JP2008019848A - Internal combustion engine system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an internal combustion engine system which precisely controls ignition timing in premixed compression ignition. <P>SOLUTION: The internal combustion engine system is provided with: a fuel tank 4a storing ethanol; a fuel tank 4b storing at least one of gasoline and GTL naphtha; a reforming means 9 for reforming ethanol in order to obtain diethyl ether; a heat exchange means 14 for heating a heating medium; an ethanol heating means 9b for heating ethanol by the heating medium; and a fuel supply control means 10 for controlling a mixing ratio of fuel. An intake heating means 18 for heating the intake by the heating medium is provided. A heat-insulated storage vessel 29 for storing the heating medium during stopping of the internal combustion engine 3 is provided. Also provided is a flow control means 27 for making the heating medium flow to the heat-insulated storage vessel 29 only when a temperature of a temperature detecting means 30a is higher than a temperature of a temperature detecting means 30b in operation of the internal combustion engine 3. A fuel tank 42 for storing the mixed fuel and a separating means 43 for adding water into the mixed fuel and separating it into ethanol-water mixed liquid, gasoline and GTL naphtha are provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an internal combustion engine system capable of switching between a spark ignition operation and a premixed compression ignition operation.

  In recent years, a compression ignition internal combustion engine represented by a premixed compression ignition internal combustion engine has been studied in order to improve the fuel consumption of the internal combustion engine and reduce emissions. A premixed compression ignition internal combustion engine introduces an oxygen-containing gas and a fuel capable of compression auto-ignition into a cylinder and compresses them to cause self-ignition.

  However, unlike the spark ignition type internal combustion engine, the premixed compression ignition internal combustion engine has a problem that it is difficult to control the timing of ignition and the operating range in which it can be stably operated is narrow. More specifically, the problem is that when a highly ignitable fuel is used, knocking is likely to occur when the required load of the engine is high, and when a low ignitable fuel is used, the required load of the engine is low. It is easy to misfire. In order to solve the above problem, there is known an internal combustion engine system that can switch between a spark ignition operation and a premixed compression ignition operation according to an operation condition or the like (see, for example, Patent Documents 1 and 2).

  Further, in order to solve the above problem, by preparing a plurality of fuels having different ignition characteristics and controlling the mixing ratio when supplying the plurality of fuels to the premixed compression ignition internal combustion engine, the ignition timing is set. It is possible to control. Examples of the plurality of fuels having different ignition characteristics include a combination of liquid hydrocarbons such as gasoline and GTL naphtha and ethanol.

  In addition, according to ethanol, what is called a carbon neutral effect can be acquired and it can contribute to reduction of a carbon dioxide emission amount. The carbon neutral effect means that in plant-derived ethanol, the plant as a raw material absorbs carbon dioxide by performing photosynthesis in its growth process, so even if the ethanol is burned to generate carbon dioxide, Overall, no new carbon dioxide was emitted.

  The liquid hydrocarbon and ethanol may be stored in separate tanks, or may be stored in one tank as a mixed fuel, and separated into liquid hydrocarbon and ethanol as necessary. . It is known that the mixed fuel of the liquid hydrocarbon and ethanol is easily separated into the liquid hydrocarbon and the ethanol-water mixed solution when water is added (see, for example, Patent Document 3).

  Of the liquid hydrocarbons and ethanol, ethanol is less self-igniting. Therefore, by adjusting the mixing ratio of the two, for example, the ignition characteristic represented by the octane number can be changed, and the ignition timing of the premixed compression ignition can be controlled.

However, it is desired to develop an internal combustion engine system that can more effectively control the ignition timing of premixed compression ignition.
JP 2001-152919 A Japanese Patent Laid-Open No. 2002-130006 JP 58-96155 A JP 2001-207845 A

  The present invention eliminates such inconvenience and can switch between a spark ignition operation and a premixed compression ignition operation, and precisely controls the ignition timing of the premixed compression ignition when performing the premixed compression ignition operation. It is an object of the present invention to provide an internal combustion engine system that can be used.

  In order to achieve this object, an internal combustion engine system according to a first aspect of the present invention is a first fuel tank that contains ethanol in an internal combustion engine system that can switch between a spark ignition operation and a premixed compression ignition operation. A second fuel tank containing at least one of gasoline and GTL naphtha, and reforming by heating a portion of ethanol supplied from the first fuel tank to the internal combustion engine and contacting the catalyst, The reforming means for obtaining diethyl ether, the heat exchange means for exchanging heat between the exhaust heat of the internal combustion engine and the heat medium, and heating the heat medium, and the heat medium heated by the heat exchange means Ethanol heating means for heating the ethanol supplied to the gas quality means, ethanol supplied from the first fuel tank to the internal combustion engine, and gas supply supplied from the second fuel tank to the internal combustion engine And at least one of GTL naphtha, characterized in that it comprises a fuel supply control means for controlling the mixing ratio of diethyl ether to be supplied to the internal combustion engine from the reforming unit.

