Solenoid valve abnormality detection device, automatic medical analysis apparatus using same, and solenoid valve abnormality detection method

A solenoid valve abnormality detection method for detecting an abnormality of a solenoid valve in an automatic medical analysis apparatus including a liquid feeding unit which includes a flow path and the solenoid valve disposed in the flow path, the solenoid valve abnormality detection method comprising:

• obtaining feature data of a driving current pattern associated with solenoid valve opening of the solenoid valve in a predetermined detection period;
• estimating a solenoid valve temperature of the solenoid valve based on a saturation current value of the solenoid valve, and correcting a value of the feature data to a value at a reference temperature that is based on the estimated solenoid valve temperature;
• estimating an opening state of the solenoid valve using an estimation model configured to estimate the opening state of the solenoid valve based on the feature data of the driving current pattern associated with the solenoid valve opening of the solenoid valve and the value of the feature data corrected to the value at the reference temperature;
• and
• outputting an alarm signal when an abnormality is determined based on the estimated solenoid valve temperature of the solenoid valve or the opening state of the solenoid valve.

A solenoid valve abnormality detection method for detecting an abnormality of a solenoid valve in an automatic medical analysis apparatus including a liquid feeding unit which includes a flow path and the solenoid valve disposed in the flow path, the solenoid valve abnormality detection method comprising:

• obtaining feature data of a driving current pattern associated with solenoid valve opening of the solenoid valve in a predetermined detection period;
• extracting a current value at a predetermined elapsed time in the detection period as one piece of the feature data of the driving current pattern associated with the solenoid valve opening of the solenoid valve;
• estimating a solenoid valve temperature of the solenoid valve based on a saturation current value of the solenoid valve, and correcting a value of the feature data to a value at a reference temperature that is based on the estimated solenoid valve temperature;
• estimating a flow path internal pressure of the flow path in which the solenoid valve is disposed based on the current value at the predetermined elapsed time which is corrected to the value at the reference temperature, and correcting the value of the feature data corrected to the value at the reference temperature to a value at a reference pressure that is based on the estimated flow path internal pressure;
• estimating an opening state of the solenoid valve using an estimation model configured to estimate the opening state of the solenoid valve based on the feature data of the driving current pattern associated with the solenoid valve opening of the solenoid valve and the value of the feature data corrected to the value at the reference temperature and the reference pressure;
• and
• outputting an alarm signal when an abnormality is determined based on the estimated solenoid valve temperature of the solenoid valve, the estimated flow path internal pressure, or the estimated opening state of the solenoid valve.