JP2010038108A - Device for using waste heat of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for using waste heat of an internal combustion engine, having improved efficiency of energy recovery by securing the heat radiating capacities of both RC and AC condensers while reducing the size of a heat radiation unit. <P>SOLUTION: The waste heat utilizing device includes a cooling water circuit 4 having a radiator 12 for radiating the heat of cooling water heated by the waste heat of the internal combustion engine 2, with the ventilation of outside air, a Rankine cycle 6 having a first condenser 18 for radiating the heat of refrigerant passing through an expander 16, with the ventilation of outside air, and a refrigerating cycle 8 having a second condenser 26 for radiating the heat of the refrigerant whose temperature rises with compressing work, with the ventilation of outside air. The first and second condensers and the radiator constitute the heat radiation unit 32. The heat radiation unit has the first and second condensers arranged almost flush with each other in sequence from the direction of the ventilation of outside air, and the radiator arranged therebehind. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a waste heat utilization apparatus for an internal combustion engine, and more particularly to a waste heat utilization apparatus for an internal combustion engine that is suitable for being mounted on a vehicle.

This type of internal combustion engine waste heat utilization device is mounted on a vehicle, for example, collects waste heat via cooling water that cools the vehicle engine, and is driven by expanding the refrigerant heated by the waste heat. An expander that generates force, a Rankine cycle (RC circuit) having a Rankine cycle capacitor (RC capacitor) that dissipates heat by passing outside air through the expander, and a refrigerant heated by the air in the passenger compartment A compressor and an air conditioner cycle (AC circuit) having an air conditioner cycle capacitor (AC capacitor) that dissipates heat by passing outside air through the compressor are disclosed (for example, see Patent Document 1).
JP 2004-308424 A

By the way, in general, the cooling water heated by the waste heat of the engine of the vehicle is radiated by the ventilation of the outside air by the radiator, and in the order of the ventilation direction of the outside air, that is, from the front side of the vehicle, in order of the AC capacitor, the RC capacitor, and the radiator. It is arranged.
In this case, since the warmed air that has passed through the AC capacitor is passed through the RC capacitor, the heat dissipation capability of the RC capacitor is reduced.

Further, the heat radiation capacity of the RC capacitor and the AC capacitor changes every time depending on the vehicle speed and the outside air temperature.
However, in the above-described conventional technology, no special consideration is given to these points, and while ensuring the heat dissipation capability of both the RC and AC capacitors while reducing the size of the heat dissipation unit composed of the RC and AC capacitors and the radiator, Problems remain in improving the energy recovery efficiency of waste heat utilization equipment.

  The present invention has been made in view of such problems, and the object of the present invention is to ensure the heat dissipation capability of both the RC and AC capacitors while reducing the size of the heat dissipation unit, and to use the waste heat of the internal combustion engine. The device is to improve the energy recovery efficiency.

  In order to achieve the above object, a waste heat utilization apparatus for an internal combustion engine according to claim 1 includes a cooling water circuit having a radiator that radiates heat of cooling water heated by waste heat of the internal combustion engine by ventilation of outside air, and cooling water. An expander that expands the refrigerant heated by the generator to generate a driving force, a Rankine cycle that dissipates the refrigerant that has passed through the expander by the ventilation of the outside air, and a refrigerant that has risen in temperature due to compression work. A refrigeration cycle having a second condenser that radiates heat by ventilation, and the first and second condensers and the radiator constitute a heat radiating unit. The heat radiating unit substantially omits the first and second condensers in order from the ventilation direction of the outside air. It is characterized by the fact that it is arranged flush and a radiator is arranged behind them.

  According to a second aspect of the present invention, in the first aspect, the first capacitor is divided into a first front heat radiating portion and a first rear heat radiating portion, and the second capacitor is divided into a second front heat radiating portion and a second rear heat radiating portion. The heat dissipating unit is divided into a heat dissipating unit, and the heat dissipating unit includes a first front heat dissipating unit and a second front heat dissipating unit which are arranged substantially flush with each other in order from the direction of the outside air. The first rear heat dissipating part and the second rear heat dissipating part are arranged substantially flush with each other at a position diagonal to the heat dissipating part, and a radiator is arranged behind them.

  Further, according to a third aspect of the present invention, in the first aspect, the second capacitor is divided into a second front heat dissipating part and a second rear heat dissipating part, and the heat dissipating units are arranged in order from the ventilation direction of the outside air. And the second front heat dissipating part are substantially flush with each other, and the radiator and the second rear heat dissipating part are substantially flush with the first capacitor and the second front heat dissipating part at the rear of these. It is characterized by.

Furthermore, the invention according to claim 4 is characterized in that, in claim 2, the first capacitor is arranged in the order of the first rear heat dissipating part and the first front heat dissipating part as viewed from the direction of refrigerant flow in the Rankine cycle. Yes.
According to a fifth aspect of the present invention, in any one of the second to fourth aspects, the second condenser is arranged in the order of the second rear heat dissipating part and the second front heat dissipating part as viewed from the refrigerant flow direction of the refrigeration cycle. It is characterized by that.

