Patent ID: 11939929
Assignee: DEERE & COMPANY
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  B  Y | IPC B  F

Claim 12:
13. An engine system for a non-road vehicle, the engine system comprising:
an engine having one or more piston-cylinder arrangements communicating with an intake manifold and an exhaust manifold;
an electrical power system configured to provide electrical power in the engine system, the electrical power system comprising an energy storage device and an electrical bus; and
an electrified air system powered by the electrical power from the electrical power system to selectively increase a flow of intake air and exhaust gas to the engine, the electrified air system comprising:
an exhaust gas recirculation (EGR) pump operable to recirculate a portion of exhaust gas output from the exhaust manifold back to the intake manifold; and
an electric turbocharger comprising:
a turbine in communication with the exhaust manifold;
a compressor in communication with the intake manifold and driven by the turbine via a shaft coupled therebetween; and
an electrical machine coupled to the shaft to provide rotational power thereto or receive rotational power therefrom; and

a controller, including a processor and memory architecture, operably connected with the electrified air system to control operation thereof, the controller configured to:
monitor engine speed and engine load during operation of the engine;
selectively operate the electrical machine in a motoring mode and a generating mode based on the engine speed and the engine load wherein the electrical machine provides rotational power to the shaft to output boosted intake air to the engine when operating in the motoring mode and transforms rotational power from the shaft into electrical power that is provided back into the electrical power system when operating in the generating mode; and
selectively operate the EGR pump in an EGR motoring mode and an EGR generating mode based on the engine speed and engine load, wherein the EGR pump recirculates the portion of exhaust gas when operating in the EGR motoring mode and provides electrical power back into the electrical power system, responsive to a flow of exhaust gas flowing through the EGR pump, when operating in the EGR generating mode; and
selectively operate the EGR pump in a reverse mode to supply compressed intake air from the intake manifold into an EGR gas passageway upstream of the turbine based on the engine speed and engine load, such that the turbine receives both exhaust gas and compressed intake air by which the turbine drives the compressor to boost compressed charge air to the engine to increase engine power.