BYD’s Yunnian-A represents a mid-to-high-end entry in the automaker’s suspension technology lineup, positioning itself above the Yunnian-C system with enhanced capabilities.
The Yunnian-A intelligent air body control system distinguishes itself from conventional air suspension through the integration of proprietary intelligent control technology. While traditional air suspension systems offer basic height adjustment and passive road adaptation, Yunnian-A provides simultaneous height and damping adjustment with active road condition prediction.
System Architecture and Components
The system comprises air springs, electronically controlled dampers, an intelligent computing center, and dozens of sensors. This configuration represents a complete perception-decision-execution coordination system rather than a simple component upgrade. BYD developed the technology to break foreign monopolies on premium air suspension systems.
Operating Principle
The Yunnian-A system operates through three integrated stages: perception, decision-making, and execution.
Perception
The vehicle employs dozens of sensors monitoring acceleration, vehicle speed, wheel speed, and body height. The system performs thousands of scans per second to capture road conditions. Camera integration enables forward road surface scanning, detecting speed bumps, potholes, high-speed cornering, emergency braking, and upcoming road surface variations.
Decision-Making
BYD’s proprietary Yunnian intelligent computing center processes sensor data within milliseconds to determine optimal adjustment strategies for different scenarios.
During highway cruising, the system automatically lowers the body to reduce drag and improve efficiency while softening the suspension for enhanced comfort. On rough roads or inclines, the body raises automatically with maximum suspension travel reaching 150 mm, while the suspension softens to filter vibrations.
In high-speed cornering or sudden lane changes, the body lowers and suspension stiffens to suppress body roll, coordinating with seat side bolster support. During hard braking or acceleration, the suspension automatically adjusts damping to reduce pitch and enhance safety.
Execution
Air springs adjust body height while electronically controlled dampers regulate suspension stiffness. The components work in coordination according to computing center instructions, completing real-time adjustments. The air spring inflation and deflation speed enables stepless damping adjustment without perceptible transitions. The system supports multiple practical modes including welcome mode and convenient cargo access.
Driving Experience Characteristics
The Yunnian-A system delivers what BYD characterizes as premium comfort. When traversing speed bumps or rough roads, vibrations are substantially filtered, maintaining cabin stability. Rear passengers experience minimal disturbance during extended journeys.
In high-speed cornering and sudden lane changes, body roll is significantly reduced compared to conventional air suspension, maintaining stability without float sensation even at elevated speeds.
The system adapts across multiple scenarios: lowering the body at highway speeds to reduce energy consumption, raising the body on rough terrain to prevent underbody contact, providing urban comfort, and enabling occasional off-road capability exceeding Yunnian-C’s terrain clearance.
Additional features include welcome mode that automatically lowers the body for easier entry, camping leveling that automatically levels the parked vehicle, and what BYD describes as globally pioneering intelligent side bolster seats that automatically inflate to support the lower back during cornering.
Current Vehicle Applications
Yunnian-A technology is positioned for mid-to-high-end applications, primarily deployed in BYD’s premium vehicles and the Denza brand across SUV and large vehicle segments.
Denza N7
The mid-size coupe SUV represents the first vehicle to feature Yunnian-A technology. All trim levels include the intelligent air body control system as standard equipment, making it the most representative Yunnian-A application focused on premium comfort.
Denza N8
The large SUV offers Yunnian-A as an option on select higher trim levels, balancing family and business use with enhanced comfort and terrain capability.
BYD Premium Flagship Models
Subsequent new large SUVs and flagship sedans will progressively incorporate Yunnian-A technology, further expanding premium market coverage.
The Denza N7 represents the initial and most mature Yunnian-A application, making it the most direct option for experiencing the technology.
Technology Significance
BYD’s full-stack proprietary development encompasses sensors, the intelligent computing center, air springs, and electronically controlled dampers in a completely autonomous system. This approach breaks foreign monopolies while enabling more rational cost control, allowing mid-to-high-end vehicles to feature premium intelligent air suspension.
The technology’s significance extends beyond enhanced comfort and capability. It establishes Chinese brand autonomy in premium intelligent chassis systems while enabling customers to access luxury-vehicle-grade ride quality at reduced cost compared to foreign premium brands.