Further, the invention according to claim 6 is characterized in that, in claim 4, the radiator has a heat radiation area smaller than any one of the first and second capacitors.
Furthermore, in the invention according to claim 7, in claim 6, the refrigerant heated by the cooling water is further heated by the exhaust gas of the internal combustion engine, and the exhaust gas heat exchanger is bypassed to bypass the refrigerant to the Rankine cycle. When the cooling water temperature detected by the cooling water temperature detecting means is equal to or higher than a predetermined set temperature, the cooling water temperature detecting means for detecting the temperature of the cooling water for cooling the internal combustion engine is provided. The exhaust gas heat exchanger is bypassed by the bypass means.

  According to an eighth aspect of the present invention, in the second, fourth, sixth, or seventh aspect, the first communicating means for communicating the inlet of the first rear heat radiating portion and the inlet of the second rear heat radiating portion; Second communicating means for communicating the outlet of the first part and the outlet of the second front heat dissipating part, and when the Rankine cycle is stopped, the first communicating means and the inlet of the second rear heat dissipating part by the first communicating means And the outlet of the first front heat dissipating part and the outlet of the second front heat dissipating part are communicated by the second communication means, and the first and second capacitors are used in the refrigeration cycle.

  Further, in the invention according to claim 9, in claim 2, 4 or 6, 6 or 7 or 8, the first communication means for communicating the inlet of the first rear heat radiating portion and the inlet of the second rear heat radiating portion; A second communicating means for communicating the outlet of the front heat radiating section and the outlet of the second front heat radiating section; and when the operation of the refrigeration cycle is stopped, the inlet of the first rear heat radiating section and the second rear heat radiating section by the first communication means And the outlet of the first front heat radiating portion and the outlet of the second front heat radiating portion are communicated by the second communication means, and the first and second capacitors are used in the Rankine cycle. .

Furthermore, in the invention of claim 10, in claim 1, when the Rankine cycle operation is stopped, the inlet of the first capacitor and the inlet of the second capacitor are communicated, and the outlet of the first capacitor and the second capacitor are connected. The outlet is in communication with each other, and the first and second capacitors are used in the refrigeration cycle.
According to an eleventh aspect of the present invention, in the first or tenth aspect, when the operation of the refrigeration cycle is stopped, the inlet of the first capacitor communicates with the inlet of the second capacitor, and the outlet of the first capacitor and the second capacitor. And the first and second capacitors are used in a Rankine cycle.

  Therefore, according to the waste heat utilization apparatus for an internal combustion engine of the first aspect of the present invention, the heat dissipating unit that dissipates the refrigerant by ventilating the outside air is substantially flush with the first and second capacitors in order from the venting direction of the outside air. And a radiator is arranged behind them. As a result, only the warmed air after the second capacitor is ventilated through the first capacitor is prevented from being ventilated, and the outside air can be evenly ventilated through the first capacitor and the second capacitor. While reducing the size of the heat dissipating unit, the heat dissipating ability of both the first and second capacitors can be secured, and the energy recovery efficiency of the waste heat utilization device can be improved.

  According to the second aspect of the present invention, the heat dissipating unit arranges the first front heat dissipating part and the second front heat dissipating part approximately flush with each other in order from the outside air ventilation direction, and the first front heat dissipating part behind them. The first rear heat dissipating part and the second rear heat dissipating part are arranged substantially flush with each other at the diagonal positions of the first part and the second front heat dissipating part, and a radiator is arranged behind them. Thereby, while ensuring the heat radiation area of the heat radiation part of a 1st capacitor | condenser and a 2nd capacitor | condenser, since outside air can be ventilated in steps in these, the heat radiation capability of both the 1st and 2nd capacitor | condenser is further ensured. The energy recovery efficiency of the waste heat utilization device can be further improved.

  Furthermore, according to the invention of claim 3, in the heat dissipation unit, the first capacitor and the second front heat dissipating part are arranged substantially flush with each other in order from the direction in which the outside air passes, and the first capacitor and the second capacitor are disposed behind them. The radiator and the second rear heat dissipating part are arranged substantially flush with each other at positions diagonal to the front heat dissipating part. Thereby, while being able to ensure the heat dissipation capability of both the 1st and 2nd capacitor | condenser, further size reduction of the thermal radiation unit 32 can be achieved.

  Furthermore, according to invention of Claim 4 and 5, a 1st capacitor | condenser is distribute | arranged in order of the 1st back heat radiating part and the 1st front heat radiating part seeing from the flow direction of the refrigerant | coolant of Rankine cycle (Claim 4), The second capacitor is arranged in the order of the second rear heat radiating portion and the second front heat radiating portion as viewed from the refrigerant flow direction of the refrigeration cycle. By these, since the refrigerant | coolant which circulates through a Rankine cycle and a refrigerating cycle can be condensed in steps, respectively, and the heat radiation part of both the 1st and 2nd capacitor | condenser can be used efficiently, Energy recovery efficiency can be further improved.

  According to the sixth aspect of the present invention, the radiator has a smaller heat radiation area than either one of the first and second capacitors. As a result, the space behind the first and second capacitors can be expanded, and the amount of airflow to the entire heat radiating unit can be increased, so that the heat radiating capacity of the entire heat radiating unit can be improved, and consequently the waste heat utilization device. Energy recovery efficiency can be further improved.

