METHOD AND SYSTEM FOR DIAGNOSE OF A SOLENOID VALVE

摘要

Disclosed is a method for diagnosis of a solenoid valve, wherein said solenoid valve comprises a solenoid and a moveable valve element, wherein said moveable valve element is moveable between a first state and a second state, wherein the movement from said first state to said second state is achieved through supply of current to said solenoid. The method comprises: to, at a first time, where the current through said solenoid is increasing, determine a first derivative for said current, to, at a second time, following said first time, and where the current through said solenoid is increasing, determine a second derivative for said current, and to, based on a comparison between said first derivative and said second derivative, diagnose said solenoid valve.

主权项

1. A method for diagnosis of a solenoid valve, wherein said solenoid valve comprises a solenoid and a moveable valve element, wherein said moveable valve element is moveable between a first state and a second state, wherein movement from said first state to said second state is achieved by supply of current to said solenoid, wherein the method comprises:
at a first time (T1), before the movement from said first state to said second state, when a current through said solenoid is increasing, to determine a first derivative(T1t)for said current,
at a second time (T2), following said first time, and when the current through said solenoid is increasing, to determine a second derivative(T2t)for said current, and
based on a comparison between said first derivative(T1t)and said second derivative(T2t),to diagnose said solenoid valve.