JP2011084088A - Piping device of canister - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve processing performance of fuel evaporation gas by introducing the atmosphere of a low temperature into a canister when operating an engine when the atmosphere around the canister is higher than a prescribed temperature, and to suppress generation of gasoline smell in a vehicle when stopping the engine. <P>SOLUTION: In this piping device of the canister disposed in an engine room in a vehicle front part to capture fuel evaporation gas, the canister includes an evaporation line for introducing the fuel evaporation gas generated in a fuel tank, a canister suction hose for introducing the atmosphere and a purge line for supplying fuel separated from the fuel evaporation gas sucked in the canister to the engine. The canister suction hose is mounted in a low temperature pipe for air-conditioning, and the canister suction hose and the low temperature pipe are arranged at an overlapping position in a vehicle longitudinal direction in a vehicle front view. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a canister piping device, and more particularly to a canister piping device that improves the piping state of a canister that collects fuel evaporative gas and improves the processing performance of the fuel evaporative gas in an engine.

  Conventionally, a canister piping device introduces a low-temperature atmosphere (which can also be referred to as “air”) to prevent a drop in fuel evaporative gas separation performance and suppress the occurrence of gasoline odor in the passenger compartment. There was a need.

Japanese Patent Laid-Open No. 6-278483 JP-A-8-135525

By the way, in the conventional canister piping device, the above-mentioned Patent Document 1 or Patent Document 2 is used as a measure for preventing a drop in fuel evaporative gas separation performance and suppressing the generation of a gasoline odor in the passenger compartment. Are disclosed.
In those disclosed in Patent Document 1 or Patent Document 2, the atmosphere opening port of the canister suction hose for introducing the atmosphere into the canister is disposed at a position lower than the cap (upper part) of the canister, resulting in a relatively high temperature. The air that is not flowing is guided into the canister by a canister suction hose.
However, in the conventional structure disclosed in Patent Document 1 or Patent Document 2 described above, a relatively high temperature atmosphere is introduced into the canister when the engine is operating, particularly when the temperature becomes high, such as in summer. There is a disadvantage that the amount of the fuel evaporative gas leaving the canister is reduced, and the processing performance of the fuel evaporative gas by the engine is lowered.
As a result, when the engine is stopped, the fuel evaporative gas that has not been combusted by the engine during engine operation remains in the canister, and the fuel evaporative gas that can no longer be adsorbed by the canister leaks to the outside, resulting in gasoline odor in the passenger compartment. There was a risk of occurrence.

  In the present invention, when the atmosphere around the canister is higher than a predetermined temperature, a low-temperature atmosphere is introduced into the canister when the engine is operated to improve the processing performance of the fuel evaporative gas, and the gasoline smell in the vehicle when the engine is stopped. It aims at suppressing generation | occurrence | production of this.

  Accordingly, in order to eliminate the inconvenience described above, the present invention provides a canister piping device that is disposed in an engine room at the front of a vehicle and collects fuel evaporative gas. The canister is a fuel generated in a fuel tank. An evaporation line for introducing evaporative gas; a canister suction hose for introducing air; and a purge line for supplying fuel released from the fuel evaporative gas adsorbed to the canister to the engine. The canister suction hose and the low-temperature pipe are arranged in a position overlapping with each other in the vehicle front-rear direction when attached to the pipe and viewed from the front of the vehicle.

As described above in detail, according to the present invention, in the canister piping device that is disposed in the engine room in the front portion of the vehicle and collects the fuel evaporative gas, the canister includes the fuel evaporative gas generated in the fuel tank. The canister suction hose for introducing air, the canister suction hose for introducing the atmosphere, and the purge line for supplying the fuel released from the fuel evaporative gas adsorbed to the canister to the engine, the canister suction hose is attached to the low-temperature pipe for the air conditioner In the vehicle front view, the canister suction hose and the low-temperature pipe are arranged at positions overlapping in the vehicle front-rear direction.
Therefore, the canister suction hose and the surrounding air can be cooled by the air conditioning suction pipe which is the low temperature pipe.
This introduces a low-temperature atmosphere with high oxygen concentration into the canister through the canister suction hose during engine operation, thereby improving the ability to remove the fuel adsorbed on the canister and processing the fuel evaporative gas in the engine. Can be improved.
For this reason, when the engine is stopped, the amount of fuel evaporative gas that can be adsorbed to the canister is increased, and the generation of gasoline odor in the passenger compartment can be suppressed.

