JP6468877B2 - Heat storage body arranged in an exhaust pipe of an internal combustion engine, control device for the heat storage body, and control method for the heat storage body - Google Patents

Description

  The present invention relates to a heat storage body arranged in an exhaust pipe of an internal combustion engine, a control device for the heat storage body, and a control method for the heat storage body.

  In order to comply with the regulations regarding the exhaust gas (exhaust gas) component of the internal combustion engine in recent years, various exhaust gas purification devices are arranged in the exhaust pipe path of the internal combustion engine. These exhaust gas purifiers purify exhaust gas components by chemical reaction between chemical substances such as catalyst and urea water and exhaust gas components such as NOx and PM (Particulate Matter). There is a temperature range that exhibits a good purification performance. On the other hand, the exhaust gas temperature tends to decrease as the combustion efficiency in the internal combustion engine improves. Thus, a technique has been proposed in which a heating device or a heat storage body is arranged in the exhaust pipe path to set the temperature of the exhaust pipe path to a desired temperature (for example, Patent Documents 1 and 2). Moreover, the technique which adjusts exhaust gas temperature by combining a heating apparatus and post injection is proposed (for example, patent document 3).

Japanese Patent No. 3626197 JP 2010-261423 A JP 2014-118874 A

  However, in the technique using the heat storage body, when the temperature of the heat storage body itself is low, there is a problem that the exhaust gas temperature cannot be reduced by contacting the heat storage body and the exhaust gas cannot be purified. Further, the technology using the heating device has a problem that the exhaust gas temperature cannot be set to the optimum operating temperature range of the purification device by effectively utilizing the energy generated as the vehicle travels.

  Therefore, there is a demand for a technology that can efficiently exhibit the performance of the purification device while improving the energy efficiency of the entire vehicle without depending on the temperature of the exhaust gas discharged from the internal combustion engine.

  The present invention has been made to solve the above-described problems, and can be realized as the following aspects.

  A 1st aspect provides the thermal storage body arrange | positioned at the exhaust pipe line of an internal combustion engine. The heat storage body according to the first aspect is a heat storage member, a first heat generation member used for storing heat in the heat storage member, and a second heat generation member different from the first heat generation member, A second heat generating member that generates heat separately from the first heat generating member.

  According to the heat storage body according to the first aspect, the performance of the purification apparatus can be efficiently exhibited while improving the energy efficiency of the entire vehicle without depending on the temperature of the exhaust gas discharged from the internal combustion engine.

  In the heat storage body according to the first aspect, the ratio of the surface area in contact with the heat storage member to the total surface area of the first heat generating member is higher than the ratio of the surface area in contact with the heat storage member to the total surface area of the second heat generating member. It may be large. In this case, heat can be stored in the heat storage member by the first heat generating member.

  In the heat storage body according to the first aspect, the second heat generating member is composed of a metal corrugated sheet or a metal corrugated sheet and a flat plate laminated via a spacing part, and the spacing part is An exhaust gas flow path section through which exhaust gas flows may be formed. In this case, the second heat generating member can also function as a heat exchanging portion, and the heat exchange efficiency between the exhaust gas and the second heat generating member can be improved.

  In the heat storage element according to the first aspect, the first heat generating member may be included in the heat storage member. In this case, the heat storage member can be heated more efficiently, and the heat storage member can be efficiently stored.

  The heat storage body according to the first aspect may further include a housing that includes the first heat generating member and the heat storage member to form a first heater. In this case, a heat storage member such as powder or liquid can be used as the heat storage member.

  The heat storage body according to the first aspect may further include a second heat storage member disposed between the first heater and the second heat generating member. In this case, the heat storage performance of the heat storage body can be improved.

  In the heat storage body according to the first aspect, one electrode of each of the first heat generation member and the second heat generation member may have the same potential, and further includes a housing that covers the heat storage body. The one electrode of each of the first heat generating member and the second heat generating member and the housing may be at the same potential. In this case, wiring can be simplified.

  In the heat storage body according to the first aspect, regenerative electric power generated during deceleration of the vehicle may be supplied to the first heat generating member. In this case, it is possible to store heat in the heat storage member with regenerative power, and the energy efficiency of the entire vehicle can be improved.

  The second aspect includes a first heat generating member, a second heat generating member, and a heat storage member disposed between the first heat generating member and the second heat generating member. Provided is a control device for a heat storage body arranged in an exhaust pipe. A control device according to a second aspect includes a first switching unit that switches a supply destination of power generated when the vehicle is driven to either a battery or the first heat generating member, and the vehicle under a predetermined condition. A control unit that switches the first switching unit to supply the generated electric power to the first heat generating member during deceleration.

  According to the control device according to the second aspect, the performance of the purification device can be efficiently exhibited while improving the energy efficiency of the entire vehicle without depending on the temperature of the exhaust gas discharged from the internal combustion engine.

  The control device according to the second aspect further includes a second switching unit that electrically connects or disconnects the battery and the second heat generating member, and the control unit starts the vehicle under a predetermined condition. Sometimes, the second switching unit may be switched so as to electrically connect the battery and the second heat generating member. In this case, it is possible to promote an increase in the temperature of the exhaust gas when starting the vehicle under a predetermined condition.

  The control device according to the second aspect further includes a temperature detector on the exhaust side of the heat storage body, and the first switching unit further electrically connects or disconnects the battery and the first heat generating member. And when the temperature detected by the temperature detector is equal to or lower than a predetermined temperature, the control unit switches the first switching unit to electrically connect the battery and the first heat generating member. The second switching unit may be switched so that the battery and the second heat generating member are electrically connected. In this case, the temperature rise of the exhaust gas can be controlled using a battery according to the driving state of the vehicle.

  A third aspect includes a first heat generating member, a second heat generating member, and a heat storage member disposed between the first heat generating member and the second heat generating member. A method for controlling a heat storage body disposed in an exhaust pipe is provided. The control method according to the third aspect determines whether or not the vehicle is in a decelerating state, and when it is determined that the vehicle is in a decelerating state, stops supplying power to the second heat generating member. Supplying electric power generated as the vehicle decelerates directly to the first heat generating member.

  According to the control method concerning the 3rd mode, the same operation effect as the 2nd control device can be acquired. The control method according to the third aspect can be realized in various aspects in the same manner as the second control apparatus.

It is explanatory drawing which shows roughly a vehicle provided with the exhaust gas purification system used in this embodiment. It is a perspective sectional view showing the internal configuration of the heat storage element used in this embodiment. It is sectional drawing which cut | disconnected the thermal storage body used in this embodiment shown in FIG. 1 by the 3-3 line. It is a block diagram which shows roughly the electrical connection between the electrical components in a vehicle provided with the thermal storage body which concerns on this embodiment. It is a flowchart which shows a process routine in order to control operation | movement of the thermal storage body in this embodiment. It is explanatory drawing which shows typically the longitudinal cross-section of the thermal storage body which concerns on 1st Embodiment. It is explanatory drawing which shows typically the cross section of the thermal storage body which concerns on 1st Embodiment. It is explanatory drawing which shows typically the longitudinal cross-section of the thermal storage body which is a modification of the thermal storage body which concerns on 1st Embodiment. It is explanatory drawing which shows typically the cross section of the thermal storage body which is a modification of the thermal storage body which concerns on 1st Embodiment. It is explanatory drawing which shows typically the longitudinal cross-section of the thermal storage body which concerns on 2nd Embodiment. It is explanatory drawing which shows typically the longitudinal cross-section of the thermal storage body which concerns on 3rd Embodiment. It is explanatory drawing which shows typically the longitudinal cross-section of the thermal storage body which concerns on 4th Embodiment. It is explanatory drawing which shows typically the cross section of the thermal storage body which concerns on 4th Embodiment. It is explanatory drawing which shows typically the longitudinal cross-section of the thermal storage body which concerns on 5th Embodiment. It is explanatory drawing which shows typically the longitudinal cross-section of the thermal storage body which is a modification of the thermal storage body which concerns on 5th Embodiment. It is explanatory drawing which shows typically the longitudinal cross-section of the thermal storage body which concerns on 6th Embodiment. It is explanatory drawing which shows typically the longitudinal cross-section of the thermal storage body which concerns on 7th Embodiment.

