Method for reducing air flow in an engine at idle
First Claim
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1. A method for a boosted engine, comprising:
- adjusting, via an electronic controller, an opening of a common shut-off valve (CSOV) based on and maintaining engine idling conditions, and each of a motive flow through an aspirator, and a crankcase ventilation flow from a crankcase, the motive flow and the crankcase ventilation flow combined together at a junction between the aspirator and an intake manifold and flowing through the CSOV when the CSOV is open.
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Abstract
Methods and systems are provided for controlling air ingestion in an engine during idle conditions. One example approach includes adjusting an opening of a common shut-off valve via an electronic controller, the common shut-off valve regulating each of motive flow through an aspirator and crankcase ventilation (CV) flow from a crankcase. As such, the common shut-off valve may be closed by the electronic controller during engine idle to cease each of the motive flow through the aspirator and the CV flow from the crankcase.
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Citations
21 Claims
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1. A method for a boosted engine, comprising:
adjusting, via an electronic controller, an opening of a common shut-off valve (CSOV) based on and maintaining engine idling conditions, and each of a motive flow through an aspirator, and a crankcase ventilation flow from a crankcase, the motive flow and the crankcase ventilation flow combined together at a junction between the aspirator and an intake manifold and flowing through the CSOV when the CSOV is open. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for an engine, comprising:
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an engine intake manifold; a crankcase coupled fluidically to the engine intake manifold via a crankcase ventilation (CV) valve and a common shut-off valve (CSOV); an intake throttle; a boost device including a compressor positioned in an intake passage upstream of the intake throttle; an aspirator positioned across each of the compressor and the intake throttle, the aspirator coupled to a vacuum consumption device; a motive inlet of the aspirator fluidically coupled to the intake passage upstream of the compressor; a motive outlet of the aspirator fluidically coupled to the engine intake manifold, downstream of the intake throttle, via the CSOV; the motive outlet joining an outlet of the CV valve at a junction between the aspirator and the engine intake manifold, the junction in a passage positioned in parallel with the intake passage, the intake throttle positioned in the intake passage; and a controller configured with computer readable instructions stored on non-transitory memory to; adjust the CSOV to a fully closed position in response to engine idle; and discontinue each of motive flow through the aspirator and CV flow through the CV valve synchronously. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for a boosted engine, comprising:
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during a first condition, increasing an opening of a common shut-off valve (CSOV); flowing motive air through an aspirator from a compressor inlet to an intake manifold via the CSOV to draw vacuum from a vacuum consumption device separate from a crankcase; and drawing blow-by gases from the crankcase through a crankcase ventilation (CV) valve and the CSOV into the intake manifold; and during a second condition, decreasing the opening of the CSOV; discontinuing motive air flow through the aspirator; and ceasing drawing of blow-by gases from the crankcase via the CV valve and the CSOV into the intake manifold. - View Dependent Claims (17, 18, 19, 20)
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21. A method for a boosted engine, comprising:
adjusting, via an electronic controller, an opening of a common shut-off valve (CSOV) based on engine idling conditions, a motive flow through an aspirator and a crankcase ventilation flow from a crankcase combined together at a junction and flowing through the CSOV when the CSOV is open, the junction between the aspirator and an intake manifold, the aspirator drawing vacuum from a brake booster.
Specification