Systems and methods for a split exhaust engine system
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United States of America Patent
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Jan 5, 2021
Grant Date -
Aug 29, 2019
app pub date -
May 14, 2019
filing date -
Dec 16, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
Methods and systems are provided for operating a split exhaust engine system that provides blowthrough air and exhaust gas recirculation to an intake passage via a first exhaust manifold and exhaust gas to an exhaust passage via a second exhaust manifold. In one example, the engine system may be installed in a hybrid vehicle, and, in response to a request to restart the engine while the vehicle is being propelled via motor torque only, the engine may be rotated unfueled via the motor torque at less than cranking speed while at least partially opening a valve disposed in a passage coupled between the first exhaust manifold and the intake passage. In another example, in response to the request to restart the engine, all exhaust valves of a second set of exhaust valves coupled to the second exhaust manifold may be deactivated.
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