JP6319009B2 - Cooling system - Google Patents

Description

  The present invention relates to a cooling device that cools a rear exhaust portion at the rear of an engine.

  According to the engine room structure of Patent Document 1, it is disclosed that a duct through which outside air blown rearward by a radiator fan at the front of a vehicle flows is arranged from the front to the rear of the engine. An exhaust manifold extending from the front portion of the engine and an exhaust pipe extending rearward from the manifold are provided in a passage inside the duct. The outside air taken into the engine room by the radiator fan flows backward in the duct, and can contact the exhaust manifold and the exhaust pipe to cool them.

Japanese Patent Laid-Open No. 05-169986

  In the technique of Patent Document 1, the exhaust manifold extending from the front portion of the engine is cooled using air blown rearward by a radiator fan, so that the hot air heat-exchanged by the exhaust manifold on the front side of the engine is transferred to the rear surface of the engine. Suppresses wraparound. As described above, the technique disclosed in Patent Document 1 cannot sufficiently cool the exhaust manifold at the rear of the engine that constitutes the rear exhaust that exhausts from the rear of the engine, the exhaust pipe that extends rearward from the manifold, and the like. . In particular, efficient cooling of the rear exhaust portion of a rear exhaust type engine is an important technical issue, and further improvement is required.

  Therefore, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a cooling device capable of efficiently exhausting a rear exhaust part through which exhaust flows from the rear part of an engine.

  The present invention employs the following technical means to achieve the above object. It should be noted that the reference numerals in parentheses described in the claims and in this section are examples showing the correspondence with the specific means described in the embodiments described later as one aspect, and the technical scope of the present invention is as follows. It is not limited.

One of the inventions related to the disclosed cooling device includes an engine (2) that is mounted on a vehicle and has a rear exhaust part (20, 21) that constitutes an exhaust passage through which exhaust flows from the rear of the engine toward the rear, An outside air introduction passage (31) provided near the rear of the engine so as to allow the outside air taken in from the outside of the vehicle to flow toward the rear exhaust part. And the passage opening and closing device (3) that can be controlled to be open and closed to allow air flow in the outside air introduction passage, and the vehicle air conditioner (1) for air conditioning the vehicle interior. The conditioned air introduction passage (11) provided to allow the conditioned air to flow from the rear toward the rear exhaust part from the engine, and the control of the operation of the vehicle air conditioner and the operation of the passage opening / closing device. Apparatus (100) comprises a,
The control device controls the operation of the vehicle air conditioner so that the cool air cooled in the vehicle air conditioner flows into the conditioned air introduction passage while the passage opening and closing device is controlled to be open while the vehicle is stopped. To do.

  According to the present invention, by introducing the outside air into the outside air introduction passage set near the rear part of the engine, it is possible to reduce the ventilation resistance when the outside air flows in and smoothly take it into the engine room. Furthermore, since the outside air that has flowed into the outside air introduction passage flows toward the rear exhaust portion, fresh outside air having a high cooling effect can be brought into contact with the rear exhaust portion before absorbing heat from another heat source in the engine room. Thereby, it is possible to remarkably enhance the effect of cooling the rear exhaust part by the outside air. For example, when the vehicle is running, by opening the passage opening and closing device, outside air can flow from outside the vehicle through the outside air introduction passage toward the rear exhaust section, so that the exhaust manifold and exhaust pipe of the rear exhaust type engine are cooled. The ability to do can be improved by the outside air.

  As described above, according to the present invention, it is possible to provide a cooling device that can efficiently exhaust the rear exhaust part through which exhaust flows from the rear part of the engine.

It is 1st Embodiment which is an example of the cooling device which concerns on this invention, and is drawing which showed the state which introduces external air at the time of driving | running | working. In 1st Embodiment, it is drawing which showed the state which does not introduce external air at the time of driving | running | working. In 1st Embodiment, it is drawing which showed the state which introduces external air at the time of a stop. It is a block diagram regarding control of the cooling device in a 1st embodiment. It is a flowchart regarding the control which the cooling device of 1st Embodiment performs. In 2nd Embodiment, it is drawing which showed the state which introduces external air at the time of a stop. It is a block diagram regarding control of the cooling device in 2nd Embodiment. It is a flowchart regarding the control which the cooling device of 2nd Embodiment performs.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. In addition to combinations of parts that clearly indicate that each embodiment can be combined specifically, the embodiments may be partially combined even if they are not clearly specified, unless there is a problem with the combination. Is possible.

(First embodiment)
The cooling device according to the first embodiment of the disclosed invention is a device that can efficiently cool a rear exhaust portion, which is a portion in which exhaust flows from the rear of the engine toward the rear, in the engine 2 that provides power for vehicle travel. is there. The rear exhaust part to be cooled is an exhaust passage connected to the rear part of the engine 2. The rear exhaust unit includes, for example, a manifold exhaust manifold 20 from which exhaust flows out rearward from the rear of the engine, and an exhaust pipe 21 connected to the exhaust manifold 20 and extending rearward.

  The cooling device according to the first embodiment will be described with reference to FIGS. The engine room 4 of the vehicle accommodates the engine 2 surrounded by a front front grill 41, a side hood ridge panel, an upper engine hood 40 (or bonnet), a lower under cover 45, a rear firewall 47, and the like. It is space. The under cover 45 extends from the lower part of the front grill 41 to the vicinity of the firewall 47 in the rear of the vehicle. The firewall 47 constitutes a partition panel between the engine room 4 and the driver's seat.

