Trailer Gladhand Connection Detection by Pneumatic Line Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems for determining whether a trailer is connected to a truck and, if so, at which location, are unreliable and costly, often requiring manual selection or additional sensors that can be damaged by frequent coupling and uncoupling.
Innovation Solution
A pneumatic system that includes a first and second selector valve, a pneumatic control line, and a solenoid valve, which performs a pneumatic line test to determine if a trailer is connected and to which pair of gladhand couplers, allowing for automatic connection and reducing the need for additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual selection is used to determine trailer connection status, then the system is simple and cost-effective, but the reliability is poor due to human error
Solution Approach 1:
The system automatically detects trailer connection status and location without requiring manual intervention. The control unit autonomously determines whether a trailer is connected and identifies the connection location (first or second pair of gladhand couplers), eliminating human error while maintaining system simplicity through automated pneumatic sensing.
2Measurement precision
If additional sensors are added at the gladhand couplers to detect connection status, then the measurement precision improves, but the device complexity and cost increase
Solution Approach 1:
The existing pneumatic lines (trailer air pressure supply line and trailer service brake line) serve dual functions: both providing pneumatic connectivity to the trailer and enabling connection status detection. The control unit utilizes the pneumatic state of these existing lines to determine connection status and location, eliminating the need for additional dedicated sensors.
Solution Approach 2:
The control unit acts as an intelligent intermediary that interprets the pneumatic state of the existing lines to infer connection status. Instead of adding physical sensors at the couplers, the system uses the pneumatic pressure and flow characteristics of the existing lines as indirect indicators of connection status and location.
3Reliability
If additional sensors are installed at the gladhand couplers, then the connection detection capability improves, but the sensors are vulnerable to damage from frequent coupling and uncoupling
Solution Approach 1:
The detection function is extracted from the mechanical gladhand couplers and relocated to the pneumatic control system. By removing sensors from the mechanical coupling interface and using only the pneumatic lines for detection, the system eliminates the vulnerability of sensors to mechanical damage while maintaining reliable connection detection capability.
4Adaptability or versatility
If the truck is equipped with two pairs of gladhand couplers for flexible trailer connection, then the adaptability improves, but the difficulty of detecting and measuring connection location increases
Solution Approach 1:
The system divides the detection function into two separate detection paths, one for each pair of gladhand couplers. The control unit independently evaluates the pneumatic state of lines connected to the first pair and the second pair, allowing clear identification of which specific location is connected. This segmented approach simplifies location identification compared to a unified detection system.
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 provides a reliable and cost-effective method to determine trailer connection status and location, reducing the risk of manual error and sensor damage, while maintaining a fail-safe configuration.
Implementation Method 1
a solenoid valve which has a non-activated state in which the pneumatic control line is not pressurized, and an activated state in which the pneumatic control line is pressurized
Implementation Method 2
wherein at least one pneumatic line test is performed while the solenoid valve is in the non-activated state
Data Source
AI summary
The present disclosure relates to a pneumatic system for a truck having a first pair of couplers, typically gladhand couplers and a second pair of couplers, typically gladhand couplers, with only one pair used at a time for coupling a trailer, the system being able to detect which pair of glad hands a trailer is connected to. The present disclosure also relates to a truck comprising a pneumatic system according to the invention and a method carried out in a pneumatic system according to the invention.