Purge valve having permanent magnet armature
AssigneeSiemens VDO Automotive Corporation
InventorJohn Cook
Life of this patent
Estimating the term…
Abstract
A purge valve for an evaporative emission control system. The purge valve includes an actuator, a valve body, and a valve closure member disposed in the valve body. The actuator is disposed along a longitudinal axis, and includes an electromagnetic coil having a hollow core extending along the longitudinal axis, a stator disposed in the hollow core, and a permanent magnet armature disposed proximate the stator. The valve body is disposed proximate the actuator, and defines a flow passage extending along the longitudinal axis. When the coil is unenergized, the permanent magnet armature is magnetically attracted to the stator, and the valve closure member is spaced from the armature by a lost motion distance.
Claims20
A purge valve for an evaporative emission control system, comprising:
- a housing disposed along a longitudinal axis, the housing including a first wall defining a first chamber;
- an actuator disposed in the first chamber, the actuator including;
- a bobbin having a hollow core extending along the longitudinal axis;
- an electromagnetic coil wound on the bobbin;
- a stator disposed in the hollow core;
- and
- an armature disposed along the longitudinal axis proximate the stator, the armature being a permanent magnet;
- a valve body disposed proximate the housing, the valve body defining a first flow passage extending along the longitudinal axis;
- and
- a valve closure member disposed in the valve body, the valve closure member including a pin extended along the longitudinal axis, a distal end of the pin is spaced from the armature by a lost motion distance, the valve closure member forms a seal with a valve seat, and the permanent magnet armature is magnetically attracted to the stator when the coil is unenergized.
A purge valve for an evaporative emission control system, comprising:
- an actuator disposed along a longitudinal axis, the actuator including;
- an electromagnetic coil having a hollow core extending along the longitudinal axis;
- a stator disposed in the hollow core;
- and
- an armature disposed along the longitudinal axis proximate the stator, the armature being a permanent magnet;
- a valve body disposed proximate the actuator, the valve body defining a flow passage extending along the longitudinal axis;
- and
- a valve closure member disposed in the valve body, the valve closure member is spaced from the armature by a lost motion distance and the armature is magnetically attracted to the stator when the coil is unenergized.
A method of actuating a closure member in a purge valve for an evaporative emission control system, the purge valve including an actuator having an electromagnetic coil, a stator, and a permanent magnet armature, the purge valve including a valve body defining a flow passage and a valve closure member disposed in the valve body, the method comprising:
- energizing the electromagnetic coil;
- inducing a polarity in the stator, the polarity being the same as a polarity of a proximate portion of the armature;
- and
- repulsing the armature from the stator by a lost motion distance before the armature contacts the valve closure member.
A purge valve for an evaporative emission control system, comprising:
- a housing disposed along a longitudinal axis, the housing including a wall defining a chamber;
- an actuator disposed in the chamber, the actuator including;
- a bobbin having a hollow core extending along the longitudinal axis;
- an electromagnetic coil on the bobbin;
- a stator disposed in the hollow core;
- a strap completing an electromagnetic circuit with a first end and a second end of the stator;
- the strap having a plurality of protrusions contacting the housing wall to radially position the actuator in the housing;
- and
- an armature disposed along the longitudinal axis proximate the stator, the armature being a permanent magnet;
- a valve body proximate the housing, the valve body defining a flow passage;
- and
- a valve closure member disposed in the valve body.
A purge valve for a fuel system including an intake manifold of an internal combustion engine and a fuel tank in vapor communication with a fuel vapor collection canister, the purge valve comprising:
- an aperture defining a portion of a vapor flow path extending between first and second ports, the first port that communicates with the fuel vapor collection canister, and the second port that communicates with the intake manifold;
- a member being displaced between first and second configurations with respect to the aperture, the member in the first configuration occludes the aperture and vapor flow along the vapor flow path is substantially prevented, and the member in the second configuration is spaced from the aperture and vapor flow along the vapor flow path is permitted;
- and
- an actuator displacing the member between the first and second configurations, the actuator including:
- an armature including a permanent magnet;
- and
- a stator including a winding surrounding at least a portion of the permanent magnet.
Dependencies are inferred from the claim text.