Variable valvetrain turbocharged engine
First Claim
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1. An engine system comprising:
- a first cylinder including two exhaust ports coupled to a turbocharger via an integrated exhaust manifold;
a second cylinder including a first exhaust port coupled to the turbocharger via the integrated exhaust manifold and a second exhaust port coupled to a catalyst and not the turbocharger; and
a system including a camshaft with profiles and configured to;
only allow the second exhaust port to open during a first condition, andallow each exhaust port to open during a second condition.
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Abstract
Embodiments for routing exhaust in an engine are provided. In one example, an engine method comprises, during a first condition, firing a subset of cylinders and routing all exhaust from the subset of cylinders through a first exhaust manifold coupled directly to a catalyst and not a turbocharger, and during a second condition, firing all cylinders, routing a first portion of exhaust through a second exhaust manifold coupled to the turbocharger, and routing a second portion of exhaust through the first exhaust manifold. In this way, exhaust can be directly routed to a catalyst under some conditions.
38 Citations
20 Claims
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1. An engine system comprising:
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a first cylinder including two exhaust ports coupled to a turbocharger via an integrated exhaust manifold; a second cylinder including a first exhaust port coupled to the turbocharger via the integrated exhaust manifold and a second exhaust port coupled to a catalyst and not the turbocharger; and a system including a camshaft with profiles and configured to; only allow the second exhaust port to open during a first condition, and allow each exhaust port to open during a second condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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8. A method, comprising:
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during first conditions, firing a subset of cylinders and routing all exhaust from the subset of cylinders through a first manifold coupled directly to a catalyst and not a turbocharger; and during second conditions, firing all cylinders, routing a first portion of exhaust from all cylinders through a second manifold coupled to the turbocharger, and routing a second portion of exhaust from only the subset of cylinders through the first manifold.
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18. A method for an engine having a plurality of cylinders, each cylinder having two exhaust valves, comprising:
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during low speed, high load conditions, deactivating a subset of exhaust valves and activating at least a portion of remaining exhaust valves, the subset of exhaust valves controlling exhaust ports coupled to a catalyst via a first exhaust manifold and the remaining exhaust valves controlling exhaust ports coupled to a turbocharger via a second exhaust manifold, and directing exhaust from a first cylinder of the plurality of cylinders and exhaust from a second cylinder of the plurality of cylinders to the turbocharger via the second exhaust manifold; and during medium to high load and speed conditions, activating all exhaust valves of the engine, and directing all exhaust from the first cylinder to the turbocharger via the second exhaust manifold and directing exhaust from the second cylinder to the turbocharger via the second exhaust manifold and to the catalyst via the first exhaust manifold. - View Dependent Claims (19, 20)
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Specification