  According to the internal combustion engine system of the first aspect, a part of ethanol stored in the first fuel tank can be reformed to diethyl ether by the reforming means. Here, the ethanol has a lower self-ignition property than the gasoline or GTL naphtha, whereas diethyl ether has a higher self-ignition property than the gasoline or GTL naphtha.

  Therefore, by controlling the mixing ratio of the ethanol supplied to the internal combustion engine, at least one of gasoline and GTL naphtha, and diethyl ether by the fuel supply control means, the ignition timing is determined in the premixed compression ignition. Can be precisely controlled.

  By the way, when reforming the ethanol to the diethyl ether using a catalyst, it is necessary to keep the ethanol contacting the catalyst at a constant temperature of about 200 ° C. Here, it is conceivable to use the exhaust heat of the internal combustion engine as a heat source for heating the ethanol to the temperature. However, if the exhaust heat of the internal combustion engine is used directly, the temperature of the reforming means becomes non-uniform due to large heat dissipation and the latent heat of ethanol is large, so that the required reforming performance is maintained. Difficult to do.

  Therefore, in the internal combustion engine system according to the first aspect, the heat exchanging means heats the heat medium by exchanging heat between the exhaust heat of the internal combustion engine and the heat medium, and using the heat medium, the heat medium The ethanol is heated by an ethanol heating means. As a result, the temperature of the ethanol can be easily maintained at a constant temperature of about 200 ° C., and the required reforming performance can be easily achieved by bringing the ethanol into contact with the catalyst by the reforming means. Can be maintained.

  Next, an internal combustion engine system according to a second aspect of the present invention is an internal combustion engine system capable of switching between a spark ignition operation and a premixed compression ignition operation, a first fuel tank that contains ethanol, gasoline, and GTL. A second fuel tank containing at least one of the naphtha and a part of ethanol supplied from the first fuel tank to the internal combustion engine is heated and brought into contact with the catalyst for reforming to obtain diethyl ether. Heat exchange means for heating the heat medium by exchanging heat between the exhaust heat of the internal combustion engine and the heat medium, and heating the intake air of the internal combustion engine by the heat medium heated by the heat exchange means Intake air heating means, ethanol supplied from a first fuel tank to the internal combustion engine, gasoline and GTL naphtha supplied from a second fuel tank to the internal combustion engine, and the reforming Characterized in that the stage and a fuel supply control means for controlling the mixing ratio of diethyl ether to be supplied to the internal combustion engine.

  According to the internal combustion engine system of the second aspect, in the same manner as in the first aspect, a mixing ratio of the ethanol supplied to the internal combustion engine, at least one of gasoline and GTL naphtha, and diethyl ether is set. By controlling the fuel supply control means, the ignition timing can be precisely controlled during the premixed compression ignition.

  At this time, the ignition timing can also be controlled by heating the intake air of the internal combustion engine. Therefore, in the internal combustion engine system of the second aspect, the heat exchange means heats the exhaust medium of the internal combustion engine and the heat medium to heat the heat medium, and the heat medium is used to heat the heat medium. The intake air of the internal combustion engine is heated by the intake air heating means.

  By doing so, the control of the ignition timing by the operation of the fuel supply control means can be supplemented by the heating of the intake air in the intake air heating means, and the ignition timing is controlled precisely and effectively. Can do.

  The internal combustion engine system according to the second aspect may further include ethanol heating means for heating ethanol supplied to the reforming means by the heat medium heated by the heat exchange means. In this way, the ignition timing control by the action of the fuel supply control means can be supplemented by the heating of the intake air in the intake air heating means, and the required reforming performance can be achieved in the reforming means. Can be easily maintained.

  In the internal combustion engine system of the second aspect, providing the ethanol heating means is synonymous with providing the intake air heating means in the internal combustion engine system of the first aspect.

  In both the first and second aspects, instead of the first fuel tank for storing ethanol and the second fuel tank for storing at least one of gasoline and GTL naphtha, ethanol, gasoline and A fuel tank containing a mixed fuel comprising at least one of GTL naphtha, adding water to the mixed fuel supplied from the fuel tank, and adding at least one of the gasoline and GTL naphtha, an ethanol-water mixture, Separation means for separation may be provided.

