JP2021050705A - Suction device - Google Patents

Abstract

To prevent moisture in blow-by gas from being cooled and frozen by outside air, by using a structure that saves space and can reduce restrictions on the routing of a blow-by gas pipe and an exhaust gas pipe.SOLUTION: A suction device mounted on an internal combustion engine, has an exhaust recirculation device that recirculates exhaust gas from the internal combustion engine to the internal combustion engine, and a blow-by gas recirculation device that recirculates blow-by gas from the internal combustion engine to the internal combustion engine. The suction device also has: a suction pipe that suctions outside air into the internal combustion engine; a blow-by gas pipe that supplies the blow-by gas from the internal combustion engine to the suction pipe; and an exhaust gas pipe that supplies the exhaust gas from the internal combustion engine to the suction pipe. The blow-by gas pipe inserts the exhaust gas pipe.SELECTED DRAWING: Figure 1

Description

The present disclosure discloses an intake air mounted on an internal combustion engine having an exhaust gas recirculation device for recirculating the exhaust gas from the internal combustion engine to the internal combustion engine and a blow-by gas recirculation device for returning the blow-by gas from the internal combustion engine to the internal combustion engine. Regarding the device.

Conventionally, an exhaust recirculation device that supplies a part of exhaust gas from an internal combustion engine to an intake pipe and recirculates it to the internal combustion engine, and blow-by gas leaked from a gap between a piston and a cylinder of the internal combustion engine are supplied to the intake pipe. An internal combustion engine having a blow-by gas recirculation device for recirculating the internal combustion engine is known. Conventionally, in such an internal combustion engine, when the outside air temperature is extremely low, the blow-by gas returned to the internal combustion engine is cooled by the intake outside air, so that the moisture in the blow-by gas freezes and the blow-by gas is frozen. There is a problem that the internal combustion engine or the like is damaged because the ice generated by blocking the passage or freezing the water in the blow-by gas is sucked into the internal combustion engine side.

Under such circumstances, Patent Document 1 is discharged from the outer wall of a PCV passage (PCV: Positive Crankcase Ventilation) for returning blow-by gas containing unburned gas as a main component leaked into the engine to an intake port, and from the engine. It is disclosed that a part of the outer wall of the EGR passage for returning the exhaust gas to the intake port is shared, and the shared part is used as a heating part to prevent the blow-by gas flowing through the PCV passage from freezing.

Further, in Patent Document 2, the blow-by gas introduction port for introducing the blow-by gas generated in the internal combustion engine into the intake pipe is more than the exhaust gas introduction port for introducing the exhaust gas exhausted from the internal combustion engine into the intake pipe. The intake device arranged on the downstream side is disclosed.

Japanese Unexamined Patent Publication No. 2013-151906 Japanese Unexamined Patent Publication No. 2017-11603

However, in Patent Document 1, since the PVC passage and the EGR passage (EGR: Exhaust Gas Recirculation) are provided side by side, it is difficult to save space and there are restrictions on the routing of the PVC passage and the EGR passage. Have a challenge. Further, Patent Document 2 has a problem that the blow-by gas cannot be sufficiently heated when the amount of the exhaust gas exhausted from the internal combustion engine is not sufficient.

An object of the present disclosure is an intake air that can save space and reduce restrictions on the routing of blow-by gas passages and exhaust gas passages, and can prevent moisture in blow-by gas from being cooled by the outside air and freezing. To provide a device.

The intake device according to the present disclosure includes an exhaust recirculation device that recirculates the exhaust gas from the internal combustion engine to the internal combustion engine, and a blow-by gas recirculation device that recirculates the blow-by gas from the internal combustion engine to the internal combustion engine. An intake device mounted on the internal combustion engine, the intake pipe for sucking outside air into the internal combustion engine, the blow-by gas passage for supplying the blow-by gas from the internal combustion engine to the intake pipe, and the internal combustion engine. It has an exhaust gas passage for supplying the exhaust gas to the intake pipe, and one of the blow-by gas passage and the exhaust gas passage has a structure in which the other is inserted.

According to the present disclosure, the structure can save space and reduce the restrictions on the routing of the blow-by gas passage and the exhaust gas passage, so that the moisture in the blow-by gas is cooled by the outside air and does not freeze. be able to.

It is a perspective view of the intake device which concerns on Embodiment 1 of this disclosure. It is sectional drawing of a part of the intake device which concerns on Embodiment 1 of this disclosure. It is sectional drawing of the intersection of the blow-by gas pipe and the exhaust gas pipe of the intake device which concerns on Embodiment 1 of this disclosure. It is sectional drawing in the closed state of the breather valve of the intake device which concerns on Embodiment 1 of this disclosure. It is sectional drawing in the open state of the breather valve of the intake device which concerns on Embodiment 1 of this disclosure. It is a perspective view of the intake device which concerns on Embodiment 2 of this disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings as appropriate.

