Tractor Protection Valve Assembly Pneumatic Signal Delay
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Solution Overview
Problem
The existing tractor protection valve assemblies in electro-pneumatic brake systems are costly and energy-intensive due to long pneumatic signal delays and high energy consumption in long piping, which complicates assistance brake processes for trailers.
Innovation Solution
A compact tractor protection valve assembly with integrated solenoid valves and pneumatic valve equipment, eliminating the need for air piping between the front axle brake circuit and the valve, using electric control signals to manage pressure and control pressures within a single casing, reducing equipment costs and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If long pneumatic piping is used to connect the front axle brake circuit to the tractor protection valve assembly, then the system can transmit brake pressures, but signal delays increase and energy consumption rises
Solution Approach 1:
The patent replaces the mechanical pneumatic signal transmission system with an electronic control system. Electric control signals are used to actuate solenoid valves that directly control the pneumatic pressure delivery, eliminating the need for long pneumatic signal transmission lines and reducing both signal delay and energy loss.
Solution Approach 2:
The system separates the control function from the power transmission function. The electronic control unit generates control signals that are transmitted electrically to solenoid valves, which then control the pneumatic pressure delivery to the trailer brake circuit. This segmentation allows optimized transmission for each type of signal.
2Reliability
If separate pneumatic lines are used for supply pressure and control pressure transmission, then the brake system can function independently, but device complexity and equipment costs increase
Solution Approach 1:
The tractor protection valve assembly is designed to handle multiple functions through a unified interface. The same valve assembly manages both the supply pressure connection (line 120) and the control pressure transmission (line 121), eliminating the need for separate complex piping systems while maintaining independent circuit functionality.
3Productivity
If traditional pneumatic valve assemblies are used without integrated solenoid valves, then the system structure remains simple, but assistance brake processes become energy-intensive and slow
Solution Approach 1:
The patent integrates electrically actuated solenoid valves into the tractor protection valve assembly, replacing purely pneumatic actuation mechanisms. This allows the assistance brake processes to be controlled by electric signals from the electronic control unit, significantly reducing the energy required to actuate the valves and improving response speed.
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 reduces piping complexity, lowers total equipment costs, minimizes signal delays, and decreases energy consumption for pressure management, enabling efficient assistance brake functions for trailers.
Implementation Method 1
A compact tractor protection valve assembly with integrated solenoid valves and pneumatic valve equipment
Data Source
AI summary
An electro-pneumatic tractor protection valve assembly (8) including a trailer supply input (84) for receiving a supply pressure, a trailer service output (87) for delivering a trailer supply pressure, a first supply input (81) for receiving a primary driver brake pressure, a second supply input (82) for receiving a secondary driver brake pressure, a dual brake valve (14) actuated by a brake pedal (10) and supplying the brake control pressures, a vent opening (86) for venting an internal conduit, a first electrically controlled pneumatic valve (92) to receive a first electric control signal for trailer assistance braking, and a trailer control output (85) for delivering a trailer brake control pressure. The valve assembly includes one single casing (8a) accommodating the first supply input (81), the second supply input (82), the trailer supply input (84), the trailer control output (85), the vent opening (86) and the trailer service output (87).