Drive unit with an internal combustion engine and an exhaust gas turbocharger
AssigneeVoith Turbo GmbH & Co. KG
InventorsJürgen Friedrich, Peter Heilinger, Kai Kamossa
Life of this patent
Estimating the term…
Abstract
The invention relates to a drive unit, comprising an internal combustion engine with a crankshaft; an exhaust line; an exhaust gas turbine which is acted on by the exhaust gas line, which is arranged downstream of the internal combustion engine and has the purpose of transmitting a positive torque to the crankshaft in the traction mode; a hydrodynamic unit which is arranged downstream of the exhaust gas turbine and has two turbine blades which form a torus-shaped working chamber; the hydrodynamic unit has a drive connection to the drive train; and a parking brake is provided for securing the primary turbine wheel of the exhaust gas turbine.
Claims6
A method for operating a drive unit of a vehicle, the vehicle including an internal combustion engine having a crankshaft, an exhaust line, an exhaust gas turbine coupled to the exhaust line downstream from the internal combustion engine and operable to be acted upon by the exhaust line, a hydrodynamic unit coupled to the exhaust gas turbine and to the crankshaft, the hydrodynamic unit including freely rotatable rotor-turbine blade assemblies arranged within a working space, the method comprising the steps of:
- in a traction mode, operating the hydrodynamic unit as a hydrodynamic clutch so that the exhaust gas turbine transmits a positive torque to the crankshaft via the hydrodynamic unit;
- and
- in a braking mode, operating the hydrodynamic unit as a retarder to retard rotation of the crankshaft by braking one of the freely rotatable turbine blades of the hydrodynamic unit.
A drive unit of a vehicle, comprising:
- an internal combustion engine having a crankshaft;
- an exhaust line;
- an exhaust gas turbine coupled to the exhaust line downstream in the flow of exhaust gas from the internal combustion engine;
- and
- a hydrodynamic unit coupled to the exhaust gas turbine and to the crankshaft, the hydrodynamic unit including:
- a hydrodynamic clutch having a first working space filled with a first hydrodynamic fluid and first and second freely rotatable rotor-turbine blade assemblies arranged within the first working space;
- the hydrodynamic unit further including a hydrodynamic brake arranged coaxially with the hydrodynamic clutch, the hydrodynamic brake having a second working space and a freely rotatable rotor and a stator arranged within the second working space, the first rotatable rotor-turbine blade assembly of the hydrodynamic clutch being fixedly coupled to the rotor of the hydrodynamic brake so that the first rotatable rotor-turbine blade assembly and the rotor are rotatable together;
- wherein the second working space is emptied of a second hydrodynamic fluid in a traction mode so that the exhaust gas turbine transmits a positive torque to the crankshaft via the hydrodynamic unit, and the second working space is filled with the second hydrodynamic fluid in a braking mode to retard rotation of the crankshaft.
Dependencies are inferred from the claim text.