JP4293012B2 - Exhaust gas purification device for internal combustion engine - Google Patents

Description

  The present invention relates to an exhaust emission control device for an internal combustion engine.

There is known an exhaust emission control device that stores a low boiling point component obtained by fuel fractionation in a tank and supplies the low boiling point component from an upstream side of a catalyst (see Patent Document 1). In addition, Patent Documents 2 and 3 exist as prior art documents related to the present invention.
Japanese Patent No. 2850547 Japanese Patent No. 3093905 JP 2001-193525 A

  In the conventional apparatus, since a part of the fuel stored in the fuel tank is always heated, there is a possibility of promoting the deterioration of the fuel. Moreover, there is a possibility that the operation of the internal combustion engine may be hindered by excessively fractionating low boiling point components from the fuel in the fuel tank to raise the fuel in the fuel tank to a high boiling point (heavy). Furthermore, wasteful operation of the fractionator reduces the energy efficiency of the internal combustion engine.

  Accordingly, the present invention provides an exhaust gas for an internal combustion engine that can secure a low-boiling point fuel that can be used for regenerating the function of an exhaust gas purification means such as a catalyst while suppressing the heaviness of fuel in the fuel tank and the deterioration of the energy efficiency of the internal combustion engine. An object is to provide a purification device.

An exhaust emission control device for an internal combustion engine according to a first aspect of the present invention includes a fractionation means for fractionating fuel supplied from a fuel tank of an internal combustion engine into a gas phase and a liquid phase, and a gas fractionated by the fractionation means. Gas-phase fuel storage means for storing the fuel in the phase, exhaust purification means disposed in the exhaust passage of the internal combustion engine and regenerating the function by temperature increase and / or air-fuel ratio control, and gas in the gas-phase fuel storage means A gas phase fuel supply means for supplying phase fuel to the exhaust gas purification means, and a regeneration timing estimation means for estimating a function regeneration time of the exhaust gas purification means; Fuel supply amount setting means for setting the amount of gas phase fuel supplied from the gas phase fuel supply means during function regeneration, storage amount acquisition means for acquiring the storage amount of the gas phase fuel storage means, and fuel supply amount setting means The amount of vapor fuel set by the A fractionation management means for managing the operation of the fractionation means based on the shortage amount of gas phase fuel estimated from the storage amount acquired by the quantity acquisition means and the function regeneration timing estimated by the regeneration timing estimation means; The fraction management means solves the above-mentioned problem by operating the fractionation means when it is determined that the time until the next function regeneration time is shorter than a predetermined determination time (claim). 1).

According to the first exhaust gas purification apparatus of the present invention, the fractionating means is appropriately operated according to the function regeneration timing of the exhaust gas purification means and the shortage amount of the gas phase fuel. Therefore, for example, only an amount of gas phase fuel necessary for function regeneration can be fractionated by the time of function regeneration of the next exhaust purification means, so that excessive fractionation of gas phase fuel can be suppressed. In addition, since the operation schedule of the fractionating means can be managed in this way, useless operation of the fractionating means can be eliminated. As a result, useless heating of the fuel is prevented, so that deterioration of the fuel can be suppressed. Furthermore, the energy efficiency of the internal combustion engine can be improved. In addition, since the fractionation means operates when it is determined that the time until the next function regeneration time is shorter than the predetermined determination time, the amount of vapor phase fuel necessary for the function regeneration is exhausted by the next function regeneration time. It can be ensured in the phase fuel storage means. Further, when there is time until the next function regeneration time, it is not necessary to operate the fractionation means, so that the operation time of the fractionation means can be reduced. The predetermined determination time includes, for example, if the fuel fractionation starts from this determination time, the amount of vapor phase fuel necessary for the function regeneration of the exhaust gas purification means is stored in the gas phase fuel storage means by the next function regeneration timing. The time that can be secured is set.

