Vehicle Brake Actuating System with Piston-Cylinder Units
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Solution Overview
Problem
Existing vehicle brake systems face challenges in achieving high reliability and short installed length while managing extreme pedal forces and maintaining low pressure loads, particularly in fallback scenarios where high deceleration is required without activating irritating warning lamps.
Innovation Solution
The system eliminates switching or isolating valves in hydraulic line sections between pressure sources and valve blocks, using non-return and switching valves to regulate pressure, and connects additional piston-cylinder units for enhanced volume supply, allowing for reduced complexity and length while maintaining reliability and efficient pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switching or isolating valves are used in hydraulic line sections between pressure sources and valve blocks, then pressure regulation capability is improved, but device complexity increases
Solution Approach 1:
The patent removes switching or isolating valves from the hydraulic line sections between pressure sources and valve blocks, extracting unnecessary components to reduce device complexity while maintaining pressure regulation capability through alternative means
Solution Approach 2:
The patent employs non-return valves and switching valves that serve multiple functions: non-return valves prevent backflow while switching valves regulate pressure, eliminating the need for separate switching or isolating valves and reducing overall system complexity
2Reliability
If additional piston-cylinder units are connected for enhanced volume supply, then reliability is improved, but installed length increases
Solution Approach 1:
The patent integrates additional piston-cylinder units into the existing brake system architecture, nesting them within the available spatial envelope to enhance volume supply capability without proportionally increasing installed length
Solution Approach 2:
The patent arranges piston-cylinder units in a compact three-dimensional configuration, utilizing vertical and lateral spaces efficiently to reduce the overall installed length while maintaining enhanced volume supply for improved reliability
3Productivity
If non-return and switching valves are used to regulate pressure, then pressure management efficiency is improved, but device complexity increases
Solution Approach 1:
The patent utilizes non-return and switching valves to dynamically change pressure parameters in the hydraulic system, enabling efficient pressure management by controlling fluid flow direction and pressure levels without requiring complex additional mechanisms
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 achieves reduced installed length, improved reliability, and lower constructional effort with minimized pressure loads from extreme pedal forces, ensuring effective deceleration without unnecessary warning lamp activation in fallback situations.
Implementation Method 1
Hydraulic line sections leaving the working chambers of the second pressure source or piston-cylinder unit are connected prior to the valve block VBL with the line sections coming from the working chambers of the first piston-cylinder unit. In the former in particular in each case a non-return valve and a switching valve can be arranged.
Implementation Method 2
Pressure regulation can be advantageously performed with other means, in particular existing switching valves (such as EA or VDK).
Implementation Method 3
Both solutions place high demands on the tightness of the valves. Furthermore, the additional filling of the braking circuits is associated with an interruption in the pressure build-up and minor braking losses.
Data Source
AI summary
The disclosure relates to an actuating system for a vehicle brake, with an actuating arrangement, in particular a brake pedal, at least one (first) piston-cylinder unit, which is connected via a hydraulic line to the vehicle brake (braking circuit) in order to supply the braking circuit with pressure medium and apply pressure to the vehicle brake, and with a drive for the piston-cylinder unit. Pressure medium can be fed to the braking circuit in controlled manner in both piston movement directions, in particular the advance stroke and the return stroke, by means of at least one, in particular stepped, piston of the piston-cylinder unit.