Canister purge for turbo engine

• US 5,005,550 A
• Filed: 12/19/1989
• Issued: 04/09/1991
• Est. Priority Date: 12/19/1989
• Status: Expired due to Fees

• Current Assignee: Chrysler Corporation (Stellantis NV)
• Original Assignee: Chrysler Corporation (Stellantis NV)
• Inventors: Franks, Kerry D., Bugin, Marion Jr., Dawson, Gary D., Geiss, Richard O., Kerska, Donald H.
• Primary Examiner(s): ARGENBRIGHT, TONY MICHAEL
• Application Number:
  US07/452,433
• Time in Patent Office: 476 Days
• Field of Search: 123/518-520
• US Class Current: 123/520
• CPC Class Codes: F02M 25/089 Layout of the fuel vapour installation

Abstract

An improved fuel vapor purging system for a vehicle vapor storage canister associate with a positively charged engine such as a turbocharged or supercharged engine. An aspirator device is utilized to provide a pressure differential with respect to atmosphere so as to draw air through the canister for purging.

Claims

1. With a vehicle engine which does not generate vacuum in a intake manifold under some operative conditions and utilizing an air compressor, an improved fuel vapor purge system for a vapor storage canister of the type utilizing a vacuum pressure differential to draw air through the canister, comprising:

an air inlet to admit air to the canister;

an air and vapor outlet to discharge air and vapor from the canister;

an aspirator device including a housing having an inlet portion, an outlet portion, and a reduced dimension passage therebetween;

means connecting the aspirator'"'"'s inlet portion to the outlet region of the air compressor and the aspirator'"'"'s outlet portion to the inlet region of the air compressor so that pressurized air is passed through the reduced dimension passage;

the aspirator also having a purge passage connected to the air and vapor outlet of the canister and opening to the aspirator'"'"'s reduced dimension passage whereby compressed air flowing through the aspirator'"'"'s reduced dimension passage draws air through the canister so that fuel vapors are also drawn into the aspirator and then through the compressor and into the engine.

2. The improved purge system set forth in claim 1 in which a one way flow valve is positioned between the aspirator'"'"'s purge passage to only allow air flow from the canister to the aspirator and not in an opposite direction.

3. The improved purge system set forth in claim 1 in which a control valve means is positioned to selectively permit or prevent air and vapor flow discharge from the canister.

4. An improved automobile engine emission control system with a canister to temporarily store fuel vapors in a canister and means to subsequently purge the canister of the vapors by drawing atmospheric air through the canister and into the engine under the influence of a vacuum pressure, the engine being capable of being positively charged with air by a compressor during which operation no vacuum is generated by the engine, comprising:

an air inlet to admit air to the canister;

an air and vapor outlet to discharge air and vapor from the canister;

an aspirator device including a housing having an inlet portion, an outlet portion, and a reduced dimension passage therebetween;

means connecting the aspirator'"'"'s inlet portion to the outlet region of the air compressor and the aspirator'"'"'s outlet portion to the inlet region of the air compressor so that pressurized air is passed through the reduced dimension passage;

the aspirator also having a purge passage connected to the air and vapor outlet of the canister and opening to the aspirator'"'"'s reduced dimension passage whereby compressed air flowing through the aspirator'"'"'s reduced dimension passage draws air through the canister so that fuel vapors are also drawn into the aspirator and then through the compressor and into the engine.

5. The improved system set forth in claim 4 in which a one way flow valve is positioned between the aspirator'"'"'s purge passage to only allow air flow from the canister to the aspirator and not in an opposite direction.

6. The improved system set forth in claim 4 in which a control valve means is positioned to selectively permit or prevent air and vapor flow discharge from the canister.