  For example, the floor panel 46 is integrally provided in the firewall 47. The floor panel 46 constitutes the bottom of the vehicle below the vehicle interior 5. The under cover 45, the firewall 47, and the floor panel 46 are provided over the entire vehicle width. A gap between the under cover 45 and the floor panel 46 constitutes an opening for discharging outside air through which outside air taken in from the outside of the vehicle is discharged from the engine room 4 in order to cool the above-described rear exhaust portion.

  A cooling module fixed to a vehicle frame or the like is provided in front of the engine 2 which is a front portion of the engine room 4. The cooling module performs cooling of the condenser 42 used in the air conditioner 1 and cooling of the radiator 43 that cools the cooling water of the engine 2 by forced air blowing by a common electric fan 44. The cooling module employs a series arrangement in which the capacitor 42 is disposed on the front surface of the radiator 43. The capacitor 42 is fixed to the body of the radiator 43 via a rubber mount. The electric fan 44 has a fan shroud, and is fixed to the radiator 43 integrally behind the radiator 43.

  The engine 2 has at least an exhaust manifold 20 that performs exhaust from its rear part. Connected to the exhaust manifold 20 is an exhaust pipe 21 that extends downward in the vicinity of the firewall 47 at the rear of the engine room 4. The exhaust pipe 21 extends to the rear of the vehicle along the floor panel 46, and the exhaust is discharged out of the vehicle through an opening end integrated with a bumper at the rear of the vehicle. The exhaust manifold 20 and the exhaust pipe 21 are also called the exhaust pipe of the engine 2 through which the exhaust gas flowing out from the engine 2 flows. The rear exhaust part to be cooled by the cooling device includes at least one of the exhaust manifold 20 and the exhaust pipe 21.

  The outside air sucked from the front grill 41 by the electric fan 44 passes through the heat exchange core portion of the condenser 42 and the heat exchange core portion of the radiator 43 in this order, and flows to the front side of the engine 2. This outside air contacts the front part of the engine 2 and cools it, and then also contacts the rear side of the engine 2, and the outside of the engine room 4 from the above opening due to the gap between the under cover 45 and the floor panel 46. To be discharged.

  Thus, since the outside air introduced into the engine room 4 by the electric fan 44 can also contact the rear exhaust part provided on the rear side of the engine 2, the rear exhaust part can be cooled. However, in addition to cooling the condenser 42 and the radiator 43, this outside air flow absorbs the heat of the front part of the engine 2, so that the effect of cooling the rear exhaust part is small. Furthermore, since the outside air flow finally reaches the rear exhaust part after contacting the condenser 42, the radiator 43, the front part of the engine 2, etc., the ventilation resistance to the rear exhaust part is large. The rear exhaust cannot be cooled sufficiently.

  Next, the cooling device according to the first embodiment capable of efficiently cooling the rear exhaust part will be described. The cooling device includes an outside air introduction passage 31 that communicates between the outside of the vehicle and the engine room 4 where the engine is installed. As shown in FIG. 1, the outside air introduction passage 31 is provided near the rear part of the engine 2 so that outside air taken in from the outside of the vehicle flows toward the rear exhaust part. The outside air introduction passage 31 is configured to allow the outside air taken in from the outside air introduction port 30 to come into contact with the rear exhaust portion and be discharged outside the vehicle through the outside air discharge opening formed by the gap between the under cover 45 and the floor panel 46. It is a passage through.

  The outside air introduction passage 31 is provided at a position closer to the rear surface (or the rear surface) than the front surface of the engine 2 in the longitudinal direction of the vehicle. Therefore, the outside air introduction passage 31 is provided so as to pass through a position included in at least one of the range from the center of the engine 2 to the rear surface and the range located behind the rear surface of the engine 2 in the longitudinal direction of the vehicle. It is done. For example, the outside air introduction passage 31 constitutes a passage including the periphery of the rear exhaust part of the engine 2. As described above, since the outside air introduction passage 31 is configured, outside air taken in from the outside of the vehicle flows toward the rear exhaust part.

  The outside air introduction port 30 through which outside air is taken from outside the vehicle in the outside air introduction passage 31 preferably takes outside air from outside the vehicle at a position higher than the engine 2. Further, it is preferable that the outside air introduction port 30 takes outside air from outside the vehicle at a position behind the engine 2. Furthermore, the outside air introduction passage 31 is preferably a passage for taking in outside air from directly above the rear exhaust part. The outside air flowing in from the outside air introduction port 30 is guided by the guide wall 31a and the firewall 47 provided in the engine room 4 to the flow of the outside air in the engine room 4. The outside air introduction passage 31 is formed in accordance with the flow thus guided.

  The outside air introduction port 30 of the outside air introduction passage 31 is provided in the cowl. The cowl is an outer plate portion provided between the engine hood 40 (or bonnet) and the front windshield 51. Further, the outer plate portion is provided with an air inlet of a vehicle air conditioner for taking outside air into the air conditioning case in the outside air mode of the air conditioning operation.

  The cooling device includes a first door 3 that is an example of a passage opening and closing device that can be controlled in an open state that allows air to flow in the outside air introduction passage 31 and a closed state that blocks air flow. The first door 3 is a device that includes one or a plurality of door bodies that are provided in the outside air introduction passage 31 and open and close the outside air introduction passage 31. 1 to 3 disclose a first door 3 having three door bodies as an example.

