DE102017011169A1 - vehicle - Google Patents

Abstract

The invention relates to a vehicle, comprising an internal combustion engine and a container installation space (R), arranged for the arrangement of a reservoir provided for the storage of a urea solution of a reduction apparatus for the selective catalytic reduction of nitrogen oxides in exhaust gases. According to the invention, a fuel tank arrangement (1) which is fluidically coupled to the internal combustion engine is provided. The fuel tank arrangement (1) comprises a fuel tank (2), an activated charcoal container (3) fluidically coupled to the fuel tank (2) for storing evaporated fuel from the fuel tank (2) and a pressure compensation tank (4) fluidically coupled at least to the fuel tank (2) ) with an expansion volume (4.1) arranged in the interior and formed from an elastic bubble, wherein the pressure compensation container (4) is arranged in the container construction space (R).

Description

The invention relates to a vehicle according to the preamble of claim 1.

From the DE 10 2010 021 584 A1 a fuel vapor recovery system for a plug-in hybrid vehicle is known. The fuel vapor recovery system includes a fuel tank that is vented to a passageway configured to carry fluid, with the passageway venting to the atmosphere. The fuel vapor recovery system further includes a carbon canister, a bladder, and a shut-off valve, wherein the carbon canister, bladder, and shut-off valve are fluidly connected to the passage and arranged in series in the passage. In this case, the shut-off valve is located at an atmospheric end of the passage. Furthermore, the fuel vapor recovery system comprises a rigid bladder mount in which the bladder is disposed, the bladder mount having a port leading to the atmosphere and the bladder support fluidically separated from the passage. The bubble holder is arranged in the fuel tank.

Furthermore, vehicles with exhaust aftertreatment systems are generally known from the state of the art, wherein the exhaust aftertreatment systems each comprise a reduction apparatus for selective catalytic reduction (SCR). By means of such a reduction device, a reduction of nitrogen oxides in exhaust gases of an internal combustion engine of a vehicle is performed, wherein urea is supplied to the exhaust gas in the form of a urea solution (e.g., AddBlue, an about 33 percent solution of urea in water). For storing the urea solution, the vehicles each comprise a storage container, which is arranged in a space provided for this purpose of the vehicle.

The invention is based on the object to provide a comparison with the prior art improved vehicle.

The object is achieved with a vehicle having the features specified in claim 1.

Advantageous embodiments of the invention are the subject of the dependent claims.

The vehicle comprises an internal combustion engine and a construction space, arranged for the arrangement of a reservoir provided for the storage of a urea solution of a reduction device for the selective catalytic reduction of nitrogen oxides in exhaust gases.

According to the invention, the vehicle comprises a fuel tank arrangement which is fluidically coupled to the internal combustion engine. The fuel tank assembly comprises a fuel tank, an activated charcoal canister fluidically coupled to the fuel tank for storing evaporated fuel from the fuel tank and a surge tank fluidly coupled at least to the fuel tank with an expansion volume disposed inside and formed of an elastic bladder, the surge tank being disposed in the tank space is. The bladder may e.g. be empty and in a flaccid state in the surge tank. The bubble can then be filled by evaporated fuel and is inflated. But the bubble can already z.T. filled with a gas and partially inflated. The bubble is then further inflated by incoming evaporated fuel. The evaporated fuel must then act against the existing gas pressure.

• - signifikante Kosteneinsparungen,
• - ein geringeres Gewicht,
• - eine verbesserte Volumeneffizienz bei gleichem Bauraum,
• - die Möglichkeit einer Verwendung eines einfacheren Be- und Entlüftungssystems, beispielsweise aufgrund eines Entfalls eines Schwerkraftventils, und
• - eine Verringerung von Druckabbauzeiten und damit verbundenen Wartezeiten einer Befüllung des Kraftstoffbehälters während eines Tankvorgangs.

The use of the surge tank downstream of the fuel tank allows the use of a pressureless fuel tank in a plug-in hybrid vehicle, so that during an electrical driving operation of the vehicle, for example, caused by changes in temperature volume changes of evaporated fuel can be compensated. This results in comparison with a use of a pressure tank, ie a sealed to the atmosphere fuel tank,

• - significant cost savings,
• a lower weight,
• an improved volume efficiency with the same installation space,
• - the possibility of using a simpler ventilation system, for example, due to a loss of a gravity valve, and
• - A reduction of pressure reduction times and associated waiting times of a filling of the fuel tank during a refueling operation.

The arrangement of the surge tank in the container space allows for a production of the vehicle increased use of common parts and the use of a common vehicle platform for different types of drives, such as diesel engines and plug-in hybrid drives.

Embodiments of the invention will be explained in more detail below with reference to a drawing.

• 1 schematisch ein Blockschaltbild einer Kraftstofftankanordnung für ein Plug-in-Hybrid-Fahrzeug.

Showing:

• 1 schematically a block diagram of a fuel tank assembly for a plug-in hybrid vehicle.

In the only one 1 is a block diagram of a fuel tank assembly 1 for a plug-in hybrid vehicle with an internal combustion engine and an electric drive, not shown. Furthermore, the vehicle comprises a container space R , arranged for the arrangement of a reservoir provided for the storage of a urea solution of a reduction device for the selective catalytic reduction of nitrogen oxides in exhaust gases.