  In this case, a part of the ethanol-water mixture obtained by the separation means is converted into a diethyl ether-water mixture by the reforming means in the same manner as in the first and second aspects. Quality. The fuel supply control means controls the mixing ratio of the ethanol-water mixture supplied to the internal combustion engine, at least one of gasoline and GTL naphtha, and the diethyl ether-water mixture. In the case where the ethanol heating means is provided, the heat exchange means heats the heat medium by exchanging heat between the exhaust heat of the internal combustion engine and the heat medium, and uses the heat medium to heat the ethanol. The ethanol-water mixture is heated by a heating means.

  Further, in the internal combustion engine system of each aspect, the spark ignition operation is performed at a high load, and the premixed compression ignition operation is performed at a low load.

  Further, in the internal combustion engine system of each aspect, when the internal combustion engine stops operating, the heat medium is cooled, and at the time of starting, it is heated again from the cooled state. Therefore, it takes time until the ethanol or the ethanol-water mixture or the intake air of the internal combustion engine can be heated.

  Therefore, the internal combustion engine system of each aspect preferably includes a heat insulating storage container that stores the heat medium heated by the heat exchange means and stores it in a heat insulating state while the internal combustion engine is stopped. . In the internal combustion engine system of each aspect, the heat medium is accommodated in the heat insulating storage container when the internal combustion engine is stopped, and stored while the internal combustion engine is stopped, thereby avoiding cooling of the heat medium. it can. Accordingly, at the time of start-up, heating of the ethanol or ethanol-water mixture or heating of the intake air of the internal combustion engine can be started immediately.

  As the heat insulation storage container, for example, a heat storage container that stores cooling water heated by a water-cooled internal combustion engine for early warm-up can be used (see Patent Document 4).

  Moreover, when the internal combustion engine system of each said aspect is equipped with the said heat insulation storage container, the temperature of the said heat medium heated by the 1st temperature detection means which detects the temperature of the said heat insulation storage container, and the said heat exchange means is used. Second temperature detecting means for detecting, and during operation of the internal combustion engine, only when the temperature detected by the first temperature detecting means is higher than the temperature detected by the second temperature detecting means, It is preferable to provide a flow control means for flowing the heat medium through the heat insulating storage container.

  According to the flow control means, only when the temperature detected by the first temperature detection means is higher than the temperature detected by the second temperature detection means during operation of the internal combustion engine, Distributes to insulated storage containers. As a result, the heat medium is heated not only by the heat exchanging means but also by the heat insulating storage container, and the range of temperature control during operation of the internal combustion engine can be expanded.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. 1 is a system configuration diagram showing a configuration example of an internal combustion engine system of the present invention, FIG. 2 is a system configuration diagram showing a configuration of an engine room in the internal combustion engine system shown in FIG. 1, and FIGS. 3 and 4 are systems of FIG. FIG. 5 is a system configuration diagram showing another configuration example of the internal combustion engine system of the present invention.

  As shown in FIG. 1, an internal combustion engine system 1 of the present embodiment includes an internal combustion engine 3 disposed in an engine room 2, a first fuel tank 4 a that supplies fuel to the internal combustion engine 3, and a second fuel tank. 4b. The internal combustion engine 3 is a hybrid combustion engine capable of switching between a spark ignition operation and a premixed compression ignition operation, and is capable of operating ethanol as a fuel and at least one of gasoline and GTL naphtha at an arbitrary mixing ratio. It is a flexible fuel vehicle. The first fuel tank 4 a contains ethanol as fuel to be supplied to the internal combustion engine 3, and the second fuel tank 4 b contains gasoline or GTL naphtha as fuel to be supplied to the internal combustion engine 3. The second fuel tank 4b may contain a mixed fuel of gasoline and GTL naphtha.

  The first fuel tank 4a is connected to the first injector 6a of the internal combustion engine 3 through the first conduit 5a. A pump 7a is disposed in the middle of the first conduit 5a, and ethanol contained in the first fuel tank 4a is supplied to the first injector 6a by the pump 7a.

  At this time, the distribution device 8 is disposed on the downstream side of the pump 7a, and the second conduit 5b branches from the distribution device 8. A reformer 9 is disposed in the middle of the second conduit 5b. Ethanol supplied from the distributor 8 to the reformer 9 via the second conduit 5b is brought into contact with the catalyst under heating to generate diethyl. Modified to ether. The second conduit 5b is connected to the second injector 6b of the internal combustion engine 3, and diethyl ether obtained by the reformer 9 is supplied to the second injector 6b through the second conduit 5b.

