Thermal management of urea dosing components in an engine exhaust after-treatment system
US8122710B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2008 |
| Grant date | Feb 28, 2012 |
| Priority date | — |
| Expiry date | Aug 4, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Dosing components (22, 24, 32) in an engine exhaust after-treatment system (18) that includes an SCR catalyst (20) are thermally managed by flowing engine coolant through a coolant passage in a urea injector (22) that injects aqueous urea into the after-treatment system, controlling a three-way valve (60) to selectively direct coolant flow leaving the urea injector to a first branch that is in heat exchange relationship with a tank (24) that holds a supply of aqueous urea and a supply pump module (32) that pumps aqueous urea from the tank to the urea injector, and a second branch that is not in heat exchange relationship with either the tank or the supply pump, and returning coolant from the branches to the engine cooling system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.