Parking Brake Valve Selective Axle Release
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Solution Overview
Problem
Existing parking brake systems for vehicles with multiple axles often experience unwanted vehicle torsion during lifting or lowering movements, as both axles are typically braked simultaneously, leading to inefficiencies and potential safety issues.
Innovation Solution
A parking brake system with selectively releasable axle parking brake devices, controlled by a parking brake valve that allows for independent activation and deactivation of each axle, preventing torsion while maintaining the parking brake effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both vehicle axles are braked simultaneously by the parking brake system, then the parking brake effect is improved, but vehicle torsion occurs during lifting or lowering movements
Solution Approach 1:
The parking brake system is segmented into separate control for first and second axle parking brake devices. The control unit can independently activate or deactivate each axle's parking brake, allowing selective braking of individual axles rather than forcing both axles to be braked simultaneously. This segmentation resolves the contradiction by enabling the parking brake effect to be maintained through selective axle braking while avoiding vehicle torsion during lifting or lowering operations.
2Object-affected harmful factors
If a parking brake valve is added to enable selective release of axle parking brake devices, then vehicle torsion is prevented, but device complexity increases
Solution Approach 1:
The parking brake valve is designed with multi-functionality to manage multiple axles through a single component. It can selectively supply pressurized fluid to either the first axle parking brake device, the second axle parking brake device, or both simultaneously, depending on the activation state. This universal design prevents vehicle torsion while avoiding the need for separate complex control systems for each axle, thereby limiting the increase in device complexity.
3Object-affected harmful factors
If pressurized fluid is supplied to release one axle parking brake device during lifting, then vehicle torsion is prevented, but loss of parking brake effect on other axles occurs
Solution Approach 1:
The control unit implements local quality by allowing pressurized fluid to be supplied selectively to specific axle parking brake devices based on local conditions. During lifting or lowering operations, only the axle that needs to be released to prevent torsion is targeted with pressurized fluid, while other axles maintain their braking state. This localized approach prevents vehicle torsion while preserving the parking brake effect on axles that do not require release.
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 system effectively prevents vehicle torsion during lifting or lowering by selectively releasing one or more axle parking brake devices, ensuring the vehicle remains securely braked and reducing the risk of unwanted rolling.
Implementation Method 1
supplying, in particular feeding with a pressurized fluid, to the first and/or second axle parking brake device for selective release
Implementation Method 2
The at least one parking brake valve can be actuated, in particular switched over, by a solenoid valve
Data Source
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AI summary
The parking braking system (100) has vehicle axles (4,28) that are provided with axle brake devices (5,27). A parking brake valve (7) formed of magnetic valve or directional valve is connected to the axle brake devices such that the axle brake devices are selectively released. The axle brake devices are connected with brake relay valve (22) and fluid supply sources (14a,14c) respectively in two different positions of the parking brake valve. An independent claim is included for method for controlling parking brake system.