CN102555785B - Ventilation and the device of ventilation for fuel tank - Google Patents

Abstract

The present invention relates to a kind of ventilation for fuel tank (1), the especially fuel tank of the electromotor of motor vehicles and the device of ventilation, the active carbon filter of described device (7), controllable fuel tank stop valve (8) and two fuel tank pressures regulation valve (9,10), described fuel tank pressure regulation valve in one in fuel tank (1) for overvoltage time open, and another in fuel tank (1) for low pressure time open.In order to reduce the amount escaping into the volatile hydrocarbon environment from fuel tank stop valve (8) and fuel tank pressure regulation valve (9,10), according to the present invention, at least said two fuel tank pressure regulation valve (9,10) and the most not only said two fuel tank pressure regulation valve (9,10) but also fuel tank stop valve (8) are all disposed within the inside of described fuel tank (1).

Description

Ventilation and the device of ventilation for fuel tank

Technical field

The present invention relates to a kind of according to claim 1 as described in the preamble, for the ventilation of fuel tank and ventilation Device.

Background technology

Modern automotive is equipped with for the ventilation of fuel tank and the device of ventilation.On the one hand this device makes, to machine During motor-car refuelling, the admixture of gas being expelled from by fuel can escape from fuel tank interior, on the other hand stops, when environment temperature Degree occurs bigger when being raised and lowered, owing to being raised the evaporation/vaporization of the fuel caused by temperature or owing to being reduced by temperature The condensation of the fuel vapo(u)r caused and at hermetic closed fuel tank interior, less desirable overvoltage or low pressure/negative pressure occur.This dress Put and generally include controllable fuel tank stop valve, such as electromagnetic valve；Form is two machines of excess pressure valve and low pressure valve/negative pressure valve The fuel tank pressure regulation valve of tool, it is at least designed as the bypass valve of fuel tank stop valve；And it is arranged in described valve and environment Between active carbon filter, when fuel tank ventilates, this active carbon filter should stop Hydrocarbon from the fuel tank not phase Escape in air or environment with hoping.Fuel tank stop valve is normally closed, and opens during fuel tank refuelling, in order to The admixture of gas being expelled from by fuel is derived from the gas compartment or headroom of fuel tank.Additionally, when in fuel tank The pressure recorded by fuel tank pressure sensor beyond the overvoltage threshold that can set or less than the low pressure threshold that can set time, During electromotor works, fuel tank stop valve is generally opened under the control of the engine controller of electromotor, to avoid combustion Hopper load is excessive.Because be generally not capable of when electromotor does not works controlling fuel tank stop valve, so in this running status Under by two fuel tank pressures regulation valves, the pressure of fuel tank interior is limited.Here, such as raise when ambient temperature Time or engine close after the after heat stage (Nachheizphase) period, due to the evaporation of the fuel of fuel tank interior, Pressure in fuel tank be increased to excess pressure valve beyond overvoltage threshold when opening pressure, excess pressure valve automatically opens up；And such as when Ambient temperature reduce, the fuel condensation of fuel tank interior, and therefore make the as little as low pressure valve of the pressure drop in fuel tank less than low When opening pressure of threshold value of pressure, low pressure valve automatically opens up.Drawn from fuel tank effluent air mixture when fuel tank ventilates Turned on active carbon filter, in order to absorb volatile hydrocarbon (HC) contained in admixture of gas, thus only purify The air crossed arrives in environment.

In this kind of known devices, fuel tank stop valve and two fuel tank pressure regulation valves are generally combined as a valve list Unit or valve module, this valve cell or valve module are disposed in combustion due to the accessibility of improvement as active carbon filter Outside hopper.This valve cell or valve module are generally of housing, and this housing has fuel tank connecting portion and filter connection, institute State connecting portion and pass to fuel tank or pass to the pipeline of active carbon filter and be connected.The housing of described valve cell or valve module is extremely It is made from multiple components less, therefore despite the presence of the sealing of seam, but still cannot ensure absolutely sealing.Corresponding situation It is also applied for the fuel tank connecting portion of housing and filter connection and passes to fuel tank or pass to the pipeline of active carbon filter Between connection, therefore can not reliably stop a small amount of volatile hydrocarbon (HC) to escape from valve cell or valve module Go out.In the case of fuel tank stop valve and two fuel tank pressure regulation valves separate, the fluid carbon escaped from described valve The amount of hydrogen compound (HC) may be bigger due to large number of seam and connecting portion.

