Thermodynamic engine

• US 7,520,133 B2
• Filed: 06/20/2005
• Issued: 04/21/2009
• Est. Priority Date: 12/19/2002
• Status: Expired due to Fees

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: Haas, Tobias, Preis, Michael, Obieglo, Andreas, Freitag, Gunnar, Hoetger, Michael, Clemens, Herbert, Freymann, Raymond
• Primary Examiner(s): McKinnon; Terrell L
• Assistant Examiner(s): JETTON, CHRISTOPHER M
• Application Number:
  US11/155,598
• Publication Number:
  US 20050229595A1
• Time in Patent Office: 1,401 Days
• Field of Search: 602/72, 603/17, 603/20, 60613-624, 606/45, 606/93
• US Class Current: 60/618
• CPC Class Codes: F01K 23/065 the combustion taking place in an internal combustion piston engine, e.g. a diesel engine
• CPC Class Codes: F02G 1/04 of closed-cycle type
• CPC Class Codes: F02G 5/02 Profiting from waste heat of exhaust gases
• CPC Class Codes: F02G 5/04 in combination with other waste heat from combustion engines
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A thermodynamic engine converts the superheated steam of at least one working medium into kinetic energy using a decompression device. Said engine includes a low-temperature circuit, in which a first working medium is transported through a first heat exchanger and subsequently through the decompression device and a high-temperature circuit, in which a second working medium is transported through a second heat exchanger and subsequently through the decompression device. The first heat exchanger and the second heat exchanger are located in the exhaust system of an internal combustion engine, and the internal combustion engine a coolant circuit can be used to heat the working mediums in separate collection containers.

Claims

1. Thermodynamic engine which converts thermal energy of a superheated vapor into kinetic energy in a decompression device, comprising:

a low-temperature circuit in which a first working medium is transported by a first pump through a first heat exchanger and subsequently through the decompression device, and

a high-temperature circuit in which a second working medium is transported by a second pump through a second heat exchanger and subsequently through the decompression device,

the first heat exchanger and the second heat exchanger being provided on an exhaust gas system of an internal combustion engine,

wherein

the internal combustion engine has a coolant circuit which regulates the temperature of the first working medium in a first collection container,

the low-temperature circuit has an injection device which injects first working medium withdrawn from the low-temperature circuit back into the low-temperature circuit in the vicinity of the first heat exchanger, and

the high-temperature circuit between the second heat exchanger and the decompression device has a heating device for the second working medium.

2. Device according to claim 1, wherein the first working medium in the first collection container is present in at least one of a gaseous and a liquid phase.

3. Device according to claim 2, wherein the injection device injects the first working medium in the liquid phase back into the low-temperature circuit.

4. Device according to claim 1, wherein the temperature of the first working medium in the first collection container is regulated by the second working medium.

5. Device according to claim 1, wherein the high-temperature circuit has a second collection container for the second working medium.

6. Device according to claim 5, wherein the temperature of the second working medium in the second collection container is regulated by the coolant circuit before being introduced into the second heat exchanger.

7. Device according to claim 1, wherein the heating device is operated by at least one of electrical power and a fuel.

8. Device according to claim 7, wherein the fuel for the heating device is also provided for the internal combustion engine.

9. Device according to claim 1, wherein the heating device is situated radially around the exhaust gas system or is situated, at least in sections, directly on the exhaust gas system.

10. Device according to claim 9, wherein the exhaust gas system has two catalytic cleaning devices, and the heating device is situated between one of the catalytic cleaning devices and downstream from the catalytic cleaning devices.

11. Device according to claim 1, wherein the first and second heat exchangers are provided downstream from the catalytic cleaning devices in the direction of flow of an exhaust gas.

12. Device according to claim 1, wherein the volumetric flow of at least one of the first and second working medium passing through the decompression device can be regulated.

13. Device according to claim 1, wherein the low-temperature circuit has a condenser situated downstream from the decompression device in the direction of transport of the working medium, and a third pump is provided in the low-temperature circuit between the condenser and the first collection container.

14. A thermodynamic engine, comprising:

a low-temperature circuit, in which a first working medium is transported by a first pump through a first heat exchanger and subsequently through a decompression device which generates kinetic motion; and

a high-temperature circuit, in which a second working medium is transported by a second pump through a second heat exchanger and subsequently through the decompression device,

wherein

the first heat exchanger and the second heat exchanger are arranged on an exhaust gas system of an internal combustion engine such that the heat exchangers receive exhaust heat from the internal combustion engine,

a temperature of a portion of the first working medium in a first collection container may be regulated by an engine coolant circuit of the internal combustion engine,

the low-temperature circuit has an injection device which injects first working medium withdrawn from the low-temperature circuit back into the low-temperature circuit in the vicinity of the first heat exchanger, and

the high-temperature circuit has a heating device between the second heat exchanger and the decompression device for heating the second working medium.