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US 12,258,915 B2Granted
Engine system
AssigneeVolvo Truck Corporation
InventorsOscar Garnemark, Ulf Aronsson, Fredrik Rahm
Life of this patent
Estimating the term…
Abstract
An engine system for a vehicle is provided. The engine system includes a first and a second turbine arrangement arranged in parallel with each other. A rotational speed of a first turbo arrangement is controlled in response to a distance between a first compressor map position and a surge line of a compressor map being below a predetermined threshold distance.
Claims13
An engine system for a vehicle, the engine system comprising:
- a first electrically controlled turbo arrangement comprising a first turbine and a first compressor operably connected to each other by a first turbo shaft, wherein the first turbo arrangement comprises a first electric machine configured to control a rotational speed of the first turbo shaft, the first turbine being configured to be arranged in downstream fluid communication with a first exhaust manifold coupled to a first cylinder package of an internal combustion engine,
- a second electrically controlled turbo arrangement comprising a second turbine and a second compressor operably connected to each other by a second turbo shaft, wherein the second turbo arrangement comprises a second electric machine configured to control a rotational speed of the second turbo shaft, the second turbine being configured to be arranged in downstream fluid communication with a second exhaust manifold coupled to a second cylinder package of the internal combustion engine and in parallel with the first turbine, wherein the first and second electrically controlled turbo arrangements are individually controllable, and
- a control unit comprising a processor device operable to individually control a rotational speed of the first and second electrically controlled turbo arrangements by controlling the first and second electric machines, respectively, the processor device being configured to:
- determine a first pressure and a first mass flow of air pressurized by the first compressor, and a second pressure and a second mass flow of air pressurized by the second compressor,
- determine a first compressor map position of the air pressurized by the first compressor, the first compressor map position being a position, defined by the first pressure and the first mass flow, within a compressor map, the compressor map defining a surge line, and
- control the first electric machine to control the rotational speed of the first electrically controlled turbo arrangement in response to a distance between the first compressor map position and the surge line being below a predetermined threshold distance.
3 more elements
A method of controlling an engine system connected to an internal combustion engine, the engine system comprising:
- a first electrically controlled turbo arrangement comprising a first turbine and a first compressor operably connected to each other by a first turbo shaft, wherein the first turbo arrangement comprises a first electric machine configured to control a rotational speed of the first turbo shaft, the first turbine being arranged in downstream fluid communication with a first exhaust manifold coupled to a first cylinder package of the internal combustion engine, and
- a second electrically controlled turbo arrangement comprising a second turbine and a second compressor operably connected to each other by a second turbo shaft, wherein the second turbo arrangement comprises a second electric machine configured to control a rotational speed of the second turbo shaft, the second turbine being arranged in downstream fluid communication with a second exhaust manifold coupled to a second cylinder package of the internal combustion engine in parallel with the first turbine, wherein the first and second electrically controlled turbo arrangements are individually controllable,
- the method comprising:
- determining a first pressure and a first mass flow of air pressurized by the first compressor, and a second pressure and a second mass flow of air pressurized by the second compressor,
- determining a first compressor map position of the air pressurized by the first compressor, the first compressor map position being a position, defined by the first pressure and the first mass flow, within a compressor map, wherein the compressor map defines a surge line, and
- controlling the first electric machine to control the rotational speed of the first electrically controlled turbo arrangement in response to a distance between the first compressor map position and the surge line being below a predetermined threshold distance.
3 more elements
Dependencies are inferred from the claim text.