JP6327292B2 - Control device for internal combustion engine - Google Patents

Description

  The present invention relates to a control device for an internal combustion engine having a compressor disposed in an intake passage.

Conventionally, a turbocharger having a compressor disposed in an intake passage of an internal combustion engine is known. An example of this type of turbocharger is disclosed in Patent Document 1, for example. In the turbocharger described in Patent Document 1, a cooling water passage for cooling the compressor housing is formed in the compressor housing.
Japanese Patent Application Laid-Open No. 2003-133826 discloses that cooling water is passed through a cooling water passage in the compressor housing when the internal combustion engine is started until a predetermined time elapses from the start of the internal combustion engine, and a predetermined time from the start of the internal combustion engine. It is described that the cooling water is passed through the cooling water passage in the compressor housing when the internal combustion engine is stationary after the elapse of time.
That is, in the turbocharger described in Patent Document 1, cooling water is always passed through the cooling water passage in the compressor housing during operation of the internal combustion engine.

JP 2014-129724 A

By the way, during operation of the internal combustion engine, there are times when it is necessary to increase the temperature of the intake air supplied to the internal combustion engine body, such as when the outside air temperature is low. Further, during operation of the internal combustion engine, there are times when the cooling water temperature is low, such as when the internal combustion engine is started.
In the turbocharger described in Patent Document 1, if the outside air temperature is low when the internal combustion engine is started, the temperature of the intake air supplied to the internal combustion engine body needs to be increased, but the cooling water passage in the compressor housing is not provided. On the other hand, since the low-temperature cooling water is passed, there is a possibility that the temperature of the intake air supplied to the internal combustion engine body is lowered.

  In view of the above problems, the present invention sufficiently reduces the risk that the temperature of the intake air supplied to the internal combustion engine body will decrease when it is necessary to increase the temperature of the intake air supplied to the internal combustion engine body. An object of the present invention is to provide a control device for an internal combustion engine that can supply intake air whose temperature has risen to the internal combustion engine body.

According to the present invention, an internal combustion engine body;
An intake passage connected to the internal combustion engine body;
A compressor disposed in the intake passage;
A control device for an internal combustion engine comprising a first coolant passage formed in a housing of the compressor;
The intake air temperature after supercharging, which is the temperature of the intake air in the intake passage on the downstream side of the compressor, is lower than a preset threshold value, and the temperature of the cooling water in the first cooling water passage is the intake air after the supercharging. In the first case where the temperature is higher than the temperature, the cooling water is passed through the first cooling water passage,
When the post-supercharging intake air temperature is lower than the threshold value and the temperature of the cooling water in the first cooling water passage is equal to or lower than the post-supercharging intake air temperature, the cooling to the first cooling water passage is performed. A control device for an internal combustion engine is provided in which the amount of water flow is reduced as compared with the first case.

That is, in the control apparatus for an internal combustion engine of the present invention, the temperature of the intake air in the intake passage on the downstream side of the compressor (the intake air temperature after supercharging) is lower than a preset threshold value and is formed in the compressor housing. In the first case where the temperature of the cooling water in the one cooling water passage is higher than the intake air temperature after supercharging, the cooling water is passed through the first cooling water passage.
That is, in the control device for an internal combustion engine of the present invention, for example, the temperature of the intake air supplied to the internal combustion engine body needs to be increased because the outside air temperature is low, but the intake air temperature is only increased by supercharging by the compressor. Then, in the first case where the intake air whose temperature has risen sufficiently cannot be supplied to the internal combustion engine body, the intake air in the compressor housing is heated by the cooling water having a temperature higher than the intake air temperature after supercharging.
Therefore, in the control apparatus for an internal combustion engine of the present invention, when cooling water having a temperature lower than the intake air temperature after supercharging is passed through the first cooling water passage, or when the cooling water having a temperature higher than the intake air temperature after supercharging is the first. The intake air temperature after supercharging can be increased as compared with the case where water is not passed through one cooling water passage. For example, when the outside air temperature is low, the temperature of the intake air supplied to the internal combustion engine body needs to be increased. In addition, intake air whose temperature has risen sufficiently can be supplied to the internal combustion engine body.

In the control device for an internal combustion engine according to the present invention, the after-supercharging intake air temperature is lower than a preset threshold value, and the temperature of the cooling water in the first cooling water passage is equal to or lower than the after-supercharging intake air temperature. In this case, the amount of cooling water passing through the first cooling water passage is reduced more than in the first case.
That is, in the control device for an internal combustion engine of the present invention, for example, the temperature of the intake air supplied to the internal combustion engine body needs to be increased because the outside air temperature is low, but the first cooling water passage is the same as in the first case. In the second case where there is a possibility that the temperature of the intake air supplied to the internal combustion engine body may decrease when the coolant water is passed through the coolant, the coolant water is not passed through the first coolant passage. Alternatively, the cooling water flow with respect to the first cooling water passage is executed with a smaller water flow amount than in the first case.
Therefore, in the control apparatus for an internal combustion engine of the present invention, when the temperature of the intake air supplied to the internal combustion engine body needs to be increased, the possibility that the temperature of the intake air supplied to the internal combustion engine body will decrease is reduced. be able to.

