JP2019203421A - Ventilation device - Google Patents

Abstract

To provide a ventilation device capable of preventing frost formation near an outlet of intake air in an intercooler.SOLUTION: An intake device 37 includes an intake passage 8 connected to a diesel engine 2 to allow intake air to flow therein, and an intercooler 16 disposed in the intake passage 8. The intercooler 16 has an intake air circulation portion 26 through which the intake air passes, and a cooling air circulation portion 27 in which air for cooling the intake air flowing in the intake air circulation portion 26, passes. A part at an outlet side, of the intake air in the intercooler 16 is provided with hot water piping 30 in which engine cooling water after cooling the diesel engine 2 flows to heat the intake air flowing in the intake air circulation portion 26.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an intake device.

  As a conventional intake device, for example, a technique described in Patent Document 1 is known. An intake apparatus described in Patent Document 1 is connected to an intake manifold of an engine, and an intake passage for sending intake air necessary for combustion in the engine to the engine, a compressor of a supercharger provided in the intake passage, An intercooler that is provided on the engine side of the compressor in the passage and heat-exchanges between the intake air compressed by the compressor and the temperature rising and the atmosphere.

JP-A-2018-59476

  However, the following problems exist in the prior art. That is, when the temperature near the outlet of intake air (intake air) in the intercooler becomes 0 ° C. or lower during vehicle travel, frost is generated near the outlet of intake air in the intercooler. Thereafter, when the vehicle moves to a place where the outside air temperature is higher than 0 ° C., such as an indoor parking lot, frost near the outlet of the intake air in the intercooler melts and a large amount of water accumulates in the intercooler. When the water enters the engine, problems such as rough idols occur.

  The objective of this invention is providing the intake device which can prevent that frost generate | occur | produces near the exit of the intake air in an intercooler.

  An intake device according to an aspect of the present invention includes an intake passage that is connected to an engine and through which intake air flows, and an intercooler that is disposed in the intake passage. The intercooler includes an intake air circulation unit through which the intake air passes. A cooling air circulation portion through which cooling air that cools the intake air flowing through the intake air circulation portion passes, and the intake air flowing through the intake air circulation portion is heated at a portion on the outlet side of the intake air in the intercooler A hot water pipe through which engine cooling water after cooling the engine flows is attached.

  In such an intake device, warm engine cooling water after cooling the engine so as to heat the intake air flowing through the intake air circulation portion is connected to a hot water pipe attached to a portion of the intercooler on the outlet side of the intake air. Flowing. Accordingly, since the temperature near the intake air outlet in the intercooler is unlikely to be below the freezing point, frost is prevented from being generated near the intake air outlet in the intercooler.

  The intercooler has an inlet header that introduces intake air into the intake air circulation portion, and an outlet header that extracts intake air from the intake air circulation portion, and the intake air circulation portion and the cooling between the inlet header and the outlet header. The air circulation section is alternately stacked, and the hot water pipe is attached to extend in the stacking direction of the intake air circulation section and the cooling air circulation section at a portion on the outlet side of the intake air on the side surface of the intercooler. Also good. In such a configuration, the temperature in the vicinity of the outlet header of the intake air circulation unit and the temperature of the outlet header are unlikely to be below the freezing point, so that frost is prevented from being generated in the vicinity of the outlet header and the outlet header of the intake air circulation unit. .

  The intake device includes a first pipe that connects one end of the hot water pipe and a portion between the engine and the radiator in the circulation path for circulating the engine coolant, and a downstream end of the radiator in the other end of the hot water pipe and the circulation path. You may provide the 2nd piping which connects. In such a configuration, the engine cooling water immediately after passing through the engine is supplied to the hot water pipe through the first pipe, so that the engine cooling water that is hot water surely flows through the hot water pipe.

  The intake device opens and closes the on-off valve when the outside air temperature detected by the detecting unit is below the freezing point and cools the engine to the hot water pipe when the outside air temperature detected by the detecting unit is below the freezing point. You may provide the control part which controls so that water may flow. In such a configuration, when the outside air temperature is below the freezing point, the on-off valve opens, so that the engine coolant flows through the hot water piping, and when the outside air temperature is not below the freezing point, the on-off valve closes. Engine cooling water does not flow through hot water piping. Therefore, in the state where the outside air temperature is higher than the freezing point, the cooling efficiency of the intake air by the cooling air is not affected.

