Patent ID: 9644528
Date: 2017-05-09
CPC Classifications: F02B,F02M,Y02T

Claim:
1. An engine system for an engine having at least a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder, the engine system comprising: a first exhaust manifold fluidly connected to the first cylinder; a second exhaust manifold fluidly connected to the second cylinder; a third exhaust manifold fluidly connected to the third cylinder; a fourth exhaust manifold fluidly connected to the fourth cylinder, the fourth exhaust manifold being distinct from the third exhaust manifold; a recirculation passage extending from the first exhaust manifold to at least one of the first and second cylinders; a recirculation control valve disposed in the recirculation passage; a first restricted orifice connecting the first exhaust manifold to the second exhaust manifold; a second restricted orifice connecting the third exhaust manifold to the fourth exhaust manifold; a first pressure relief passage extending from the first exhaust manifold; a second pressure relief passage extending from the third exhaust manifold; a first valve disposed within the first pressure relief passage and movable to selectively reduce a back pressure of the first exhaust manifold, the first valve being a relief control valve configured to move between a flow-passing position and a flow-blocking position; a second valve disposed within the second pressure relief passage and movable to selectively reduce a back pressure of the third exhaust manifold; and a controller in communication with the relief control valve and the recirculation control valve, the controller being configured to effect an opening motion of the relief control valve automatically based on a closing motion of the recirculation control valve and simultaneously with the closing motion of the recirculation control valve.