Vehicle Braking Control Device for Stability and Deceleration Trade-off
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Solution Overview
Problem
Existing vehicle braking control systems face a trade-off between directional stability and deceleration ability, particularly during sharp turns, where improving one aspect often compromises the other.
Innovation Solution
A braking control device that adjusts the braking torque of individual wheels using an actuator and controller, which detects steering angle and yaw rate to calculate a reference and actual turning amount, and an understeer index, allowing for dynamic adjustment of the increase slope of braking torque based on predefined threshold regions to balance stability and deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the pressure increase slope of the pressure increase control is decreased, then the directional stability is improved, but the deceleration ability of the vehicle is reduced
Solution Approach 1:
The patent applies dynamics by making the pressure increase slope adjustable rather than fixed. The control device dynamically changes the pressure increase slope based on vehicle operating conditions (straight running vs. turning), allowing optimization of both directional stability during straight running and deceleration ability during turning by adapting the control parameter to the current situation
Solution Approach 2:
The patent implements parameter changes by modifying the pressure increase slope parameter according to vehicle state. When the vehicle is detected to be turning, the pressure increase slope is reduced to improve directional stability; when the vehicle is running straight, the pressure increase slope is increased to enhance deceleration ability, thus resolving the contradiction through conditional parameter adjustment
2Speed
If the pressure increase slope is increased, then the deceleration ability of the vehicle is increased, but the directional stability is deteriorated
Solution Approach 1:
The control system dynamically adjusts the pressure increase slope based on real-time detection of vehicle turning state. During turning operations, the system reduces the pressure increase slope to maintain directional stability, while during straight running, it increases the slope to maximize deceleration ability, thereby resolving the contradiction through dynamic adaptation
Solution Approach 2:
The patent changes the pressure increase slope parameter conditionally based on vehicle operating state. By detecting whether the vehicle is turning or running straight, the system appropriately adjusts the pressure increase slope to achieve optimal balance between deceleration ability and directional stability for each specific condition
Data Source
AI summary
A braking control device includes an actuator, a controller, a steering angle sensor, and a yaw rate sensor. The controller calculates a reference turning amount, an actual turning amount, an understeer index, sets to a non-adjustment region in which the increase slope is not decreased when the understeer index is smaller than or equal to a first threshold value, sets to an adjustment region in which the increase slope is decreased when the understeer index is greater than or equal to a second threshold value greater than the first threshold value, and sets to a transition region in which the increase slope is decreased when the understeer index is transitioned from the non-adjustment region and the increase slope is not decreased when the understeer index is transitioned from the adjustment region when the understeer index is greater than the first threshold value and smaller than the second threshold value.