  On the other hand, the second fuel tank 4b is connected to the third injector 6c of the internal combustion engine 3 through the third conduit 5c. A pump 7b is disposed in the middle of the third conduit 5c, and liquid hydrocarbons such as gasoline, GTL naphtha, or a mixed fuel of gasoline and GTL naphtha contained in the second fuel tank 4b are pumped. Is supplied to the third injector 6c.

  In the internal combustion engine system 1, the first to third injectors 6 a, 6 b, 6 c are electrically connected to the fuel supply control means 10, and the fuel supply control means 10 is ethanol supplied to the internal combustion engine 3. And the mixing ratio of diethyl ether and the liquid hydrocarbon is adjusted.

  Next, as shown in FIG. 2, the engine room 2 is provided with the internal combustion engine 3, an exhaust device 11 that exhausts exhaust gas from the internal combustion engine 3, and intake air that supplies intake air to the internal combustion engine 3. Device 12.

  The exhaust device 11 has a first heat that heats the heat medium by exchanging heat between the exhaust pipe 13 connected to the internal combustion engine 3 and the exhaust gas that flows through the exhaust pipe 13 in the middle of the exhaust pipe 13 and the heat medium. And an exchanger 14.

  On the other hand, the intake device 12 is connected to the internal combustion engine 3, a direct line 15 that supplies intake air to the internal combustion engine 3, branches from the direct line 15 on the upstream side of the direct line 15, and merges with the direct line 15 again on the downstream side. A heating line 16 is provided. A first flow rate control valve 17a is provided downstream of the branch portion of the direct line 15 with the heating line 16, and a second flow rate control valve 17b is provided upstream of the junction with the direct line 15 of the heating line 16. The opening degree of the flow control valves 17a and 17b is adjusted by an electromagnetic control throttle device (not shown). In the middle of the heating line 16, a second heat exchanger 18 is disposed as an intake air heating means for exchanging heat between the heat medium heated by the first heat exchanger 14 and the intake air to heat the intake air. Has been.

  The heat medium is circulated by a heat medium circulation system 19 disposed in the engine room 2. In the heat medium circulation system 19, a low-pressure pump 20, a flow control valve 21, a first heat exchanger 14, a reformer 9, and a second heat exchanger 18 are arranged in order from the upstream side. The heat medium exchanges heat with the intake air in the heat exchanger 18 and then in the third heat exchanger 22 disposed downstream thereof, the engine coolant supplied by the engine coolant circulation system 23 After being cooled by heat exchange, it is circulated to the low-pressure pump 20. The heat medium circulation system 19 is provided with a bypass 19 a that branches from the flow rate control valve 21 and joins the heat medium circulation system 19 between the first heat exchanger 14 and the reformer 9. Further, the reformer 9 is an ethanol heater that heats the ethanol by exchanging heat between the heat medium heated by the first heat exchanger 14 and ethanol supplied to the reformer 9 from the second conduit 5b. It also serves as a means.

  On the other hand, the engine coolant circulation system 23 includes a first coolant conduit 23a, a second coolant conduit 23b, a third coolant conduit 23c, and a fourth coolant conduit 23d. The first cooling water conduit 23 a connects the internal combustion engine 3 and the ethanol pre-heater 24 disposed in the second conduit 5 b on the upstream side of the reformer 9 to cool the engine heated by the internal combustion engine 3. Water is supplied to the ethanol preheater 24. The second cooling water conduit 23 b connects the ethanol preheater 24 and the internal combustion engine 3 and supplies engine cooling water cooled by the ethanol preheater 24 to the internal combustion engine 3. The third cooling water conduit 23 c connects the internal combustion engine 3 and the second heat exchanger 18 via the third heat exchanger 22, and exchanges heat with the heat medium by the third heat exchanger 22. Further, the heated engine cooling water is supplied to the second heat exchanger 18. The fourth cooling water conduit 23 d connects the second heat exchanger 18 and the internal combustion engine 3, and supplies engine cooling water cooled by exchanging heat with the intake air in the second heat exchanger 18 to the internal combustion engine 3. . The fourth cooling water conduit 23d is connected to the first cooling water conduit 23a.

  Next, with reference to FIG. 3, an aspect of the action of the heat medium in the internal combustion engine system 1 of the present embodiment will be described.

  As the heat medium, a heat medium having a boiling point of 200 ° C. or higher, such as mineral oil or silicone oil, can be used. The heat medium generally used in a plant or the like can be used as it is known per se, and it is not necessary to use a special one.

