Current Cutoff Device Diagnosis Without Power Interruption
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Solution Overview
Problem
Existing methods for diagnosing current cutoff devices in parallel connection on vehicles fail to prevent electrical power cutoff during vehicle travel, as they require temporary power interruption for diagnosis.
Innovation Solution
A diagnosis device that switches one current cutoff device between open and closed states while the engine is stopped, detecting end-to-end voltage when a current threshold is met, allowing for accurate diagnosis without interrupting power supply during vehicle travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current cutoff device is opened for diagnosis while vehicle is traveling, then failure diagnosis can be performed, but electrical power supply is cut off during vehicle travel
Solution Approach 1:
The system determines whether the vehicle is in a traveling state before performing diagnosis. If the vehicle is traveling, the diagnosis is postponed or cancelled to prevent power cutoff. This preliminary check ensures that diagnosis operations are only performed when safe, preventing the harmful effect of power cutoff during travel while maintaining diagnosis capability when parked.
Solution Approach 2:
The control unit acts as an intermediary that coordinates between the diagnosis function and power supply continuity requirements. It monitors vehicle state and selectively enables or disables diagnosis operations based on whether the vehicle is traveling, thus mediating between the need for accurate diagnosis and the need to maintain continuous power supply.
2Reliability
If two current cutoff devices are connected in parallel for continuous power supply, then power supply continuity is maintained, but diagnosis requires opening one device which may cause power cutoff if the other fails
Solution Approach 1:
The system checks the vehicle traveling state before attempting diagnosis of either current cutoff device. This preliminary verification ensures that diagnosis is only performed when the vehicle is parked, eliminating the risk of power cutoff during travel while maintaining the ability to diagnose both devices in the parallel configuration.
Solution Approach 2:
The control unit continuously monitors the operating states of both current cutoff devices and the vehicle traveling state. Based on this feedback, it dynamically determines whether to perform diagnosis, switch operations, or maintain normal operation, thus coordinating diagnosis activities with system safety requirements.
3Measurement precision
If current cutoff device is switched during vehicle travel for diagnosis, then failure can be detected, but system stability is compromised due to potential power cutoff
Solution Approach 1:
The control unit determines vehicle traveling state before executing any switch operation on current cutoff devices. By performing this preliminary check, it ensures that switching operations are only conducted when the vehicle is parked, thereby maintaining system stability during travel while enabling accurate failure detection when safe.
Solution Approach 2:
The system takes preliminary action to prevent potential harm by checking the traveling state before diagnosis. This preliminary anti-action blocks diagnosis operations when the vehicle is traveling, preventing the harmful effect of power cutoff and maintaining system stability, while allowing diagnosis when parked.
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 reliable diagnosis of current cutoff devices without power cutoff, ensuring continuous electrical supply and meeting functional safety standards by performing switch processing during engine stoppage and detecting voltage changes at peak current times.
Implementation Method 1
The diagnosis device detects end-to-end voltage of the current cutoff device when current larger than a threshold flows through the current cutoff device
Data Source
AI summary
A diagnosis device diagnoses current cutoff devices connected in parallel and disposed on an energization path to an energy storage device mounted on a vehicle. The diagnosis device performs switch processing of switching one of the current cutoff devices to be diagnosed from an opened state to a closed state or from the closed state to the opened state and closing the other current cutoff device while an engine of the vehicle is stopped. The diagnosis device detects end-to-end voltage of the current cutoff device when current larger than a threshold flows through the current cutoff device after the switch processing, and diagnoses the current cutoff device based on the detected end-to-end voltage.