  The cooling device can control the first door 3 and the vehicle air conditioner 1 that blows conditioned air whose temperature is adjusted with respect to the passenger compartment. The air conditioner 1 is provided with a duct 10 that communicates the inside of the air conditioning case of the air conditioner 1 and the engine room 4. The duct 10 constitutes the conditioned air introduction passage 11. The duct 10 is provided so as to penetrate the firewall 47, and an opening end portion thereof opens toward the exhaust manifold 20 and the exhaust pipe 21. Therefore, the conditioned air introduction passage 11 constitutes a passage through which conditioned air flows into the engine room 4 from a position behind the engine 2 toward the rear exhaust part.

  Inside the duct 10, there is provided a second door 12, which is an example of a passage opening / closing device capable of controlling the conditioned air introduction passage 11 in an open state and a closed state. The second door 12 allows the conditioned air conditioned by the air conditioner 1 to flow into the engine room 4 when controlled to the open state. When the second door 12 is controlled to be in a closed state, the second door 12 prevents air from flowing through the conditioned air introduction passage 11 and prohibits the flow of conditioned air into the engine room 4. The air conditioner 1 is set to the engine room blowing mode when allowing the conditioned air to flow into the engine room 4. In this engine room blowing mode, the second door 12 is controlled to be in an open state, and all or part of the conditioned air blown by the indoor blower 14 of the air conditioner 1 passes through the conditioned air introduction passage 11 to the rear exhaust part. The air is blown out into the engine room 4.

  A structure is demonstrated regarding the control relevant to a cooling device. The operation of the first door 3 is controlled by the cooling ECU 100. The cooling ECU 100 controls the rotational position of the door body of the first door 3 by controlling the voltage value applied to the motor that drives the rotating shaft portion of the first door 3, and the opening degree of the outside air introduction passage 31. To control. Therefore, the cooling ECU 100 can vary the amount of outside air flowing into the outside air introduction passage 31. The ability to cool the rear exhaust part is adjusted by controlling the opening degree of the first door 3 by the cooling ECU 100.

  The cooling ECU 100 is supplied with DC power from a battery 7 that is an in-vehicle power source mounted on the vehicle, regardless of whether an ignition switch that controls starting and stopping of the engine is on or off, and performs predetermined arithmetic processing and control processing. It is configured as follows. The cooling ECU 100 can supply electric power obtained from the battery 7 to the first door 3 and control the supplied electric power. The cooling ECU 100 can control the rotational position of the door body of the first door 3 by controlling the supplied power.

  The battery 7 may be composed of, for example, an assembled battery made up of an assembly of a plurality of single cells. Each unit cell can be composed of, for example, a nickel-hydrogen secondary battery, a lithium ion secondary battery, or an organic radical battery. For example, in the case of a vehicle that is chargeable / dischargeable and has a motor for traveling the vehicle, the battery 7 can be used for the purpose of supplying electric power to the motor.

  The cooling ECU 100 includes a microcomputer that includes functions such as a CPU (central processing unit) that performs arithmetic processing and control processing, a memory such as a ROM and a RAM, and an I / O port (input / output circuit). ing. The air conditioning ECU 200 can supply power obtained from the battery 7 to each air conditioning functional component of the air conditioner 1 and control the supplied power.

  Memory such as ROM and RAM constitutes storage means of the cooling ECU 100. The storage means stores in advance a predetermined calculation program, predetermined control characteristic data, and the like used for the cooling operation of the rear exhaust section. These programs and the like are used for controlling the cooling operation of the rear exhaust unit by the cooling ECU 100. In addition, the cooling ECU 100 performs a cooling operation for cooling the rear exhaust unit associated with the operation of the air conditioner 1 by communicating with the air conditioning ECU 200.

  The occupant can set the temperature (set temperature) in the passenger compartment by operating an air conditioning operation unit installed in the instrument panel 50 or the like. When the air conditioning operation unit is operated and a command signal for performing an automatic air conditioning operation is input to the air conditioning ECU 200, the air conditioning ECU 200 controls the automatic air conditioning operation by the air conditioner 1, and brings the vehicle interior temperature close to the set temperature. . The air conditioning ECU 200 controls the operation of each air conditioning functional component of the air conditioner 1 by controlling the power supplied from the battery 7 to perform an automatic air conditioning operation.

  The outside air temperature sensor 15 has a temperature detector that detects the outside air temperature Tam as an electric signal in contact with air outside the vehicle, and transmits the electric signal detected by the temperature detector to the air conditioning ECU 200. The inside air temperature sensor 16 has a temperature detection unit that detects the vehicle interior temperature Tr as an electrical signal in contact with the air in the vehicle interior 5, and transmits the electrical signal detected by the temperature detection unit to the air conditioning ECU 200. Signals from the outside air temperature sensor 15 and the inside air temperature sensor 16 are A / D converted by, for example, an I / O port or an A / D conversion circuit, and then input to the microcomputer.

  The communication form between the cooling ECU 100 and the air conditioning ECU 200 may be wired or wireless. The air conditioning ECU 200 is an air conditioning control device that includes a microcomputer such as a CPU, a ROM, and a RAM, and peripheral circuits thereof, and is supplied with a DC power from the battery 7 to control air conditioning in the vehicle interior. In the air conditioning ECU 200, in addition to the outside air temperature sensor 15 and the inside air temperature sensor 16 described above, each detection signal of a sensor group for air conditioning control such as a solar radiation sensor, a discharge temperature sensor, a discharge pressure sensor, an evaporator temperature sensor, and a set temperature. Signal is input.

