JP2005180396A - Energy recovery device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an energy recovery device of an internal combustion engine, capable of improving utilization efficiency of energy obtained by recovering surplus energy of the internal combustion engine. <P>SOLUTION: This energy recovery device 20 for recovering the surplus energy of the internal combustion engine 1, has a heat accumulator 25 for generating a sound wave by using energy of exhaust gas of the internal combustion engine 1, heat exchangers 26 and 27, a transducer 24 for converting energy of the sound wave into electric energy, a cold accumulator 250 for converting the energy of the sound wave into heat energy, heat exchangers 260 and 270, and an ECU 40. The ECU 40 changes a rate of a power generation quantity by the transducer 24 and a cold quantity obtained by the heat exchanger 270 in response to a request for the energy recovery device 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an energy recovery device for recovering surplus energy of an internal combustion engine.

  Conventionally, a refrigerator utilizing a thermoacoustic phenomenon has been proposed (see, for example, Patent Document 1). This refrigerator includes a pipe filled with gas, a stack disposed inside the pipe and sandwiched between a high temperature side heat exchanger and a low temperature side heat exchanger, and a high temperature side at a position asymmetric with the stack. And a regenerator arranged together with the heat exchanger and the low temperature side heat exchanger. This refrigerator generates a self-excited vibration of gas in the stack by forming a temperature gradient between both ends of the stack, and stores it in the regenerator by propagation of standing waves and traveling waves obtained thereby. It is.

  Conventionally, an apparatus for recovering exhaust heat of an internal combustion engine using a thermoacoustic phenomenon has been proposed (see, for example, Patent Document 2). This device includes a resonance pipe connected to an exhaust gas purification catalytic converter of an internal combustion engine, a stack provided at one end of the resonance pipe, and a transducer provided at the other end of the resonance pipe. In this apparatus, one end of the stack is heated by heat generated from the catalytic converter, and a temperature gradient is applied between both ends of the stack. Thereby, sound waves are generated in the stack, and the energy of the sound waves is converted into electric energy by the transducer.

Japanese Patent No. 3015786 JP 2002-122020 A

  As described above, by using the thermoacoustic phenomenon, it is possible to recover surplus energy of the internal combustion engine and obtain electric energy and thermal energy. However, even if the surplus energy of the internal combustion engine is recovered by the thermoacoustic device, if the utilization efficiency of the energy obtained by recovering the surplus energy is poor, the meaning of using the thermoacoustic device may be lost.

  Accordingly, an object of the present invention is to provide an energy recovery device for an internal combustion engine that can improve the utilization efficiency of energy obtained by recovering excess energy of the internal combustion engine.

  An energy recovery device for an internal combustion engine according to the present invention is an energy recovery device that recovers surplus energy of the internal combustion engine, and includes an acoustic energy generation unit that generates sound waves using the surplus energy of the internal combustion engine, and an acoustic energy generation unit. By first energy converting means for converting the energy of the emitted sound wave into electrical energy, second energy converting means for converting the energy of the sound wave generated by the acoustic energy generating means into thermal energy, and the first energy converting means. Control means for changing the ratio of the energy recovery amount and the energy recovery amount by the second energy conversion means as required is provided.

  This energy recovery device can generate sound waves using surplus energy of an internal combustion engine and convert the energy of the sound waves into electric energy and heat energy. In this energy recovery device, the ratio of the energy recovery amount (electric energy) by the first energy conversion means and the energy recovery amount (thermal energy) by the second energy conversion means is changed as required. Therefore, according to this energy recovery device, when the electrical energy is required, the energy recovery amount (electric energy) by the first energy conversion means is increased, while when the heat energy is required, the second energy recovery unit increases the energy recovery amount (electric energy). Since the energy recovery amount (heat energy) by the energy conversion means can be increased, it is possible to improve the utilization efficiency of the energy obtained by recovering the surplus energy of the internal combustion engine.