  In the heat medium circulation system 19, the heat medium is circulated by the low-pressure pump 20, and a necessary amount is first supplied to the first heat exchanger 14 through the flow rate control valve 21, while excess heat medium is first supplied by the bypass 19. The heat exchanger 14 is bypassed. The first heat exchanger 14 exchanges heat between the exhaust and the supplied heat medium to heat the heat medium, and supplies the heated heat medium to the reformer 9.

  At this time, a temperature sensor 25 is disposed upstream of the reformer 9. The flow rate control valve 21 is feedback controlled so that the temperature of the heat medium detected by the temperature sensor 25 becomes an appropriate temperature (generally 200 ° C.) for reforming ethanol into diethyl ether by the reformer 9. 1 The amount of the heat medium supplied to the heat exchanger 14 is controlled.

  The reformer 9 also serves as ethanol heating means for heating ethanol supplied via the second conduit 5b, and is configured such that the ethanol and the heating medium form a counter flow. The heat medium supplied to the reformer 9 first heats the reformer body 9a, and then heats ethanol in the fourth heat exchanger 9b.

  The reformer 9 has a heat capacity substantially proportional to the weight. When ethanol is directly heated by exhaust gas, the heat capacity becomes a factor of temperature disturbance at the start of reforming. However, in this embodiment, the reformer 9 is first heated to the vicinity of the reforming temperature by the heat medium, and then ethanol is supplied to the reformer 9 so that the reforming can be stably performed from the start of reforming. It can be performed. At this time, by configuring the catalyst so as to be surrounded by the heating medium, it is possible to stabilize the temperature of the catalyst, prevent the temperature from becoming non-uniform spatially, and obtain excellent reforming performance. .

  In this embodiment, the second conduit 5b on the upstream side of the reformer 9 is provided with the ethanol pre-heater 24 so that ethanol supplied to the reformer 9 is preheated. It is possible to prevent the necessary heat capacity of the medium from becoming excessive. The ethanol preheater 24 heats ethanol supplied to the reformer 9 to a temperature of about 80 ° C. in advance by supplying engine cooling water heated by the internal combustion engine 3 through the first cooling water conduit 23a. be able to.

  The heat medium discharged from the reformer 9 is then supplied to the second heat exchanger 18 to exchange heat with the intake air to heat the intake air. Since the heat medium has a considerable amount of heat even after the intake air is heated, it is then supplied to the third heat exchanger 22 and supplied to the third heat exchanger 22 from the third cooling water conduit 23c. It is cooled to a temperature of about 80 ° C. by exchanging heat with engine cooling water. Then, the heat medium cooled as described above is circulated to the low-pressure pump 20.

  By the way, the intake air supplied to the second heat exchanger 18 exchanges heat with engine cooling water supplied in advance from the third cooling water conduit 23c before being heated by heat exchange with the heat medium. It may be heated by doing. At this time, since the engine coolant supplied from the third coolant conduit 23c is heated by the internal combustion engine 3, it is supplied to the third heat exchanger 22 as shown in FIG.

  The engine coolant supplied from the third coolant conduit 23c is supplied to the third heat exchanger 22, heated by exchanging heat with the heat medium, and discharged to the fourth coolant conduit 23d. Therefore, in this case, by providing the heater core 26 in the middle of the fourth cooling water conduit 23d, it becomes possible to heat the heater core 26 with the engine cooling water and use the heating early. Alternatively, the engine can be warmed up by the engine coolant heated by the third heat exchanger 22.

  Since the heat medium circulation system 19 includes only a control system and a heat exchange system, there is little pressure loss and no high pressure is required. Therefore, the low pressure pump 20 can be used for circulation of the heat medium.

  The flow rate of the heat medium is required to maintain the temperature control stability for reforming ethanol to diethyl ether in the reformer 9. However, since the amount of ethanol itself is small, the flow rate of the heating medium does not require so much, for example, several liters / minute is sufficient. Therefore, the low-pressure pump 20 may be small, and the power consumption is at most several tens of watts.

  As described above, the heat medium passing through the low-pressure pump 20 has a temperature of about 80 ° C. in the third heat exchanger 22. Therefore, the low-pressure pump 20 does not require special heat-resistant means, although heat-resistant considerations are necessary.

  In addition, the heat medium has a larger flow rate than ethanol, has a large heat capacity and is less affected by heat dissipation, and does not boil during heating. In comparison, high control stability can be obtained.

  In this embodiment, the flow rate control valve 21 is used to distribute the heat medium to the first heat exchanger 14 and the bypass 19a. However, instead of the flow rate control valve 21, a thermo valve such as a bimetal is used. May be used. According to the thermo valve, since a power supply and a control circuit are unnecessary, the apparatus configuration can be simplified.