First embodiment:
As an embodiment of the exhaust gas purification system and the heating element used in the exhaust gas system according to the present invention, a vehicle including a diesel engine (internal combustion engine) will be described below as an example. FIG. 1 is an explanatory diagram schematically showing a vehicle equipped with an exhaust gas purification system used in the present embodiment.

  The vehicle 500 includes a diesel engine (hereinafter referred to as “engine”) 510, four wheels 520, and an exhaust gas purification system 10. The engine 510 uses light oil as fuel, outputs driving force by the explosive combustion of the fuel, and the exhaust system is equipped with exhaust gas containing NOx (nitrogen oxide) and PM (particulate matter) accompanying the explosive combustion. It is discharged into the atmosphere through the purification system 10.

The purification system 10 includes various exhaust gas purification devices on the exhaust pipe 11 (exhaust pipe line). The exhaust pipe 11 is connected to the engine 510 via the manifold 11a on the engine 510 side (upstream side of the exhaust gas flow), and includes a muffler end pipe 11b on the most downstream side of the exhaust gas flow. The purification system 10 includes a diesel oxidation catalyst (DOC) 12, a diesel particulate filter (DPF) 13, a heat storage body 20, a selective catalyst reduction device (SCR) 14 and an ammonia slip diesel oxidation catalyst (NH) from the upstream side of the exhaust gas flow. ₃ DOC) 15 is provided on the exhaust pipe 11. A fuel injection device 17 may be disposed upstream of the DOC 12 on the exhaust pipe 11, and a urea water injection device 18 is disposed upstream of the SCR device 14. In addition, a first temperature sensor 191 is disposed in the heat storage body 20, and a second temperature sensor 192 is disposed in the SCR device 14. The first temperature sensor 191 and the second temperature sensor 192 may be provided either upstream or downstream of the heat storage body 20 or upstream or downstream of the SCR device 14. The heat storage body 20 and the SCR device may be provided. 14 may be replaced by a temperature sensor disposed between the two. The term “on the exhaust pipe” in this embodiment means both the inside of the exhaust pipe and the middle of the exhaust pipe (which constitutes a part of the exhaust pipe).

The diesel oxidation catalyst 12 supports a noble metal such as platinum (Pt) or palladium (Pd) as a catalyst, and oxidizes carbon monoxide (CO) and hydrocarbon (HC), which are unburned gas components contained in the exhaust gas. Then, it is converted into carbon dioxide (CO ₂ ) and water (H ₂ O), and nitric oxide (NO) contained in the exhaust gas is oxidized to be converted into nitrogen dioxide (NO ₂ ).

The diesel particulate filter 13 is a filter that collects particulate matter (PM) contained in the exhaust gas through a fine gap in the porous ceramic. A metal catalyst such as platinum is applied to the porous surface, and the diesel particulate filter 13 has a particulate matter in an atmosphere of 250 to 300 ° C. in the presence of NO ₂ generated by the diesel oxidation catalyst 12. It is naturally regenerated by causing a chemical reaction with the catalyst and converting it to carbon dioxide (CO ₂ ) and water (H ₂ O). The diesel particulate filter 13 supplies fuel to the diesel oxidation catalyst 12 directly from the engine 510 via the fuel injection device 17 or through an exhaust stroke, and catalytically combusts fuel-derived hydrocarbons to increase the exhaust temperature. It can also be regenerated by forced regeneration in which the particulate matter collected at 450 ° C. or higher is oxidized.

The selective catalytic reduction (SCR) device 14 is a device that carries a zeolite-based catalyst or a vanadium-based catalyst and selectively reduces NOx. In the selective catalyst reduction device 14, in general, urea water is sprayed on the exhaust gas by the urea water injection device 18 at the upstream side of the selective catalyst reduction device 14, and ammonia (NH ₃₎ passes through thermal decomposition and hydrolysis reaction of urea water. ) And the NOx component in the exhaust gas is converted into nitrogen (N ₂ ) and water (H ₂ O). Therefore, the exhaust gas temperature is required to be an appropriate temperature, for example, a temperature of 200 ° C. or higher, in order to obtain ammonia from the urea water, in the upstream stage of the selective catalyst reduction device 14.

  The ammonia slip / diesel oxidation catalyst 15 supports the same catalyst as the diesel oxidation catalyst 12 and oxidizes and decomposes ammonia that has not been subjected to the reaction in the selective catalytic reduction device 14 to generate nitrogen or NOx.

  The heat storage body 20 according to the present embodiment will be described in detail below. FIG. 2 is a perspective sectional view showing the internal configuration of the heat storage body used in the present embodiment. FIG. 3 is a cross-sectional view of the heat storage body used in the present embodiment shown in FIG. 1 cut along line 3-3.

  The heat storage body 20 includes a case 21 (housing) including an outer case 211 and an inner case 212, a first heat generation member 301, a heat storage member 302, a second heat generation member 311, an upstream lid 261, a downstream lid 262, and a rectification. A member 263 is provided. As will be described later, the second heat generating member 311 is formed by laminating a plurality of metal flat plates or corrugated plates, or metal flat plates and corrugated plates via spaced portions. It functions as an exhaust gas flow path (flow path section).

  The outer case 211 and the inner case 212 are formed of stainless steel and a steel plate that has been subjected to an antioxidant treatment. The main body portions 211a and 212a have straight cylindrical shapes, and the main body portion 211a on the exhaust gas introduction side and the exhaust side, respectively. It has introduction parts 211b and 212b and discharge parts 211c and 212c having a smaller diameter than 212a. The outer case 211 and the inner case 212 are connected to each other by main body portions 211a and 212a, introduction portions 211b and 212b, and discharge portions 211c and 212c by connection portions having a substantially truncated cone shape having an inclination in a sectional view. The flow of the exhaust gas from 211b, 212b to the main body portions 211a, 212a and the main body portions 211a, 212a to the discharge portions 211c, 212c is made smooth.

  The introduction part 212b and the discharge part 212c of the inner case 212 are coupled to the upstream cover 261 and the downstream cover 262, and the upstream cover 261 and the downstream cover 262 are connected to the introduction part 211b and the discharge part 211c of the outer case 211, respectively. By being engaged, the inner case 212 is held in the outer case 211. A heat insulating material may be arranged on the inner wall surface of the inner case 212 in order to suppress heat conduction through the case 21. In order to further suppress heat dissipation to the atmosphere regardless of the presence or absence of the heat insulating material, a space as a heat insulating space is formed between the outer case 211 and the inner case 212.

  The heat insulating material is desirably disposed over the outer periphery of the second heat generating member 311 and is made of, for example, a ceramic sheet material, a cylindrical hard material, or the like. By providing the heat insulating material, the heat conduction amount to the metal inner case 212 can be suppressed, and the heat retention efficiency of the heat storage body 20 can be maintained at a desired level.

  The upstream lid 261 and the downstream lid 262 are cylindrical members made of porous metal or porous ceramic having a plurality of flow paths (holes in front view) through which exhaust gas flows. The upstream lid 261 and the downstream lid 262 are arranged for heat insulation in the flow direction of the exhaust gas, and maintain heat in the heat storage body 20. A cylindrical rectifying member 263 whose opening is in contact with the upstream lid 261 is disposed in the introduction portion 212 b of the inner case 212. The rectifying member 263 includes a plurality of holes on the peripheral surface on the bottom surface side, and rectifies the flow of the exhaust gas so that the exhaust gas introduced from the introduction portion 212b diffuses in the radial direction of the inner case 212. As a result, the exhaust gas uniformly spreads to the separation portion (not shown) of the second heat generating member 311. When the exhaust gas temperature is higher than the temperature of the heat storage member 302, the heat storage member 302 absorbs the heat energy of the exhaust gas and increases the temperature of the heat storage member 302 to maintain (heat storage). When the temperature is lower than the temperature of the member 302, the stored thermal energy is released and the exhaust gas is heated. That is, heat exchange based on the temperature difference between the exhaust gas and the heat storage member 302 is performed.