  In this case, the energy recovery apparatus according to the present invention further includes a request determination unit that determines a power request amount for the first energy conversion unit and a heat request amount for the second energy conversion unit, and the control unit includes the request determination unit. It is preferable to change the ratio of the energy recovery amount by the first energy conversion means and the energy recovery amount by the second energy conversion means according to the determination result of the means.

  In addition, when the control unit changes the energy recovery amount by the first energy conversion unit, the ratio of the energy recovery amount by the first energy conversion unit and the energy recovery amount by the second energy conversion unit is changed. preferable.

  In general, the amount of energy conversion (energy recovery) is greater when sound energy is converted into electrical energy using sound / electrical conversion means than when sound wave energy is converted into heat energy using a thermoacoustic phenomenon. Amount) can be easily and accurately executed. Therefore, according to this configuration, it is possible to accurately set the ratio of the energy recovery amount by the first energy conversion means and the energy recovery amount by the second energy conversion means as required.

  Further, it is preferable that the first energy converting means includes a vibrating member that receives a sound wave and vibrates, and a means for matching the frequency of the vibrating member with the frequency of the sound wave emitted by the acoustic energy generating means. Thereby, it becomes possible to obtain electrical energy efficiently without attenuating the sound wave emitted by the acoustic energy generating means.

  The energy recovery device according to the present invention further includes an air column tube filled with a predetermined working fluid, and the acoustic energy generating means includes a high-temperature heat exchanger using the exhaust gas of the internal combustion engine as a heat source, and a low-temperature heat exchanger. And heat storage means disposed inside the air column tube so as to be located between these heat exchangers. Thereby, it is possible to efficiently recover the exhaust heat of the internal combustion engine and obtain electric energy and heat energy.

  Furthermore, the energy recovery apparatus according to the present invention further includes an air column tube filled with a predetermined working fluid, and the acoustic energy generating means transmits the pulsation of the intake air or exhaust gas of the internal combustion engine to the working fluid in the air column tube. It is preferable to generate sound waves. As a result, it is possible to efficiently recover the pulsation energy of the intake air and exhaust gas of the internal combustion engine, which should be suppressed as much as possible, and obtain electric energy and thermal energy.

  The first energy conversion means is preferably a direct-acting generator, and the second energy conversion means is disposed between the high-temperature heat exchanger, the low-temperature heat exchanger, and these heat exchangers. The heat storage means is preferably included.

  Another energy recovery device for an internal combustion engine according to the present invention is an energy recovery device for recovering surplus energy of the internal combustion engine. The energy recovery device generates acoustic waves using the surplus energy, and is generated by the acoustic energy generation device. Energy conversion means for converting the energy of the generated sound wave into electrical energy, the energy conversion means receiving a sound wave and vibrating, and the frequency of the vibration member generated by the acoustic energy generation means. And means for matching.

  This energy recovery device is capable of generating sound waves using surplus energy of an internal combustion engine and then converting the energy of the sound waves into electrical energy. In this energy recovery device, the energy converting means for converting the sound wave energy into the electric energy matches the frequency of the vibrating member that receives the sound wave and vibrates with the frequency of the sound wave emitted by the acoustic energy generating means. Have means. Therefore, according to this energy recovery device, it is possible to efficiently obtain electric energy without attenuating the sound wave generated by the acoustic energy generating means. Therefore, the efficiency of using the energy obtained by recovering the surplus energy of the internal combustion engine Can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the implementation | achievement of the energy recovery apparatus of the internal combustion engine which can improve the utilization efficiency of the energy obtained by collect | recovering the surplus energy of an internal combustion engine is attained.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing an embodiment of an energy recovery device for an internal combustion engine according to the present invention. As shown in the figure, the energy recovery device 20 is applied to, for example, an internal combustion engine 1 used as a traveling drive source of a vehicle. First, the internal combustion engine 1 to which the energy recovery device 20 is applied will be briefly described. The internal combustion engine 1 burns a mixture of fuel and air inside a combustion chamber 3 formed in the cylinder block 2 and burns it. The piston 4 is reciprocated in the chamber 3 to generate power.

  The intake port of the combustion chamber 3 is connected to the intake manifold 5, and the exhaust port of the combustion chamber 3 is connected to the exhaust manifold 6. In addition, an intake valve Vi that opens and closes an intake port, an exhaust valve Ve that opens and closes an exhaust port, a spark plug 7, and an injector 8 are disposed for each combustion chamber 3 in the cylinder head of the internal combustion engine 1. The intake manifold 5 is connected to a surge tank 9, and an air supply pipe L <b> 1 is connected to the surge tank 9. The air supply pipe L1 is connected to an air intake port (not shown) via the air cleaner 10. Further, a throttle valve 11 is incorporated in the middle of the supply pipe L1 (between the surge tank 9 and the air cleaner 10). On the other hand, the exhaust manifold 6 is connected to an exhaust pipe L2, and a catalyst device (not shown) is incorporated in the exhaust pipe L2.

  The energy recovery device 20 of the present invention is used to recover the exhaust heat of the internal combustion engine 1 as described above. The energy recovery device 20 has an air column tube 21 formed of stainless steel or the like so as to have a circular cross section, and inside the air column tube 21 is an operation such as nitrogen, helium, argon, a mixed gas of helium and argon. A fluid (inert gas) is enclosed. As shown in FIG. 1, the air column tube 21 includes a loop portion 22 formed in a substantially rectangular loop shape and a resonance portion 23 connected to one corner portion of the loop portion 22. The resonance part 23 includes a tube part 23a having a circular cross section approximately the same diameter as the loop part 22, and a closed end part 23b connected to the tip of the tube part 23a, and functions as a resonator. The diameter of the closed end portion 23b is gradually increased from the distal end of the tube portion 23a toward the closed end.

  A transducer (sound / electrical conversion unit) 24 as a first energy conversion unit that converts sound wave energy (acoustic energy) into electrical energy is disposed at the closed end of the resonance unit 23. The transducer 24 is connected to a power generation amount controller 240, and the power generation amount of the transducer 24 is set by the power generation amount controller 240. As shown in FIG. 1, the electrical energy obtained from the transducer 24 is sent to a power storage unit BU such as a battery or a capacitor via a power generation amount controller 240 and used to charge the power storage unit BU.

  In the present embodiment, as the transducer 24, a wave receiving member (vibrating member) 241 that receives sound waves, a magnet 242 fixed to the wave receiving member 241, and a magnet 242 are disposed around and connected to the power generation amount controller 240. A direct-acting generator that includes the variable inductance coil 243 and a spring device 244 that supports the magnet 242 and is fixed to the inner surface of the closed end of the resonance portion 23 is employed. As the spring device 244, an air cylinder (fluid pressure cylinder) connected to a fluid source (not shown) through an on-off valve 245 is employed. Thus, by controlling the on-off valve 245, the spring constant of the spring device 244 that elastically supports the wave receiving member 241 and the magnet 242 can be changed. Further, the inductance of the coil 243 is changed by the power generation amount controller 240 under a command from the ECU 40.

  A heat accumulator (heat storage means) 25 is disposed inside the loop portion 22 of the air column tube 21. The heat accumulator 25 has a plurality of narrow flow paths extending in parallel with the axial direction of the air column tube 21 at the arrangement location. As the heat accumulator 25, a honeycomb structure made of ceramic or the like, a thin mesh made of stainless steel or the like arranged at a minute interval, a nonwoven fabric in which metal fibers such as stainless steel are gathered, or the like can be used. A high temperature heat exchanger 26 is disposed adjacent to one end side of the heat accumulator 25, and a low temperature heat exchanger 27 is disposed adjacent to the other end side of the heat accumulator 25. That is, the heat accumulator 25 is arranged in a state of being sandwiched between the high temperature heat exchanger 26 and the low temperature heat exchanger 27.

