Two-Wheeler Steering Assist Torque Control for Low-Speed Stability

The patent replaces the rider's mechanical steering effort with an electric motor-driven steering assistance system. The electric motor generates torque to assist the rider in steering the vehicle, particularly at low speeds where the vehicle is inherently unstable. This substitution of mechanical effort with electric actuation reduces the force the rider must exert on the handle bar while maintaining vehicle stability.

The patent introduces an intermediary steering assistance mechanism between the rider's steering input and the vehicle's front wheel. This intermediary system includes an electric motor, gear box assembly, and control unit that processes steering torque and provides assisted steering input. The intermediary system amplifies the rider's steering effort and adds electric torque to stabilize the vehicle during low-speed operation.

The patent changes the operational parameters of the electric motor based on detected vehicle conditions. The control unit adjusts the motor's torque output dynamically according to the vehicle's speed, steering angle, and stability state. At low speeds where stability is critical, the motor provides higher torque assistance. At higher speeds, the assistance is reduced or deactivated. This parameter adaptation allows the use of a smaller, lighter motor that only provides assistance when needed, rather than requiring a heavy motor capable of continuous high-torque operation.

The patent implements a dynamic steering assistance system where the electric motor's torque contribution is continuously adjusted based on real-time vehicle state detection. The system transitions between different operational modes: high-assistance mode at low speeds for stability, reduced-assistance mode during transient maneuvers, and minimal-assistance mode at high speeds. This dynamic adaptation optimizes the motor size and weight while maintaining effective steering stability throughout the operating range.

The patent employs parameter-based torque control to optimize motor selection and operation. By detecting vehicle speed, steering angle, and stability conditions, the control unit adjusts the motor's torque output to match the actual stabilization needs. This prevents over-engineering the motor for peak requirements that rarely occur, allowing the use of a smaller, more cost-effective motor that operates efficiently within a reduced torque range, thereby lowering manufacturing costs.

The dynamic control strategy enables the use of a lighter, less expensive electric motor by activating assistance only when and where needed. The system's ability to provide high torque temporarily during critical low-speed stabilization events, rather than requiring continuous high-torque capability, significantly reduces the motor's rated power requirements and associated manufacturing costs.