Method of controlling a turbocharged engine
AssigneeFord Global Technologies, LLC
InventorsDonatus Andreas Josephine Kees, Anthemios Philemon Petridis
Life of this patent
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Abstract
A method of controlling a motor vehicle having a turbocharged engine is disclosed in which deactivation of cylinders of the engine is controlled to prevent the rotational speed of a turbocharger of the engine falling below a predefined limit TA, TB. Following commencement of a coast down of the motor vehicle all cylinders of the engine are first deactivated so as to maximise energy recuperation from the motor vehicle by a belt integrated starter generator driveably connected to the engine. However, if the speed of the turbocharger reaches one of the speed limits TA, TB at least one cylinder of the engine is reactivated to keep the turbocharger spinning.
Claims20
A method of controlling a turbocharged engine of a motor vehicle having a belt integrated starter-generator driveably connected to the engine to selectively recuperate energy from the motor vehicle during a coast down of the motor vehicle wherein the method comprises deactivating a predefined number of cylinders of the engine equipped with a cylinder deactivation mechanism when a coast down event commences and energy recovery is desired, operating the belt integrated starter-generator as a generator to recuperate energy from the motor vehicle, comparing an indication of current speed of the turbocharger with a predefined minimum turbocharger speed limit and reactivating at least one cylinder of the engine if the indicated speed of the turbocharger is less than the predefined speed limit.
A motor vehicle, comprising:
- a turbocharged engine, a belt integrated starter-generator driveably connected to the engine to selectively recuperate energy from the motor vehicle during a coast down of the motor vehicle, an energy storage system to store energy recuperated by the belt integrated starter-generator, a cylinder deactivation system to selectively deactivate the cylinders of the engine, an electronic controller to control the operation of the belt integrated starter-generator, the energy storage system and the cylinder deactivation system in response to an input indicative of the speed of rotation of the turbocharger and an input indicative of the operating state of the motor vehicle wherein, when the input indicative of the operating state of the motor vehicle indicates that a coast down state is present, the controller is operable to use the belt integrated starter-generator as a generator to recuperate energy from the motor vehicle, use the cylinder deactivation system to deactivate a predefined number of cylinders of the engine when a coast down event commences and energy recovery is required and is further operable to use the cylinder deactivation system to reactivate at least one cylinder of the engine if the input indicative of the speed of rotation of the turbocharger indicates that the speed of the turbocharger is less than a predefined speed limit.
A method, comprising:
- adjusting an operation of one or more cylinders of an engine in response to one or more of a coasting condition being met and an energy recovery being desired;
- and
- deactivating one or more cylinders based on turbocharger speed reaching a high speed limit of a turbocharger.
Dependencies are inferred from the claim text.