  According to the present invention, it is possible to prevent frost from being generated near the outlet of the intake air in the intercooler.

It is a schematic structure figure showing an engine system provided with an air intake device concerning one embodiment of the present invention. It is a figure which shows the side view of an intercooler with a compressor and an air cleaner. It is a top view of an intercooler. It is a block diagram which shows the engine-cooling-water circulation system containing a part of intake device which concerns on one Embodiment of this invention. It is an enlarged side view which shows the state which the frost generate | occur | produced in the intercooler. It is a block diagram which shows the engine-cooling-water circulation system containing a part of intake device which concerns on other embodiment of this invention. It is a flowchart which shows the procedure of the on-off valve control process performed by ECU.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic configuration diagram illustrating an engine system including an intake device according to an embodiment of the present invention. In the figure, the engine system 1 includes a diesel engine 2. The diesel engine 2 is a four-cylinder in-line engine. The diesel engine 2 has four cylinders 3. Each cylinder 3 is provided with a combustion chamber 4.

  The engine system 1 also includes four injectors 5 that inject fuel into each combustion chamber 4, and a common rail 6 that supplies high-pressure fuel to each injector 5.

  The engine system 1 also includes an intake passage 8 connected to the diesel engine 2 via an intake manifold 7 and an exhaust passage 10 connected to the diesel engine 2 via an exhaust manifold 9. The intake passage 8 is a passage through which air (intake air) sucked into each combustion chamber 4 flows. The exhaust passage 10 is a passage through which exhaust gas generated in each combustion chamber 4 flows.

  The engine system 1 also includes a turbocharger 11 that supercharges intake air. The turbocharger 11 includes a turbine 12 disposed in the exhaust passage 10, a compressor 13 disposed in the intake passage 8, and a shaft 14 that connects the turbine 12 and the compressor 13. The turbine 12 rotates in response to the flow of exhaust gas. The compressor 13 compresses intake air using the torque of the turbine 12.

  An air cleaner 15 that removes foreign matters such as dust and dust contained in the intake air is disposed upstream of the compressor 13 in the intake passage 8. An air-cooled intercooler 16 and a throttle valve 17 are sequentially arranged toward the diesel engine 2 on the downstream side of the compressor 13 in the intake passage 8. The intercooler 16 is a heat exchanger that cools the intake air supercharged by the turbocharger 11. The throttle valve 17 adjusts the air flow rate sucked into the diesel engine 2. On the downstream side of the turbine 12 in the exhaust passage 10, a DPF 18 with a catalyst that removes particulate matter in the exhaust gas is disposed.

  The engine system 1 also includes an EGR unit 20 that recirculates a part of the exhaust gas generated in the combustion chamber 4 to the combustion chamber 4 as EGR gas (exhaust gas recirculation gas). The EGR unit 20 includes an EGR passage 21 that connects the exhaust manifold 9 and the intake passage 8, an EGR valve 22 that adjusts the recirculation amount of EGR gas from the exhaust manifold 9 to the intake passage 8, and an EGR gas that flows through the EGR passage 21. An EGR cooler 23 for cooling the EGR cooler 23, a bypass passage 24 connected to the EGR passage 21 so as to bypass the EGR cooler 23, and a switching valve 25 for switching the EGR gas flow path to the EGR cooler 23 or the bypass passage 24. doing.

  FIG. 2 is a view showing a side view of the intercooler 16 together with the compressor 13 and the air cleaner 15. FIG. 3 is a plan view of the intercooler 16. 2 and 3, the intercooler 16 has a rectangular parallelepiped shape.

  The intercooler 16 includes a plurality of flat tube-like intake air circulation portions 26 through which intake air passes, and a plurality of cooling air circulation portions 27 through which cooling air (running wind) that cools the intake air flowing through the intake air circulation portion 26 passes. The inlet header 28 is disposed on the upstream side of each intake air circulation portion 26, and the outlet header 29 is disposed on the downstream side of each intake air circulation portion 26.

