MIIT Proposes New Rules to Regulate Zero-Gravity Seat Safety Standards

The Ministry of Industry and Information Technology (MIIT) recently released a draft for public comment on the national standard GB 15083-202X, titled "Requirements and Test Methods for Strength of Motor Vehicle Seats, Seat Anchorages, and Head Restraints." For the first time, this draft explicitly addresses large-recline-angle seats, occupant protection functions, and electric seat safety. As zero-gravity seats become increasingly common in new vehicles—with reclined seating positions now appearing in the driver’s seat, front passenger seat, and rear rows—the traditional safety framework based on standard upright postures is facing significant challenges. The concept of zero-gravity seating originates from aerospace engineering, aiming to distribute body pressure more evenly by adjusting the backrest, seat cushion, leg rest, and joint angles. Automakers currently implement this concept in varied ways: some merely add electric leg rests, while others integrate coordinated adjustments across multiple support points. With the adoption of full-by-wire chassis and steer-by-wire technologies, achieving a zero-gravity posture even in the driver’s seat is gradually becoming feasible. However, collisions occurring while occupants are in a semi-reclined position may lead to risks such as misalignment of seat belt load paths, occupant submarining (sliding under the belt), and reduced effectiveness of airbag coverage zones. The new draft stipulates that the driver seat’s torso angle must not exceed 35°. Conventional seats lacking corresponding occupant protection features are similarly restricted. Additionally, if a vehicle is traveling at high speed while the seat is in a large-recline position, the system must issue a risk warning. The draft also introduces new anti-pinch requirements for electric seats to mitigate injury risks associated with leg rests and complex mechanical structures. Some automakers have already begun exploring solutions ahead of the regulation. NIO integrates its seats with perception systems to automatically return the seatback by approximately 20° within 0.7 seconds before an imminent collision. XPeng employs an integrated ABTS+PLP dual pre-tensioning and load-limiting seat belt in the second row, complemented by anti-submarining airbags in the seat cushion, large-volume side curtain airbags, and energy-absorbing collapsible seat structures. Harmony Intelligent Mobility Alliance (HIMA) has implemented wrap-around, fully enveloping airbags in its MPV models. This draft marks a pivotal shift in automotive safety standards—extending beyond traditional driving scenarios toward diverse usage conditions—and signals that zero-gravity seats are evolving from mere comfort features into integral components of the vehicle’s overall safety architecture.