Method and system for binary flow turbine control
First Claim
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1. A method for starting an engine, comprising:
- receiving signals from one or more sensors coupled to the engine via a controller;
adjusting a position of a scroll valve coupled to an inlet of one scroll of a multi-scroll exhaust turbine via the controller to expedite catalyst warm-up in response to an engine cold-start condition determined based on the signals; and
adjusting one or more of spark ignition timing, variable cam timing, an exhaust gas recirculation valve, and throttle position while moving the scroll valve based on the scroll valve position.
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Abstract
Methods and systems are provided for adjusting the opening of a scroll valve of a binary flow turbine. Scroll valve adjustments are used at different engine operating conditions to improve engine performance and boost response. Scroll valve adjustments are coordinated with wastegate and EGR valve adjustments for improved engine control.
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Citations
18 Claims
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1. A method for starting an engine, comprising:
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receiving signals from one or more sensors coupled to the engine via a controller; adjusting a position of a scroll valve coupled to an inlet of one scroll of a multi-scroll exhaust turbine via the controller to expedite catalyst warm-up in response to an engine cold-start condition determined based on the signals; and adjusting one or more of spark ignition timing, variable cam timing, an exhaust gas recirculation valve, and throttle position while moving the scroll valve based on the scroll valve position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for a boosted engine, comprising:
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receiving signals from one or more sensors coupled to the boosted engine via a controller; responsive to an engine cold-start condition determined based on the signals, starting the engine with a scroll valve coupled to an outer scroll of an exhaust turbine adjusted to be less open via the controller for a first, larger number of combustion events; and responsive to an engine hot-start condition determined based on the signals, starting the engine with the scroll valve adjusted to be more open via the controller for a second, smaller number of combustion events, wherein each of the first number and second number of combustion events is based on an exhaust temperature at a respective engine start condition. - View Dependent Claims (12, 13, 14, 15)
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16. An engine system, comprising:
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an engine; a turbocharger for providing a boosted aircharge to the engine, the turbocharger including an intake compressor and an exhaust turbine, the exhaust turbine including a first outer scroll and a second inner scroll; a scroll valve coupled between an engine exhaust manifold and an inlet of the first outer scroll; a wastegate included in a bypass coupled between an inlet and an outlet of the turbine; and a controller with instructions stored in non-transitory memory for, starting the engine and adjusting an opening of the scroll valve responsive to exhaust temperature for a number of cylinder events since a first combustion event during an engine cold-start condition. - View Dependent Claims (17, 18)
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Specification