Steering Control System for Two-Wheeled Vehicles
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Solution Overview
Problem
Existing steering control systems for two-wheeled vehicles, such as bicycles with front baskets, often hinder the operability of the steering handle due to restrictive torque control, especially when the driver attempts to make quick or large rotations.
Innovation Solution
A steering control system that includes an electric motor actuator, a sensor for detecting vehicle turning values, and a control device that calculates resistive torque and assistive torque to improve the operability of the steering handle. The system applies appropriate torque to the steering shaft based on the resistive and assistive torque calculations, allowing for smoother and more intuitive steering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an electric motor actuator is controlled to restrict the angular velocity and angle position of the steering shaft within predetermined ranges, then the steering stability is improved, but the operability of the steering handle is hindered when the driver intends to operate quickly or rotate greatly
Solution Approach 1:
The control device dynamically adjusts the torque applied by the electric motor actuator based on real-time detection of steering angle and angular velocity. Instead of using fixed restrictive ranges, the system continuously adapts the torque magnitude and direction to match the driver's instantaneous steering intentions, thereby maintaining stability while preserving operability during quick or large steering operations.
Solution Approach 2:
The system employs feedback control by detecting the steering angle and angular velocity, comparing them against target values, and adjusting the actuator torque accordingly. The control device calculates the difference between actual and target angular velocity/position, then applies corrective torque to guide the steering shaft back to the desired trajectory, ensuring both stability and responsiveness to driver input.
2Stability of the object's composition
If an electronic control steering damper is used to apply damping force to the steering shaft rotation, then the steering stability is improved, but resistance acts on the steering handle movement even when restriction is not needed, hindering operability
Solution Approach 1:
The electric motor actuator dynamically adjusts its torque output based on detected steering conditions. When quick or large steering operations are detected, the actuator reduces or eliminates restrictive torque to maintain operability. When stability is needed, the actuator applies appropriate damping torque. This dynamic adjustment eliminates the constant resistance problem of traditional dampers.
Solution Approach 2:
The system changes the torque parameter applied by the actuator based on steering conditions. By monitoring steering angle and angular velocity, the control device adjusts the torque magnitude and sign (direction) in real-time, transitioning between assistive and restrictive modes as needed. This parameter adaptation allows the system to provide stability only when necessary, preserving natural steering feel during normal operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enhances the operability of the steering handle by providing appropriate torque assistance, allowing drivers to make quick and large rotations without hindrance, while also preventing unintended steering movements due to minute changes in vehicle turning values.
Implementation Method 1
an actuator that includes an electric motor and applies torque to a steering shaft
Data Source
AI summary
A control device calculates resistive torque, which is directed in a direction opposite to a direction in which a steering shaft is rotated from a neutral position and corresponds to a vehicle turning value, which is a rotation angle of the steering shaft or a roll angle of a vehicle body, and controls an actuator that applies torque to the steering shaft based on the resistive torque. This improves operability of a steering handle.