Methods and Systems for Variable Displacement Engine Control
First Claim
1. A method of operating an engine including a first and second cylinder group, comprising,selecting either the first or second cylinder group for deactivation;
- andclosing a valve coupled between the selected cylinder group and a downstream catalyst based on the selection.
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Accused Products
Abstract
Methods and systems are provided for selecting a group of cylinders for selective deactivation, in a variable displacement engine system, based at least on a regeneration state of an exhaust catalyst. The position of one or more valves and throttles may be adjusted based on the selective deactivation to reduce back-flow through the disabled cylinders while also maintaining conditions of a downstream exhaust catalyst. Pre-ignition and knock detection windows and thresholds may also be adjusted based on the deactivation to improve the efficiency of knock and pre-ignition detection.
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Citations
20 Claims
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1. A method of operating an engine including a first and second cylinder group, comprising,
selecting either the first or second cylinder group for deactivation; - and
closing a valve coupled between the selected cylinder group and a downstream catalyst based on the selection. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating an engine including a first cylinder group coupled to a first downstream catalyst via a first valve, and a second cylinder group coupled to a second downstream catalyst via a second valve, comprising:
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during a first condition, deactivating the first cylinder group and not the second cylinder group; during a second condition, deactivating the second cylinder group and not the first cylinder group; and during the first and second condition, adjusting each of the first valve and the second valve based on the deactivation. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An engine system, comprising:
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an engine; a first group of cylinders; a second group of cylinders; a first catalyst coupled to the first group of cylinders via a first valve; a second catalyst coupled to the second group of cylinders via a second valve; and a control system with computer readable instructions for, deactivating one or more fuel injectors from the first or the second group of cylinders based on engine operating conditions; closing the first valve when deactivating one or more fuel injectors from the first group of cylinders; and closing the second valve when deactivating one or more fuel injectors from the second group of cylinders. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification