JP5829909B2 - In-vehicle power generation system - Google Patents

Description

  The present invention relates to an on-vehicle power generation system, and more particularly to an on-vehicle power generation system mounted on a vehicle such as an automobile.

  Conventionally, in internal combustion engines such as automobile engines, heat exchangers such as boilers and air conditioning equipment, electric engines such as generators and motors, and various energy utilization devices such as light emitting devices such as lighting, for example, as exhaust heat, light, etc. A lot of thermal energy is released and lost.

  In recent years, from the viewpoint of energy saving, it is required to recover the released thermal energy and reuse it as an energy source. As such a method, thermoelectric conversion power generation using a pyroelectric element is known. Yes.

  Specifically, for example, a heating source that increases the temperature of each of the plurality of pyroelectric elements, a cooling source that decreases the temperature of each of the pyroelectric elements, a heating source and a cooling source, and / or a pyroelectric element A method of taking out DC power or AC power from a pyroelectric element by periodically raising and lowering the temperature of the pyroelectric element by a heating source and a cooling source using a power generation device including a moving unit that moves the element, It has been proposed (see, for example, Patent Document 1).

JP-A-11-332266

  On the other hand, as such a power generation method, a power generation device is mounted on a vehicle such as an automobile, for example, a pyroelectric element is disposed in an exhaust pipe from which exhaust gas is discharged from a multi-cycle internal combustion engine, and the internal combustion engine It can also be considered to use as a heating source and a cooling source.

  In such a case, exhaust gas generated by the combustion of fuel in the internal combustion engine is periodically supplied to the pyroelectric element, and the pyroelectric element is heated, while the supply of exhaust gas is periodically stopped. Then, the pyroelectric element is cooled to generate electric power, and the electric power is taken out through a conductor or the like.

  In such a power generation system, it is required to arrange an element in the exhaust pipe with good workability, and further, it is required to protect a conducting wire for taking out electric power.

  The objective of this invention is providing the vehicle-mounted electric power generation system which can arrange | position an element easily and can protect the device which takes out electric power.

  In order to achieve the above object, an in-vehicle power generation system according to the present invention includes an engine, an exhaust pipe for exhausting exhaust gas from the engine, and an exhaust pipe disposed in the exhaust pipe. And a second device for taking out electric power from the first device, and the exhaust pipe in a portion where the first device is disposed is extended in the direction in which the exhaust pipe extends. It is possible to divide along a direction intersecting with the heat sink, and a heat insulating material is interposed in the divided portion of the exhaust pipe so as to cover the second device.

  In such an in-vehicle power generation system, since the exhaust pipe of the part where the first device is arranged can be divided along the direction intersecting with the extending direction of the exhaust pipe, the part is divided from the exhaust pipe. Thus, the first device can be easily arranged in the exhaust pipe.

  In such an in-vehicle power generation system, since the heat insulating material is interposed so as to cover the second device in the divided portion of the exhaust pipe, the second device can be protected by the heat insulating material. Damage can be suppressed.

  According to the in-vehicle power generation system of the present invention, the first device can be easily arranged in the exhaust pipe by dividing the exhaust pipe, and the second device is prevented from being damaged in the divided portion. Can do.

It is a schematic structure figure of one embodiment of the in-vehicle power generation system of the present invention. It is a principal part enlarged view of the branch pipe in the vehicle-mounted electric power generation system described in FIG.

1. In-vehicle power generation system FIG. 1 is a schematic configuration diagram of an embodiment of an in-vehicle power generation system according to the present invention.

  In FIG. 1, an automobile 11 includes an in-vehicle power generation system 1.

  The in-vehicle power generation system 1 includes an engine 2, an exhaust pipe 5 for exhausting exhaust gas from the engine 2, a first device 3 disposed in the exhaust pipe 5, and a first device for taking out electric power from the first device 3. 2 devices 4.