  The solar radiation sensor detects the solar radiation amount Ts in the vehicle interior 5. The discharge temperature sensor detects the discharge refrigerant temperature Td of the compressor in the air-conditioning refrigeration cycle. The discharge pressure sensor detects the discharge refrigerant pressure Pd of the compressor. The evaporator temperature sensor detects the temperature of air blown from the evaporator (evaporator temperature) Te in the air-conditioning refrigeration cycle. The air conditioning ECU 200 includes a humidity sensor that detects the relative humidity of the air in the vehicle interior near the window glass in the vehicle interior, a temperature sensor near the window that detects the temperature of the air in the vehicle interior near the window, and a window that detects the window surface temperature. A signal from a surface temperature sensor or the like is input. In addition, the cooling water temperature Tw is input to the air conditioning ECU 200 via the vehicle ECU 300.

  The air conditioning ECU 200 performs various calculations and processes using these detection signals and the stored air conditioning control program, and operates an actuator for each mode door, a motor drive circuit for a blower motor, a capacity control valve for a compressor, and a clutch drive for an electromagnetic clutch. A control signal is output to a circuit or the like. Memory such as ROM and RAM constitutes storage means of the air conditioning ECU 200. The storage means stores in advance predetermined control characteristic data that is a basis of a predetermined air conditioning control program and various control characteristic graphs. The control characteristic data is used for air conditioning control of the vehicle interior 5 by the air conditioning ECU 200.

  The air-conditioning functional parts include a compressor for an air-conditioning refrigeration cycle, an indoor blower 14, an inside / outside air switching door, an air mix door, a blow-out mode switching door, and the like. The air conditioning ECU 200 controls the operation of the second door 12 in addition to the air conditioning functional components. Air conditioning ECU 200 is configured to be able to communicate with vehicle ECU 300. Both communication forms may be wired or wireless, and the signal format is not limited. The vehicle ECU 300 acquires various types of information related to the vehicle such as the vehicle speed, the engine coolant temperature, whether or not a passenger is seated, and sends predetermined information to the air conditioning ECU 200. The air conditioning ECU 200 uses the information acquired from the vehicle ECU 300 to determine the operation of the air conditioning functional component in the air conditioning operation.

  Cooling water temperature sensor 22 has a temperature detecting unit that detects cooling water temperature Tw as an electric signal by contacting engine cooling water flowing through the engine cooling water circuit, and uses the electric signal detected by temperature detecting unit as vehicle ECU 300. Send to. The exhaust temperature sensor 23 has a temperature detection unit that detects the temperature Tex (hereinafter also referred to as the exhaust temperature Tex) of the exhaust manifold 20 as an electrical signal, and transmits the electrical signal detected by the temperature detection unit to the vehicle ECU 300. Signals from the coolant temperature sensor 22 and the exhaust temperature sensor 23 are A / D converted by, for example, an I / O port or an A / D conversion circuit, and then input to the microcomputer.

  The air conditioning ECU 200 calculates the air intake mode, the blow-out mode, the amount of air blown by the indoor blower 14, Control air conditioning temperature. The air conditioning ECU 200 sets the outside air mode, the inside air mode, or the inside / outside air introduction mode as the air intake mode. The air conditioning ECU 200 controls the position of the blowing door and sets each blowing mode. As the blowing mode, a foot blowing mode, a face blowing mode, a bi-level mode, a defroster blowing mode, a foot defroster blowing mode, an engine room blowing mode, and the like can be set.

  Next, the cooling operation of the rear exhaust unit by the cooling device and the operation of the air conditioner 1 related to the cooling operation will be described with reference to FIGS. 1 to 3 and FIG. 5. FIG. 1 shows the state of each part when the outside air is introduced during traveling in the cooling operation. FIG. 2 shows a state of each part when outside air is not introduced during traveling. In FIG. 3, the state of each part when air-conditioning air is introduce | transduced by the air conditioner 1 at the time of a stop in cooling operation is shown.

  FIG. 5 shows a flowchart disclosing a control processing procedure related to the cooling operation. This flowchart is started when the cooling ECU 100 and the air conditioning ECU 200 are powered on, and is mainly executed by the cooling ECU 100 when the cooling ECU 100 and the air conditioning ECU 200 communicate information with each other. This flowchart is repeatedly performed at predetermined time intervals. That is, when this flowchart is finished, the processing after step 10 is executed again after a predetermined time has elapsed.

  When this flowchart is started, it is first determined in step 10 whether or not the vehicle is running. In step 10, the cooling ECU 100 performs the determination based on the current vehicle speed information acquired from the vehicle ECU 300. If it is determined in step 10 that the vehicle is traveling based on the vehicle speed information, then in step 20, it is determined whether or not the coolant temperature Tw detected by the coolant temperature sensor 22 exceeds a predetermined temperature, for example, 90 ° C. To do.

  If it is determined in step 20 that Tw does not exceed 90 ° C., the temperature of the engine 2 is not high, so the conditions for cooling the rear exhaust part are not satisfied. And it progresses to step 50, the process which controls the 1st door 3 to a closed state is performed, and this flowchart is complete | finished. In this case, the outside air does not flow into the outside air introduction passage 31, and the rear exhaust part is not cooled (see FIG. 2).

  If it is determined in step 10 that Tw exceeds 90 ° C., it is determined in next step 30 whether or not the temperature of the exhaust manifold 20 (exhaust temperature Tex) exceeds a predetermined temperature, for example, 500 ° C. If it is determined in step 30 that Tex does not exceed 500 ° C., the cooling water temperature Tw is high, but the exhaust temperature Tex is not high, so the conditions for cooling the rear exhaust part are not satisfied. Also in this case, the process proceeds to step 50, the process of controlling the first door 3 to the closed state is executed, and this flowchart is ended without cooling the rear exhaust part.