  The intake air circulation part 26 and the cooling air circulation part 27 are alternately stacked between the inlet header 28 and the outlet header 29. An intake air circulation part 26 is arranged at the uppermost part and the lowermost part of the intercooler 16. The cooling air circulation unit 27 is provided with fins. The cooling air circulation unit 27 exchanges heat between the intake air and the cooling air. The direction in which the intake air passes through the intake air circulation part 26 is orthogonal to the direction in which the cooling air passes through the cooling air circulation part 27.

  The inlet header 28 communicates the intake passage 8 on the compressor 13 side and each intake air circulation portion 26 and introduces intake air from the intake passage 8 to each intake air circulation portion 26. The outlet header 29 communicates each intake air circulation portion 26 with the intake passage 8 on the throttle valve 17 side and guides intake air from each intake air circulation portion 26 to the intake passage 8.

  A hot water pipe 30 through which engine cooling water after cooling the diesel engine 2 is attached so as to heat the intake air flowing through the intake air circulation portion 26 is attached to a portion on the outlet side of the intake air in the intercooler 16. The hot water piping 30 is attached to the side surface 16a on the upstream side of the cooling air in the intercooler 16 by welding. The hot water pipe 30 is arranged at the lower end of the intercooler 16 in the height direction of the intercooler 16 (in the stacking direction of the intake air circulation portion 26 and the cooling air circulation portion 27) in the portion of the side surface 16a of the intercooler 16 on the outlet air side. It is attached to extend from the top to the top. Specifically, the hot water pipe 30 is attached to the inlet header 28 side by a predetermined length from the outlet header 29 on the side surface 16a of the intercooler 16.

  The hot water pipe 30 has a rectangular tube shape so that it can be easily welded to the side surface 16 a of the intercooler 16. However, the hot water pipe 30 may have a cylindrical shape. The dimensions of the hot water pipe 30 are determined so as not to affect the cooling efficiency of the intercooler 16 in a normal temperature (for example, 25 ° C.) environment.

  FIG. 4 is a configuration diagram showing an engine coolant circulation system including a part of the intake device according to the embodiment of the present invention. In FIG. 4, the engine coolant circulation system 31 has a circulation path 32 through which the engine coolant circulates. In the circulation path 32, the diesel engine 2 and the radiator 33 are disposed in order. The radiator 33 cools the warm engine cooling water after passing through the diesel engine 2 with traveling wind. The temperature of the engine coolant immediately after passing through the diesel engine 2 is about 80 ° C to 90 ° C. The diesel engine 2 is provided with a water pump 34 that pumps and circulates engine cooling water.

  One end of the hot water pipe 30 and a portion of the circulation path 32 between the diesel engine 2 and the radiator 33 are connected via a bypass pipe 35 (first pipe). The other end of the hot water pipe 30 and the downstream portion of the radiator 33 in the circulation path 32 are connected via a bypass pipe 36 (second pipe). Note that the diameters of the bypass pipes 35 and 36 are sufficiently smaller than the diameters of the pipes constituting the circulation path 32.

  In such an engine coolant circulation system 31, the engine coolant is circulated through the circulation path 32, whereby the diesel engine 2 is cooled. At this time, the warm engine coolant after passing through the diesel engine 2 flows through the bypass pipe 35, the hot water pipe 30 and the bypass pipe 36 and returns to the circulation path 32.

  In the above, the intake passage 8, the compressor 13, the air cleaner 15, the intercooler 16, the throttle valve 17, the hot water pipe 30 and the bypass pipes 35 and 36 constitute the intake device 37 of the present embodiment.