For operation of the internal combustion engine includes the fuel tank assembly 1 a fuel tank 2 with a pressure sensor 2.1 , Furthermore, the fuel tank assembly comprises 1 one with the fuel tank 2 fluidically coupled charcoal canister 3 with a shut-off valve 3.1 for storing evaporated fuel from the fuel tank 2 to prevent evaporative emissions of fuel to the atmosphere. For this purpose, the fuel tank includes 2 a valve 2.2 , which is to maintain a maximum level and to vent the fuel tank 2 is controllable. About this valve 2.2 is the fuel tank 2 by means of a first line 5 with the activated carbon container 3 coupled to the input of a fuel tank isolation valve 6 is arranged to limit the pressure. The pressure limitation takes place, for example, to a value of about 25 hPa.

The evaporated fuel is in the charcoal canister 3 stored until it is burned by the internal combustion engine. In a purely electric driving of the vehicle, however, this combustion is not possible.

However, to avoid evaporative emissions without the use of a pressurized tank, ie, a fuel tank sealed to the atmosphere, the fuel tank assembly includes 1 one with the fuel tank 2 fluidically coupled surge tank 4 , which in the container space R is arranged. Here is the pressure equalization tank 4 parallel with the fuel tank 2 and the charcoal canister 3 interconnected and is with a regeneration valve 7 coupled to the regeneration of the activated carbon and allows, for example, a compensation of temperature changes caused by volume changes of evaporated fuel.

A behavior of gases inside the fuel tank 2 can be described in a good approximation with the ideal gas equation. That is, a product of pressure P and volume V behaves proportionally to the temperature T according to: $$\text{P}*\text{V}~\text{T}\text{,}$$

konstant.At constant temperature, the product of pressure P and volume V is also according to $$\text{P}*\text{V}=\text{const}$$

constant.

The pressure equalization tank 4 comprises an expansion volume arranged inside and formed of an elastic bubble 4.1 , which in the case already partially filled with a gas and thus partially inflated. The bladder is, for example, a flexible, emission-tight bag made of a barrier film, wherein the barrier film is at least partially formed of an ethylene-vinyl alcohol copolymer. Also, the bladder may comprise a barrier film comprising a layer construction having a first layer formed of polypropylene, a second layer formed of ethylene-vinyl alcohol copolymer, and a third layer formed of polyethylene.

About the first line 5 and a fluidically coupled with this second line 8th is the inside of the surge tank 4 also over the valve 2.2 with the fuel tank 2 fluidly coupled, so that in particular when the fuel tank isolation valve is closed 6 evaporated fuel into the interior of the surge tank 4 can be led and the expansion volume 4.1 depending on one inside the surge tank 4 ruling pressure changes its volume.

Assuming that at sea level a differential pressure of 300 hPa corresponds approximately to a volume difference of 30%, taking into account the equations (1) and (2) described above results in an expansion volume 4.1 of 60 liters a change of 18 liters.

Become both a capacity of the activated carbon container 3 as well as a capacity of the surge tank 4 Exceeded excess fuel is vaporized via a vent line 9 which is in a vent 10 on a tank filler neck 11 flows, discharged.

In the event of a rollover of the vehicle, an occurrence of fuel from the fuel tank 2 To avoid this includes two so-called roll-over valves 2.3 . 2.4 equipped with an operating bleeder shut-off valve 12 are coupled.

By means of the illustrated fuel tank assembly 1 Furthermore, a leak test of the same is feasible in a simple manner. This is done by means of a diagnostic module 4.2 of the surge tank 4 a pressure build-up inside the surge tank 4 and thus a direct evaluation of a gas space formed by the interior. Due to the pressure build-up within this gas space, the expansion volume deforms 4.1 , allowing overpressure in the remaining components of the fuel tank assembly 1 constructed and by means of the pressure sensor 2.1 of the fuel tank 2 can be evaluated. By means of an actuation of the fuel tank isolation valve 6 can do a separate test of the expansion volume 4.1 and the activated carbon container 3 be performed.

LIST OF REFERENCE NUMBERS

1

Fuel tank arrangement

2

Fuel tank

2.1

pressure sensor

2.2

Valve

2.3

Roll-over valve

2.4

Roll-over valve

3

Activated charcoal

3.1

shut-off valve

4

Surge tank

4.1

expansion volume

4.2

diagnostic module

5

management

6

Fuel tank isolation valve

7

regenerating

8th

management

9

vent line

10

vent

11

filler neck

12

Betriebsentlüftungsabsperrventil

R

container space

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102010021584 A1 [0002]

Claims (3)

A vehicle, comprising - an internal combustion engine and - a container installation space (R), arranged for arranging a reservoir of a reduction device for storing a urea solution for the selective catalytic reduction of nitrogen oxides in exhaust gases, characterized by a fuel tank arrangement (1) fluidly coupled to the internal combustion engine, comprising - a fuel tank (2), - with the fuel tank (2) fluidly coupled activated carbon container (3) for storing evaporated fuel from the fuel tank (2) and - at least with the fuel tank (2) fluidly coupled pressure equalization tank (4) an expansion volume (4.1) arranged in the interior and formed from an elastic bubble, wherein - the pressure compensation container (4) in the container space (R) is arranged. Vehicle after Claim 1 , characterized in that the bladder comprises a barrier layer film, wherein the barrier layer film is at least partially formed of an ethylene-vinyl alcohol copolymer. Vehicle after Claim 1 or 2 , characterized in that the bubble comprises a barrier film, wherein the barrier film comprises a layer structure - having a first layer formed from polypropylene, - a second layer formed from ethylene-vinyl alcohol copolymer and - a third layer formed from polyethylene.

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