Master Cylinder Dual Piston Fallback Mode
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Solution Overview
Problem
Conventional electronic brake systems face instability in hydraulic pressure generation during technical malfunctions, posing safety risks, and lack a reliable fallback and diagnostic mode to ensure safe operation.
Innovation Solution
A master cylinder design incorporating a pedal simulator and dual pistons with a communication channel sealing member, enabling a fallback mode for direct hydraulic pressure generation and a diagnostic mode to assess leaks, reducing system size and weight while ensuring stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electronic brake system with hydraulic pressure supply device is used to enable various braking functions, then braking functionality and control precision are improved, but system complexity and reliability during technical malfunctions deteriorate
Solution Approach 1:
The master cylinder is divided into two independent master chambers (first master chamber and second master chamber) with separate pistons. The first master chamber is pressurized by the first master piston in response to brake pedal displacement, while the second master chamber is pressurized by the second master piston in response to a master cylinder command signal. This segmentation allows the system to maintain braking functionality even when one chamber or its control system fails, thereby improving reliability during technical malfunctions.
Solution Approach 2:
The system changes the operational parameter of the master cylinder by enabling two distinct pressurization modes: pedal-driven pressurization (first master chamber) and electrically-controlled pressurization (second master chamber). This parameter change allows the system to switch between different braking control modes, maintaining versatility while improving reliability through redundancy.
2Weight of stationary object
If a pedal simulator is integrated within the master cylinder to provide reaction force, then system size and weight are reduced, but device complexity increases
Solution Approach 1:
The pedal simulator is integrated within the master cylinder assembly, merging the function of providing reaction force to the brake pedal with the hydraulic pressure generation function. This consolidation eliminates the need for a separate pedal simulator component, thereby reducing system size and weight while accepting increased internal structural complexity within the master cylinder.
Solution Approach 2:
The master cylinder is designed to perform multiple functions simultaneously: generating hydraulic pressure through two independent master chambers, providing reaction force through the integrated pedal simulator, and enabling both fallback mode and diagnostic mode. This multi-functionality reduces the need for separate components, thereby reducing system weight and size.
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 master cylinder effectively implements a fallback mode for stable braking and a diagnostic mode to assess leaks, enhancing safety and reducing system size and weight by integrating a pedal simulator within the master cylinder.
Implementation Method 1
an elastic member configured to provide elastic force in a direction in which the first piston and the second piston are spaced apart to prevent the communication channel from being blocked by the communication channel sealing member
Implementation Method 2
a first hydraulic port formed in the cylinder block to provide a pressing medium of a reservoir to the first master chamber
Data Source
AI summary
Provided is a master cylinder for an electronic brake system. The master cylinder for the electronic brake system includes a pedal simulator provided between a first master piston and a second master piston and having a rubber member that provides reaction force to a brake pedal, and the first master piston includes a first piston and a second piston coupled to be movable relative to each other and having a communication channel to allow a pressing medium to flow between a reservoir and a first master chamber, a communication channel sealing member configured to block a portion of the communication channel according to a relative movement of the first piston and the second piston, and an elastic member configured to provide elastic force in a direction in which the first piston and the second piston are spaced apart.