(Embodiment 1)
<Structure of intake device>
The configuration of the intake device 1 according to the first embodiment of the present disclosure will be described in detail below with reference to FIGS. 1 to 5.

The intake device 1 according to the present embodiment includes an exhaust gas recirculation device that recirculates exhaust gas from an internal combustion engine (not shown) to the internal combustion engine, and a blow-by gas recirculation device that recirculates blow-by gas from the internal combustion engine to the internal combustion engine. It is installed in an internal combustion engine that has.

Specifically, in the intake device 1, the exhaust gas from the internal combustion engine cooled by the EGR cooler 2 is supplied from the EGR cooler 2, and the exhaust gas and blow-by recirculated by the intake outside air and the exhaust recirculation device. An air-fuel mixture mixed with blow-by gas recirculated by the gas recirculation device is supplied to the turbo device 3, and is an exhaust gas pipe 10 which is an exhaust gas passage, a blow-by gas pipe 20 which is a blow-by gas passage, and an intake pipe. It has 30 and.

The exhaust gas pipe 10 constitutes a part of the exhaust gas recirculation device, and supplies the exhaust gas from the internal combustion engine to the intake pipe 30. The exhaust gas pipe 10 includes an EGR valve case 11 and an EGR valve 12.

The blow-by gas pipe 20 is inserted into the EGR valve case 11 so as to intersect and penetrate the exhaust gas pipe 10 in a direction orthogonal to the exhaust gas pipe 10. FIG. 3 is a cross-sectional view of the horizontal cross section of the portion where the blow-by gas pipe 20 is inserted into the exhaust gas pipe 10 as viewed from above, and as shown in the figure, the exhaust gas wraps around the outside of the outer wall of the blow-by gas pipe 20. The structure is such that (EGR gas) flows, and the EGR valve case 11 is inserted into the exhaust gas pipe 10 by flowing the exhaust gas (EGR gas) around the inserted blow-by gas pipe 20. The portion of the blow-by gas pipe 20 located inside the 10 is heated by the exhaust gas (EGR gas). As a result, the heat of the exhaust gas (EGR gas) is transferred to the blow-by gas flowing inside the blow-by gas pipe 20 through the outer wall, and the blow-by gas is warmed.

The EGR valve 12 as the second valve is openable and closable, and is opened and closed under the control of a control device (not shown) such as an ECU (Electronic Control Unit) to adjust the flow rate of the exhaust gas supplied to the intake pipe 30.

The blow-by gas pipe 20 constitutes a part of the blow-by gas recirculation device, and supplies the blow-by gas from the internal combustion engine to the intake pipe 30. The blow-by gas pipe 20 includes a breather valve 21 that can be opened and closed to adjust the flow rate of the blow-by gas supplied to the intake pipe 30. The blow-by gas pipe 20 has an exhaust gas pipe 10 inserted on the downstream side of the breather valve 21 of the blow-by gas flow path.

The breather valve 21 as the first valve has a structure as shown in FIGS. 4 and 5, and has a head cover (cylinder head cover) 22, an elastic member 23, a cover 24, a diaphragm 25, and a discharge portion 26. And a connection portion 27. The head cover 22 covers the breather valve 21. The elastic member 23 urges the diaphragm 25 in a direction away from the cover 24 (downward in FIGS. 4 and 5), and is, for example, a spring. The cover 24 is attached to and fixed to the head cover 22.

The diaphragm 25 is formed of a member such as elastically deformable rubber, and is movable between the position shown in FIG. 4 for closing the discharge portion 26 and the position shown in FIG. 5 for opening the discharge portion 26. It has become.

The discharge portion 26 is tubular, one end of which is openly closed by the diaphragm 25, and the other end of which is connected to the connection portion 27 to supply the inflowing blow-by gas to the connection portion 27. The connection portion 27 is tubular and connects the discharge portion 26 and the blow-by gas pipe 20, and supplies the blow-by gas supplied from the discharge portion 26 to the blow-by gas pipe 20.

The intake pipe 30 supplies the intake outside air to the turbo device 3, and also supplies the exhaust gas flowing from the exhaust gas pipe 10 and the blow-by gas flowing from the blow-by gas pipe to the turbo device 3. The intake pipe 30 includes an upstream pipe 31, a downstream pipe 32, and an intake adapter 33 arranged between them. The upstream pipe 31 connects an air cleaner (not shown) and an intake adapter 33, and supplies the outside air taken in through the air cleaner to the intake adapter 33.

