Temperature Sensor Failure Diagnosis in Switch Devices

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Inverter systems face challenges in accurately diagnosing temperature sensor failures in switch devices, leading to potential system shutdowns and damage, especially when abnormal temperature sensing occurs due to issues like connector disconnection or short circuits, without additional temperature or flow sensors for cooling water.

Innovation Solution

A failure diagnosis method and system that sets a sampling period based on temperature detected by the temperature sensor and cooling water temperature, comparing the sensed values with a reference value to determine sensor failure, using an equation to calculate the temperature reference value and storing failure data for analysis, without requiring additional sensors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If additional temperature or flow sensors are installed for cooling water to diagnose temperature sensor failures, then measurement precision is improved, but device complexity and cost increase

Engineering Contradiction:

Improvetemperature sensor failure diagnosis accuracyVSAvoidsensor quantity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system uses the temperature sensor's own readings combined with cooling water temperature data and thermal models to diagnose its own failure status, eliminating the need for additional dedicated diagnostic sensors

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Cooling water temperature serves as an intermediary parameter to indirectly assess the temperature sensor's health status by comparing expected versus actual temperature relationships

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If additional temperature or flow sensors are installed for cooling water to diagnose temperature sensor failures, then measurement precision is improved, but manufacturing cost increases

Engineering Contradiction:

Improvetemperature sensor failure diagnosis accuracyVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The diagnostic system uses existing sensors and computational models to perform self-diagnosis, eliminating the need for additional expensive diagnostic hardware

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system creates a virtual model of the thermal system using equations and existing sensor data to simulate expected temperature behavior, comparing it with actual readings to detect failures without physical additional sensors

Inventive Principle:

Principle #26Copying

3Device complexity

If the temperature sensor fails to detect abnormal temperature due to connector disconnection or short circuit, then device complexity remains low, but reliability deteriorates

Engineering Contradiction:

Improvesensor system structureVSAvoidtemperature sensing reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The system continuously monitors temperature readings against expected thermal behavior models and provides feedback to detect when the sensor fails, allowing for real-time reliability assessment without changing the sensor hardware

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary diagnostic checks by comparing temperature readings with cooling water temperature and thermal models to detect potential sensor failures before they cause system damage

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10209145B2Failure diagnosis method and system of temperature sensor of switch device

Publication Date: 2019.02.19 HYUNDAI MOTOR CO LTD

AI summary

A failure diagnosis method of a temperature sensor of a switch device is provided. The method includes setting a sampling period using a temperature detected by the temperature sensor of the switch device and a temperature of cooling water for cooling the switch device. A temperature sensing value detected by the temperature sensor is then compared with a temperature reference value stored in a memory in the sampling period to determine whether failure occurs in the temperature sensor.