  Further, according to the seventh aspect of the present invention, when the cooling water temperature detected by the cooling water temperature detection means is equal to or higher than a predetermined set temperature, the exhaust gas heat exchanger is bypassed by the bypass means. As a result, when the amount of waste heat of the internal combustion engine is large, the heat of the cooling water can be actively dissipated by the first condenser even on the Rankine cycle side, so the cooling water temperature is lowered and the cooling water temperature is increased. Can be prevented.

  Furthermore, according to the invention described in claim 8, when the Rankine cycle operation is stopped, the first communicating means communicates the inlet of the first rear heat radiating section and the inlet of the second rear heat radiating section, and the second communicating means. Thus, the outlet of the first front heat radiating portion and the outlet of the second front heat radiating portion are communicated, and the first and second capacitors are used in the refrigeration cycle. As a result, when the amount of waste heat of the internal combustion engine is small or the amount of outside air is small and the amount of waste heat recovered in the Rankine cycle is small, the refrigerant circulating in the refrigeration cycle is also passed through the first condenser, Since one capacitor can be used as the second capacitor and the heat dissipation capability of the second capacitor can be substantially increased, the power consumption of the refrigeration cycle can be reduced.

  According to the ninth aspect of the invention, when the operation of the refrigeration cycle is stopped, the inlet of the first rear heat dissipating part and the inlet of the second rear heat dissipating part are communicated by the first communicating means, and the second communicating means The outlet of the first front heat radiating portion and the outlet of the second front heat radiating portion are communicated, and the first and second capacitors are used in the Rankine cycle. Thereby, when the amount of waste heat of the internal combustion engine is large, the refrigerant circulating in the Rankine cycle is also passed through the second capacitor, the second capacitor is used as the first capacitor, and the heat dissipation capability of the first capacitor is substantially increased. Can be increased. Therefore, since the amount of waste heat recovered from the Rankine cycle can be increased, the energy recovery efficiency of the waste heat utilization device can be further improved, and an increase in the cooling water temperature can be prevented.

Hereinafter, embodiments of the present invention will be described from the first embodiment with reference to the drawings.
FIG. 1 schematically shows a schematic view of a waste heat utilization apparatus for an internal combustion engine according to the present embodiment.
This waste heat utilization device is mounted on a vehicle, for example, and is provided with a cooling water circuit 4 for cooling an engine (internal combustion engine) 2 of the vehicle, and a Rankine cycle circuit (Rankine cycle) 6 (hereinafter referred to as RC) for recovering waste heat of the engine 2. Circuit) and an air conditioner cycle circuit (refrigeration cycle) 8 (hereinafter referred to as an AC circuit) for air conditioning the vehicle interior of the vehicle.

The cooling water circuit 4 constitutes a closed circuit by inserting an evaporator 10, a radiator 12, and the like in order from a cooling water flow direction in a cooling water circulation path 5 extending from the engine 2.
The evaporator 10 exchanges heat between the cooling water circulating in the cooling water circuit 4 and the refrigerant circulating in the RC circuit 6, thereby using the cooling water heated by the engine 2, that is, hot water as a heat medium as waste heat of the engine 2. Is absorbed by the refrigerant on the RC circuit 6 side.

The radiator 12 is a radiator that is arranged in series with the evaporator 10 and further cools the cooling water that has been absorbed by the refrigerant through the evaporator 10 and is cooled by being radiated from the ventilation of the outside air. On the other hand, the cooling water whose temperature has been lowered sequentially through the evaporator 10 and the radiator 12 becomes warm water heated again by cooling the engine 2.
On the other hand, the RC circuit 6 enters the refrigerant circulation path 7 in the order of the refrigerant flow direction (indicated by arrows), the evaporator 10, the exhaust gas heat exchanger (exhaust gas heat exchanger) 14, the expander 16, the Rankine cycle condenser (the first). 1 capacitor) 18 (hereinafter referred to as RC capacitor), liquid receiver 20 and pump 22 are inserted in this order to form a closed circuit.

The exhaust gas heat exchanger 14 is a heater that heats the refrigerant with the exhaust gas that is purified and discharged by the catalyst 24 from the engine 2 through the exhaust gas pipe 15, and further heats the refrigerant heated by the cooling water in the evaporator 10. ing.
The expander 16 is a fluid device that expands the refrigerant that has been heated by the exhaust gas heat exchanger 14 and is in the state of superheated steam, and generates a rotational driving force. The expander 20 includes the generated rotational driving force. A power generator (not shown) that converts the power to be used outside the waste heat utilization device is mechanically connected.

The RC condenser 18 is a radiator that radiates the refrigerant expanded in the expander 16 by the ventilation of the outside air and liquefies it.
The liquid receiver 20 separates the refrigerant condensed by the RC condenser 18 into two layers of gas and liquid, and only the separated liquid refrigerant flows out to the pump 22 side.
The pump 22 circulates the circulation path 7 by pumping the liquid refrigerant flowing out from the liquid receiver 20 to the evaporator 10 side.

