Fuel evaporation gas treatment system

Patent metadata

Field	Value
Publication number	US-11639702-B2
Application number	US-202117643865-A
Country	US
Kind code	B2
Filing date	Dec 13, 2021
Priority date	Jun 30, 2021
Publication date	May 2, 2023
Grant date	May 2, 2023

Abstract

Disclosed is a fuel evaporation gas treatment system for a vehicle, which includes a sub-purge system configured such that a fuel evaporation gas adsorbed in a canister is recovered into a fuel tank, the sub-purge system including a recovery port formed in the canister, a recovery line connected to the recovery port, an ejector provided to receive fuel delivered by a fuel pump, to suck the fuel evaporation gas from the canister through the recovery line and the recovery port upon generation of negative pressure, and to discharge the fuel evaporation gas to the fuel tank, a driving fluid hose connecting the discharge port of the fuel pump to the driving inlet of the ejector to supply the fuel to the ejector, and a recovery control valve for opening and closing a fuel passage so that the fuel is selectively supplied to the ejector.

First claim

What is claimed is:

1. A fuel evaporation gas treatment system comprising a sub-purge system configured such that a fuel evaporation gas adsorbed in a canister is recovered into a fuel tank,
wherein the sub-purge system comprises:
a recovery port formed in the canister;
a fuel pump plate mounted over an opening in the fuel tank, the fuel pump plate having a first side and a second side opposite the first side;
a recovery line connected to the recovery port;
an ejector positioned on the first side of the fuel pump plate, wherein the ejector is provided to receive a fuel delivered by a fuel pump as a driving fluid, to suck a fuel evaporation gas collected in the canister through the recovery line and the recovery port when negative pressure is generated by the driving fluid, and to discharge the fuel evaporation gas to the fuel tank;
a driving fluid hose configured to connect a discharge port of the fuel pump to a driving inlet of the ejector to supply the fuel delivered by the fuel pump as the driving fluid to the ejector;
a pump control unit; and
a recovery control valve positioned on the second side of the fuel pump plate, wherein the recovery control valve is configured such that the driving fluid delivered along the driving fluid hose by the fuel pump is selectively supplied to an inner passage of the ejector in response to a control signal of the pump control unit,
wherein the pump control unit is configured to control operation of the recovery control valve so that the fuel delivered by the fuel pump is supplied to the ejector via the negative pressure of the ejector when a turbocharger is operated and the fuel is not supplied to the ejector and negative pressure is not generated by the ejector when the turbocharger is not operated.

2. The fuel evaporation gas treatment system of claim 1 , wherein a fuel hose for supply of the fuel to an engine and the driving fluid hose are connected to the discharge port of the fuel pump, so a portion of the fuel discharged through the discharge port of the fuel pump is supplied to the engine through the fuel hose, and a remainder of the discharged fuel is supplied to the ejector through the driving fluid hose.

3. The fuel evaporation gas treatment system of claim 2 , wherein:
an inlet of a 3-way connector is connected to the discharge port of the fuel pump, the fuel hose is connected to one of two outlets of the 3-way connector, and the driving fluid hose is connected to a remaining one of the two outlets of the 3-way connector.

4. The fuel evaporation gas treatment system of claim 1 , wherein the ejector is installed in the fuel tank.

5. The fuel evaporation gas treatment system of claim 1 , wherein the pump control unit is configured to control a driving speed of the fuel pump so that a predetermined rate at which fuel is to be supplied to the ejector is further supplied, in addition to a fuel flow rate required for an engine when the turbocharger is operated.

6. The fuel evaporation gas treatment system of claim 1 , wherein a suction inlet of the ejector is connected to the recovery line via a suction hose.

7. The fuel evaporation gas treatment system of claim 6 , wherein the suction hose is provided with a check valve to prevent fuel supplied to the ejector by the fuel pump from flowing to the canister through the suction hose and the recovery line and to enable only the fuel evaporation gas in the canister to be sucked into the ejector.

8. The fuel evaporation gas treatment system of claim 7 , wherein a suction port is installed on an outer surface of a fuel pump plate, which is mounted over an opening in the fuel tank, so the recovery line is connected to the suction port and the check valve is installed between the suction port and the suction hose.

9. The fuel evaporation gas treatment system of claim 1 , wherein the recovery control valve comprises:
a solenoid;
a guide passage portion installed to pass through the fuel pump plate;
a guide pin fixedly installed in the guide passage portion;
a plunger joined to the guide pin in the guide passage portion to be movable back and forth, and configured to move back and forth by controlling current supply to the solenoid and interruption of the current supply;
a valve body installed at an end of the plunger inserted into the ejector to open and close the fuel passage of the ejector when the plunger moves back and forth; and
a return spring installed to elastically support the plunger and configured to return the plunger moved by the solenoid.

10. The fuel evaporation gas treatment system of claim 9 , wherein a connection passage portion is formed to extend in a predetermined direction on a housing of the ejector,
the guide pin and the plunger are disposed inside the guide passage portion and the connection passage portion in a state in which the guide passage portion and the connection passage portion of the ejector are connected, and
an end of the plunger is inserted into the housing of the ejector.

11. The fuel evaporation gas treatment system of claim 9 , wherein the solenoid is installed in the pump control unit provided to the fuel pump plate to control driving of the fuel pump, and is provided such that current supply and interruption of the current supply are controlled by the pump control unit.

12. The fuel evaporation gas treatment system of claim 11 , wherein the pump control unit is configured to control a driving speed of the fuel pump so that a predetermined rate at which fuel is to be supplied to the ejector is further supplied, in addition to a fuel flow rate required for an engine when the turbocharger is operated.

13. A fuel evaporation gas treatment system comprising a sub-purge system configured such that a fuel evaporation gas adsorbed in a canister is recovered into a fuel tank,
wherein the sub-purge system comprises:
a recovery port formed in the canister;
a fuel pump plate mounted over an opening in the fuel tank, the fuel pump plate having a first side and a second side opposite the first side;
a recovery line connected to the recovery port;
an ejector positioned on the first side of the fuel pump plate, wherein the ejector is provided to receive a fuel delivered by a fuel pump as a driving fluid, to suck a fuel evaporation gas collected in the canister through the recovery line and the recovery port when negative pressure is generated by the driving fluid, and to discharge the fuel evaporation gas to the fuel tank;
a driving fluid hose configured to connect a discharge port of the fuel pump to a driving inlet of the ejector to supply the fuel delivered by the fuel pump as the driving fluid to the ejector; and
a recovery control valve positioned on the second side of the fuel pump plate, wherein the recovery control valve is configured to open and close the driving inlet and an inner passage of the ejector using a valve body integrally installed to a plunger by moving the plunger back and forth in response to a control signal of a pump control unit,
wherein the pump control unit is configured to control operation of the recovery control valve so that the fuel delivered by the fuel pump is supplied to the ejector via the negative pressure of the ejector when a turbocharger is operated and the fuel is not supplied to the ejector and negative pressure is not generated by the ejector when the turbocharger is not operated.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Kim Chang Han
• Lim Jun Sik
• Choi Seung Hoon
• Kang Gil Eon

Classifications

• F02M2025/0845

  Electromagnetic valves · CPC title

• F02M25/0872

  Details of the fuel vapour pipes or conduits · CPC title

• F02D41/3082

  Control of electrical fuel pumps · CPC title

• F02M25/089 Primary

  Layout of the fuel vapour installation · CPC title

• F02M25/0836 Primary

  Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold · CPC title