Abstract: A method of controlling a cylinder cut-out mode for an engine comprising the steps of: a) activating a cylinder cut-out mode in an idling mode or when running with an engine load factor of less than a deactivation threshold value, the cylinder cut-out mode comprising a plurality of sub-modes for different load factor ranges of the engine; b) while the cylinder cut-out mode is active, monitoring one or more deactivation variables; the one or more deactivation variables comprising: i) the engine load factor; and ii) an engine coolant temperature; and c) deactivating the cylinder cut-out mode if at least one of the engine load factor or the engine coolant temperature exceeds, respectively, the deactivation threshold value or an engine coolant temperature threshold value.

Abstract: A method for controlling a torque limit of an engine, which includes activating a power boost mode in which an enhanced engine torque limit for the engine is temporarily enabled in place of a normal engine torque limit for the engine. In this way, on receipt of a transient load demand during an operational period of the power boost mode, a fuel rate of the engine may be increased to attempt to meet the transient load demand while maintaining an engine torque of the engine within the enhanced engine torque limit.

Abstract: A method of controlling a cylinder cut-out mode for an engine comprising the steps of: a) activating a cylinder cut-out mode in which one or more cylinders of the engine are deactivated; b) while the cylinder cut-out mode is active, monitoring one or more deactivation variables; the one or more deactivation variables comprising one or more of: an inlet manifold air temperature; an engine load factor; an engine speed; and an engine coolant temperature; and c) deactivating the cylinder cut-out mode in order to reactivate any deactivated cylinders when at least one of the deactivation variables exceeds its threshold value.

Abstract: A method of controlling a cylinder cut-out mode for an engine comprising the steps of: a) activating a cylinder cut-out mode in which one or more cylinders of the engine are deactivated; b) while the cylinder cut-out mode is active, monitoring one or more deactivation variables; the one or more deactivation variables comprising one or more of: an inlet manifold air temperature; an engine load factor; an engine speed; and an engine coolant temperature; and c) deactivating the cylinder cut-out mode in order to reactivate any deactivated cylinders when at least one of the deactivation variables exceeds its threshold value.