EVAPORATION FUEL PURGE SYSTEM

• US 20160108864A1
• Filed: 10/08/2015
• Published: 04/21/2016
• Est. Priority Date: 10/17/2014
• Status: Active Grant

• Current Assignee: Hamanako Denso Company Limited (DENSO Corporation)
• Original Assignee: Hamanako Denso Company Limited (DENSO Corporation)
• Inventors: INOGUCHI, Tetsunori, TOCHIHARA, Hideya
• Granted Patent: US 9,765,733 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 25/0872 Details of the fuel vapour pipes or conduits
• CPC Class Codes: F02M 25/089 Layout of the fuel vapour installation
• CPC Class Codes: F02M 35/10222 Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission

Abstract

An evaporation fuel purge system includes: a fuel tank; a canister that absorbs and desorbs evaporation fuel emitted from the fuel tank; an intake passage for an internal combustion engine in which the evaporation fuel desorbed from the canister is mixed with fuel for combustion; a purge passage that connects the canister to the intake passage; an ejector device disposed in the purge passage; and a fluid drive device. The ejector device has a nozzle part that accelerates external fluid. The fluid drive device sends outside air corresponding to the external fluid to flow into the nozzle part.

Claims

1. An evaporation fuel purge system comprising:

a fuel tank that stores fuel;

a canister that absorbs evaporation fuel when evaporation fuel is emitted from the fuel tank, the canister being able to desorb the evaporation fuel;

an intake passage for an internal combustion engine in which the evaporation fuel desorbed from the canister is mixed with fuel for combustion;

a purge passage that connects the canister to the intake passage;

an ejector device disposed in the purge passage and having

a nozzle part that accelerates external fluid flowing into,

a suction part that draws the evaporation fuel from the canister by a drawing force produced by the external fluid ejected from the nozzle part, and

a diffuser part that emits a mixture of the external fluid ejected from the nozzle part and the evaporation fuel drawn from the suction part into the intake passage; and

a fluid drive device that sends outside air corresponding to the external fluid to flow into the nozzle part.

2. The evaporation fuel purge system according to claim 1, wherein the fluid drive device is able to send fluid in the purge passage to outside, the evaporation fuel purge system further comprising:

a valve device able to allow the evaporation fuel emitted from the diffuser part to flow into the intake passage from the purge passage, and able to prohibit fluid from flowing backward from the intake passage to the purge passage; and

an abnormality determining circuit to determine an abnormality in the purge passage in a state where the fluid drive device draws fluid of the purge passage to outside, wherein

the abnormality determining circuit detects a predetermined physical quantity relevant to a pressure change in a target passage including the purge passage, and determines an abnormality in the evaporation fuel purge system according to the predetermined physical quantity.

3. The evaporation fuel purge system according to claim 2 further comprising:

a subcanister that adsorbs evaporation fuel from the fluid of the purge passage drawn by the fluid drive device.

4. The evaporation fuel purge system according to claim 2, wherein

the valve device is disposed in a duct component which forms the intake passage, and is not disposed in a duct which forms the purge passage.

5. The evaporation fuel purge system according to claim 2, wherein

the predetermined physical quantity is an internal pressure of the fuel tank.

6. The evaporation fuel purge system according to claim 2, wherein

the predetermined physical quantity is at least one of power consumption, consumption current, consumption voltage and drive cycle of the fluid drive device.

7. The evaporation fuel purge system according to claim 2 further comprising:

a concentration detector disposed in the target passage including the purge passage to detect a concentration of the evaporation fuel, wherein

the abnormality determining circuit executes a determination to detect an abnormality based on the concentration of the evaporation fuel detected by the concentration detector.