  The engine 2 is a device that outputs the power of the automobile 11, and for example, a single cylinder type or a multi-cylinder type (for example, a 2-cylinder type, a 3-cylinder type, a 4-cylinder type, or a 6-cylinder type) is employed. In each cylinder, a multi-cycle method (for example, a 2-cycle method, a 4-cycle method, a 6-cycle method, etc.) is employed.

  Hereinafter, description will be made using an engine employing a four-cylinder type and a four-cycle method.

  The engine 2 includes a plurality of (not shown) cylinders (not shown), and as will be described in detail later, in each cylinder, pistons are repeatedly moved up and down to perform an intake process, a compression process, an explosion process, and an exhaust process. By being carried out sequentially, fuel is burned and power is output.

  Further, an upstream end of an exhaust pipe 5 (specifically, a branch pipe 18 (described later)) is connected to the front side of each cylinder of the engine 2 (the front side in the vehicle front-rear direction; the same applies hereinafter). That is, a front exhaust type engine that allows exhaust gas to be discharged from the front of the engine 2 to the exhaust pipe 5 is employed as the engine 2.

  The exhaust pipe 5 is an exhaust manifold (exhaust manifold) provided for converging exhaust gas discharged from each cylinder of the engine 2, and a plurality of (four) branches connected to each cylinder of the engine 2. A pipe 18 and an air collection pipe 19 that integrates the branch pipes 18 into one are provided on the downstream side of the branch pipes 18.

  The plurality (four) of branch pipes 18 are arranged in parallel along the vehicle width direction of the automobile 11 with a space therebetween. In FIG. 1A, a schematic top view in the vertical direction of the vehicle is taken out and shown. Hereinafter, when it is necessary to distinguish a plurality of (four) branch pipes 18, they are referred to as a branch pipe 18 a, a branch pipe 18 b, a branch pipe 18 c and a branch pipe 18 d in order from the upper side in the schematic top view.

  In such an exhaust pipe 5, the upstream end of the branch pipe 18 is connected to each cylinder of the engine 2, and the downstream end of the branch pipe 18 and the upstream end of the air collecting pipe 19 are connected to each other. It is connected. Further, the downstream end of the air collecting pipe 19 is connected to the upstream end of the catalyst mounting portion 12 described later.

  FIG. 2 is an enlarged view of a main part of the branch pipe in the in-vehicle power generation system shown in FIG.

  As shown in FIG. 2, a first device 3 (described later) is arranged in the branch pipe 18 (exhaust pipe 5), and a portion of the branch pipe 18 (exhaust pipe 5) where the first device 3 (described later) is arranged. ) Can be divided along a direction intersecting with the direction in which the branch pipe 18 (exhaust pipe 5) extends, preferably along a direction orthogonal thereto.

  More specifically, the branch pipe 18 is a portion where the first device 3 is arranged, and is partitioned along a substantially U-shaped boundary S1 partitioned along the circumferential direction of the branch pipe 18 and along the longitudinal direction. It is possible to divide the lid portion 6 and the accommodating portion 7 at a linear boundary S2.

  The lid 6 is substantially U-shaped in cross-section when the branch pipe 18 is divided along the direction (radial direction of the branch pipe 18) perpendicular to the extending direction over the portion where the first device 3 is disposed. It is formed as a shaped member.

  The opening width of the lid portion 6 (the length between the one side end portion and the other side end portion in a substantially U shape in cross section) is not particularly limited as long as the arrangement of the first device 3 with respect to the branch pipe 18 can be facilitated. However, when the branch pipe 18 is cylindrical, for example, it is substantially the same as its diameter.

  Such a lid portion 6 includes a lid-side flange 16. The lid-side flange 16 is a flat plate member that extends along the direction in which the branch pipe 18 extends. At the both ends of the opening of the lid portion 6 (one side end portion and the other side end portion that are substantially U-shaped in cross section), the lid portion 6 is provided so as to protrude from the outer peripheral surface of 6 along the radial direction of the branch pipe 18.

  The accommodating portion 7 is a remaining portion of the lid portion 6 divided as described above in a portion where the first device 3 of the branch pipe 18 is disposed, and is partitioned as a substantially U-shaped region in sectional view.