Because for avoiding fuel draining increasingly severeer, it can thus be anticipated that arrive, in the future to the law regulation in environment May no longer allow even small amount of volatile hydrocarbon (HC) the most described type device valve in escape.

Summary of the invention

Therefore, it is an object of the invention to, so improve the device starting described type so that can reduce by this device Each valve escape into the amount of the volatile hydrocarbon in environment.

According to the present invention, this purpose so realizes so that at least two fuel tank pressures regulation valves and the most not only Two fuel tank pressures regulation valves and fuel tank stop valve are all disposed within the inside of fuel tank.The present invention is contemplated that, passes through Each valve is arranged on fuel tank interior so that the volatile hydrocarbon escaped from these valves arrives the fuel tank closed And do not enter in environment.Now need not research and develop new valve, because existing valve has been by the material insensitive to fuel vapo(u)r Material is made.

The first alternative arrangement according to the present invention, fuel tank stop valve and two fuel tank pressures regulation valve unlike before that Sample forms unique valve cell or valve module, but fuel tank stop valve and two fuel tank pressure regulation valves are pacified apart from each other Dress, i.e. fuel tank stop valve are arranged on fuel tank and two fuel tank pressure regulation valves are arranged on fuel tank interior.

In this case, the fuel tank stop valve being positioned at fuel tank advantageously passes through at fuel tank as in the past The outside pipeline extended is connected with the active carbon filter being similarly positioned in fuel tank, and two fuel tank pressure regulation valves Preferably pipeline and the pipeline passing to active carbon filter from fuel tank stop valve by drawing from fuel tank is connected, or makees For replacing, directly it is connected with active carbon filter, such as when this active carbon filter is directly installed on fuel tank.

The fuel tank pressure regulation valve that two are arranged in fuel tank interior be advantageously arranged in fuel tank the gas compartment or In headroom, the described gas compartment or headroom are not filled with fuel when fuel tank refuelling.But, the two fuel Case pressure-regulating valve does not directly connect with the gas compartment or headroom, but by so-called liquid trap device phase Connection, utilize this liquid trap device can by the fuel of liquid such as condensate before the excess pressure valve opened of arrival from passing through overvoltage Valve effluent air mixture is separated, thus the fuel of liquid to before incidentally being entered in active carbon filter all Accumulate in excess pressure valve.

The two fuel tank pressure regulation valve is combined as a valve cell or valve module the most in parallel, described valve cell or Valve module has a public entrance or fuel tank connecting portion and public outlet or a filter connection, the most advantageously, Described entrance is connected with liquid trap device, and described outlet is connected with the pipeline drawn from fuel tank.The two fuel tank pressure Force regulating valve is preferably purely mechanic valve, and described purely mechanic valve is respectively provided with two chambers separated by diaphragm, wherein These chambers are connected with the pipeline drawn from fuel tank pairs by entrance and liquid trap device or by outlet respectively.

According to the another kind of preferably alternative arrangement of the present invention, the pressure in fuel tank is such at electromotor not only like the past Under idle state and also regulate only by two fuel tank pressure regulation valves during electromotor works, and fuel tank Stop valve remains turned-off in the work of electromotor, and only opens when fuel tank refuelling.It is arranged in the combustion of fuel tank Hopper stop valve advantageous by a pipeline and fuel tank the gas compartment or headroom is connected or with and fuel tank The liquid trap device of the gas compartment or headroom connection is connected, and wherein this pipeline preferably extends at fuel tank, and It is passed through in the gas compartment or headroom or in liquid trap device by the closing cap of the opening on the upside of fuel tank.Because machine Motor-car is in all the time when refuelling on a flat face, so can not use the gas space being positioned at fuel tank in this case Between or headroom and this pipeline between at least one rollover safety valve.

But alternatively, it is also possible to during electromotor works, as in the past, so regulate combustion by fuel tank stop valve Pressure in hopper, it may be assumed that when the pressure in the fuel tank recorded by fuel tank pressure sensor beyond predetermined overvoltage threshold or When person is less than predetermined low pressure threshold, this fuel tank stop valve opened by pulse excitation formula ground/clock drivingly (getaktet).? Carried out the control of fuel tank stop valve by a control device, the engine controller of preferred engine under both of these case. But, because the situation that fuel tank stop valve is opened just when motor vehicles has an accident, institute can not be got rid of in this case It is necessary with at least one rollover safety valve between the gas compartment of fuel tank or headroom and described pipeline.

All pacify according to preferred second alternative arrangement of the present invention, fuel tank stop valve and two fuel tank pressure regulation valves It is contained in the gas compartment or the headroom of fuel tank, and they preferred compositions are unique valve cell or valve module.With before First alternative arrangement of the present invention described is compared, and the advantage of this alternative arrangement of the present invention is, even if ending from fuel tank The fuel vapo(u)r of valve effusion also will not arrive in environment, but slightly larger to the space requirement of fuel tank interior.Here, by two Individual fuel tank pressure regulation valve and fuel tank stop valve composition valve cell or valve module the most not with the gas compartment or top Space, portion directly connects, but in communication by liquid trap device, utilizes this liquid trap device can be by liquid fuel Before arriving valve cell or valve module or active carbon filter from from the gas compartment or headroom through valve cell or valve group Part flows to separate in the admixture of gas of active carbon filter, thus on the one hand will not be in the internal shape of valve cell or valve module Becoming the accumulation of condensate, on the other hand the fuel of liquid is not attached in active carbon filter together.

No matter the position of fuel tank stop valve is how, and the basic structure of the fuel tank pressure regulation valve of machinery is identical: Each fuel tank pressure regulation valve advantageously surrounds two chambers separated by diaphragm, and one of them chamber is connected with fuel tank Portion connects, and another connects with filter connection.Diaphragm has opening, and is pressed against adapter by spring around this opening On free end, this adapter run through chamber in the lump by described opening be passed through described chamber another in, wherein spring position In this another chamber.Between two chambers and fuel tank connecting portion or filter connection be connected in excess pressure valve and Being contrary respectively in low pressure valve: in excess pressure valve, the chamber around adapter connects with fuel tank, and is equipped with the chamber of spring Connect with active carbon filter.When occurring the overvoltage opening pressure beyond excess pressure valve in fuel tank, diaphragm is due to described overvoltage The power overcoming spring is left from adapter, and therefore two chambers are connected to each other.In low pressure valve, it is equipped with chamber and the fuel of spring Case connects, and connects around the chamber taken over active carbon filter.Pressure is opened when fuel tank occurs more than low pressure valve During low pressure, diaphragm overcomes the power of spring to leave from adapter due to described low pressure, and therefore two chambers are connected to each other equally.

Accompanying drawing explanation

The present invention is explained further below according to the some embodiments shown in accompanying drawing.Accompanying drawing illustrates:

Fig. 1 schematically shows to have and ventilates and the fuel tank of air interchanger, and described ventilation and air interchanger have and be positioned at The fuel tank stop valve of fuel tank and two fuel tank pressure regulation valves being positioned at fuel tank interior；

Fig. 2 schematically shows the fuel tank with modified ventilation and air interchanger, described modified ventilation and Air interchanger has equally and is positioned at the fuel tank stop valve of fuel tank and two fuel tank pressures being positioned at fuel tank interior Regulation valve；

Fig. 3 is the perspective view of fuel tank stop valve；

Fig. 4 is the sectional view of two fuel tank pressure regulation valves；

Fig. 5 schematically shows has another kind of modified ventilation and the fuel tank of air interchanger, and wherein fuel tank cuts Only valve and two fuel tank pressure regulation valves are all located at fuel tank interior.

Reference numerals list:

1 fuel tank

2 fuel tank caps

3 fuel filler tubes

Bottom 4

5 supply units

6 petrolifts

7 active carbon filters

8 fuel tank stop valves

9 excess pressure valves

10 low pressure valves

11 liquid trap devices

12 rollover safety valves

13 rollover safety valves

14 rollover safety valves

15 engine controllers

16 valve members, fuel tank stop valve

17 valve actuated components, fuel tank stop valve

18 fuel tank connecting portions, fuel tank stop valve

19 filter connection, fuel tank stop valve

20 pipelines

21 pipelines

22 valve cells or valve module

23 headrooms or the gas compartment

24 closing caps

25 fuel tank connecting portions, valve cell or valve module

26 filter connection, valve cell or valve module

27 pipelines

28 pipelines

29 diaphragms

30 chambers

31 overvoltage chambers

32 low-pressure chamber

33 chambers

34 openings

35 adapters

36 springs

37 fuel tank pressure sensor

38 valve cells or valve module

39 fuel tank connecting portions, valve cell or valve module

40 filter connection, valve cell or valve module

41 pipelines

42 pipelines

43 OBD pipelines

Detailed description of the invention

The fuel tank 1 of the motor vehicles shown in accompanying drawing is the fuel tank 1 sealed, and it is by the interlayer material of gas and liquid seal Material is made by blow molding.Fuel tank 1 has the fuel filler tube 3 can closed by fuel tank cap 2, in order to refuelling.Have The supply unit 5 of the petrolift 6 being immersed in fuel is positioned near the bottom 4 of fuel tank 1.Fuel tank 1 is equipped with ventilating and changing Device of air, this ventilation and air interchanger include active carbon filter 7,8, two fuel tank pressures of fuel tank stop valve regulation valves 9, 10, liquid trap device 11 and the most one or more rollover safety valve 12,13,14.

It is arranged in the active carbon filter 7 outside fuel tank 1 and stops volatile Hydrocarbon when fuel tank 1 ventilates (HC) arriving in environment, for this purpose it is proposed, active carbon filter 7 comprises the implant being made up of activated carbon, this implant absorbs waves The Hydrocarbon (HC) of the property sent out.When active carbon filter 7 is mounted with volatile Hydrocarbon, by by surrounding air In active carbon filter 7 sucks the suction stroke (not shown) of electromotor, filter 7 is washed away and makes volatility Hydrocarbon is in the burning Indoor Combustion of electromotor, it is possible to make filter regeneration.

In the fuel tank 1 shown in Fig. 1 and 2, it is outside that fuel tank stop valve 8 is arranged in fuel tank 1, and two fuel tank pressures It is internal that force regulating valve 9,10 is arranged in fuel tank 1.

Fuel tank stop valve 8 is electromagnetic valve, it is normally closed, it is possible at the engine controller 15 of electromotor Open with controlling lower pulse excitation formula.As most preferably figure 3 illustrates, fuel tank stop valve 8 includes that valve member 16 and valve cause Dynamic component 17.Valve member 16 includes valve seat and the valve element (not shown) movable relative to valve seat and fuel tank connecting portion 18 He Filter connection 19.Valve actuated components 17 includes solenoid and the armature (not shown) acted on valve element.Work as electromagnetism When coil is activated, armature makes valve element leave from valve seat/lift, and therefore two connecting portions 18,19 communicate with each other.As most preferably Ground illustrates in fig 1 and 2, and fuel tank connecting portion 18 is by the pipeline 20 extended outside fuel tank 1 and the inside of fuel tank 1 Connect, and filter connection 19 is connected with active carbon filter 7 by the same pipeline 21 extended outside fuel tank 1.

Two fuel tank pressure regulation valves 9,10 are purely mechanic excess pressure valve 9 and purely mechanic low pressure valve 10, excess pressure valve 9 He Low pressure valve 10 is combined as a valve cell or valve module 22 in parallel.Valve cell or valve module 22 are placed in being positioned at of fuel tank 1 In the highest headroom above fuel plane or the gas compartment 23, wherein valve cell or valve module 22 are preferably mounted at closing On lid 24 or near closing cap 24, this closing cap 24 close on the upside of fuel tank 1 in opening, thus when needed can be relatively easily Close to this opening.Valve cell or valve module 22 have fuel tank connecting portion 25 and filter connection 26.Pipeline 27 is from fuel tank Connecting portion 25 extends to liquid trap device 11 through fuel tank 1 is internal, and pipeline 28 extends from filter connection 26 always To pipeline 21, this pipeline 28 is passed through in this pipeline 21 after fuel tank stop valve 8.

As most preferably figure 4 illustrates, two fuel tank pressure regulation valves 9,10 are respectively provided with two by diaphragm 29 The chamber 30,31 separated；32,33, one of them chamber 31；32 connect with fuel tank connecting portion 25, and another chamber 30； 33 connect with filter connection 26.The diaphragm 29 of each valve 9,10 is respectively provided with opening 34, and when valve 9,10 cuts out around opening Mouth 34 abuts in the adapter 35 of tubular, is connected with fuel tank 1 by this adapter 35 at low pressure valve 10 mesolow chamber 32, and Described in excess pressure valve 9, another chamber 30 is connected with active carbon filter 7 by this adapter 35.Diaphragm 29 is pressed against by spring 36 On the upper free end of adapter 35, and it is responsible for making two chambers 30,31；32,33 when valve 9,10 cuts out, that is generally In the case of do not connect.When the pressure in fuel tank 1 drops to when opening below pressure of low pressure valve 10, the diaphragm of low pressure valve 10 29 overcome spring 36 due to the low pressure in the low-pressure chamber 32 that connected with fuel tank connecting portion 25 with adapter 35 by opening 34 Power leave from adapter 35, therefore two chambers 32,33 are connected to each other in the case of valve 10 is opened.When the pressure in fuel tank Being increased to when opening more than pressure of excess pressure valve 9, the diaphragm 29 of excess pressure valve 9 overcomes spring due to the pressure in overvoltage chamber 31 The power of 36 is left from adapter 35, and therefore two chambers 30,31 are the most also connected to each other in the case of valve 9 is opened.

It is arranged in the liquid trap that in the gas compartment of fuel tank 1 or headroom and fuel tank 1 upside is adjacent Device 11 should stop, and when fuel tank 1 ventilates, the fuel of liquid is incidentally entered from the internal admixture of gas flowed out of fuel tank 1 In active carbon filter 7.Such as when motor vehicles is in undue obliquity in accident or the time of tumbling, overturning safety Valve 12,13,14 should stop liquid fuel to leak from fuel tank 1.Liquid trap device 11 or rollover safety valve 12,13,14 Structure is known per se, therefore without repeating.

In the fuel tank 1 shown in Fig. 1, fuel tank stop valve 8 is connected with liquid trap device 11 by pipeline 20.Sending out During motivation work, when the pressure in the fuel tank 1 recorded by fuel tank pressure sensor 37 is beyond the overvoltage threshold that can set Time or less than can set low pressure threshold time, there fuel tank stop valve 8 by engine controller 15 pulse of electromotor Open excitation formula.And when electromotor does not works, the pressure within fuel tank 1 by means of two fuel tank pressures regulation valves 9, 10 are maintained in predetermined pressure limit, and the upper limit of this pressure limit is slightly above overvoltage threshold, and its lower limit is slightly below low pressure threshold Value.The pressure of opening of excess pressure valve 9 corresponds to the upper limit of this predetermined pressure limit, therefore such as exists when the pressure in fuel tank 1 Fuel vaporization within fuel tank 1 when ambient temperature raises or during after heat stage after the engine is shut off and reach or During beyond the upper limit of this predetermined pressure range, excess pressure valve 9 automatically opens up.The pressure of opening of low pressure valve 10 corresponds to described pre-level pressure The lower limit of power scope, therefore when the such as pressure in the fuel condensation of fuel tank interior and fuel tank 1 when ambient temperature reduces Therefore, time at or below the lower limit of described predetermined pressure range, low pressure valve 10 automatically opens up.When fuel tank stop valve 8 is opened Or from fuel tank 1, effluent air mixture is directed to live by pipeline 21 or pipeline 21 and 28 when excess pressure valve 9 is opened Property carbon filter 7, in order to absorb the volatile hydrocarbon (HC) that is included in admixture of gas, the most cleaned sky Gas arrives in environment.

In contrast to this, in the fuel tank 1 shown in Fig. 2, fuel tank stop valve 8 remains turned-off when electromotor works, and Only open when fuel tank 1 refuelling.Pressure within fuel tank 1 only by means of two mechanical fuel tank pressures regulation valves 9, 10 are maintained in predetermined pressure limit.This pressure limit is upwards limited by the overvoltage threshold determined by the design of excess pressure valve 9, Limited by the low pressure threshold determined by the design of low pressure valve 10 downwards.When the pressure in fuel tank 1 reaches or beyond overvoltage threshold During value, excess pressure valve 9 automatically opens up.When the pressure in fuel tank 1 is at or below low pressure threshold, low pressure valve 10 automatically opens up. This pressure limit is kept as relative narrower, thus fuel tank 1 is not subject to peak load.Here, lead to combustion from fuel tank stop valve 8 The pipeline 20 of hopper is not to be passed through in liquid trap device 11 but is passed directly into the gas compartment or the headroom 23 of fuel tank 1 In.Because motor vehicles is always positioned at when refuelling in a flat substrate, so this fuel tank 1 or this working method are come Saying at least one that can not use in rollover safety valve 12,13,14, this is by saving liquid trap device 11 He in fig. 2 Rollover safety valve 12 between the gas compartment or headroom 23 represents.

