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Leakage detector for evaporated-fuel treatment device

A technology of a leak detection device and a processing device, which is applied to the layout, measuring device, power device, etc. combined with the fuel supply of an internal combustion engine, can solve the problems of evaporative fuel leakage and the driver's inability to directly confirm it.

Active Publication Date: 2020-03-31
AISAN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the evaporated fuel processing device has cracks, poor sealing, etc., the evaporated fuel will leak out of the processing system
Even if a leak of evaporated fuel like this occurs, the driver cannot directly confirm it

Method used

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  • Leakage detector for evaporated-fuel treatment device
  • Leakage detector for evaporated-fuel treatment device
  • Leakage detector for evaporated-fuel treatment device

Examples

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Embodiment Construction

[0023] Next, one embodiment of the technique disclosed in this specification will be described. The evaporated fuel processing device according to the present embodiment is a device for preventing the evaporated fuel generated in the fuel tank of a vehicle such as an automobile from leaking into the atmosphere, and is configured such that the evaporated fuel is temporarily collected in the adsorption canister and then inside the internal combustion engine. Combusting the evaporated fuel. In addition, the evaporated fuel processing apparatus is provided with a leak detection device for diagnosing whether there is a leak in the processing system.

[0024]

[0025] Such as figure 1 As shown, the evaporated fuel processing device 10 has: a fuel tank 20, which is used to store fuels such as gasoline; an adsorption tank 30, which is configured to absorb and desorb evaporated fuel; 20 is connected with adsorption tank 30.

[0026] (fuel tank 20)

[0027] The fuel tank 20 is a ...

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PUM

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Abstract

A leakage detector for an evaporated-fuel treatment device (10) includes: the evaporated-fuel treatment device (10) including a fuel tank (20), a canister (30), and a fuel pump (21); a purge valve (32) and an air-passage valve (35) that maintain the interior of a treatment system of the evaporated-fuel treatment device (10) in a sealed state; a sealing valve (41) and a shutoff valve (43) that canshut off communication between the fuel tank (20) and the canister (30) to section the interior of the treatment system into a first region including the fuel tank (20) and a second region including the canister (30); and an aspirator (50) that applies a negative pressure to the second region. The leakage detector for the evaporated-fuel treatment device (10) determines the presence / absence of leakage in the first region on the basis of a change in the pressure in the first region while an engine (12) is stopped and determines the presence / absence of leakage in the second region on the basis of a change in the pressure in the second region by applying a negative pressure to the second region while the engine (12) is operated.

Description

technical field [0001] The technology disclosed in this specification relates to a leak detection device of an evaporated fuel processing device. Background technique [0002] Vehicles that use gasoline or the like as fuel are equipped with an evaporated fuel treatment device that prevents the fuel tank from being damaged due to an increase in internal pressure and prevents the evaporated fuel from diffusing into the atmosphere. However, when the evaporated fuel processing device has cracks, poor sealing, etc., the evaporated fuel leaks from the processing system. Even if such a leak of evaporated fuel occurs, the driver cannot directly confirm it. Therefore, there has been proposed a leak detection device for diagnosing the presence or absence of a leak in an evaporated fuel processing device (see, for example, JP-A-2010-265860). [0003] The leak detection device described in Japanese Patent Application Laid-Open No. 2010-265860 is configured so that air can be moved fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/08
CPCF02M25/08F02M25/0854F02M25/0836F02M25/0818B60K2015/03243B60K15/03B60K15/03504B60K2015/03514B60K15/03519G01M3/3272G01M3/2815G01M3/3209
Inventor 中川周中谷文人日置和孝
Owner AISAN IND CO LTD
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