  The opening width of the accommodating portion 7 (the length between one end portion and the other end portion in a substantially U shape in cross section) is not particularly limited as long as the arrangement of the first device 3 with respect to the branch pipe 18 can be facilitated. However, when the branch pipe 18 is cylindrical, for example, it is substantially the same as its diameter.

  Such a housing portion 7 includes a housing-side flange 17. The housing-side flange 17 is a flat plate member extending along the direction in which the branch pipe 18 extends, and at the both ends of the opening of the housing portion 7 (one side end portion and the other side end portion having a substantially U shape in cross section). 7 is provided so as to protrude from the outer peripheral surface of 7 along the radial direction of the branch pipe 18.

  The lid-side flange 16 and the housing-side flange 17 are formed with a plurality of through holes 20 penetrating in the thickness direction at intervals along the longitudinal direction. Thereby, fixing members, such as a volt | bolt, can be inserted in the through-hole 20, and the cover part 6 and the accommodating part 7 can be fastened with a fixing member.

  According to such an in-vehicle power generation system 1, as will be described in detail later, the branch pipe 18 (exhaust pipe 5) where the first device 3 (described later) is disposed extends from the branch pipe 18 (exhaust pipe 5). The first device 3 (described later) can be separated from the branch pipe 18 (exhaust pipe 5) by dividing the portion from the branch pipe 18 (exhaust pipe 5). Can be easily arranged.

  Further, in such an in-vehicle power generation system 1, the second device 4 described later is easily taken out of the branch pipe 18 from between the lid portion 6 and the accommodating portion 7 as indicated by a virtual line in FIG. 2. be able to.

  Further, in a state where the lid portion 6 and the accommodating portion 7 are fastened, the heat insulating material 22 is connected to the divided portion of the exhaust pipe 5 (the above-described boundary S1 and the above-described boundary S2) of the second device 4. 23 (described later) is interposed.

  Although it does not restrict | limit especially as the heat insulating material 22, Glass wool, ceramics, etc. are mentioned.

  If the heat insulating material 22 is interposed so as to cover the conducting wire 23 (described later) of the second device 4, the conducting wire 23 (described later) of the second device 4 can be protected by the insulating material 22, and the second device It is possible to suppress damage to the four conductive wires 23 (described later).

  Such a heat insulating material 22 is also used as a sealing member, and the heat insulating material 22 seals the joint portion between the lid portion 6 and the accommodating portion 7.

  The first device 3 is a device that undergoes electrical polarization as the temperature increases and decreases with time as the exhaust gas is exhausted.

  The electric polarization referred to here is a phenomenon in which a potential difference occurs due to dielectric polarization due to displacement of positive and negative ions due to crystal distortion, such as a piezo effect and / or a phenomenon in which a dielectric constant changes due to a temperature change and a potential difference occurs, such as pyroelectricity. It is defined as a phenomenon in which an electromotive force is generated in a material, such as an effect.

  More specifically, examples of the first device 3 include a device that is electrically polarized by a piezo effect, a device that is electrically polarized by a pyroelectric effect, and the like.

  The piezo effect is an effect (phenomenon) in which when a stress or strain is applied, it is electrically polarized according to the magnitude of the stress or strain.

  The first device 3 that is electrically polarized by the piezo effect is not particularly limited, and a known piezo element (piezoelectric element) can be used.

  When a piezo element is used as the first device 3, the piezo element is, for example, in contact with (exposed to) exhaust gas in a state where its periphery is fixed by a fixing member and volume expansion is suppressed. It is arranged in the branch pipe 18.

  The fixing member is not particularly limited, and for example, a second device 4 (for example, an electrode) described later can be used.

  In such a case, the piezo element expands or contracts by being heated or cooled periodically.

  At this time, since the volume expansion of the piezo element is suppressed by the fixing member, the piezo element is pressed by the fixing member and is electrically polarized by the piezo effect (piezoelectric effect) or phase transformation near the Curie point. . Thereby, as will be described in detail later, power is extracted from the piezo element via the second device 4.

