Exhaust system having turbo-assisted high-pressure EGR
AssigneeCaterpillar Inc.
InventorsJohn Ray Gladden, Paul Raymond Mineart, Jr.
Life of this patent
Estimating the term…
Abstract
An exhaust system for a use with an engine is provided. The exhaust system may have an exhaust manifold configured to direct exhaust from the engine, and a main turbocharger connected to receive exhaust from the exhaust manifold. The exhaust system may also have a recirculation turbocharger having a compressor connected to receive exhaust from the exhaust manifold in parallel with the main turbocharger, and a turbine connected to receive exhaust from the main turbocharger to drive the compressor. The exhaust system may further have a control valve located downstream of the recirculation turbocharger to regulate exhaust flow through the compressor.
Claims20
A method of managing exhaust from an engine, comprising:
- directing an exhaust flow in parallel from the engine to a first turbocharger and to a second turbocharger;
- directing the exhaust flow from the first turbocharger to the second turbocharger;
- directing the exhaust flow from a compressor of the second turbocharger to the engine;
- and
- selectively restricting the exhaust flow exiting a turbine of the second turbocharger to regulate the exhaust flow to the engine from the compressor.
An exhaust system for an engine, comprising:
- an exhaust manifold configured to direct an exhaust flow from the engine;
- a main turbocharger connected to receive the exhaust flow from the exhaust manifold;
- a recirculation turbocharger having a compressor connected to receive the exhaust flow from the exhaust manifold in parallel with the main turbocharger, and a turbine connected to receive the exhaust flow from the main turbocharger to drive the compressor;
- and
- a control valve located downstream of the turbine of the recirculation turbocharger to regulate the exhaust flow through the compressor.
An exhaust system for an engine, comprising:
- a first exhaust manifold associated with a first plurality of engine combustion chambers, the first exhaust manifold configured to direct an exhaust flow from the engine;
- a second exhaust manifold associated with a second plurality of engine combustion chambers, the second exhaust manifold configured to direct an exhaust flow from the engine;
- a first main turbocharger connected to receive the exhaust flow from the first exhaust manifold;
- a second main turbocharger configured to receive the exhaust flow from the second exhaust manifold;
- a recirculation turbocharger having a compressor connected to receive the exhaust flow from the first and second exhaust manifolds in parallel with the first and second main turbochargers, and a turbine connected to receive the exhaust flow from the first and second main turbochargers to drive the compressor;
- and a control valve located downstream of the recirculation turbocharger to regulate the exhaust flow through the compressor.
A power system, comprising:
- an engine;
- an exhaust manifold configured to direct an exhaust flow from the engine;
- an intake manifold configured to direct air into the engine;
- a recirculation passage connecting the exhaust manifold to the intake manifold;
- a main turbocharger driven by the exhaust flow exhaust in the exhaust manifold to pressurize air in the intake manifold;
- an aftertreatment device located downstream of the main turbocharger to receive the exhaust flow from the main turbocharger;
- a recirculation turbocharger located within the recirculation passage and having a compressor connected to receive the exhaust flow from the exhaust manifold in parallel with the main turbocharger, and a turbine connected to receive the exhaust flow from the main turbocharger to drive the compressor;
- a bypass passage disposed between the turbine and a location downstream of the aftertreatment device;
- and
- a control valve located within the bypass passage downstream of the turbine to regulate the exhaust flow through the compressor.
Dependencies are inferred from the claim text.