  In the present embodiment, the first heat generating member 301 is used to heat (heat) the heat storage member 302 to store a predetermined amount of heat in the heat storage member 302, and the second heat generating member 311 is a heat storage body. It is used to heat the exhaust gas introduced into 20. The first heat generating member 301 and the second heat generating member 311 are connected to the power supply circuit so that they can be turned on / off separately, that is, the heat generating members 301 and 311 are heated at different timings. obtain. In the present embodiment, the heat storage member 302 can store the necessary amount of heat by being heated by the first heat generating member 301 separately from the heat exchange with the exhaust gas.

  FIG. 4 is a block diagram schematically showing electrical connection between electrical components in a vehicle including the heat storage body according to the present embodiment. The vehicle 500 includes an alternator (generator) 40 that is driven by the driving force of the engine 510. The engine 510 includes an engine-side pulley 511 for providing the alternator 40 with a driving force (output) extracted from a crankshaft (not shown). The alternator 40 includes an alternator-side pulley 401 to which a driving force provided from the engine 510 is input. The engine-side pulley 511 and the alternator-side pulley 401 are mechanically connected by a belt 512, and the driving force of the engine 510 is transmitted to the alternator 40 via the belt 512.

  The vehicle 500 includes a vehicle auxiliary machine 41, a battery 42, a control unit 60, a first relay 61, a second relay 62, a third relay 63, a first temperature sensor 191, and a second temperature sensor 192. ing. The vehicle auxiliary machine 41 is an auxiliary machine that is used in conjunction with vehicle travel that is driven (consumes electric power) by the electric power output from the alternator 40 or the electric power stored in the battery 42. This applies to navigation systems and electric heaters.

  The output terminal of the alternator 40 is electrically connected to the first heat generating member 301 provided in the heat storage body 20 via the first relay 61 and connected to the vehicle auxiliary machine 41 via the third relay 63. It is electrically connected and further electrically connected to the plus terminal (+) of the battery 42 via the ammeter 64. The positive terminal (+) of the battery 42 is electrically connected to the second heat generating member 311 provided in the heat storage body 20 via the second relay 62. A DC / DC converter for stepping up or stepping down the voltage may be arranged on the wiring path from the alternator 40 to the vehicle auxiliary equipment 41 and the battery 42. Further, the DC / DC converter may be arranged between the alternator 40 and the first heat generating member 301. The wire diameter can be reduced by increasing the supply voltage. The grounding side terminals of the alternator 40, the vehicle auxiliary equipment 41, and the first and second heat generating members 301 and 311 are electrically connected to the negative terminal (−) of the battery 42 through the body ground. In addition, the ground side terminals 301a and 311a which are one terminals of the first and second heat generating members 301 and 311 may be set to the same potential (connected) in the heat storage body 20 and may be body-grounded. In this case, it is possible to use a single ground line from both heat generating members 301 and 311 to the vehicle body. Further, the ground-side terminals 301a and 302a, which are one terminals of the first and second heat generating members 301 and 311, are further set to the same potential as the case 21 of the heat storage body 20 (connected), and the case 21 to the vehicle body The body may be grounded through a single (common) ground line 21a (see FIG. 6). In this case, a single ground line from the heat storage body 20 to the vehicle body can be provided.

  The first relay 61 is a switch for turning on or off the first heat generating member 301, that is, switching between supply and interruption of power to the first heat generating member 301. The second relay 62 is a switch for turning on or off the second heat generating member 311, that is, switching between supply and interruption of power to the second heat generating member 311. The third relay 63 is a switch that switches between supplying and shutting off the electric power generated by the alternator 40 for both the auxiliary machine 41 and the battery 42. The first to third relays 61 to 63 are connected to the control unit 60 via a control signal line, and are turned on (closed) or turned off (opened) by a control signal from the control unit 60. The ammeter 64 provides the detected output current of the battery 42 to the control unit 60 via the signal line. The first temperature sensor 191 is used to detect the temperature of the heat storage body 20, and the second temperature sensor 192 is used to detect the temperature of the SCR device 14, both of which are signal lines to the control unit 60. Connected with.

  In the present embodiment, the first relay 61 is turned on and the third relay 63 is turned off, so that the electric power generated by the alternator 40 is directly generated, that is, without being stored in the battery 42. The heat generating member 301 can be supplied. For example, when the vehicle 42 is in a fully charged state and the power output from the alternator 40 is surplus power, such as when the vehicle is decelerating, the alternator 40 is operated to generate power to generate heat in the first heat generating member 301. Can be supplied. The thermal energy generated by the first heat generating member 301 is absorbed by the heat storage member 302 and stored. As a result, the kinetic energy of the vehicle can be stored in the heat storage member 302 by being converted into electric energy and further heat energy without being discarded. As will be described later, the heat stored in the heat storage member 30 can be used to prompt the early function start of the exhaust gas purifying device during cold weather. On the other hand, in the present embodiment, the second heat generating member 311 generates heat by the power from the battery 42 by turning on the second relay 62. In the present embodiment, the first heat generating member 301 and the second heat generating member 311 are supplied with power from separate power supply systems.

  The operation control of the heat storage body 20 in this embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing a processing routine for controlling the operation of the heat storage body in the present embodiment. This processing routine is executed by the control unit 60. The control unit 60 includes at least an input / output interface (not shown) for exchanging control signals and detection signals with a central processing unit (CPU), a memory, and external devices.

  As a concept of operation control of the heat storage body 20 in the present embodiment, the control unit 60 causes the first heat generating member 301 to generate heat by the electric power (regenerative electric power) generated by the alternator 40 when the vehicle is decelerated. The electric power generated by the alternator 40 is also used for charging (storage) of the battery 42, and the electric power generated by the alternator 40 is supplied to either the first heat generating member 301 or the battery 42 by the first switching unit. Is done. The first switching unit can be realized by an on / off combination of the first relay 61 and the third relay 63. Note that regenerative power is not supplied to the first heat generating member 301 under a predetermined condition in which the heat storage member 302 is sufficiently stored. The control unit 60 controls the second relay 62 that electrically opens and closes between the battery 42 and the second heat generating member 311 at the time of starting under a predetermined condition such as low temperature starting, and the second heat generating member. 311 is energized to generate heat. The control unit 60 further energizes the first and second heat generating members 301 and 311 using the power of the battery 42 under the condition where the temperature of the heat storage body 20 is lower than a predetermined temperature (low temperature condition). Run. In the present embodiment, the first switching unit is realized by the first relay 61 and the third relay 63, but the first switching unit may be realized by one switch.

  The control unit 60 starts this processing routine when the vehicle is started, and detects the driving state of the vehicle by various sensors provided in the vehicle. For example, the control unit 60 determines whether or not the driving state of the vehicle is in a decelerating state (coasting state) based on an input signal input from an accelerator pedal opening sensor, and an elapsed time since the previous DPF regeneration process. Alternatively, it is determined whether or not the driving state of the vehicle is the DPF regeneration processing time based on the elapsed travel distance, and the SCR device 14 is subjected to the HC cover based on the input signal input from the temperature sensor arranged at the front stage of the SCR device. It is possible to determine whether or not the vehicle is in an operating state that requires heating to eliminate poison.

  The control unit 60 determines whether or not the driving state of the vehicle is in a decelerating state (step S100). When it is determined that the vehicle is in a decelerating state (step S100: Yes), the second relay 62 is turned off. (Step S102). When the input signal from the accelerator pedal opening sensor indicates that the accelerator pedal is in an off state (opening degree 0), the control unit 60 determines that the driving state of the vehicle is in a deceleration state (coasting state). When the second relay 62 is switched to the off position, the second heat generating member 311 is turned off (disconnected from the power circuit). The control unit 60 determines whether or not the second relay 62 is in the on position prior to transmission of the off signal (open signal) to the second relay 62, and only when the second relay 62 is in the on position. The off signal may be transmitted to the second relay 62, or the off signal may be transmitted to the second relay 62 regardless of the current position of the second relay 62.

