Automotive engineers have long been working to improve the rigidity of vehicle chassis, as a stronger chassis has historically been seen as key to improved handling, efficiency and safety. But Honda’s latest innovation challenges this century-old law: by introducing a flexible chassis concept, it gives new possibilities for vehicle dynamic performance.
Over the past 100 years, the evolution of automobile chassis can be described as a continuous pursuit of rigidity improvement. The early box-shaped frame developed into a ladder frame, and then was upgraded to a load-bearing structure with integrated body and chassis, with increasingly prominent rigidity. The traditional purpose of increasing stiffness is to combat three basic physical stresses: dead weight (including components, passengers, and cargo), torsion (twisting force from the engine), and lateral acceleration (lateral forces caused by turns and uneven road surfaces). Engineers' goal is to minimize the impact of these pressures on chassis deformation, keeping the tires as flat as possible to the ground to maintain predictable and stable steering, handling and braking.
Honda's engineers boldly imagined: If "increasing flexibility" is used instead of blindly enhancing chassis rigidity, can the above goals be achieved equally or even better? Their answer lies in the new generation chassis platform - by designing a controllable flexible area at the front of the frame, the chassis can bend and deform appropriately when turning or encountering lateral impacts on the road, thereby actively pressing the outside front wheel more firmly to the ground, and no longer relying entirely on suspension system adjustment. This design makes full use of the superior lateral strength of modern tires, achieves an engineering breakthrough in the lateral "elasticity" of the chassis within the safety limits of the tires, and effectively reduces the lateral deformation that the suspension system needs to withstand.
It is reported that this new flexible chassis platform will be the first to be used in Honda's main models in 2027, including Odyssey, Civic, Pilot, CR-V, etc., as well as a number of upcoming electric models. The platform's component commonality rate is as high as 60%, which reduces the use of high-cost materials such as aluminum, helps reduce the overall vehicle weight, and controls manufacturing costs.
The new chassis structure also brings many additional benefits. First, it can provide the driver with more direct road feel feedback through the steering wheel; second, it helps to minimize the impact of body roll on the passenger compartment, significantly improving ride comfort; third, it further improves the smoothness of the entire vehicle by flexibly absorbing the impact of uneven road surfaces. It is worth noting that Honda also claims that this chassis structure can effectively solve the common understeer (head pushing) problem of front-wheel drive models.
In terms of safety, this innovation has been integrated into Honda's new generation ACE (Advanced Compatibility Body Structure) system and has passed rigorous crash tests in Japan and the United States. According to the manufacturer, this structure will comprehensively exceed the safety indicators of cash platforms. The chassis will also incorporate Honda's latest pitch control technology (such as Agile Handling Assist and the motion management system that will be launched in Prelude and Accord) to give the vehicle a higher level of dynamic stability control.