  According to the internal combustion engine system 1 of the present embodiment, required reforming performance is achieved by the reformer 9 by heating ethanol using the heat medium heated by exchanging heat with the exhaust as described above. It can be secured easily. As a result, by adjusting the mixing ratio of ethanol, diethyl ether, and the liquid hydrocarbon, the ignition characteristics of the fuel can be continuously changed, and the ignition timing during the premixed compression ignition operation can be controlled. Can be done precisely.

  Further, according to the internal combustion engine system 1 of the present embodiment, the intake air is heated using the heat medium heated by exchanging heat with the exhaust as described above, so that the ignition timing in the premixed compression ignition operation is reached. Control can be performed precisely and effectively.

  The internal combustion engine system 1 of the present embodiment includes ethanol heating means (reformer 9 (fourth heat exchanger 9b)) that uses a heat medium heated by exchanging heat with exhaust as described above, and intake air heating means. (Second heat exchanger 18). However, only the ethanol heating means may be provided, or only the intake air heating means may be provided. However, when only the intake air heating means is provided, a means for heating ethanol supplied to the reformer 9 with a heat source other than the heat medium is necessary.

  Next, with reference to FIG. 4, another aspect of the action of the heat medium in the internal combustion engine system 1 of the present embodiment will be described.

  The configuration shown in FIG. 4 includes a heat insulating storage container 29 provided with a control valve 27 on the upstream side of the reformer 9 in the heat medium circulation system 19 and connected to a conduit 28a branched from the control valve 27. 29 is connected to the heat medium circulation system 19 on the downstream side of the control valve 27 by a conduit 28b. The heat medium circulation system 19 upstream of the control valve 27 is provided with a temperature sensor 30a for detecting the temperature of the heat medium, and the heat insulation storage container 29 is a temperature sensor for detecting the temperature of the heat insulation storage container 29. 30b is provided. The temperature sensors 30 a and 30 b are both electrically connected to the control valve 37 and output the detected temperature to the control valve 37.

  In the heat medium circulation system 19, an absorption air conditioner regenerator 31 is interposed downstream of the reformer 9. The absorption-type air conditioner regenerator 31 is connected with a water-lithium bromide conduit 32a for supplying lithium bromide that has absorbed water from an absorption-type air conditioner (not shown). A drainage conduit 32b for distilling the absorbed lithium bromide and discharging the obtained water is connected to a lithium bromide conduit 32c for resupplying the lithium bromide regenerated by the distillation to the absorption air conditioner. .

  Except for the above-described configuration, the configuration shown in FIG. 4 is the same as the configuration shown in FIG. In FIG. 4, the ethanol pre-heater 24, the temperature sensor 25, and the heater core 26 are omitted.

  In the configuration shown in FIG. 4, the same heat medium as that shown in FIG. 3 is circulated to the heat circulation system 19 by the low-pressure pump 20 and heated by the first heat exchanger 14 in the same manner as shown in FIG. 3. The heating medium heated by the first heat exchanger 14 is heated in the same manner as shown in FIG. 3, the ethanol is heated by the reformer 9, and then the intake air of the internal combustion engine 3 is heated by the second heat exchanger 18. After that, the third heat exchanger 22 is cooled to a temperature of about 80 ° C. by exchanging heat with the engine coolant. Then, the heat medium cooled as described above is circulated to the low-pressure pump 20.

  By the way, when the internal combustion engine 3 is stopped, the heat medium is cooled without being heated by the first heat exchanger 14. Once the heating medium has been cooled, it takes time until it is heated again. Therefore, at the time of starting, it takes time until the heating of the ethanol or the intake air becomes possible.

  Therefore, in the configuration shown in FIG. 4, when the internal combustion engine 3 is stopped, the control valve 27 detects the stop of the internal combustion engine 3 and introduces the heat medium into the heat insulating storage container 29 via the conduit 28a. The heat medium is stored at a temperature that is heated by the first heat exchanger 14. On the other hand, if the heat insulation storage container 29 detects the operation of the internal combustion engine 3, the heat medium stored through the conduit 28 b is supplied to the heat circulation system 19 and circulated. As a result, a high-temperature heat medium can be circulated in the heat circulation system from the start, and the ethanol or the intake air can be heated in a very short time.

  At this time, the control valve 27 normally closes the conduit 28 a, and the heat medium is not introduced into the heat insulating storage container 29. The conduit 28b is provided with a check valve (not shown) so that the heat medium circulating in the heat circulation system 19 does not flow into the heat insulating storage container 29 from the conduit 28b.

