more conducive to ensuring your driving safety. Snow tires are specially developed for winter road conditions. They have a more suitable rubber formula and tread pattern design for ice and snow roads. Therefore, the vehicle equipped with snow tires has better grip on ice and snow roads than the vehicle equipped with summer tires. The rubber materials used in summer tires will have their performance decreased in low – temperature environments. Even on non – ice and snow roads in cold climates, the performance of summer tires will also decline. Therefore, we recommend that you equip your vehicle with suitable tires according to different seasons and road conditions. In addition, please note that the specifications of the winter tires to be replaced must be the same as the original factory (which can be queried in the “Vehicle Details” in the Xiaomi Automobile APP), and all four wheels must use the same brand, structure and tread pattern, and choose products with an international snowflake logo, which can remove snow more quickly and prevent slipping in extremely cold areas.
Q: 03 Should the “Wet – Slip Mode” be kept on all the time on snow – covered roads in winter?
A: When you are driving on wet or icy and snowy roads, we strongly recommend that you switch the driving mode to the “Wet – Slip Mode” to enhance driving safety. After entering the “Wet – Slip Mode”, the system will adjust the power output during starting and acceleration to be more gentle, make the torque distribution between the driving wheels more balanced, adjust the energy recovery force to be softer, and the ESP (Electronic Stability Program) body – stability control system will intervene earlier and more actively. In the Wet – Slip Mode, the vehicle is less likely to “fishtail” when passing through a water – logged curve in the rainy season. Therefore, compared with other driving modes, the “Wet – Slip Mode” can make acceleration on wet and slippery roads smoother, turning more controllable, and braking more anti – skid, allowing you to drive more calmly and safely on icy and snowy wet and slippery roads. In addition, please note that the Xiaomi HAD (Highway Assistant Driving) function will not be available in the “Wet – Slip Mode”. It is recommended that you stay focused on driving and drive slowly and steadily.
Q: 04 Why conduct extreme cold driving control tests? What’s the use of these tests for me?
A: Every winter, snowfall, cooling and icing will make the roads wet and slippery, resulting in a sharp increase in driving safety hazards. Therefore, this time, we simulated the common wet and slippery road conditions and dangerous scenarios in winter vehicle use in an ice – snow environment of – 39°C through tests to verify the handling stability and driving safety of the new – generation SU7, so as to provide better safety guarantees for users’ winter driving. The following is a detailed introduction of the difficulties of each project and the performance of the new – generation SU7 one by one:
Icy roads: When the vehicle is driving on ice – snow roads, the tire grip decreases significantly, which will lead to more prone to skidding during acceleration, and the tires are more likely to lock during kinetic energy recovery and braking, causing the vehicle to lose control; The new – generation SU7 can start smoothly on thin ice roads, accelerate to 60km/h smoothly without fishtailing.
Emergency obstacle avoidance: When driving in winter, due to the wet and slippery roads, the probability of encountering road obstacles such as snow piles and faulty vehicles increases. In such cases, it is necessary to turn the steering wheel to change lanes to avoid obstacles. However, due to the wet and slippery roads and the violent transfer of the vehicle’s center of gravity, it is more likely to lose control or fishtail during continuous lane – changing, causing danger; The new – generation SU7 can also respond quickly on ice – snow roads, with a controllable trajectory, complete obstacle avoidance smoothly and return to the lane steadily.
Ice/snow/asphalt mixed roads: After snowfall in winter, due to reasons such as few vehicles driving and incomplete snow – clearing on some roads, there may be road conditions where asphalt roads are mixed with snow and ice. Since the friction between the three road conditions and the tires is different, the vehicle is likely to fishtail due to uneven force on both sides, and the steering wheel may also have a “pulling” phenomenon during uniform driving; The new – generation SU7 can keep the vehicle running in a stable straight – line trajectory during acceleration, braking and uniform passing, effectively suppressing fishtailing and deviation.
Continuous turning & flying – slope landing: When encountering large – curvature continuous curves with snow on the road surface on expressway ramps and suburban roads, the vehicle may fishtail due to a large steering angle and low tire grip; When driving at a relatively fast speed and suddenly encountering a large – undulation ramp, such as the junction of a highway and a bridge, the vehicle is likely to be briefly airborne. When the vehicle lands again after being airborne, it may lose control or fishtail due to insufficient suspension support and untimely wheel torque adjustment; The new – generation SU7 shows a stable continuous cornering ability in ice – snow spiral curves, with a precise, stable and controllable vehicle traveling direction. And it lands safely after flying over the slope and quickly restores the vehicle’s posture to maintain stable driving.
75km/h braking: When suddenly encountering a road interruption ahead while driving on ice – snow roads, it is necessary to brake the vehicle to a stop within the shortest possible distance. However, due to the reduced tire grip on ice – snow roads, the braking distance becomes longer; and due to the sudden forward shift of the vehicle’s center of gravity during full – force braking, the rear – wheel grip is weakened, and it is easy to fishtail and lose control; The new – generation SU7 shows stable and reliable braking ability and finally achieves smooth braking.
The new – generation SU7 can successfully pass the above – mentioned wet and slippery road conditions and dangerous scenarios, thanks to the deep cooperation between the chassis software and hardware:
In terms of software: It is standard – equipped with the millisecond – level response of Bosch’s distributed traction control system dTCS. By embedding the control algorithm into the vehicle control unit (VCU), the control cycle can be shortened to 2ms, and the response speed is more than 10 times higher than that of fuel – powered vehicles, which can better suppress wheel slippage. It is standard – equipped with the Bosch ESP10.0 system. The electronic stability control system ESC included in it can intervene instantly when it senses that the vehicle has a tendency of understeer or oversteer, and correct the driving trajectory through precise braking of single or multiple wheels. The VDC2.0 body – stability control system matched with it has also been upgraded to the “feed – forward control” + “feedback control” of “predicting the trend and making precise fine – tuning in advance”, predicting the vehicle’s dynamics in advance and controlling more timely. The standard – equipped traction control system (TC/dTCS) and body – stability control system (VDC 2.0) can keenly identify the slipping trend of low – adhesion wheels and immediately limit the torque, balance the forces on both sides of the wheels, and offset the rotating torque from the root. The integration of kinetic energy recovery torque control RTCL and electro – hydraulic cooperative braking system: RTCL can intelligently judge the road adhesion limit and dynamically adjust the recovery force to avoid the instability of the driving wheels due to excessive recovery braking force; When a greater deceleration is required, the electro – hydraulic system cooperates seamlessly to achieve smooth, efficient and safe full – force braking. At the same time, the dual – motor four – wheel drive torque control eAWD of the new – generation SU7 Max can also adjust the torque distribution of the front and rear motors in real – time and dynamically, providing excellent handling stability and tracking performance for the vehicle during cornering.
In terms of hardware: The closed – type double – chamber air springs + CDC® variable – damping shock absorbers equipped on the new – generation SU7 Pro and Max versions can efficiently absorb the impact force, enabling the wheels to quickly return to the best ground – contact state. The new – generation SU7 is standard – equipped with front four – piston fixed calipers across the board, providing better braking performance.
We would like to remind everyone that this test was completed by professional drivers at a specific site. Please do not imitate it on your own.