On the other hand, the AC circuit 8 is connected to the refrigerant circulation path 9 in order from the refrigerant flow direction (indicated by an arrow), an air conditioner cycle capacitor (second capacitor) 26 (hereinafter referred to as an AC capacitor), and other liquid receiver (not shown). In addition, constituent devices 28 such as an expansion valve, an evaporator, and a compressor are inserted to form a closed circuit.
The evaporator is a heat exchanger that exchanges heat between the air in the vehicle interior of the vehicle and the refrigerant in the AC circuit 8, and evaporates the refrigerant using the air in the vehicle interior as a heat source, so that the AC circuit 8 side The heat of the air is recovered and the passenger compartment is adjusted to a desired air conditioning temperature.

The compressor is driven by a predetermined power source, compresses the refrigerant evaporated by the evaporator, and is in the state of superheated steam.
The AC condenser 26 is a radiator that dissipates the refrigerant discharged from the compressor by the ventilation of the outside air and liquefies it. The liquid refrigerant that passes through the AC condenser 26 is sent to the expansion valve via the receiver, and the expansion valve After being expanded via, it is delivered to the evaporator.

By the way, in this embodiment, the RC capacitor 18 is divided into a rear heat radiating portion (first rear heat radiating portion) 18A and a front heat radiating portion (first front heat radiating portion) 18B having substantially the same heat radiating area. , 18B are arranged in the order of the rear heat dissipating part 18A and the front heat dissipating part 18B, as viewed from the flow direction of the refrigerant in the RC circuit 6.
On the other hand, the AC capacitor 26 is also divided into a rear heat dissipating part (second rear heat dissipating part) 26A and a front heat dissipating part (second front heat dissipating part) 26B having substantially the same heat dissipating area. When viewed from the flow direction of the refrigerant in the circuit 8, the rear heat radiating portion 26A and the front heat radiating portion 26B are arranged in this order.

The RC and AC capacitors 18 and 26 configured in this manner and the radiator 12 constitute a heat radiating unit 32 that radiates heat by ventilation of outside air. For easy understanding, the heat radiating portion used as the RC capacitor 18 is hatched, and the heat radiating portion of the radiator 12 is shown in black (the same applies hereinafter).
FIG. 2 is a perspective view of the heat radiating unit 32 as viewed from above the front surface 30 a side of the vehicle 30.

As is apparent from this figure, the heat radiating unit 32 has the front heat radiating portions 18B and 26B arranged substantially flush with each other in order from the outside air flow direction, and the pair of the front heat radiating portion 18B and the front heat radiating portion 26B behind them. The rear heat dissipating part 18A and the rear heat dissipating part 26A are arranged substantially flush with each other at the corners, and the radiator 12 is arranged behind them.
The radiator 12 has a heat radiation area approximately half that of the RC and AC capacitors 18 and 26, and is disposed at a position where only the back surface of the rear heat radiation portion 26A is overlapped.

Two common fans 34A and 34B are arranged on the back side of the heat radiating unit 32, and each fan 34A and 34B controls the amount of outside air ventilated through the heat radiating unit 32.
Here, as shown in FIG. 1, in this embodiment, the RC circuit 6 is provided with a bypass path 36 for bypassing the exhaust gas heat exchanger 14 and circulating the refrigerant, and the bypass path 36 has an electromagnetic valve 38. Is inserted (bypass means), and the cooling water circuit 4 is provided with a temperature sensor (cooling water temperature detecting means) 40 for detecting the temperature Tc of the cooling water for cooling the engine 2.

  The solenoid valve 38 and the temperature sensor 40 are electrically connected to an ECU (electronic control unit) (not shown) that comprehensively controls the entire vehicle including the waste heat recovery device. In the ECU, the RC and AC circuits 6 and 8 are connected. RC / AC circuit control for controlling the operation of the exhaust gas heat exchanger 18 is performed by opening and closing the electromagnetic valve 38 in accordance with the coolant temperature Tc detected by the temperature sensor 40 in this RC / AC circuit control. Control to bypass is performed.

The RC / AC circuit control routine will be described below with reference to the flowchart of FIG.
First, when this control is started, the process proceeds to S1, and in S1, it is determined whether or not the cooling water temperature Tc is equal to or higher than a predetermined first set temperature Ts1 (Tc ≧ Ts1), and the determination result is true (Yes). ), When it is determined that Tc ≧ Ts1 is satisfied, the process proceeds to S2. When the determination result is false (No), it is determined that Tc ≧ Ts1 is not satisfied, the process proceeds to S3.

In S2, when the pump 22 is stopped, the RC circuit 6 is operated by driving the pump 22, and then the process proceeds to S4.
On the other hand, in S3, when the pump 22 is driven, the operation of the RC circuit 6 is stopped by stopping the pump 22, and then this control is returned.
In S4, it is determined whether or not the cooling water temperature Tc is equal to or higher than a predetermined second set temperature (set temperature) Ts2 (Ts2> Ts1) (Tc ≧ Ts2). If the determination result is true (Yes), Tc ≧ Ts2 If it is determined that is satisfied, the process proceeds to S5. If the determination result is false (No) and it is determined that Tc ≧ Ts2 is not satisfied, the process proceeds to S6.

