Method and apparatus for monitoring solenoid health

Details Method and apparatus for monitoring solenoid health Method and apparatus for monitoring solenoid health

2009-02-20

2011-11-08

Wachsman, Hal (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C702S063000, C702S064000, C702S065000, C324S415000, C324S418000

Reexamination Certificate

active

08055460

ABSTRACT:
A method for monitoring the state of health (SOH) of a solenoid powered by a battery includes measuring a voltage and a current supplied to the solenoid by the battery, using a processor to determine each of an equivalent resistance and inductance of the solenoid using the voltage and the current, comparing the equivalent resistance and the equivalent inductance to a corresponding calibrated threshold, and recording deviations from the corresponding calibrated thresholds as a pair of SOH values. A trend of the SOH values is continuously monitored, and an appropriate control action is taken when either SOH value drops below a calibrated lower limit. A solenoid monitoring system includes a solenoid, voltage and current sensors, and a controller having an algorithm for continuously monitoring a state of health (SOH) of the solenoid as set forth above.

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Chyuan-Yow Tseng and Chiu-Feng Lin, A Simple Method for Automotive Switching-type Solenoid Valve Stuck Fault Detection, Int. J. Heavy Vehicle Systems, vol. 14, No. 1, 2007.

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