  By the way, when the heat medium circulates in the heat circulation system 19 during the operation of the internal combustion engine 3, the temperature T1 of the heat medium becomes lower than the temperature T2 in the heat insulating storage container 29 depending on conditions. There is. Therefore, in the configuration shown in FIG. 4, the temperature sensor 30 a provided on the upstream side of the control valve 27 in the thermal circulation system 19 detects the temperature T1 of the heating medium and the temperature sensor provided in the heat insulating storage container 29. The temperature T2 of the heat insulation storage container 29 is detected by 30b. The control valve 27 compares the temperatures detected by the temperature sensors 30a and 30b, and only when the temperature T2 of the heat insulating storage container 29 is higher than the temperature T1 of the heat medium (T2> T1). Is circulated in the heat insulating storage container 29.

  At this time, the heat medium is introduced into the heat insulating storage container 29 from the control valve 27 via the conduit 28a, and then passes through the heat insulating storage container 29 and is returned to the heat circulation system 19 from the conduit 28b. The Therefore, the heat medium is heated not only by the first heat exchanger 14 but also by the heat insulating storage container 29, and the range of temperature control during operation of the internal combustion engine 3 can be expanded.

  In the configuration of FIG. 4, an absorption air conditioner regenerator 31 may be interposed in the middle of the heat circulation system 19, for example, between the reformer 9 and the second heat exchanger 18. The absorption air conditioner (not shown) uses, for example, water as a refrigerant and lithium bromide as an absorption liquid, and the water absorbed by the lithium bromide passes through the water-lithium bromide conduit 32a. Supplied to the absorption air conditioner regenerator 31. The absorption-type air conditioner regenerator 31 heats lithium bromide that has absorbed water by the heat medium and distills it to separate water and lithium bromide. The separated water is discharged from the drainage conduit 32b, separated by the distillation, and regenerated lithium bromide is re-supplied to the absorption air conditioner via the lithium bromide conduit 32c.

  Next, FIG. 5 shows another internal combustion engine system 41 of the present embodiment. The internal combustion engine system 41 includes a fuel tank 42 that contains a mixed fuel of ethanol and at least one of gasoline and GTL naphtha, and water is added to the mixed fuel supplied from the fuel tank 42 to produce an ethanol-water mixture. And a separator 43 that separates liquid hydrocarbons such as gasoline, GTL naphtha, or a mixed fuel of gasoline and GTL naphtha, and the first conduit 5a and the third conduit 5c are connected to the separator 43. Except this, it has the completely same configuration as the internal combustion engine system 1 shown in FIG.

  However, in the internal combustion engine system 31, the ethanol-water mixture obtained in the separator 43 is supplied to the first injector 6a of the internal combustion engine 3 through the first conduit 5a. In the reformer 9, the ethanol-water mixture supplied from the distributor 8 via the second conduit 5b is brought into contact with the catalyst under heating to reform the mixture into a diethyl ether-water mixture. The diethyl ether-water mixture obtained in the reformer 9 is supplied to the second injector 6b through the second conduit 5b.

  Then, the fuel supply control means 10 adjusts the mixing ratio of the ethanol-water mixture, the diethyl ether-water mixture, and the liquid hydrocarbon supplied to the internal combustion engine 3.

  In the internal combustion engine system 41, the action of the heating medium is the same as that in the internal combustion engine system 1 except that ethanol is replaced with an ethanol-water mixture and diethyl ether is replaced with a diethyl ether-water mixture. is there.

1 is a system configuration diagram showing a configuration example of an internal combustion engine system of the present invention. The system block diagram which shows the structure of the engine room in the internal combustion engine system shown in FIG. Action explanatory drawing explaining the one aspect | mode of the effect | action of the heat medium in the system of FIG. Action explanatory drawing explaining the other aspect of the effect | action of the heat medium in the system of FIG. The system block diagram which shows the other structural example of the internal combustion engine system of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,31 ... Internal combustion engine system, 3 ... Internal combustion engine, 4a ... 1st fuel tank, 4b ... 2nd fuel tank, 9 ... Reforming means, 9b ... Ethanol heating means, 10 ... Fuel supply control apparatus, 14 ... Heat exchange means, 18 ... intake air heating means, 27 ... flow control means, 29 ... heat insulation storage container, 30a ... first temperature detection means, 30b ... second temperature detection means, 42 ... fuel tank, 43 ... separation means.

