Group 1 - The article discusses the complexity of automotive chassis technology, focusing on the variable gear ratio steering (VGRS) system as a specific configuration within the chassis system [1] - VGRS allows for dynamic adjustment of the steering ratio based on vehicle speed and steering angle, optimizing driving experience for both low-speed maneuverability and high-speed stability [6][13] - Traditional fixed gear ratio steering systems (CGR) can lead to challenges in handling at different speeds, necessitating the development of VGRS to address these issues [4][6] Group 2 - VGRS can be implemented through mechanical adjustments to the gear shape or through electronic means, such as steer-by-wire technology [8] - Mechanically, VGRS adjusts the density of the steering rack teeth to change the steering ratio, but it lacks the ability to adapt to vehicle speed [9] - An example of an advanced VGRS structure includes a harmonic drive reducer that allows for steering ratio adjustments based on vehicle speed and stability control [11][13]