Linear electric EGR valve with damped movement
AssigneeSiemens Automotive Corporation
InventorRussell Modien
Life of this patent
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Abstract
An automotive emission control valve, such as an EGR valve, has a solenoid for operating a valve element. The solenoid has a stator and an armature. The armature is guided within a sleeve and includes a damping ring disposed to act between the armature and the sleeve to damp motion of the armature within the sleeve.
Claims10
An emission control valve for controlling flow of gases with respect to combustion chamber space of an internal combustion engine comprising:
- a valve body comprising a passageway having an inlet port for receiving gases and an outlet port for delivering gases to the combustion chamber space,
- a valve element that is selectively positioned to selectively restrict the passage,
- and a mechanism for selectively positioning the valve element comprising a solenoid having an electromagnet coil, a stator that is associated with the coil and that has a magnetic circuit comprising an air gap for conducting magnetic flux generated in the stator when electric current flows in the coil, and an armature that is disposed in the air gap to be displaced along an imaginary centerline by the magnetic flux and that is guided within a sleeve, including
- a damping ring disposed to act between the armature and the sleeve to damp motion of the armature within the sleeve.
A method of operating an emission control valve for controlling flow of gases with respect to combustion chamber space of an internal combustion engine, the valve comprising a valve body comprising a passageway having an inlet port for receiving gases and an outlet port for delivering gases to the combustion chamber space, a valve element that is selectively positioned to selectively restrict the passage, and a mechanism for selectively positioning the valve element comprising a solenoid having an electromagnet coil, a stator that is associated with the coil and that has a magnetic circuit comprising an air gap for conducting magnetic flux generated in the stator when electric current flows in the coil, and an armature that is disposed in the air gap to be displaced along an imaginary centerline by the magnetic flux and that is guided within a sleeve, the method comprising:
- damping armature motion by a damping ring disposed to act between the armature and the sleeve to damp motion of the armature within the sleeve.
Dependencies are inferred from the claim text.