  If it is determined in step 30 that Tex exceeds 500 ° C., the cooling water temperature Tw and the exhaust temperature Tex are high, so the conditions for cooling the rear exhaust part are satisfied. In this case, it progresses to step 40, the process which controls the 1st door 3 to an open state is performed, a back exhaust part is cooled, and this flowchart is complete | finished. The state of each part and the outside air introduction path at this time are as shown in FIG.

  During traveling, the air pressure in the vicinity of the under cover 45 and the floor panel 46 becomes a negative pressure area between the vehicle and the ground, for example, as indicated by a broken line A1 in FIG. On the other hand, the pressure of the air between the front part of the under cover 45 and the ground, in the vicinity of the front grille 41 (the front part of the vehicle) and in the vicinity of the rear part of the engine hood 40 (or the hood) is shown in FIG. As indicated by a dashed line A4, a positive pressure area is obtained. 1 is an area where the pressure distribution on the surface of the vehicle body is negative. For this reason, the air flows vigorously toward the front windshield 51 side near the front portion of the vehicle, for example, near the front grille 41. A smooth air flow on the surface of the vehicle body can be formed by the vehicle body shape closely related to the Cd value (drag coefficient) of the vehicle.

  During traveling, the air pressure distribution as described above is formed in the vehicle body around the engine room 4, so that an outside air flow is generated on the hood above the engine room 4 toward the front windshield 51. Due to the generation of this air flow, the outside air flows from the front of the vehicle to the cowl on the hood as shown by the solid line arrow in FIG. 1, and enters the outside air introduction passage 31 from the outside air inlet 30 opened by the first door 3. Inflow. When the outside air flowing into the outside air introduction passage 31 flows downward through the outside air introduction passage 31, the outside air passes through the periphery of the exhaust manifold 20 and the exhaust pipe 21, and absorbs heat from the rear exhaust portion by contacting these outer surfaces. Cooling. The outside air that has absorbed heat is discharged to the outside of the vehicle through an outside air discharge opening formed by the gap between the under cover 45 and the floor panel 46, so that the heat of the rear exhaust is released to the outside of the vehicle.

  If it is determined in step 10 that the vehicle is stopped based on the vehicle speed information, it is next determined in step 100 whether or not the temperature of the exhaust manifold 20 (exhaust temperature Tex) exceeds a predetermined temperature, for example, 500 ° C. If it is determined in step 100 that Tex does not exceed 500 ° C., the exhaust temperature Tex while the vehicle is stopped is not high, and therefore the condition for cooling the rear exhaust part is not satisfied. Also in this case, the process proceeds to step 50, the process of controlling the first door 3 to the closed state is executed, and this flowchart is ended without cooling the rear exhaust part.

  If it is determined in step 100 that Tex exceeds 500 ° C., the exhaust temperature Tex while the vehicle is stopped is high, and therefore the condition for cooling the rear exhaust part is satisfied. Further, at step 110, it is determined whether or not the vehicle interior temperature Tr is higher than the outside air temperature Tam. If it is determined in step 110 that Tr is equal to Tam or a temperature lower than Tam, it is more efficient to cool the rear exhaust portion using the air in the vehicle compartment 5 than the outside air. Therefore, Step 120, Step 130, Step 140, and Step 150 are executed to cool the rear exhaust portion by introducing the vehicle interior air, and this flowchart is ended.

  In step 120, the first door 3 is controlled to be opened. In step 130, the air intake mode of the air conditioner 1 is controlled to be set to the inside air mode for taking in the vehicle interior air from the inside air inlet 13. In step 140, the indoor blower 14 is operated. In step 150, the second door 12 is controlled to be opened. Through these processes, all or part of the conditioned air blown by the indoor blower 14 is blown out to the engine room 4 through the conditioned air introduction passage 11 to cool the rear exhaust part. The state of each part and the outside air introduction path at this time are as shown in FIG.

  The conditioned air blown out from the conditioned air introduction passage 11 to the engine room 4 contacts the rear exhaust portion, and then flows downward and is discharged outside the vehicle through the aforementioned discharge opening. To be released. Further, since the upper outside air introduction passage 31 is open, the conditioned air can flow upward as the temperature rises after coming into contact with the rear exhaust part, and can be discharged out of the vehicle through the outside air introduction port 30. As the conditioned air flows in this way, the cooling performance for the rear exhaust part located at the top of the engine 2, for example, the exhaust manifold 20, can be improved.

  If it is determined in step 110 that Tr is higher than Tam, it is more efficient to cool the rear exhaust with outside air that is cooler than the passenger compartment temperature. For this reason, the process which controls the 1st door 3 to an open state in the following step 125 is performed, and this flowchart is complete | finished. Accordingly, by not opening the vehicle interior air into the engine room 4 but only opening the outside air introduction passage 31, the outside exhaust air flowing from the outside air introduction port 30 is used to cool the rear exhaust part. In particular, since low temperature outside air tends to flow downward, it flows down through the outside air introduction passage 31 extending downward after being introduced from the outside air inlet 30. Therefore, the low temperature outside air flows from the upper part to the lower part in the outside air introduction passage 31 and can cool the rear exhaust part more efficiently than the air in the passenger compartment.

