Electro-Pneumatic Brake Valve Layout for Fast, Precise Pressure Control
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Solution Overview
Problem
Existing electro-pneumatic braking systems for commercial vehicles face challenges in achieving quick and accurate pressure regulation of the brake chamber, leading to long response times and inadequate braking performance, especially in automatic driving scenarios.
Innovation Solution
The proposed automatic pressure regulating valve for an electro-pneumatic braking system includes a complex valve structure with multiple switching and quick-acting valves, along with a control method that utilizes a controller to manage the opening and closing of these valves based on real-time pressure feedback, ensuring precise regulation of brake chamber pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional ABS valve and relay valve are used to regulate brake chamber pressure, then the braking system can operate, but the pressure response time is long and regulation accuracy is insufficient
Solution Approach 1:
The patent segments the braking control system into multiple independent functional modules: normally open switching valve for mode selection, normally open quick-acting intake valve for primary air supply, quick-acting exhaust valve for pressure release, and relay valve for pressure amplification. Each valve operates independently with dedicated control channels, eliminating the bottleneck of traditional single-valve systems and achieving rapid, accurate pressure regulation.
Solution Approach 2:
The patent introduces a control chamber as an intermediary between the electronic control system and the brake chamber. The control chamber receives precisely regulated air from multiple quick-acting valves, which then controls the relay valve to amplify the pressure signal. This intermediary mechanism enables accurate pressure control that is then magnified to the required braking force, solving both accuracy and response time issues.
2Reliability
If a one-way valve structure is used in the automatic pressure regulating valve, then the valve structure is simple, but the air in the control chamber cannot be vented in case of electronic control failure
Solution Approach 1:
The patent inverts the traditional one-way valve approach by implementing a dual-mode valve system. The normally open switching valve and normally open quick-acting intake valve are designed to be normally open rather than normally closed, allowing automatic fail-safe operation. When electronic control fails, these valves remain open, automatically enabling manual braking mode through the pedal valve, thus ensuring safety without requiring complex additional venting mechanisms.
Solution Approach 2:
The normally open switching valve serves multiple functions: it controls the selection between manual and electronic braking modes, provides a default safe state when electronics fail, and works in conjunction with the normally open quick-acting intake valve to ensure continuous air supply. This multi-functionality achieves fail-safe operation without requiring separate dedicated venting valves, maintaining structural efficiency while improving reliability.
3Speed
If multiple switching valves and quick-acting valves are added to achieve rapid pressure regulation, then the pressure response time is reduced, but the valve structure becomes more complex
Solution Approach 1:
The patent merges the functions of multiple valves into a coordinated system where the normally open switching valve, normally open quick-acting intake valve, and quick-acting exhaust valve work together through a common control chamber. This merging approach allows parallel operation of intake and exhaust paths, achieving rapid pressure response while sharing control logic and reducing overall system complexity compared to sequential valve arrangements.
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 enables rapid and accurate pressure regulation of the brake chamber, significantly improving braking performance and ensuring reliable operation in both manual and automatic driving modes, including a "fail-safe" function for safety backup.
Implementation Method 1
a coil, and an electromagnetic valve core... the coil is connected to a controller... When the coil is de-energized, the movable iron core and the electromagnetic valve core are situated at an upper limit position under the action of a spring force, and the manually controlled air inlet a is communicated with the air outlet c. When the coil is energized, the movable iron core presses down the electromagnetic valve core and the spring
Implementation Method 2
When the coil is de-energized, the movable iron core and the electromagnetic valve core are situated at an upper limit position under the action of a spring force
Implementation Method 3
The piston moves down to push the main valve core to compress the main spring
Data Source
AI summary
An automatic pressure regulating valve for an electro-pneumatic braking system of a commercial vehicle comprises an upper valve body and a lower valve body. The upper valve body includes a normally open switching valve, a quick-acting intake valve, a normally open quick-acting intake valve, a quick-acting exhaust valve, and a control chamber A. A lower valve body includes a relay valve and a working chamber B. The normally open switching valve has a manually controlled air inlet a and an electronically controlled air inlet b, and an air outlet c connected to an air inlet d of the normally open quick-acting intake valve. An air outlet e of the normally open quick-acting intake valve, an air inlet f of the quick-acting exhaust valve and an air outlet i of the quick-acting air intake valve are connected together to the control chamber A.