Fuse Resistance Diagnostics via Voltage and Current Sensing
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Solution Overview
Problem
The existing diagnostic systems for electrical fuses fail to accurately detect the degrading phenomenon, leading to potential explosions or fires due to increased resistance, which complicates maintenance and safety in vehicles.
Innovation Solution
A vehicle diagnostic system that includes voltage sensors, current sensors, and a microcontroller to determine the resistance of an electrical fuse by comparing measured values to stored beginning-of-life or end-of-life resistance values, generating a diagnostic signal if the fuse has degraded, and displaying a servicing message if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrical fuse is designed to operate at end-of-life resistance, then the fuse provides reliable protection, but the fuse may degrade beyond end-of-life resistance causing explosion or fire
Solution Approach 1:
The diagnostic system performs preliminary detection of fuse resistance degradation before the fuse reaches its end-of-life resistance. By continuously monitoring resistance and comparing it against stored end-of-life values, the system identifies degradation trends early and generates diagnostic signals, preventing the fuse from degrading to dangerous levels that could cause explosion or fire.
2Reliability
If a diagnostic system is implemented to detect fuse degradation, then safety is improved, but the diagnosing circuit complexity increases
Solution Approach 1:
The diagnostic system utilizes the existing microcontroller and sensor infrastructure already present in modern vehicles. The microcontroller reads voltage and current signals from existing sensors, calculates fuse resistance using standard electrical formulas, and compares the calculated resistance against end-of-life values stored in memory. This self-service approach enables comprehensive fuse monitoring without adding separate dedicated diagnostic hardware circuits.
Solution Approach 2:
The diagnostic system leverages the multi-functionality of existing vehicle electronics. The same microcontroller that manages other vehicle functions is used for fuse resistance calculation and diagnostic signal generation. Existing voltage and current sensors serve dual purposes for both normal vehicle operation and fuse degradation detection, eliminating the need for separate dedicated diagnostic components.
3Measurement precision
If the fuse resistance is monitored continuously, then degradation is detected early, but the measurement precision requirements increase
Solution Approach 1:
The diagnostic system performs periodic resistance measurements by sequentially applying different test currents to the fuse and measuring the corresponding voltage drops. Instead of continuous monitoring that would require extremely high precision at all times, the system takes periodic snapshots of fuse resistance under varying current conditions, accumulating data points that reveal degradation trends over time.
Solution Approach 2:
The system dynamically adjusts measurement parameters based on operating conditions. It monitors resistance under varying current loads and temperature conditions, adapting its diagnostic approach to the actual operational state of the vehicle. This dynamic measurement strategy allows accurate degradation detection using standard precision sensors rather than requiring ultra-high precision continuous monitoring.
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
Enables early detection of degraded electrical fuses, enhancing safety and maintenance by accurately determining when a fuse has reached its end-of-life, preventing potential explosions and improving reliability.
Implementation Method 1
a first voltage sensor that generates a first signal indicating a first voltage level at a first end of the electrical fuse
Implementation Method 2
a current sensor generating a third signal indicating an amount of electrical current flowing through the electrical fuse
Implementation Method 3
The microcontroller determines a first resistance value of the electrical fuse utilizing the first voltage value, the second voltage value, and the current value
Implementation Method 4
the electrical fuse is operated to be melted by the heat generated due to the overcurrent flowing on the wire
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A vehicle having a diagnostic system for a fuse is provided. The vehicle has first and second voltage sensors, a current sensor, and a microcontroller. The first and second voltage sensors generate first and second signals, respectively, indicating first and second voltage levels, respectively, at first and second ends, respectively, of the fuse. The current sensor generates a third signal indicating a current level flowing through the fuse. The microcontroller determines first and second voltage values based on the first and second signals, respectively, a current value based on the third signal, and a first resistance value utilizing the first and second voltage values and the current value. The microcontroller generates a diagnostic signal indicating degraded operation of the fuse if the first resistance value is greater than an end-of-life resistance value.