Electropneumatic Parking Brake Module Pneumatic Bypass Unit
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Solution Overview
Problem
Existing electropneumatic parking brake modules require continuous energization to maintain the state of spring-loaded brake cylinders, and they often rely on complex components like relay valves and bistable valves, which are undesirable due to energy consumption and complexity.
Innovation Solution
An electropneumatic parking brake module that uses a pneumatically controlled bypass unit to maintain the ventilation or venting state of spring-loaded brake cylinders without energization, eliminating the need for bistable and relay valves by directly connecting the supply to the brake pressure and utilizing a bypass unit to lock in the state, ensuring the system operates without electrical energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay valves and bistable valves are used to maintain the state of spring-loaded brake cylinders, then the brake state can be maintained during driving and parking, but the system complexity and energy consumption increase due to continuous energization requirements
Solution Approach 1:
The patent removes the bistable valve from the system and replaces it with a simplified valve unit that has integrated pneumatic spring accumulation and release functions. This extraction of the complex bistable valve component directly reduces device complexity while maintaining the essential brake state maintenance function through a more straightforward valve mechanism.
Solution Approach 2:
The patent combines the functions of the relay valve and bistable valve into a single integrated valve unit. This merging of previously separate components into one unified valve assembly reduces the overall number of parts, simplifies the system architecture, and eliminates the need for continuous energization while maintaining reliable brake state control.
2Use of energy by stationary object
If bistable valves are used to maintain aerated or vented state of spring brake cylinders, then the brake state is maintained without permanent energization, but the valve complexity and size increase
Solution Approach 1:
The patent extracts and eliminates the bistable valve component entirely, replacing its function with a simpler valve unit that achieves the same energy-saving effect through a different, less complex mechanical-pneumatic mechanism. This removal directly addresses the device complexity issue while preserving the energy efficiency benefit.
Solution Approach 2:
The valve unit is designed to automatically maintain the pneumatic state of the spring brake cylinders without requiring external control signals or permanent energization. The valve self-regulates the aerated and vented states through its inherent pneumatic mechanism, eliminating the need for complex control systems while achieving the desired energy conservation.
3Productivity
If relay valves are used to supply volume flow to spring-actuated connections, then adequate brake actuation is achieved, but the system size and complexity increase
Solution Approach 1:
The patent merges the relay valve functionality into the integrated valve unit, combining the volume flow supply function with the brake state maintenance function in a single compact component. This integration maintains adequate brake actuation speed while eliminating the need for a separate, larger relay valve assembly.
Solution Approach 2:
The valve unit is designed as a multi-functional component that simultaneously performs the functions of the relay valve (supplying volume flow for brake actuation) and the bistable valve (maintaining aerated/vented states). This universal design achieves adequate brake productivity while reducing overall system complexity by eliminating the need for separate specialized valves.
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 allows for efficient maintenance of both pressurized and vented states of spring-loaded brake cylinders without electrical energy, reducing complexity and energy consumption, and provides a stable pneumatic self-locking mechanism to prevent leakage and sudden changes in brake state.
Implementation Method 1
pneumatically controlled bypass unit for maintaining a ventilation or venting state of spring-loaded brake cylinders connected to the spring-loaded connection in a de-energized state of the electropneumatic inlet-outlet valve unit
Implementation Method 2
spring-loaded brake actuator which applies the brake without pressure, so that the vehicle is braked accordingly when there is no pressure
Implementation Method 3
To release the spring-loaded brakes, compressed air is applied to them so that the spring-loaded brakes are released against the force of the spring
Data Source
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AI summary
The invention relates to an electropneumatic parking brake module (1), having a reservoir connection (2) for connecting a compressed air reservoir (3), at least one spring mechanism connection (4) for connecting at least one spring-loaded brake cylinder (6), an electropneumatic inlet-outlet valve unit (10), which can assume at least one first switch position and one second switch position, wherein, in the first switch position, the inlet-outlet valve unit (10) of the reservoir connection (2) is connected to the spring mechanism connection (4) in order to modulate a spring mechanism brake pressure (pF), and, in the second switch position, the inlet-outlet valve unit (10) of the spring mechanism connection (4) is connected to a vent (5) of the inlet-outlet valve unit (10). According to the invention, there is a pneumatically controlled bypass unit (12) for maintaining a ventilation state or venting state of spring-loaded brake cylinders (6) connected to the spring mechanism connection (4) while in a currentless state of the electropneumatic inlet-outlet valve unit (10).