  By the way, in a cold region, for example, when the vehicle is traveling in a state where the outside air temperature is lower than 0 ° C. (freezing point), the intake air is compressed by the compressor 13 and the temperature of the intake air rises. Although the temperature on the inlet side of the intake air does not fall below 0 ° C., the intake air is cooled in the vicinity of the outlet of the intake air in the intercooler 16 while the intake air flows from the inlet side to the outlet side. The temperature becomes 0 ° C. or lower. For this reason, as shown in FIG. 5, frost S is generated near the outlet of the intake air in the intercooler 16. Specifically, frost S is generated at the outlet header 29 side of each intake air circulation section 26 and the outlet header 29. Thereafter, when the vehicle moves to a place where the outside air temperature is higher than 0 ° C. such as an indoor parking lot, the frost S near the outlet of the intake air in the intercooler 16 is melted, and a large amount of water is in the intercooler 16. Accumulate. When the water enters the combustion chamber 4 of the diesel engine 2, problems such as rough idle occur during operation of the diesel engine 2.

  In order to deal with such a problem, in the present embodiment, the diesel engine 2 is installed so as to heat the intake air flowing through the intake air circulation portion 26 to the hot water pipe 30 attached to the portion of the intercooler 16 on the outlet side of the intake air. After cooling, warm engine coolant flows. Therefore, since the temperature near the intake air outlet in the intercooler 16 is unlikely to become below the freezing point, frost S is prevented from being generated in the vicinity of the intake air outlet in the intercooler 16. This prevents the frost S generated in the intercooler 16 from melting and collecting water in the intercooler 16, thereby preventing water from entering the combustion chamber 4 of the diesel engine 2 from the intercooler 16. Is done.

  Further, in the present embodiment, the hot water pipe 30 is attached so as to extend in the stacking direction of the intake air circulation portion 26 and the cooling air circulation portion 27 at a portion of the side surface 16a of the intercooler 16 on the outlet side of the intake air. . Therefore, since the temperature near the outlet header 29 of each intake air circulation part 26 and the temperature of the outlet header 29 are not easily below the freezing point, frost S is generated near the outlet header 29 and the outlet header 29 of each intake air circulation part 26. It is prevented.

  In the present embodiment, one end of the hot water pipe 30 and a portion of the circulation path 32 between the diesel engine 2 and the radiator 33 are connected via the bypass pipe 35, and the other end of the hot water pipe 30 and the circulation path are connected. A portion on the downstream side of the radiator 33 in 32 is connected via a bypass pipe 36. Therefore, the engine cooling water immediately after passing through the diesel engine 2 is supplied to the hot water pipe 30 through the bypass pipe 35, so that the engine cooling water that is hot water surely flows through the hot water pipe 30.

  FIG. 6 is a configuration diagram showing an engine coolant circulation system including a part of an intake device according to another embodiment of the present invention. In FIG. 6, the intake device 40 of this embodiment includes an electromagnetic on-off valve 41, an intake air temperature sensor 42, and an ECU (electronic control unit) 43 in addition to the configuration of the intake device 37 described above.

  The on-off valve 41 is disposed in the bypass pipe 35. The intake air temperature sensor 42 is attached to the air cleaner 15 or the like, for example. The intake air temperature sensor 42 constitutes a detection unit that detects the outside air temperature by measuring the temperature of the intake air (intake air temperature).

  The ECU 43 includes a CPU, a RAM, a ROM, an input / output interface, and the like. The ECU 43 constitutes a control unit that controls the on-off valve 41 based on the detection value of the intake air temperature sensor 42.

  FIG. 7 is a flowchart showing a procedure of on-off valve control processing executed by the ECU 43. In FIG. 7, the ECU 43 first obtains a detection value of the intake air temperature sensor 42 (step S101). The ECU 43 determines whether or not the outside air temperature detected by the intake air temperature sensor 42 is below the freezing point (step S102).

  When the ECU 43 determines that the outside air temperature is below the freezing point, the ECU 43 controls to open the on-off valve 41 (step S103). Thereby, warm engine cooling water immediately after passing through the diesel engine 2 flows through the bypass pipe 35 to the hot water pipe 30. When the ECU 43 determines that the outside air temperature is not below the freezing point, the ECU 43 controls to close the on-off valve 41 (step S104). Thereby, warm engine cooling water immediately after passing through the diesel engine 2 does not flow into the hot water pipe 30.