FIG. 1 is a schematic enlarged plan view of a canister portion disposed in an engine room. Example 1 FIG. 2 is a schematic plan view of the vehicle. Example 1 FIG. 3 is a schematic enlarged front view of a canister portion disposed in the engine room. Example 1 FIG. 4 is a schematic enlarged left side view of a canister portion disposed in the engine room. Example 1 FIG. 5 is a schematic enlarged left side view of a canister portion disposed in the engine room. (Example 2)

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

1 to 4 show a first embodiment of the present invention.
In FIG. 2, 1 is a vehicle, 2 is a left front wheel, 3 is a right front wheel, 4 is a left rear wheel, 5 is a right rear wheel, and 6 is an engine room formed in the front portion of the vehicle 1.
That is, in the vehicle 1, as shown in FIG. 2, the engine room 6 is defined in the front portion of the vehicle 1 by the space between the left and right front wheels 2 and 3 of the vehicle 1 and the dash panel 7.
As shown in FIGS. 1 and 2, an engine 8 is mounted at a substantially central portion of the engine room 6, and an air cleaner 9 is attached to the upper portion of the engine 8.
At this time, in the engine room 6, as shown in FIG. 2, an intake manifold 10 is attached to the rear side of the engine 8 and an air conditioner compressor 11 is disposed on the right front side of the engine 8. A radiator 12 is disposed on the left front side, and an air conditioner capacitor 13 is disposed on the front side of the radiator 12 in the vehicle.
Further, as shown in FIG. 2, a fuel tank 14 is disposed at the rear portion of the vehicle 1, that is, in the vicinity of between the left and right rear wheels 4, 5. The fuel tank 14 is provided with a fuel pump 15, and the fuel tank 14. Is connected to the engine 8 by a fuel line 16.

Further, in the engine room 6 of the vehicle 1, as shown in FIGS. 1 to 4, a canister 17 that collects fuel evaporative gas is fixed to the dash panel 7 disposed behind the engine room 6. ing.
The canister 17 includes an evaporation line 18 for introducing a fuel evaporative gas generated in the fuel tank 14, a canister suction hose 19 for introducing the atmosphere, and a fuel released from the fuel evaporative gas adsorbed on the canister 16 in the engine. 8 and a purge line 20 to be supplied to the vehicle.
That is, in the vehicle 1, as shown in FIG. 2, the fuel line 16 and the evaporation line 18 are respectively directed from the fuel tank 14 disposed at the rear of the vehicle toward the engine room 6 formed at the front of the vehicle. Arranged.
The evaporation line 18 that has reached the dash panel 7 disposed behind the engine room 6 passes through the opening (not shown) formed in the dash panel 7 as shown in FIGS. 6 enters the right side of the canister 17 along the front surface of the dash panel 7 located at the rear of the canister 17 in the vehicle. Thereafter, the vehicle heads along the right side of the canister 17 while inclining forward and upward of the vehicle. Then, when it reaches the front side of the canister 17, it rises toward the upper center of the front side of the canister 17 and is connected to the upper center of the canister 17.
Further, in the purge line 20, as shown in FIGS. 1, 3, and 4, one end of the purge line 20 is connected to the upper right side of the canister 17 and is directed to the front side of the canister 17 after facing the front of the vehicle. It reaches. Then, after traversing the engine 8 in the vehicle width direction, the engine 8 is connected to a vacuum switching valve (also referred to as “VSV”) 21 attached to the rear portion of the engine 8.
The vacuum switching valve 21 is controlled to be opened and closed by a control signal from a control means (not shown), and is separated from the fuel evaporative gas adsorbed by the canister 16, that is, the engine 8 through the purge line 19. Is controlled in accordance with the driving state of the engine 8 and other operating states.

