Trailer Brake Controller Dual-Channel Signal Validation
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Solution Overview
Problem
In North America, trailers with pneumatic brake installations receive brake signals only via a pneumatic line, resulting in significantly longer response times compared to European trailers, which use a standardized electrical data connection, and existing wireless connections pose risks.
Innovation Solution
An electronic brake system for trailers that uses a dual communication channel setup, where brake signals are wirelessly transmitted and converted into pneumatic brake commands only if they arrive synchronously or within a defined time window on both channels, ensuring accurate and timely braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If brake signals are transmitted only via pneumatic line, then system reliability is maintained, but braking response time increases significantly
Solution Approach 1:
The signal transmission path is segmented into two independent channels: a primary wireless channel for fast response and a secondary pneumatic channel for reliability verification. This segmentation allows the system to exploit the speed advantage of wireless transmission while maintaining the reliability guarantee of pneumatic transmission through parallel verification.
Solution Approach 2:
The control unit acts as an intermediary that receives signals from both channels and mediates between them by comparing timing coherence. It uses the pneumatic channel as a reference mediator to validate wireless signals, ensuring that only synchronized signals trigger braking actions.
2Speed
If wireless communication channel is used, then braking response time is reduced, but risk of erroneous brake signals increases
Solution Approach 1:
The system implements feedback by continuously monitoring the timing relationship between wireless and pneumatic signals. The control unit compares the arrival times of brake signals from both channels and uses this feedback to validate the authenticity of wireless signals, rejecting those that do not exhibit expected temporal coherence with the pneumatic channel.
Solution Approach 2:
The system performs preliminary verification by checking timing coherence between channels before executing braking actions. The control unit预先 establishes a time window based on known signal transmission characteristics and validates incoming wireless signals against this criterion before triggering the brake system, preventing erroneous signals from causing unintended braking.
3Reliability
If dual communication channels with synchronization check are used, then signal reliability is improved, but system complexity increases
Solution Approach 1:
The control unit is designed with multi-functionality, serving both as the primary controller for pneumatic brake activation and as a timing coherence analyzer for validating wireless signals. This universal design eliminates the need for separate dedicated validation hardware, reducing overall system complexity while maintaining dual-channel operation.
Solution Approach 2:
The system uses its existing pneumatic brake infrastructure to serve the additional function of wireless signal validation. The pneumatic channel, already present for traditional brake operation, is simultaneously utilized as a reference channel for timing comparison, allowing the system to self-validate wireless signals without requiring external verification systems.
Data Source
AI summary
An electronic brake system for a trailer with a pneumatic brake installation is disclosed. The electronic brake system comprises a brake controller (18) in the trailer (11) connected to a first communication device (20) that is part of a first communication channel (23) for wirelessly receiving brake signals of a towing vehicle (10). The electronic brake system also comprises a second communication channel for receiving brake signals of the towing vehicle. The brake controller (18) converts the brake signals of the first communication channel (23) into brake commands for the pneumatic brake installation only if brake signals arrive via the second communication channel (24) at the same time or within a defined time window. The time window begins as soon as a brake signal arrives on one of the first and second communication channels (23, 24).