Drive train, particularly for trucks and rail vehicles

Abstract

The invention relates to a drive train, especially for a commercial vehicle, with an internal combustion engine which produces an exhaust gas stream; with an exhaust gas line which is connected to the internal combustion engine; with a supply air line system for supplying a supply air flow for combustion in the internal combustion engine, which supply air line system is connected to the internal combustion engine; with a steam cycle, comprising an expansion machine, at least one heat exchanger in order to evaporate the working medium of the steam cycle, and a condenser; the supply air line system comprises a fresh air line for supplying a fresh air flow for combustion in the internal combustion engine and a recirculating line for recirculating a part of the exhaust gas stream to the fresh air side for combustion in the internal combustion engine. The invention is characterized in that a plurality of heat exchangers for evaporation of the working medium of the steam cycle is provided in the recirculating line, and a further heat exchanger for evaporation of the working medium of the steam cycle is provided in the exhaust gas line which is supplied with an exhaust gas stream intended for being conducted to the ambient environment, and the working medium of the steam cycle is first conducted through a second heat exchanger in the recirculating line, then through the further heat exchanger in the exhaust gas line and then through a first heat exchanger in the recirculating line, with the recirculated part of the exhaust gas stream first being conducted through the first heat exchanger and then through the second heat exchanger, and is then cooled.

1 - 9 . (canceled) 
   
   
       10 . A drive train, especially for a commercial vehicle,
 with an internal combustion engine which produces an exhaust gas stream;   with an exhaust gas line which is connected to the internal combustion engine;   with a supply air line system for supplying a supply air flow for combustion in the internal combustion engine, which supply air line system is connected to the internal combustion engine;   with a steam cycle, comprising an expansion machine, at least one heat exchanger in order to evaporate the working medium of the steam cycle, and a condenser;   the supply air line system comprises a fresh air line for supplying a fresh air flow for combustion in the internal combustion engine and a recirculating line for recirculating a part of the exhaust gas stream to the fresh air side for combustion in the internal combustion engine; characterized in that   a plurality of heat exchangers for evaporation of the working medium of the steam cycle is provided in the recirculating line, and a further heat exchanger for evaporation of the working medium of the steam cycle in the exhaust gas line which is supplied with an exhaust gas stream intended for being conducted to the ambient environment, and the working medium of the steam cycle is first conducted through a second heat exchanger in the recirculating line, then through the further heat exchanger in the exhaust gas line and then through a first heat exchanger in the recirculating line, with the recirculated part of the exhaust gas stream first being conducted through the first heat exchanger and then through the second heat exchanger, and is thereby cooled.   
   
   
       11 . A drive train according to  claim 10 , characterized in that in the supply air line system a compressor is arranged which is especially driven by an exhaust gas turbine, in the exhaust gas stream and which especially compresses fresh air supplied to the internal combustion engine for combustion, and a heat exchanger is arranged in the supply air line system in the direction of flow behind the compressor and is supplied with the compressed supply air or a mixture of compressed supply air and recirculated exhaust gas stream and extracts heat from the same for evaporating the working medium of the steam cycle. 
   
   
       12 . A drive train according to  claim 11 , characterized in that several compressors or a multi-stage compressor is provided in the supply air line system, and the heat exchanger is arranged in the direction of flow between the compressors or compressor stages, or one heat exchanger each is arranged in the direction of flow behind one and especially behind each compressor. 
   
   
       13 . A drive train according to  claim 10 , characterized in that following the heat exchanger in the recirculating line or the second heat exchanger the recirculated part of the exhaust gas stream is conducted and cooled by a heat exchanger embedded in a cooling cycle, especially a vehicle cooling cycle. 
   
   
       14 . A drive train according to  claim 11 , characterized in that following the heat exchanger in the recirculating line or the second heat exchanger the recirculated part of the exhaust gas stream is conducted and cooled by a heat exchanger embedded in a cooling cycle, especially a vehicle cooling cycle. 
   
   
       15 . A drive train according to  claim 12 , characterized in that following the heat exchanger in the recirculating line or the second heat exchanger the recirculated part of the exhaust gas stream is conducted and cooled by a heat exchanger embedded in a cooling cycle, especially a vehicle cooling cycle. 
   
   
       16 . A drive train according to  claim 10 , characterized in that an exhaust gas turbine is arranged in the exhaust gas stream, by means of which drive power can be transferred to a crankshaft of the internal combustion engine, and the part of the exhaust gas stream which is conducted through the recirculating line is branched off from the exhaust gas stream before the exhaust gas turbine in the direction of flow. 
   
   
       17 . A drive train according to  claim 11 , characterized in that an exhaust gas turbine is arranged in the exhaust gas stream, by means of which drive power can be transferred to a crankshaft of the internal combustion engine, and the part of the exhaust gas stream which is conducted through the recirculating line is branched off from the exhaust gas stream before the exhaust gas turbine in the direction of flow. 
   
   
       18 . A drive train according to  claim 12 , characterized in that an exhaust gas turbine is arranged in the exhaust gas stream, by means of which drive power can be transferred to a crankshaft of the internal combustion engine, and the part of the exhaust gas stream which is conducted through the recirculating line is branched off from the exhaust gas stream before the exhaust gas turbine in the direction of flow. 
   
   
       19 . A drive train according to  claim 13 , characterized in that an exhaust gas turbine is arranged in the exhaust gas stream, by means of which drive power can be transferred to a crankshaft of the internal combustion engine, and the part of the exhaust gas stream which is conducted through the recirculating line is branched off from the exhaust gas stream before the exhaust gas turbine in the direction of flow. 
   
   
       20 . A drive train according to  claim 14 , characterized in that an exhaust gas turbine is arranged in the exhaust gas stream, by means of which drive power can be transferred to a crankshaft of the internal combustion engine, and the part of the exhaust gas stream which is conducted through the recirculating line is branched off from the exhaust gas stream before the exhaust gas turbine in the direction of flow. 
   
   
       21 . A drive train according to  claim 15 , characterized in that an exhaust gas turbine is arranged in the exhaust gas stream, by means of which drive power can be transferred to a crankshaft of the internal combustion engine, and the part of the exhaust gas stream which is conducted through the recirculating line is branched off from the exhaust gas stream before the exhaust gas turbine in the direction of flow. 
   
   
       22 . A drive train according to  claim 16 , characterized in that the further heat exchanger is arranged in the direction of flow behind the exhaust gas turbine in the exhaust gas stream. 
   
   
       23 . A drive train according to  claim 17 , characterized in that the further heat exchanger is arranged in the direction of flow behind the exhaust gas turbine in the exhaust gas stream. 
   
   
       24 . A drive train according to  claim 18 , characterized in that the further heat exchanger is arranged in the direction of flow behind the exhaust gas turbine in the exhaust gas stream. 
   
   
       25 . A drive train according to  claim 19 , characterized in that the further heat exchanger is arranged in the direction of flow behind the exhaust gas turbine in the exhaust gas stream. 
   
   
       26 . A drive train according to  claim 20 , characterized in that the further heat exchanger is arranged in the direction of flow behind the exhaust gas turbine in the exhaust gas stream. 
   
   
       27 . A drive train according to  claim 21 , characterized in that the further heat exchanger is arranged in the direction of flow behind the exhaust gas turbine in the exhaust gas stream.