Patent ID: 8444748

Claim:
A method of operating an engine air intake filter assembly having a pulse jet cleaning arrangement constructed and arranged to selectively direct pulses of air through an air filter arrangement; the method comprising: (a) measuring time of operation since a previous pulse valve arrangement operation; and, if a preselected period of time has occurred: actuating a pulse jet cleaning system; and, activating a pulse valve arrangement, if the accumulator tank pressure is at least a predetermined accumulator pressure, to direct one or more pulses of air, in a reverse direction, through the air filter arrangement; and, also, (b) evaluating a pressure drop across the air filter arrangement; and, if the pressure drop across the air filter arrangement exceeds a predetermined pressure drop: actuating the pulse jet cleaning system; and, activating the pulse valve arrangement, if accumulator tank pressure is at least a predetermined accumulator pressure, to direct one or more pulses of air, in a reverse direction, through the air filter arrangement, if it has been determined that the engine rpm is no greater than a selected value.