Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
  • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
  • F02M25/0854—Details of the absorption canister
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
  • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
  • F02M2025/0881—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir with means to heat or cool the canister

Definitions

• Tank ventilation device motor vehicle, method for controlling a fuel mixture composition and control device therefor Description
• the present invention relates to a tank ventilation device for introduction between a fuel tank and an internal combustion engine, a motor vehicle comprising such a tank ventilation device, a method for controlling a fuel mixture composition for an internal combustion engine, and a control device for carrying out the method.
• Tank ventilation devices are known in different embodiments from the prior art.
• tank venting devices are disposed between an internal combustion engine and a fuel tank and include a fuel reservoir containing an activated carbon bed.
• the activated carbon bed is provided to receive from the fuel tank, in particular by temperature and / or pressure, in the fuel storage overflowing fuel and store.
• Corresponding sensors provided in the activated carbon bed indicate when the activated carbon bed is saturated with fuel. If this is the case, a venting is initiated and the fuel storage with flushing gas, in particular fresh air from the environment, rinsed. The thereby expelled from the activated carbon bed fuel is supplied in the form of a fuel-air mixture combustion engine for fuel combustion.
• a disadvantage of conventional tank ventilation devices is that any disturbances during the venting process, for example, an additional violation of fuel from the fuel tank, can not be taken into account in the mixture control for fuel combustion. Rather, a readjustment of the mixture composition From fuel and fresh air take place only after passing the exhaust gas of the internal combustion engine to a lambda probe in the exhaust path, by means of which the current quality of the fuel mixture is determined. This leads to engine speed fluctuations, a loss of purge gas for the activated carbon bed regeneration and thus to an unsteady performance of the combustion engine.
• a tank ventilation device by means of the fuel storage aeration (fuel storage regeneration) can be made a fuel mixture control, which is adapted to the current, expelled from the fuel storage total fuel amount, so that one for the internal combustion engine optimized fuel mixture can be formed.
• a motor vehicle which is characterized by an optimal fuel mixture formation due to minimized engine speed fluctuations and thus by a constant good driving dynamics.
• a method for controlling a fuel mixture composition for an internal combustion engine, and a control device for it, by means of the engine speed fluctuations in the venting operation of a fuel storage prevented and fuel mixture formation can be optimized.
• the object is achieved in a tank ventilation device for introduction between a fuel tank and an internal combustion engine according to the invention in that the tank ventilation device
• thermocouple is arranged in the fuel storage in a direct flow path of the fuel between the fuel line and the vent line.
• the thermocouple is arranged in a direct flow path, that is to say in a region of the activated carbon bed which is located between the fuel line and the vent line and is set up, a temperature increase in the activated carbon bed which is caused by a fuel loading front from the fuel tank during the venting process of the fuel reservoir, is initiated to measure.
• thermocouple is in the direct flow path, preferably provided on the half or 2/3 of the distance between the fuel line and vent line, so that a sufficient pilot time is obtained.
• the additional amount of fuel from the fuel tank which could previously be determined as a disturbance only after combustion of the fuel mixture in the internal combustion engine when passing the lambda probe, determined before entering the internal combustion engine and a fuel mixture control svorgangs done before the initiation of combustion.
• the mixture is no longer regulated on suspicion of the tank vent line, but can be adjusted specifically to the respective engine requirements. As a rule, this leads to an increase in the purge gas for the activated carbon bed regeneration and thus to a reliable fulfillment of the legal limit values for Hydrocarbon evaporation emissions and also to reduce a fuel odor risk.
• the ventilation line comprises a ventilation valve by means of which a quantity of purge gas for purging the fuel accumulator during the venting process is selectively controllable.
• the vent line comprises a tank vent valve.
• thermocouple is arranged in the activated carbon bed of the fuel storage, so that a possible increase in temperature by an approaching load front can be detected safer and more accurate.
• the tank ventilation device further comprises at least one further thermocouple or at least one temperature sensor, which is disposed outside the direct flow path of the fuel between the fuel line and the vent line.
• a motor vehicle which comprises a tank venting device as set forth above.
• the motor vehicle is characterized by the pre-controlled fuel mixture formation by stable engine speeds and thus due to a high ride comfort and good driving dynamics. An odor risk due to escaping fuel is minimized. Legally prescribed limits for fuel emission are reliably met.
• a method for controlling a fuel mixture composition for an internal combustion engine with a tank ventilation device during venting or venting of a fuel reservoir is also described.
• the tank ventilation device is inserted between a fuel tank and an internal combustion engine and comprises
• venting line for supplying purge gas into the fuel reservoir, the venting line preferably comprising a venting valve
• a fuel line for transporting fuel from a fuel tank connected to the tank ventilation device into the fuel reservoir
• vent line for the transport of gases from the fuel tank to an internal combustion engine, wherein in the vent line preferably a tank vent valve is provided, and
