Abstract: Various methods for determining the fully closed position of a wastegate valve are provided. In one example, a non-closed position command for a wastegate valve in a low-lift region relative to a valve seat is received. Prior to executing the position command, the wastegate valve is only temporarily closed to thereby determine a fully closed position.

Abstract: Various methods for operating a wastegate are provided. In one example, a method of controlling a linked valve actuator system comprises adjusting the actuator near an end stop based on a learned uncertainty end stop region, the region based on operating conditions.

Abstract: Various methods for operating a wastegate are provided. In one example, a method of adjusting a linked valve actuator system comprises applying, in addition to feedback position control adjustments, a non-harmonic oscillation to an actuator of the linked valve actuator system.

Abstract: Various methods for compensating variation in the geometry and position of linkages and valve seats in wastegate assemblies are provided. In one example, a method of operating a wastegate in an internal combustion engine comprises, at engine startup, placing a wastegate valve at a seat, recording a position of the seat and associating the seat position with one or more operating parameters, and modifying a position of a wastegate actuator based on the seat position throughout engine operation.

Abstract: An aspirator coupled between an inlet of a compressor and an engine intake manifold may include sonic/supersonic expansion curves for both forward and reverse flow through the aspirator. Suction flow may enter a first entraining port coupling an ambient side of the aspirator with a vacuum source during reverse flow through the aspirator, whereas suction flow may enter a second entraining port coupling a manifold side of the aspirator with the vacuum source, the first entraining port counter sunk relative to a nominal slope of the aspirator to reduce flow disruption caused by the port during forward flow through the aspirator. A radial-flow aspirator shut-off valve arranged in series with the aspirator may be controlled to enable or disable motive flow through the aspirator, and motive flow may enter the valve in a direction perpendicular to a motive flow axis of the aspirator when the valve is open.

Abstract: A method for a hybrid-electric vehicle may comprise, while the hybrid-electric vehicle is moving and in an absence of fuel being directed to an engine, directing engine intake air through an ejector to supply vacuum to a brake booster independent of a brake booster vacuum.

Abstract: Various methods for determining the fully closed position of a wastegate valve are provided. In one example, a non-closed position command for a wastegate valve in a low-lift region relative to a valve seat is received. Prior to executing the position command, the wastegate valve is only temporarily closed to thereby determine a fully closed position.

Abstract: A method for controlling a powertrain of a vehicle is provided for traction control. The method comprises controlling wheel slip to a first amount, the first amount independent of a driver requested output; and controlling the wheel slip to a second amount when a vehicle speed is less than a threshold for a first duration, the second amount based on the driver requested output. In this way, the driver is allowed to modify the wheel slip in a controlled way during specific traction control conditions.

Abstract: A method for controlling a powertrain of a vehicle with wheels during a traction control event is provided. The method comprises adjusting wheel torque in response to an amplitude of a band-pass filtered driven wheel speed and a direction of acceleration of driven wheels.

Abstract: A method is provided for controlling a powertrain of a vehicle comprising wheels, and an accelerator pedal actuated by a driver. The method comprises controlling wheel slip to a first amount during a first road condition, the first amount independent of a driver requested output; and controlling the wheel slip to a second amount during a second road condition, the second amount based on the driver requested output, the second road condition having higher friction than the first road condition.

Abstract: A method for operating an engine having a variable cam timing control system, for controlling a camshaft angle in such engine. The method includes deactivating the variable cam timing system and setting the camshaft angle to a predetermined angle for a predetermined duration after failure in a sensor used to control the variable cam timing system and then reactivating the variable cam timing system after such predetermined time. The deactivating continues during the predetermined duration in the presence of a subsequent failure of the sensor during the predetermined duration. The reactivating comprises driving the cam angle to a camshaft angle established by the variable cam timing system in a predetermined manner. The reactivating occurs over a predetermined reactivation time.

Abstract: A method is provided for controlling a powertrain of a vehicle comprising wheels, and an accelerator pedal actuated by a driver. A method comprises controlling wheel slip to a first amount during a first road condition, the first amount independent of a driver requested output; and controlling the wheel slip to a second amount during a second road condition, the second amount based on the driver requested output, the second road condition having higher friction than the first road condition.

Abstract: A method for controlling a powertrain of a vehicle is provided for traction control. The method comprises controlling wheel slip to a first amount, the first amount independent of a driver requested output; and controlling the wheel slip to a second amount when a vehicle speed is less than a threshold for a first duration, the second amount based on the driver requested output.

Abstract: A method for controlling a powertrain of a vehicle with wheels during a traction control event is provided. The method comprises adjusting wheel torque in response to an amplitude of a band-pass filtered driven wheel speed and a direction of acceleration of driven wheels.

Abstract: A method for operating an engine having a variable cam timing control system, for controlling a camshaft angle in such engine. The method includes deactivating the variable cam timing system and setting the camshaft angle to a predetermined angle for a predetermined duration after failure in a sensor used to control the variable cam timing system and then reactivating the variable cam timing system after such predetermined time. The deactivating continues during the predetermined duration in the presence of a subsequent failure of the sensor during the predetermined duration. The reactivating comprises driving the cam angle to a camshaft angle established by the variable cam timing system in a predetermined manner. The reactivating occurs over a predetermined reactivation time.

Abstract: A method for adaptively learning is described that effectively and efficiently uses large amounts of data. Specifically, in one example, a scheme is described for determining whether to use data to adaptively learn parameters, or whether to discard the data. In this way, convergent data learning is possible.