Commercial vehicle with an internal combustion engine and a heat recovery system using the heat sources of that engine

1. A commercial vehicle including a driver's cab, an internal combustion engine ( 4 ), an exhaust gas system ( 7 ), a muffler ( 8 ) and a tail pipe ( 10 ); and a heat recovery system with a medium-containing circuit including at least one pump, an expander and a condenser, and wherein the waste heat of one of the internal combustion engine ( 4 ), hot engine assemblies and hot working media is convertable into useful power-boosting energy; said commercial vehicle comprising an evaporator ( 9 ) in the medium-containing circuit of the heat recovery system, said evaporator being one of

integrated into the muffler ( 8 ) by one of being installed into the tailpipe ( 10 ) within the muffler and partially replacing the tailpipe ( 10 ) within the muffler ( 8 );

attached externally to the muffler ( 8 ) and to an end section ( 10 b ) of the tailpipe ( 10 ) and within the muffler to an inlet section of the tailpipe;

integrated into the tailpipe ( 10 ) by one of being installed in the tailpipe ( 10 ) and partially replacing the tailpipe ( 10 ); and

integrated into a muffler ( 8 ) by being installed in an exhaust pipe ( 28 ) extending vertically behind the driver's cab ( 3 ).

2. A commercial vehicle of claim 1 , wherein said muffler ( 8 ) comprises:

a front-end wall ( 11 ), a rear-end wall ( 12 ), a circumferential outside wall ( 13 ) connecting said front-end wall and said rear-end wall;

an intake space ( 16 ), and an exhaust space ( 15 );

an intermediate wall ( 14 ) separating said intake space from said exhaust space ( 15 ), an intake pipe ( 17 ) leading into said intake space ( 16 );

said tailpipe ( 10 ) for holding said evaporator ( 9 ) having an intake section ( 10 a ) disposed in said exhaust space ( 15 ) upstream of said evaporator ( 9 ) and said end section ( 10 b ) disposed downstream of said evaporator ( 9 ) and extending out of said muffler through one of said rear-end wall ( 12 ) forming a boundary of said exhaust space and through said circumferential outside wall ( 13 ).

3. The commercial vehicle of claim 2 , wherein said evaporator ( 9 ) is attached to an inside surface of said rear-end wall ( 12 ) of said muffler ( 8 ) forming a boundary of said exhaust space ( 15 ).

4. The commercial vehicle of claim 2 , wherein the evaporator ( 9 ) additionally comprises a first connection piece ( 20 ) for supplying circulating liquid medium and a second connection piece ( 21 ) for discharging circulating liquid medium in the vapor state, said first and second connection pieces being guided out of said muffler ( 8 ) through one of said rear-end wall ( 12 ) and said circumferential outside wall ( 13 ) for connection to a feed line ( 22 ) for said circulating liquid medium and a discharge line ( 23 ) for the circulating medium in the vapor state.

5. The commercial vehicle of claim 1 , wherein said evaporator ( 9 ) is attached externally to said muffler ( 8 ); and wherein said the muffler ( 8 ) comprises a front-end wall ( 11 ), a rear-end wall ( 12 ), and a circumferential outside wall ( 13 ) connecting said front-end wall ( 11 ) and said rear-end wall ( 12 );

an intake pipe ( 17 ); and

said tailpipe ( 10 ), in an area of one of said end walls ( 11 , 12 ), being guided out of said muffler ( 8 ) through one of said end-walls and said circumferential outside wall ( 13 ); said tailpipe further extending at the outside of said evaporator.

6. The commercial vehicle of claim 1 , wherein said evaporator ( 9 ) is integrated into a section ( 10 b ) of said tailpipe adjacent said muffler ( 8 ) by one of being installed in said tailpipe section ( 10 b ) and partially replacing said tailpipe section ( 10 b ); said muffler comprising a front-end wall ( 11 ), a rear-end wall ( 12 ), and a circumferential outside wall ( 13 ) connecting said front-end wall and said rear-end wall; an intake pipe ( 17 ); and a tailpipe ( 10 ) which, in an area of an end wall ( 11 , 12 ), is guided out of said muffler through one of an end wall and said circumferential outside wall ( 13 ); said tailpipe further extending vertically upward behind said driver's cab.

7. The commercial vehicle of claim 5 , wherein said evaporator comprises a connection piece ( 20 ) for connection to a supply line ( 22 ) for circulating liquid medium and a connection piece ( 21 ) for connection to a discharge line ( 23 ) for the circulating medium in the vapor state.

8. The commercial vehicle of claim 1 , wherein said muffler comprises a substantially vertically arranged hollow cylinder ( 25 ) extending behind the driver's cab, said cylinder having a top wall ( 27 ) and a bottom wall ( 26 ); said tail pipe extending vertically upward behind the driver's cab and comprising a feed-side section ( 28 / 1 ) connected to said bottom wall ( 26 ) of said muffler and a discharge-side section connected to said top wall of said muffler, said evaporator ( 9 ) being integrated into said muffler; and wherein said evaporator further comprises a first connection piece ( 20 ) for the supply of a circulating liquid medium and a second connection piece ( 21 ) for the discharge from said evaporator ( 9 ) of the circulating medium in the vapor state, said first and second connection pieces being guided laterally out through said hollow cylindrical wall ( 25 ) of said muffler ( 8 ), said first connection piece ( 20 ) being connected externally to a supply line for the circulating liquid medium and said second connection piece ( 21 ) being connected to a discharge line ( 23 ) for the circulating medium in the vapor state.

9. The commercial vehicle of claim 1 , wherein the circulating medium is supplied to said evaporator in the liquid state, the circulating medium discharge from said evaporator is in the vapor state and fed to the expander for converting the energy of the vapor into mechanical energy for exerting a driving action on a crankshaft of the internal combustion engine as additional drive power.