In the exhaust gas purification apparatus for a first internal combustion engine of the present invention, the fractionation means fractionates fuel using the exhaust heat of the internal combustion engine, and the fractionation management means supplies the fuel by the fractionation means. When it is determined that the temperature is raised to the target temperature, the fractionator may be operated (Claim 2). By operating the fractionating means in this way, it is possible to store only gas phase fuel having a desired property in the gas phase fuel storage means. In addition, the properties of the gas phase fuel can be stabilized. As the target temperature, for example, about 200 to 250 degrees is set. In the exhaust gas purification apparatus for a first internal combustion engine of the present invention, a target amount of vapor phase fuel to be stored in the vapor phase fuel storage means is set, and the fractionation management means supplies fuel to the fuel tank. The target amount may be increased every time (Claim 3). In this way, by increasing the amount of gas-phase fuel stored in the gas-phase fuel storage means, a large amount of gas-phase fuel (low level) can be obtained from fuel in the fuel tank (hereinafter sometimes referred to as raw material fuel) at a time. (Boiling point component) is not fractionated. Therefore, excessive heaviness of the raw material fuel can be suppressed.

An exhaust emission control device for a second internal combustion engine according to the present invention includes a fractionation means for fractionating a fuel supplied from a fuel tank of the internal combustion engine into a gas phase and a liquid phase, and a gas fractionated by the fractionation means. Gas-phase fuel storage means for storing the fuel in the phase, exhaust purification means disposed in the exhaust passage of the internal combustion engine and regenerating the function by temperature increase and / or air-fuel ratio control, and gas in the gas-phase fuel storage means A gas phase fuel supply means for supplying phase fuel to the exhaust gas purification means, and a regeneration timing estimation means for estimating a function regeneration time of the exhaust gas purification means; Fuel supply amount setting means for setting the amount of gas phase fuel supplied from the gas phase fuel supply means during function regeneration, storage amount acquisition means for acquiring the storage amount of the gas phase fuel storage means, and fuel supply amount setting means The amount of vapor fuel set by the A fractionation management means for managing the operation of the fractionation means based on the shortage amount of gas phase fuel estimated from the storage amount acquired by the quantity acquisition means and the function regeneration timing estimated by the regeneration timing estimation means; And a target amount of vapor phase fuel to be stored in the vapor phase fuel storage means is set, and the fraction management means increases the target amount every time fuel is supplied to the fuel tank ( Claim 4). In the exhaust gas purification apparatus for a second internal combustion engine of the present invention, the fractionation means fractionates fuel using the exhaust heat of the internal combustion engine, and the fractionation management means has the fuel separated by the fractionation means. When it is determined that the temperature is raised to the target temperature, the fractionating means may be operated (Claim 5).

In the first or second exhaust gas purification apparatus for an internal combustion engine of the present invention, the liquid phase fuel fractionated is returned to the fuel tank, and the fraction management means is a fuel stored in the fuel tank. The fractionation means may be operated so that the proportion of vapor-phase fuel fractionated from is limited to a target fraction fraction or less (claim 6). In this case, since the amount of vapor phase fuel fractionated from the raw material fuel is limited, the vapor phase fuel is not excessively fractionated from the raw material fuel. For this reason, excessive heaviness of the raw material fuel can be suppressed. As the target fraction ratio, for example, a ratio is set such that the degree of heavyness of the fuel stored in the fuel tank is within a range that does not hinder the operation of the internal combustion engine. Also, if the ratio of the amount of gas phase fuel to be recovered by fractional distillation with respect to the amount of raw material fuel consumed in the internal combustion engine is determined, the gas phase fuel will be secured at this ratio relative to the source fuel. A target fraction fraction may be set in

