Master Cylinder with Pressurized Fluid Injection for Brake Pedal Decoupling
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Solution Overview
Problem
Existing braking systems face challenges in providing a robust, simple, and pleasant pedal feel while ensuring effective braking, especially in the event of booster failure, and they often require complex and fragile components to decouple brake pedal position from hydraulic pressure.
Innovation Solution
A braking system featuring a master cylinder with a variable-volume chamber and a source of pressurized brake fluid, where the connection to the chamber allows direct injection of brake fluid, enabling decoupling between the brake pedal and hydraulic pressure, and includes hydraulic brake boosting means for enhanced braking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pedal feel simulator is used to decouple brake pedal position from hydraulic pressure, then decoupling is achieved, but device complexity and fragility increase
Solution Approach 1:
The invention extracts the decoupling function from complex simulator mechanisms and implements it directly through the master cylinder's variable-volume chamber design. The chamber volume variation, controlled by piston movement, inherently decouples pedal position from hydraulic pressure without requiring separate simulator components, thus achieving the desired adaptability while reducing device complexity.
Solution Approach 2:
The master cylinder is designed to perform multiple functions: it generates hydraulic pressure, decouples pedal position from pressure, and provides braking force amplification. By integrating these functions into a single component rather than requiring separate simulator devices, the system achieves decoupling capability while minimizing complexity and fragility.
2Force
If hydraulic brake boosting means are added to enhance braking performance, then braking performance improves, but device complexity increases
Solution Approach 1:
The invention merges the brake boosting function with the master cylinder by integrating a boosting chamber that receives force from the brake booster and transmits it to the braking system. This combination allows the master cylinder to perform both pressure generation and force amplification in a single integrated component, improving braking force while avoiding the complexity of separate boosting mechanisms.
Solution Approach 2:
The invention uses hydraulic principles to transmit and amplify braking force. The master cylinder utilizes hydraulic pressure from the brake booster to generate amplified braking force in the output chambers, providing enhanced braking performance through fluid pressure transmission rather than complex mechanical linkages.
3Ease of operation
If the master cylinder chamber volume is made variable to improve pedal feel, then pedal feel is refined, but manufacturing complexity increases
Solution Approach 1:
The invention implements a variable-volume chamber where the chamber volume changes dynamically with piston position during brake application. This dynamic volume variation provides refined pedal feel by adjusting hydraulic compliance during braking, while the variable geometry is achieved through standard piston and chamber design rather than complex adjustable mechanisms, maintaining manufacturing simplicity.
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
The system provides a robust, simple, and comfortable braking experience with refined pedal feel, ensuring effective braking even in the absence of the booster, by injecting brake fluid into the master cylinder's chambers, which maintains pressure and reduces pedal travel, enhancing driver comfort and safety.
Implementation Method 1
means of connection to a source of pressurized brake fluid
Implementation Method 2
means of injecting brake fluid into said chamber
Implementation Method 3
at least one variable-volume chamber and one moving piston, the movement of which causes the volume of said chamber to vary
Implementation Method 4
hydraulic brake boosting means for enhanced braking performance
Data Source
AI summary
The present invention relates mainly to a braking system comprising a master cylinder comprising means of connection to a hydraulic braking circuit and means of connecting at least one chamber of the master cylinder to means of injecting brake fluid into said chamber. The main subject of the invention is a master cylinder (48) comprising at least one variable-volume chamber and one moving piston (207), the movement of which causes the volume of said chamber to vary, and means of connecting said chamber to a hydraulic braking circuit, characterized in that it further comprises means (217) of connection to a source (116) of pressurized brake fluid. The invention applies notably to the motor industry. The invention applies mainly to the braking industry.