Method and system for improving turbocharger efficiency
First Claim
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1. A method for a boosted engine system, comprising:
- in response to boost demand,selectively deactivating cylinders by deactivating individual cylinder valve mechanisms to provide a cylinder pattern for selective cylinder deactivation, the cylinder pattern selected to direct exhaust from active cylinders into one of a plurality of engine turbines of turbochargers, the cylinder pattern selected to include a total number of deactivated/active cylinders, the deactivated engine cylinders selected based on their firing order, and selecting the one of the plurality of engine turbines based on turbine temperature.
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Abstract
Methods and systems are provided for enhancing turbocharger performance for a boosted engine system configured to operate with a pattern of deactivated cylinders. In one example, a method may include, in response to a demand for boost, operating with a cylinder pattern based on boost demand and turbocharger configuration. The specific pattern may depend on the pattern constraints imposed by engine load and NVH metrics.
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10 Claims
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1. A method for a boosted engine system, comprising:
in response to boost demand, selectively deactivating cylinders by deactivating individual cylinder valve mechanisms to provide a cylinder pattern for selective cylinder deactivation, the cylinder pattern selected to direct exhaust from active cylinders into one of a plurality of engine turbines of turbochargers, the cylinder pattern selected to include a total number of deactivated/active cylinders, the deactivated engine cylinders selected based on their firing order, and selecting the one of the plurality of engine turbines based on turbine temperature. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, comprising:
in response to a boost demand, selectively deactivating cylinders by deactivating individual cylinder valve mechanisms to provide a cylinder pattern for selective cylinder deactivation, the cylinder pattern selected to direct exhaust from active cylinders into each of a first turbine and a second turbine, wherein the cylinder pattern does not include consecutive deactivated cylinders feeding the same turbine, the cylinder pattern selected to include a total number of deactivated/active cylinders, the deactivated engine cylinders selected based on their firing order. - View Dependent Claims (8, 9, 10)
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