Valve Module Air Flow Control for Autonomous Braking
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Solution Overview
Problem
Existing heavy vehicle air braking systems face challenges in improving the performance of autonomous braking events, such as hill start assist, due to limitations in controlling air flow and pressure distribution efficiently.
Innovation Solution
A valve module comprising a relay valve, solenoid valves, and a one-way check valve, which are interconnected to control air flow and pressure distribution in response to electrical signals from a controller, enabling precise control of air flow to the brake chambers for autonomous braking events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional air braking system is used, then the structure is simple, but the performance of autonomous braking events is insufficient
Solution Approach 1:
The braking system is divided into multiple independent control channels, each with its own solenoid valve and control logic. The first solenoid valve controls air flow from the air supply to the brake chamber, while the second solenoid valve controls air discharge. This segmentation allows independent optimization of each control function, improving autonomous braking performance while maintaining manageable system complexity through modular design.
Solution Approach 2:
The system employs dynamic pressure control through variable cross-sectional areas of throttling holes. The first throttling hole area and second throttling hole area can be independently adjusted to modulate air flow rates during different phases of braking operation. This dynamic adjustment capability enables precise control of brake chamber pressure buildup and release rates, enhancing autonomous braking event performance.
2Productivity
If air flow control is simplified, then the device complexity is reduced, but the pressure distribution efficiency deteriorates
Solution Approach 1:
Different throttling holes are designed with different cross-sectional areas to create localized flow characteristics optimized for specific functions. The first throttling hole is sized for controlled air supply during brake application, while the second throttling hole is sized for controlled air discharge during brake release. This local quality differentiation enables efficient pressure distribution without requiring complex active control mechanisms.
Solution Approach 2:
The system utilizes variable pressure parameters achieved through the interaction of multiple solenoid valves and throttling holes. By changing the opening states of the first and second solenoid valves and adjusting the throttling hole areas, the air flow rate and pressure in the brake chamber can be precisely controlled. This parameter control approach improves pressure distribution efficiency while maintaining relatively simple device structure.
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
The solution enhances the performance of autonomous braking events by ensuring efficient air flow and pressure control, improving the vehicle's ability to prevent rolling back on inclines and extending the life of braking components through variable pressure modulation.
Implementation Method 1
a first solenoid valve having a first solenoid, at least one supply port, and a delivery port connected in fluid communication with the control port of the relay valve, wherein the first solenoid is responsive to a first electrical signal from the controller
Data Source
AI summary
A valve module is provided for enabling a vehicle to control an autonomous event of the vehicle. The valve module comprises a relay valve, a first solenoid valve, and a second solenoid valve. A first control pressure can be delivered through the first solenoid valve and applied to a control port of the relay valve. In one embodiment, a second control pressure can be delivered through the second solenoid valve and combined with the first control pressure. The combined first and second control pressures are applied to the control port of the relay valve.