Brake Actuator Fluid Isolation for Faster Deceleration
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Solution Overview
Problem
Existing vehicle control systems face limitations in achieving instantaneous high deceleration during braking due to fluid flow rate constraints, particularly in ABS and stability control conditions, where all brake actuators receive equal pressurized fluid distribution, leading to inefficiencies and increased system costs.
Innovation Solution
The method involves isolating at least one brake actuator with a lower normal force in a braking circuit to increase the flow of pressurized brake fluid to a non-isolated actuator with a higher normal force, optimizing fluid flow and pressure distribution to enhance braking force and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pressurized brake fluid is equally distributed to all four brake actuators, then each brake actuator receives adequate fluid flow, but the rate at which vehicle speed is reduced is limited and system cost increases
Solution Approach 1:
The patent applies local quality by differentiating fluid distribution among brake actuators based on their individual normal force conditions. Instead of uniform distribution, the system selectively directs higher fluid flow rates to brake actuators experiencing higher normal forces (typically front wheels during braking), while reducing flow to actuators with lower normal forces. This localized optimization of fluid allocation increases the overall braking force rate without proportionally increasing total fluid volume requirements.
2Force
If pump flow rate is increased to meet initial volume requirements of brake actuators, then adequate braking force is achieved, but system cost increases
Solution Approach 1:
The patent implements partial action by not uniformly supplying maximum fluid flow to all brake actuators simultaneously. Instead, it prioritizes fluid supply to brake actuators that contribute most to effective braking (those with higher normal forces), providing sufficient but not excessive flow to each. This selective partial supply achieves the required total braking force while avoiding the need for an oversized pump system that would be required if all actuators received equal maximum flow.
3Reliability
If brake fluid is supplied to all brake actuators simultaneously, then comprehensive braking coverage is achieved, but the time required to build pressure is longer
Solution Approach 1:
The system performs preliminary action by pre-identifying which brake actuators will benefit most from fluid supply based on normal force conditions. During braking events, fluid is preferentially directed to brake actuators with higher normal forces first, ensuring that the most effective braking action is established rapidly. This preliminary identification and prioritized supply reduces the overall pressure build time compared to simultaneous equal distribution to all actuators.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach increases the total braking force rate by prioritizing fluid flow to wheels with higher normal forces during initial braking stages, allowing for faster deceleration and reducing system costs by optimizing fluid distribution within the braking system.
Implementation Method 1
A hydraulic actuator 21a-b, 21c-d is connected to each of the brake discs 13a-d, respectively. Each of the hydraulic actuators 21a-d utilizes a hydraulic motor to generate a braking force on the brake disc
Implementation Method 2
A brake disc 13a-d and a brake pad 12a-d are provided for each of the wheels 11a-d of a vehicle 10
Data Source
AI summary
A method is provided for efficiently decelerating a vehicle having a braking circuit for braking a set of brake actuators. A flow of pressurized brake fluid is generated within the braking circuit. Normal force parameters exerted on each wheel of the braking circuit are determined. At least one respective brake actuator is isolated from receiving pressurized brake fluid for increasing the flow of pressurized brake fluid to a non-isolated wheel of the brake circuit in response to the normal force parameters.