Claims (9)

In an internal combustion engine system capable of switching between a spark ignition operation and a premixed compression ignition operation,
A first fuel tank containing ethanol;
A second fuel tank containing at least one of gasoline and GTL naphtha;
Reforming means for reforming by heating a part of ethanol supplied from the first fuel tank to the internal combustion engine and bringing it into contact with the catalyst to obtain diethyl ether;
Heat exchange means for exchanging heat between the exhaust heat of the internal combustion engine and the heat medium to heat the heat medium;
Ethanol heating means for heating ethanol supplied to the reforming means by the heat medium heated by the heat exchange means;
The ethanol supplied from the first fuel tank to the internal combustion engine, at least one of gasoline and GTL naphtha supplied from the second fuel tank to the internal combustion engine, and supplied from the reforming means to the internal combustion engine An internal combustion engine system comprising fuel supply control means for controlling a mixing ratio with diethyl ether. In an internal combustion engine system capable of switching between a spark ignition operation and a premixed compression ignition operation,
A first fuel tank containing ethanol;
A second fuel tank containing at least one of gasoline and GTL naphtha;
Reforming means for reforming by heating a part of ethanol supplied from the first fuel tank to the internal combustion engine and bringing it into contact with the catalyst to obtain diethyl ether;
Heat exchange means for exchanging heat between the exhaust heat of the internal combustion engine and the heat medium to heat the heat medium;
Intake air heating means for heating the intake air of the internal combustion engine by the heat medium heated by the heat exchange means;
The ethanol supplied from the first fuel tank to the internal combustion engine, at least one of gasoline and GTL naphtha supplied from the second fuel tank to the internal combustion engine, and supplied from the reforming means to the internal combustion engine An internal combustion engine system comprising fuel supply control means for controlling a mixing ratio with diethyl ether.   The internal combustion engine system according to claim 2, further comprising an ethanol heating unit that heats ethanol supplied to the reforming unit by the heat medium heated by the heat exchange unit. In an internal combustion engine system capable of switching between a spark ignition operation and a premixed compression ignition operation,
A fuel tank containing a mixed fuel comprising ethanol and at least one of gasoline and GTL naphtha;
Separation means for adding water to the mixed fuel supplied from the fuel tank to separate at least one of the gasoline and GTL naphtha and an ethanol-water mixture;
Reforming means for heating a part of the ethanol-water mixture supplied from the separation means to the fuel tank and bringing it into contact with the catalyst to obtain a diethyl ether-water mixture;
Heat exchange means for exchanging heat between the exhaust heat of the internal combustion engine and the heat medium to heat the heat medium;
Ethanol heating means for heating the ethanol-water mixture supplied to the reforming means by the heat medium heated by the heat exchange means;
Fuel supply for controlling a mixing ratio of ethanol supplied from the separation means to the internal combustion engine, at least one of gasoline and GTL naphtha, and a diethyl ether-water mixture supplied from the reforming means to the internal combustion engine An internal combustion engine system comprising a control means. In an internal combustion engine system capable of switching between a spark ignition operation and a premixed compression ignition operation,
A fuel tank containing a mixed fuel comprising ethanol and at least one of gasoline and GTL naphtha;
Separation means for adding water to the mixed fuel supplied from the fuel tank to separate at least one of the gasoline and GTL naphtha and an ethanol-water mixture;
Reforming means for heating a part of the ethanol-water mixture supplied from the separation means to the fuel tank and bringing it into contact with the catalyst to obtain a diethyl ether-water mixture;
Heat exchange means for exchanging heat between the exhaust heat of the internal combustion engine and the heat medium to heat the heat medium;
Intake air heating means for heating the intake air of the internal combustion engine by the heat medium heated by the heat exchange means;
Fuel supply for controlling a mixing ratio of ethanol supplied from the separation means to the internal combustion engine, at least one of gasoline and GTL naphtha, and a diethyl ether-water mixture supplied from the reforming means to the internal combustion engine An internal combustion engine system comprising a control means.   6. The internal combustion engine system according to claim 5, further comprising ethanol heating means for heating the ethanol-water mixture supplied to the reforming means by the heat medium heated by the heat exchange means. Internal combustion engine system.   7. The internal combustion engine system according to claim 1, wherein a spark ignition operation is performed at a high load, and a premixed compression ignition operation is performed at a low load.   The internal combustion engine system according to any one of claims 1 to 7, wherein the heat medium heated by the heat exchange means is accommodated and stored in an adiabatic state while the internal combustion engine is stopped. An internal combustion engine system comprising an insulated storage container.   9. The internal combustion engine system according to claim 8, wherein first temperature detection means for detecting a temperature of the heat insulation storage container, and second temperature detection means for detecting a temperature of the heat medium heated by the heat exchange means. During operation of the internal combustion engine, the heat medium is supplied to the heat insulating storage container only when the temperature detected by the first temperature detection means is higher than the temperature detected by the second temperature detection means. An internal combustion engine system comprising distribution control means for distribution.

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