  In addition, such a piezo element is normally maintained in a heated state or a cooled state, and when its temperature becomes constant (that is, a constant volume), the electric polarization is neutralized, and then cooled or heated, Again, it is electrically polarized.

  Therefore, when the piezo element is periodically heated and cooled, the electric polarization of the piezo element and its neutralization are repeated periodically.

  As a result, electric power is extracted as a waveform (for example, alternating current, pulsating flow, etc.) that fluctuates periodically by the second device 4 described later.

  The pyroelectric effect is, for example, an effect (phenomenon) in which the insulator is electrically polarized in accordance with a change in temperature when the insulator (dielectric) is heated and cooled, and includes the first effect and the second effect. It is out.

  The first effect is an effect in which, when the insulator is heated and cooled, it spontaneously polarizes due to the temperature change and generates a charge on the surface of the insulator.

  In addition, the second effect is an effect that pressure deformation occurs in the crystal structure due to temperature changes during heating and cooling of the insulator, and piezoelectric polarization occurs due to stress or strain applied to the crystal structure (piezo effect, piezoelectric effect). ).

  The device that is electrically polarized by such a pyroelectric effect is not particularly limited, and a known pyroelectric element can be used.

  When a pyroelectric element is used as the first device 3, the pyroelectric element is disposed in the branch pipe 18 so as to be in contact (exposed) with the exhaust gas.

  In such a case, the pyroelectric element is electrically polarized by the pyroelectric effect (including the first effect and the second effect) by being heated or cooled periodically. Thereby, although mentioned later in detail, electric power is taken out from the pyroelectric element via the second device 4.

  Also, such pyroelectric elements are usually maintained in a heated state or a cooled state, and when the temperature becomes constant, the electric polarization is neutralized, and then cooled or heated again to be electrically polarized again. .

  Therefore, when the pyroelectric element is periodically heated and cooled, the electric polarization of the pyroelectric element and its neutralization are repeated periodically.

  As a result, electric power is extracted as a waveform (for example, alternating current, pulsating flow, etc.) that fluctuates periodically by the second device 4 described later.

Specifically, as described above, the first device 3 is a known pyroelectric element (for example, BaTiO ₃ , CaTiO ₃ , (CaBi) TiO ₃ , BaNd ₂ Ti ₅ O ₁₄ , BaSm ₂ Ti _4. O ₁₂ , lead zirconate titanate (PZT: Pb (Zr, Ti) O ₃ ), etc., known piezo elements (eg, quartz (SiO ₂ ), zinc oxide (ZnO), Rochelle salt (potassium sodium tartrate) _{(KNaC 4 H 4 O 6)} , lead zirconate titanate (PZT: Pb (Zr, Ti ) O 3), lithium niobate (LiNbO _3), lithium tantalate (LiTaO _3), lithium tetraborate _(Li 2 B ₄ O ₇ ), Langasite (La ₃ Ga ₅ SiO ₁₄ ), Aluminum Nitride (AlN), Tourmaline, Poly Vinylidene fluoride (PVDF) or the like can be used.

  These first devices 3 can be used alone or in combination of two or more.

  The Curie point of the first device 3 is, for example, −77 ° C. or higher, preferably −10 ° C. or higher, for example, 1300 ° C. or lower, preferably 900 ° C. or lower.

  The relative dielectric constant of the first device 3 (insulator (dielectric)) is, for example, 1 or more, preferably 100 or more, more preferably 2000 or more.

  In such an in-vehicle power generation system 1, the higher the relative permittivity of the first device 3 (insulator (dielectric material)), the higher the energy conversion efficiency and the higher voltage the electric power can be extracted. If the relative dielectric constant is less than the lower limit, the energy conversion efficiency may be low, and the voltage of the obtained power may be low.

  The first device 3 (insulator (dielectric)) is electrically polarized by the temperature change of the exhaust gas. The electrical polarization may be any of electronic polarization, ion polarization, and orientation polarization.