  In this embodiment, when the outside air temperature is below the freezing point, the on-off valve 41 is opened so that the engine cooling water flows through the hot water pipe 30. When the outside air temperature is not below the freezing point, the on-off valve 41 is opened. When the valve is closed, the engine cooling water does not flow through the hot water pipe 30. Therefore, in the state where the outside air temperature is higher than the freezing point, the cooling efficiency of the intake air by the cooling air is not affected.

  In this embodiment, the outside air temperature is detected by measuring the intake air temperature with the intake air temperature sensor 42. However, the present invention is not particularly limited to this mode, and the outside air temperature can be estimated from the engine coolant water temperature. Alternatively, the outside air temperature may be directly measured.

  As mentioned above, although embodiment of this invention has been described, this invention is not limited to the said embodiment. For example, in the said embodiment, although the hot water piping 30 is attached to the inlet header 28 side only predetermined length rather than the outlet header 29 in the side surface 16a of the intercooler 16, it is not restricted to the form in particular. The hot water pipe 30 may be attached to a position adjacent to the outlet header 29 on the side surface 16 a of the intercooler 16, or may be attached to the outlet header 29.

  Moreover, in the said embodiment, although the hot water piping 30 is attached to the side surface 16a of the upstream side of the cooling air in the intercooler 16, the hot water piping 30 is attached to the part of the exit side of the intake air in the intercooler 16. If it exists, it will not be restricted to the form in particular. The hot water piping 30 may be attached to the downstream side surface of the cooling air in the intercooler 16, or may be attached to the upstream side surface and the downstream side surface of the cooling air in the intercooler 16. Further, the hot water pipe 30 may be attached to the upstream and downstream side surfaces of the cooling air in the intercooler 16 and the upper surface or the lower surface of the intercooler 16 over a U shape.

  Moreover, in the said embodiment, although the diesel engine 2 is a 4-cylinder inline engine, as a structure of the diesel engine 2, it is not restricted to it in particular, A 6-cylinder inline engine or an 8-cylinder inline engine etc. may be sufficient, Alternatively, a V-type engine may be used.

  Further, the present invention is not limited to the diesel engine 2 but can be applied to a gasoline engine.

  DESCRIPTION OF SYMBOLS 2 ... Diesel engine (engine), 8 ... Intake passage, 16 ... Intercooler, 16a ... Side surface, 26 ... Intake air circulation part, 27 ... Cooling air circulation part, 28 ... Inlet header, 29 ... Outlet header, 30 ... Hot water piping 32 ... circulation path, 33 ... radiator, 35 ... bypass piping (first piping), 36 ... bypass piping (second piping), 37 ... intake device, 40 ... intake device, 41 ... open / close valve, 42 ... intake temperature sensor (Detection unit), 43... ECU (control unit).

Claims (4)

An intake passage connected to the engine and through which intake air flows;
An intercooler disposed in the intake passage,
The intercooler has an intake air circulation part through which the intake air passes, and a cooling air circulation part through which cooling air for cooling the intake air flowing through the intake air circulation part passes.
The intake air is connected to a portion of the intercooler on the outlet side of the intake air, and a hot water pipe through which engine cooling water after cooling the engine is heated so as to heat the intake air flowing through the intake air circulation portion. apparatus. The intercooler includes an inlet header for introducing the intake air into the intake air circulation portion, and an outlet header for deriving the intake air from the intake air circulation portion, and between the inlet header and the outlet header. And the intake air circulation part and the cooling air circulation part are alternately laminated,
2. The intake device according to claim 1, wherein the hot water pipe is attached so as to extend in a stacking direction of the intake air circulation portion and the cooling air circulation portion at a portion of the side surface of the intercooler on the outlet side of the intake air. . A first pipe connecting one end of the hot water pipe and a portion between the engine and the radiator in a circulation path for circulating the engine cooling water;
The intake device according to claim 1, further comprising a second pipe that connects the other end of the hot water pipe and a downstream portion of the radiator in the circulation path. An on-off valve disposed in the first pipe;
A detection unit for detecting the outside air temperature;
The intake device according to claim 3, further comprising: a control unit configured to control the engine cooling water to flow to the hot water pipe by opening the on-off valve when an outside air temperature detected by the detection unit is below a freezing point.

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