Multi-stage exhaust turbocharger system
AssigneeJaguar Land Rover Limited
InventorJames TURNER
Life of this patent
Estimating the term…
Abstract
A multi-stage exhaust turbocharger has parallel high pressure stages (30, 40), and a single low pressure stage (60) in series. The low pressure stage (60) has a divided scroll turbine wheel 62 with each scroll fed independently from the respective turbines of the high pressure stage. Valves V1, V2, V3 determine flow paths to the respective turbines to ensure series sequential operation.
Claims21
1-22. (canceled)
An exhaust turbocharger system, comprising:
- a first turbocharger having a turbine inlet adapted to be fed directly from an exhaust manifold of an internal combustion engine;
- a first flow control valve;
- a second turbocharger having a turbine inlet adapted to be fed from said exhaust manifold via the first flow control valve;
- a second flow control valve having a valve inlet adapted to be fed directly from the exhaust manifold;
- a divided scroll third turbocharger having one turbine scroll in direct communication with a turbine outlet of said first turbocharger and a second turbine scroll in direct communication with a turbine outlet of said second turbocharger;
- a third flow control valve having a valve inlet adapted to be fed from a valve outlet of the second flow control valve;
- a valve outlet of the third flow control valve being for connection to an exhaust;
- a turbine outlet of the first turbocharger being connected to the valve inlet of the third flow control valve;
- and
- a turbine outlet of said second turbocharger being connected to the valve inlet of the third flow control valve.
The turbocharger system according to claim 23, wherein
- the divided scroll third turbocharger comprises a turbine wheel with two scrolls only;
- said two scrolls are arranged side by side on an axis of rotation thereof, or are arranged radially with respect to each other and a common axis of rotation thereof.
The turbocharger system according to claim 23, wherein the first and second independent turbochargers have respective turbine wheels rotatable in a common housing.
A turbocharger according to claim 23, wherein:
- a compressor inlet of said first turbocharger and a compressor inlet of said second turbocharger are connected to a compressor outlet of said third turbocharger;
- a fourth flow control valve has a valve inlet adapted to be fed from a compressor outlet of said second turbocharger;
- a fifth flow control valve has a valve inlet adapted to be fed from the compressor outlet of said third turbocharger, and a valve outlet to the valve inlet of the fourth flow control valve;
- a valve outlet of the fourth flow control valve is adapted to feed an inlet manifold of the internal combustion engine, and a compressor outlet of said first turbocharger is adapted to feed said inlet manifold.
The turbocharger system of claim 23, comprising a controller for determining sequential opening of said first and second control valves to permit sequential operation of respective turbines of said first, second and third turbochargers.
The turbocharger system of claim 23, comprising a controller for determining opening and closing of said control valves to permit series operation of said first, second and third turbochargers.
An internal combustion engine comprising a turbocharger system according to claim 23.
Dependencies are inferred from the claim text.