  Next, the effect which the cooling device of 1st Embodiment brings is demonstrated. The cooling device includes an engine 2 that is mounted on a vehicle and has a rear exhaust portion that constitutes an exhaust passage through which exhaust flows from the rear of the engine toward the rear. The cooling device is a passage connecting the outside of the vehicle and the engine room 4, and an outside air introduction passage 31 provided near the rear of the engine 2 so that outside air taken in from the outside flows toward the rear exhaust portion, and outside air introduction A first door 3 capable of controlling the passage 31 in an open state and a closed state.

  According to this configuration, by introducing the outside air into the outside air introduction passage 31 set near the rear portion of the engine 2, the ventilation resistance when the outside air flows can be reduced and smoothly taken into the engine room 4. Furthermore, since the outside air that has flowed into the outside air introduction passage 31 flows toward the rear exhaust part (the exhaust manifold 20 and the exhaust pipe 21), the fresh outside air having a high cooling effect is rearward before absorbing heat from other heat sources in the engine room 4. The exhaust part can be contacted. Thereby, it is possible to remarkably enhance the effect of cooling the rear exhaust part by the outside air.

  For example, when the vehicle is running, by opening the first door 3, the outside air can flow from outside the vehicle through the outside air introduction passage 31 toward the rear exhaust part, so that the exhaust manifold 20 of the rear exhaust type engine 2 or The ability to cool the exhaust pipe 21 can be improved by outside air. In this way, a cooling device that can efficiently exhaust the rear exhaust part through which exhaust flows from the rear part of the engine 2 is obtained.

  The outside air introduction passage 31 is a passage for taking outside air from outside the vehicle at a position higher than the engine 2. According to such a configuration of the outside air introduction passage 31, the outside air introduction passage 31 extends downward from the outside air introduction port 30, and therefore, particularly when the outside air is at a low temperature, And heavy outside air easily flows down the outside air introduction passage 31. For this reason, the outside air can come into contact with the exhaust manifold 20 and the exhaust pipe 21 while smoothly flowing downward, and the outside air having a relatively high flow velocity can be brought into contact with the rear exhaust portion.

  The outside air introduction passage 31 is a passage for taking in outside air from the outside of the vehicle at a position behind the engine 2. According to such a configuration of the outside air introduction passage 31, the outside air can be positively brought into contact with the rear portion of the engine 2 rather than the front portion. Further, since the exhaust pipe 21 which is an example of the rear exhaust part is often installed so as to extend rearward of the vehicle, the outside air introduced from the rear side of the engine 2 can be brought into contact with a wide range of the exhaust pipe 21. . Thereby, it is possible to efficiently cool the rear exhaust portion extending rearward from the engine 2.

  The outside air introduction passage 31 is a passage for taking in outside air from the outside air introduction port 30 which is an opening provided between the engine hood 40 and the front windshield 51 in the vehicle. According to the configuration of the outside air introduction passage 31 as described above, it is possible to efficiently introduce outside air using the pressure distribution of the air formed around the traveling vehicle body as described above. Further, the outside air inlet 30 can be formed in an outer plate portion or the like where an outside air inlet is formed in the air conditioner 1.

  The outside air introduction passage 31 is a passage for taking in outside air from directly above the rear exhaust part. According to such a configuration of the outside air introduction passage 31, the outside air introduction passage 31 can be provided directly below the outside air introduction port 30, so that the flow rate of the outside air can be accelerated using gravity. In particular, when the outside air is at a low temperature, it is easy to further accelerate the outside air that is heavier than the air in the engine room 4. For this reason, the outside air can flow down while accelerating the outside air introduction passage 31, and the outside air having a high flow velocity can be brought into contact with the rear exhaust part.

  While the vehicle is running, the first door 3 is controlled to be in an open state, and the outside air taken in from the outside of the vehicle flows downward through the outside air introduction passage 31. According to this, the outside air inlet 30 can be positioned above the rear exhaust part. For this reason, the outside air can be taken into the outside air introduction passage 31 using the pressure distribution of the air formed around the traveling vehicle body as described above. Therefore, it is possible to efficiently introduce the outside air during traveling and to bring more outside air into contact with the rear exhaust part.

  In addition, the cooling device includes an air conditioning air introduction passage 11, and a control device that controls the operation of the air conditioning device 1 and the operation of the first door 3. The conditioned air introduction passage 11 is provided so that conditioned air conditioned in the air conditioner 1 for air-conditioning the vehicle interior 5 flows from the rear of the engine 2 toward the rear exhaust part. The control device controls the operation of the air conditioner 1 so that the cold air cooled in the air conditioner 1 flows into the conditioned air introduction passage 11 while the first door 3 is controlled to be open while the vehicle is stopped.

  According to this, even when it is difficult to take in a sufficient amount of outside air into the engine room 4 such as when stopping after high-speed traveling, it is difficult to use the pressure distribution of air formed during traveling. Can be efficiently cooled. Further, even when the conditioned air is at a lower temperature than the outside air and a high cooling effect is obtained, a more efficient cooling operation can be performed.

(Second Embodiment)
In the second embodiment, another embodiment for the control related to the cooling device and the cooling operation described in the first embodiment will be described with reference to FIGS. 6 and 7, the same reference numerals as those in FIGS. 1, 4, and the like are the same and have the same effects. In FIG. 8, steps denoted by the same step numbers as in FIG. 5 are the same processing and have the same effects. Only the contents different from the first embodiment will be described below.

  As shown in FIG. 6, the cooling device relates the first door 3, a blower 61 that blows air in the vehicle compartment to the engine room 4, and a third door 62 that can open and close the indoor air introduction passage 60. Can be controlled. FIG. 6 shows the state of each part when air is introduced into the passenger compartment when the vehicle is stopped in the cooling operation.