  For example, it is expected that a material that exhibits polarization by orientation polarization (for example, a liquid crystal material) can improve power generation efficiency by changing its molecular structure.

  As described above, the first device 3 is fixed in the branch pipe 18 (exhaust pipe 5) by the second device 4 (and a fixing member (not shown) provided if necessary). Thus, the first device 3 can be contacted (exposed) to the exhaust gas through the second device 4 in the branch pipe 18.

  The second device 4 is provided to extract power from the first device 3.

  Such a second device 4 includes, for example, two electrodes (for example, a copper electrode, a silver electrode, and the like) disposed opposite to each other with the first device 3 interposed therebetween, and a conductive wire 23 connected to these electrodes. And is electrically connected to the first device 3.

  Such a second device 4 is preferably covered with a shock absorber 21.

  Specifically, as shown in FIGS. 1B and 2, in the in-vehicle power generation system 1, the first device 3 described above is separated from the inner peripheral surface of the branch pipe 18 (exhaust pipe 5) by a predetermined interval. The shock absorber 21 is interposed between the first device 3 and the inner peripheral surface of the branch pipe 18 (exhaust pipe 5) so as to cover the second device 4. In addition, in FIG.1 (b), sectional drawing along the radial direction of the branch pipe 18 is expanded and shown.

  The shock absorbing material 21 is a shock absorbing material having shock absorbing properties, and examples thereof include a heat conductive cushion material such as metal wool.

  And the 2nd device 4 is penetrated by such an impact-absorbing material 21, passes through the impact-absorbing material 21, and can be taken out of the branch pipe 18 from between the cover part 6 and the accommodating part 7. It is said that.

  In such an in-vehicle power generation system 1, the second device 4 is covered with the shock absorber 21 between the first device 3 and the inner peripheral surface of the branch pipe 18 (exhaust pipe 5). Can be protected by the shock absorbing material 21, and the second device 4 can be prevented from being damaged by being exposed to exhaust gas.

  Further, as shown in FIG. 1, the second device 4 is sequentially electrically connected to a booster 8, an AC / DC converter (AC-DC converter) 9, and a battery 10.

  In addition to the on-vehicle power generation system 1, the automobile 11 includes a catalyst mounting portion 12, an exhaust pipe 13, a muffler 14, and a discharge pipe 15.

The catalyst mounting unit 12 includes, for example, a catalyst carrier and a catalyst coated on the carrier, and includes hydrocarbons (HC), nitrogen oxides (NO _x ), one contained in exhaust gas discharged from the engine 2, and the like. In order to purify harmful components such as carbon oxide (CO), the downstream end of the engine 2 is connected. Specifically, the first device 3 is connected to the downstream end of the air collecting tube 19 in the vicinity of the downstream side.

  The exhaust pipe 13 is provided to guide the exhaust gas purified in the catalyst mounting portion 12 to the muffler 14. The upstream end is connected to the catalyst mounting portion 12 and the downstream end is the muffler 14. It is connected to the.

  The muffler 14 is provided to silence noise generated in the engine 2 (especially, an explosion process described later), and its upstream end is connected to the downstream end of the exhaust pipe 13. The downstream end of the muffler 14 is connected to the upstream end of the discharge pipe 15.

The exhaust pipe 15 is provided to discharge exhaust gas that has been exhausted from the engine 2, sequentially passes through the exhaust pipe 5, the catalyst mounting portion 12, the exhaust pipe 13, and the muffler 14, and has been purified and silenced. The upstream end is connected to the downstream end of the muffler 14, and the downstream end is open to the outside air.
2. Power Generation Method Hereinafter, a power generation method using the above-described on-vehicle power generation system 1 will be described in detail.

  In such an in-vehicle power generation system 1, when the automobile 11 is manufactured, the branch pipe 18 is divided into the lid portion 6 and the accommodating portion 7 as shown in FIG. 2, and the first device 3 and the second device 4 are The shock absorber 21 is disposed in the container 7 together with the shock absorber 21.