According to a third aspect of the present invention, there is provided an exhaust gas purification apparatus for fractionating a fuel supplied from a fuel tank of an internal combustion engine into a gas phase and a liquid phase, and a gas fractionated by the fractionating means. Gas-phase fuel storage means for storing the fuel in the phase, exhaust purification means disposed in the exhaust passage of the internal combustion engine and regenerating the function by temperature increase and / or air-fuel ratio control, and gas in the gas-phase fuel storage means A gas phase fuel supply means for supplying phase fuel to the exhaust gas purification means, and a regeneration timing estimation means for estimating a function regeneration time of the exhaust gas purification means; Fuel supply amount setting means for setting the amount of gas phase fuel supplied from the gas phase fuel supply means during function regeneration, storage amount acquisition means for acquiring the storage amount of the gas phase fuel storage means, and fuel supply amount setting means The amount of vapor fuel set by the A fractionation management means for managing the operation of the fractionation means based on the shortage amount of gas phase fuel estimated from the storage amount acquired by the quantity acquisition means and the function regeneration timing estimated by the regeneration timing estimation means; And the fractionated liquid fuel is returned to the fuel tank, and the fractionation management means is configured such that the fraction of vapor phase fuel fractionated from the fuel stored in the fuel tank is a target fractionation. The fractionating means is operated so as to be limited to a ratio or less (Claim 7). In the purification apparatus for an internal combustion engine according to the third aspect of the present invention, the fractionation means fractionates fuel using exhaust heat of the internal combustion engine, and the fractionation management means targets the fuel by the fractionation means. When it is determined that the temperature is raised to a temperature, the fractionating means may be operated (Claim 8).

  According to the present invention, since the fractionating means is appropriately operated according to the function regeneration timing of the exhaust purification means and the shortage amount of the gas phase fuel, the fractionating means does not operate wastefully. For this reason, it is possible to prevent wasteful heating of the fuel and suppress deterioration of the fuel. Moreover, since excessive fractionation of vapor phase fuel is prevented, excessive heavy fuel fuel can be suppressed. Furthermore, it is possible to improve the energy efficiency of the internal combustion engine by reducing the operating time of the fractionating means.

  FIG. 1 shows an internal combustion engine to which an exhaust emission control device according to an embodiment of the present invention is applied. The internal combustion engine 1 in FIG. 1 is configured as a diesel engine having a plurality (four in FIG. 1) of cylinders 2. As is well known, an intake passage 3 and an exhaust passage 4 are connected to the internal combustion engine 1, and a compressor 5 a of a turbocharger 5, an intercooler 6 for cooling intake air, and a throttle valve 7 for adjusting the intake amount are connected to the intake passage 3. Is provided. The exhaust passage 4 is provided with an exhaust turbine 5b of the turbocharger 5 and an exhaust purification catalyst 8 as exhaust purification means. As the exhaust purification catalyst 8, a particulate filter carrying an NOx storage reduction catalyst is used. The exhaust passage 4 is connected to the intake passage 3 by an EGR passage 10 via an EGR cooler 9 in order to return a part of the exhaust gas to the intake passage 3.

  The internal combustion engine 1 is provided with a fuel supply device 11. The fuel supply device 11 includes a fuel injection valve 12 that injects fuel into each cylinder 2, a common rail 13 that stores high-pressure fuel injected from the fuel injection valve 12, a fuel tank 14 that stores fuel, and a fuel tank 14. And a fuel pump 15 for supplying fuel to the common rail 13. The fuel tank 14 is provided with an air communication pipe 14 a for adjusting the pressure in the fuel tank 14.

  In addition, the internal combustion engine 1 includes a light gas phase fuel (hereinafter sometimes referred to as a light fuel) that contains many low-boiling components and a heavy liquid-phase fuel that contains many high-boiling components (hereinafter also referred to as light fuel). Hereinafter, the fuel fractionator 16 for fractional distillation may be described, and the fuel addition device 17 for adding the fractionated light fuel to the exhaust passage 4 upstream of the exhaust purification catalyst 8. And are provided. The timing for adding the light fuel to the particulate filter supporting the NOx storage reduction catalyst 8 as the exhaust purification catalyst 8 is to set the air-fuel ratio of the exhaust to stoichiometric or rich so that the NOx stored in the catalyst 8 is released. At the time of NOx reduction, at the time of S regeneration in which the air-fuel ratio of the exhaust gas is set to stoichiometric or rich and the temperature of the exhaust gas is raised more than at the time of NOx reduction to release the sulfur content (S) stored in the catalyst 8, and the catalyst 8 There is a PM regeneration time in which particulate matter (PM) collected by the filter is oxidized and removed by raising the temperature. Note that the amount of light fuel added differs between NOx reduction and S regeneration and PM regeneration (hereinafter, S regeneration and PM regeneration are collectively referred to as function regeneration). During function regeneration, more light fuel is added to the catalyst 8 than during NOx reduction.

