Trailer Brake Valve Control via Signal Threshold
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In vehicles equipped with pneumatic or hydraulic braking systems, the trailer vehicle may not be braked during a braking process due to defects in the brake value sensor or electrical switch, leading to an unbraked state, especially when the brake value signal is zero or faulty, causing the backup valve to be deactivated and no brake control pressure to be output.
Innovation Solution
The method involves using the brake value sensor to determine an incipient braking process and only deactivating the backup valve if the detected brake value signal reaches or exceeds a predefined minimum signal value, ensuring that the trailer vehicle is braked by maintaining the backup valve activated even if the sensor or switch fails, thus preventing an unbraked state without additional equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backup valve is deactivated when the brake value signal is zero or faulty, then the electronic control system operates efficiently, but the trailer vehicle may not be braked during a braking process
Solution Approach 1:
The control method performs preliminary assessment by evaluating multiple signals (electrical switch state, brake value signal presence, and minimum signal value threshold) before deactivating the backup valve. This preliminary action ensures that the backup valve is only deactivated when all indicators confirm a valid braking process, preventing premature deactivation that would compromise braking reliability.
Solution Approach 2:
The control method implements feedback mechanisms by continuously monitoring the brake value signal from the brake value sensor and comparing it against a predefined minimum signal value. This feedback loop ensures that the backup valve remains activated whenever the brake value signal falls below the threshold or is absent, providing continuous verification of the braking state and preventing false deactivation.
2Reliability
If the backup valve remains activated to ensure trailer braking, then braking safety is maintained, but the system may not respond efficiently during normal braking operations
Solution Approach 1:
The control method changes the operational parameters of the backup valve based on the brake value signal characteristics. When the brake value signal exceeds the minimum threshold and all braking conditions are met, the backup valve is deactivated to improve response efficiency. When the signal drops below the threshold or braking conditions are not met, the backup valve remains activated to ensure safety. This dynamic parameter adjustment resolves the contradiction between safety and efficiency.
Solution Approach 2:
The control method introduces dynamic behavior to the backup valve system, allowing it to switch between activated and deactivated states based on real-time braking conditions. The electrical switch state, brake value signal presence, and minimum signal value threshold create a dynamic control framework that adapts the backup valve status to current operational needs, ensuring both safety and efficiency.
3Measurement precision
If additional equipment is added to detect sensor failures, then detection accuracy improves, but the device complexity increases
Solution Approach 1:
The control method implements self-service by using existing system components (electrical switch, brake value sensor, and control unit) to detect and respond to sensor failures. The control unit monitors the brake value signal and compares it against the minimum signal value threshold, allowing the system to self-diagnose potential failures without requiring additional detection equipment. This approach maintains high measurement precision while avoiding increased device complexity.
Solution Approach 2:
The control unit performs multiple functions: it processes the electrical switch signal, monitors the brake value signal, compares the signal against the minimum threshold, and controls the backup valve activation. By making the control unit universal and multi-functional, the system achieves accurate sensor failure detection without adding dedicated detection equipment, thereby maintaining simplicity while improving measurement precision.
Data Source
AI summary
A method includes steps for controlling a pneumatic braking system of a trailer vehicle which is connected to a tow vehicle equipped with a hydraulic or pneumatic braking system. At the start of an actuation of the foot brake valve, an electrical switch is closed or opened, and a switching signal is transmitted to an electronic control unit as a braking start signal for an incipient braking process. A brake value sensor detects a brake value representative of the drivers current deceleration request and transmits the brake value to the electronic control unit as a brake value signal. The brake value sensor is used for determining the incipient braking process, and a backup valve is only deactivated by switching a redundancy valve from an open position to a blocking position if the brake value signal detected by the brake value sensor has reached or exceeded a predefined minimum signal value.