Master Cylinder Decoupling Brake Pedal for Reliable Braking
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Solution Overview
Problem
Existing master cylinder arrangements in brake systems are prone to impaired braking performance due to driver error and potential malfunctions, such as leakage, which can lead to accidents, as they directly connect the brake pedal to hydraulic pressure, making reliable operation unreliable.
Innovation Solution
A master cylinder arrangement where the two piston arrangements are mechanically connectable only in emergency situations through a transmission element, allowing for independent activation of each hydraulic system, with a servo system for normal operation and a pedal-counterforce pressure chamber for decoupling the brake pedal from the piston arrangements, ensuring uniform braking performance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the brake pedal is directly connected to the hydraulic brake system, then the driver can directly control brake pressure, but the braking performance may be impaired due to driver error or malfunction
Solution Approach 1:
A master cylinder arrangement with two independently controllable piston arrangements (first and second) acts as an intermediary between the driver's brake pedal input and the hydraulic brake system. The control unit mediates by selectively activating piston arrangements based on braking situations, preventing direct but potentially erroneous transmission of driver input to the brake system.
Solution Approach 2:
The hydraulic brake system is segmented into two independently controllable circuits (first and second piston arrangements), each capable of independent activation. This segmentation ensures that if one circuit fails or is incorrectly activated, the other can still provide reliable braking function.
2Volume of stationary object
If the two piston arrangements are hydraulically connected, then space is saved, but reliable activation is compromised in case of leakage
Solution Approach 1:
The hydraulic brake system is divided into two independently controllable circuits with separate piston arrangements. While the piston arrangements are positioned adjacent to each other for space efficiency, each can be activated independently through separate control pathways, ensuring that a leakage in one circuit does not prevent activation of the other.
Solution Approach 2:
The system changes the operational parameter from purely hydraulic connection to a hybrid arrangement where piston arrangements can be activated either hydraulically (during normal operation) or mechanically (during emergency situations), providing flexibility and reliability.
3Reliability
If a compensation fork with direct mechanical connection is used, then emergency operation is possible, but the system complexity increases
Solution Approach 1:
The control unit serves as an intelligent intermediary that manages the complexity of coordinating between hydraulic and mechanical activation pathways. It selectively activates piston arrangements based on sensor inputs and braking situations, simplifying the overall system control while maintaining emergency operation capability.
Solution Approach 2:
The system dynamically switches between hydraulic activation mode (normal operation) and mechanical activation mode (emergency situations). This dynamic adaptability allows the system to optimize performance based on operating conditions without requiring permanently complex mechanical connections.
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 design enhances braking performance by decoupling the brake pedal from the piston arrangements during normal operation, allowing for uniform activation and ensuring reliable operation even in emergency situations, reducing the risk of accidents and improving manufacturing efficiency.
Implementation Method 1
a pressure source, which is fluidically connectable to the wheel brake units and to the master cylinder arrangement in such a way that the pressure fluid supplied from the pressure source is usable on the one hand to charge the master cylinder arrangement
Implementation Method 2
a pedal-counterforce pressure chamber for decoupling the brake pedal from the piston arrangements
Data Source
AI summary
The present invention relates to a master cylinder arrangement for a motor vehicle hydraulic brake system comprising a housing, in which two adjacent cylinder bores are provided, two piston arrangements, wherein a first piston arrangement is received in a first of the cylinder bores so as to be displaceable along a first bore longitudinal axis and wherein a second piston arrangement is received in a second of the cylinder bores so as to be displaceable along a second bore longitudinal axis, a force input piston, which is connectable or connected to a brake pedal, wherein in accordance with a movement of the force input piston the first piston arrangement and the second piston arrangement are displaceable, wherein the first piston arrangement with the housing delimits a first pressure chamber, which is fluidically connected to a hydraulic brake system, and wherein the second piston arrangement with the housing delimits a second pressure chamber, which is fluidically connected to the hydraulic brake system. In this master cylinder arrangement it is provided that between the first piston arrangement as well as the second piston arrangement and the force input piston a separate transmission element is disposed, which is movable into joint abutment with the first piston arrangement and the second piston arrangement.