On-board fuel vapor recovery system having improved canister purging
An on-board fuel vapor recovery system is described for a fuel system of an internal combustion engine of an automotive vehicle comprising a canister in which volatile fuel vapors are collected, a canister purge solenoid (CPS) valve comprising an inlet port, an outlet port, a valve member controlling flow between the inlet port and the outlet port, resilient bias means resiliently biasing the valve member to close the CPS valve to flow between the inlet port and the outlet port, and a solenoid for operating the valve member, means placing the inlet port in communication with the canister, means placing the outlet port in communication with an intake manifold of the internal combustion engine, means placing the solenoid under the control of an electrical control system that controls the purging of the canister to the intake manifold, the CPS valve's solenoid comprising a relatively magnetically permeable stator, the valve member comprising a relatively magnetically permeable armature, the stator and the armature being disposed to have confronting faces defining an air gap across which the stator exerts magnetic attraction force on the armature for operating the valve member against opposite force of the resilient bias means to open the CPS valve to flow between the inlet port and the outlet port when the solenoid is energized by electric current from the electrical control system, the intensity of the magnetic force and hence the extent to which the valve member opens the CPS valve to flow between the inlet port and the outlet port being related to the intensity of the electric current from the electrical control system, in that the confronting faces of the stator and the armature are shaped to congruently complement each other with one comprising an intrusion that congruently complements a protrusion on the other, and in that the resilient bias means is disposed other than between the confronting faces.
- Assignee:
- IMS; EDB-93-120632
- Patent Number(s):
- US 5237980; A
- Application Number:
- PPN: US 7-984406
- OSTI ID:
- 6271012
- Resource Relation:
- Patent File Date: 2 Dec 1992
- Country of Publication:
- United States
- Language:
- English
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