Pneumatic Brake Valve Control for Tractor-Trailer Mode Switching
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Solution Overview
Problem
Current pneumatic braking systems for vehicle combinations, such as trucks and trailers, lack the ability to easily switch between different braking modes and apply the correct type of brakes during various operating conditions, particularly requiring a simple method for mode selection.
Innovation Solution
A pneumatic arrangement with a manually controllable brake actuator that connects to both the tractor and trailer units, utilizing a first and second valve arrangement to control the flow of pressurized air to the parking brake cylinders, allowing for simultaneous activation or release of parking brakes from inside the cabin, and optional secondary brake mode engagement during driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional pneumatic braking system is used for vehicle combinations, then the basic braking functionality is provided, but the ability to easily switch between different braking modes and apply the correct type of brakes during various operating conditions is lacking
Solution Approach 1:
The manually controllable brake actuator is designed to perform multiple functions: it can activate parking brakes for both tractor and trailer units, engage secondary brakes for the trailer unit, and switch between different braking modes. This multi-functional design allows a single device to replace what would otherwise require multiple separate control mechanisms, thereby improving adaptability without proportionally increasing complexity.
Solution Approach 2:
The system incorporates dynamic mode selection capability where the brake actuator can switch between different braking modes (parking brake mode and secondary brake mode) based on operational requirements. The valve arrangements dynamically redirect pneumatic flow to achieve different braking configurations, enabling the system to adapt to various operating conditions while maintaining a relatively simple physical structure.
2Ease of operation
If the operator manually activates the trailer parking brake from outside the vehicle, then the parking brake functionality is achieved, but the operator must leave the cabin which reduces operational efficiency and safety
Solution Approach 1:
The brake actuator integrates control capabilities for both tractor and trailer parking brakes into a single device located inside the cabin. When the operator actuates this combined control device, pneumatic signals are simultaneously transmitted through the valve arrangements to both the tractor parking brake cylinder and the trailer parking brake cylinder, enabling simultaneous activation of both parking brakes from within the cabin without requiring the operator to exit.
Solution Approach 2:
The valve arrangements act as intermediaries that translate the single operator input from the brake actuator into coordinated pneumatic signals for both parking brake systems. The first valve arrangement manages the tractor parking brake outlet while the second valve arrangement manages the trailer parking brake outlet, both responding to the same manual actuation signal, thereby eliminating the need for separate manual interventions.
3Ease of operation
If a simple manually controllable brake actuator is used, then the ease of operation is improved, but the ability to provide multiple braking modes (parking brake and secondary brake) may be compromised
Solution Approach 1:
The valve control system is segmented into two distinct valve arrangements: the first valve arrangement connected to the tractor parking brake outlet and the second valve arrangement connected to the trailer parking brake outlet. Each valve arrangement can be independently controlled by the single brake actuator, allowing the system to provide multiple braking modes (parking brake for tractor only, parking brake for trailer only, or both simultaneously) while maintaining simple manual operation through one control device.
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
Enables the operator to apply and release parking brakes for both the tractor and trailer units from the cabin, improving braking functionality and safety by allowing rapid engagement and disengagement of brakes, especially at low speeds and during secondary brake modes.
Implementation Method 1
a pneumatic arrangement for a braking system of a vehicle comprising a tractor unit and at least one trailer unit... a first valve arrangement connected to, and controllable by, the manually controllable brake actuator... a second valve arrangement connected to, and controllable by, the manually controllable brake actuator... upon actuation of the manually controllable brake actuator, the pneumatic arrangement is operable to assume a parking brake mode
Data Source
AI summary
A pneumatic arrangement for a braking system of a vehicle, the pneumatic arrangement comprising a manually controllable brake actuator, a trailer parking brake outlet connectable to a parking brake cylinder of the at least one trailer unit, a tractor parking brake outlet connectable to a parking brake cylinder of the tractor unit, a first valve arrangement, and a second valve arrangement, wherein the pneumatic arrangement is operable to assume a parking brake mode in which the first valve arrangement is controlled to arrange the tractor parking brake outlet in fluid communication with an air outlet, and the second valve arrangement is controlled to arrange the trailer parking brake outlet in fluid communication with the air outlet.