  The vehicle is provided with a duct 6 that communicates between the vehicle compartment 5 and the engine room 4. The duct 6 constitutes an indoor air introduction passage 60. The duct 6 is provided so as to penetrate the lower part of the instrument panel 50 and the firewall 47, and an opening end portion located in the engine room 4 opens toward the exhaust manifold 20 and the exhaust pipe 21. Therefore, the indoor air introduction passage 60 constitutes a passage through which the vehicle interior air flows into the engine room 4 from a position behind the engine 2 toward the rear exhaust part.

  Inside the duct 6 is provided a third door 62 which is an example of a passage opening / closing device capable of controlling the indoor air introduction passage 60 in an open state and a closed state. The third door 62 is a dedicated device provided for the cooling operation, and allows the air in the passenger compartment to flow into the engine room 4 when controlled to the open state. When the third door 62 is controlled to be closed, the third door 62 prevents air from flowing through the indoor air introduction passage 60 and prohibits inflow of vehicle interior air into the engine room 4. Inside the duct 6 is provided a blower 61 that blows vehicle interior air toward the engine room 4. The blower device 61 is a dedicated device provided for the cooling operation, and allows the air in the vehicle compartment to flow into the engine room 4 when the third door 62 is controlled to be in the open state.

  The operation of the third door 62 and the blower 61 is controlled by the cooling ECU 100. The cooling ECU 100 controls the rotational position of the door body of the third door 62 by controlling the voltage value applied to the motor that drives the rotating shaft of the third door 62, thereby opening the indoor air introduction passage 60. Control the degree. Therefore, the cooling ECU 100 can vary the air volume of the room air flowing into the room air introduction passage 60. The ability to cool the rear exhaust part is adjusted by the opening degree control of the third door 62 by the cooling ECU 100 and the air volume control by the blower 61.

  Next, the cooling operation of the rear exhaust unit by the cooling device and the operation of the blower 61 and the third door 62 related to the cooling operation will be described with reference to FIGS. 6 and 8.

  FIG. 8 shows a flowchart disclosing the control processing procedure related to the cooling operation. Steps 10, 20, 3040, 50, 100, and 110 in this flowchart are the same as the processes described in the first embodiment.

  If it is determined in step 100 that Tex exceeds 500 ° C., it is next determined in step 110 whether the vehicle interior temperature Tr is higher than the outside air temperature Tam. If it is determined in step 110 that Tr is equal to Tam or a temperature lower than Tam, it is more efficient to cool the rear exhaust portion using the air in the vehicle compartment 5 than the outside air. Therefore, Step 200, Step 210, and Step 220 are executed to cool the rear exhaust portion by introducing the vehicle interior air, and this flowchart is finished.

  In step 200, the first door 3 is controlled to be opened. In step 210, the blower 61 is operated. In step 220, the third door 62 is controlled to be opened. Through these processes, all of the passenger compartment air blown by the blower 61 is blown out to the engine room 4 via the indoor air introduction passage 60 to cool the rear exhaust part. The state of each part and the outside air introduction path at this time are as shown in FIG.

  After the vehicle interior air blown out from the indoor air introduction passage 60 to the engine room 4 contacts the rear exhaust portion, the vehicle interior air flows downward and is discharged out of the vehicle through the aforementioned discharge opening. Released outside the car. Further, since the upper outside air introduction passage 31 is open, the vehicle interior air can flow upward as the temperature rises after coming into contact with the rear exhaust portion, and can be discharged from the outside air introduction port 30 to the outside.

  If it is determined in step 110 that Tr is higher than Tam, in the next step 205, processing for controlling the first door 3 to the open state is executed, and this flowchart is ended. Therefore, for the same reason as described in the first embodiment, the low-temperature outside air can flow from the top to the bottom in the outside air introduction passage 31 and cool the rear exhaust part more efficiently than the air in the passenger compartment. Further, since the upper outside air introduction passage 31 is open, the vehicle interior air can flow upward as the temperature rises after coming into contact with the rear exhaust portion, and can be discharged from the outside air introduction port 30 to the outside. As described above, the vehicle interior air flows upward, so that it is possible to improve the cooling performance with respect to the rear exhaust part, for example, the exhaust manifold 20, located at the upper part of the engine 2.

  Next, the effect which the cooling device of 2nd Embodiment brings is demonstrated. The cooling device includes an indoor air introduction passage 60 that allows the vehicle interior air to flow from the rear toward the rear exhaust portion of the engine 2, a blower device 61 that causes the air in the vehicle interior to flow through the indoor air introduction passage 60, and the first door 3. And a control device for controlling the operation of the blower 61. The control device controls the operation of the blower 61 so that the vehicle interior air flows through the indoor air introduction passage 60 while the first door 3 is controlled to be open while the vehicle is stopped.

  According to this, even when it is difficult to take in a sufficient amount of outside air into the engine room 4, such as when stopping after high-speed driving (at the time of dead soak), the pressure distribution of air formed during driving cannot be used. A cooling device capable of efficiently cooling the rear exhaust part can be provided. Further, when the passenger compartment air is at a lower temperature than the outside air and a high cooling effect is obtained, a more efficient cooling operation can be performed.

  In addition, when the temperature of the outside air is lower than the temperature of the vehicle interior air while the vehicle is stopped, the control device controls the first door 3 to be in an open state and controls the blower 61 to stop. According to this, an efficient cooling operation can be realized by positively introducing the outside air without introducing the vehicle interior air having a temperature higher than that of the outside air into the engine room 4.