  Exhaust gas flowing through the exhaust pipe L2 of the internal combustion engine 1 is supplied to the heat transfer tubes constituting the high temperature heat exchanger 26, and the high temperature heat exchanger 26 uses the exhaust gas of the internal combustion engine 1 as a heat source. The heat transfer tubes constituting the low-temperature heat exchanger 27 are incorporated in the cooling system L3 of the internal combustion engine 1, and the low-temperature heat exchanger 27 uses the cooling water flowing through the cooling system L3 as a heat source (cold heat source). . In the present embodiment, an exhaust gas supply adjustment valve 15 is provided at the exhaust gas inlet of the high temperature heat exchanger (its heat transfer tube) 26, and the exhaust gas supply adjustment valve 15 is closed to thereby prevent the high temperature heat exchanger 26. The supply of exhaust gas can be stopped. Similarly, the cooling system L3 includes an on-off valve 14. By closing the on-off valve 14, the supply of cooling water to the low-temperature heat exchanger (its heat transfer tube) 27 can be stopped.

  Furthermore, the regenerator 250, the cold storage high temperature heat exchanger 260, and the cold storage low temperature heat exchanger 270 are arranged in the loop portion 22 of the air column tube 21. In this case, the cold storage high-temperature heat exchanger 260 is configured so that one end of the cold storage 250 can be maintained at approximately room temperature (20 to 25 ° C.). The cold storage heat exchanger 270 is disposed adjacent to the low temperature heat exchanger 27 described above, and a predetermined refrigerant is circulated and supplied to the cold storage heat exchanger 270 (its heat transfer tube). Further, the cold storage low-temperature heat exchanger 270 is provided with a temperature sensor T that detects the temperature of the refrigerant flowing out of the heat transfer tube. In the present embodiment, the units of the regenerator 250, the high-temperature heat exchanger 260 for cold storage, and the low-temperature heat exchanger 270 for cold storage function as second energy conversion means for converting sound wave energy (acoustic energy) into heat energy. The low temperature heat exchanger 270 for cold storage is used as a cold heat source for the air conditioning unit AC.

  The energy recovery device 20 is controlled by an electronic control unit (hereinafter referred to as “ECU”) 40 that functions as control means of the internal combustion engine 1. The ECU 40 includes a CPU, a ROM, a RAM, an input / output port, a storage device, etc., all not shown. The above-described on-off valve 14 of the cooling system L3, the exhaust supply adjustment valve 15 provided at the exhaust gas inlet of the high-temperature heat exchanger 26, the spring device 244 (on-off valve 245) of the transducer 24, the power generation amount controller 240, the air conditioning unit AC Are connected to the input / output ports of the ECU 40, and these are controlled by the ECU 40.

  Further, a temperature sensor T that detects the temperature of the refrigerant flowing out of the cold storage low-temperature heat exchanger 270 and a fuel gauge RS that detects the remaining amount of electricity stored in the electricity storage unit BU are connected to the input / output port of the ECU 40. Yes. Further, a pressure sensor 28 is installed in the air column tube 21 of the energy recovery device 20, and this pressure sensor 28 is also connected to the ECU 40. The pressure sensor 28 detects the pressure of the working fluid in the air column tube 21 and gives a signal indicating the detected value to the ECU 40.

  The energy recovery device 20 configured as described above starts operating when the internal combustion engine 1 is operated and the exhaust gas from the combustion chamber 3 passes through the high temperature heat exchanger 26 of the energy recovery device 20. In this case, the temperature of the exhaust gas of the internal combustion engine 1 reaches about 900 ° C. at the maximum, so that one end of the heat accumulator 25 is heated by the exhaust gas flowing through the high-temperature heat exchanger 26 to rise in temperature. . On the other hand, the low temperature heat exchanger 27 of the energy recovery device 20 is supplied with cooling water (approximately 80 to 100 ° C.) flowing through the cooling system L3, so that the other end of the heat accumulator 25 has a low temperature heat. Cooled by the cooling water flowing through the exchanger 27. As a result, a large temperature gradient is formed between both ends of the heat accumulator 25, and as a result, thermoacoustic self-excited vibration (sound wave) of the working fluid is generated. That is, the heat accumulator 25, the high temperature heat exchanger 26, and the low temperature heat exchanger 27 function as acoustic energy generating means for generating sound waves using the energy of the exhaust gas of the internal combustion engine 1.

