Abstract: An automotive fluid control system with pressure balanced solenoid valve [24] and fluid mixing housing [22] is disclosed. The solenoid valve [24] is preferably used in an EGR (exhaust gas circulation) fluid control system, although the valve may be used in other vehicle fluid control systems, such as an engine block cooling liquid control system. A poppet member [84] of an EGR valve is pressured balanced such that only a light spring [170] and armature [88] are needed to control the positioning of the poppet member [84]. Magnetic and inductance sensors [184, 282] are used to accurately determine the position of the poppet member. The fluid mixing housing [22] homogeneously mixes first and second fluids. A portion of a main first fluid flow is funneled off and mixed in the housing [22] with a second fluid prior to being returned to the main fluid flow.

Abstract: A composite check valve and positively closing electromagnetic solenoid valve, particularly such a valve for regulating the introduction of secondary air into the exhaust stream of an internal combustion engine at selected times during the operation of the engine. The valve comprises an inlet port, an outlet port, a first valve element movable between open and closed positions for nominally regulating the flow of a fluid between the inlet and outlet ports, and an electromagnetic solenoid having a closure element for overriding the first element. The rigid disk or closure element can function by seating against the same seat as the first element, or by "latching" the first element in its closed position. The disclosed embodiment is a flap valve which is modified by superimposing a rigid, movable valve disk over the flap. The rigid disk is connected to the solenoid armature and is movable between an override (closed) position and a disengaged (open) position when the solenoid is energized.