Dual purpose doser spring
AssigneeFaurecia Emissions Control Technologies, USA, LLC
InventorsEdward Kinnaird, John Rohde, Atul Shinde, Tony Parrish
Life of this patent
Estimating the term…
Abstract
An injection assembly for a vehicle exhaust system includes a housing defining a fluid cavity, a doser mounted to the housing and configured to inject a fluid into the fluid cavity, and a valve to control flow of the fluid. The valve is moveable between an open position and a closed position. A resilient member is configured with a biasing force to bias the valve to the closed position. The biasing force is overcome when fluid is heated downstream of the valve and exceeds a predetermined pressure level to allow backflow into the fluid cavity.
Claims20
An injection assembly for a vehicle exhaust system comprising:
- a housing defining a fluid cavity;
- a doser mounted to the housing, the doser configured to inject a fluid into the fluid cavity;
- a valve to control flow of the fluid, the valve being moveable between an open position and a closed position;
- and
- a resilient member that is configured with a biasing force to bias the valve to the closed position, and wherein the biasing force is overcome when fluid is heated downstream of the valve and exceeds a predetermined pressure level to allow backflow into the fluid cavity.
A vehicle exhaust system comprising:
- an exhaust component defining an exhaust gas flow path that receives exhaust gases from an engine;
- an injection assembly configured to inject heated DEF into the exhaust gas flow path, wherein the injection assembly includes a single resilient member that is configured with a biasing force to bias an injection valve to a closed position, and wherein the biasing force is overcome when commanded by heated DEF that exceeds a predetermined pressure level to allow backflow;
- and
- a controller to control injection of the DEF.
A method for injecting DEF into an exhaust component defining an exhaust gas flow path that receives exhaust gases from an engine, the method comprising the steps of:
- injecting heated DEF into the exhaust gas flow path with an injection assembly that includes a single resilient member;
- biasing an injection valve to a closed position with the single resilient member via a biasing force;
- and
- overcoming the biasing force when heated DEF exceeds a predetermined pressure level to allow backflow.
Dependencies are inferred from the claim text.