  When the frequency of the self-excited vibration (sound wave) of the working fluid generated in this way matches the frequency in the resonance part 23, a standing wave is formed in the resonance part 23. Further, a traveling wave traveling from the low temperature heat exchanger 27 to the high temperature heat exchanger 26 is formed in the loop portion 22. And the wave receiving member 241 of the transducer 24 arrange | positioned at the closed end part 23b is vibrated by the standing wave formed in the resonance part 23. FIG. As a result, the magnet 242 attached to the wave receiving member 241 vibrates inside the coil 243 and an induced voltage is generated at both ends of the coil 243, so that the energy (acoustic energy) of the standing wave in the resonance portion 23 is electrically It will be converted into energy. The obtained electrical energy is supplied to the power storage unit BU via the power generation amount controller 240. As a result, according to the energy recovery device 20 of the present invention, it is possible to efficiently recover the exhaust heat of the internal combustion engine 1 and obtain electric power for charging the power storage unit BU.

  Further, during operation of the internal combustion engine 1, a traveling wave generated due to a temperature gradient formed between both ends of the heat accumulator 25 causes a cold storage between the both ends of the regenerator 250 of the loop portion 22. A temperature gradient is formed so that the high temperature heat exchanger 260 side becomes high temperature and the cold storage low temperature heat exchanger 270 side becomes low temperature. At this time, one end of the regenerator 250 is maintained at a substantially normal temperature (20 to 25 ° C.) by the regenerative high-temperature heat exchanger 260, so the other end of the regenerator 250 and the regenerative low-temperature heat exchanger 270 ( The heat transfer tube) drops in accordance with the temperature gradient. Therefore, it is possible to take out the cold heat for the air conditioning unit AC through the refrigerant flowing out of the cold storage heat exchanger 270.

  As described above, according to the energy recovery device 20, self-excitation of the working fluid is performed by forming a temperature gradient in both end pipes of the heat accumulator 25 using surplus energy of the internal combustion engine 1 (heat energy of exhaust gas). Vibration (sound wave) can be generated, and the energy (acoustic energy) of the vibration can be converted into electric energy and heat energy. However, even if the surplus energy of the internal combustion engine 1 is recovered in this way and electric energy and heat energy are obtained, if the utilization efficiency of the obtained energy is poor, the meaning of using the energy recovery device 20 is lost. It can be broken.

  For this reason, in the present embodiment, the energy utilization rate control routine shown in FIG. 2 is predetermined by the ECU 40 so that the electric energy and the thermal energy obtained by recovering the surplus energy of the internal combustion engine 1 are effectively used. Repeated every hour.

That is, when the timing of execution of the energy utilization rate control routine is reached, the ECU 40 is first indicated by the current power consumption determined based on signals from lights, various auxiliary devices, and the signal from the fuel gauge RS. A power generation request index γe is calculated from the remaining amount of power stored in the power storage unit BU (S10). Here, the power generation requirement index γe is
γe = A × (power consumption) −B × (remaining power storage)
(Where A and B are predetermined coefficients). Further, the ECU 40 is based on a request for the air conditioning unit AC (required air conditioning amount) and a cold storage amount in the regenerator 250 determined from a detection value of the temperature sensor T (temperature of the refrigerant flowing out of the cold storage heat exchanger 270). Then, the cooling demand index γc is calculated (S12). Here, the cooling demand index γc is
γh = C × (required air conditioning amount) −D × (cold storage amount)
(Where C and D are predetermined coefficients).

Then, the ECU 40 calculates a target power generation utilization ratio ε that is a ratio of a target energy recovery amount (target power generation amount) of the transducer 24 to a total energy recovery amount of the energy recovery device 20 from these indexes γe and γc.
ε _T = γe / (γe + γc)
(S14).

