JPS6153451A - Evaporating fuel controller for vehicles - Google Patents

Abstract

PURPOSE:To aim at smooth oil feeding as well as prevention of the discharge of evaporating fuel to the outside of a car, by installing a control valve, which makes a passage are larger in time of oil feeding while smaller in time of normal driving, interposingly between a fuel tank of an evaporating fuel passage and an adsorption member. CONSTITUTION:An upper space 1a of a fuel tank 1 is opened to an adsorption member 5 made up of charging a adsorbent 4 to the inside of a casing 3 via an evaporating fuel passage 2, while this adsorption member 5 is connected to the downstream side of a throttle valve 13 in a suction passage 12 via a connection passage 11 provided with an on-off valve 14 alongside. At the evaporating fuel passage 2, there is provided with a pressure controlling device 6 made up of parallelly connecting check valves 6a and 6b to be opened or closed in response to adjustable variations to the setting value of pressure inside the said space 1a side by side. And, at the above-mentioned, a control valve 8, which makes a passage area large in time of being on in a switch 10 detecting oil feeding time while smaller in time of being off in the switch 10 or unfeeding is made to be installed in parallel with the pressure controlling device 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fuel vapor control device for a vehicle that completely prevents fuel vapor in a fuel tank from being released into the atmosphere. 7+.

(Prior Art) Fuel used in vehicles such as automobiles tends to evaporate, and when released into the atmosphere, it causes air pollution.

Therefore, U.S. Patent No. 3. ．． 21r, No. 7//, the evaporated fuel passage has one end opening into the upper space of the fuel tank and the other end opening into the intake passage via a filter (adsorption member). A check valve is provided between the filter of the evaporated fuel passage and the fuel tank as a control valve that opens when the pressure in the upper space exceeds a set value. The filter adsorbs the evaporated fuel generated during engine retraction and engine retraction, and
It is known to prevent its release into the atmosphere by burning it with di/.

However, with the i-Kuzou equipped with such a check valve, the check valve creates resistance during refueling, making it difficult to refuel smoothly, and also because a large amount of evaporated fuel is sent to the filter during normal operation. A problem arises in that adsorption is no longer possible and evaporated fuel escapes into the atmosphere.

(Object of the Invention) The present invention provides a vehicular evaporative fuel control device that can prevent evaporative fuel from being released to the outside of the vehicle during refueling and normal driving.

(Structure of the Invention) The present invention is characterized in that a control valve is interposed between the fuel tank and the adsorption member in the evaporative fuel passage, which increases the passage area during refueling and reduces the passage area during normal operation. That is.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

Embodiment/ In FIG. 1, 1 is a fuel tank, 2 is an evaporated fuel passage, one end of which communicates with the upper space 1a of the fuel tank 1, and the other end of which is provided with an adsorbent 4 in a casing 3. It is opened to the suction member 5.

The vaporized fuel passage 2 is connected to an upper space 1a in the fuel tank 1.
A pressure control means 6 for maintaining the internal pressure within a set range is provided, and is electrically connected to a first passage 7 having a relatively small passage area and a switch means 1° for detecting the time of refueling, so that the passage area is increased during refueling. A control valve 8 that increases the passage area while reducing the passage area at other times, and a second passage 9 that has a relatively large passage area.
and has.

The pressure control means 6 includes a first check valve 6a that releases the pressure when the pressure in the upper space 1a of the fuel tank 1 exceeds a set upper limit, and a first check valve 6a that releases the pressure when the pressure falls below a set lower limit. A second check valve 6b for introducing atmospheric pressure is provided in parallel.

The adsorption member 5 connects to the intake passage 1 via the connection passage 11.
The connecting passage 11 is connected downstream of the throttle valve 13 of No. 2.
An on-off valve 14 is interposed in the middle, and a valve body 14a of the on-off valve 14 is controlled by a diaphragm device 15.

In the diaphragm device 15, a casing 15a is divided by a diaphragm 15b into an atmospheric chamber 15c and a negative pressure chamber 15d, and a spring 15e is compressed in the negative pressure chamber 15d and connected to the diaphragm 15b via a connecting rod 15ft. The valve body 14ak is always biased in the closing direction. The negative pressure chamber 15d is connected to the intake passage 12 via a communication passage 16, and is activated to open the connection passage 11 during operation except during low load such as idling operation. At times of low load, the deterioration in combustibility caused by supplying the vaporized fuel adsorbed by the adsorbent 4 to the intake passage 12 is prevented.

As shown in FIG. 2, the switch means 10 controls the opening and closing of a cap member 22 that is detachably attached to the fuel filler port 1b of the fuel tank 1 on the side of the portion where the filler port 1b protrudes from the vehicle body 21. A switch member 23 for detection is fixedly installed, and a switch member 26 is turned on and off on the cap member 22.
A flange portion 22a for turning off is formed.

As shown in FIG. 3, the refueling port 1b is provided with a rubber annular sealing material 24 near the opening and an on-off valve 25 inwardly thereof, so that when refueling,
When the refueling gun 26 is inserted into the refueling port 1b and the hook member 27 is locked to the flange portion 1C of the refueling port 1b, the refueling gun 26 comes into contact with the sealing material 24 and airtightness is maintained fc7''L1
The on-off valve 25 is opened at the tip of the refueling gun 26, making it possible to refuel.

