Brake Control Device for Four-Wheel-Drive Vehicles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing brake control technologies fail to optimally distribute hydraulic braking force and parking brake force on vehicle wheels, leading to insufficient brake force for maintaining a stationary state or excessive hardware load due to inappropriate timing settings.
Innovation Solution
A brake control device that includes a detection unit and a control unit to adjust hydraulic braking force on front and rear wheels, allowing the electric parking brake to generate a parking brake force only when necessary, thereby reducing overlapped generation of braking forces and maintaining a stationary state with reduced load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the hydraulic braking force is reduced during electric parking brake operation, then the load due to overlapped generation of braking forces is decreased, but the stationary state may not be maintained due to insufficient brake force
Solution Approach 1:
The braking force is segmented between hydraulic brake and electric parking brake based on wheel-specific conditions. The control unit determines whether each wheel (front or rear) should receive hydraulic braking force or parking brake force, dividing the braking function across different systems and wheels to optimize load distribution while ensuring sufficient total braking force for maintaining stationary state
Solution Approach 2:
The system dynamically adjusts the distribution of hydraulic braking force and parking brake force based on real-time detection of brake operations and current braking conditions. The control unit continuously monitors and repositions the braking force allocation between front and rear wheels, transitioning between hydraulic and electric braking systems as needed to maintain optimal performance
2Productivity
If the timing of hydraulic braking force reduction and parking brake force generation are not appropriately set, then the brake force distribution is not optimal, but the control complexity increases
Solution Approach 1:
The control unit performs preliminary assessment of braking conditions before initiating hydraulic braking force reduction or parking brake force generation. By detecting brake operations in advance and pre-calculating the optimal timing for force transition, the system avoids suboptimal brake force distribution without requiring complex real-time coordination during the actual braking event
Solution Approach 2:
The system uses feedback from the detection unit that monitors brake operations and stationary state maintenance to continuously adjust the timing of hydraulic braking force reduction and parking brake force generation. This closed-loop control ensures optimal brake force distribution while simplifying timing coordination through adaptive adjustment based on actual system response
Data Source
AI summary
The brake control device controls a hydraulic brake to generate hydraulic braking force on both the front and rear wheels of a four-wheel-drive vehicle, and an electrical parking brake to generate parking brake force, different from the hydraulic braking force, on the front or rear wheels. The brake control device includes: a detection unit that detects parking brake operation for causing the electrical parking brake to generate a parking brake force; and a control unit for reducing the hydraulic braking force generated on the front wheels or the rear wheels and adjusting the hydraulic braking force on the other of the front wheels or the rear wheels to a magnitude allowing a stationary vehicle state to be maintained, before a parking brake force is generated by the electrical parking brake, when a parking brake operation is detected while a stationary state is being maintained solely by the hydraulic braking force.