Thermal management system for aftertreatment system

Patent metadata

Field	Value
Publication number	US-9784170-B2
Application number	US-201514854095-A
Country	US
Kind code	B2
Filing date	Sep 15, 2015
Priority date	Sep 15, 2015
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A thermal management system for an aftertreatment system includes an air pump and a compressed air rail. The compressed air rail is fluidly connected with the air pump. The thermal management system further includes a first valve located between the compressed air rail and an exhaust outlet pathway. The first valve is configured to selective supply air to the aftertreatment system of the engine. The thermal management system further includes a heater located between the compressed air rail and the first valve. The heater is configured to heat the air before supplying air to the aftertreatment system of the engine.

First claim

What is claimed is:

1. A thermal management system for an aftertreatment system of an engine, the thermal management system comprising:
an air pump;
a compressed air rail fluidly connected with the air pump;
a first valve located between the compressed air rail and an exhaust outlet pathway, and configured to selectively supply air to the aftertreatment system of the engine; and
a heater located between the compressed air rail and the first valve, and configured to heat the air before supplying air to the aftertreatment system of the engine.

2. The thermal management system of claim 1 , further comprising a second valve located between the compressed air rail and an air intake pathway of the engine.

3. The thermal management system of claim 1 further comprising a relief valve connected with the compressed air rail.

4. The thermal management system of claim 1 , wherein the compressed air rail comprises a double-layered housing with an outer casing and an inner casing.

5. The thermal management system of claim 4 , wherein the compressed air rail further comprises a coolant passage located between the outer casing and the inner casing.

6. The thermal management system of claim 1 , wherein the first valve is a two-way two-position valve.

7. The thermal management system of claim 2 , wherein the second valve is a two-way two-position valve.

8. An engine system comprising:
an engine;
an air intake pathway to supply air to the engine;
an exhaust outlet pathway to route exhaust gases out from the engine;
an aftertreatment system to treat the exhaust gases; and
a thermal management system for the aftertreatment system, the thermal management system including:
an air pump;
a compressed air rail fluidly connected with the air pump;
a first valve located between the compressed air rail and the exhaust outlet pathway, and configured to selectively supply air to the aftertreatment system of the engine; and
a heater located between the compressed air rail and the first valve, and configured to heat the air before supplying air to the aftertreatment system of the engine.

9. The engine system of claim 8 , wherein the thermal management system further comprising a second valve located between the compressed air rail and an air intake pathway of the engine.

10. The engine system of claim 8 , wherein the thermal management system further comprising a relief valve connected with the compressed air rail.

11. The engine system of claim 8 , wherein the compressed air rail comprises a double-layered housing with an outer casing and an inner casing.

12. The engine system of claim 11 , wherein the compressed air rail comprises a coolant passage located between the outer casing and the inner casing.

13. The engine system of claim 8 , wherein the first valve is a two-way two-position valve.

14. The engine system of claim 8 , wherein the second valve is a two-way two-position valve.

Assignees

• Caterpillar Inc

Inventors

• Ge Xinyu
• Qi Yongli

Classifications

• F01N13/143 Primary

  with air filling the space between both walls · CPC title

• Y02T10/40

  Engine management systems · CPC title

• F01N9/00

  Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00) · CPC title

• F01N3/306

  Preheating additional air · CPC title

• F01N2900/1804

  Properties of secondary air added directly to the exhaust · CPC title