  The fuel fractionator 16 includes a fractionation passage 18, a raw material fuel pump 19 for supplying the raw fuel from the fuel tank 14 to the fractionation passage 18, and a flow rate for adjusting the flow rate of the raw fuel supplied to the fractionation passage 18. The adjustment valve 20, the gas phase passage 21 and the liquid phase passage 22 branched from the fractionation passage 18, the light fuel tank 23 for storing the light fuel fractionated in the fractionation passage 18, and the light fuel tank 23 are stored. And a storage amount sensor 24 that outputs a signal corresponding to the amount of light fuel. The fuel fractionator 16 includes a first heat exchanger 25 that exchanges heat between the raw fuel and the light fuel, and a first heat exchanger that exchanges heat between the heavy fuel that has not been vaporized in the fractionation passage 18 and the raw fuel. A second heat exchanger 26 is provided. The fractionation passage 18 is provided with a fractionation temperature sensor 27 that outputs a signal corresponding to the temperature in the fractionation passage 18. The fuel addition device 17 includes a light fuel addition injector 28 for adding light fuel to the exhaust passage 4, and a light fuel pump 29 for sending the light fuel in the light fuel tank 23 to the light fuel addition injector 28.

  The fractionation passage 18 is disposed in the exhaust manifold 4a of the exhaust passage 4, and includes a fractionation section 18a that raises the fuel to a target temperature (for example, 200 to 250 degrees) using exhaust heat, and a fractionation section 18a. A branching portion 18b is provided for guiding the vaporized light fuel to the gas phase passage 21 and the heavy fuel that has not been vaporized to the liquid phase passage 22, respectively. FIG. 2 shows an example of the structure of the branching portion 18b. As shown in FIG. 2A, the gas phase passage 21 is connected so as to extend in the horizontal direction from the fractionation section 18a at the branch portion 18b. On the other hand, the liquid phase passage 22 is connected to the fractionation section 18a so as to extend vertically downward at the branch portion 18b. Thus, the liquid phase passage 22 is connected, and only heavy fuel is guided to the liquid phase passage 22 by gravity. The gas phase passage 21 is connected to the light fuel tank 23, and the liquid phase passage 22 is connected to the fuel tank 14.

  The operating state of the internal combustion engine 1 is controlled by an engine control unit (ECU) 30. The ECU 30 is configured as a computer in which a microprocessor and peripheral devices such as ROM and RAM necessary for its operation are combined. For example, the ECU 30 sets the amount of light fuel added to the catalyst 8 during NOx reduction and function regeneration, and controls the operation of the light fuel addition injector 28 so that the set amount of light fuel is added to the catalyst 8. By executing this control, the ECU 30 functions as a fuel supply amount setting means. In order to appropriately control the operation of each device according to the operating state of the internal combustion engine 1, output signals from the fractional temperature sensor 27, the storage amount sensor 28, and the like are input to the ECU 30.

  Further, the ECU 30 executes the control routine of FIG. 3 and operates the fuel fractionator 16 so that the amount of light fuel added to the catalyst 8 is secured in the light fuel tank 23 by the next function regeneration time of the catalyst 8. Let The control routine of FIG. 3 is repeatedly executed at a predetermined cycle during the operation of the internal combustion engine 1. By executing the control routine of FIG. 3, the ECU 30 functions as fractional distillation management means.

