Multi-Circuit Hydraulic Brake Pressure Layout With Single Generator Backup
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Solution Overview
Problem
Existing hydraulic power brake systems require multiple power brake pressure generators to manage multiple brake circuits, which increases complexity and reduces reliability, especially in autonomous driving applications.
Innovation Solution
A hydraulic multi-circuit power brake system with a single first power brake pressure generator and multiple piston-cylinder units, where the first piston sides of the pistons communicate with the power brake pressure generator, and the second piston sides communicate with the brake circuits, allowing for equal or different brake pressures to be generated in each circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple power brake pressure generators are used to manage multiple brake circuits, then each circuit can have independent pressure control, but the system complexity increases and reliability decreases
Solution Approach 1:
The system divides the brake circuit control into separate piston-cylinder units, where each unit has its own piston that can be independently controlled. The control unit can selectively actuate individual pistons for different brake circuits, enabling independent pressure control without requiring multiple full power brake pressure generators. This segmentation allows each circuit to be controlled independently while using a single shared power source.
2Adaptability or versatility
If multiple power brake pressure generators are used to manage multiple brake circuits, then each circuit can have independent pressure control, but the reliability of the system reduces
Solution Approach 1:
The system merges multiple brake circuit control functions into a single power brake pressure generator that serves all circuits. Instead of having separate generators for each circuit, one generator provides power to multiple piston-cylinder units through a shared hydraulic system. This consolidation reduces the number of critical failure points while maintaining independent control capability through the control unit's ability to selectively actuate individual pistons.
3Device complexity
If a single power brake pressure generator is used for multiple brake circuits, then system complexity is reduced, but the ability to generate different brake pressures in each circuit is limited
Solution Approach 1:
The system applies local quality by giving each piston-cylinder unit its own independently controllable piston that can be actuated separately. The control unit can selectively apply power to specific pistons based on which brake circuits need activation. This allows different brake pressures to be generated in different circuits even though they all draw from the same power brake pressure generator, because each piston's actuation can be independently controlled.
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 configuration simplifies the system, reduces the risk of failure, and ensures consistent brake pressure across multiple circuits, making it suitable for autonomous driving applications up to Level 5 automation.
Implementation Method 1
a piston is displaced in a cylinder of a piston-cylinder unit by an electric motor via a worm gear, for example
Implementation Method 2
the brake circuits are connected via a respective piston-cylinder unit for each brake circuit to a first power brake pressure generator
Data Source
AI summary
An electrohydraulic multi-circuit power brake system for autonomous driving. The power brake system includes a piston-cylinder unit for each brake circuit, using which the brake circuits are connected to a common power brake pressure generator. In the event of a failure of the power brake pressure generator, the power brake system can be actuated with a hydraulic pump of a slip control system of the vehicle brake system.