Exhaust system having parallel asymmetric turbochargers and EGR
AssigneeCaterpillar Inc.
InventorsJohn R. Gladden, David Andrew Pierpont, John P. Timmons
Life of this patent
Estimating the term…
Abstract
An exhaust system for a use with a combustion engine is provided. The exhaust system may have a first exhaust manifold configured to receive exhaust from the engine, and a first turbocharger driven by exhaust from the first exhaust manifold. The exhaust system may also have a second exhaust manifold configured to receive exhaust from the engine in parallel with the first exhaust manifold, and a second turbocharger driven by exhaust from the second exhaust manifold and having a different flow capacity than the first turbocharger. The exhaust system may further have an exhaust gas recirculation circuit in fluid communication with the second exhaust manifold.
Claims19
An exhaust system for an engine, comprising:
- a first exhaust manifold configured to receive exhaust from the engine;
- a first turbocharger driven by exhaust from the first exhaust manifold;
- a second exhaust manifold configured to receive exhaust from the engine in parallel with the first exhaust manifold;
- a second turbocharger driven by exhaust from the second exhaust manifold and having a different flow capacity than the first turbocharger;
- a balancing valve upstream of the first and second turbochargers;
- and
- an exhaust gas recirculation circuit initiating upstream of the balancing valve from only a single exhaust line, the single exhaust line extending from the second exhaust manifold.
A method of handling exhaust from an engine, comprising:
- receiving exhaust from a first plurality of combustion chambers;
- removing energy from exhaust received from the first plurality of combustion chambers;
- receiving exhaust from a second plurality of combustion chambers;
- directing a portion of the exhaust received from the second plurality of combustion chambers through an EGR circuit back into the engine for subsequent combustion;
- the EGR circuit initiating upstream of a balance valve from only a single exhaust line, the single exhaust line extending from the second plurality of combustion chambers;
- removing energy from a remaining portion of the exhaust received from the second plurality of combustion chambers in parallel with removing energy from the exhaust received from the first plurality of combustion chambers,
- wherein removing energy from the remaining portion of the exhaust increases a pressure of the exhaust received from the second plurality of combustion chambers by an amount greater than a pressure increase of the exhaust received from the first plurality of combustion chambers caused by removing energy;
- sensing a flow rate of the portion of the exhaust directed back into the engine;
- and
- adjusting a restriction placed on a flow of the exhaust received from the second plurality of combustion chambers based on the sensed flow rate.
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 combustion engine;
- a first turbocharger driven by exhaust from the first exhaust manifold;
- a second exhaust manifold configured to receive exhaust from the combustion engine in parallel with the first exhaust manifold;
- a second turbocharger driven by exhaust from the second exhaust manifold and having a lower flow capacity than the first turbocharger;
- an exhaust gas recirculation circuit in fluid communication with the second exhaust manifold;
- a passageway connecting the first and second exhaust manifolds;
- a balancing valve located within the passageway to selectively restrict a flow of exhaust through the passageway;
- and
- a control valve located within the exhaust gas recirculation circuit to regulate a flow of exhaust directed through the exhaust gas recirculation circuit.
Dependencies are inferred from the claim text.