Electromagnetic Valve Controller Cutoff Circuit Diagnosis
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Solution Overview
Problem
Existing electromagnetic valve driving circuits face challenges in diagnosing whether the cutoff circuit can effectively disconnect the power supply from the switching element, leading to potential abnormal operations.
Innovation Solution
A controller with a switching element, a cutoff circuit, and current detecting means that outputs cutoff and switching commands to diagnose normal operation by comparing solenoid current with a threshold value, ensuring the cutoff circuit functions correctly and preventing engagement when it doesn't.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the cutoff circuit fails to disconnect properly, then current continues to flow through the solenoid, but there is no means to detect this abnormality
Solution Approach 1:
The patent employs feedback through current detecting means that continuously monitors solenoid current. When the cutoff circuit fails to disconnect, the detected current value remains above the threshold, providing continuous feedback to the controller about the abnormal state, thereby enabling detection of the cutoff failure that would otherwise be invisible.
Solution Approach 2:
The patent replaces direct mechanical or electrical inspection of cutoff circuit status with an electrical measurement approach. Instead of checking whether the cutoff circuit is physically disconnected, the system uses current detecting means to measure the solenoid current and infer cutoff status from the current value, substituting a complex status check with a simple current measurement.
Data Source
AI summary
A controller of an electromagnetic valve driving circuit include a switching element connected to an electromagnetic valve solenoid, a cutoff circuit for cutting off a connection between a power supply and the switching element, and a current detecting unit for detecting a current flowing in the solenoid. The controller includes an abnormality diagnosing unit for outputting a cutoff command to the cutoff circuit for cutting off the connection between the power supply and the switching element, and outputting a switching command causing the switching element to perform a switching operation when a predetermined diagnosis condition is satisfied, and determining that the cutoff circuit normally operates when the solenoid current is less than a threshold value and determining that the cutoff circuit operates abnormally when the solenoid current is greater than or equal to the threshold value while outputting the cutoff command and the switching command.