METHOD FOR DETERMINING DEGREE OF CONTAMINATION AND QUALITY OF SPRAYING FUEL OF ELECTROMAGNETIC NOZZLES Russian patent published in 2019 - IPC F02M65/00 

FIELD: test technology.

SUBSTANCE: invention relates to diagnostics and testing of electromagnetic nozzles. Disclosed is a method for testing electromagnetic nozzles, consisting in continuous measurement of angular speed and acceleration of crankshaft in idling mode with closed throttle valve, with temporary shunting of primary winding of ignition coil for period of time of energy accumulation and supply of spark into selected cylinder. According to the method, the duration of the injection signal of the injector from the value set by the electronic engine control unit is forcibly smoothly increased, at that, if the angular acceleration value of the crankshaft on the compression strokes decreases in proportion to the increase in the duration of the injection signal, this indicates that the fuel during spraying is sufficiently well sprayed and evaporated and the nozzle operates normally, if value of angular acceleration of crankshaft decreases insignificantly with increase of duration of injection signal, then it indicates that nozzle has under reduced carrying capacity. Also, at working movement stroke of diagnosed cylinder, with constant measurement of air mass flow rate in engine, forcibly increases and measures duration of injector injection signal from set value of engine electronic control unit to maximum value of acceleration of crankshaft, based on obtained values of duration of control signal injector, at known value of excess air coefficient, efficiency of selected nozzle and degree of its contamination are calculated.

EFFECT: simplification, reduction of labor intensity and increase of diagnostics accuracy at determination of degree of contamination of electromagnetic nozzles without removal from engine.

1 cl, 3 dwg