The canister suction hose 19 is attached to a low-temperature pipe for an air conditioner (not shown) that air-conditions the passenger compartment of the vehicle 1, for example, an air-conditioner suction pipe 22, and the air conditioner that is the canister suction hose 19 and the low-temperature pipe in a front view of the vehicle. The suction pipe 22 is arranged at a position overlapping with the vehicle longitudinal direction.
More specifically, in the piping state of the canister suction hose 19, one end of the canister suction hose 19 is connected to the upper left side of the canister 17 as shown in FIGS. 1, 3, and 4. After rising toward the left side of the vehicle, it becomes a curved shape and goes downward along the left side of the canister 17, and the atmosphere opening 23 is directed to the lower side of the rear dash panel 7 at a height position near the lower end of the canister 17. Yes.
In the piping state of the air conditioner suction pipe 22, the air conditioner suction pipe 22 enters the engine room 6 through the opening 24 formed in the dash panel 7 as shown in FIGS. Then, the air conditioner suction pipe 22 rises along the dash panel 7 so as to bend, then the rear upper part of the canister 17 faces the right side of the vehicle, passes through the canister 17, and descends along the dash panel 7. Thereafter, the air conditioner suction pipe 22 is connected to the air conditioner compressor 11 attached to the front right side of the engine 8 toward the front of the vehicle.
Further, in the vicinity of the air release port 23 of the canister suction hose 19, that is, between the position where the canister suction hose 19 faces downward along the left side of the canister 17 and the air release port 23, FIGS. As shown in FIG. 4, the air-conditioner suction pipe 22 is arranged at a position overlapping in the vehicle front-rear direction.
At this time, the relationship between the positions of the canister suction hose 19 and the air conditioner suction pipe 22 is as follows. As shown in FIG. 4, the canister suction hose 19 is positioned on the front side of the vehicle, and the air conditioner is located behind the canister suction hose 19. The suction pipe 22 is located.

Therefore, the canister suction hose 19 and the surrounding air can be cooled by the air conditioning suction pipe 22 located behind the canister suction hose 19.
As a result, when the engine 8 is operated, a low-temperature atmosphere having a high oxygen concentration is introduced into the canister 17 through the canister suction hose 19, thereby improving the detachability of the fuel adsorbed on the canister 17. The processing performance of the fuel evaporative gas can be improved.
Therefore, when the engine 8 is stopped, the amount of fuel evaporative gas that can be adsorbed by the canister 17 can be increased, and the generation of gasoline odor in the passenger compartment can be suppressed.
Here, for reference, the above-described oxygen concentration is additionally described.
The weight flow rate of the atmosphere (air) increases the oxygen concentration because oxygen is compressed at a low temperature compared to a high temperature.
That is, when the same volume of air is introduced into the canister 17, the lower temperature air can introduce more oxygen than the higher temperature air.

Further, the canister suction hose 19 is disposed in the vicinity of the air conditioning suction pipe 22 which is the low temperature pipe.
That is, when the canister suction hose 19 is positioned on the front side of the vehicle and the air-conditioner suction pipe 22 is positioned behind the canister suction hose 19, as shown in FIGS. The canister suction hose 19 and the air conditioner suction pipe 22 are fixed by a clamp 25.
Further, as shown in FIG. 4, the canister suction hose 19 is arranged substantially parallel to the shape of the air conditioner suction pipe 22 in a side view of the vehicle.
As shown in FIG. 1, a part of the air-conditioner discharge pipe 26 has a vehicle rearward position in the vehicle width direction along the front surface of the dash panel 7 with respect to the intake manifold 10 attached to the rear side of the engine 8. Oppositely, it is arrange | positioned so that the said opening 24 formed in the dash panel 7 may be passed.
Therefore, the canister suction hose 19 and the surrounding air are connected by the low-temperature air-conditioning suction pipe 22 by arranging the canister suction hose 19 substantially in parallel with the shape of the air-conditioning suction pipe 22 which is a low-temperature piping for air-conditioning. Cooling over a wider range is possible.
Further, since the canister suction hose 19 is arranged substantially in parallel along the shape of the air conditioner suction pipe 22, the canister suction hose 19 is easily affected by the cooling of the low temperature air conditioner suction pipe 22 in a wider range.
Furthermore, the processing performance of the fuel evaporative gas during the operation of the engine 8 can be further improved.
Therefore, the amount of fuel evaporative gas adsorbed on the canister 17 when the engine 8 is stopped can be increased, and the generation of gasoline odor in the passenger compartment can be reliably suppressed even when the atmospheric temperature of the canister 17 is high. it can.

