Trailer Lamp Current Detection for Reliable Tractor Connection Sensing
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Solution Overview
Problem
Conventional methods struggle to determine trailer connection to a tractor accurately, especially with LED brake lights, which produce low current, and cannot adapt to varying trailer lamp capacities, leading to difficulties in detecting disconnected lamps.
Innovation Solution
A method involving a controller that turns on all trailer lamps after a preset operation, compares current variance with a reference value to determine connection, and checks for disconnected turn signal lamps using current output, with visual or auditory notifications for disconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If current measurement is used to detect trailer connection with LED brake lights, then power consumption is reduced, but detection reliability deteriorates due to low current
Solution Approach 1:
The controller performs a preliminary detection action by turning on all trailer lamps before normal operation to check connection status. This preliminary action allows the system to detect connection reliably without requiring high current during normal LED operation, thus maintaining low power consumption while ensuring detection reliability.
Solution Approach 2:
The controller applies partial action by selectively turning on only the minimum necessary lamps (brake lights and turn signal lights) for connection detection rather than all possible lamps. This reduces the current required for detection while still providing sufficient signal to determine connection status reliably.
2Measurement precision
If IPS output capacity is reduced to sense smaller currents from LED lamps, then detection sensitivity is improved, but maximum output capacity is reduced and cannot support large capacity lamps
Solution Approach 1:
The controller dynamically adjusts the detection strategy based on the detected current magnitude. When small current is detected (indicating LED lamps), the system uses the full sensitivity of the IPS. When larger current is detected (indicating traditional lamps), the system adapts by using alternative detection methods, thus maintaining both detection sensitivity for LEDs and support for high-capacity lamps.
Solution Approach 2:
The system changes the detection parameter from direct current magnitude measurement to a composite assessment that includes current variance analysis and temporal patterns. This allows the IPS to maintain its rated capacity while achieving sensitive detection of both LED and traditional lamps by analyzing multiple parameters rather than relying solely on current magnitude.
3Use of energy by moving object
If both left and right brake lights are disconnected, then power consumption is minimized, but it becomes difficult to determine whether brake lights are disconnected or trailer is not connected
Solution Approach 1:
The controller segments the detection process into multiple independent checks: it separately evaluates brake light connection status, turn signal light connection status, and overall trailer connection status. By segmenting the detection, the system can identify specific disconnection patterns even when power consumption is minimal, preventing loss of connection status information.
Solution Approach 2:
The system implements feedback by continuously monitoring the state of multiple lamps and comparing the detected pattern against expected configurations. When both brake lights appear disconnected, the feedback mechanism checks turn signal lights and other trailer components to determine whether this indicates actual disconnection or merely low power consumption state, thus preserving accurate connection status information.
Data Source
AI summary
A tractor and a method of sensing connection of a trailer to the tractor are provided. The trailer may include a plurality of lamps for informing a driver of a vehicle behind a tractor of the driving status of the tractor. The tractor may include a controller and a battery. The controller may sense that a set operation has been input by a driver. The controller may further determine to turn on all of the plurality of lamps as it senses that the set operation has been input. The controller may further determine whether the trailer is connected based on current output from the battery to turn on all of the plurality of lamps.