The downstream pipe 32 connects the turbo device 3 and the intake adapter 33, and supplies the turbo device 3 with a mixture of the outside air, the exhaust gas, and the blow-by gas supplied from the intake adapter 33. The intake adapter 33 connects the upstream pipe 31 and the downstream pipe 32, and is also connected to the exhaust gas pipe 10 and the blow-by gas pipe 20. The intake adapter 33 supplies the downstream pipe 32 with a mixture of the outside air supplied from the upstream pipe 31, the exhaust gas supplied from the exhaust gas pipe 10, and the blow-by gas supplied from the blow-by gas pipe 20.

<Operation of intake device>
The operation of the intake device 1 according to the first embodiment of the present disclosure will be described in detail below.

First, by starting the internal combustion engine, the pressure inside the cylinder head rises, and blow-by gas begins to flow. The temperature of the blow-by gas at this time is low because the internal combustion engine is not warmed up.

Next, the diaphragm 25 blocking the discharge portion 26 of the breather valve 21 is pressed upward in FIGS. 4 and 5 by the pressure of the blow-by gas from the internal combustion engine, so that the diaphragm 25 is attached to the elastic member 23. One end of the discharge portion 26 is opened by elastically deforming upward against the force. Next, blow-by gas flows into one end of the opened discharge unit 26. Next, the blow-by gas that has flowed into the discharge unit 26 is supplied to the blow-by gas pipe 20 via the connection unit 27. Next, the blow-by gas supplied to the blow-by gas pipe 20 exchanges heat with the exhaust gas flowing through the exhaust gas pipe 10 in the EGR valve case 11 of the exhaust gas pipe 10 in the process of flowing toward the intake pipe 30. It is heated by. (See FIGS. 2 and 3)

Next, the blow-by gas heated by the exhaust gas is supplied to the intake pipe 30. At this time, even when the outside air taken in by the intake pipe 30 is extremely low, the blow-by gas is heated by the exhaust gas before entering the intake pipe 30, so that the moisture in the blow-by gas freezes. You can prevent that.

Next, the blow-by gas supplied to the intake pipe 30 is mixed with the outside air and the exhaust gas supplied from the exhaust gas pipe 10 to the intake pipe 30 in the intake adapter 33 and supplied to the turbo device 3.

As described above, according to the present embodiment, since the blow-by gas pipe 20 has a structure through which the exhaust gas pipe 10 is inserted, space can be saved and the blow-by gas pipe and the exhaust gas pipe can be routed. The restrictions can be reduced, and the moisture in the blow-by gas can be cooled by the outside air to prevent it from freezing.

Further, according to the present embodiment, the blow-by gas pipe 20 is warmed by inserting the exhaust gas pipe 10 on the downstream side of the breather valve 21 in the flow direction of the blow-by gas and in the vicinity of the intake pipe 30. Blow-by gas can be supplied to the intake pipe 30.

(Embodiment 2)
<Structure of intake device>
The configuration of the intake device 100 according to the second embodiment of the present disclosure will be described in detail below with reference to FIG. In FIG. 6, the parts having the same configuration as those in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted.

The intake device 100 according to the present embodiment includes an exhaust gas recirculation device that recirculates exhaust gas from an internal combustion engine (not shown) to the internal combustion engine, and a blow-by gas recirculation device that recirculates blow-by gas from the internal combustion engine to the internal combustion engine. It is installed in an internal combustion engine that has.

Specifically, in the intake device 100, the exhaust gas from the internal combustion engine cooled by the EGR cooler 2 flows in, and the exhaust gas recirculated by the intake outside air and the exhaust gas recirculation device and the blow-by gas recirculation device return the exhaust gas. The air-fuel mixture mixed with the blow-by gas is supplied to the turbo device 3, and the exhaust gas pipe 10, the blow-by gas pipe 20, the intake pipe 30, and the control unit (hereinafter, referred to as "ECU"). It has 101 and a temperature sensor 102.

The ECU 101 as a control unit is an electronic control device that controls the operation of the internal combustion engine. The ECU 101 controls to increase the opening degree of the EGR valve 12 as the intake air temperature indicated by the electric signal acquired by the temperature sensor 102 is lower. As a result, the ECU 101 increases the flow rate of the exhaust gas as the intake air temperature becomes lower to promote heat exchange with the blow-by gas. The temperature sensor 102 as a temperature measuring unit is provided on the intake adapter 33 of the intake pipe 30. The temperature sensor 102 measures the temperature of the outside air taken into the intake pipe 30 and outputs an electric signal corresponding to the measured temperature to the ECU 101.

Since the operation of the intake device 100 is the same as the operation of the intake device 1, the description thereof will be omitted.

As described above, according to the present embodiment, by controlling the opening degree of the EGR valve 12 based on the intake air temperature measured by the temperature sensor 102, in addition to the effect of the first embodiment, in blow-by gas. It is possible to prevent the water contained in the water from freezing.