In the fuel tank 1 shown in Fig. 5, fuel tank stop valve 8 and two fuel tank pressure regulation valves 9 are arranged together with 10 Inside fuel tank 1.Fuel tank stop valve 8 and two fuel tank pressure regulation valves 9 and 10 are combined as a valve cell there Or valve module 38, two of which fuel tank pressure regulation valve 9 and 10 is arranged as bypass valve and fuel tank stop valve 8 is in parallel. Described valve cell or valve module 38 have public fuel tank connecting portion 39 and a public filter connection 40.Fuel tank Connecting portion 39 is connected with liquid trap device 11 by the pipeline 41 extended inside fuel tank 1, and filter connection 40 leads to Cross the pipeline 42 drawn from fuel tank 1 to be connected with active carbon filter 7.

As it was previously stated, can be by all being carried out by fuel tank pressure regulation valve 9 and 10 when electromotor does not works and works Pressure regulates and makes fuel tank stop valve 8 the most only open when fuel tank 1 refuelling, or fuel tank stop valve 8 can To be also used for pressure regulation when electromotor works.

In all fuel tanks 1, fuel filler tube 3 is connected with liquid trap device 11 by OBD pipeline 43, because of This can detect the fault of fuel tank cap 2, in order to stops the Hydrocarbon effusion by fuel filler tube 3 and pressure compensation. Owing to not havinging overvoltage or low pressure inside fuel tank 1 when fuel tank cap 2 fault, therefore can be by analyzing and processing fuel The signal of case pressure transducer 37 detects the fault of fuel tank cap 2.

Claims (9)

1. for the ventilation of fuel tank and the device for ventilation of electromotor, the active carbon filter of described device, controlled Fuel tank stop valve and two fuel tank pressures regulation valves, one in described fuel tank pressure regulation valve at described fuel tank In for low pressure time open, and another in described fuel tank for overvoltage time open, wherein said two fuel tank pressures regulation It is internal that valve (9,10) is arranged in described fuel tank (1), and described fuel tank pressure regulation valve (9,10) is by being used for isolating liquid The liquid trap device (11) of fuel connects with the gas compartment (23) of described fuel tank (1), described active carbon filter (7) and Described fuel tank stop valve (8) is arranged in described fuel tank, described fuel tank stop valve (8) by a pipeline (20) around Cross in the case of liquid trap device (11) gas compartment (23) with described fuel tank (1) to be directly connected to.

Device the most according to claim 1, it is characterised in that said two fuel tank pressure regulation valve (9,10) is in parallel Be combined as a valve cell or valve module (22), this valve cell or valve module (22) have a public fuel tank connecting portion (25) and One public filter connection (26).

Device the most according to claim 1 and 2, it is characterised in that be provided with from said two fuel tank pressure regulation valve (9, 10) pipeline (28) drawn from described fuel tank (1), described pipeline (28) be passed through after described fuel tank stop valve (8) from Described fuel tank stop valve (8) passes in the pipeline (21) of described active carbon filter (7) or is passed through described active carbon filter (7) in.

Device the most according to claim 1 and 2, it is characterised in that said two fuel tank pressure regulation valve (9,10) exists It is arranged on the highest fuel plane in the gas compartment (23) of described fuel tank (1).

Device the most according to claim 1, it is characterised in that between the described gas compartment (23) and described pipeline (20) It is not disposed with rollover safety valve.

Device the most according to claim 1 and 2, it is characterised in that described liquid trap device (11) passes through at least one Rollover safety valve (12,13,14) is connected with the gas compartment (23).

Device the most according to claim 1 and 2, it is characterised in that when electromotor works, described fuel tank stop valve (8) remain turned-off, and control the pressure in described fuel tank (1) only by means of said two fuel tank pressure regulation valve (9,10) Power.

Device the most according to claim 1 and 2, it is characterised in that said two fuel tank pressure regulation valve (9,10) is Purely mechanic valve, described purely mechanic valve is respectively provided with two chambers (30,31 separated by diaphragm (29)；32,33), institute State chamber (30,31；32,33) respectively the most in couples with the inside of described fuel tank (1) or be connected with described active carbon filter (7) Logical.

Device the most according to claim 1 and 2, it is characterised in that the described gas compartment (23) is headroom.