In S5, when the solenoid valve 38 is closed, the solenoid valve 38 is opened to connect the bypass passage 36 to bypass the exhaust gas heat exchanger 14, and then the process proceeds to S7.
On the other hand, in S6, when the solenoid valve 38 is opened, the bypass valve 36 is closed by closing the solenoid valve 38, and then this control is returned.
In S7, it is determined whether or not the cooling water temperature Tc is equal to or higher than a predetermined third set temperature Ts3 (Ts3> Ts2) (Tc ≧ Ts3), and it is determined that Tc ≧ Ts3 is satisfied when the determination result is true (Yes). If YES, the process proceeds to S8. If it is determined that the determination result is false (No) and Tc ≧ Ts3 is not satisfied, the present control is returned.

In S8, the rotational speed or operating rate or discharge capacity of the compressor constituting the AC circuit 8 is reduced by a predetermined amount, and then this control is returned.
As described above, in the present embodiment, the heat radiating unit 32 divides the RC capacitor 18 into the rear heat radiating portion 18A and the front heat radiating portion 18B, and divides the AC capacitor 26 into the rear heat radiating portion 26A and the front heat radiating portion 26B. Then, the front heat radiating portions 18B and 26B are arranged substantially flush with each other in order from the direction of the outside air flow, and the rear heat radiating portions 18A and 18A are respectively positioned diagonally between the front heat radiating portion 18B and the front heat radiating portion 26B. The rear heat radiating portion 26A is arranged substantially flush with each other, and the radiator 12 is arranged behind them. Thereby, it is prevented that only the warmed air after the AC capacitor 26 is passed through the RC capacitor 18, and the outside air can be evenly passed through the RC capacitor 18 and the AC capacitor 26.

In addition, since the outside air can be ventilated stepwise while securing the heat radiation area of the heat radiation portion between the RC capacitor 18 and the AC capacitor 26, the RC and AC capacitors 18,. Therefore, the heat recovery capability of both of them can be secured, and the energy recovery efficiency of the waste heat utilization device can be improved.
The RC capacitor 18 is arranged in the order of the rear heat radiating portion 18A and the front heat radiating portion 18B as viewed from the refrigerant flow direction in the RC circuit 6, and the AC capacitor 26 is viewed from the refrigerant flow direction in the AC circuit 8. The rear heat radiation part 26A and the front heat radiation part 26B are arranged in this order. As a result, the refrigerant circulating through the RC and AC circuits 6 and 8 can be condensed stepwise, and the heat dissipating parts of both the RC and AC capacitors 18 and 26 can be used efficiently. The energy recovery efficiency of the utilization device can be further improved.

  Further, the radiator 12 has a heat radiation area that is substantially half smaller than the heat radiation area of the RC and AC capacitors 18 and 26, thereby expanding the space behind the RC and AC capacitors 18 and 26, and ventilating the entire heat radiation unit 32. Since the amount can be increased, the heat dissipating capacity of the entire heat dissipating unit 32 can be improved, and as a result, the energy recovery efficiency of the waste heat utilization apparatus can be further improved.

  Furthermore, in the RC / AC circuit control, when the cooling water temperature Tc detected by the temperature sensor 40 is equal to or higher than a predetermined second set temperature Tc2, the exhaust gas heat exchanger 14 is bypassed, so that the engine 2 is discarded. When the amount of heat is large, the heat of the cooling water can be actively dissipated by the RC capacitor 18 even on the RC circuit 6 side, so that an increase in the cooling water temperature can be prevented.

Next, a second embodiment of the present invention will be described.
FIG. 4 schematically shows a schematic diagram of a waste heat utilization apparatus for an internal combustion engine according to the second embodiment.
In the second embodiment, all of the RC and AC capacitors 18 and 26 in the first embodiment can be used as either the RC capacitor 18 or the AC capacitor 26, and the others are the same as those in the first embodiment. It has the same configuration.

In the present embodiment, the inlet of the rear heat dissipating part 18A and the inlet of the rear heat dissipating part 26A are communicated across the RC circuit 6 and the AC circuit 8 so that the heat dissipating unit inlets of the circuits 6 and 8 communicate with each other. A first communication path 42 is provided, and a heat radiation unit inlet side electromagnetic valve 44 is inserted in the first communication path 42 (first communication means).
Similarly, in order to communicate between the heat radiation unit outlet sides of the circuits 6 and 8 across the RC circuit 6 and the AC circuit 8, the outlet of the front heat radiating portion 18A and the outlet of the front heat radiating portion 26A are communicated. A two communication passage 46 is provided, and a heat radiation unit outlet side solenoid valve 48 is inserted in the second communication passage 46 (second communication means).

In the RC / AC circuit control executed by the ECU, the RC and AC capacitors 18 and 26 are all RC by opening and closing the electromagnetic valves 44 and 48 according to the cooling water temperature Tc detected by the temperature sensor 40. Control is performed to enable use as either one of the capacitor 18 or the AC capacitor 26.
Hereinafter, the control routine for RC / AC circuit control will be described with reference to the flowchart of FIG. Note that the description of the same steps as the RC / AC circuit control of the first embodiment is omitted.

