Heated inlet of a crankcase ventilation system

Patent metadata

Field	Value
Publication number	US-10876445-B2
Application number	US-201916265587-A
Country	US
Kind code	B2
Filing date	Feb 1, 2019
Priority date	Feb 1, 2019
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

A method for ventilating a crankcase of an internal combustion engine using natural gas as a fuel source may include filtering ambient air through an air filter. The method may also include heating the filtered ambient air by a jacket heat exchanger. The method may further include directing the heated ambient air through an inlet of the crankcase to purge blow-by gases including natural gas from the crankcase.

First claim

What is claimed is:

1. A method for ventilating a crankcase of an internal combustion engine using natural gas as a fuel source, comprising:
filtering ambient air through an air filter;
heating the filtered ambient air by a jacket heat exchanger, wherein the jacket heat exchanger includes:
a shell in fluid communication with a cooling system of the engine for receiving and directing coolant from the cooling system through the heat exchanger; and
one or more tubes located inside the shell, the one or more tubes in fluid communication with the air filter for receiving and directing the filtered ambient air through the heat exchanger, wherein the coolant is flowed around the one or more tubes for heating the filtered ambient air; and

directing the heated ambient air through an inlet of the crankcase to purge blow-by gases including natural gas from the crankcase.

2. The method of claim 1 , wherein the shell includes an inlet coupled to the cooling system at a first location and an outlet coupled to the cooling system at a second location downstream of the first location.

3. The method of claim 2 , wherein the coolant is flowed from the inlet to the outlet around the one or more tubes in a serpentine pattern.

4. The method of claim 3 , wherein the inlet is coupled to the cooling system downstream of a pump of the cooling system, and
wherein the outlet is coupled to the cooling system upstream of an outlet of the cooling system.

5. The method of claim 4 , wherein heating the filtered ambient air includes heating the filtered ambient air to a temperature of at least fifty-five degrees Celsius (55° C.).

6. The method of 1 , wherein the blow-by gases further include at least one of air, fuel, or combustion gases.

7. The method of claim 1 , further comprising:
exhausting the purged natural gas through an outlet and out of the engine.

8. The method of claim 1 , wherein the engine is a stationary engine.

9. The method of claim 1 , wherein the jacket heat exchanger further includes one or more baffles around the one or more tubes for directing and distributing the coolant around the one or more tubes.

10. The method of claim 9 , wherein each of the one or more baffles includes a generally semi-circle shape, and wherein the one or more baffles are arranged such that the openings of the semi-circle shape are offset with respect to one another.

11. A crankcase ventilation system for an internal combustion engine using natural gas as a fuel source, comprising:
an air filter for receiving and filtering ambient air;
a jacket heat exchanger in fluid communication with the air filter for heating the filtered ambient air, wherein the jacket heat exchanger includes:
a shell in fluid communication with a cooling system of the engine for receiving and directing coolant from the cooling system through the heat exchanger; and

one or more tubes located inside the shell, the one or more tubes in fluid communication with the air filter for receiving and directing the filtered ambient air through the heat exchanger, wherein the coolant is flowed around the one or more tubes for heating the filtered ambient air; and
a crankcase of the internal combustion engine having an inlet in fluid communication with the heat exchanger for receiving the heated ambient air.

12. The crankcase ventilation system of claim 11 , wherein the shell includes an inlet coupled to the cooling system at a first location and an outlet coupled to the cooling system at a second location downstream of the first location.

13. The crankcase ventilation system of claim 12 , wherein the inlet is coupled to the cooling system downstream of a pump of the cooling system, and
wherein the outlet is coupled to the cooling system upstream of an outlet of the cooling system.

14. The crankcase ventilation system of claim 13 , wherein the jacket heat exchanger further includes one or more baffles around the one or more tubes for directing and distributing the coolant around the one or more tubes.

15. The crankcase ventilation system of claim 14 , wherein the one or more baffles are arranged such that coolant is flowed from the inlet to the outlet around the one or more tubes in a serpentine pattern.

16. The crankcase ventilation system of claim 11 , further including an outlet in fluid communication with the crankcase for exhausting blow-by gases from the crankcase and out of the engine.

17. The crankcase ventilation system of claim 15 , wherein each of the one or more baffles includes a generally semi-circle shape, and wherein the one or more baffles are arranged such that the openings of the semi-circle shape are offset with respect to one another to direct the coolant in the serpentine pattern.

18. A crankcase ventilation system for an internal combustion engine using natural gas as a fuel source, comprising:
an air filter for receiving and filtering ambient air;
a jacket heat exchanger in fluid communication with the air filter and located downstream of the air filter, the jacket heat exchanger including:
a shell having an inlet and an outlet located downstream of the inlet, the inlet and outlet coupled to a cooling system of the engine such that the shell is in fluid communication with the cooling system for flowing coolant through the shell;
one or more tubes located inside the shell, the one or more tubes in fluid communication with the air filter for receiving and directing the filtered ambient air through the heat exchanger, wherein the coolant is flowed around the one or more tubes for heating the filtered ambient air; and
one or more baffles around the one or more tubes for directing and distributing the coolant around the one or more tubes; and

a crankcase of the internal combustion engine having an inlet in fluid communication with the heat exchanger for receiving the heated ambient air.

19. The system of claim 18 , wherein the one or more baffles are arranged such that the coolant is flowed from the inlet to the outlet around the one or more tubes in a serpentine pattern.

20. The crankcase ventilation system of claim 19 , wherein each of the one or more baffles includes a generally semi-circle shape, and wherein the one or more baffles are arranged such that the openings of the semi-circle shape are offset with respect to one another to direct the coolant in the serpentine pattern.

Assignees

• Caterpillar Inc

Inventors

• Kress Lee D
• Lawrence Rodney A
• Jenkins William

Classifications

• F02B2043/103

  Natural gas, e.g. methane or LNG used as a fuel · CPC title

• F01M2013/0038

  Layout of crankcase breathing systems · CPC title

• F01M13/0033 Primary

  Breather inlet-air filters · CPC title

• F02M31/10

  by hot liquids, e.g. lubricants {or cooling water} · CPC title

• F01M13/028

  of positive pressure · CPC title