JPH023028B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a fuel tank device for a vehicle.

(Prior art) Generally, a fuel tank device is as shown in Fig. 3.
The fuel tank 1, the inlet pipe 3 that connects the fuel filler port 2 and the fuel tank 1, the canister 4 that opens into the upper space of the fuel tank 1 at one end and adsorbs evaporated fuel, and the other end that connects to the atmosphere through two directions 5. A ventilation passage 6 opens into the fuel tank 1, and a breather passage 8 whose one end opens into the fuel tank 1 defines a maximum fuel filling level 7.

(Problem to be solved by the invention) When refueling such a conventional fuel tank device,
Conventionally, fuel has been supplied by simply inserting the fuel gun 11 into the fuel filler port 2, which has resulted in a problem that evaporated fuel may diffuse into the atmosphere from the fuel filler port 2 during fuel supply. In order to eliminate such a problem, it is conceivable to provide a sealing material 12 in the fuel filler port 2, for example, to close the gap between the fuel filler port 2 and the fuel gun 11 when the fuel filler gun 11 is inserted.

However, when refueling is performed with the fuel filler port 2 sealed in this manner, the two-way valve 5 in the ventilation passage 6 is configured to open when the internal pressure of the fuel tank 1 exceeds a predetermined value. The air and evaporated fuel in the fuel tank 1 have no place to escape, so the fuel immediately reaches the upper end of the inlet pipe 3, which activates the auto stopper attached to the fuel gun 11, making it impossible to supply sufficient fuel. occurs.

The present invention has been devised to solve the above-mentioned problems, and an object of the present invention is to prevent the diffusion of evaporated fuel into the atmosphere during fuel supply;
Another object of the present invention is to provide a fuel tank device that can smoothly supply fuel while sealing the fuel filler port side.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a two-way valve whose one end opens into the upper space within the fuel tank and which regulates the pressure within the fuel tank, and a two-way valve that adsorbs evaporated fuel. A ventilation passage whose other end opens to the atmosphere through the first canister, and whose one end opens into the fuel tank and the other end opens to the atmosphere, and defines a maximum filled liquid level in the fuel tank. In the fuel tank device, a second canister is provided which adsorbs evaporated fuel in the breather passage, and a sealing member is provided at a filler port of an inlet pipe for fuel injection and closes a gap with the fuel supply device. and a valve that opens when fuel is supplied is provided on one end side of the breather passage from the second canister.

(Operation) When fuel is supplied, the valve is opened, and as fuel is supplied, the air and evaporated fuel in the fuel tank pass through the breather passage, the evaporated fuel is adsorbed by the second canister, and only clean air is released into the atmosphere.

After the fuel is supplied, the valve is closed and the air and vaporized fuel in the fuel tank no longer flow through the breather passage.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic diagram of a fuel tank device according to the present invention, in which the same parts and parts as those in the conventional device are denoted by the same reference numerals. 21 and a breather passage 22 is provided. The breather passage 22 has a passage 24 that connects with the opening 21 and an opening 23 provided at two oil supply ports inside the sealing material 12, an opening 25 at one end above the passage 24, and a canister (a second opening) at the other end. 2 canister) 26 is connected to the passage 2
It consists of 7. The opening 25 is provided above the highest liquid level 28 in the passage 24 during fuel supply.

The passage 27 is provided with a valve 31 that opens when fuel is supplied. For example, this valve 31 is a solenoid valve that opens via a switch 33 when the lid 32 of the fuel filler port 2 is opened and closes when it is closed, and connects the downstream side of the solenoid 31 in the passage 27 to the inlet 34 of the canister 26. do.

The canister 26 has two partition members 41,
The interior is defined by three spaces 43, 44, and 45 by 42, and the introduction port 34 is formed by an inner pot 46 etc. disposed in the space 43 at one end.
The middle space 44 is filled with activated carbon 47 to absorb steam fuel, and the space 45 at the other end has an opening 48 open to the atmosphere. and an inner pot 46 in the space at one end.
A passage 49 that connects to the engine side, for example, the inlet manifold, is opened on the outside of the inlet manifold.

Reference numeral 51 denotes a relief valve provided upstream of the solenoid valve 31 in the passage 27, and the relief valve 51 operates when the lid 32 is opened and the solenoid valve 31 does not open. Note that the above-mentioned canister 4 is the first
The fuel gun 11 corresponds to a canister, and also represents one aspect of a fuel supply device.

Since the present embodiment is configured as described above, when the fuel gun 11 is inserted into the fuel filler port 2, the fuel filler port 2 is sealed, and fuel is supplied, the solenoid valve 31 is already open when the lid body 32 is opened. Therefore, as fuel is supplied, the air and evaporated fuel in the fuel tank 1 and inlet pipe 3 smoothly pass through the passages 24 and 27 and reach the inlet 34, and the evaporated fuel is absorbed by the activated carbon 47, leaving only clean air. is released into the atmosphere through opening 48.

Eventually, the fuel level reaches above the passage opening 21, and the fuel level 28 rises in the passage 24 and the tip of the refueling gun 11, activating the auto stopper of the refueling gun 11.
The solenoid valve 31 is closed by ending the fuel supply and closing the lid 32 of the fuel filler port 2.

Similar to the evaporative fuel stored in the canister 4 of the ventilation passage 6, the evaporated fuel stored in the canister 26 of the breather passage 22 is passed through the passage 49 together with the atmospheric air sucked in from the opening 48 by the negative pressure on the engine side. and is sent to the engine side.

FIG. 2 shows a second embodiment of the invention. In the second embodiment, a valve 61 is provided in the space 43 of the canister 26, and when the lid 32 is opened, the opening 34 is opened and the opening 49a of the passage 49 is closed, and when the lid 32 is closed, the opening 34 is closed. The structure is such that the opening 49a is opened. In the second embodiment, in addition to the functions and effects of the first embodiment, since there is no inner pot 46, the entire activated carbon 47 filled in the canister 26 can be used effectively.

Incidentally, the fuel tank device according to the present invention has a passage 27 and a conventional fuel tank device equipped with a breather passage 8.
Since it is sufficient to simply add the canister 26, the valve 31, etc., it is possible to apply the present invention to conventional devices equipped with the breather passage 8 very easily.

(Effect of the invention) As is clear from the above explanation, according to the present invention,
Diffusion of evaporated fuel into the atmosphere during fuel supply can be prevented, and fuel can be supplied smoothly while sealing the fuel filler port side.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the present device, FIG. 2 is a schematic diagram of a second embodiment, and FIG. 3 is a schematic diagram of a conventional device. In the drawing, 1 is a fuel tank, 2 is a fuel filler port, 3 is an inlet pipe, 6 is a ventilation passage, 22 is a breather passage, 26 is a canister, 31, 61
is a valve.

Claims (1)

[Claims] 1. One end opens into the upper space inside the fuel tank, and the other end opens into the atmosphere through a two-way valve that regulates the pressure inside the fuel tank and a first canister that adsorbs evaporated fuel. a breather passage with one end opening into the fuel tank and the other end opening toward the atmosphere and defining a maximum filling level in the fuel tank; and a refueling inlet pipe for fuel injection. A fuel tank device including a sealing member provided at a mouth and closing a gap with a fuel supply device, wherein a second canister for adsorbing evaporated fuel is provided in the breather passage, and one end side of the breather passage is provided from the second canister to the second canister. A fuel tank device characterized in that the fuel tank device is provided with a valve that opens when fuel is supplied. 2. The fuel tank device according to claim 1, wherein the valve opens and closes in conjunction with a lid of a fuel filler port.