Trailer Brake Current Detection for Reverse Battery Protection

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Solution Overview

Problem

Existing braking systems for towed vehicles do not effectively detect and respond to reverse battery conditions, leading to potential overcurrent issues and limited operability during trailer testing.

Innovation Solution

A braking system with a current detector and switch mechanism that detects current flow and controls electrical connection/disconnection based on current conditions, including a shunt, current sense amplifier, comparator, and latch circuit to manage brake signals and provide user notifications for reverse battery conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a braking system is used for towed vehicles, then braking functionality is provided, but the system cannot detect reverse battery conditions leading to potential overcurrent damage

Engineering Contradiction:

Improvebraking system reliabilityVSAvoidovercurrent damage risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The current detector is configured to detect current flow before it can cause damage to the drive circuitry. The system proactively monitors current conditions and prevents harmful overcurrent situations from developing, rather than reacting after damage occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces a current detector as an intermediary component between the power source and the drive circuitry. This mediator monitors current flow and provides warning signals, acting as an early detection system that bridges the gap between power delivery and circuit protection.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the braking system operates without reverse battery detection, then the system remains simple, but operability is limited during trailer testing

Engineering Contradiction:

Improvetrailer testing operabilityVSAvoidbraking system complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The braking system performs self-diagnosis by automatically detecting reverse battery conditions through the current detector. The system monitors its own operational state and provides self-service warning signals, eliminating the need for external testing equipment or complex manual diagnostic procedures.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system detects reverse battery conditions by monitoring changes in current flow parameters. When the current detector identifies abnormal current patterns indicative of reverse battery connection, the system changes its operational state and provides warnings, enabling easy detection of installation errors.

Inventive Principle:

Principle #35Parameter changes

3Loss of information

If no current detection mechanism is implemented, then the braking system has fewer components, but the system cannot provide user notifications for reverse battery conditions

Engineering Contradiction:

Improvereverse battery condition informationVSAvoiddetection system complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The current detector provides feedback about the electrical connection status to the user. When reverse battery conditions are detected, the system generates warning signals that feed back to the user, closing the information loop and enabling timely correction of installation errors.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces complex mechanical diagnostic systems with an electrical current detection mechanism. By using electrical parameters (current flow direction and magnitude) to detect reverse battery conditions, the system achieves sophisticated monitoring with simpler electronic components rather than mechanical switches or physical inspection mechanisms.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical 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

Enhances detection and response to overcurrent conditions, prevents inoperability, and provides user notifications for reverse battery issues, ensuring reliable operation and improved safety in towing scenarios.

Implementation Method 1

A shunt is in series with the switch. At least one current sense amplifier is configured to output a voltage representative of current through the shunt

Methodology Applied

Scientific EffectOhm's Law: Ohm's Law

Implementation Method 2

at least one current sense amplifier having programmable gain and configured to output a voltage representative of current through the shunt

Methodology Applied

Scientific EffectElectrical signal amplification:

Implementation Method 3

a comparator configured to control the switch in response to the voltage representing the current flowing through the drive circuitry

Methodology Applied

Scientific EffectVoltage comparison:

Data Source

PatentUS12589720B2Braking system and current detection therefor

Publication Date: 2026.03.31 FORD GLOBAL TECH LLC

AI summary

A braking system includes drive circuitry configured to communicate a brake signal from a towing vehicle to a towed vehicle connected to the towing vehicle, an output node configured to carry the brake signal, and a switch electrically interposing the drive circuitry and the output node. A current detector is in series with the switch and is configured to detect a current through the drive circuitry. The switch is configured to electrically connect and electrically disconnect the drive circuitry from the output node in response to the current.