With the above configuration, when refueling, the camping member 2
2 is removed, the switch member 26 is turned ON, and the control valve 8 widens the passage area, so that the upper 3 spaces 1 of the fuel tank 1
The air containing the evaporated fuel a is adsorbed by the adsorption member 5 mainly through the second passage 9 of the evaporated fuel passage 2, which has a relatively large passage area.

Therefore, pressure changes in the upper space 1a of the fuel tank 1 due to refueling are absorbed and alleviated with good responsiveness, so refueling can be performed smoothly.

On the other hand, when not refueling, the cap member 22 is attached to the refueling port 1b and the switch member 22 is turned off, so the control valve 8 reduces the passage area of the first second passage 9. Accordingly, pressure changes in the upper space 1a of the fuel tank 1 are absorbed and summed mainly through the first passage 7 having the pressure control means 6. In this case, since the pressure change is sufficiently small compared to the time of refueling, the pressure tli control means 6
can be adequately addressed.

In addition, since the on-off valve 1.4 is opened during operation except under low load, the vaporized fuel sucked into the adsorption member 5 is supplied to the intake passage 12 via the connection passage 11, which adversely affects combustibility. It is gradually consumed without giving any.

In the above embodiment, the pressure control means 6t and two check valves 6a
Although the 14th one is formed using +6b, it is also possible to form 'iW' using an orifice. Although the control valve 8 is designed to have a small passage area when not refueling, the second passage 9 may be closed.

Example! This example is equipped with two suction members.

As shown in FIG. 7, the upper space 1a of the fuel tank 1
A large evaporated fuel passage 61 is connected to a first passage 33 in which a pressure control means 6 configured in the same manner as in the embodiment is interposed and one end of which is open to the small adsorption member 32, and a three-way valve 64 is interposed. A second passage 6 opened to the atmosphere via the adsorption member 35
6.

Note that the passage area is such that the first passage 33 is relatively small and the second passage 36 is relatively large. The opening/closing valve 14 is connected to the intake passage 12 below the throttle valve 13 61d via the connecting passage 11 in which the opening/closing valve 14 is disposed, and the opening/closing valve 14 is closed during low load when the opening degree of the throttle valve 13 is small. ing.

The three-way valve 34 connects the upper space 1a of the fuel tank 1 to the large adsorption member 65 during refueling, and connects the upper space 1a to the intake passage 12 via the passage 37 at other times. , switching is controlled. This passage 37 has a three-way valve 34 fJ1! An orifice 38 and an on-off valve 39 are provided from I to Ji, and the on-off valve 39 opens only when the opening degree of the throttle valve 13 is larger than during normal operation.

In addition, in order to prevent an adverse effect on the engine/engine 40, the orifice 38 is closed to the large adsorption member 3 before the next refueling.
It is set so that the evaporated fuel adsorbed in the fuel tank 5 can be consumed. 41 is air cleaner.

With the configuration 49 as described above, pressure changes in the upper space 1a of the fuel tank 1 are absorbed and alleviated, as in the case of the embodiment. Note that the evaporated fuel is mainly adsorbed by the large-sized adsorption member 35 during refueling, and by the small-sized adsorption member 62 at other times.

In each of the above embodiments, the sealing material 24 is provided in order to maintain sealing performance during refueling at the fuel filler port 1b of the fuel tank 1, and an on-off valve 25 is provided inside the sealing material 24. ), there is an enlarged part 42a'e in the middle of the fuel filler port 42.
A twisted rubber membrane member 4 is provided in the expanded portion 42a.
The lower ends of the sealing materials 28 fixed to the ring members 44 and 45 respectively are fixed to the upper and lower ends of the ring members 44 and 45, so that when the refueling gun 46 is inserted during refueling, the upper ring member 4
4 may be rotated to gently untwist the membrane member 46.0 (Effects of the Invention) Since the present invention is constructed as described above, pressure changes due to evaporated fuel in the fuel tank during refueling can be avoided. Since the fuel vapor can be absorbed, smooth refueling can be performed, and since the appropriate amount of evaporated fuel is supplied to the adsorption member during normal operation, it is possible to prevent the evaporated fuel from being released outside the vehicle.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG.
Fig. 2 is an explanatory diagram of the switch means for detecting the refueling time, Fig. 3 is an explanatory diagram of the refueling state, and Fig. 7 is an example! The overall configuration diagram of FIG. 5(a) is an explanatory diagram of a modification of the sealing means of the fuel filler port.

Claims (1)

[Claims] (1) An evaporated fuel passage whose one end communicates with the upper space of the fuel tank and whose other end opens into the intake passage is opened to the atmosphere through an adsorption member, and the passage is connected to the fuel tank. 1. An evaporative fuel control device for a vehicle, characterized in that a control valve is provided between an adsorption member and a control valve that increases a passage area during refueling and reduces the passage area during normal operation.