Patent ID: 7481919
Filing Date: 2009-01-27
Classification: F02M

Abstract:
1. A multiple filter controller for monitoring two or more filters to detect when any one of the filters is malfunctioning, wherein the two or more filters filter a fluid supplied to an engine, and further wherein the multiple filter controller allows for the replacement of the malfunctioning filter while the engine is running, wherein the multiple filter controller comprises: an inlet pipe, which introduces the fluid into the multiple filter controller; a first filter; a second filter; an inlet valve; an outlet valve; a boost pump located downstream of the outlet valve, wherein the boost pump moves the fluid through the multiple filter controller; a vacuum switch located downstream of the boost pump and upstream of a pump associated with said engine, wherein the vacuum switch detects a pressure level above a predetermined pressure level, wherein the pressure level is caused by a flow of the fluid through the malfunctioning filter, and wherein the vacuum switch responds to the pressure level, upon which response, the inlet valve is positioned to restrict the flow of the fluid from the inlet pipe to the malfunctioning filter and to permit the flow of the fluid from the inlet pipe to the other of said filters, and further wherein, upon the response of the vacuum switch, the outlet valve is positioned to restrict the flow of the fluid from the malfunctioning filter and to permit the flow of the fluid from the other of said filters; a check valve in operable communication with the boost pump, wherein the check valve prevents a backflow of the fluid to an inlet of the boost pump; and a bleed valve located downstream of the vacuum switch, wherein the bleed valve, in combination with the boost pump, removes excess air from the multiple filter controller.