Shock Absorber Damping Control for Stable Circular Turning
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Solution Overview
Problem
Conventional vehicles with damping force adjustment type shock absorbers fail to control the regular circular turning characteristic during turning, as they constantly adjust damping force to suppress rolling, disregarding desired characteristics.
Innovation Solution
A controller that outputs command signals to actuators adjusting the shock absorber damping force, specifically in stable turning states where vehicle behavior is stabilized, to control the regular circular turning characteristic by varying wheel grip forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the damping force of the shock absorber is constantly adjusted during turning to suppress rolling, then vehicle body rolling is suppressed, but the regular circular turning characteristic cannot be controlled
Solution Approach 1:
The controller dynamically switches between two control modes based on vehicle state: rolling suppression control during transient turning and regular circular turning characteristic control during stable turning. This dynamic adaptation allows the system to optimize for different operational phases, resolving the contradiction between suppressing rolling and controlling turning characteristics.
Solution Approach 2:
The control system operates in periodic phases: initially suppressing rolling during the transient turning phase, then transitioning to controlling regular circular turning characteristics during the stable turning phase. This periodic switching enables both functions to be performed at appropriate times throughout the turning maneuver.
2Stability of the object's composition
If the damping force is adjusted to suppress rolling during turning, then vehicle body stability is improved, but the ability to control turning radius and grip forces is reduced
Solution Approach 1:
The system dynamically adjusts its control objective based on the turning phase. During transient turning, it prioritizes body stability through rolling suppression. During stable turning, it switches to prioritizing turning characteristic control by adjusting damping forces to achieve desired grip forces and turning radius, thus resolving the contradiction between stability and ease of operation.
3Stability of the object's composition
If damping force adjustment is continuously applied during turning, then rolling suppression is maintained, but the system cannot adapt to different turning characteristic requirements
Solution Approach 1:
The controller dynamically adapts its control strategy based on real-time vehicle state assessment. It determines whether the vehicle is in transient or stable turning phase and switches control objectives accordingly, enabling the system to maintain rolling suppression when needed while adapting to different turning characteristic requirements when appropriate.
Solution Approach 2:
The system changes the control parameters and objectives based on turning phase. During transient turning, it uses parameters optimized for rolling suppression. During stable turning, it transitions to parameters optimized for controlling turning characteristics, allowing adaptation to different turning requirements while maintaining stability when necessary.
Data Source
AI summary
To obtain a controller capable of controlling a regular circular turning characteristic of a vehicle during turning. A controller according to the present invention is a controller that is mounted to a vehicle including a shock absorber of a damping force adjustment type provided between a vehicle body and a wheel and outputs a command signal corresponding to a damping force of the shock absorber to an actuator that adjusts the damping force of the shock absorber. The controller is configured to output the command signal to the actuator to adjust the damping force of the shock absorber and control a regular circular turning characteristic of the vehicle when the vehicle is brought into a stable turning state where the vehicle turns in a state where a degree of a change in a physical quantity associated with a travel posture is smaller than that in a reference state.