Brake Control Device Load Management
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Solution Overview
Problem
Conventional brake control systems apply excessive load to brake devices when transitioning from hydraulic to electric parking brake, impairing durability by maintaining a stop state with combined braking forces greater than necessary.
Innovation Solution
A brake control device that detects hydraulic and parking brake operations to generate parking braking force only when hydraulic braking force is insufficient, using a control unit to manage differential pressure and timing of electric parking brake engagement, thereby reducing the load on the brake device and ensuring reliable vehicle stop state maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric parking brake generates parking braking force while the hydraulic brake maintains hydraulic braking force, then the stop state of the vehicle can be maintained, but the load applied to the brake device increases excessively
Solution Approach 1:
The control unit determines to drive the electric parking brake motor in advance when the hydraulic braking force becomes equal to or greater than the first braking force, preparing the parking braking force before the hydraulic brake is released. This timing control ensures that the electric parking brake is already engaged when the hydraulic brake disengages, preventing excessive load while maintaining reliable stop state.
Solution Approach 2:
The system dynamically switches between hydraulic brake and electric parking brake based on real-time braking force conditions. The control unit continuously monitors hydraulic braking force and adjusts the engagement timing of the electric parking brake motor accordingly, creating a dynamic load management system that optimizes the transition between braking mechanisms.
2Reliability
If the electric parking brake is engaged earlier to maintain stop state, then reliability improves, but the hydraulic braking force must be reduced more, increasing the transition complexity
Solution Approach 1:
The control unit continuously monitors the hydraulic braking force and uses this feedback to determine the optimal timing for engaging the electric parking brake motor. When the hydraulic braking force reaches the first braking force threshold, the control unit triggers the electric parking brake engagement, creating a closed-loop control system that simplifies the transition process while ensuring reliability.
Solution Approach 2:
The system uses the first braking force parameter as a critical threshold to trigger the transition from hydraulic brake to electric parking brake. By monitoring changes in hydraulic braking force relative to this parameter, the control unit automatically initiates the electric parking brake engagement at the optimal moment, reducing control complexity through parameter-based decision making.
Data Source
AI summary
A brake control device controls a hydraulic brake that generates hydraulic braking force and an electric parking brake that generates parking braking force different from the hydraulic braking force. The brake control device comprises: a detection unit that detects a parking brake operation for causing the electric parking brake to generate the parking braking force; and a control unit that causes the electric parking brake to generate the parking braking force when the hydraulic braking force per wheel generated by the hydraulic brake, after decreasing below the minimum first braking force per wheel required for maintaining the vehicle stop state only by the electric parking brake, is less than the first braking force, in association with the parking brake operation having been performed in a state where the stop state is maintained only by a hydraulic brake operation for causing the hydraulic brake to generate the hydraulic braking force.