Brake Force Distribution Control for Quiet Tight Vehicle Turns
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Solution Overview
Problem
Existing vehicle control devices generate unpleasant creeping noise during tight-turn facilitation, which affects passenger comfort and is not effectively minimized.
Innovation Solution
A vehicle control device that includes an information acquirer, a distribution amount setter, and a brake controller, which sets a distribution amount of brake force to zero when the steering angle is within a neutral state, and adjusts brake force distribution based on vehicle speed and steering angle to minimize noise during tight-turn facilitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If brake force is applied to a specific wheel at the timing when the wheel starts to move to facilitate a tight turn, then tight-turn performance is improved, but creeping noise is generated
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the brake force distribution amount based on steering angle magnitude. When the steering angle exceeds a predetermined threshold, brake force is applied to the specific wheel to facilitate tight turning. When the steering angle is within the threshold range, the brake force distribution amount is set to zero to prevent creeping noise. This conditional parameter adjustment resolves the contradiction between tight-turn performance and noise prevention.
2Object-affected harmful factors
If brake force distribution is adjusted based on steering angle to minimize creeping noise, then passenger comfort is improved, but tight-turn facilitation capability may be reduced
Solution Approach 1:
The patent employs dynamics by making the brake force distribution amount variable rather than fixed. The distribution amount is dynamically changed based on the steering angle: it is set to zero when the steering angle is small (within threshold) to ensure comfort, and is set to a non-zero value when the steering angle exceeds the threshold to enable tight-turn facilitation. This dynamic adjustment strategy resolves the contradiction between comfort and capability.
Data Source
AI summary
A vehicle control device includes an information acquirer that acquires information on driving conditions of a vehicle at least containing a steering angle and a vehicle speed, a distribution amount setter that sets a distribution amount of a brake force to each of multiple wheels provided in the vehicle based on the driving conditions of the vehicle; and a brake controller that performs brake control of each of the multiple wheels according to the distribution amount set by the distribution amount setter. The distribution amount setter sets the distribution amount to zero when the steering angle SA is less than a first steering angle threshold where the steering angle SA is recognizable as a substantially neutral state.