Abstract: Methods and systems are provided for a turbocharger of a hybrid vehicle. In one example, a method comprising spinning a turbine in a reverse direction during an engine off event to execute a diagnostic test.

Abstract: Methods and systems are provided for diagnostics of a gasoline particulate filter in an exhaust system after confirming that specific conditions are met including that an exhaust tuning valve is not degraded. In one example, a method may include indicating degradation of a hose coupled across a particulate filter responsive to a difference between a first differential pressure and a second differential pressure being greater than a threshold, the first differential pressure measured by a differential pressure sensor positioned in the hose responsive to a downstream exhaust tuning valve being fully open, the second differential pressure measured by the differential pressure sensor responsive to the exhaust tuning valve being fully closed.

Abstract: Methods and systems are provided for adjusting a position of an exhaust valve that regulates engine exhaust noise. In one example, the position of the exhaust valve is adjusted according to a road grade estimate. The road grade estimate may be based on a vehicle's present position on a road or a position that is a distance away from the vehicle's present position.

Abstract: Vehicle sound attenuation systems and methods are provided herein. An example method includes determining a triggering event for a vehicle using an advanced driver assisted technology system, and controlling a sound enhancing system of the vehicle in response to the triggering event. Controlling the sound enhancing system may include attenuating engine or exhaust sound produced by the sound enhancing system of the vehicle.

Abstract: Methods and systems are provided for opportunistically mitigating an intermittent degradation of an active exhaust valve. In one example, a method may include differentiating between a permanent degradation of the active exhaust valve and an intermittent degradation of the active exhaust valve and adjusting actuation of the valve based on a vehicle operating condition and a road condition to mitigate the intermittent degradation.

Abstract: A method for operating a vehicle that includes a passenger is described. In one example, the method adjusts vehicle suspension and exhaust system sound in response to characteristics of the passenger that are monitored via a camera and a microphone. The method may operate the vehicle suspension and exhaust system in a way that sooths the passenger.

Abstract: Methods and systems are provided for operating a vehicle that includes an exhaust gas heat recovery device having an exhaust heat recovery device valve that may be selectively opened and closed. In one example, a method may include storing heat from exhaust gases in a phase changing material and releasing the stored heat to surroundings of an exhaust heat recovery device valve to reduce a possibility of the exhaust heat recovery device valve sticking.

Abstract: Methods and systems are provided for an exhaust tuning valve. In one example, a method may include adjusting the exhaust tuning valve in response to a steering wheel angle input. Additionally or alternatively, the position of the exhaust tuning valve may be adjusted differently in response to a same steering wheel angle input during different driving behaviors.

Abstract: Methods and systems are provided for improving completion rates for engine system diagnostics for hybrid electric vehicles. In one example, a method may include in response to fueling of the engine of a hybrid electric vehicle being discontinued, establishing an air flow from an intake to an exhaust of the engine by relying on an electric motor to rotate the engine unfueled, and conducting a plurality of diagnostic monitors that rely on the air flow prior to reactivation of fueling of the engine. In this way, diagnostic monitor completion rates may be improved for hybrid electric vehicles, and fuel economy may be improved by coordinating the plurality of diagnostic monitors to be conducted during times when the engine is not fueled.

Abstract: Methods and systems are provided for opportunistically mitigating an intermittent degradation of an active exhaust valve. In one example, a method may include differentiating between a permanent degradation of the active exhaust valve and an intermittent degradation of the active exhaust valve and adjusting actuation of the valve based on a vehicle operating condition and a road condition to mitigate the intermittent degradation.

Abstract: Methods and systems are provided for diagnostics of a gasoline particulate filter in an exhaust system after confirming that specific conditions are met including that an exhaust tuning valve is not degraded. In one example, a method may include indicating degradation of a hose coupled across a particulate filter responsive to a difference between a first differential pressure and a second differential pressure being greater than a threshold, the first differential pressure measured by a differential pressure sensor positioned in the hose responsive to a downstream exhaust tuning valve being fully open, the second differential pressure measured by the differential pressure sensor responsive to the exhaust tuning valve being fully closed.