Evaporated fuel processing apparatus

Patent metadata

Field	Value
Publication number	US-2016377003-A1
Application number	US-201615185111-A
Country	US
Kind code	A1
Filing date	Jun 17, 2016
Priority date	Jun 26, 2015
Publication date	Dec 29, 2016
Grant date	—

Abstract

An evaporated fuel processing apparatus includes: a fuel tank that stores fuel supplied to an engine; a purge pipe that communicates an upper space in the fuel tank with an inlet system of the engine; an electromagnetic valve that is mounted on the purge pipe and that opens and closes the purge pipe; an air-fuel ratio detecting module for detecting an air-fuel ratio of an air-fuel mixture burned in the engine in accordance with an oxygen concentration in exhaust gas emitted from the engine; and a controlling module for controlling open and close of the electromagnetic valve based on an operating state of the engine. The controller controls at least one of a valve-open cycle, a valve-open period, and a valve-open amount of the electromagnetic valve based on a variation value of the air-fuel ratio detected by the air-fuel ratio detecting module when opening the electromagnetic valve.

First claim

1 . An evaporated fuel processing apparatus comprising:
a fuel tank that stores fuel to be supplied to an engine; a purge pipe that communicates an upper space in the fuel tank with an inlet system of the engine; an electromagnetic valve that is mounted on the purge pipe and that opens and closes the purge pipe; an air-fuel ratio detecting module for detecting an air-fuel ratio of an air-fuel mixture burned in the engine in accordance with an oxygen concentration in exhaust gas emitted from the engine; and a controlling module for controlling open and close of the electromagnetic valve based on an operating state of the engine, wherein the controlling module controls at least one of a valve-open cycle, a valve-open period, and a valve-open amount of the electromagnetic valve based on a variation value of the air-fuel ratio detected by the air-fuel ratio detecting module, when opening the electromagnetic valve.

2 . The evaporated fuel processing apparatus according to claim 1 , wherein the controlling module prohibits the electromagnetic valve from opening when the variation value of the air-fuel ratio is not lower than a predetermined first value.

3 . The evaporated fuel processing apparatus according to claim 1 , wherein in the case where the variation value of the air-fuel ratio is lower than the first predetermined value, the controlling module shortens the valve-open cycle of the electromagnetic valve compared with a case where the variation value of the air-fuel ratio is not lower than the first predetermined value.

4 . The evaporated fuel processing apparatus according to claim 2 , wherein in the case where the variation value of the air-fuel ratio is lower than the first predetermined value, the controlling module shortens the valve-open cycle of the electromagnetic valve compared with a case where the variation value of the air-fuel ratio is not lower than the first predetermined value.

5 . The evaporated fuel processing apparatus according to claim 1 , further comprising:
a tank internal pressure detecting module for detecting a pressure in the fuel tank wherein the controlling module sets the valve-open period of the electromagnetic valve based on a pressure in the fuel tank detected by the tank internal pressure detecting module and a flow rate of evaporated fuel flowing in the purge pipe.

6 . The evaporated fuel processing apparatus according to claim 2 , further comprising:
a tank internal pressure detecting module for detecting a pressure in the fuel tank wherein the controlling module sets the valve-open period of the electromagnetic valve based on a pressure in the fuel tank detected by the tank internal pressure detecting module and a flow rate of evaporated fuel flowing in the purge pipe.

7 . The evaporated fuel processing apparatus according to claim 1 , further comprising:
a canister that is mounted on the purge pipe on a downstream side of the electromagnetic valve and that is capable of adsorbing the evaporated fuel, and a purge solenoid valve that is mounted on the purge pipe on a downstream side of the canister and that opens and closes the purge pipe, wherein the controlling module prohibits the electromagnetic valve from opening in a case where the purge solenoid valve is closed.

8 . The evaporated fuel processing apparatus according to claim 2 , further comprising:
a canister that is mounted on the purge pipe on a downstream side of the electromagnetic valve and that is capable of adsorbing the evaporated fuel, and a purge solenoid valve that is mounted on the purge pipe on a downstream side of the canister and that opens and closes the purge pipe, wherein the controlling module prohibits the electromagnetic valve from opening in a case where the purge solenoid valve is closed.

9 . The evaporated fuel processing apparatus according to claim 1 , wherein the controlling module prohibits the electromagnetic valve from opening when a pressure in the fuel tank is lower than a predetermined pressure.

10 . The evaporated fuel processing apparatus according to claim 2 , wherein the controlling module prohibits the electromagnetic valve from opening when a pressure in the fuel tank is lower than a predetermined pressure.

11 . The evaporated fuel processing apparatus according to claim 9 , wherein the controlling module prohibits the electromagnetic valve from opening when a variation value of the pressure in the fuel tank is not lower than a second predetermined value.

12 . The evaporated fuel processing apparatus according to claim 10 , wherein the controlling module prohibits the electromagnetic valve from opening when a variation value of the pressure in the fuel tank is not lower than a second predetermined value.

13 . The evaporated fuel processing apparatus according to claim 1 , further comprising:
a concentration detecting module for detecting a concentration of the evaporated fuel in the fuel tank, wherein the controlling module regulates at least one of the valve-open cycle, the valve-open period, and the valve-open amount of the electromagnetic valve considering the concentration of the evaporated fuel detected by the concentration detecting module.

14 . The evaporated fuel processing apparatus according to claim 2 , further comprising:
a concentration detecting module for detecting a concentration of the evaporated fuel in the fuel tank, wherein the controlling module regulates at least one of the valve-open cycle, the valve-open period, and the valve-open amount of the electromagnetic valve considering the concentration of the evaporated fuel detected by the concentration detecting module.

15 . An evaporated fuel processing apparatus comprising:
a fuel tank that stores fuel supplied to an engine; a purge pipe that communicates an upper space in the fuel tank with an inlet system of the engine; an electromagnetic valve that is mounted on the purge pipe and that opens and closes the purge pipe; an air-fuel ratio detector configured to detect an air-fuel ratio of an air-fuel mixture burned in the engine in accordance with an oxygen concentration in exhaust gas emitted from the engine; and circuitry configured to control open and close of the electromagnetic valve based on an operating state of the engine, wherein the circuitry controls at least one of a valve-open cycle, a valve-open period, and a valve-open amount of the electromagnetic valve based on a variation value of the air-fuel ratio detected by the air-fuel ratio detector when opening the electromagnetic valve.

Assignees

• Fuji Heavy Ind Ltd

Inventors

• Kuwabara Kosuke
• Ito Kengo
• Okazaki Kazuya

Classifications

• F02M25/089

  Layout of the fuel vapour installation · CPC title

• F02M25/0854

  Details of the absorption canister · CPC title

• F02M2025/0845

  Electromagnetic valves · CPC title

• F02D41/1454

  the characteristics being an oxygen content or concentration or the air-fuel ratio · 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