Steering Control Apparatus Dynamic Torque Adjustment
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Solution Overview
Problem
The existing steering control systems face a reduction in collision avoidability due to increased target steering damping torque acting as a drag when the steering angle speed suddenly increases, especially when avoiding obstacles ahead of the vehicle.
Innovation Solution
A steering control apparatus that acquires a reference target torque required to avoid obstacles, determines a torque correction value based on vehicle specifications, and outputs a torque instruction to an actuator to enhance steering responsiveness and prevent delay in steering response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the target steering damping torque is increased according to an increase in steering angle speed when the steering angle speed is higher than the reference value, then the steering stability is improved, but the collision avoidability reduces when the steering angle speed suddenly increases due to steering for avoiding an obstacle
Solution Approach 1:
The control apparatus dynamically adjusts the target steering damping torque based on real-time steering angle speed and vehicle speed. When steering angle speed exceeds the reference value and vehicle speed is above a predetermined threshold, the system increases the target steering damping torque to enhance stability. However, when steering angle speed suddenly increases indicating obstacle avoidance maneuver, the system reduces the target steering damping torque to prevent drag and improve collision avoidability. This dynamic adjustment resolves the contradiction by adapting the damping torque to different operational contexts.
Solution Approach 2:
The system changes the parameter of target steering damping torque based on multiple conditions including steering angle speed and vehicle speed. By monitoring whether steering angle speed exceeds the reference value and whether vehicle speed is above a predetermined value, the system adjusts the damping torque parameter accordingly. This parameter change approach allows the system to optimize both steering stability during normal operation and collision avoidability during emergency maneuvers.
2Ease of operation
If the target steering damping torque is reduced while the driving aid apparatus is in operation compared to that while the driving aid apparatus is out of operation, then the ease of operation is improved, but the steering responsiveness deteriorates when sudden steering input is needed
Solution Approach 1:
The control apparatus implements dynamic adjustment of target steering damping torque based on driving conditions. When the vehicle is traveling at low speed (below predetermined value) and steering angle speed exceeds the reference value, the system reduces the target steering damping torque to improve steering responsiveness for obstacle avoidance. When vehicle speed is above the predetermined value, the system increases the target steering damping torque to provide easier steering operation. This dynamic behavior resolves the contradiction between steering ease and responsiveness.
Solution Approach 2:
The system adjusts the target steering damping torque parameter based on the relationship between vehicle speed and steering angle speed. By changing this parameter according to operating conditions, the system achieves both easy steering operation during normal driving and responsive steering during emergency situations, resolving the contradiction between these two requirements.
Data Source
AI summary
A steering control apparatus according to the present invention acquires a reference target torque, which is a torque regarding steering that is required to avoid an obstacle present ahead of a vehicle, determines a torque correction value for correcting the reference target torque based on specifications regarding running of the vehicle, determines a target torque based on the reference target torque and the torque correction value, and outputs a torque instruction for achieving the determined target torque to an actuator regarding the steering.