Determination diagnosis device

The device accurately determines leakage current and diagnoses detection unit health by using threshold comparisons during diagnostic control, addressing the failure of existing devices to diagnose detection unit states accurately.

JP2026002462APending Publication Date: 2026-01-08TOYOTA JIDOSHA KK
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Patent Information

Application Number
JP2024100472
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-06-21
Publication Date
2026-01-08

AI Technical Summary

Technical Problem

Existing devices fail to accurately diagnose the state of the detection unit for leakage current, making it impossible to determine if a leakage current is occurring during the diagnosis process.

Method used

A determination and diagnosis device that determines the presence of a leakage current by using a detection unit to measure a parameter reflecting current flow, and diagnoses the detection unit's state by comparing detection values to first and second threshold values during diagnostic control, which involves connecting and disconnecting the electrical circuit via resistors to account for stray capacitance discharge.

Benefits of technology

Enables accurate determination of leakage current occurrence and diagnosis of detection unit abnormalities by monitoring detection values against varying threshold values, ensuring precise diagnosis during diagnostic control.

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Abstract

To diagnose a detection part while determining whether or not a leakage current is generated.SOLUTION: A determination diagnosis device that determines whether or not a leakage current has occurred based on a detection value from a detection unit that detects a current flowing between an electric circuit and a predetermined location, and diagnoses a state of the detection unit, the determination diagnosis device comprising: And a determination diagnosis unit configured to determine whether or not a leakage current has occurred based on the detection value and a first threshold value, and to diagnose a state of the detection unit based on the detection value, the first threshold value, and a second threshold value different from the first threshold value while performing diagnosis control for controlling the connection release unit such that the electric path and the predetermined point are connected to each other.SELECTED DRAWING: Figure 2
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