When the target power generation utilization ratio ε _T is obtained, the ECU 40 further obtains the current power generation utilization ratio ε, which is the ratio of the energy recovery amount (power generation amount) of the transducer 24 to the total energy recovery amount of the energy recovery device 20 at that time ( S16). In the present embodiment, in order to obtain the current power generation utilization ratio ε, a function of the pressure amplitude of the working fluid that self-oscillates in the air column tube 21 and the inductance of the coil 243 included in the transducer 24 is set in advance. Stored in the storage device. Then, the ECU 40 obtains the current power generation utilization ratio ε using this function, the pressure amplitude of the working fluid acquired based on the signal from the pressure sensor 28, and the inductance of the coil 243 at that time.

With obtaining the target power use ratio epsilon _T in S14, when determining the current power use ratio epsilon at S16, ECU 40 is a value currently power use ratio epsilon is obtained by adding a predetermined hysteresis α to the target generation use ratio epsilon _T epsilon It is determined whether or not _T + α is exceeded (S18). If it is determined in S18 that the current power generation utilization ratio ε exceeds the value ε _T + α, the ECU 40 sets a predetermined amount to the power generation controller 240 so as to increase the inductance of the coil 243 by a predetermined amount so that the induced current decreases. The control signal is given (S20).

On the other hand, when it is determined in S18 that the current power generation use ratio ε does not exceed the value ε _T + α, the ECU 40 further has a value obtained by subtracting a predetermined hysteresis α from the target power generation use ratio ε _T. It is determined whether it is below ε _T -α (S22). If it is determined in S22 that the current power generation utilization ratio ε is less than the value ε _T -α, the ECU 40 causes the power generation controller 240 to reduce the inductance of the coil 243 by a predetermined amount so that the induced current increases. A predetermined control signal is given (S24).

When the processes of S20 and S24 are executed, the ECU 40 waits until the timing at which the energy utilization rate control routine is to be executed next. Further, when it is determined in S22 that the current power generation use ratio ε is not less than the value ε _T -α, the current power generation use ratio ε is substantially equal to the target power generation ratio ε _T , so the ECU 40 In particular, it waits until the next timing to execute the energy utilization rate control routine without controlling the power generation amount controller 240 or the like.

  As described above, in the energy recovery apparatus 20, the energy recovery amount (power generation amount) by the transducer 24 as the first energy conversion means and the cold heat amount (second energy conversion means) obtained by the cold storage heat exchanger 270. The ratio of the energy recovery amount) is changed as required. That is, in the energy recovery apparatus 20 and when heat energy (cold heat) is required rather than electric energy, the inductance of the coil 243 is increased so as to reduce the induced current (S20), and the transducer 24 Since the acoustic energy that is no longer recovered is recovered by the regenerator 250, it is possible to increase the amount of cold heat obtained by the low temperature heat exchanger 270 for cold storage. When electric energy is required rather than thermal energy, the inductance of the coil 243 is reduced (S24), thereby increasing the power generation amount of the transducer 24. Therefore, according to the energy recovery device 20, it is possible to improve the utilization efficiency of the energy obtained by recovering the surplus energy of the internal combustion engine 1.

  Also, in general, the amount of energy conversion is greater when the energy of sound waves is converted into electrical energy using the transducer 24 as sound / electricity conversion means than when the energy of sound waves is converted into heat energy in the regenerator 250. (Energy recovery amount) can be controlled easily and accurately. In view of this point, the energy recovery device 20 adjusts the inductance of the coil 243 and changes the energy recovery amount by the transducer 24 as the first energy conversion unit as described above, thereby generating the power generation amount by the transducer 24. And the ratio with the amount of cold heat obtained with the low-temperature heat exchanger 270 for cold storage is changed. Thereby, in the energy recovery apparatus 20, it becomes possible to set accurately the ratio between the amount of power generated by the transducer 24 and the amount of cold heat obtained by the cold storage heat exchanger 270 as required.

