Fuel Cell DC-DC Converter Fault Diagnosis Timing
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Solution Overview
Problem
Fuel cell vehicle systems face reliability issues due to malfunctioning sensors in low voltage DC-DC converters and controllers, which are not effectively diagnosed or monitored, leading to potential failures and reduced system stability.
Innovation Solution
A method and system utilizing a central processing unit to determine the start timing for fault diagnosis of low voltage DC-DC converters and controllers, detecting deviations in sensor voltages, and identifying failures by comparing driving cycles with preset thresholds, thereby preventing malfunctions and enhancing system reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors and controllers are continuously monitored without condition-based diagnosis, then system reliability may improve, but device complexity and energy consumption increase
Solution Approach 1:
The patent applies preliminary action by determining specific start timing for fault diagnosis based on ignition conditions and driving conditions. The CPU is configured to start fault diagnosis at predetermined moments (e.g., during ignition intervals or when specific driving conditions are met) rather than continuously monitoring, which reduces system complexity while maintaining reliability through timely fault detection.
2Reliability
If fault diagnosis is performed continuously, then reliability increases, but energy consumption and loss of time increase
Solution Approach 1:
The patent implements periodic action by performing fault diagnosis at specific intervals determined by ignition conditions and driving conditions. The CPU executes voltage deviation checks periodically rather than continuously, consuming energy only when diagnosis is triggered by specific conditions such as ignition events or threshold-based driving parameters, thus reducing overall energy consumption while maintaining sensor reliability.
3Measurement precision
If fault diagnosis timing is determined by multiple conditions (ignition and driving conditions), then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by using multiple measurable parameters (ignition condition parameters and driving condition parameters) to determine fault diagnosis timing. The CPU evaluates changes in these parameters against predefined thresholds and conditions to precisely determine when to initiate diagnosis, improving measurement precision through multi-parameter assessment while managing complexity through systematic parameter evaluation.
Data Source
AI summary
A method and system for maintaining stability of a system of a fuel cell vehicle are provided to prevent malfunction of sensors of a low voltage DC-DC converter and the respective controllers. A start timing of a fault diagnosis for the low voltage DC-DC converter and the respective controllers is determined and a deviation between voltages of the sensors of the low voltage DC-DC converter and the respective controllers is detected to determine whether the low voltage DC-DC converter and the respective controllers fail.