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Fuel vapor treatment apparatus

A technology for fuel vapor and processing equipment, which is applied in the direction of adding non-fuel substances to mechanical equipment and fuel, charging systems, etc., and can solve the problems of reduced calculation accuracy of fuel vapor concentration, etc.

Inactive Publication Date: 2008-07-30
DENSO CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a sufficiently large detection gain G cannot be ensured in this way, the pressure difference ΔP Gas Relative pressure difference ΔP Air The relative detection accuracy, and extended to the reduction of the calculation accuracy of the fuel vapor concentration, which is not advisable

Method used

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Examples

Experimental program
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Effect test

no. 1 example

[0055] In the example shown in FIG. 1, a fuel vapor processing apparatus 10 according to a first embodiment of the present invention is provided to an internal combustion engine 1 (hereinafter referred to as "engine") of a vehicle.

[0056]The engine 1 is a gasoline engine that generates energy using gasoline fuel contained in a fuel tank 2 . For example, the intake passage 3 of the engine 1 is equipped with an injection device 4, a throttle valve 5, an airflow sensor 6, an intake air pressure sensor 7, etc., the injection device 4 is used to control the fuel injection amount, and the throttle valve 5 is used to control the intake air pressure. The air flow sensor 6 is used to detect the intake air volume, and the intake air pressure sensor 7 is used to detect the intake air pressure. Further, an air-fuel ratio sensor 9 for detecting an air-fuel ratio, for example, is equipped in the discharge passage 8 of the engine 1 .

[0057] The fuel vapor processing apparatus 10 treats ...

no. 2 example

[0133] As shown in FIG. 15, the second embodiment of the present invention is a modification of the first embodiment. Component parts that are substantially the same as those in the first embodiment will be identified by the same reference numerals, and descriptions thereof will be omitted.

[0134] In the fuel vapor processing apparatus 100 of the second embodiment, instead of the passage switching valve 20 constituted by a three-way valve, passage connection valves 110 , 112 each constituted by an electromagnetically driven two-way valve are electrically connected to the ECU 38 .

[0135] Specifically, the first channel connection valve 110 is connected to the first atmospheric channel 30 and the end of the first detection channel 28 opposite to the second tank 13 . The first channel connection valve 110 connected in this manner is opened or closed to control communication between the first atmospheric channel 30 and the first detection channel 28 . Therefore, with the firs...

no. 3 example

[0140] As shown in FIG. 19, the third embodiment of the present invention is another modification of the first embodiment. Component parts that are substantially the same as those in the first embodiment will be identified by the same reference numerals, and descriptions thereof will be omitted.

[0141] In the fuel vapor processing apparatus 150 of the third embodiment, instead of the passage connection valve 19 and the tank closing valve 22 each composed of a two-way valve, the connection switching valve 160 composed of an electromagnetically driven three-way valve is electrically connected to the ECU 38 middle.

[0142] Specifically, the communication switching valve 160 is connected to the first transfer channel 162, and the first transfer channel 162 is connected to the first detection channel 28, instead of connecting the channel opening / closing valve 21 (throttle valve 50) and the second tank 13. Transit channel 29 between. Furthermore, a communication switching valve...

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PUM

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Abstract

A fuel vapor treatment apparatus includes a first canister, a purge passage, an atmosphere passage, a first detection passage provided with a restrictor, and a passage-changing valve for changing the connection passage of the first detection passage between the purge passage and the atmosphere passage. The apparatus further includes a second canister connecting with the first detection passage on the opposite side of the passage-changing valve across the restrictor. A differential pressure sensor detects a pressure difference between both ends of the restrictor. An ECU computes the concentration of fuel vapor on the basis of the detection result of the differential pressure sensor.

Description

[0001] This application is a divisional application of Chinese patent application No. 200610074176.7 submitted on April 7, 2006. technical field [0002] The invention relates to a fuel vapor treatment device. Background technique [0003] Conventionally known fuel vapor treatment equipment causes a canister to temporarily absorb fuel vapor generated in a fuel tank, and then introduces the fuel vapor released from the canister into an intake passage of an internal combustion engine as required to purify the fuel vapor. This type of fuel vapor processing equipment is designed to measure the concentration of fuel vapor in the air-fuel mixture introduced into the intake passage before fuel vapor purification, and it is also a fuel vapor treatment device that precisely controls the air-fuel ratio in the purified air-fuel mixture equipment. In the fuel vapor processing equipment disclosed in Japanese patent applications JP5-18326 A and JP6-101534 A, the flow rate or density of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/08
CPCF02M25/089
Inventor 加纳政雄高仓晋佑中野智章天野典保清宫伸介西村勇作
Owner DENSO CORP