By the way, in the transducer 24 of the energy recovery device 20, as described above, the spring constant of the spring device 244 that elastically supports the wave receiving member 241 and the magnet 242 can be changed by controlling the on-off valve 245. . Here, if the spring constant of the spring device 244 is K and the mass of the wave receiving member 241 is m, the frequency (frequency) f of the wave receiving member 241 is expressed as f = 2π × √ (K / m). since the, by changing the spring constant K of the spring 244, the frequency f of the wave receiving element 241 can be made to coincide with the resonance frequency f ₀ of the acoustic wave in the air column 21.

In view of such a point, the energy recovery device 20, to match the frequency f of the wave receiving element 241 and the resonance frequency f ₀ of the acoustic wave in the air column 21, frequency control routine shown in FIG. 3 for a predetermined time Repeated every other time. That is, when the frequency control routine is executed, the ECU 40 determines the time between the pressure peaks of the working fluid that self-oscillates in the air column tube 21 based on the signal sent from the pressure sensor 28 (the time and pressure at which the pressure becomes maximum A time difference from the minimum time) is obtained, and the resonance frequency f ₀ of the working fluid in the air column tube 21 is obtained based on the time between the pressure peaks (S30, S32).

When the resonance frequency f ₀ of the working fluid in the air column tube 21 is obtained, the ECU 40 controls the on-off valve 245 to determine the resonance frequency f ₀ of the working fluid obtained in S 32 and the wave receiving member 241 of the transducer 24. The spring constant of the spring device 244 is changed so that the frequency f matches (S34). In this manner, by making the resonance frequency f ₀ of the working fluid coincide with the frequency f of the wave receiving member 241 of the transducer 24, sound waves generated by forming a temperature gradient between both ends of the heat accumulator 25 are attenuated. Therefore, electric energy can be obtained efficiently. Therefore, according to the energy recovery device 20, it is possible to improve the utilization efficiency of the energy obtained by recovering the surplus energy of the internal combustion engine 1.

  FIG. 4 is a schematic configuration diagram showing another embodiment of the energy recovery apparatus according to the present invention. The energy recovery device 20A shown in the figure includes a connecting pipe part 29 that connects the exhaust pipe L2 and the pipe part 23a of the air column pipe 21, and a diaphragm disposed in the end part of the connecting pipe part 29 on the exhaust pipe L2 side. 30. The diaphragm 30 functions as pulsation transmission means for preventing the exhaust gas from flowing into the air column tube 21 and transmitting the pulsation of the exhaust gas to the working fluid in the air column tube 21. Further, the energy recovery device 20A includes a presser member 31, a link mechanism 32, and an actuator 33 as pulsation transmission stopping means that stops vibration of the diaphragm 30 and stops transmission of pulsation to the working fluid in the air column tube 21. ing.

  As a result, in the energy recovery device 20A, when the internal combustion engine 1 is operated in a state where the pressing of the diaphragm 30 by the pressing member 31 is released, the pulsation of the exhaust gas is caused to flow through the diaphragm 30 and the working fluid in the air column tube 21. The sound wave is formed in the air column tube 21. And the energy of the sound wave generated by using the pulsation of the exhaust gas is similar to the energy of the sound wave generated due to the temperature gradient formed between both ends of the heat accumulator 25. 24 is converted into electric energy.

  Thus, according to the energy recovery device 20A, it is possible to obtain an acoustic output by vibrating the working fluid by both the pulsation of the exhaust gas and the temperature gradient formed in the heat accumulator 25. The energy utilization rate control routine of FIG. 2 and the frequency control routine of FIG. 3 can also be applied to the energy recovery apparatus 20A shown in FIG. That is, in the present invention, as an acoustic energy generating means for generating sound waves using the energy of the exhaust gas of the internal combustion engine 1, a heat accumulator, a high temperature heat exchanger and a low temperature heat exchanger unit, and the exhaust gas of the internal combustion engine 1 are used. It is possible to employ at least one of pulsation transmission means (diaphragm 30 or the like) for transmitting the pulsation of (or intake air) to the working fluid in the air column tube 21.