  At this time, the second device 4 is disposed so as to pass through the shock absorber 21 and be covered with the shock absorber 21.

  Then, after the first device 3 and the second device 4 are arranged, the lead wire 23 of the second device 4 is taken out from between the lid portion 6 and the accommodating portion 7 and is covered with the heat insulating material 22. And the accommodating portion 7 are fastened by a fixing member such as a bolt. Thereby, the first device 3 is arranged in the branch pipe 18.

  In such an in-vehicle power generation system 1, the engine 2 is driven when the automobile 11 is traveling, and the pistons are repeatedly moved up and down in each cylinder, and the intake process, the compression process, the explosion process, and the exhaust process are sequentially performed. At the same time, high-temperature exhaust gas is supplied to the first device 3 in the exhaust process.

  More specifically, for example, in two cylinders, that is, a cylinder connected to the branch pipe 18a and a cylinder connected to the branch pipe 18c, the pistons are interlocked to perform the intake process, the compression process, the explosion process, and the exhaust process. , Implemented in phase. As a result, the fuel is burned and power is output, and in the exhaust process, high-temperature exhaust gas is supplied to the branch pipe 18a and the branch pipe 18c and passes through the inside thereof. On the other hand, in processes other than the exhaust process (intake process, compression process, explosion process), the supply of exhaust gas is stopped.

  At this time, the heat of the engine 2 is transmitted through the exhaust gas (heat medium), the internal temperatures of the branch pipe 18a and the branch pipe 18c rise in the exhaust process, and other processes (intake process, compression process, explosion) In step). Therefore, the internal temperature of the branch pipe 18a and the branch pipe 18c and the temperature of the first device 3 in the branch pipe 18 rise and fall over time according to the piston cycle, and the high temperature state and the low temperature state are periodically changed. Repeated.

  In addition, the timing of the two cylinders is different from each other, and in two cylinders, that is, a cylinder connected to the branch pipe 18b and a cylinder connected to the branch pipe 18d, the pistons are interlocked, and an intake process, a compression process, The explosion process and the exhaust process are performed in the same phase. As a result, the fuel is burned, power is output, and high-temperature exhaust gas is supplied to the branch pipe 18b and the branch pipe 18d in an exhaust process performed at a timing different from that of the branch pipe 18a and the branch pipe 18c. Pass through its interior. On the other hand, in processes other than the exhaust process (intake process, compression process, explosion process), the supply of exhaust gas is stopped.

  At this time, the heat of the engine 2 is transmitted through the exhaust gas (heat medium), the internal temperatures of the branch pipe 18b and the branch pipe 18d rise in the exhaust process, and other processes (intake process, compression process, explosion) In step). Therefore, the internal temperature of the branch pipe 18b and the branch pipe 18d and the temperature of the first device 3 in the branch pipe 18 rise and fall over time according to the piston cycle, and the high temperature state and the low temperature state are periodically changed. Repeated. The periodic supply and stop of the exhaust gas has the same period but a different phase from the periodic supply and stop of the exhaust gas of the branch pipe 18a and the branch pipe 18c.

  That is, in the in-vehicle power generation system 1, as described above, since the first device 3 is arranged inside each branch pipe 18, the exhaust gas is periodically discharged from the engine 2 in the exhaust process and branched. By being periodically supplied to the first device 3 in the pipe 18, the first device 3 is periodically heated to be in a high temperature state. Further, in processes other than the exhaust process (intake process, compression process, explosion process), the supply of exhaust gas is periodically stopped, so that the first device 3 is periodically cooled to a low temperature state. The

  In this manner, by periodically setting the first device 3 to a high temperature state or a low temperature state, the first device 3 is made to have an effect (for example, a piezo effect) according to its element (for example, a piezo element, a pyroelectric element, or the like). , The pyroelectric effect, etc.) can be periodically electrically polarized.

