초록 ▼

An exhaust system for a use with a combustion engine is provided. The exhaust system may have a first exhaust manifold, a second exhaust manifold, and an exhaust gas recirculation circuit. The exhaust system may also have a fixed geometry turbocharger with a first volute configured to receive exhaus

An exhaust system for a use with a combustion engine is provided. The exhaust system may have a first exhaust manifold, a second exhaust manifold, and an exhaust gas recirculation circuit. The exhaust system may also have a fixed geometry turbocharger with a first volute configured to receive exhaust from the first exhaust manifold, and a second volute configured to receive exhaust from the second exhaust manifold. The exhaust system may also have a recirculation control valve in fluid communication with the first exhaust manifold, the second exhaust manifold and the exhaust gas recirculation circuit. The recirculation control valve may have a valve element movable to selectively adjust a flow of exhaust in the exhaust gas recirculation circuit, the first volute, and the second volute.

대표청구항 ▼

1. An exhaust system for an engine, comprising:a first exhaust manifold configured to receive exhaust from the engine;a second exhaust manifold configured to receive exhaust from the engine in parallel with the first exhaust manifold;an exhaust gas recirculation circuit;a fixed geometry turbocharger

1. An exhaust system for an engine, comprising:a first exhaust manifold configured to receive exhaust from the engine;a second exhaust manifold configured to receive exhaust from the engine in parallel with the first exhaust manifold;an exhaust gas recirculation circuit;a fixed geometry turbocharger having a first volute configured to receive exhaust from the first exhaust manifold, and a second volute configured to receive exhaust from the second exhaust manifold; anda recirculation control valve in fluid communication with the first exhaust manifold, the second exhaust manifold, and the exhaust gas recirculation circuit, the recirculation control valve having a valve element movable to selectively adjust a flow of exhaust in the first and second volute, while directing an additional flow from the recirculation control valve to the exhaust gas recirculation circuit, the valve element having a closed position blocking the additional flow from passing to the exhaust gas recirculation circuit. 2. The exhaust system of claim 1, wherein the valve element is movable to selectively allow exhaust entering the recirculation control valve from the first exhaust manifold to pass to only the exhaust gas recirculation circuit, to allow exhaust entering the recirculation control valve from the first exhaust manifold to pass to both the exhaust gas recirculation circuit and the second exhaust manifold, or to allow exhaust entering the recirculation control valve from the first exhaust manifold to pass to only the second exhaust manifold. 3. The exhaust system of claim 1, wherein the recirculation control valve is a proportional control valve and the valve element is selectively movable to adjust a flow restriction on exhaust passing through the second exhaust manifold and the exhaust gas recirculation circuit simultaneously. 4. The exhaust system of claim 3, wherein a flow restriction adjustment affects a flow rate of exhaust passing to the exhaust gas recirculation circuit. 5. The exhaust system of claim 1, wherein the valve element is a normally closed element biased to allow exhaust from the first exhaust manifold to pass to only the exhaust gas recirculation circuit. 6. The exhaust system of claim 5, wherein a greater opening of the valve element results in less exhaust passing through the exhaust gas recirculation circuit. 7. The exhaust system of claim 1, wherein exhaust from the first exhaust manifold passing through the recirculation control valve mixes with exhaust from the second exhaust manifold before passing through the turbocharger. 8. The exhaust system of claim 1, wherein the recirculation control valve is separate from the turbocharger. 9. The exhaust system of claim 1, wherein the first volute has a greater restriction than the second volute to drive exhaust flow through the exhaust gas recirculation circuit. 10. The exhaust system of claim 1, further including a cooler located within the exhaust gas recirculation circuit downstream of the recirculation control valve. 11. The exhaust system of claim 10, further including a flow sensor located within the exhaust gas recirculation circuit downstream of the cooler. 12. The exhaust system of claim 10, further including a check valve located within the exhaust gas recirculation circuit downstream of the cooler at a location where exhaust mixes with ambient air. 13. The exhaust system of claim 1, the valve element having an open position, wherein moving the valve element from the open position toward the closed position simultaneously increases a flow of exhaust from the first exhaust manifold to the second exhaust manifold and decreases a flow of the additional flow passing to the exhaust gas recirculation circuit. 14. A method for controlling the pressure of exhaust gas in a recirculation circuit, comprising: receiving exhaust from a first plurality of combustion chambers and from a second plurality of combustion chambers;directing exhaust received from the first plurality of combustion chambers, through a valve, to the recirculation circuit;directing exhaust received from the first plurality of combustion chambers through a first portion of a turbocharger to simultaneously increase an exhaust pressure of the recirculation circuit, increase a pressure of exhaust directed to the first portion, and decrease a pressure of exhaust directed to a second portion of the turbocharger;selectively directing exhaust received from the first plurality of combustion chambers through the valve to mix with exhaust received from the second plurality of combustion chambers, form a mixed exhaust, and adjust the exhaust pressure of the recirculation circuit; anddirecting the mixed exhaust through the turbocharger without passing the mixed exhaust through the recirculation circuit. 15. The method of claim 14, further including selectively adjusting an amount of exhaust directed through the recirculation circuit by changing a restriction on the exhaust directed to mix with exhaust received from the second plurality of combustion chambers. 16. The method of claim 15, wherein the restriction is infinitely changeable. 17. The method of claim 16, further including: sensing the amount of exhaust directed through the recirculation circuit; andchanging the restriction based on the sensed amount. 18. The method of claim 15, wherein an increase in the restriction results in an increase in the amount of exhaust directed through the recirculation circuit. 19. The method of claim 14, wherein the pressure increase caused by exhaust received from the first plurality of combustion chambers being directed through the turbocharger drives exhaust through the recirculation circuit. 20. The method of claim 14, further including cooling the exhaust directed through the recirculation circuit. 21. The method of claim 14, wherein the first portion of the turbocharger receives exhaust from the first plurality of combustion chambers via a direct fluid connection extending from a first manifold fluidly connected to the first plurality of combustion chambers to the first portion, and wherein the mixed exhaust is directed through the second portion of the turbocharger. 22. The method of claim 14, further including increasing a pressure of the mixed exhaust with the valve while simultaneously decreasing the exhaust pressure of the recirculation circuit with the valve. 23. A power system, comprising: a combustion engine having a first plurality of combustion chambers and a second plurality of combustion chambers;a first exhaust manifold configured to receive exhaust from the first plurality of combustion chambers;a second exhaust manifold configured to receive exhaust from the second plurality of combustion chambers in parallel with the first exhaust manifold;an exhaust gas recirculation circuit;a fixed geometry turbocharger having a first volute configured to receive exhaust from the first exhaust manifold, and a second volute configured to receive exhaust from the second exhaust manifold;a proportional recirculation control valve in fluid communication with the first exhaust manifold, the second exhaust manifold, and the exhaust gas recirculation circuit, the proportional recirculation control valve having a single inlet, and a valve element movable to selectively adjust a flow of exhaust in the exhaust gas recirculation circuit, the first volute, and the second volute; anda cooler located within the exhaust gas recirculation circuit downstream of the proportional recirculation control valve. 24. The power system of claim 23, further including a passage directing exhaust from the first exhaust manifold to the first volute without passing through the proportional recirculation control valve.