FUEL EVAPORATIVE GAS TREATMENT DEVICE FOR FUEL TANK

• US 20160010599A1
• Filed: 06/16/2015
• Published: 01/14/2016
• Est. Priority Date: 07/09/2014
• Status: Active Grant

• Current Assignee: Kawasaki Motors Ltd (Kawasaki Heavy Industries Limited)
• Original Assignee: Kawasaki Jukogyo Kabushiki Kaisha (Kawasaki Heavy Industries Limited)
• Inventors: Tsubone, Toshiyuki, Yamamoto, Norimasa, Kato, Hiroshi, Yoshida, Naoto
• Granted Patent: US 9,695,783 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F02M 25/0809 Judging failure of purge control system
• CPC Class Codes: F02M 25/0836 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 Class Codes: F02M 25/0854 Details of the absorption canister
• CPC Class Codes: F02M 25/089 Layout of the fuel vapour installation

Abstract

A fuel evaporative gas treatment device for a fuel tank is used in a motorcycle including a combustion engine with a supercharger. The fuel evaporative gas treatment device includes a canister which contains an adsorbent for adsorbing fuel evaporative gas from the fuel tank, a communication passage which communicates between an air intake passage for the combustion engine and the canister, and a check valve provided on the communication passage. The check valve blocks fluid flow from the air intake passage to the canister and permits fluid flow from the canister to the air intake passage.

Claims

1. A fuel evaporative gas treatment device for a fuel tank, the fuel evaporative gas treatment device being used in a vehicle including a combustion engine with a supercharger, the fuel evaporative gas treatment device comprising:

a canister containing an adsorbent which adsorbs fuel evaporative gas from the fuel tank;

a communication passage configured to communicate between an air intake passage for the combustion engine and the canister; and

a check valve provided on the communication passage, the check valve being configured to block fluid flow from the air intake passage to the canister and permit fluid flow from the canister to the air intake passage.

2. The fuel evaporative gas treatment device as claimed in claim 1, wherein

the check valve includes:

an air intake side communication hole communicating with the air intake passage;

a canister side communication hole communicating with the canister;

a partition wall separating between the air intake side and the canister side communication holes, the partition wall being provided with a valve port configured to communicate between the air intake side and the canister side communication holes; and

a valve body configured to open and close the valve port, and

the valve body is movable between a seated position at which the valve port is closed and a non-seated position at which the valve port is opened, and moves from the air intake passage side to the canister side to close the valve port at the seated position.

3. The fuel evaporative gas treatment device as claimed in claim 2, further comprising a drive section configured to move the valve body on the basis of a control command from a vehicle controller.

4. The fuel evaporative gas treatment device as claimed in claim 3, further comprising a biasing body configured to bias the valve body in a direction toward the seated position, wherein

the drive section moves, when being energized, the valve body to the non-seated position against a biasing force of the biasing body.

5. The fuel evaporative gas treatment device as claimed in claim 4, wherein the valve port is located below the valve body in a state where the check valve is mounted on the vehicle.

6. The fuel evaporative gas treatment device as claimed in claim 3, further comprising:

an abnormality detecting section configured to detect an abnormality in the drive section; and

a pressure adjuster configured to suppress an increase in pressure within the air intake passage when the abnormality detecting section detects an abnormality in the drive section.

7. The fuel evaporative gas treatment device as claimed in claim 6, wherein

the pressure adjuster is a solenoid on-off valve disposed on the air intake passage and between the supercharger and the air intake side communication hole, and

when the abnormality detecting section detects an abnormality in the drive section, the solenoid on-off valve shifts in a direction in which the air intake passage is closed.

8. The fuel evaporative gas treatment device as claimed in claim 7, wherein the solenoid on-off valve is configured such that an opening degree thereof is adjustable by an operation of a driver in a state where the abnormality detecting section detects an abnormality in the drive section.

9. The fuel evaporative gas treatment device as claimed in claim 1, further comprising a fuel injection device provided on the air intake passage and at an upstream side of the check valve, the fuel injection device being configured to inject fuel into the air intake passage, wherein

when the check valve opens, the fuel injection device reduces an amount of the fuel injected.