First, when this control is started and it is determined in S1 that the determination result is false (No) and Tc ≧ Ts1 is not established, the process proceeds to S11.
In S11, it is determined whether or not the cooling water temperature Tc is lower than a predetermined lower limit set temperature TsL (TsL <Ts1) (Tc <TsL), and it is determined that Tc <TsL is satisfied when the determination result is true (Yes). If it is determined that the determination result is false (No) and Tc <TsL is not satisfied, the present control is returned.

In S12, when the pump 22 is driven, the operation of the RC circuit 6 is stopped by stopping the pump 22, and then the process proceeds to S13.
In S13, when the solenoid valves 44 and 48 are closed, the solenoid valves 44 and 48 are opened, the first and second communication passages 42 and 46 are communicated, and then this control is returned. .
On the other hand, after the rotational speed or operating rate or discharge capacity of the compressor constituting the AC circuit 8 is reduced by a predetermined amount in S8, the process proceeds to S21.

In S21, it is determined whether or not the coolant temperature Tc is equal to or higher than a predetermined upper limit set temperature TsH (TsH> Ts3) (Tc ≧ TsH), and it is determined that the determination result is true (Yes) and Tc ≧ TsH is satisfied. If it is determined that the determination result is false (No) and Tc ≧ TsH is not established, the present control is returned.
In S22, when the compressor which comprises AC circuit 8 is driving, after stopping operation of AC circuit 8 by stopping this compressor, it shifts to S23.

In S23, when the solenoid valves 44 and 48 are closed, the solenoid valves 44 and 48 are opened, the first and second communication passages 42 and 46 are communicated, and then this control is returned. .
As described above, in the present embodiment, in the RC / AC circuit control, when the coolant temperature Tc detected by the temperature sensor 40 is lower than the predetermined lower limit set temperature TsL, the operation of the RC circuit 6 is stopped, The first and second communication passages 42 and 46 are communicated. Thereby, when the load of the engine 2 is small due to idling of the engine 2 and the amount of waste heat is small, or when the amount of outside air is small due to low speed travel of the vehicle 30 and the amount of waste heat recovery in the RC circuit 6 is small. 6, the refrigerant circulating in the AC circuit 8 is also passed through the RC capacitor 18, and the RC capacitor 18 is used as the AC capacitor 26 to substantially increase the heat dissipation capability of the AC capacitor 26. be able to. Accordingly, the driving torque of the compressor or the like constituting the AC circuit 8 can be further reduced, and the power consumption thereof can be further reduced, so that the power consumption of the AC circuit 8 can be further reduced.

Note that when the environmental heat load is high such as in summer, an increase in the amount of waste heat recovered in the RC circuit 6 cannot be expected so much. In this case as well, the RC capacitor 18 is used as the AC capacitor 26 and the heat dissipation of the AC capacitor 26 is performed. It is preferred to substantially increase the capacity.
On the other hand, in the RC / AC circuit control, when the coolant temperature Tc detected by the temperature sensor 40 is equal to or higher than the predetermined upper limit set temperature TsH, the operation of the AC circuit 8 is stopped, and the first and second communication paths 42 are stopped. , 46 are communicated. As a result, when the load on the engine 2 is large and the amount of waste heat is large, as shown in FIG. 7, the refrigerant circulating in the RC circuit 6 is also passed through the AC capacitor 26, and the AC capacitor 26 is connected to the RC capacitor. 18 and the heat dissipation capability of the RC capacitor 18 can be substantially increased, so that the amount of waste heat recovered by the RC circuit 6 can be increased, and the energy recovery efficiency of the waste heat utilization device can be further improved. it can.

The description of one embodiment of the present invention is finished above, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the second embodiment, the RC and AC capacitors 18 and 26 can all be used as either the RC capacitor 18 or the AC capacitor 26. However, the circuit configuration of the RC and AC circuits 6 and 8 is different. By changing (not shown), as shown in FIG. 8, any one of the heat radiating portions 26 </ b> A and 26 </ b> B of the AC capacitor 26 can be used as one of the heat radiating portions of the RC capacitor 18. The structure of the heat radiating unit 32 is such that the waste heat amount of the engine 2 increases due to the high-speed traveling of the vehicle 30 and an increase in the waste heat recovery amount of the RC circuit 6 can be expected, or the environmental heat load in the winter season is low. It is suitable when the indoor set temperature is low and the cooling capacity required for the AC circuit 8 is small, and the energy recovery efficiency of the waste heat utilization apparatus can be further improved.

  Further, in each of the above-described embodiments, the radiator 12 has a heat radiation area that is substantially half that of the RC and AC capacitors 18 and 26, and is disposed at a position that is overlapped only on the rear surface of the rear heat radiation portion 26A. As shown, the radiator 12 may have a heat radiation area substantially equal to that of the RC and AC capacitors 18 and 26, and the fin pitch (not shown) of the radiator 12 may be increased instead. Also in this case, since the amount of ventilation with respect to the whole heat radiating unit 32 can be increased, the heat radiating capacity of the whole heat radiating unit 32 can be improved, and as a result, the energy recovery efficiency of the waste heat utilization apparatus can be improved.