  In the control routine of FIG. 3, the ECU 30 first determines in step S11 whether or not the internal combustion engine 1 is in an operating state. Whether or not the internal combustion engine 1 is in an operating state is determined with reference to, for example, the operation of an engine rotation angle sensor (not shown). When it is determined that the internal combustion engine 1 is not in an operating state, the current control routine is terminated. On the other hand, when it is determined that the internal combustion engine 1 is in an operating state, the process proceeds to step S12, where the ECU 30 calculates a determination integrated value A for determining the next function regeneration timing of the exhaust purification catalyst 8. The determination integrated value A is a period of time until the NOx occlusion capacity of the catalyst 8 is reduced by S (sulfur content) occluded by the catalyst 8 or the catalyst 8 is clogged by PM and affects the engine output and the like. Various parameters that can be estimated can be used. Therefore, for example, the integrated value of the engine fuel consumption, the integrated value of the NOx, S and PM engine discharge values, in the case of PM, the differential pressure of the catalyst 8, the output value of the NOx and S concentration sensor provided upstream of the catalyst 8 When the internal combustion engine 1 is mounted on a vehicle, an integrated value of travel distance or the like can be used as the integrated determination value A. The integrated determination value A is not reset until the function regeneration process of the catalyst 8 is executed. By executing this process, the ECU 30 functions as a regeneration time estimating means.

  In the next step S13, the ECU 30 determines the fraction of the light fuel used when the integrated determination value A is smaller than the regeneration determination threshold value B indicating that the function regeneration process of the catalyst 8 is to be performed and the function regeneration is performed. It is determined whether or not it is larger than a fractional distillation start threshold value α indicating that it is time to start. As the fractionation start threshold value α, for example, if fuel fractionation is started from the time point α, it is necessary for regeneration of the function of the catalyst 8 in the light fuel tank 23 until the judgment integrated value A becomes the regeneration judgment threshold value B. The value is set so that a small amount of light fuel can be secured. When it is determined that A is smaller than B and A is larger than α, the process proceeds to step S14, where the ECU 30 performs fuel fractionation so that the amount of light fuel added at the time of regeneration of the function of the catalyst 8 is secured in the light fuel tank 23. The device 16 is activated. Thereafter, the current control routine is terminated. On the other hand, if it is determined that A is greater than or equal to B or A is less than or equal to α, the process proceeds to step S15, where the ECU 30 determines the amount of light fuel to be supplied when the NOx reduction of the catalyst 8 is ensured in the light fuel tank. The distillation apparatus 16 is operated. Thereafter, the current control routine is terminated.

  FIG. 4 shows details of the processing executed in steps S14 and S15 of FIG. In FIG. 4, the same processes as those in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 4, the ECU 30 first determines in step S13 whether A is smaller than B and A is larger than α. If it is determined that A is greater than or equal to B or A is less than or equal to α, the process proceeds to step S21, where the ECU 30 determines whether the storage amount Vl of the light fuel tank 23 is smaller than the light fuel amount Vn added to the catalyst 8 during NOx reduction. Determine whether. Vl is obtained from the output signal of the storage amount sensor 24. If it is determined that Vl is not less than Vn, the process proceeds to step S22 and the fuel fractionator 16 is stopped. Thereafter, the current control routine is terminated. On the other hand, if it is determined that Vl is less than Vn, the process proceeds to step S23, where the ECU 30 operates the fuel fractionator 16. At this time, the fuel fractionator 16 may be operated when it is determined that the fuel is heated to the target temperature in the fractionation passage 18. By operating the fuel fractionator 16 in this way, light fuel having a desired property can be recovered in the light fuel tank 23, and the properties of the light fuel can be stabilized. Further, the fuel fractionator 16 may be operated so that the proportion of light fuel fractionated from the raw material fuel is equal to or less than the target fraction fraction. In this case, excessive heaviness of the raw material fuel can be suppressed. As the target fraction ratio, for example, a ratio is set such that the degree of heavyness of the fuel stored in the fuel tank is within a range that does not hinder the operation of the internal combustion engine. Thereafter, the current control routine is terminated.

