Voltage Sensor Abnormality Diagnosis via Power Consumption Estimation
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Solution Overview
Problem
Existing fault diagnosis apparatuses for voltage sensors struggle to accurately detect abnormalities, especially in devices with a wide voltage range, as they require adjustable detection thresholds and cannot directly estimate battery voltage from power calculations.
Innovation Solution
An abnormality diagnosis apparatus that estimates power consumption and voltage of an electric power supply using current detection values, allowing for direct comparison with voltage sensor readings to determine sensor abnormalities, with optional delay correction for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power-based fault diagnosis is used to detect voltage sensor abnormalities, then fault detection capability is provided, but detection accuracy deteriorates because battery voltage cannot be directly estimated from power calculations
Solution Approach 1:
The patent introduces power consumption as an intermediary parameter to bridge the gap between measurable quantities (current, torque, speed) and the target parameter (battery voltage). By calculating power consumption from readily available sensor data and using it to derive voltage estimates, the system enables accurate voltage sensor fault detection without directly measuring battery voltage
Solution Approach 2:
The patent replaces direct electrical voltage measurement with a computational approach using mechanical parameters (torque, speed) and electrical current to estimate voltage. This substitution allows voltage fault detection through calculation rather than direct sensing, improving accuracy by using multiple measurement points
2Adaptability or versatility
If detection threshold values are adjusted for wide voltage ranges, then adaptability is improved, but device complexity increases due to required threshold changes
Solution Approach 1:
The patent creates a universal fault detection method that works across wide voltage ranges by using power consumption calculations rather than fixed voltage thresholds. The same calculation-based approach adapts automatically to different voltage conditions, eliminating the need for multiple threshold settings while maintaining detection accuracy across the full operating range
Solution Approach 2:
The patent changes the fundamental parameter used for fault detection from fixed voltage thresholds to dynamic power consumption calculations. This parameter transformation allows the system to adapt to varying voltage conditions through computation rather than requiring manual threshold adjustments, simplifying the overall system while expanding adaptability
Data Source
AI summary
An abnormality diagnosis apparatus includes a power consumption estimation section that estimates power consumption of a motor, which is driven by power supplied from a power supply, and power consumption of an auxiliary unit using the power to calculate a power consumption estimate value, a power-supply voltage estimation section that calculates a power-supply voltage estimate value, which is an estimate value of voltage of the power supply, based on the power consumption estimate value and a power-supply current detection value, which is based on a detection value of a power-supply current sensor detecting a current of the power supply, and an abnormality determination section that determines an abnormality of a power-supply voltage sensor detecting a voltage of the power supply, based on a comparison result between the power-supply voltage estimate value and a power-supply voltage detection value, which is based on a detection value of the power-supply voltage sensor.