  Furthermore, when the outside air introduction port 30 is provided at a position higher than the engine 2, when the outside air introduction passage 31 takes in outside air from directly above the rear exhaust part, or when the outside air introduction port 30 is provided in the cowl. In this case, the following effects can be obtained. That is, since the outside air having a low temperature flows from the upper part to the lower part of the outside air introduction passage 31, the rear exhaust part can be cooled more efficiently than the case where the vehicle interior air is introduced, and electric power for blowing air is required. This also saves energy.

(Other embodiments)
The preferred embodiments of the disclosed invention have been described above, but the disclosed invention is not limited to the above-described embodiments, and various modifications can be made. The structure of the above-described embodiment is merely an example, and the technical scope of the disclosed invention is not limited to the scope of these descriptions. The technical scope of the disclosed invention is indicated by the description of the scope of claims, and further includes all modifications within the meaning and scope equivalent to the description of the scope of claims.

  In the above-described embodiment, the engine 2 has the exhaust manifold 20 from which exhaust flows out from the rear, but may further be configured to have an exhaust manifold from which exhaust flows out from the front. That is, the engine having the rear exhaust part cooled by the cooling device according to the present invention may have a configuration in which exhaust gas is discharged from the front part in addition to the rear part.

  In the above-described embodiment, the cooling ECU 100 that controls the operation of the first door 3 and the air conditioning ECU 200 that controls the operation of the air conditioner 1 cooperate to control the operation of the cooling device. . Control of a cooling device is not limited to the form comprised by several ECUs which communicate with each other in this way. For example, the operation of the cooling device may be controlled by a single control device that controls the operation of both the first door 3 and the air conditioner 1, that is, the system control device. The single control device may be the air conditioning ECU 200.

  The first door 3 in the above-described embodiment is a passage opening / closing device that is controlled to be switched between an open state and a closed state when the door body is rotationally driven, but is not limited to such a drive mode. For example, the first door 3 may be a device configured to open and close the outside air introduction passage 31 by sliding the door body.

  In the above-described embodiment, the cooling water temperature Tw is input to the air conditioning ECU 200 via the vehicle ECU 300. However, the cooling water temperature Tw may be directly input to the air conditioning ECU 200 without passing through the vehicle ECU 300.

2 ... Engine 3 ... First door (passage opening / closing device)
4 ... Engine room 20 ... Exhaust manifold (rear exhaust part)
21 ... Exhaust pipe (rear exhaust part)
31 ... outside air introduction passage

Claims (8)

An engine (2) mounted on a vehicle and having a rear exhaust part (20, 21) constituting an exhaust passage through which exhaust flows from the rear part of the engine toward the rear;
A passage connecting the outside of the vehicle and the engine room (4) in which the engine is installed, provided near the rear of the engine so that outside air taken in from the outside flows into the rear exhaust portion. An outside air introduction passage (31);
A passage opening and closing device (3) that is controllable to an open state that allows air flow in the outside air introduction passage and a closed state that blocks air flow;
A conditioned air introduction passage (11) provided so as to allow the conditioned air conditioned in the vehicle air conditioner (1) for air-conditioning the vehicle interior to flow from the rear toward the rear exhaust part from the engine; ,
A control device (100) for controlling the operation of the vehicle air conditioner and the operation of the passage opening and closing device;
Equipped with a,
The control device controls the passage opening and closing device to the open state while the vehicle is stopped, and operates the vehicle air conditioning device so that the cool air cooled in the vehicle air conditioning device flows through the conditioned air introduction passage. A cooling device characterized by controlling . An engine (2) mounted on a vehicle and having a rear exhaust part (20, 21) constituting an exhaust passage through which exhaust flows from the rear part of the engine toward the rear;
A passage connecting the outside of the vehicle and the engine room (4) in which the engine is installed, provided near the rear of the engine so that outside air taken in from the outside flows into the rear exhaust portion. An outside air introduction passage (31);
A passage opening and closing device (3) that is controllable to an open state that allows air flow in the outside air introduction passage and a closed state that blocks air flow;
Indoor air introduction passages (11, 60) provided so as to allow air in the vehicle compartment to flow from the rear toward the rear exhaust part from the engine;
A blower (61) for flowing the air in the vehicle interior to the indoor air introduction passage;
A control device (100) for controlling the operation of the passage opening and closing device and the operation of the blower;
With
The control device controls the operation of the blower so as to flow the air in the passenger compartment to the indoor air introduction passage while controlling the passage opening and closing device to the open state while the vehicle is stopped. apparatus. When the outside air temperature is lower than the temperature of the air in the passenger compartment while the vehicle is stopped, the control device controls the passage opening / closing device to the open state and controls the air blower to stop. The cooling device according to claim 2, wherein The cooling device according to any one of claims 1 to 3, wherein the outside air introduction passage is a passage for taking in the outside air from the outside of the vehicle at a position higher than the engine . The cooling device according to claim 4 , wherein the outside air introduction passage is a passage for taking in the outside air from the outside of the vehicle at a position behind the engine . 6. The outside air introduction passage is a passage for taking in the outside air from an opening (30) provided between an engine hood (40) and a front windshield (51) in the vehicle. The cooling device as described. The cooling device according to claim 5 or 6, wherein the outside air introduction passage is a passage for taking in the outside air from directly above the rear exhaust portion . 8. The passage opening and closing device is controlled to be in the open state while the vehicle is running, and the outside air taken from outside the vehicle flows downward in the outside air introduction passage . The cooling device according to any one of the above.

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