  The control unit 60 determines whether or not the heat storage body temperature T1, which is the temperature of the heat storage body 20, is higher than the predetermined temperature Ta (step S104). The heat storage body temperature T1 of the heat storage body 20 is input to the control unit 60 via the first temperature sensor 191. In addition, it can be said that the heat storage body temperature T1 detected by the first temperature sensor 191 is an ambient temperature inside the heat storage body 20 or an exhaust gas temperature passing through the heat storage body 20. The predetermined temperature Ta is based on the amount of heat required for heating the exhaust gas when the driving state of the vehicle shifts from a deceleration state to a traveling state that requires driving by the engine 510 (maintenance at a constant speed or acceleration state). The threshold temperature obtained in advance. That is, it is possible to obtain the amount of heat that can be provided by the heat storage body 20 from the heat capacity of the heat storage body 20 (heat storage member 302) and the temperature of the heat storage body 20, and the minimum temperature for providing the required heat amount is a predetermined temperature. It can be obtained in advance as Ta.

  When it is determined that the heat storage body temperature T1 is higher than the predetermined temperature Ta (step S104: Yes), the control unit 60 turns off (opens) the first relay 61 (step S106). That is, when the heat storage body temperature T1 is higher than the predetermined temperature Ta, the heat storage member 302 in the heat storage body 20 is sufficiently stored, and heating and heat storage by the first heat generating member 301 are unnecessary. The relay 61 is turned off, and the heat generation by the first heat generating member 301 is stopped. Note that, under this condition, the third relay 63 is turned on or off according to the storage state (voltage) of the battery 42, and the storage of the battery 42 is executed or stopped.

  When determining that the heat storage body temperature T1 is equal to or lower than the predetermined temperature Ta (step S104: No), the control unit 60 turns off (opens) the third relay 63 and turns on (closes) the first relay 61. (Step S108). As a result, the electric power generated by the alternator 40 is directly supplied to the first heat generating member 301, the first heat generating member 301 generates heat, and the heat storage member 302 is heated. In general, when a vehicle is decelerated, the vehicle is decelerated by releasing kinetic energy as heat energy by a mechanical brake, or the vehicle is decelerated by an engine brake, for example. The drive of the alternator 40 at the vehicle deceleration timing is originally a drive using kinetic energy that is discarded as heat energy or the like, so that no new energy consumption is required. The electrical energy converted from the kinetic energy by driving the alternator 40 is further converted into thermal energy by the first heat generating member 301 and stored in the heat storage member 302 as heat energy. As described above, the heat energy stored in the heat storage member 302 is used to heat the exhaust gas, and as a result, the exhaust gas purification device can be operated at a proper operating temperature.

  In general, the alternator 40 has a configuration capable of changing and outputting an output voltage value. In the present embodiment, the third relay 63 is turned off, and the first heat generating member 301 is directly heated using the electric power generated by the alternator 40 without charging the battery 42. A voltage higher than the voltage can be output to the alternator 40 and the first heat generating member 301 can be operated, and the heat storage member 302 can be heated earlier and at a higher temperature.

  When the control unit 60 ends the process of step S106 or 108, the control unit 60 returns to the detection of the operating state. Note that this processing routine may be terminated when engine 510 is stopped (for example, the ignition key position is switched to the off position), or may be repeatedly executed at predetermined time intervals. When executed repeatedly at a predetermined time interval, after the step corresponding to each operation state is executed, only the determination regarding temperature is monitored in order to maintain the operation of the exhaust gas purifying device at an appropriate temperature. Then, the steps after the determination regarding the temperature may be executed.

  When the control unit 60 determines that the vehicle 500 is not in the decelerating state (step S100: No), the control unit 60 determines whether the driving state of the vehicle is in an operating state that requires DPF regeneration processing (step S110). Whether the driving state of the vehicle is in the driving state that requires the DPF regeneration processing is, for example, whether a predetermined time or a predetermined mileage has elapsed since the previous DPF regeneration processing, and further whether the engine 510 is in a load state (oil temperature). The determination based on the accelerator opening degree or the like) can be determined based on whether or not the high load operation state has passed a predetermined number of times or a predetermined time.

  When the control unit 60 determines that the driving state of the vehicle is in the DPF regeneration processing state (step S110: Yes), the control unit 60 turns off (opens) the first relay 61 and the second relay 62 (step S112), The relay 63 is turned on (closed) (step S114). During the DPF regeneration process, fuel is supplied directly from the engine 510 to the diesel oxidation catalyst 12 via the fuel injection device 17 or through an exhaust stroke, and fuel-derived hydrocarbons are catalytically combusted as compared with normal times. Since the high-temperature exhaust gas flows, generally, it is possible to realize an appropriate operating temperature of the SCR device 14 at the subsequent stage of the DPF 13 without causing the first heat generating member 301 and the second heat generating member 311 to generate heat. it can. In order to store the electric power generated by the alternator 40 in the battery 42, the control unit 60 turns on the third relay 63 to electrically connect the alternator 40 and the battery 42.

  The control unit 60 determines whether or not the temperature T2 of the SCR device 14 is higher than the predetermined temperature Tb (step S116). That is, it is determined whether or not the temperature T2 of the SCR device 14 is higher than a temperature necessary for eliminating HC poisoning in the SCR device 14, for example, 450 ° C. The control unit 60 can acquire the temperature of the SCR device 14 via the second temperature sensor 192. It can be said that the SCR device temperature T2 detected by the second temperature sensor 191 is the atmospheric temperature inside the SCR device 14 or the exhaust gas temperature introduced into the SCR device 14. Note that the temperature detected by the first temperature sensor 191 may be used without providing the second temperature sensor 192. That is, the temperature T1 of the heat storage body 20 can be regarded as the temperature T2 of the SCR device 14.

  When the control unit 60 determines that the temperature T2 of the SCR device 14 is higher than the predetermined temperature Tb (step S116: Yes), it is unnecessary to heat the SCR device 14 by increasing the exhaust gas temperature. Determine and return to detection of driving condition.

  On the other hand, when the control unit 60 determines that the temperature T2 of the SCR device 14 is equal to or lower than the predetermined temperature Tb (step S116: No), the control unit 60 turns on the second relay 62 and turns on the second heat generating member 311. Heat is generated (step S118), and the exhaust gas introduced into the heat storage body 20 is heated to increase the temperature T2 of the SCR device 14 disposed downstream (downstream) of the heat storage body 20. Depending on the exhaust gas temperature increase control accompanying the DPF regeneration process, exhaust gas having a sufficiently high temperature (for example, a temperature higher than the predetermined temperature Tb) may not reach the SCR device 14 in some cases. In this case, the temperature of the exhaust gas introduced into the SCR device 14 can be raised by energizing the second heat generating member 311 to generate heat.

  If the exhaust gas temperature cannot be raised to the predetermined temperature Tb by the heating by the second heat generating member 311, the first heat generating member 301 may be energized to generate heat. Whether or not the exhaust gas temperature can be raised to the predetermined temperature Tb is determined, for example, by whether or not the temperature T2 detected by the second temperature sensor 192 is equal to or lower than a predetermined temperature lower than the predetermined temperature Tb. It may be judged. The energization of the detected first heating member 301 at the temperature may be executed using either the electric power generated by the alternator 40 or the electric power of the battery 42.

  When the control unit 60 finishes energizing the second heat generating member 311, the control unit 60 returns to the detection of the operation state.

  If the control unit 60 determines that the vehicle 500 is in a state other than the deceleration state and the DPF regeneration processing state (step S110: No), is the temperature T2 of the SCR device 14 higher than the predetermined temperature Tc? It is determined whether or not (step S120). The driving state of the vehicle in other states includes, for example, engine start, engine idling, acceleration, and the like. The predetermined temperature Tc is for heating the exhaust gas in consideration of the amount of heat obtained with the operation of the first heat generating member 301 at the time of deceleration described above when the driving state of the vehicle is in the deceleration state. It is a threshold temperature obtained in advance based on the required heating required heat amount. That is, it is possible to obtain the amount of heat necessary for efficiently purifying NOx in the SCR device 14 from the heat capacity of the SCR device 14 and the temperature of the SCR device 14, and the necessary amount of heat after subtracting the amount of heat obtained during deceleration. Can be obtained in advance as the predetermined temperature Tv. Alternatively, the predetermined temperature Tc may be a temperature at which the conversion (hydrolysis) from urea water to ammonia is appropriately realized in the SCR device 14, for example, 200 ° C. Immediately after starting the engine, it is required to operate the SCR device 14 appropriately to purify the exhaust gas. From this viewpoint, the predetermined temperature Tc may be determined. In addition, it is desirable that the urea water injection is performed under a condition where the exhaust gas flow rate is small, such as an idling state or a light load state. The amount of heat required to increase the temperature of the exhaust gas under the condition where the exhaust gas flow rate is low is smaller than the amount of heat required to increase the temperature of the exhaust gas under the condition where the exhaust gas flow rate is high. It is because it can be made.

