×

Automotive diesel exhaust HC dosing valve for use with diesel particulate filter systems

  • US 8,347,605 B2
  • Filed: 06/07/2007
  • Issued: 01/08/2013
  • Est. Priority Date: 08/15/2005
  • Status: Expired due to Fees
First Claim
Patent Images

1. A dosing valve assembly for administering a reducing agent into an exhaust stream from an internal combustion engine upstream of a catalytic converter and a diesel particulate filter, comprising:

  • a control valve coupled to a source of reducing agent; and

    a fluid pressure operated delivery valve constructed and arranged for coupling directly to the exhaust stream at a location upstream of the catalytic converter and the diesel particulate filter, the delivery valve having structure movable from a closed position to an open position to enable a reducing agent to be administered into the exhaust stream, the delivery valve including an inlet communicating with an elongated conduit connecting the control valve and delivery valve for fluidly communicating the reducing agent from the control valve to the delivery valve,wherein the control valve is coupled to an electronic control unit that signals the control valve to move between an open and closed fluid flow condition in response to feedback of NOx emissions in the exhaust stream,wherein the delivery valve is a poppet valve having a longitudinal axis and comprising a housing;

    a movable valve plate disposed generally transversely with respect to the longitudinal axis and having an opening there-through, parallel to and spaced from the longitudinal axis, for the passage of reducing agent;

    an axially extending valve stem coupled to the valve plate and including a flared portion having a surface disposed at an acute angle with respect to the longitudinal axis, the surface of the flared portion mating with a valve seat surface disposed generally at the same angle as the surface of the flared portion; and

    a spring for normally biasing the valve plate such that the surface of the flared portion resides against the valve seat surface to prevent reducing agent flow from an outlet of the poppet valve, andwherein the spring has a force such that fluid pressure alone biases the valve plate against the force of the spring to such that the surface of the flared portion moves away from the valve seat surface to permit reducing agent flow from the outlet of the poppet valve.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×