Service Brake Backup Pressure Using a Third Air Circuit
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Solution Overview
Problem
Existing electronically controlled pneumatic service brake systems face challenges in achieving high reliability due to complex construction and assembly efforts, with a need for improved redundancy and efficiency in compressed air supply management.
Innovation Solution
The system incorporates independent compressed air supplies and control circuits, utilizing a third compressed air supply for redundancy, and pneumatically or electro-pneumatically actuated control signal generating means to ensure consistent brake pressure across control valves, potentially reducing the number of pneumatic channels and enhancing redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two independent compressed air supplies with separate control circuits are used for redundancy, then reliability is improved, but device complexity and assembly effort increase
Solution Approach 1:
The patent merges the pneumatic control signal generation for both brake circuits into a single integrated control module. The first and second control valves share common signal generating means that receives compressed air from either the first or second compressed air supply, eliminating the need for separate pneumatic control circuits while maintaining redundancy through independent compressed air supplies and independent electronic control units.
Solution Approach 2:
The control module is designed with universal functionality to serve both brake circuits. A single pneumatic control signal generating means can operate with either compressed air supply (first or second), and the control module can generate control signals for both first and second control valves, providing multi-functional capability that reduces overall system complexity while maintaining reliability.
2Reliability
If multiple independent compressed air supplies are used for redundancy, then reliability is improved, but the number of pneumatic channels and system complexity increase
Solution Approach 1:
The patent introduces a multi-functional control module as an intermediary that mediates between multiple compressed air supplies and the brake control circuits. This control module receives compressed air from either supply through a shared pneumatic connection and generates control signals for both brake circuits, thereby reducing the number of direct pneumatic channels needed while maintaining redundancy.
Solution Approach 2:
The patent combines the pneumatic control signal generation functions into a single control module that serves both brake circuits. Instead of having separate pneumatic channels from each compressed air supply to separate control circuits, the system merges these functions so that one control module can be supplied by either compressed air source and control both brake circuits.
3Reliability
If a third compressed air supply is used for control signal generation, then redundancy is improved, but system complexity increases
Solution Approach 1:
The control module is designed with universal capability to receive compressed air from multiple sources (first compressed air supply, second compressed air supply, or third compressed air supply) and generate control signals for both brake circuits. This multi-functional design allows the system to use a third compressed air supply for control signal generation without requiring separate dedicated circuits, as the same control module handles all pneumatic supply sources.
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 reliability by providing redundant pneumatic and electro-pneumatic controls, allowing the system to maintain functionality even with leaks in primary compressed air supplies, and reduces the complexity of the brake module by using existing commercial vehicle air systems, thus improving overall efficiency and reliability.
Implementation Method 1
control signal generating means which, depending on the vehicle target deceleration, generate the first pneumatic control pressure and feed it into the first pneumatic control input of the first control valve and generate the second pneumatic control pressure and feed it into the second pneumatic control input of the second control valve
Data Source
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AI summary
The invention relates to an electronically controlled pneumatic operating brake system (1) having a backup control pressure for a pneumatic fall-back level, which backup control pressure is generated on the basis of compressed air from a compressed air supply (C3) which is independent in relation to two compressed air supplies (C1, C2) for the front and rear axle brake circuit. An additional pneumatic redundancy is thus first of all ensured; in addition, a pneumatic channel in a foot brake module (FBM) can also be omitted.