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Leak diagnostic device for evaporated fuel processing device

A technology for processing device and evaporating fuel, applied in the direction of fuel injection device, special fuel injection device, measuring device, etc., which can solve the problems of leakage, undetectable by the driver, poor sealing, etc.

Inactive Publication Date: 2021-08-31
AISAN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the evaporated fuel processing device has cracks, poor sealing, etc., the evaporated fuel will leak from the internal space of the evaporated fuel processing device.
Even if such leakage of evaporated fuel occurs, the driver cannot directly detect it.

Method used

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  • Leak diagnostic device for evaporated fuel processing device
  • Leak diagnostic device for evaporated fuel processing device
  • Leak diagnostic device for evaporated fuel processing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0023] Hereinafter, Embodiment 1 of the technology disclosed in this specification will be described. The evaporated fuel treatment device of the present embodiment prevents evaporated fuel generated in a fuel tank of a vehicle such as an automobile from leaking to the atmosphere, and is configured to burn the evaporated fuel in an internal combustion engine after temporarily trapping the evaporated fuel in a canister. In addition, the evaporated fuel processing device is provided with a leak diagnosis device for diagnosing whether or not the evaporated fuel has leaked from the internal space of the evaporated fuel processing device.

[0024]

[0025] like figure 1 As shown, the evaporated fuel processing device 10 includes a fuel tank 20 storing fuel F such as gasoline, an adsorption canister 30 capable of absorbing and desorbing evaporated fuel, and a vapor passage 40 connecting the fuel tank 20 and the adsorption canister 30 .

[0026] (fuel tank 20)

[0027] The fuel ...

Embodiment approach 2

[0061] Next, refer to Figure 4 The evaporated fuel processing device 110 according to Embodiment 2 will be described. In addition, since Embodiment 2 is a structure which changed part of Embodiment 1, difference is demonstrated, and the same code|symbol is attached|subjected to the same or similar structure, and description is abbreviate|omitted.

[0062] In the evaporated fuel processing device 110, such as Figure 4 As shown, the vapor passage 40 connecting the fuel tank 20 and the adsorption canister 30 is not branched and has no valves. Therefore, the fuel tank 20 and the canister 30 are always in communication via the vapor passage 40 , and the internal pressure of the fuel tank 20 and the internal pressure of the canister 30 are generally substantially equal. Therefore, the evaporated fuel processing device 110 has only the first pressure sensor 25 for measuring the internal pressure of the fuel tank 20 , and does not have a pressure sensor for measuring the internal ...

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PUM

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Abstract

The present invention provides a leak diagnostic device for an evaporated fuel processing device, which can be mounted on a vehicle or the like more easily. The leak diagnosis device for the evaporated fuel processing device (10) including a fuel tank (20) and a canister (30) that communicate with each other via a vapor passage (40), the leak diagnosis device comprising: an aspirator (50) that is disposed inside the fuel tank and that generates a negative pressure inside the aspirator; and a bypass passage (45), one end of which is connected to the aspirator, and which introduces the gas in the canister into the fuel tank by means of the negative pressure generated by the aspirator. A positive pressure relief valve (42) as a check valve that allows the flow of fluid from the fuel tank to the canister, and a shut-off valve (41) that is electrically controlled by an ECU (60) to open and close are provided in parallel in the vapor passage. The bypass passage (45) is provided with a negative pressure relief valve (46) as a check valve that allows the flow of the fluid from the canister to the fuel tank.

Description

technical field [0001] The technology disclosed in this specification relates to a leakage diagnosis 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 evaporated fuel from diffusing into the atmosphere while avoiding damage caused by an excessive rise or fall in the internal pressure of the fuel tank. However, if the evaporated fuel processing device has cracks, poor sealing, etc., the evaporated fuel will leak from the internal space of the evaporated fuel processing device. Even if such leakage of evaporated fuel occurs, the driver cannot directly detect it. Then, a leak diagnosis device for diagnosing the presence or absence of a leak in an evaporated fuel processing device has been proposed (for example, refer to Patent Document 1). [0003] The leak diagnosis device of Patent Document 1 is configured to shut off the fuel ta...

Claims

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Application Information

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IPC IPC(8): F02M25/08
CPCF02M25/0809F02M25/0836F02M25/0818F02M2200/247G01M3/26G01M3/025
Inventor 武关尚人品川昌庆
Owner AISAN IND CO LTD