Further, according to the present embodiment, the lower the intake air temperature, the larger the opening degree of the EGR valve 12 is controlled to increase the flow rate of the exhaust gas supplied from the exhaust gas pipe 10 to the intake pipe 30. The temperature can be raised and the water contained in the blow-by gas can be reliably prevented from freezing.

In the present embodiment, the opening degree of the EGR valve 12 is controlled according to the intake air temperature, but the opening degree of the EGR valve 12 may be controlled according to the intake air temperature and the exhaust temperature or the load of the internal combustion engine. ..

Further, in the present embodiment, the intake air temperature is measured by the temperature sensor 102, but the intake air temperature may be measured by a temperature measuring member other than the temperature sensor, or the detection value related to the internal combustion engine detected by another sensor may be used. The intake air temperature may be estimated.

The present disclosure is not limited to the above-described embodiment in terms of the type, arrangement, number, etc. of the members, and the present disclosure does not deviate from the gist of the invention, such as appropriately substituting the constituent elements with those having the same effect and effect. Of course, it can be changed as appropriate.

Specifically, in the first and second embodiments, the blow-by gas pipe 20 is inserted in the direction orthogonal to the exhaust gas pipe 10, but the blow-by gas pipe 20 inserts the exhaust gas pipe 10. It may be inserted diagonally. Further, contrary to the first and second embodiments, the inside of the blow-by gas pipe 20 that flows so that the exhaust gas pipe 10 passes through the blow-by gas pipe 20 and comes into contact with the outer wall of the exhaust gas pipe 10. The blow-by gas may be configured to receive heat from the exhaust gas.

Further, although the turbo device 3 is provided in the first and second embodiments, the turbo device 3 may not be provided.

Further, in the first and second embodiments, heat exchange between the exhaust gas and the blow-by gas was performed in the EGR valve case 11, but on the upstream side of the EGR cooler 2 in the flow path of the exhaust gas pipe 10. The heat exchange between the exhaust gas and the blow-by gas may be performed. In this case, the restriction on the routing of the blow-by gas pipe 20 increases, but the blow-by gas exchanges heat with the exhaust gas at a higher temperature than when the exhaust gas and the blow-by gas exchange heat with the EGR valve case 11. Therefore, it is possible to ensure that the water contained in the blow-by gas is not frozen.

The intake device of the present disclosure can be widely applied to an internal combustion engine mounted on a vehicle, an internal combustion engine for a ship, various internal combustion engines used in a stationary manner, and various internal combustion engines used in other industrial equipment.

The present disclosure discloses an intake air mounted on an internal combustion engine having an exhaust gas recirculation device for recirculating the exhaust gas from the internal combustion engine to the internal combustion engine and a blow-by gas recirculation device for returning the blow-by gas from the internal combustion engine to the internal combustion engine. Suitable for equipment.

1 Intake device 2 EGR cooler 3 Turbo device 10 Exhaust gas pipe 11 EGR valve case 12 EGR valve 20 Blow-by gas pipe 21 Breather valve 22 Head cover 23 Elastic member 24 Cover 25 Diaphragm 26 Exhaust part 27 Connection part 30 Intake pipe 31 Upstream pipe 32 Downstream Pipe 33 Intake adapter 100 Intake device 101 ECU
102 temperature sensor

Claims (4)

An intake air mounted on the internal combustion engine having an exhaust gas recirculation device for recirculating the exhaust gas from the internal combustion engine to the internal combustion engine and a blow-by gas recirculation device for returning the blow-by gas from the internal combustion engine to the internal combustion engine. It ’s a device,
An intake pipe that draws outside air into the internal combustion engine,
A blow-by gas passage that supplies the blow-by gas from the internal combustion engine to the intake pipe, and
An exhaust gas passage that supplies the exhaust gas from the internal combustion engine to the intake pipe, and
Have,
The blow-by gas passage and the exhaust gas passage have a structure in which one passes through the other.
Intake device. In the insertion structure, one of the blow-by gas passage and the exhaust gas passage is inserted in a direction orthogonal to the other.
The intake device according to claim 1. It has a first valve that is provided in the blow-by gas passage and can be opened and closed to adjust the flow rate of the blow-by gas supplied from the blow-by gas passage to the intake pipe.
The first valve is arranged downstream of the position where the blow-by gas passage passes through the exhaust gas passage in the direction in which the blow-by gas flows.
The intake device according to claim 1 or 2. A temperature measuring unit that measures the intake air temperature in the intake pipe,
A second valve that is provided in the exhaust gas passage and can be opened and closed to adjust the flow rate of the exhaust gas supplied from the exhaust gas passage to the intake pipe.
A control unit that controls the opening degree of the second valve based on the intake air temperature measured by the temperature measuring unit.
Have,
The intake device according to any one of claims 1 to 3.

Images