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Leakage checking up device for fuel oil vapour eliminating system

A technology of cleaning system and inspection device, which is applied in the application of electrical devices to test fluid tightness, measuring devices, charging systems, etc., can solve the problems of inability to meet the leakage reference value and leakage reference value, and it is difficult to improve the leakage inspection accuracy.

Active Publication Date: 2009-05-13
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Due to the reasons mentioned above, it will be difficult to improve the accuracy of leak detection with the prior art described above
Therefore, it is likely that the leakage baseline value specified by CARB and EPA, or a more stringent leakage baseline value in the future will not be met

Method used

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  • Leakage checking up device for fuel oil vapour eliminating system
  • Leakage checking up device for fuel oil vapour eliminating system
  • Leakage checking up device for fuel oil vapour eliminating system

Examples

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Effect test

no. 1 example

[0033] like figure 1 As shown, the fuel vapor removal system includes: a fuel tank 2; a carbon canister 3 as an adsorption filter, which is connected with the fuel tank 2 through a connection flow channel 2a, and also has a ventilation flow channel 41; Valve desorption control valve 84. One end of the vent valve 84 is connected to the carbon canister 3 through a valve flow channel 82 , and the other end is connected to the intake system 80 of the internal combustion engine through the valve flow channel 82 . The canister 3 contains an adsorbent such as activated carbon.

[0034] Part of the fuel contained in the fuel tank 2 evaporates, thereby generating fuel vapor in the fuel tank 2 . The fuel vapor is guided into the canister 3, and is temporarily adsorbed and accumulated in the canister. When the desorption control valve 84 is opened by the low-pressure air in the intake system 80 , the air is sucked in through an external flow channel 42 , the carbon canister 3 and the...

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PUM

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Abstract

An evaporated fuel purge system has a fuel tank, an adsorption filter and a purge control valve. The evaporated fuel purge system is pressurized and depressurized through a venting flow path by a pump, so that the state of leakage therefrom is thereby inspected. For this inspection, a motor unit for driving the pump which applies or reduces pressure, an in-vehicle battery and a voltage control circuit which controls a battery voltage to a predetermined voltage and supplies the motor unit with a current are provided. A switchover valve is integrated with the pump, the motor and the like into a single module.

Description

technical field [0001] The invention relates to a leakage inspection device for a fuel vapor removal system. Background technique [0002] A fuel vapor removal system includes, for example: a fuel tank for an internal combustion engine, an activated carbon canister, and a desorption control valve. This fuel vapor removal system is designed in such a way that the fuel vapor generated in the fuel tank is temporarily absorbed by the canister. The fuel vapor adsorbed into the carbon canister is sucked into the intake system of the internal combustion engine through the desorption control valve along with the fresh air introduced from the fresh air inlet on the canister. However, if there are defects such as cracks in the pipes or containers constituting the fuel vapor recovery passage, fuel vapor will leak to the outside, and the effect of preventing evaporative emission of fuel cannot be sufficiently achieved. For the fuel vapor recovery passage, It leads from the fuel tank t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M25/08G01M3/06F02D45/00G01M3/26G01M3/02G01M3/40G01M15/00G01M15/04
CPCF02M25/0818F02D2200/503F02M25/0827
Inventor 加纳政雄山田悦史小林充幸稻垣幸一
Owner DENSO CORP
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