  When it is determined in step S13 that A is smaller than B and A is larger than α, the process proceeds to step S24, where the ECU 30 determines whether or not the storage amount Vl is smaller than the light fuel amount Vg required for regenerating the function of the catalyst 8. Judging. When it is determined that Vl is less than Vg, the process proceeds to step S25, where ECU 30 determines whether or not determination integrated value A is smaller than fractional distillation temperature decrease threshold value β. As the fractionation temperature lowering threshold value β, the catalyst 8 is used while the judgment integrated value A changes from β to B at the pace of the light fuel amount fractionated while the judgment integrated value A changes from α to β. A value is set so that it can be determined that the amount of light fuel required for the function regeneration of the above is not stored in the light fuel tank 23. Such a state occurs, for example, when the internal combustion engine 1 is operated for a long time with a low load. If it is determined that A is smaller than β, the process proceeds to step S23, the fuel fractionator 16 is operated, and the current control routine is terminated.

  On the other hand, when it is determined that A is not smaller than β (A is equal to or larger than β), the process proceeds to step S26, and it is determined whether or not the integrated determination value A is smaller than the emergency fuel securing threshold γ. The emergency fuel securing threshold γ has almost no time until the function regeneration time of the catalyst 8 (that is, until the judgment integrated value A becomes B), and it is necessary to urgently secure the fuel to be added to the catalyst 8. A value that can be determined to be present is set. When it is determined that A is smaller than γ, the process proceeds to step S27, and the ECU 30 decreases the determination temperature for determining whether or not the raw material fuel can be supplied to the fractionation passage 18. In the subsequent step S23, the ECU 30 operates the fuel fractionation device 16. Thereafter, the current control routine is terminated. When the ECU 30 determines that the temperature is equal to or higher than the determination temperature, the ECU 30 operates the fuel fractionator 16 to fractionate the fuel. Therefore, the decrease in the determination temperature increases the operating time of the fuel fractionator 16 and improves the yield of light fuel.

  On the other hand, if it is determined that A is not smaller than γ (A is greater than or equal to γ), the process proceeds to step S28, and the liquid phase fuel is introduced into the gas phase passage 21 at the branching portion 18b. Increase the flow rate of the supplied fuel. In the subsequent step S23, the ECU 30 operates the fuel fractionation device 16. Thereafter, the current control routine is terminated. FIG. 2B shows an example of the state of the branching portion 18b when the amount of fuel supplied to the fractionation passage 18 is increased. As apparent from FIG. 2B, when the amount of the liquid phase fuel flowing into the branch portion 18b increases, a part of the liquid phase fuel is introduced into the gas phase passage 21 through the liquid phase passage 22. Therefore, it is possible to secure a necessary amount of fuel in the light fuel tank 23 when the function of the catalyst 8 is regenerated.

  If it is determined in step S24 that Vl is not less than Vg (Vl is Vg or more), the process proceeds to step S29, where the ECU 30 stops the fuel fractionator 16. Thereafter, the current control routine is terminated.

  Thus, by operating the fuel fractionator 16 according to the time until the function regeneration time and the amount of fuel stored in the light fuel tank 23, the wasteful operation time of the fuel fractionator 16 is eliminated. Can do.

