Brake Device Load Distribution Correction for Deceleration Stability
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Solution Overview
Problem
Existing brake devices struggle to maintain stable deceleration during braking when the vehicle weight increases due to additional occupants, as they rely on pre-calculated ideal braking force distribution lines that cannot be accurately adjusted in real-time.
Innovation Solution
A brake device equipped with a load position distribution detection unit that corrects the braking force distribution to each wheel before the first braking state, using detected load position information to stabilize deceleration by adjusting hydraulic and electric braking forces independently for the front and rear wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ideal braking force distribution line is calculated in advance under light load conditions, then the braking system is simple to implement, but the deceleration becomes unstable when vehicle weight increases due to additional occupants
Solution Approach 1:
The system performs preliminary detection of load position distribution when the vehicle is stopped or in initial starting period, and corrects the ideal braking force distribution line in advance before the first braking state occurs. This preliminary correction ensures that when braking actually occurs, the braking forces are already optimized for the current load conditions, stabilizing deceleration without requiring complex real-time adjustment mechanisms during braking.
2Adaptability or versatility
If the braking force distribution is corrected during braking based on slip ratio feedback, then the braking forces can be adjusted for different vehicle weights, but the deceleration at the start of braking becomes unstable
Solution Approach 1:
The system corrects the braking force distribution in advance during the period when the vehicle is stopped or just starting, before actual braking occurs. By using the load position distribution detection unit to identify the current load conditions and pre-adjusting the ideal braking force distribution line, the system ensures that when braking begins, the correct braking forces are already set, eliminating the need for corrective adjustments during braking that would cause deceleration instability.
3Ease of operation
If the ideal braking force distribution line is determined for a specific load condition, then the braking control is simple, but it cannot reach the target deceleration when vehicle weight changes
Solution Approach 1:
The system dynamically adjusts the ideal braking force distribution line based on the detected load position distribution. Instead of using a fixed distribution line for a specific load condition, the system automatically adapts the distribution line to match the current vehicle load state, maintaining both simplicity in control logic and accuracy in achieving target deceleration across different loading conditions.
Solution Approach 2:
The system performs the adjustment of braking force distribution in advance during the stopped or initial starting period, before braking occurs. This preliminary correction ensures that when braking is applied, the braking force distribution is already optimized for the current load conditions, enabling the system to achieve accurate target deceleration without complex real-time control during braking.
Data Source
AI summary
Provided is a brake device capable of stabilizing a deceleration at the time of starting braking. The brake device is configured to correct a distribution of a braking force to each wheel or a braking force for each wheel, based on a detection value obtained by a load position distribution detection unit configured to detect a position distribution of a load applied to the vehicle when the vehicle is stopped or is in an initial period of starting.