  When the control unit 60 determines that the SCR device temperature T2 is higher than the predetermined temperature Tc (step S120: Yes), the control unit 60 turns off (opens) the first and second relays (step S122), and returns to the detection of the operating state. To do. In this case, the SCR device 14 is in an appropriate operating temperature range, and heating of the exhaust gas by the first heat generating member 301 and the second heat generating member 311 is not necessary. For example, even when the engine is started, if the time interval from the previous engine stop is short and a sufficient amount of heat is stored in the heat storage member 302, the exhaust gas is heated when passing through the heat storage body 20. Therefore, further heating by the first and second heat generating members 301 and 311 becomes unnecessary.

  When the control unit 60 determines that the SCR device temperature T2 is equal to or lower than the predetermined temperature Tc (step S120: No), the control unit 60 turns on (closes) the first and second relays (step S124), and uses the power of the battery 42 to The first heating member 301 and the second heating member 311 are caused to generate heat, and the process returns to the detection of the operating state. In this case, the SCR device 14 is not in an appropriate operating temperature range and requires heating by the first heat generating member 301 and the second heat generating member 311. For example, when the engine is started for the first time in a day, a sufficient amount of heat is not stored in the heat storage member 302. In order to raise the temperature of the exhaust gas, heating by the first and second heat generating members 301 and 311 is performed. Necessary. Note that the predetermined temperature Tc is further divided into two temperature thresholds. In the higher temperature range, only the second heat generating member 311 or the first heat generating member 301 generates heat, and in the lower temperature range, the first and second temperature thresholds are generated. The heat generating members 301 and 311 may generate heat. Furthermore, the electric power generated by the alternator 40 may be directly applied to the first heat generating member 301. In this case, since the battery 42 needs to be charged, the supply voltage by the alternator 40 is controlled to the rated voltage of the battery 42.

  A detailed configuration of the heat storage body 20 according to the present embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 is an explanatory view schematically showing a longitudinal section of the heat storage body according to the first embodiment. FIG. 7 is an explanatory view schematically showing a cross section of the heat storage body shown in FIG. In the present specification, the longitudinal section means a drawing in which the heat storage body is cut in parallel to the direction in which the exhaust gas flows, and the horizontal section means the heat storage body is cut in a direction perpendicular to the direction in which the exhaust gas flows. Refers to the drawing.

  The heat storage body 20 according to the present embodiment includes a heat storage member 302, a housing 303, and a second heat generation member 311 in a cross-sectional view centered on a first heat generation member 301 in a cylindrical case (housing) 21. It is arranged in a substantially concentric shape. The first heat generating member 301, the heat storage member 302, and the housing 303 can be defined as the first heater (heater) 30. As will be described later, when a solid member such as ceramics is used as the heat storage member 302, the housing 303 is unnecessary, and the first heater 30 is configured by the first heat generating member 301 and the heat storage member 302.

  The first heater 30 has a rod-like outer shape extending in the flow direction of the exhaust gas in the case 21. The heating member in the present embodiment is a resistance heating element that is not covered with an insulating material and heats itself by energizing the member, and is a linear or stainless steel material such as nichrome wire, copper wire, tungsten wire, It is a plate-like bare metal material such as a copper material or an aluminum material. In addition, the heat generating member in the present embodiment may be formed of a nonmetallic material such as silicon carbide or carbon that has a small heat capacity and does not function as a heat storage body.

  The first heat generating member 301 is a linear heat generating member, and is disposed in parallel with the flow direction of the exhaust gas in the case 21 and along the central axis of the case 21. A positive lead wire (not shown) that is electrically connected to the positive terminal of the power source extends from one end of the first heat generating member 301, and a negative lead wire that is grounded extends from the other end 301a. The lead wire (+) of the first heat generating member 301 is led to the outside of the case 21 through a lead wire extraction hole formed at an arbitrary position on the side surface of the case 21 and connected to the first relay 61 for grounding. The lead wire (−) is connected to the grounding wire 21a of the case 21 or the grounding wire of the second heat generating member 311 inside or outside the case 21, and is grounded. The first heat generating member 301 may have an I-shape and lead wires are provided on both sides, may be U-shaped (folded shape) and may have a lead wire on one side, or may have a plurality of turns. The lead wire may be provided on both sides or one side.

The heat storage member 302 is, for example, a powdered inorganic insulator such as magnesia, and is filled around the first heat generating member 301 in a cylindrical housing 303 formed of a stainless material. In addition, as the heat storage member 303, a sensible heat storage material such as stainless steel, mild steel, a ceramic material, a sintered body of metal powder, or a metal honeycomb can be used. Note that when the heat storage member 303 is made of metal, an insulating member is disposed between the first heat generating member 301 and the heat storage member 303. Further, as the heat storage member 303, an aluminum latent heat storage material, a nitrate-based molten salt such as LiNO ₂ or NaNO _2, a chloride-based molten salt such as LiCl or NaCl, or an alkali metal carbonate-based molten salt such as LiCO ₂ or K ₂ CO ₂ A latent heat storage material such as salt that is a solid phase at room temperature and phase transitions to a liquid phase by the heat of exhaust gas may be used. When a latent heat storage material is used, the latent heat storage material is sealed in a bag-like container and disposed around the first heat generating member 301. The sensible heat storage material and the latent heat storage material may be used in combination.

  As the first heater 30, a cartridge heater in which two lead wires extending from an electrode connected to the heat generating member 301 extend from one end can be used. Although two lead wires are not shown in FIG. 6 for ease of explanation, the lead wire (+) of the first heater 30 is a lead formed at an arbitrary position on the side surface of the case 21. The lead wire is led out of the case 21 through the wire lead-out hole and connected to the first relay 61, and the ground lead wire (-) is connected to the ground wire of the case 21 or the ground wire of the second heat generating member 311. Is done.

  The second heat generating member 311 is a heat generating member that is formed by concentrically stacking a plurality of plate-shaped metal materials that are cylindrically spaced apart from each other at a predetermined interval. . The plate material may have either a corrugated shape or a flat plate shape, and the corrugated shape and the flat plate shape may be used in combination. The separation portion 312 that separates the cylindrical materials at a predetermined interval functions as an exhaust gas passage portion through which exhaust gas flows. Note that each cylindrical metal material constitutes one second heat generating member 311, but in this specification, an aggregate of each cylindrical body is collectively referred to as a second heat generating member 311, The cylindrical body is referred to as each second heat generating member 311. The second heat generating members 311 are coupled and supported by a support member (not shown). The second heat generating member 311 may be formed by winding a single metal plate in a spiral shape. In this case, one end of the second heat generating member 311 may be a fixed end coupled to the housing 303 of the first heater 30, and the other end is a free end located close to the inner wall surface of the case 21. There may be. Alternatively, one end of the second heat generating member 311 may be a free end disposed in the vicinity of the housing 303 of the heater 30, and the other end may be a fixed end coupled to the inner wall surface of the case 21.

  In the present embodiment, the ratio of the surface area in contact with the heat storage member 302 to the total surface area of the first heat generating member 301 is the first surface area of the first heater 30 with or without the housing 303. The ratio of the surface area in contact with the heat storage member 302 to the total surface area of the second heat generating member 311 is larger. Therefore, it can be said that the first heat generating member 301 can heat the heat storage member 302 more efficiently, and can be used to heat the heat storage member 302, and the second heat generating member 311 can be used as the first heat generating member 311. When compared with this heat generating member, the heat storage member 302 cannot be heated efficiently, and it can be said that the heat generating member is used for heating the exhaust gas.

