Waste heat recovery system

Patent metadata

Field	Value
Publication number	US-10927712-B2
Application number	US-201716333498-A
Country	US
Kind code	B2
Filing date	Aug 22, 2017
Priority date	Sep 16, 2016
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

The invention relates to a waste heat recovery system ( 3 ) for an internal combustion engine ( 1 ), having a working fluid circuit ( 19 ) with a condenser ( 31 ) that is also connected to a working fluid cooling circuit ( 34 ), and wherein the working fluid cooling circuit ( 34 ) has a cooler ( 35 ). The invention provides a waste heat recovery system ( 3 ) having a working fluid cooling circuit ( 34 ) which is improved in comparison to one design of a working fluid cooling circuit ( 34 ). This is achieved by the working fluid cooling circuit ( 34 ) having a cooler bypass ( 46 ). This configuration makes it generally possible for part of the coolant volume flow to be routed past the cooler ( 35 ). This is advantageous in particular at low temperatures since otherwise very low pressures arise in the working fluid cooling circuit ( 34 ).

First claim

The invention claimed is:

1. A waste heat recovery system ( 3 ) for an internal combustion engine ( 1 ), the waste heat recovery system having a working-fluid circuit ( 19 ) that conducts a working fluid and that includes a condenser ( 31 ) wherein the condenser is connected to a working-fluid cooling circuit ( 34 ) that conducts a coolant and that is separate from the working-fluid circuit ( 19 ) such that the working fluid and the coolant do not mix, and wherein the working-fluid cooling circuit ( 34 ) has a cooler ( 35 ), characterized in that the working-fluid cooling circuit ( 34 ) has a cooler bypass ( 46 ), wherein the working-fluid cooling circuit ( 34 ) is independent from a coolant circuit ( 20 ) of the internal combustion engine ( 1 ), wherein the working-fluid cooling circuit ( 34 ) includes a retarder heat exchanger ( 26 ) configured to cool hydraulic fluid from a retarder ( 28 ) of the internal combustion engine ( 1 ).

2. The waste heat recovery system ( 3 ) as claimed in claim 1 , characterized in that the cooler bypass ( 46 ) has a cooler bypass control valve ( 47 ).

3. The waste heat recovery system ( 3 ) as claimed in claim 2 , characterized in that the cooler bypass control valve ( 47 ) is arranged on an input side of the cooler bypass ( 46 ) in the working-fluid cooling circuit ( 34 ).

4. The waste heat recovery system ( 3 ) as claimed in claim 2 , characterized in that the cooler bypass control valve ( 47 ) is arranged on an output side of the cooler bypass ( 46 ) in the working-fluid cooling circuit ( 34 ).

5. The waste heat recovery system ( 3 ) as claimed in claim 2 , characterized in that the cooler bypass control valve ( 47 ) is a 3-way valve.

6. The waste heat recovery system ( 3 ) as claimed in claim 2 , characterized in that the cooler bypass control valve ( 47 ) is a thermostat.

7. The waste heat recovery system ( 3 ) as claimed in claim 1 , characterized in that the working-fluid cooling circuit ( 34 ) has a working-fluid cooling pump ( 50 ).

8. The waste heat recovery system ( 3 ) as claimed in claim 1 , characterized in that the working-fluid cooling circuit ( 34 ) has a condenser bypass ( 44 ) with respect to the condenser ( 31 ).

9. The waste heat recovery system ( 3 ) as claimed in claim 8 , characterized in that the condenser bypass ( 44 ) has a condenser bypass control valve ( 45 ).

10. A waste heat recovery system ( 3 ) for an internal combustion engine ( 1 ), the waste heat recovery system having a working-fluid circuit ( 19 ) that conducts a working fluid and that includes a condenser ( 31 ) wherein the condenser is connected to a working-fluid cooling circuit ( 34 ) that conducts a coolant and that is separate from the working-fluid circuit ( 19 ) such that the working fluid and the coolant do not mix, and wherein the working-fluid cooling circuit ( 34 ) has a cooler ( 35 ), characterized in that the working-fluid cooling circuit ( 34 ) has a cooler bypass ( 46 ), wherein the working-fluid cooling circuit ( 34 ) is independent from a coolant circuit ( 20 ) of the internal combustion engine ( 1 ), wherein the working-fluid cooling circuit ( 34 ) includes a lubricating oil heat exchanger ( 25 ) configured to cool lubricating oil from the internal combustion engine ( 1 ).

11. The waste heat recovery system ( 3 ) as claimed in claim 10 , characterized in that the cooler bypass ( 46 ) has a cooler bypass control valve ( 47 ).

12. The waste heat recovery system ( 3 ) as claimed in claim 11 , characterized in that the cooler bypass control valve ( 47 ) is arranged on an input side of the cooler bypass ( 46 ) in the working-fluid cooling circuit ( 34 ).

13. The waste heat recovery system ( 3 ) as claimed in claim 11 , characterized in that the cooler bypass control valve ( 47 ) is arranged on an output side of the cooler bypass ( 46 ) in the working-fluid cooling circuit ( 34 ).

14. The waste heat recovery system ( 3 ) as claimed in claim 11 , characterized in that the cooler bypass control valve ( 47 ) is a 3-way valve.

15. The waste heat recovery system ( 3 ) as claimed in claim 11 , characterized in that the cooler bypass control valve ( 47 ) is a thermostat.

16. The waste heat recovery system ( 3 ) as claimed in claim 10 , characterized in that the working-fluid cooling circuit ( 34 ) has a working-fluid cooling pump ( 50 ).

17. The waste heat recovery system ( 3 ) as claimed in claim 10 , characterized in that the working-fluid cooling circuit ( 34 ) has a condenser bypass ( 44 ) with respect to the condenser ( 31 ).

18. The waste heat recovery system ( 3 ) as claimed in claim 17 , characterized in that the condenser bypass ( 44 ) has a condenser bypass control valve ( 45 ).

Assignees

• Bosch Gmbh Robert

Inventors

• Zuschlag Axel
• Rewers Gregory
• Richter Michael

Classifications

• F01K23/10

  with exhaust fluid of one cycle heating the fluid in another cycle (F01K17/025 takes precedence) · CPC title

• F01P9/06

  by use of refrigerating apparatus, e.g. of compressor or absorber type · CPC title

• F01K23/065 Primary

  the combustion taking place in an internal combustion piston engine, e.g. a diesel engine · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F01K23/101

  Regulating means specially adapted therefor (F01K23/105, F01K23/108 take precedence) · CPC title