On the evening of April 10, BYD officially released the Yunnian intelligent body control system.
This is another full-stack self-developed scientific and technological achievement by BYD after DM hybrid, e-platform, blade battery, CTB, Yi Sifang and other patented technologies. This technology has broken the traditional technology of Chinese brands. Barriers have filled the domestic technical gap in this area, making active body control systems no longer exclusive to overseas luxury brands. It can be said that the emergence of Yunnan has far-reaching significance for the Chinese auto market.
The Yunnan system is a full-stack intelligent body control system developed by BYD. It specifically includes the Yunnan-C intelligent damping body control system, the Yunnan-A intelligent air body control system, and the Yunnan-P Intelligent hydraulic body control system, more technical product series will be launched in the future. It is reported that the Yunnan system will be the first to be applied to models such as the U8, Denza N7, and Han EV.
The Yunnian intelligent body control system consists of the Yunnian Intelligent Exploration Architecture, the Yunnian Intelligent Computing Center, the Yunnian Intelligent Control Technology, and key components. Among them, the Yunnan Intelligent Exploration Architecture uses more than 50 sensors in the entire vehicle to sense from five dimensions: driving behavior, body, road surface, cloud data, and system. It combines steering wheel, accelerator/brake pedal, single/binocular camera, laser Components such as radar provide sensing data to achieve multi-system linkage control and enhance the driving experience.
Wang Chuanfu, BYD’s chairman and president at the press conference, said that in terms of safety, thanks to the application of cloud technology, the overall safety of vehicles will be further improved. "In the most extreme circumstances, even if one wheel falls off, the vehicle can still keep driving smoothly"! ?
The Yunnian system will integrate its previous single functions through technology
The Yunnian Intelligent Computing Center can be regarded as the "central nervous system" of the entire system. It is independently developed by BYD and has multi-core high performance. processing capabilities and supports multiple communication and signal interfaces. To put it simply, the Yunnan Intelligent Computing Center can retrieve all sensory data such as the vehicle's external camera, and use the self-developed Xingyun algorithm to calculate the vehicle attitude, wheel load, etc., and present the best control strategy in real time.
Yunnan intelligent control technology includes body control, collaborative control, interactive control and other aspects. Among them, body control technology includes height, stiffness, damping, active force control, etc., and can adapt functions according to the performance and usage scenarios of different models to meet the different needs of users.
Collaborative control technology will focus on improving the pitching comfort of the car body and enhancing lateral stability. This technology will also be integrated with body control ADAS in the future to provide high-end intelligent driving.
The interactive control technology is developed based on BYD OS and covers multiple application modes, innovative functions, multi-terminal intelligent interaction and OTA upgrades.
At this event, BYD officially released Yunnan-C intelligent damping body control system, Yunnan-A intelligent air body control system, and Yunnan-P intelligent hydraulic body control system. These three technologies It can be covered according to the characteristics of each BYD brand model.
The Yunnan-C intelligent damping body control system will be applied to the BYD Dynasty and Ocean series, the Yunnan-A intelligent air body control system will be applied to the Denza brand, and the Yunnan-P intelligent hydraulic body The control system will be used to look up to the brand.
Yunnan-C - soft and hard adjustable electromagnetic suspension, actually quite common
Yunnan-C intelligent damping body control system adjusts the shock absorbers through electronically controlled valves Damping, which can realize stepless adaptive adjustment of damping. The system can receive thousands of signals per second, and can quickly adjust the damping of the shock absorber through the Yunnan intelligent computing center.
When the vehicle passes through bumpy roads, it adopts the comfort control frequency of high frequency and small damping. When the vehicle speed is 60 kilometers per hour, Yunnan-C can achieve a vibration isolation rate of 96.
When the vehicle is cornering, accelerating, or braking quickly, a low-frequency, large-damping control frequency is used to increase the suspension support, which can suppress roll and pitch and improve the comfort inside the vehicle. .
Similarly, under the double-shifting condition of 100km/h (the elk test we often call), Yunnan-C can help reduce the vehicle's roll angle speed by 39.7.
The working principle of Yunnian-C is very similar to the current models using CDC suspension in the automobile market, but you must know that Yunnian-C is fully self-developed by BYD. It won't be long before this technology will appear on the BYD Han EV, and will gradually appear in BYD Tang, Denza and other models.
Yunnian-A - single/multi-cavity air suspension road sensing
Yunnian-A intelligent air body control system can control the air spring intake and exhaust through the Yunnan intelligent computing center , stiffness conversion valve, shock absorber solenoid valve, etc., to achieve dynamic adjustment of body control, and can adapt to different suspension adjustment strokes and stiffness schemes according to different vehicle types. The suspension adjustment stroke can reach 150 mm, and more than 10 types are provided Function mode, and can realize active adjustment of suspension height.
When the vehicle is accelerating or braking, Yunnan-A can automatically trigger multi-level stiffness adjustment, increasing the vehicle's pitch resistance by more than 25%; when the vehicle turns at high speed, the roll angle speed can be reduced by 23%. In addition, vehicles equipped with Yunnan-A will detect the status of the body thousands of times every second. When encountering continuous speed bumps and potholes, the suspension will automatically soften to maintain the stability of the body.
It is worth noting that another major feature of this system is the intelligent wing seats. The seats and air suspension are designed to share the air circuit. The air volume is intelligently distributed according to the vehicle speed, and the response speed is very fast. soon. When the vehicle is cornering at high speed, the body posture changes, and the vehicle turns, the system will automatically sense and control the inflation of the side wings of the seat to achieve adaptive adjustment of the lumbar support, allowing the body to always maintain a good driving posture. ?