  One end of the second heat generating member 311 and the other end 311a opposed to the one end are provided with lead wires (the lead wire connected to one end is not shown). The lead wire (+) of the second heat generating member 311 is led to the outside of the case 21 through a lead wire extraction hole formed at an arbitrary position on the side surface of the case 21 and connected to the second relay 62 for grounding. The lead wire (−) is connected to the grounding wire 21a of the case 21 or the grounding wire of the first heat generating member 301 inside or outside the case 21, and is grounded. However, when the other end of the second heat generating member 311 is a fixed end coupled to the inner wall surface of the case 21, the grounding lead wire in the second heat generating member 311 is not necessary.

  In addition to this, the second heat generating member 311 may be a mode in which a linear heat generating member similar to the first heat generating member 301 is arranged on a metal plate or a plate-like material made of an insulating material. In this case, energization is performed on the linear heat generating member, and direct energization is not performed on the plate-like material. According to this aspect, the amount of heat obtained by the second heat generating member 311 can be set to a desired distribution by appropriately setting the arrangement of the linear heat generating members.

  The second heat generating member 311 has a large contact area with the exhaust gas because it is formed by winding a plate-like member, and serves as a heat exchanger for exchanging heat with the exhaust gas. It also has a function. In order to improve the function as a heat exchanger, the plate-like material constituting the second heat generating member 311 may have a plurality of sharp holes, and the plate-like material having a mesh structure as the plate-like material. May be used.

  According to the heat storage body 20 according to the first embodiment described above, the heat storage member 302 can be heated and stored by the first heat generation member 301, and the exhaust gas can be heated. Heating of the exhaust gas can be started more quickly than in the case of heating the exhaust gas. In addition, since the electric power (so-called regenerative electric power) obtained by the power generation by the alternator 40 when the vehicle is decelerated is used as the electric power supplied to the first heat generating member 301, the exhaust gas can be used by effectively utilizing the kinetic energy of the vehicle. Can be heated. Moreover, since the structure which supplies directly with respect to the 1st heat generating member 301 from the alternator 40 is provided, it becomes possible to heat the 1st heat generating member 301 with a higher voltage, and heat storage member can produce a quick and higher calorie | heat amount rapidly. 302 can store heat.

  According to the heat storage body 20 according to the first embodiment, for example, when the vehicle is in an idling state, stopped by a start / stop function, or in an acceleration state, the heat storage body 20 (heat storage member 302). The exhaust gas can be heated by heat dissipation from the exhaust gas. Further, when the amount of heat required by the heat storage member 302 is insufficient for heating the exhaust gas, the insufficient amount of heat can be compensated by energizing the second heat generating member 311. Further, the insufficient heat quantity can be compensated by further energizing the first heat generating member 301. In particular, when power is supplied to the first heat generating member 301, power can be directly supplied from the alternator 40. Therefore, the first heat generating member 301 can be heated at a higher voltage, and a larger amount of heat can be supplied per unit time. Can get around. Therefore, when an exhaust gas purifying device that functions in a predetermined temperature range is provided in the subsequent stage (downstream side) of the heat accumulator 20, the operation of the purifying device under a wide range of conditions without depending on the operating state of the engine 510. It is possible to improve the operation ratio of the purification device.

  In the heat storage body 20 according to the first embodiment, the length of the second heat generating member 311 in the flow direction of the exhaust gas is shorter than that of the first heater 30, so that the exhaust gas passes through the second heat generating member 311. It is possible to reduce the pressure loss when passing and facilitate the smooth exhaust gas exhaust.

  The modification of the heat storage body 20 which concerns on a 1st aspect is demonstrated with reference to FIG. 8 and FIG. FIG. 8 is an explanatory view schematically showing a longitudinal section of a heat storage body which is a modification of the heat storage body according to the first embodiment. FIG. 9 is an explanatory view schematically showing a cross section of a heat storage body as a modification of the heat storage body according to the first embodiment. The heat storage body 20a according to the modified example includes a heat exchange member 313 in the separation portion 312 of the second heat generating member 311. The second heating member 311 and the heat exchange member 313 constitute a second heater 31. In this modification, the second heat generating member 311 may be linear or plate-like, but for the sake of explanation, a linear heat generating member is used in FIG. In addition, about the structure similar to the structure in the thermal storage body 20 which concerns on 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The heat exchange member 313 is disposed in contact with the outer surface of the housing 303 of the first heater 30 and also functions as a support material that supports the second heat generating member 311. By providing the heat exchange member 313, heat generated by the first heating member 301 included in the first heater 30 and heat stored in the heat storage member 303 are efficiently transferred to the exhaust gas. In addition, the heat generated by the second heat generating member 311 can be efficiently transferred to the exhaust gas. As the heat exchange member 313, a plate-shaped material having a two-dimensional or three-dimensional mesh structure, an expanded metal, or a honeycomb-shaped hollow rod-shaped material can be used. Although not shown in FIGS. 8 and 9, the heat exchange member 313 is disposed in the separation portion 312 that functions as an exhaust gas flow path, and includes a plurality of internal flow paths.

  FIG. 9 shows a configuration example including a linear second heat generating member 311 and a heat exchange member 313 made of a honeycomb-shaped hollow rod-shaped material. The second heat generating member 311 is fitted into a hole of the hollow rod-shaped material or the hollow rod-shaped material, and both are in contact with each other. As a result, the heat generated when the second heat generating member 311 generates heat is transmitted to the exhaust gas flowing through the holes through the hollow rod-shaped material. Further, the heat from the first heater 30 is also transmitted to the exhaust gas flowing in the holes in the same manner.

Second embodiment:
The heat storage body which concerns on 2nd Embodiment is demonstrated using FIG. FIG. 10 is an explanatory view schematically showing a longitudinal section of a heat storage body according to the second embodiment. The heat storage body 20b according to the second embodiment is the first implementation in that in addition to the heat storage member 302, the second heat storage member 32 is provided between the first heater 30 and the second heat generating member 311. It differs from the heat storage body 20a which is a modification of the heat storage body 20 which concerns on a form. In addition, about the structure similar to the structure in the thermal storage body 20 which concerns on 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The second heat storage member 32 is arranged such that one surface contacts the housing 303 of the first heater 30 and covers the first heater 30, and the other surface of the second heat storage member 32. Is in contact with the second heater 31. As the second heat storage member 32, the sensible heat storage material and the latent heat storage material described above can be used. However, since the second heat storage member 32 is disposed in the space between the first heater 30 and the second heater 31 that function as an exhaust gas flow path, the second heat storage member 32 has a shape that allows the exhaust gas to pass therethrough. For example, a porous body formed of an insulating material such as ceramics can be used. In the second embodiment, it is desirable that the thermal expansion coefficient (mainly, the housing 303) of the first heater 30 is larger than the thermal expansion coefficient of the second heat storage member 32. In this case, the first heater 30 and the second heat storage member 32 are filled by filling a gap generated in manufacturing with the second heat storage member 32 arranged on the outer periphery of the first heater 30. Adhesion can be improved. As a result, the heat conduction efficiency between the first heater 30 and the second heat storage member 32 can be improved.

  According to the heat storage body 20b according to the second embodiment, since the second heat storage member 32 is provided in addition to the heat storage member 303 provided in the first heater 30, the exhaust gas temperature is high. Can store the thermal energy of the exhaust gas in the second heat storage member 32, and can improve the heat storage performance and heat storage efficiency of the heat storage body 20b. For example, in a vehicle equipped with a so-called start / stop / idling stop function that frequently stops the engine 510, particularly in a hybrid vehicle that provides driving force with a motor and an engine, the engine stop time is long, and the heat storage body There is a case where the required heat capacity is increased. In such a case, the heat storage body 20b according to the second embodiment is useful, and the exhaust gas can be quickly raised to an appropriate temperature of the exhaust gas purifying device in various engine restart situations. The exhaust gas characteristics required for the vehicle can be satisfied.

  The exhaust gas purification system 10 according to the present embodiment includes a heat storage body 20b (20) according to the present embodiment in the previous stage of the SCR device 14. The DPF 13 is provided in the front stage of the heat storage body 20b, and the exhaust gas temperature discharged from the DPF 13 is about 600 ° C. during the regeneration process of the DPF 13. There is a risk of Since the exhaust gas purification system 10 according to this embodiment includes the heat storage body 20b between the DPF 13 and the SCR device 14, even if exhaust gas having a temperature exceeding 600 ° C. is discharged from the DPF 13, the heat storage body. For example, the exhaust gas whose temperature is lowered to about 400 ° C. can be discharged toward the SCR device 14 by 20b. As a result, thermal deterioration of the catalyst in the SCR device 14 can be suppressed or prevented.