Further, in each of the above embodiments, the RC and AC capacitors 18, 26 are divided in the width direction of the vehicle 30, but as shown in a side perspective view of the vehicle 30 in FIG. In this case, the same effect as described above can be obtained.
Furthermore, in each of the above embodiments, each of the heat radiating portions 18A, 18B, 26A, 26B divided from the RC and AC capacitors 18, 26 is separate, but as shown in the perspective view of the heat radiating unit 32 in FIG. In addition, for example, the front heat dissipating parts 18B and 26B and the rear heat dissipating parts 18B and 26B in the case of FIG. 10 may be integrated respectively. In this case, the heat dissipating unit 32 can be further reduced in size.

  Further, in each of the above embodiments, the heat radiating portions of the RC and AC capacitors 18 and 26 are each divided into two parts. However, as shown in FIG. 12, the RC capacitor 18 is formed compact in advance, and only the AC capacitor 26 is provided. The front heat radiating part 26A and the rear heat radiating part 26B are divided, and the RC capacitor 18 and the front heat radiating part 26B are arranged substantially flush with each other in order from the direction of the outside air. The radiator 12 and the rear heat dissipating part 26A may be arranged substantially flush with each other at the diagonal positions of the heat dissipating unit 32. In this case, the heat radiation unit 32 can be further reduced in size, which is preferable.

  Further, in each of the above embodiments, the heat radiation portions of the RC and AC capacitors 18 and 26 are each divided into two parts, but although not shown in the drawings, the heat radiation portions of the RC and AC capacitors 18 and 26 are substantially divided without being divided. Alternatively, the heat radiating unit may be configured as the heat radiating unit 32 by arranging the radiator 12 behind the air radiating unit as viewed from the direction of the outside air. In this case, when the operation of the RC circuit 6 is stopped, the inlet of the RC capacitor 18 and the inlet of the AC capacitor 26 are made to communicate with each other, and the outlet of the RC capacitor 18 and the outlet of the AC capacitor 26 are made to communicate with each other. AC capacitors 18 and 26 can be used in the AC circuit 8.

On the other hand, when the operation of the AC circuit 8 is stopped, the RC capacitor 18 and the AC capacitor 26 are connected to each other, and the RC capacitor 18 and the AC capacitor 26 are connected to each other. , 26 can be used in the RC circuit 6, and in this case, the heat radiation unit 32 can be further reduced in size, which is preferable.
Finally, in each of the above-described embodiments and modifications, it is assumed that the RC circuit 6 has the exhaust gas heat exchanger 14, but this is not limited to this circuit configuration, and the RC circuit without the exhaust gas heat exchanger 14 is used. In the circuit configuration 6 as well, it is possible to improve the energy recovery efficiency of the waste heat utilization device while reducing the size of the heat dissipation unit 32 only by configuring the heat dissipation unit 32 in the same manner as described above.

It is the schematic diagram which showed the waste-heat utilization apparatus of the internal combustion engine which concerns on 1st Embodiment of this invention. It is the perspective view which showed the thermal radiation unit of FIG. 1 from upper direction of the front side of a vehicle. It is the flowchart which showed the control routine of RC / AC circuit control performed with the waste heat utilization apparatus of FIG. It is the schematic diagram which showed the waste-heat utilization apparatus of the internal combustion engine which concerns on 2nd Embodiment of this invention. It is the flowchart which showed the control routine of RC / AC circuit control performed with the waste heat utilization apparatus of FIG. It is the perspective view which showed the front side of the vehicle at the time of using the RC capacitor | condenser of the thermal radiation unit of FIG. 4 as an AC capacitor | condenser from upper direction. It is the perspective view which showed the front side of the vehicle at the time of using the RC capacitor | condenser of the thermal radiation unit of FIG. 4 as an AC capacitor | condenser from upper direction. It is the perspective view which showed the thermal radiation unit which concerns on the modification of this invention from the upper front side of the vehicle. It is the perspective view which showed the thermal radiation unit which concerns on another modification of this invention from the upper front side of the vehicle. It is the perspective view which showed the thermal radiation unit which concerns on another modification of this invention from the side of the front side of a vehicle. It is a perspective view at the time of integrating the heat radiating unit of FIG. It is the perspective view which showed the thermal radiation unit which concerns on another modification of this invention from the upper front side of the vehicle.

