Methods and Systems for Variable Displacement Engine Control
First Claim
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1. A method, comprising:
- operating a boosted engine including first and second parallel intake passages leading to first and second cylinder groups respectively, the first intake passage including a first throttle downstream of a first turbocharger compressor, the second intake passage including a second throttle downstream of a second turbocharger compressor, comprising;
deactivating the first cylinder group; and
adjusting each of the first and second throttle responsive to the deactivation.
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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.
60 Citations
20 Claims
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1. A method, comprising:
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operating a boosted engine including first and second parallel intake passages leading to first and second cylinder groups respectively, the first intake passage including a first throttle downstream of a first turbocharger compressor, the second intake passage including a second throttle downstream of a second turbocharger compressor, comprising; deactivating the first cylinder group; and adjusting each of the first and second throttle responsive to the deactivation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of operating a boosted engine, comprising,
selecting either a first or a second group of cylinders for deactivation; - and
based on the selection, adjusting a first throttle coupled upstream of a first compressor in a first intake passage of the first group of cylinders, and a second throttle coupled upstream of a second compressor in a second intake passage of the second group of cylinders. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An engine system, comprising,
a first group of cylinders coupled to a first catalyst; -
a second group of cylinders coupled to a second catalyst; a first intake passage coupled to the first group of cylinders including a first turbocharger compressor; a second, parallel intake passage coupled to the second group of cylinders including a second turbocharger compressor; a first valve in the first intake passage, downstream of the first compressor; a second valve in the second intake passage, downstream of the second compressor; a throttle valve coupled downstream of the first and second valves; and a control system with computer readable instructions for, deactivating the first group of cylinders when the first catalyst is less regenerated than the second catalyst; closing the first valve; and adjusting a position of the second valve and the throttle valve while operating the second compressor to provide an amount of boost to the second group of cylinders. - View Dependent Claims (20)
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Specification