FIG. 5 shows a second embodiment of the present invention.
In the second embodiment, portions that perform the same functions as those of the first embodiment will be described with the same reference numerals.

  In the first embodiment described above, the air conditioner suction pipe 22 is positioned behind the canister suction hose 19. However, the second embodiment is characterized by the canister suction hose 31 and the air conditioner suction pipe. This is because the relationship of the piping position in the vehicle longitudinal direction with respect to 32 is reversed.

That is, the canister suction hose 31 is disposed at the vehicle rear portion of the air-conditioner suction pipe 32 that is a low-temperature pipe for an air-conditioner and close to the shape of the air-conditioner suction pipe 32. Thus, the front side of the canister suction hose 31 is covered.
More specifically, as shown in FIG. 5, when the air conditioning suction pipe 32 is disposed, the air conditioning suction pipe 32 enters the engine room 6 through an opening formed in the dash panel 7.
The air conditioner suction pipe 32 is curved and rises along the dash panel 7, that is, at the curved portion 33, so that the canister suction hose 31 passes through the vehicle rear portion of the curved portion 33. The canister suction hose 31 is arranged close to the shape of 32.
Further, the air conditioner suction pipe 32 and the canister suction hose 31 are fixed by a clamp 34.
Accordingly, since the canister suction hose 31 is attached to the rear portion of the air conditioning suction pipe 32 and the front side of the canister suction hose 31 is covered by the air conditioning suction pipe 32, the white arrow in FIG. As shown, the air-conditioner suction pipe 32 is further cooled by the traveling wind from the front of the vehicle, so that the canister suction hose 31 and the surrounding air can be cooled more reliably.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Left front wheel 3 Right front wheel 4 Left rear wheel 5 Right rear wheel 6 Engine room 7 Dash panel 8 Engine 11 Air conditioner compressor 12 Radiator 13 Air conditioner condenser 14 Fuel tank 15 Fuel pump 16 Fuel line 17 Canister 18 Evaporate line 19 Canister suction hose 20 Purge line 21 Vacuum switching valve (also referred to as “VSV”)
22 Air conditioning suction pipe 23 Opening to atmosphere

Claims (3)

  In a canister piping device that is disposed in an engine room in front of a vehicle and collects fuel evaporative gas, the canister includes an evaporator line that introduces fuel evaporative gas generated in a fuel tank, and a canister suction that introduces air. A hose and a purge line for supplying fuel desorbed from the fuel evaporative gas adsorbed to the canister to the engine, the canister suction hose is attached to a low-temperature pipe for an air conditioner, and the canister suction hose is viewed from the front of the vehicle. A canister piping device, wherein the low-temperature piping and the low-temperature piping are arranged at positions overlapping in the vehicle longitudinal direction.   2. The canister according to claim 1, wherein the canister suction hose is disposed in proximity to the low-temperature pipe, and the canister suction hose is disposed along the shape of the low-temperature pipe in a side view of the vehicle. Piping equipment.   The canister suction hose is arranged in the vehicle rear portion of the low-temperature pipe and close to the shape of the low-temperature pipe, and the front side of the canister suction hose is covered by the low-temperature pipe. The canister piping device according to claim 1.

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