Abnormality sensing device for evaporation fuel purge system

Patent metadata

Field	Value
Publication number	US-10294895-B2
Application number	US-201514792903-A
Country	US
Kind code	B2
Filing date	Jul 7, 2015
Priority date	Jul 15, 2014
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

An abnormality sensing device for an evaporation fuel purge system is equipped with a purge passage that connects a canister to an intake passage of an internal combustion engine, a purge pump, a purge control valve, and a valve component that closes and opens the purge passage at a target passage including at least a first purge passage defined between the purge control valve and the intake passage. An abnormality determining portion detects a physical quantity relevant to a pressure change in the target passage in a determination possible state where the purge control valve allows the evaporation fuel to flow through the first purge passage and where the valve component prohibits the evaporation fuel from being supplied to the intake passage.

First claim

What is claimed is:

1. An abnormality sensing device for an evaporation fuel purge system comprising:
a fuel tank storing fuel;
a canister that adsorbs evaporation fuel generated in the fuel tank and that desorbs the evaporation fuel;
an intake passage of an internal combustion engine in which the evaporation fuel desorbed from the canister is mixed with fuel for combustion to be combusted;
a purge passage that connects the canister to the intake passage of the internal combustion engine;
a purge pump that pumps the evaporation fuel from the canister to the intake passage of the internal combustion engine;
a purge control valve disposed in the purge passage to control a flow of the evaporation fuel pumped by the purge pump to flow through the purge passage;
a valve component that closes and opens the purge passage to control the evaporation fuel to flow into the intake passage of the internal combustion engine at a target passage of the purge passage, the target passage including at least a first passage defined between the purge control valve and the intake passage of the internal combustion engine; and
an abnormality determining portion that determines whether there is an abnormality in the evaporation fuel purge system in a state where the evaporation fuel is pumped by the purge pump toward the intake passage of the internal combustion engine, wherein
the abnormality determining portion is in a determination possible state when the evaporation fuel is pumped toward the intake passage of the internal combustion engine by the purge pump, when the purge control valve allows the evaporation fuel to flow through the first passage, and when the valve component prohibits the evaporation fuel from being supplied to the intake passage of the internal combustion engine,
the abnormality determining portion detects a predetermined physical quantity relevant to a pressure change in the target passage in the determination possible state, and determines whether there is an abnormality in the evaporation fuel purge system according to the predetermined physical quantity,
the purge passage comprising a second passage, the purge pump and the purge control valve being connected with each other by the second passage which is defined between the purge pump and the purge control valve, the purge passage further comprising a third passage, wherein an end of piping which defines the third passage is connected to an outflow part of the canister and the other end of the piping which defines the third passage is connected to an inflow part of the purge pump so that the third passage is defined between the canister and the inflow part of the purge pump,
the first passage is defined between an outflow part of the purge control valve and an inflow part of the valve component,
the evaporation fuel purge system further comprises a pressure sensor configured to detect the pressure in the first passage, and
the predetermined physical quantity is a consumption current or consumption voltage of the purge pump.

2. The abnormality sensing device according to claim 1 , wherein
the predetermined physical quantity also includes a pressure detected in the first passage.

3. The abnormality sensing device according to claim 1 , wherein
the purge control valve has a valve object that is configured to operate to close the purge passage when a first purge passage adjacent to the valve component has a negative pressure by operation of the internal combustion engine.

4. The abnormality sensing device according to claim 1 , wherein
the canister, the purge pump, and the purge control valve are connected in order.

5. The abnormality sensing device according to claim 1 , wherein
an end of piping which defines a second purge passage is connected to an outflow part of the purge pump, and the other end of the piping which defines the second purge passage is connected to an inflow part of the purge control valve.

6. The abnormality sensing device according to claim 1 , wherein
the valve component is controlled to open or close the purge passage by a signal output from the abnormality determining portion.

7. The abnormality sensing device according to claim 1 , wherein the pressure sensor configured to detect the pressure in a first purge passage is located between the purge control valve and the valve component.

8. The abnormality sensing device according to claim 1 , further comprising:
a cylindrical connector that has a cylindrical shape extending from the duct component which defines the intake passage of the internal combustion engine, wherein
the valve component is disposed inside of the cylindrical connector that is connected to a duct which defines the target passage, and is able to open and close a passage in the cylindrical connector.

9. The abnormality sensing device according to claim 1 , the valve component is located at an intersection of the first passage and the intake passage.

10. An abnormality sensing device for an evaporation fuel purge system comprising:
a fuel tank storing fuel;
a canister that adsorbs evaporation fuel generated in the fuel tank and that desorbs the evaporation fuel;
an intake passage of an internal combustion engine in which the evaporation fuel desorbed from the canister is mixed with fuel for combustion to be combusted;
a purge passage that connects the canister to the intake passage of the internal combustion engine;
a purge pump that pumps the evaporation fuel from the canister to the intake passage of the internal combustion engine;
a purge control valve disposed in the purge passage to control a flow of the evaporation fuel pumped by the purge pump to flow through the purge passage;
a valve component that closes and opens the purge passage to control the evaporation fuel to flow into the intake passage of the internal combustion engine at a target passage of the purge passage; and
an abnormality determining portion that determines whether there is an abnormality in the evaporation fuel purge system in a state where the evaporation fuel is pumped by the purge pump toward the intake passage of the internal combustion engine, wherein
the target passage includes
a first passage defined between the purge control valve and the intake passage of the internal combustion engine, and
a second passage defined between the purge pump and the purge control valve,

the abnormality determining portion is in a determination possible state when the evaporation fuel is pumped toward the intake passage of the internal combustion engine by the purge pump, when the purge control valve allows the evaporation fuel to flow through the first passage, and when the valve component prohibits the evaporation fuel from being supplied to the intake passage of the internal combustion engine,
the abnormality determining portion detects a predetermined physical quantity relevant to a pressure change in the target passage in the determination possible state, and determines whether there is an abnormality in the evaporation fuel purge system according to the predetermined physical quantity,
when the abnormality determining portion determines that the evaporation fuel purge system is abnormal in the determination possible state, as a first passage prohibition state, the purge pump pumps the evaporation fuel toward the intake passage of the internal combustion engine, and the purge control valve controls the evaporation fuel not to flow through the first passage,
in the first passage prohibition state, the abnormality determining portion detects a pressure change in the second passage, and determines whether there is an abnormality in the second passage according to the pressure change, and
the abnormality determining

Assignees

• Hamanakodenso Co Ltd
• Denso Corp

Inventors

• Shirai Kosuke

Classifications

• F02M35/10222

  Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission · CPC title

• F02M25/0809 Primary

  Judging failure of purge control system · CPC title

• F02M25/089

  Layout of the fuel vapour installation · CPC title

• F02M25/0818

  having means for pressurising the evaporative emission space · CPC title

• F02M25/0836

  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 title