Electropneumatic Brake Module With Separate Pneumatic Circuits
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Solution Overview
Problem
Existing electropneumatic pressure regulating modules in vehicle brake systems face reliability issues due to shared compressed air stores and circuits, leading to potential failures in both pressure channels when one store fails or leaks, and require additional air stores for increased reliability.
Innovation Solution
Designing pressure regulating channels with separate pneumatic circuits and dedicated compressed air stores, ensuring each channel has a distinct supply from its own air store, and incorporating separate backup circuits for increased reliability, allowing the system to maintain functionality even if one channel fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single compressed air store is used to supply multiple pressure regulating channels, then the device complexity is reduced, but the reliability deteriorates because failure of one store affects all channels
Solution Approach 1:
The brake system is segmented into multiple independent pneumatic circuits, each with its own compressed air store and pressure regulating channel. This segmentation ensures that a failure in one circuit does not affect the others, thereby improving reliability while maintaining manageable complexity through modular design
2Reliability
If additional compressed air stores are added to increase reliability, then the reliability improves, but the device complexity and cost increase
Solution Approach 1:
The system divides the brake circuit into separate pneumatic segments, each with dedicated air stores. This segmentation provides failure resistance without requiring excessive redundancy, as each segment operates independently with its own air supply
Solution Approach 2:
The system incorporates dynamic switching capabilities that allow air stores to be selectively activated or deactivated based on operational needs and failure conditions, optimizing the use of available air stores rather than requiring all to be permanently active
3Reliability
If pneumatic circuits are shared between pressure regulating channels, then the device complexity is reduced, but the reliability deteriorates due to potential cracks and failures in shared lines
Solution Approach 1:
The pneumatic circuit is segmented into separate, non-shared pathways for each pressure regulating channel. This eliminates the risk of a single crack or failure affecting multiple channels, as each channel has its own dedicated air line from its respective air store
Solution Approach 2:
The shared pneumatic circuit element is extracted and removed from the system. Each channel is given its own dedicated air line, eliminating the vulnerable shared portion that could propagate failures across multiple channels
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 design enhances the reliability of the electropneumatic brake system by ensuring that a failure in one pressure regulating channel does not affect the entire module, allowing continued braking functionality on other axles and eliminating the need for additional compressed air stores, thus providing a cost-effective and fail-safe solution.
Implementation Method 1
a dedicated storage pressure port (14, 24) which can be connected to a dedicated compressed air store (4, 6)
Implementation Method 2
a regulated working pressure, acting at at least one working pressure port (44, 46), for at least one brake application device (48, 50) is generated for each pressure regulating channel
Data Source
AI summary
An electropneumatic pressure regulating module, formed as a structural unit, is described for an electropneumatic brake system of a vehicle, including: at least two separately regulable pressure regulating channels, wherein a regulated working pressure, acting at at least one working pressure port, for at least one brake application device of the brake system is generated for each pressure regulating channel on the basis of working air originating from at least one compressed air store and as a function of braking demand signals of a brake transducer, in which to form pressure regulating channels having separate pneumatic circuits, each pressure regulating channel is assigned at least one dedicated storage pressure port which can be connected to a dedicated compressed air store, and in which the pneumatic flow paths of each pressure regulating channel are formed so as to be pneumatically separate, at least proceeding from the respective storage pressure port as far as the respective working pressure port, from the pneumatic flow paths of a respective other pressure regulating channel.