Parking Brake Venting Flap Prevents Pressure Buildup
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Solution Overview
Problem
Existing electrically actuated parking brake systems for commercial vehicles face issues with external environmental influences, such as water, dust, and mud, causing protection components to fail, leading to unintended actuation and noise due to increased pressure and leakage in control lines, especially when parked.
Innovation Solution
The integration of a venting solenoid valve connection to the relay valve's vent, allowing for adaptive compatibility with different trailer control systems and eliminating the need for additional protective components, ensures proper venting and noise reduction by using a large opening cross-section with a silencer, preventing pressure buildup and noise exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If protection components (U-rings, rubber discs, sinter filters) are provided in the vent to prevent environmental influences from penetrating the system, then protection against water, dust and mud is improved, but these components can lose their function due to icing or dirt, causing increased dynamic pressure at the vent and potential unintended actuation
Solution Approach 1:
The patent extracts the vulnerable protection components from the venting path and replaces them with a protection flap that opens during venting operations. This removes the components that were prone to icing and dirt accumulation, eliminating the source of reliability problems while maintaining environmental protection during non-venting periods.
Solution Approach 2:
The protection flap is designed to be dynamic rather than static - it remains closed during normal operation to protect against environmental influences but opens automatically during venting operations when the solenoid valve is actuated. This dynamic behavior ensures both protection and reliable venting function.
2Productivity
If a vent is provided on the outside of the vehicle frame for venting the control chamber, then venting function is improved, but the vent is exposed to external environmental influences that can cause protection components to fail
Solution Approach 1:
The protection flap provides localized protection at the vent opening - it remains closed during normal operation to block environmental influences, but opens specifically during venting operations when needed. This local quality change allows the vent to maintain both efficiency and protection.
3Object-affected harmful factors
If additional protective components are added to the vent to prevent environmental influences, then protection is improved, but device complexity increases
Solution Approach 1:
The patent merges the protection function with the existing vent structure by integrating a protection flap into the vent assembly. This single integrated component combines environmental protection with venting functionality, eliminating the need for separate protection components and reducing overall device complexity.
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 solution ensures reliable venting and noise prevention, maintaining system functionality even when dirt or ice clog the vent, and prevents unintentional actuation of the parking brake, while ensuring the parking brake remains secure and quiet.
Implementation Method 1
the venting of the control chamber of the central control valve device, i.e. in particular the venting of the relay valve that aerates and vents the spring brake accumulator cylinder, takes place via a vent arranged on the outside of the vehicle frame
Implementation Method 2
which, comprises a knitted fabric, for example, and does not have any moving parts. Unintentional noise exposure can thus be reliably prevented
Data Source
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AI summary
The invention consists of an electrically actuable parking brake system (90) for a vehicle, in particular a utility vehicle, having a control valve device (22) which is connected to a relay control inlet (56) of a relay valve (58), wherein the relay valve (58) comprises a supply inlet (92) and a deaeration line (84) and aerates and deaerates at least one spring brake cylinder, and wherein the control valve device (22) comprises a deaeration port (70) which is connected to the deaeration line (84) of the relay valve (58). The invention also consists of a method for operating an electrically actuable parking brake system.