Apparatus for utilizing heat wasted from engine

Patent metadata

Field	Value
Publication number	US-10138842-B2
Application number	US-201515311235-A
Country	US
Kind code	B2
Filing date	May 14, 2015
Priority date	May 15, 2014
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

Apparatus for utilizing heat wasted from an engine includes: a Rankine cycle (31); a transmission mechanism that couples an output shaft of an expansion device (37) to a rotary shaft of an engine via an electromagnetic clutch (32) that can be engaged and disengaged; a passage (65) through which refrigerant exiting a heat exchanger (36) flows so as to bypass the expansion device (37); and a bypass valve (66) interposed in the passage. To stop the expansion device (37), the electromagnetic clutch (32) is switched from an engaged state to a disengaged state after switching the bypass valve (66) from a closed state to an open state. If the bypass valve (66) becomes stuck in the closed state, expansion device front-rear differential pressure limiting processing in which a front-rear differential pressure of the expansion device is limited while maintaining the electromagnetic clutch (32) in the engaged state is performed.

First claim

The invention claimed is:

1. An apparatus for utilizing heat wasted from an engine, comprising:
a Rankine cycle including:
a heat exchanger that recovers waste heat from the engine in a refrigerant;
an expansion device that generates power using the refrigerant at an outlet of the heat exchanger;
a condenser that condenses the refrigerant exiting the expansion device; and
a refrigerant pump that supplies the refrigerant exiting the condenser to the heat exchanger;

a transmission mechanism configured to couple an output shaft of the expansion device to a rotary shaft of the engine via an electromagnetic clutch, the electromagnetic clutch being configured to be engaged and disengaged;
a passage through which the refrigerant exiting the heat exchanger flows so as to bypass the expansion device;
a bypass valve interposed in the passage, and
a controller
wherein, the controller is programmed to:
switch the electromagnetic clutch from an engaged state to a disengaged state after switching the bypass valve from a closed state to an open state to stop the expansion device and
perform expansion device front-rear differential pressure limiting processing in which a front-rear differential pressure of the expansion device is limited while maintaining the electromagnetic clutch in the engaged state, in a case where the bypass valve becomes stuck in the closed state.

2. The apparatus for utilizing heat wasted from an engine as defined in claim 1 , wherein over-rotation of the expansion device is prevented by the front-rear differential pressure limiting processing while stopping the expansion device.

3. The apparatus for utilizing heat wasted from an engine as defined in claim 1 ,
wherein the expansion device front-rear differential pressure limiting processing is
expansion device front-rear differential pressure reducing processing
wherein the controller is programmed to:
reduce the expansion device front-rear differential pressure compared with a case where the bypass valve is not stuck in the closed state.

4. The apparatus for utilizing heat wasted from an engine as defined in claim 3 ,
wherein the expansion device front-rear differential pressure reducing processing is input heat amount reducing processing
wherein the controller is programmed to:
reduce an amount of heat recovered in the refrigerant by the heat exchanger compared with a case where the bypass valve is not stuck in the closed state.

5. The apparatus for utilizing heat wasted from an engine as defined in claim 3 ,
wherein the expansion device front-rear differential pressure reducing processing is heat released amount reducing processing
wherein the controller is programmed to:
reduce an amount of heat released from the refrigerant by the condenser compared with a case where the bypass valve is not stuck in the closed state.

6. The apparatus for utilizing heat wasted from an engine as defined in claim 5 ,
wherein the condenser is disposed parallel to a radiator for cooling engine cooling water so that the condenser is cooled by a radiator fan,
wherein the heat released amount reducing processing is radiator fan stopping processing in which the radiator fan is stopped, and
wherein the controller is programmed:

not to stop the radiator fan even in a case where the bypass valve is stuck in the closed state when a temperature of the engine cooling water equals or exceeds a predetermined value defined in advance.

7. The apparatus for utilizing heat wasted from an engine as defined in claim 3 ,
wherein the expansion device front-rear differential pressure reducing processing is expansion device workload reducing processing
wherein the controller is programmed to:
reduce a workload of the expansion device.

8. The apparatus for utilizing heat wasted from an engine as defined in claim 3 ,
wherein the condenser is a liquid-cooled condenser,
wherein the apparatus for utilizing heat wasted from an engine further comprises:
a cooling liquid passage for circulating second cooling liquid to the liquid-cooled condenser, the second cooling liquid being different from engine cooling water;
a cooling liquid pump interposed in the cooling liquid passage, the cooling liquid pump being configured to adjust a discharge amount of the second cooling liquid; and
a sub-radiator for cooling the second cooling liquid, and
wherein the expansion device front-rear differential pressure reducing processing is discharge amount reducing processing
wherein the controller is programmed to:
reduce a discharge amount of the cooling liquid pump compared with a case where the bypass valve is not stuck in the closed state.

9. The apparatus for utilizing heat wasted from an engine as defined in claim 8 ,
wherein the sub-radiator is disposed parallel to a radiator for cooling the engine cooling water so that the sub-radiator is cooled by a radiator fan,
wherein the controller is programmed:
not to stop the radiator fan even in a case where the bypass valve is stuck in the closed state when a second cooling liquid temperature at an outlet of the cooling liquid pump equals or exceeds a predetermined value.

10. The apparatus for utilizing heat wasted from an engine as defined in claim 3 ,
wherein the condenser is a liquid-cooled condenser,
wherein the apparatus for utilizing heat wasted from an engine further comprises:
a cooling liquid passage for circulating second cooling liquid to the liquid-cooled condenser, the second cooling liquid being different from engine cooling water;
a cooling liquid pump interposed in the cooling liquid passage, the cooling liquid pump being configured to adjust a discharge amount of the second cooling liquid; and
a sub-radiator for cooling the second cooling liquid, and
wherein the expansion device front-rear differential pressure reducing processing is heat released amount reducing processing
wherein the controller is programmed to:
reduce an amount of heat released from the second cooling liquid in the liquid-cooled condenser compared with a case where the bypass valve is not stuck it the closed state.

11. The apparatus for utilizing heat wasted from an engine as defined in claim 3 ,
wherein the condenser is a liquid-cooled condenser,
wherein the apparatus for utilizing heat wasted from an engine further comprises:
a cooling liquid passage for circulating second cooling liquid to the liquid-cooled condenser, the second cooling liquid being different from engine cooling water;
a cooling liquid pump interposed in the cooling liquid passage, the cooling liquid pump being configured to adjust a discharge amount of the second cooling liquid; and
a sub-radiator for cooling the second cooling liquid, and
wherein the expansion device front-rear differential pressure reducing processing is heat received amount reducing processing
wherein the controller is programmed to:
reduce an amount of heat received by the refrigerant in the liquid-cooled condenser compared with a case where the bypass valve is not stuck in the closed state.

Assignees

• Sanden Holdings Corp

Inventors

• Mizoguchi Shinichiro
• Nagai Hiroyuki
• Haraguchi Tomonori

Classifications

• Y02T10/166

  Cross-Sectional Technologies · mapped topic

• F02G2260/00

  Recuperating heat from exhaust gases of combustion engines and heat from cooling circuits · CPC title

• F02G5/04 Primary

  in combination with other waste heat from combustion engines · CPC title

• F01K23/06

  combustion heat from one cycle heating the fluid in another cycle · CPC title

• F01D25/00

  Component parts, details, or accessories, not provided for in, or of interest apart from, other groups · CPC title