Trailer Control System Sequence for Tire Protection
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Solution Overview
Problem
Motor vehicle trailers with air suspension, service brake, and parking brake often face issues where the trailer is driven away without the air suspension being raised to the intended level, leading to potential tire damage and inaccurate brake pressure due to incomplete pneumatic system operation.
Innovation Solution
A control system that secures the service brake, parking brake, and air suspension in a specific order, ensuring the air suspension is operational before the parking brake is released, using overflow valves and switching valves to maintain the correct pressure and operational sequence, preventing tire damage and ensuring accurate brake pressure adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the parking brake is released before the air suspension is fully pressurized, then the trailer can be driven away faster, but the tire sidewalls may be damaged by contact with the fenders and the brake pressure will be inaccurate
Solution Approach 1:
The system performs preliminary pressurization of the air suspension system before allowing the parking brake to be released. The sequence control ensures that the air suspension reaches the required pressure level first, then the parking brake release is enabled, preventing tire damage and ensuring accurate brake pressure from the outset
Solution Approach 2:
A sequence control valve acts as an intermediary between the air suspension system and the parking brake system. This valve mediates the pressure distribution, ensuring that the air suspension is pressurized first and only after reaching the correct pressure can the parking brake system access the required air pressure for release
2Reliability
If the air suspension is pressurized to the correct level before departure, then the chassis is properly positioned and brake pressure is accurate, but the system requires more time to reach operational state
Solution Approach 1:
The pneumatic system is segmented into separate circuits with different pressure requirements - the air suspension circuit and the brake circuit. The sequence control valve divides the air supply to ensure proper pressurization sequence, allowing the system to reach operational state efficiently without unnecessary delays
3Device complexity
If a single pneumatic system supplies both the air suspension and parking brake, then the system structure is simpler, but the pressure required for brake release may not be available if the suspension is not yet pressurized
Solution Approach 1:
A sequence control valve is introduced as an intermediary component in the pneumatic system. This valve maintains system simplicity while ensuring reliable operation by controlling the sequence of air distribution - it prevents the parking brake from accessing air pressure until the air suspension has been properly pressurized first
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
Ensures the trailer is raised to the intended level and the brake pressure is adjusted correctly, preventing tire damage and ensuring safe operation by ensuring the air suspension is operational before the parking brake is released.
Implementation Method 1
an overflow valve is arranged in a line leading to the air spring bellows and in a line leading to the parking brake cylinder units, with the overflow valve in the line leading to the parking brake cylinder units being set to a comparatively higher opening pressure
Data Source
Figure 1
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AI summary
The system (1) has a driving brake (8) provided with a control valve and an operating brake cylinder (12). A hand brake (10) is provided with a hand brake valve (31) and hand brake cylinder units (30). A pneumatic spring (9) is provided with a level regulating valve (26) and air suspension bellows (24). The driving brake, the hand brake and the pneumatic spring are secured against each other such that the driving brake, the pneumatic spring and the hand brake are transferred in an operative condition when filling the control system with compressed air. An independent claim is also included for a method for operating a control system for motor vehicle trailers.