In recent years, many Chinese brand new cars have used air suspension. BYD has even played tricks to bring Yunnan-A to consumers. It is different from what we usually see. A complete set of active air suspension can realize intelligent vehicle height adjustment functions during driving, including ultra-high lift, speed adjustment (automatically lowering the body when driving at high speeds), intelligent welcome, and cargo mode (taking and placing items in the trunk) Automatically lowering the car body when the vehicle is running) and other functions, it has better performance in terms of passability, energy consumption performance, ease of use, etc.
It is understood that Yunnan-A will be the first to appear on the Denza N7 model. Judging from the current news, Denza N7 uses a single-cavity air suspension, and the Yunnan-A series will also have dual-cavity and multi-cavity air suspensions in the future.
Yunnan-P - an off-road weapon with four suspensions that can be adjusted individually
The Yunnan-P intelligent hydraulic body control system is more complicated than what was just introduced. In addition to the intelligent In addition to the calculation center and front and rear shock absorbers, many control modules have been added, such as continuous damping control module, multi-level stiffness control module, attitude control module, four-wheel linkage module, suspension motor pump module, suspension control accumulator, Multi-stage buffer accumulator, etc., is a body control system that integrates three core technologies: mechanical, hydraulic and electronic control.
With the support of these functions, the performance is more powerful, and the vehicle can easily cope with more complex off-road environments. The suspension adjustment stroke can reach 200mm, which can not only realize the simultaneous lifting and lowering of four wheels, but also realize the independent lifting and lowering of one wheel.
Under extreme conditions, such as when the vehicle encounters an emergency such as falling down a slope during high-intensity off-roading, the three-level stiffness can be triggered in an emergency, effectively reducing the impact load by 50%, making the passengers in the vehicle more secure and comfortable.
It is worth noting that Yunnan-P can also realize two unique functions, namely four-wheel linkage and camping leveling.
Four-wheel linkage is when the vehicle is driving on difficult cross-axle road conditions. The four-wheel linkage function can deliver oil to the suspended wheel shock absorber, lengthen the suspension stroke, and improve the wheel's ground contact and overall stability. The car's sense of balance ensures effective output of four-wheel power.
This function can make the vehicle's maximum wheel difference reach 620mm, and the vehicle's slope driving index RTI value reaches more than 600. For off-road vehicles using hard-axle non-independent suspension, the RTI index is 600 It's not too big, but for the four-wheel independent suspension model equipped with Yunnan-P, such data is quite impressive.
The camping leveling function can adjust the height of the single wheel in a stationary state to keep the plane of the car body and the direction of gravity always vertical, thereby achieving a level inside the car, which means that it does not need to be used when camping in the wild. Struggling to find flat ground, just turn on the camping leveling button to keep your car level!
The Yunnan-P intelligent hydraulic body control system will be installed on models under the U8 and F brands. With the opening of the Shanghai Auto Show, I believe consumers will soon feel the unique advantages of the U8. charm!
Look up to the U9 who knows how to "dance"
At the end of the press conference, BYD also brought you a little easter egg-Yunnian-X. As the flagship model of the Yunnan system, the system will be installed on the supercar model U9.
Yunnan-X combines the technical essence of the three systems of C/A/P. It can use binocular cameras or lidar to identify the undulations of the road ahead, and proactively adjust the status of the suspension system in a predictive manner. It also seems to realize the "road-seeing" function, which can control vehicle body dynamics more proactively and intelligently.
A U9 equipped with Yunnan-X made a "gorgeous" appearance following the rhythm of the music. At the climax of the music, there was a vertical bounce with four wheels off the ground. Although what exactly was it? The principle is not officially explained, but such exaggerated "showy operation" does demonstrate Yunnan-X's powerful chassis tuning capabilities and four-wheel suspension control capabilities!
It is worth noting that the Yunnan system is not the first independently developed core technology launched by BYD. From relevant information, we can see that in the 20 years since it entered the new energy vehicle track, BYD has invested hundreds of billions of R&D funds, has a team of 69,000 people, and 28,000 authorized patents. The Yunnan system released this time is another self-developed technological achievement by BYD following key technologies such as DM hybrid, e-platform, blade battery, CTB, and Yi Sifang!
It has been 27 years since the BYD brand was established in 1995 and has now become one of the world's top 500 companies. BYD can be said to be one of the earliest car companies in China to enter the field of new energy vehicles. Over the years, It has achieved good results in the battery field, motor field and electronic control field of new energy vehicles and even in the field of automotive grade chips.
In 2020, BYD launched the blade battery. Compared with traditional lithium iron phosphate batteries, blade batteries have the advantages of long life and high endurance. At the same time, the blade battery has also passed the "needle penetration test", which also means extremely high safety performance.
CTB battery body integration technology is based on the design concept of "battery body integration", integrating the blade battery with the body to achieve a ring-shaped body structure, which not only balances the center of gravity of the vehicle, but also makes the entire vehicle more comfortable. The strength of the car has been greatly improved, and CTB technology has also been combined with the cuboid structure of the blade battery to derive a "honeycomb aluminum-like" structure, bringing major innovations in battery pack technology.
The "Easy Sifang" released not long ago is the first mass-produced four-motor drive technology in China. With the four-motor independent vector control technology, it can better control the body posture and provide users with better Safety and security. Unlike "Wei Xiaoli" who likes to promote PPTs, BYD has always been very low-key in the layout of major technologies. Even on the eve of the launch of the Yunnian intelligent body control system, many people had no idea what Yunnian was.
It is undeniable that BYD has reached unprecedented heights through years of technological research and development in the three major technical fields of battery, electric drive, and electronic control. In addition to its excellent sales performance, it has also attracted the attention of Toyota, Daimler, etc. International established car companies cooperate with it in the field of new energy.
At the BYD performance conference not long ago, Wang Chuanfu made an admirable statement: "
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