Exhaust coolant system and method

Patent metadata

Field	Value
Publication number	US-12055087-B2
Application number	US-202318128836-A
Country	US
Kind code	B2
Filing date	Mar 30, 2023
Priority date	Jun 12, 2018
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

Abstract

A system includes an engine defining a water jacket fluidly coupled to a heat exchanger. An exhaust manifold defines an exhaust manifold cooling passage. A pump is fluidly coupled to the water jacket, and to each of the heat exchanger and the exhaust manifold cooling passage. An engine cooling circuit includes the water jacket, the heat exchanger, and the pump. An exhaust cooling circuit is selectively fluidly coupled to the engine cooling circuit. The exhaust cooling circuit includes the water jacket, the exhaust manifold cooling passage, and the pump. A control valve includes an inlet fluidly coupled to a first portion of the water jacket. A first outlet is fluidly coupled to a second portion of the water jacket. A second outlet is fluidly coupled to the exhaust cooling circuit. The control valve is structured to selectively control flow of coolant fluid through the second outlet.

First claim

What is claimed is:

1. A system comprising:
an engine defining a water jacket;
a heat exchanger in coolant fluid receiving communication with the water jacket, the heat exchanger structured to remove heat from a coolant fluid;
an exhaust manifold in exhaust gas receiving communication with the engine, the exhaust manifold defining an exhaust manifold cooling passage;
a pump in coolant fluid providing communication with the water jacket, the pump in coolant fluid receiving communication with each of the heat exchanger and the exhaust manifold cooling passage;
an engine cooling circuit comprising the water jacket, the heat exchanger, and the pump;
an exhaust cooling circuit in coolant fluid receiving communication with the pump, the exhaust cooling circuit comprising the exhaust manifold cooling passage and the pump; and
a control valve comprising:
an inlet in coolant fluid receiving communication with the exhaust manifold cooling passage, and
an outlet in coolant fluid providing communication with the engine cooling circuit, the control valve structured to selectively control flow of the coolant fluid through the outlet;

wherein the coolant fluid receiving communication of the heat exchanger with the water jacket bypasses the control valve.

2. The system of claim 1 , further comprising:
a turbocharger in exhaust gas receiving communication with the exhaust manifold, the turbocharger defining a turbine cooling passage in coolant fluid providing communication with the exhaust manifold cooling passage,
wherein the exhaust cooling circuit further comprises the turbine cooling passage.

3. The system of claim 2 , further comprising an exhaust aftertreatment component in exhaust gas receiving communication with the turbocharger, the exhaust aftertreatment component structured to remove a contaminant from the exhaust gas flowing therethrough.

4. The system of claim 2 , wherein:
the control valve is operable between a first position, a second position, and an intermediate position between the first position and the second position;
the control valve permits the coolant fluid to flow through the outlet in the first position; and
the control valve prevents the coolant fluid from flowing through the outlet in the second position.

5. The system of claim 4 , wherein the heat exchanger is separate from the exhaust manifold.

6. The system of claim 2 , wherein the system does not include a drain system that is structured to drain coolant from the exhaust cooling circuit.

7. The system of claim 2 , further comprising:
a first temperature sensor operatively coupled to the exhaust manifold, the first temperature sensor structured to measure a first surface temperature of the exhaust manifold; and
a controller operatively coupled to each of the first temperature sensor and the control valve, the controller comprising an operating conditions circuit structured to:
receive, from the first temperature sensor, a first temperature measurement value relating to the first surface temperature, and
determine the first surface temperature by interpreting the received first surface temperature value; and

an engine coolant control circuit structured to, in response to the first surface temperature exceeding a first predetermined value, transmit a first control signal to the control valve so as to actuate the control valve to a first position so as to permit the coolant fluid to flow through the engine cooling circuit.

8. The system of claim 7 , wherein:
the coolant fluid flows through the engine cooling circuit at a first flow rate, and
the engine coolant control circuit is structured to actuate the control valve to a second position so as to cause the coolant fluid to flow through the engine cooling circuit at a second flow rate different than the first flow rate.

9. The system of claim 8 , wherein the engine coolant control circuit is structured to define the second flow rate as a lowest possible value required to prevent the first surface temperature from exceeding the first predetermined value.

10. The system of claim 9 , wherein the engine coolant control circuit is structured to define the second flow rate as the lowest possible value required to further prevent the coolant fluid from boiling.

11. The system of claim 8 , wherein the engine coolant control circuit is structured to define the second flow rate so as to minimize an amount of energy transmitted from the exhaust gas to the coolant fluid.

12. The system of claim 7 , wherein:
the operating conditions circuit is further structured to:
receive, from the first temperature sensor, a second temperature measurement value relating to a second surface temperature of the exhaust manifold, and
determine the second surface temperature by interpreting the received second surface temperature value; and

the engine coolant control circuit is further structured to, in response to the second surface temperature falling below a second predetermined value, transmit a fourth control signal to the control valve so as to actuate the control valve to a second position so as to prevent coolant fluid flow through the engine cooling circuit.

13. The system of claim 1 , further comprising:
a turbocharger in exhaust gas receiving communication with the exhaust manifold, the turbocharger defining a turbine cooling passage in coolant fluid receiving communication with the exhaust manifold cooling passage, and in coolant fluid providing communication with the engine cooling circuit,
wherein the exhaust cooling circuit further comprises the turbine cooling passage.

14. A system comprising:
an engine defining a water jacket;
a heat exchanger in coolant fluid receiving communication with the water jacket, the heat exchanger structured to remove heat from a coolant fluid;
an exhaust manifold in exhaust gas receiving communication with the engine, the exhaust manifold defining an exhaust manifold cooling passage;
a pump in coolant fluid providing communication with the water jacket, the pump in coolant fluid receiving communication with each of the heat exchanger and the exhaust manifold cooling passage;
an engine cooling circuit comprising the water jacket, the heat exchanger, and the pump;
an exhaust cooling circuit in coolant fluid receiving communication with the pump, the exhaust cooling circuit comprising the exhaust manifold cooling passage and the pump;
a first control valve comprising:
a first inlet in coolant fluid receiving communication with the exhaust manifold cooling passage, and
a first outlet in coolant fluid providing communication with the engine cooling circuit, the first control valve structured to selectively control flow of the coolant fluid through the first outlet;

a turbocharger defining a turbine cooling passage in coolant fluid providing communication with the pump;
a turbine cooling circuit in coolant fluid receiving communication with the pump, the turbine cooling circuit comprising the turbine cooling passage and the pump; and
a second control valve comprising:
a second inlet in coolant fluid receiving communication with the pump, and
a second outlet in coolant fluid providing communication with the turbine cooling passage, the second control valve structured to selectively control flow of the coolant fluid through the second outlet.

15. A method for operating an engine cooling system, the engine cooling system including a pump structured to circulate a coolant fluid through an engine cooling circuit, wherein an exhaust cooling circuit is selectively fluidly coupled to the pump, the exhaust cooling circuit including an exhaust

Assignees

• Cummins Inc

Inventors

• Chrastil Brandon E
• Whittington Doyle E

Classifications

• F05D2260/232

  characterized by the cooling medium · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F02B39/005

  Cooling of pump drives · CPC title

• F01P2007/146

  using valves · CPC title

• F01P2003/021

  Cooling cylinders · CPC title