Brake Controller Tester Using Resistor Networks to Mimic Trailer Brakes
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Solution Overview
Problem
Modern brake controllers in tow vehicles, which use pulse-width modulation and load monitoring circuits, complicate the process of testing for proper operation of electric trailer brakes, making it difficult for technicians to verify the connection and functionality of trailer brakes.
Innovation Solution
A brake tester apparatus with data processor, brake simulation circuitry, and display circuitry that mimics the electrical signature of electric trailer brakes by sequentially applying parallel resistors to the brake control signal, allowing for integration and display of the simulated brake control signal, thereby simulating a properly connected trailer and indicating commanded brake force and low pulse amplitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If modern brake controllers use PWM and load monitoring circuits, then brake control effectiveness and trailer identification are improved, but testing complexity increases
Solution Approach 1:
The patent creates a simplified copy of the trailer brake system using resistors that mimic the electrical signature of actual trailer brakes. Instead of requiring a complete trailer setup for testing, the invention uses resistor networks (R1-R4) configured to replicate the inductive characteristics and current rise patterns that modern brake controllers expect from genuine electric brakes, enabling comprehensive testing without complex physical trailers.
Solution Approach 2:
The patent introduces an intermediary testing device that sits between the brake controller and the actual trailer brakes. This intermediary system uses op-amps, resistors, and capacitors to create a simulation environment that translates the controller's PWM signals into measurable electrical characteristics, allowing technicians to test controller functionality without directly connecting to a trailer.
2Measurement precision
If load monitoring circuits are added to identify properly connected trailers, then trailer connection verification is improved, but difficulty of testing increases
Solution Approach 1:
The patent changes the electrical parameters of the simulation circuit to match the expected characteristics of trailer brakes. By carefully selecting resistor values and configurations, the circuit replicates the specific current rise time, resistance values, and electrical signature that load monitoring circuits look for, allowing precise simulation of properly connected trailer conditions without requiring actual trailer hardware.
Data Source
AI summary
An apparatus is described that receives a brake control signal from the brake controller of a tow vehicle, and displays characteristics of that brake control signal including commanded brake force. The apparatus includes a data processor, brake simulation circuitry, brake integration circuitry, and display circuitry. The brake simulation circuitry sequentially applies several parallel resistors to the brake control signal in response to commands received from the data processor. These parallel resistors cause the load current on the brake controller to ramp up, mimicking the electrical signature of electric trailer brakes. At the same time, the brake integration circuitry integrates the brake control signal. Lastly, the display circuitry displays an indication of a value of the integrated brake control signal.