Vehicle exhaust gas recirculation system utilizing a low temperature circuit-high temperature circuit crossover valve assembly

A crossover (X) valve assembly for a vehicle exhaust gas recirculation (EGR) system, the X valve assembly comprising:

• a valve housing;
• a low temperature (LT) inlet port fluidly coupled to the housing;
• a LT outlet port fluidly coupled to the housing, the LT inlet port and the LT outlet port forming a portion of a LT circuit adapted to circulate a relatively lower temperature fluid within the EGR system;
• a high temperature (HT) inlet port fluidly coupled to the housing;
• a HT outlet port fluidly coupled to the housing, the HT inlet port and the HT outlet port forming a portion of a HT circuit adapted to circulate a relatively higher temperature fluid within the EGR system;
• an inner wall disposed within the valve housing adapted to be actuated from an inactive configuration in which the LT inlet port is fluidly coupled to the LT outlet port through a LT chamber defined within the valve housing and the HT inlet port is fluidly coupled to the HT outlet port through a HT chamber defined within the valve housing and an active configuration in which the HT inlet port is fluidly coupled to the LT outlet port through a first mixing chamber defined within the valve housing and the LT inlet port is fluidly coupled to the HT outlet port through a second mixing chamber defined within the valve housing;
• and
• a HT bypass mechanism disposed adjacent to the valve housing or through the inner wall and adapted to bypass a portion of the relatively higher temperature fluid of the HT circuit around or through the valve housing from the HT inlet port to the HT outlet port.

A computer program product including a non-transitory computer readable medium having instructions stored thereon and executed to cause a computer to:

• obtain an operating state of a vehicle;
• and
• based on the obtained operating state of the vehicle, selectively actuate a valve assembly fluidly coupled to a high temperature (HT) circuit adapted to circulate a relatively higher temperature fluid within an exhaust gas recirculation (EGR) system and a low temperature (LT) circuit adapted to circulate a relatively lower temperature fluid within the EGR system, actuating the valve assembly causing all or a portion of the relatively higher temperature fluid of the HT circuit to mix with the relatively lower temperature fluid of the LT circuit;
• wherein the valve assembly comprises a crossover (X) valve assembly fluidly coupled to both the HT circuit and the LT circuit, wherein the X valve assembly comprises a valve housing encompassing an inner wall adapted to rotationally define, in an inactive configuration, a LT chamber fluidly coupling a LT inlet port to a LT outlet port of the valve housing and a HT chamber fluidly coupling a HT inlet port to a HT outlet port of the valve housing, and, in an active configuration, a first mixing chamber fluidly coupling the HT inlet port to the LT outlet port of the valve housing and a second mixing chamber fluidly coupling the LT inlet port to the HT outlet port of the valve housing, and wherein the X valve assembly comprises a HT bypass mechanism adapted to bypass a portion of the relatively higher temperature fluid of the HT circuit around or through the X valve assembly from the HT inlet port to the HT outlet port of the valve housing.