Explanation of symbols

2 Engine (Internal combustion engine)
4 Cooling water circuit 6 Rankine cycle circuit (Rankine cycle)
8 Air conditioner cycle circuit (refrigeration cycle)
12 Radiator 14 Exhaust gas heat exchanger 16 Expander 18 Rankine cycle condenser (first condenser)
18A Rear heat dissipation part (first rear heat dissipation part)
18B Front heat dissipation part (first front heat dissipation part)
26 Air conditioner cycle capacitor (second capacitor)
26A Rear heat radiation part (second rear heat radiation part)
26B Front heat dissipation part (second front heat dissipation part)
32 Heat dissipation unit 36 Bypass path (bypass means)
38 Solenoid valve (bypass means)
40 Temperature sensor (cooling water temperature detection means)
42 1st communication path (1st communication means)
44 Heat release unit inlet side solenoid valve (first communication means)
46 Second communication path (second communication means)
48 Heat release unit outlet side solenoid valve (second communication means)

Claims (11)

A cooling water circuit having a radiator for radiating the cooling water heated by the waste heat of the internal combustion engine by ventilating outside air;
An expander that expands the refrigerant heated by the cooling water to generate a driving force, a Rankine cycle that has a first capacitor that dissipates heat by passing outside air through the expander; and
A refrigeration cycle having a second condenser for radiating heat of the refrigerant whose temperature has been increased by compression work by ventilating outside air;
A heat dissipating unit is composed of the first and second capacitors and the radiator,
The heat dissipating unit uses the waste heat of an internal combustion engine in which the first and second capacitors are arranged substantially flush with each other in order from the direction of the outside air, and the radiator is arranged behind them. apparatus. The first capacitor is divided into a first front heat dissipating part and a first rear heat dissipating part, and the second capacitor is divided into a second front heat dissipating part and a second rear heat dissipating part,
In the heat dissipation unit, the first front heat dissipating part and the second front heat dissipating part are arranged substantially flush with each other in order from the direction of the outside air, and the first front heat dissipating part and the second front heat dissipating part are arranged behind them. The first rear heat dissipating part and the second rear heat dissipating part are arranged substantially flush with each other at positions opposite to each other, and further, the radiator is arranged behind them. The waste heat utilization apparatus of the internal combustion engine as described. The second capacitor is divided into a second front heat radiating portion and a second rear heat radiating portion,
In the heat dissipation unit, the first capacitor and the second front heat dissipating part are arranged substantially flush with each other in order from the direction of the outside air, and diagonally between the first capacitor and the second front heat dissipating part behind them. 2. The waste heat utilization apparatus for an internal combustion engine according to claim 1, wherein the radiator and the second rear heat radiating portion are arranged substantially flush with each other at a position where   3. The waste heat of the internal combustion engine according to claim 2, wherein the first condenser is disposed in the order of the first rear heat radiating portion and the first front heat radiating portion as viewed from the flow direction of the refrigerant in the Rankine cycle. Use device.   The said 2nd capacitor | condenser is distribute | arranged in order of the said 2nd back heat radiating part and the said 2nd front heat radiating part seeing from the flow direction of the refrigerant | coolant of the said refrigerating cycle. Waste heat utilization device for internal combustion engines.   The waste heat utilization apparatus for an internal combustion engine according to claim 4, wherein the radiator has a heat radiation area smaller than any one of the first and second capacitors. An exhaust gas heat exchanger for further heating the refrigerant heated by the cooling water with the exhaust gas of the internal combustion engine;
Bypass means for bypassing the exhaust gas heat exchanger and circulating refrigerant in the Rankine cycle;
Cooling water temperature detecting means for detecting the temperature of cooling water for cooling the internal combustion engine,
7. The internal combustion engine according to claim 6, wherein the exhaust gas heat exchanger is bypassed by the bypass means when the cooling water temperature detected by the cooling water temperature detection means is equal to or higher than a predetermined set temperature. Waste heat utilization equipment. First communication means for communicating the inlet of the first rear heat radiating portion and the inlet of the second rear heat radiating portion;
Second communication means for communicating the outlet of the first front heat radiating portion and the outlet of the second front heat radiating portion;
When the Rankine cycle operation is stopped, the first communication means communicates the inlet of the first rear heat radiating section and the inlet of the second rear heat radiation section, and the second communication means communicates the first front heat radiating section. 8. The internal combustion engine according to claim 2, wherein the outlet communicates with an outlet of the second front heat radiating portion, and the first and second capacitors are used in the refrigeration cycle. Waste heat utilization equipment. First communication means for communicating the inlet of the first rear heat radiating portion and the inlet of the second rear heat radiating portion;
Second communication means for communicating the outlet of the first front heat radiating portion and the outlet of the second front heat radiating portion;
When the operation of the refrigeration cycle is stopped, the inlet of the first rear heat dissipating part and the inlet of the second rear heat dissipating part are communicated by the first communicating means, and the first front heat dissipating part is communicated by the second communicating means. The internal combustion engine according to claim 2, 4, 6, 7, or 8, wherein an outlet and an outlet of the second front heat radiating portion are communicated, and the first and second capacitors are used in the Rankine cycle. Waste heat utilization equipment of the engine.   When the Rankine cycle is stopped, the inlet of the first capacitor and the inlet of the second capacitor are communicated, and the outlet of the first capacitor and the outlet of the second capacitor are communicated. The waste heat utilization apparatus for an internal combustion engine according to claim 1, wherein the second condenser is used in the refrigeration cycle.   When the operation of the refrigeration cycle is stopped, the inlet of the first capacitor and the inlet of the second capacitor are communicated, and the outlet of the first capacitor and the outlet of the second capacitor are communicated. The waste heat utilization apparatus for an internal combustion engine according to claim 1 or 10, wherein a second capacitor is used in the Rankine cycle.