# US 12,000,325 B2 · Coolant system for an engine

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- Number: US 12,000,325 B2
- Document ID: US12000325B2
- Status: Granted
- Kind: B2
- Application number: 17/877,065
- Filed: 2022-07-29
- Published: 2024-02-01
- Granted: 2024-06-04
- Earliest claimed: 2022-07-29
- Assignees: CNH Industrial America LLC
- Applicants: CNH Industrial America LLC
- Inventors: Marc Hansen; Daniel Morey
- Web page: https://patentgrep.com/patent/US12000325B2

## CPC

- F01P 11/028: {Deaeration devices}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F01P 3/12: Arrangements for cooling other engine or machine parts
- F01P 3/20: Cooling circuits not specific to a single part of engine or machine (F01P3/22 takes precedence)
- F01P 11/029: {Expansion reservoirs}
- F01N 2260/024: using a liquid
- F01N 2590/08: for heavy duty applications, e.g. trucks, buses, tractors, locomotives
- F01N 2610/02: the substance being ammonia or urea
- F01N 2610/11: the substance or part of the dosing system being cooled
- F01N 2610/1406: Storage means for substances, e.g. tanks or reservoirs
- F01N 2610/1453: Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- Y02T 10/12: Improving ICE efficiencies
- F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28)
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Systems and apparatuses include a de-aeration tank for an engine system. The de-aeration tank including a single internal volume defined by walls, a diesel exhaust fluid (DEF) doser port configured to communicate coolant with a DEF doser module, and engine coolant ports configured to communicate coolant with an engine coolant system.

## Claims

### Claim 1

A de-aeration tank for an engine system including an engine and an engine coolant system, the engine coolant system including a radiator, a radiator supply line extending from the engine to the radiator, and a radiator return line extending from the radiator to the engine, the de-aeration tank comprising:
walls defining a single internal volume;
a diesel exhaust fluid (DEF) doser port configured to fluidly couple with a DEF doser to facilitate a first flow of coolant therebetween;
one or more engine coolant ports configured to fluidly couple with the radiator return line of the engine coolant system to facilitate a second flow of the coolant to the radiator return line; and
one or more vent inlets configured to fluidly couple with at least one of (a) the radiator, (b) the radiator supply line, or (c) the engine to facilitate a third flow of entrained air within the coolant into the single internal volume.

### Claim 2 (depends on 1)

The de-aeration tank of claim 1, further comprising a baffle positioned within the single internal volume.

### Claim 3 (depends on 2)

The de-aeration tank of claim 2, wherein the baffle is positioned between the DEF doser port and the one or more engine coolant ports, and wherein the DEF doser port and the one or more engine coolant ports are position along a bottom wall of the walls.

### Claim 4 (depends on 1)

The de-aeration tank of claim 1, wherein the DEF doser port is positioned on a bottom wall of the walls.

### Claim 5 (depends on 1)

The de-aeration tank of claim 1, wherein the single internal volume defines a volume between seven liters and fifteen liters, and wherein the de-aeration tank is not a separate component from a coolant overflow tank.

### Claim 6 (depends on 1)

The de-aeration tank of claim 1, wherein the DEF doser port is in fluid communication with the engine coolant ports via the single internal volume.

### Claim 7

A system comprising:
an engine;
an engine coolant system including a radiator, a radiator supply line extending from the engine to the radiator, and a radiator return line extending from the radiator to the engine;
an exhaust gas aftertreatment system receiving exhaust gases from the engine and including a selective catalytic reduction (SCR) system, a diesel exhaust fluid (DEF) tank, and a DEF doser receiving DEF from the DEF tank and injecting the DEF into the SCR system; and
a de-aeration tank fluidly coupled to the engine, the DEF doser, and at least one of the radiator, the radiator supply line, or the radiator return line of the engine coolant system, the de-aeration tank including:
walls defining an internal volume;
one or more ports in fluid communication with the engine coolant system;
a DEF doser port in fluid communication with the DEF doser; and
an engine de-aeration port in fluid communication with the engine.

### Claim 8 (depends on 7)

The system of claim 7, wherein the de-aeration tank includes a rigid cover, and wherein a component of the exhaust after treatment system is mounted to the rigid cover.

### Claim 9 (depends on 7)

The system of claim 7, wherein when the engine is running, coolant flows from the DEF doser to the de-aeration tank via the DEF doser port, and wherein when the engine is shut down, coolant flows from the de-aeration tank via the DEF doser port to the DEF doser.

### Claim 10 (depends on 7)

The system of claim 7, further comprising frame members extending vertically upward on opposing sides of the engine such that the de-aeration tank is positioned vertically above the engine and the DEF doser.

### Claim 11 (depends on 7)

The system of claim 7, wherein the de-aeration tank includes a baffle positioned within the internal volume.

### Claim 12 (depends on 11)

The system of claim 11, wherein the baffle is positioned between the DEF doser port and at least one of the one or more ports.

### Claim 13 (depends on 7)

The system of claim 7, further comprising a valve positioned between (a) the engine and (b) the DEF tank and the DEF doser, and wherein the valve is configured to selectively divert coolant received from the engine to the DEF tank or the DEF doser.

### Claim 14 (depends on 7)

The system of claim 7, wherein the one or more ports include at least one of (a) a coolant return port fluidly coupled to the radiator return line or (b) a coolant system de-aeration port fluidly coupled to at least one of (i) the radiator or (ii) the radiator supply line.

### Claim 15 (depends on 14)

The system of claim 14, wherein the one or more ports include (a) the coolant return port and (b) the de-aeration port.

### Claim 16 (depends on 15)

The system of claim 15, wherein the de-aeration port is fluidly coupled to the radiator.

### Claim 17 (depends on 15)

The system of claim 15, wherein the de-aeration port is fluidly coupled to the radiator supply line.

### Claim 18 (depends on 14)

The system of claim 14, wherein the one or more ports include the coolant return port, and wherein the coolant return port and the DEF doser port are positioned along a bottom wall of the de-aeration tank.

### Claim 19 (depends on 18)

The system of claim 18, wherein the de-aeration tank includes a baffle positioned between the coolant return port and the DEF doser port.

### Claim 20 (depends on 7)

The system of claim 7, wherein the system does not include a coolant overflow tank such that the de-aeration tank is not separate from such a coolant overflow tank.