It is a schematic block diagram which shows one Embodiment of the energy recovery apparatus by this invention. It is a flowchart for demonstrating the control procedure of the energy recovery apparatus shown by FIG. It is a flowchart for demonstrating the other control procedure of the energy recovery apparatus shown by FIG. It is a schematic block diagram which shows other embodiment of the energy recovery apparatus by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 14 On-off valve 15 Exhaust supply adjustment valve 20, 20A Energy recovery device 21 Air column pipe 22 Loop part 23 Resonance part 23a Pipe part 23b Closed end part 24 Transducer 25 Heat accumulator 26 High temperature heat exchanger 26 Heat exchanger 27 Low temperature Heat exchanger 28 Pressure sensor 29 Connection pipe section 30 Diaphragm 31 Presser member 32 Link mechanism 33 Actuator 240 Power generation amount controller 241 Wave receiving member 242 Magnet 243 Coil 244 Spring device 245 On-off valve 250 Regenerator 260 High temperature heat exchanger 270 for regenerator Low-temperature heat exchanger AC for cold storage AC Air-conditioning unit BU Power storage unit L1 Air supply pipe L2 Exhaust pipe L3 Cooling system RS Fuel gauge T Temperature sensor

Claims (7)

An energy recovery device for recovering surplus energy of an internal combustion engine,
Acoustic energy generating means for generating sound waves using the surplus energy;
First energy converting means for converting sound wave energy generated by the acoustic energy generating means into electrical energy;
Second energy conversion means for converting the energy of the sound wave emitted by the acoustic energy generation means into thermal energy;
An energy recovery device for an internal combustion engine, comprising: control means for changing a ratio of an energy recovery amount by the first energy conversion means and an energy recovery amount by the second energy conversion means as required. A request determination means for determining a power demand amount for the first energy conversion means and a heat demand amount for the second energy conversion means;
The control unit changes a ratio of an energy recovery amount by the first energy conversion unit and an energy recovery amount by the second energy conversion unit according to a determination result of the request determination unit. The energy recovery device for an internal combustion engine according to claim 1.   The control means changes the ratio of the energy recovery amount by the first energy conversion means and the energy recovery amount by the second energy conversion means by changing the energy recovery amount by the first energy conversion means. The energy recovery device for an internal combustion engine according to claim 1, wherein the energy recovery device is an internal combustion engine.   The first energy conversion means includes a vibration member that vibrates in response to a sound wave, and means for matching the frequency of the vibration member with the frequency of the sound wave emitted by the acoustic energy generation means. The energy recovery device for an internal combustion engine according to any one of claims 1 to 3.   An air column tube filled with a predetermined working fluid is further provided, and the acoustic energy generating means includes a high-temperature heat exchanger using the exhaust gas of the internal combustion engine as a heat source, a low-temperature heat exchanger, and a heat exchanger of these heat exchangers. The internal combustion engine energy recovery device according to any one of claims 1 to 4, further comprising heat storage means disposed inside the air column tube so as to be positioned therebetween.   And further comprising an air column tube filled with a predetermined working fluid, wherein the acoustic energy generating means transmits a pulsation of intake air or exhaust gas of the internal combustion engine to the working fluid in the air column tube to generate a sound wave. An energy recovery device for an internal combustion engine according to any one of claims 1 to 4. An energy recovery device for recovering surplus energy of an internal combustion engine,
Acoustic energy generating means for generating sound waves using the surplus energy;
Energy converting means for converting sound wave energy emitted by the acoustic energy generating means into electric energy, the energy converting means receiving a sound wave and vibrating, and generating a frequency of the vibration member by generating the acoustic energy. An energy recovery device for an internal combustion engine, characterized by comprising means for matching the frequency of a sound wave emitted by the means.

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