  When the function regeneration of the exhaust purification catalyst 8 is long, for example, when the function regeneration of the catalyst 8 is performed every time the fuel amount several times the upper limit value of the storage amount of the fuel tank 14 is consumed, the light fuel tank 23 A target amount of light fuel to be stored may be set, and this target amount may be increased every time fuel is supplied to the fuel tank 14. For example, when the function regeneration of the catalyst 8 is performed every time the internal combustion engine 1 consumes three times the fuel amount of the upper limit value stored in the fuel tank 14, when the fuel tank 14 is refilled with fuel for the first time, First, the target amount is set to 1/3 of the amount of light fuel added to the catalyst 8 during function regeneration. When the fuel is replenished to the fuel tank 14 for the second time, an amount that is 2/3 of the light fuel amount to be added is set as the target amount. Finally, when the fuel is supplied to the fuel tank 14 for the third time, the amount of light fuel added to the catalyst 8 is set as the target amount. As described above, when the amount of light fuel to be secured in the light fuel tank 23 is gradually increased, a large amount of light fuel is not fractionated from the fuel tank 14 at one time. For this reason, rapid increase in the weight of the raw material fuel can be prevented. The parameter used for changing the target amount is not limited to the fuel consumption amount. For example, the target amount may be changed according to the travel distance.

  The present invention is not limited to the above embodiment, and may be implemented in various forms within the scope of the technical idea of the present invention. For example, the internal combustion engine is not limited to a diesel engine, and the present invention can also be applied to a gasoline engine. The exhaust purification means disposed in the exhaust passage is not limited to the particulate filter carrying the NOx storage reduction catalyst. For example, a particulate filter or an NOx storage reduction catalyst may be disposed. When the particulate filter is arranged in the exhaust passage, PM regeneration is executed at a predetermined cycle, and therefore the operation schedule of the fuel fractionation device is managed so that light fuel is secured by this PM regeneration. When the NOx storage reduction catalyst is arranged, NOx reduction and S regeneration are executed, so that the operation schedule is ensured so that the amount of light fuel necessary for each process is ensured by the time when these processes are executed. Is managed.

1 is a view showing an internal combustion engine to which an exhaust emission control device according to an embodiment of the present invention is applied. The figure which expands and shows a part of fractionation channel | path of FIG. The flowchart which shows the fuel fractionation control routine which ECU of FIG. 1 performs. The flowchart which shows the detail of the processing content of step S13-S15 of FIG.

Explanation of symbols

1 Internal combustion engine 4 Exhaust passage 8 Exhaust purification catalyst (exhaust purification means)
14 Fuel tank 16 Fuel fractionator (Fractionator)
17 Fuel addition device (gas phase fuel supply means)
23 Light fuel tank (Gas phase fuel storage means)
24 storage amount sensor (storage amount acquisition means)
30 Engine control unit (regeneration time estimation means, fuel supply amount setting means, fractionation management means)

Claims (8)

