DIAGNOSTIC CIRCUIT OF A FLUID INJECTOR AND METHOD FOR DIAGNOSING A FAULT

摘要

A diagnostic circuit arranged to measure an electrical characteristic (334, 430) in a drive circuit (300) of a coil (110) of a fluid injector and compare the measured electrical characteristic with another electrical characteristic to determine whether a PN junction (130) is working to discharge electrical energy in the coil (110) of the fluid injector, in particular a selective catalytic reduction dosing injector.