Deflection Control Releaser Dynamics for Driver Comfort
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Solution Overview
Problem
The existing deflection control systems cause discomfort to drivers when releasing deflection control during steering operations, as they do not account for the controlled variables associated with the deflection control, leading to unintended yaw rates and vehicle deflections.
Innovation Solution
A deflection control apparatus that detects steering operations and reduces the controlled variables associated with deflection control over a shorter time than the fall time when deflection control is normally ended, using a gradually decreasing slope to minimize driver discomfort and vehicle deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the deflection control is released when the driver performs a steering operation, then the driver's will is prioritized, but the driver experiences discomfort due to unintended yaw rate changes
Solution Approach 1:
The system performs preliminary action by gradually reducing the controlled variable before completely releasing the deflection control. This gradual reduction prepares the system for the transition, allowing the driver's steering input to take effect more smoothly and reducing the sudden yaw rate changes that cause discomfort.
Solution Approach 2:
The system applies dynamics by adjusting the release behavior based on the current controlled variable. When the controlled variable is large, the release is more gradual; when it is small, the release can be faster. This dynamic adjustment optimizes the transition process to minimize driver discomfort while still prioritizing the driver's will.
2Speed
If the deflection control is released immediately when steering operation is detected, then the response is fast, but the controlled variable causes unintended vehicle deflection
Solution Approach 1:
The system performs preliminary reduction of the controlled variable before the complete release. This preliminary action ensures that the braking force difference is already reduced when the steering operation takes full effect, preventing unintended vehicle deflection while maintaining a relatively fast overall response.
Solution Approach 2:
The system applies partial action by reducing the controlled variable to a lower value rather than immediately setting it to zero. This partial reduction is sufficient to prevent harmful unintended deflection while allowing the steering operation to proceed without excessive interference.
3Stability of the object's composition
If the controlled variable is reduced over a long fall time when deflection control is ended, then the transition is smooth, but the response to steering operation is delayed
Solution Approach 1:
The system dynamically adjusts the reduction time based on the current controlled variable. When the controlled variable is large, a longer reduction time is used for smoothness; when it is already small, a shorter reduction time is used to respond quickly to the steering operation. This dynamic timing resolves the contradiction between smoothness and responsiveness.
Solution Approach 2:
The system changes the parameter of reduction time based on the controlled variable's magnitude. By adapting the time parameter to the current state, the system achieves both smooth transitions when necessary and fast responses when the controlled variable is already small, eliminating the fixed trade-off between smoothness and speed.
Data Source
AI summary
A deflection control apparatus is configured to perform a deflection control in which a subject vehicle is deflected by a braking force difference between left and right wheels. The deflection control apparatus is provided with a releaser configured to release the deflection control if a steering operation, which is an operation of deflecting the subject vehicle in a direction opposite to a direction in which the subject vehicle is deflected by the deflection control, is detected during the deflection control. When releasing the deflection control, the releaser is configured to reduce a controlled variable over a predetermined time, which is shorter than a fall time of the controlled variable when the deflection control is ended without being released, and which becomes longer, as the controlled variable increases when the steering operation is detected.