A fractionating means for fractionating a fuel supplied from a fuel tank of an internal combustion engine into a gas phase and a liquid phase; a gas phase fuel storing means for storing the fuel in the gas phase fractionated by the fractionating means; An exhaust gas purification unit that is disposed in an exhaust passage of the internal combustion engine and whose function is regenerated by temperature increase and / or air-fuel ratio control, and a gas phase fuel supply that supplies the gas phase fuel of the gas phase fuel storage unit to the exhaust gas purification unit An exhaust gas purification device for an internal combustion engine comprising:
A regeneration timing estimating means for estimating a function regeneration timing of the exhaust purification means; a fuel supply amount setting means for setting a gas phase fuel amount supplied from the gas phase fuel supply means at the time of function regeneration of the exhaust purification means; Shortage of gas phase fuel estimated from the storage amount acquisition means for acquiring the storage amount of the phase fuel storage means, the gas phase fuel amount set by the fuel supply amount setting means and the storage amount acquired by the storage amount acquisition means A fractionation management means for managing the operation of the fractionation means based on the amount and the function regeneration time estimated by the regeneration time estimation means,
The exhaust gas purification apparatus for an internal combustion engine, wherein the fractionation management means operates the fractionation means when it is determined that the time until the next function regeneration time is shorter than a predetermined determination time . The fractionating means fractionates fuel using the exhaust heat of the internal combustion engine,
2. The exhaust gas purification apparatus for an internal combustion engine according to claim 1, wherein the fractionation management unit operates the fractionation unit when it is determined that the fuel is heated to a target temperature by the fractionation unit. . A target amount of vapor phase fuel to be stored in the vapor phase fuel storage means is set,
3. The exhaust gas purification apparatus for an internal combustion engine according to claim 1, wherein the fraction management unit increases the target amount each time fuel is supplied to the fuel tank. A fractionating means for fractionating a fuel supplied from a fuel tank of an internal combustion engine into a gas phase and a liquid phase; a gas phase fuel storing means for storing the fuel in the gas phase fractionated by the fractionating means; An exhaust gas purification unit that is disposed in an exhaust passage of the internal combustion engine and whose function is regenerated by temperature increase and / or air-fuel ratio control, and a gas phase fuel supply that supplies the gas phase fuel of the gas phase fuel storage unit to the exhaust gas purification unit An exhaust gas purification device for an internal combustion engine comprising:
  A regeneration timing estimating means for estimating a function regeneration timing of the exhaust purification means; a fuel supply amount setting means for setting a gas phase fuel amount supplied from the gas phase fuel supply means at the time of function regeneration of the exhaust purification means; Shortage of gas phase fuel estimated from the storage amount acquisition means for acquiring the storage amount of the phase fuel storage means, the gas phase fuel amount set by the fuel supply amount setting means and the storage amount acquired by the storage amount acquisition means A fractionation management means for managing the operation of the fractionation means based on the amount and the function regeneration time estimated by the regeneration time estimation means,
  A target amount of vapor phase fuel to be stored in the vapor phase fuel storage means is set,
  The exhaust gas purification apparatus for an internal combustion engine, wherein the fraction management means increases the target amount each time fuel is supplied to the fuel tank.   The fractionating means fractionates fuel using the exhaust heat of the internal combustion engine,
  5. The exhaust gas purification apparatus for an internal combustion engine according to claim 4, wherein the fractionation management unit operates the fractionation unit when it is determined that the fuel is heated to a target temperature by the fractionation unit. . The fuel tank is returned to the fractionated liquid phase fuel,
The fraction management means operates the fractionation means so that a ratio of vapor phase fuel fractionated from the fuel stored in the fuel tank is limited to a target fraction fraction or less. The fuel purification apparatus for an internal combustion engine according to any one of claims 1 to 5 . A fractionating means for fractionating a fuel supplied from a fuel tank of an internal combustion engine into a gas phase and a liquid phase; a gas phase fuel storing means for storing the fuel in the gas phase fractionated by the fractionating means; An exhaust gas purification unit that is disposed in an exhaust passage of the internal combustion engine and whose function is regenerated by temperature increase and / or air-fuel ratio control, and a gas phase fuel supply that supplies the gas phase fuel of the gas phase fuel storage unit to the exhaust gas purification unit An exhaust gas purification device for an internal combustion engine comprising:
  A regeneration timing estimating means for estimating a function regeneration timing of the exhaust purification means; a fuel supply amount setting means for setting a gas phase fuel amount supplied from the gas phase fuel supply means at the time of function regeneration of the exhaust purification means; Shortage of gas phase fuel estimated from the storage amount acquisition means for acquiring the storage amount of the phase fuel storage means, the gas phase fuel amount set by the fuel supply amount setting means and the storage amount acquired by the storage amount acquisition means A fractionation management means for managing the operation of the fractionation means based on the amount and the function regeneration time estimated by the regeneration time estimation means,
  The fuel tank is returned to the fractionated liquid phase fuel,
  The fraction management means operates the fractionation means so that a ratio of vapor phase fuel fractionated from the fuel stored in the fuel tank is limited to a target fraction fraction or less. A fuel purification device for an internal combustion engine.   The fractionating means fractionates fuel using the exhaust heat of the internal combustion engine,
  8. The exhaust gas purification apparatus for an internal combustion engine according to claim 7, wherein the fractionation management means operates the fractionation means when it is determined that the fuel is heated to a target temperature by the fractionation means. .

Images