Diagnosis method for solenoid valve based on noise detection

Details Diagnosis method for solenoid valve based on noise detection Diagnosis method for solenoid valve based on noise detection

2011-01-25

2011-01-25

Cronin, Stephen K (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S506000, C073S114380, C702S185000

Reexamination Certificate

active

07877194

ABSTRACT:
A solenoid valve includes cyclically energizing and deenergizing a solenoid of the solenoid valve to repeatedly fully open and fully close the solenoid valve. When the energizing and deenergizing causes collisions of a moving member of the solenoid valve against at least one of a first and a second seat formed in a housing of the solenoid valve, noises are thus generated by the collisions and occurrence intervals of the noises are detected. Whether the solenoid valve is in normal or abnormal condition is diagnosed based on the detected occurrence intervals of the noises.

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