• thermocouple which is arranged in the fuel storage, in a direct flow path of a fuel between the fuel line and the vent line.
• the loading of the activated carbon bed with fuel, which has accumulated in particular by pressure and temperature fluctuations or by performing a refueling process, in the activated carbon bed is determined.
• the temperature T 0 is determined by means of the thermocouple in the direct flow path of the fuel between the fuel line and the vent line.
• the thermocouple is preferably arranged on the half or 2/3 of the direct flow path, ie the distance between the fuel line and the vent line.
• the temperature Ti (or temperatures T n ) certainly.
• An advantageous development of the method provides that, depending on a height of the temperature Ti at time 1 more purge gas is passed through the fuel tank or an opening degree of the vent valve is reduced. Thus, since a temperature increase reflects the size of the fuel loading front from the fuel tank, even more efficient fuel mixture formation can be achieved.
• a control device in particular in a motor vehicle, which is suitable for carrying out a method as described above.
• an optimized fuel mixture control can be carried out in a simple manner during a venting process of the fuel accumulator.
• the motor vehicle according to the invention and the method according to the invention for controlling a fuel mixture composition for an internal combustion engine as The controller according to the invention also has the following advantages in particular:
• a fuel mixture composition takes place during the venting process of a fuel accumulator and independently of values determined in retrospect by a lambda probe.
• the fuel mixture composition is adjusted to the current engine requirements.
• Predefined fuel emission values can be complied with more easily.
• the motor vehicle is characterized by a high driving dynamics, good ride comfort and a stable performance.
• Figure 1 is a schematic view of a Tankentldivungsvortechnik according to a first embodiment of the invention and Figure 2 is a schematic view of a Tankentlflectungsvortechnik according to a second embodiment of the invention.
• FIG. 1 shows a tank ventilation device 1 according to a first advantageous development of the invention.
• the tank ventilation device 10 is in this case introduced between a fuel tank 1 and an internal combustion engine 3 and comprises a fuel reservoir 2 with an activated carbon bed for storing fuel, which is connected to the fuel tank 1 through a fuel line 4.
• the fuel storage 2 is connected to the fuel tank 1 opposite side with an internal combustion engine 3 by a Entlwestsleitu ng 5.
• the vent line 5 also includes a tank vent valve 7, by means of which an influx of fuel from the fuel tank 1 and / or the fuel reservoir 2 can be controlled.
• To the fuel tank 2 further includes a vent line 9, by means of the purge gas, ie in particular air from the environment of the tank venting device 10, can be introduced into the fuel tank 2.
• the introduction of purge gas and preferably also the amount of purge gas introduced can be regulated via the existing in the vent line 9 vent valve.
• the fuel line 4 and the vent line 5 are arranged on opposite sides of the fuel accumulator 2, so that there is a direct flow path 11 between the fuel line 4 and the vent line 5.
• a thermocouple 8 is introduced, which is preferably arranged in the activated carbon bed of the fuel reservoir 2.
• the vent valve 6 and the tank vent valve 7 are opened so that the vent line 5 between the fuel reservoir 2 and the internal combustion engine 3 is opened.
• negative pressure purge gas is sucked through the vent line 9 through the fuel tank 2.
• the purge gas absorbs the existing fuel in the fuel and leads him to the combustion in the internal combustion engine 3, which leads to a Regenerat ion of the activated carbon bed. Occurs now in the venting case of an accident, for example, by entry of additional fuel from the fuel tank 1 in the fuel tank 2, for example by mechanical action on the fuel tank 1, the forming load front of fuel via a temperature increase in the fuel tank 2 can be measured.
• the thermocouple 8 is provided, which is arranged in the direct flow path 11 between the fuel line 4 and the vent line 5, a region in which the loading front passes directly upon entry into the fuel storage.
• thermocouple 8 if a higher temperature is measured by the thermocouple 8 compared to before the beginning of the venting process, by supplying more purge gas through the vent line 9 and / or throttling the tank vent valve 7, a fuel mixture composition adapted to the needs of the internal combustion engine can be set. This usually leads to an increased flow of purge gas, which prevents odor nuisance after fuel and legally prescribed limits for fuel emission can be more easily met. An engine speed of the internal combustion engine 3 is thus stable.
• FIG. 2 shows an alternative embodiment to the tank ventilation device 10 from FIG.
• the vent line 5 and the fuel line 4 are provided at grappleinande r lying sides of the fuel reservoir 2 and are thus arranged orthogonally. This results in a changed direct flow path 1 1 between the fuel line 4 and the vent line fifth
• thermocouple 8 is arranged in the direct flow path 1 in turn.
• a temperature sensor 12 is provided in the activated carbon bed outside the direct flow path 1 1, by means of which a loading state of the activated carbon bed in the fuel storage 2 can be determined before the initiation of the venting process.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
• Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=51383731

Family Applications (1)

Country Status (4)

Citations (5)

Family Cites Families (4)

• 2013
  • 2013-09-25 DE DE102013219231.2A patent/DE102013219231A1/de not_active Withdrawn
• 2014
  • 2014-08-21 WO PCT/EP2014/067808 patent/WO2015043846A1/de active Application Filing
  • 2014-08-21 CN CN201480040901.1A patent/CN105408612B/zh not_active Expired - Fee Related
  • 2014-08-21 EP EP14753088.5A patent/EP3049664B1/de not_active Not-in-force

Patent Citations (5)

Also Published As

Similar Documents

Legal Events