Brake Circuit Bleeding via Integrated Pump Pressure
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Solution Overview
Problem
Modern hydraulic brake systems often require costly and time-consuming bleeding processes to remove air or gas bubbles, which can lead to increased brake pedal travel and safety risks, making it impractical for vehicle production and maintenance.
Innovation Solution
A method using a motor-driven pump to selectively increase pressure in the brake circuit for a specified period without opening bleed valves, causing residual air to dissolve in the brake fluid and remain chemically bound, thereby eliminating air from the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bleeding process is used with external pressure source and open bleed valves, then air bubbles can be removed from the brake system, but the process requires high cost, additional equipment, and increased time
Solution Approach 1:
The brake system uses its own integrated pump to generate pressure for bleeding, eliminating the need for external pressure sources and specialized bleeding equipment. The pump is already part of the brake system, so no additional devices are required.
Solution Approach 2:
The existing pump in the brake system, originally designed for other functions, is utilized for the bleeding process as well. This multi-functional use eliminates the need for dedicated bleeding equipment while achieving effective air removal.
2Reliability
If a conventional bleeding process is used with open bleed valves, then air bubbles can be purged from the system, but the process is time-consuming and impractical for vehicle production
Solution Approach 1:
The method changes the pressure parameter dynamically - first increasing pressure to dissolve air bubbles in the brake fluid, then reducing pressure to allow the dissolved air to escape. This parameter change approach enables rapid bleeding without the slow gradual process traditionally required.
Solution Approach 2:
The pump increases pressure in advance to dissolve air bubbles throughout the brake system before any bleeding occurs. This preliminary pressurization action prepares the system for rapid air removal, making the overall process much faster than conventional methods.
3Reliability
If pressure is increased in the brake circuit without opening bleed valves, then residual air dissolves in the brake fluid, but additional equipment is required
Solution Approach 1:
The brake system uses its own integrated pump to generate the necessary pressure for air dissolution, eliminating the need for external pressure sources or specialized equipment. The pump is already part of the brake system architecture.
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 method effectively reduces brake pedal travel, enhances safety, and eliminates the need for additional equipment, making the bleeding process more efficient and cost-effective during production and maintenance.
Implementation Method 1
The pump produces an increased pressure in brake system for a specified period of time
Implementation Method 2
the increased pressure causes any residual or trapped air to dissolve in the brake fluid and essentially remains dissolved or chemically bound therein when the pressure is reduced
Data Source
AI summary
A method for bleeding at least one part of a hydraulic brake system of a vehicle, wherein the brake system includes a brake circuit whose pressure can be selectively increased by a pump. The increased pressure is applied by the pump to the part of the brake system to be bled for a specified period of time without opening bleed valves.