Third embodiment:
With reference to FIG. 11, the thermal storage body 20c which concerns on 3rd Embodiment is demonstrated. FIG. 11 is an explanatory view schematically showing a longitudinal section of a heat storage body according to the third embodiment. In the heat storage body 20c according to the third embodiment, the heat storage member 302 has a flat plate shape having a predetermined thickness, and requires regulation by a powder body or a container enclosed in a container (not shown). It is formed from a solid having a regular shape. The first heat generating member 301 is not included in the heat storage member 302 and is disposed below or in contact with the heat storage member 302. The first heat generating member 301 in the third embodiment shown in FIG. 11 is arranged so as to intersect or orthogonal to the flow direction of the exhaust gas, and the surrounding space of the first heat generating member 301 is It can function as an exhaust gas flow path. The second heat generating member 311 is composed of a plurality of plate-like materials or a plurality of linear materials, and is arranged in parallel to the facing surface of the heat storage member 302 and separated from the facing surface. The separation distance of the first heat generation member 301 from the heat storage member 302 is shorter than the separation distance from the second heat generation member 311 (the first heat generation member 301 is disposed closer to the heat storage member 302). That is, the first heat generating member 301 is disposed to heat the heat generating member 302, and the second heat generating member 311 is disposed to heat the exhaust gas.

  According to the heat storage body 20c according to the third embodiment, the heat storage body 20c can be configured without including the first heat generation member 301 in the heat storage member 302. The heat storage body 20c according to the third embodiment has a box shape, and can be arranged without forming a dead space, for example, under the floor of the vehicle. The first heat generating member 301 may also have a flat plate shape like the second heat generating member 311, and has a linear shape arranged in parallel with the flow direction of the exhaust gas. Also good.

Fourth embodiment:
With reference to FIG. 12 and FIG. 13, the thermal storage body 20d which concerns on 4th Embodiment is demonstrated. FIG. 12 is an explanatory view schematically showing a longitudinal section of a heat storage body according to the fourth embodiment. FIG. 13 is an explanatory view schematically showing a cross section of a heat storage body according to the fourth embodiment.

  The heat storage body 20 according to the fourth embodiment includes a linear first heat generating member 301 included in a plate-shaped heat storage member 302, a plate-shaped second heat generating member 311 including a heat exchange member 313, and a heat storage. A second heat storage member 32 is provided between the member 302 and the heat exchange member 313 (or the second heat generating member 311) and disposed in contact with both.

  The heat storage body 20d according to the fourth embodiment has a box shape as shown in FIG. 13, and the surface of the second heat generating member 311 including the heat storage member 302 and the heat exchange member 313 is exhaust gas. It is arranged so as to be parallel to the flow direction.

  According to the heat storage body 20d which concerns on a 4th aspect, the effect similar to the heat storage body 20b which concerns on a 2nd aspect can be acquired by providing the 2nd heat storage member 32. FIG. Moreover, the thermal storage body 20 which concerns on 4th Embodiment can be arrange | positioned, without forming a dead space with respect to the under floor etc. of a vehicle.

Fifth embodiment:
A heat storage body 20e according to the fifth embodiment will be described with reference to FIG. FIG. 14 is an explanatory view schematically showing a longitudinal section of a heat storage body according to the fifth embodiment. In the heat storage body 20e according to the fifth embodiment, the first heater 30 is arranged on the downstream side of the second heat generating member 311 so as to be orthogonal to the flow direction of the exhaust gas, and the second heat generating member 311 differs from the heat storage body 20 according to the first embodiment in that 311 is disposed on the entire cross section of the heat storage body 20e. According to the heat storage body 20e according to the fifth embodiment, since the contact area between the second heat generating member 311 and the exhaust gas can be increased, the exhaust gas is efficiently heated by the second heat generating member 311. be able to.

  In the fifth embodiment, as shown in FIG. 15, the first heater 30 is arranged on the downstream side of the second heat generating member 311 so that the longitudinal direction thereof is parallel to the flow direction of the exhaust gas. May be. FIG. 15 is an explanatory view schematically showing a longitudinal section of a heat storage body which is a modification of the heat storage body according to the fifth embodiment. In this case, since the contact area between the second heat generating member 311 and the first heater 30 can be reduced, the second heat generating member 311 to the heat storage member 302 in the first heater 30 can be reduced. It becomes possible to suppress heat conduction, and for example, it is possible to realize efficient heating of exhaust gas at low temperature start. 14 and 15, a configuration in which the second heat generating member 311 is disposed on the downstream side of the first heater 30 may be employed. In this case, when the temperature of the first heater 30 is low (when the temperature of the heat storage member 302 itself is low, the first heat generating member 301 is not operating sufficiently), the second heat generating member 311 is used. It is possible to suppress or prevent the heat energy of the exhaust gas heated by the first heater 30 from being absorbed.

Sixth embodiment:
A heat storage body 20f according to the sixth embodiment will be described with reference to FIG. FIG. 16 is an explanatory view schematically showing a longitudinal section of a heat storage body according to the sixth embodiment. The heat storage body 20f according to the sixth embodiment is different from the heat storage body 20 according to the first embodiment in that the second heat generating member 311 is disposed over the entire length of the first heater 30. According to the heat storage body 20f according to the sixth embodiment, since the contact area between the second heat generating member 311 and the exhaust gas can be increased, the exhaust gas is efficiently heated by the second heat generating member 311. be able to.

Seventh embodiment:
A heat storage body 20g according to the seventh embodiment will be described with reference to FIG. FIG. 17 is an explanatory view schematically showing a longitudinal section of a heat storage body according to the seventh embodiment. In the heat storage body 20g according to the seventh embodiment, the second heat generating member 311 is disposed on the central axis of the heat storage body 20g, and the first heater 30 is disposed along the inner peripheral surface of the case 21. In this respect, it differs from the heat storage body 20 according to the first embodiment. According to the heat storage body 20g according to the seventh embodiment, the contact area between the first heater 30 (the first heat generating member 301 and the heat storage member 302) and the flow direction of the exhaust gas is further increased, thereby efficiently. The temperature of the exhaust gas can be raised. According to the heat storage body 20g according to the seventh embodiment, since the second heat generating member 311 is disposed in the central space of the heat storage body 20g, the flow resistance of the exhaust gas can be further reduced. Needless to say, the second heat storage member 32 may be disposed in the separation portion 312.

Variation:
(1) In the first embodiment, the temperature of the heat storage body 20 and the SCR device 14 is acquired by the temperature sensor provided in the heat storage body 20 and the temperature sensor provided in the SCR device 14. Each temperature may be obtained uniformly based on the elapsed time from the start of the engine 510 or based on the energization history of the first heat generating member 301 and the second heat generating member 311.

(2) Since the exhaust gas purification system 10 according to this embodiment includes the heat storage body 20 at the front stage of the SCR device 14, the exhaust gas having a temperature suitable for NOx purification on a regular basis with respect to the SCR device 14. As a result, the SCR device 14 can perform NOx purification even under conditions in which NOx purification could not be performed due to a decrease in exhaust gas temperature, and NOx is discharged into the atmosphere. The amount can be further reduced. In addition, the amount of fuel consumed regardless of traveling can be eliminated because the process for increasing the exhaust gas temperature due to fuel combustion, which has been conventionally performed in the DOC 12 or DPF 13 to increase the exhaust gas temperature, can be eliminated or reduced. Can be reduced.

(3) The exhaust gas purification system 10 according to the present embodiment may adopt the following configuration in addition to the above configuration. In the exhaust gas purification system 10 according to the above-described embodiment, the heat storage body 20 is disposed between the DPF 13 and the SCR device 14, but the heat storage body 20 may be disposed in front of the DPF 13. In this case, it is possible to maintain the exhaust gas temperature introduced into the DPF 13 at a high temperature, and it is expected that the regeneration process will be periodically performed spontaneously without the forced regeneration process with fuel injection. obtain. As a result, it is not necessary to consume fuel for the regeneration process, and the fuel efficiency of the vehicle can be improved.

