초록 ▼

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 t

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.

대표청구항 ▼

1. 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 hydrod

1. 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. 2. The method of claim 1, wherein the braking of the freely rotatable rotor-turbine blade assemblies in the braking mode is performed using a parking brake.3. The method of claim 1, wherein the internal combustion engine further includes:a central processing unit, a sensor for sensing an operational state of the vehicle and for communicating a signal to the central processing unit in accordance with the operational state of the vehicle; and an actuator operable to be acted upon by the central processing unit to brake one of the freely rotatable rotor-turbine blade assemblies of the hydrodynamic unit in the braking mode. 4. The method of claim 1, wherein the braking of one the freely rotatable rotor-turbine blade assemblies in the braking mode is performed using a multi-disc clutch.5. 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. 6. The drive unit of claim 5, further comprising a bypass line connected in the exhaust line for diverting exhaust gasses in the exhaust line around the exhaust gas turbine.