  In such an in-vehicle power generation system 1, the temperature of the first device 3 is, for example, 200 to 1200 ° C., preferably 700 to 900 ° C. in the high temperature state, and the temperature in the low temperature state is the above high temperature state. More specifically, for example, 100 to 800 ° C., preferably 200 to 500 ° C., and the temperature difference between the high temperature state and the low temperature state is, for example, 10 to 600 ° C., preferably 20 to 20 ° C. 500 ° C.

  Moreover, the repetition period of these high temperature states and low temperature states is, for example, 10 to 400 cycles / second, preferably 30 to 100 cycles / second.

  In this way, by periodically raising and lowering the temperature of the first device 3, the first device 3 can be periodically electrically polarized, and the waveform in which the power periodically fluctuates via the second device 4. (For example, alternating current, pulsating flow, etc.) can be taken out.

  Note that the electric power obtained as described above is boosted in a state of a waveform (for example, alternating current, pulsating current) that fluctuates periodically in a booster 8 connected to the second device 4 if necessary, and then boosted. The generated power is converted into a DC voltage by the AC / DC converter 9 and then stored in the battery 10. The electric power stored in the battery 10 can be appropriately used as the power of the automobile 11 and various electric components mounted on the automobile 11.

  Further, the exhaust gas discharged from the in-vehicle power generation system 1 passes through each branch pipe 18 and is then supplied to the air collecting pipe 19. After being collected, the exhaust gas is supplied to the catalyst mounting section 12, and the catalyst mounting section 12. The catalyst is purified by the catalyst. Thereafter, the exhaust gas is supplied to the exhaust pipe 13, silenced in the muffler 14, and then discharged to the outside air through the discharge pipe 15.

  In such an in-vehicle power generation system 1, as described above, the branch pipe 18 (exhaust pipe 5) where the first device 3 is disposed intersects the extending direction of the branch pipe 18 (exhaust pipe 5). Since it can be divided along the direction, it is possible to easily arrange the first device 3 in the branch pipe 18 (exhaust pipe 5) by dividing the portion from the branch pipe 18 (exhaust pipe 5). it can.

  Specifically, according to such an in-vehicle power generation system 1, it is possible to improve workability at the time of assembly of the first device 3 in the manufacture and subsequent maintenance of the first device 3.

  Further, in such an in-vehicle power generation system 1, since the heat insulating material 22 is interposed so as to cover the conductive wire 23 of the second device 4 in the divided portion of the exhaust pipe 5, the conductive wire 23 of the second device 4 is thermally insulated. It can protect with the material 22, and can suppress the damage of the conducting wire 23 of the 2nd device 4. FIG.

  In the above description, a front exhaust type engine is used as the engine 2, but the engine 2 is not limited to this, and although not shown in detail, for example, exhaust is provided on the rear side of each cylinder of the engine 2. A rear exhaust type engine to which the upstream end of the pipe 5 (specifically, the branch pipe 18) is connected can also be used.

  Further, in the above description, the branch pipe 18 can be divided into the lid portion 6 and the accommodating portion 7 along the direction orthogonal to the extending direction. However, the dividing direction of the lid portion 6 and the accommodating portion 7 is as follows. The crossing angle is not particularly limited as long as it is along the direction intersecting with the direction in which the branch pipe 18 extends, and the crossing angle can be appropriately set according to the purpose and application.

DESCRIPTION OF SYMBOLS 1 In-vehicle power generation system 2 Engine 3 1st device 4 2nd device 5 Exhaust pipe 22 Heat insulating material

Claims (1)

Engine,
An exhaust pipe for exhausting exhaust gas from the engine;
A first device disposed in the exhaust pipe, the temperature of which rises and falls over time as the exhaust gas is exhausted, and is electrically polarized;
A second device for extracting power from the first device;
The exhaust pipe of the portion where the first device is arranged can be divided along a direction intersecting with the extending direction of the exhaust pipe,
An in-vehicle power generation system, wherein a heat insulating material is interposed so as to cover the second device in a divided portion of the exhaust pipe.

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