  The purification device in the present specification is not limited to a so-called chemical reaction purification catalyst that converts a specific component (substance) in exhaust gas into a non-hazardous component (substance) by a catalyst. A filter-type purification device that collects components is also included. Even in the filter type purification apparatus, there may be an appropriate temperature range for appropriately performing the regeneration operation. If the heat storage body 20 according to this embodiment is used, the exhaust gas temperature introduced into the filter type purification apparatus can be set. The filter-type purifying device can be maintained in an appropriate temperature range, and can exhibit the expected performance under a wide range of conditions without depending on the operating condition of the engine 510. Therefore, the heat storage body 20 according to the present embodiment may be used in the previous stage of any purification device as long as the purification device exhibits performance by introducing exhaust gas in a predetermined temperature range. By being used in the previous stage of the purification device, the performance of the purification device can be exhibited under a wide range of conditions.

(4) In the above embodiment, the diesel engine 510 has been described as an example. However, the heat storage body 20 according to the present embodiment is disposed in the exhaust path of the gasoline engine, and constitutes an exhaust gas purification system for the gasoline engine. May be. The exhaust gas temperature of a gasoline engine is higher than the exhaust gas temperature of a diesel engine, but in order to achieve sufficient exhaust gas purification from the start of the engine, the catalyst temperature is set to a temperature range where the catalyst exhibits its intended performance. Various attempts have been made to raise it. For example, an early warming-up of the catalyst has been attempted by arranging a three-way catalyst, which is generally used as a purification device for a gasoline engine, immediately below the exhaust manifold. However, when the arrangement position of the catalyst is determined depending on the heat distribution of the exhaust gas temperature, the arrangement position of the catalyst has no degree of freedom, and the design around the engine has no degree of freedom. On the other hand, if the heat storage body 20 according to the present embodiment is applied, it is possible to realize early warm-up regardless of the arrangement position of the three-way catalyst, and there is an advantage that the degree of freedom in vehicle design is increased. .

(5) In the said embodiment, although the thermal storage body 20 provided with the one thermal storage member 302 is used, the thermal storage body 20 may have the some independent thermal storage member 302. FIG. In this case, the temperature distribution of the exhaust gas in the heat storage body 20 can be made uniform by diffusion and mixing of the exhaust gas temperature between the heat storage members 23.

(6) In the above embodiment, the heat storage body 20 has a straight cylindrical shape (cylindrical shape), but redundant redundantly folded multiple times from the introduction parts 211b and 212b to the discharge parts 211c and 212c. It may have a shape. Moreover, in the said embodiment, although the exhaust gas purification system 10 extended linearly is demonstrated as an example as a mounting system of the thermal storage body 20, as for the thermal storage body 20, one part structure or piping has another structure. Alternatively, it may be applied to a purification system that is arranged in a direction intersecting with the piping and formed in a folded shape. For example, it is applied to a purification system having a folded shape having a parallel part arranged parallel to the ground when mounted on the vehicle and a crossing part intersecting the parallel part, and having a reduced length in the flow direction of exhaust gas. Also good. The intersecting portion may be a vertical portion perpendicular to the ground, and may be a purification system having a bulk in the vertical direction. In this case, the heat storage body 20 may be disposed at either the parallel portion or the intersecting portion.

  As mentioned above, although this invention was demonstrated based on the Example and the modification, Embodiment mentioned above is for making an understanding of this invention easy, and does not limit this invention. The present invention can be changed and improved without departing from the spirit and scope of the claims, and equivalents thereof are included in the present invention. For example, the technical features in the embodiments and the modifications corresponding to the technical features in each embodiment described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the effects, replacement or combination can be performed as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 10 ... Purification system 11 ... Exhaust pipe 11a ... Manifold 11b ... Muffler end pipe 12 ... Diesel oxidation catalyst 13 ... Diesel particulate filter 14 ... Selective catalyst reduction device 15 ... Diesel oxidation catalyst 17 ... Fuel injection device 18 ... Urea water injection device 191 ... 1st temperature sensor 192 ... 2nd temperature sensor 20 ... Thermal storage body 20a-20g ... Thermal storage body 21 ... Case 21a ... Grounding wire 211 ... Outer case 211a ... Main-body part 211b ... Introducing part 211c ... Outlet part 212 ... Inner case 212a ... Body part 212b ... Introduction part 212c ... Discharge part 25 ... Heat insulating material 261 ... Upstream side cover 262 ... Downstream side cover 263 ... Rectifying member 30 ... First heater 301 ... First heating member 301a ... Ground side terminal 302 ... Heat storage member 303 ... Housing 31 ... Second heater 311 ... Second generator Thermal member 311a ... Ground side terminal 312 ... Separating part 313 ... Heat exchange member 32 ... Second heat storage member 40 ... Alternator 401 ... Alternator side pulley 41 ... Auxiliary machine 42 ... Battery 500 ... Vehicle 510 ... Diesel engine 511 ... Engine side pulley DESCRIPTION OF SYMBOLS 512 ... Belt 520 ... Wheel 60 ... Control unit 61 ... 1st relay 62 ... 2nd relay 63 ... 3rd relay 64 ... Ammeter

Claims (12)

A heat storage body disposed in an exhaust pipe of an internal combustion engine,
A heat storage member;
A first heating member used to store heat in the heat storage member;
Unlike the first heat generating member, wherein the first heat generating member and a second heating member for separately heating, layered with the separated portion to form an exhaust gas passage portion through which exhaust gas flows A second corrugated metal plate or a second heat generating member made of a metal corrugated plate and a flat plate ,
A heat storage body. The heat storage body according to claim 1,
The ratio of the surface area in contact with the heat storage member to the total surface area of the first heat generating member is greater than the ratio of the surface area in contact with the heat storage member to the total surface area of the second heat generating member. In the heat storage body according to claim 1 or 2 ,
The first heat generating member is a heat storage member included in the heat storage member. The heat storage body according to claim 3 further includes:
A heat storage body comprising a housing that encloses the first heat generating member and the heat storage member to form a first heater. The heat storage body according to claim 4 further includes:
A heat storage body comprising a second heat storage member disposed between the first heater and the second heat generating member. In the thermal storage body as described in any one of Claim 1 to 5 ,
A heat storage body in which one electrode of each of the first heat generating member and the second heat generating member has the same potential. The heat storage body according to any one of claims 1 to 5 ,
A housing covering the heat storage body;
A heat storage body in which one electrode of each of the first heat generating member and the second heat generating member and the casing have the same potential. In the thermal storage body as described in any one of Claim 1 to 7 ,
A heat storage body in which regenerative power generated when the vehicle is decelerated is supplied to the first heat generating member. A first heat generating member; a second heat generating member; and a heat storage member disposed between the first heat generating member and the second heat generating member. The heat generating member is disposed in an exhaust pipe of the internal combustion engine. A heat storage body control device,
A first switching unit that switches a supply destination of electric power generated when the vehicle is driven to either a battery or the first heating member;
And a control unit that switches the first switching unit to supply the generated electric power to the first heating member when the vehicle decelerates under a predetermined condition. The control device according to claim 9 further includes:
A second switching unit that electrically connects or disconnects the battery and the second heat generating member;
The control unit switches the second switching unit so as to electrically connect the battery and the second heat generating member when starting the vehicle under a predetermined condition. The control device according to claim 10 further includes:
A temperature detector is provided on the exhaust side of the heat storage body,
The first switching unit further electrically connects or disconnects the battery and the first heating member,
When the temperature detected by the temperature detector is equal to or lower than a predetermined temperature, the control unit switches the first switching unit to electrically connect the battery and the first heating member, A control device that switches the second switching unit to electrically connect the battery and the second heat generating member. A first heat generating member; a second heat generating member; and a heat storage member disposed between the first heat generating member and the second heat generating member. The heat generating member is disposed in an exhaust pipe of the internal combustion engine. A method of controlling the heat storage body,
Determine if the vehicle is decelerating,
When it is determined that the vehicle is in a decelerating state, the supply of power to the second heat generating member is stopped, and the power generated as the vehicle is decelerated is directly supplied to the first heat generating member. ,
A control method comprising:

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