Systems and methods for exhaust gas recirculation

摘要

An engine system includes a first cylinder group, a second cylinder group, an inlet manifold coupled to the first cylinder group and the second cylinder group, an inlet passage coupled to the inlet manifold to provide inlet air to the inlet manifold, a first exhaust manifold coupled to the first cylinder group, a second exhaust manifold coupled to the second cylinder group, and a mixer pipe positioned within the second exhaust manifold and/or the intake passage to mix exhaust gas recirculation (EGR) gases exhausted by the second cylinder group that are delivered through the second exhaust manifold with inlet air. The mixer pipe forms an inlet end that is coupled to the second exhaust manifold and an outlet end that is located upstream of the cylinders in the first cylinder group and the cylinders in the second cylinder group.

主权项

1. An engine system comprising:
a v-engine having a first cylinder group including at least two cylinders and a second cylinder group including at least two cylinders, the first and second cylinder groups having a firing order that produces unequally spaced and un-periodic pulses of exhaust gas recirculation (EGR) from the second cylinder group, where a first portion of cylinders of the first cylinder group are included in a first bank of the v-engine, a second portion of cylinders of the first cylinder group are included in a second bank of the v-engine, and all cylinders of the second cylinder group are included in the second bank; an inlet manifold coupled to the first cylinder group and the second cylinder group; an inlet passage coupled to the inlet manifold to provide inlet air to the inlet manifold; a first exhaust manifold coupled to the first cylinder group; a second exhaust manifold coupled to the second cylinder group; and a mixer pipe positioned within the second exhaust manifold and/or the inlet passage to mix EGR gases exhausted by the second cylinder group that are delivered through the second exhaust manifold with inlet air, the mixer pipe forming an inlet end coupled to the second exhaust manifold and an outlet end that is located upstream of the at least two cylinders in the first cylinder group and the at least two cylinders in the second cylinder group.