  In the control apparatus for an internal combustion engine of the present invention, the first cooling water passage may be disposed at a position facing the compressor impeller in the housing of the compressor or at a position upstream of the position. .

That is, in the control apparatus for an internal combustion engine of the present invention, the first cooling water passage is disposed at a position facing the compressor impeller in the compressor housing or at a position upstream of the position. Therefore, the intake air after it has been compressed by the compressor and has risen in temperature (high-temperature supercharged intake air) is heated by cooling water having a temperature higher than the post-supercharge intake air temperature in the intake passage on the downstream side of the compressor. Instead, the intake air before it is compressed by the compressor and rises in temperature (low-temperature pre-supercharging intake air) is heated in the compressor housing by cooling water having a temperature higher than the post-supercharging intake air temperature.
In other words, in the control device for an internal combustion engine of the present invention, the low-temperature pre-charging intake air is heated by the cooling water, so that the intake air is more cooled than the high-temperature super-charging intake air is heated by the cooling water. Thus, the difference between the intake air temperature and the cooling water temperature at the time of heating can be increased.
Therefore, in the control device for an internal combustion engine of the present invention, when the high-temperature supercharged intake air is heated by the cooling water (that is, the difference between the intake air temperature and the cooling water temperature at the time when the intake air is heated by the cooling water is As a result, the intake air can be warmed by the cooling water more efficiently than the case where the intake air is supplied to the internal combustion engine body.

In the control device for an internal combustion engine of the present invention,
The internal combustion engine
A second cooling water passage formed in the internal combustion engine body;
A third cooling water passage connecting the first cooling water passage and the second cooling water passage;
A bypass passage for bypassing the first cooling water passage;
And a heating device that heats the cooling water bypassing the first cooling water passage.
Furthermore, in the control device for an internal combustion engine of the present invention, in the second case, the cooling water flow to the first cooling water passage is stopped and the cooling water flow to the bypass passage is executed. The cooling water bypassing the first cooling water passage may be heated by the heating device.

In other words, in the control device for an internal combustion engine of the present invention, the second after-supercharging intake air temperature is lower than a preset threshold, and the temperature of the cooling water in the first cooling water passage is equal to or lower than the after-supercharging intake air temperature. In this case, since the flow of the cooling water to the first cooling water passage is stopped, the temperature of the intake air supplied to the internal combustion engine body as the cooling water flow to the first cooling water passage is executed. Can be avoided.
Furthermore, in the control apparatus for an internal combustion engine of the present invention, the cooling water bypassing the first cooling water passage is heated in the second case, so that the temperature of the cooling water can be increased. As a result, by passing the coolant whose temperature has increased through the first coolant passage, intake air whose temperature has been sufficiently increased can be supplied to the internal combustion engine body earlier than when the coolant is not heated. .

  According to the present invention, when it is necessary to increase the temperature of the intake air supplied to the internal combustion engine body, the intake air whose temperature has been sufficiently increased while reducing the possibility of the temperature of the intake air supplied to the internal combustion engine body being reduced. Can be supplied to the internal combustion engine body.

It is the figure which showed roughly the principal part of the engine system to which the control apparatus of the internal combustion engine of 1st Embodiment was applied. It is a schematic block diagram of the other principal part of the engine system to which the control apparatus of the internal combustion engine of 1st Embodiment was applied. It is a flowchart for demonstrating the water flow control of the cooling water performed by the control apparatus of the internal combustion engine of 1st Embodiment. It is a schematic block diagram of the other principal part of the engine system to which the control apparatus of the internal combustion engine of 2nd Embodiment was applied. It is a flowchart for demonstrating the water flow control of the cooling water performed by the control apparatus of the internal combustion engine of 2nd Embodiment.

Hereinafter, a first embodiment of a control device for an internal combustion engine of the present invention will be described. FIG. 1 is a diagram schematically showing the main part of an engine system to which the control device for an internal combustion engine of the first embodiment is applied. FIG. 2 is a schematic block diagram of another main part of the engine system to which the control device for the internal combustion engine of the first embodiment is applied.
In the example shown in FIG. 1 of the engine system to which the control device for an internal combustion engine of the first embodiment is applied, an intake passage 11 is connected to the internal combustion engine body 10. A compressor 12 of a turbocharger (not shown) is disposed in the intake passage 11. A cooling water passage 12a6 that functions as a first cooling water passage is formed in the housing 12a of the compressor 12.
The housing 12a houses a compressor impeller 12b. The compressor impeller 12b is connected to a turbine impeller (not shown) through a shaft 12c. The shaft 12c is supported by a bearing (not shown) so as to be rotatable about the central axis 12c1. The housing 12a is provided with an inlet passage 12a1 extending in the direction of the central axis 12c1 of the shaft 12c and a scroll passage 12a2 extending in the circumferential direction of the shaft 12c. The inlet passage 12a1 is connected to a portion of the intake passage 11 upstream of the compressor 12. The scroll passage 12 a 2 is connected to a portion of the intake passage 11 on the downstream side of the compressor 12. Blow-by gas containing oil or the like is introduced from the internal combustion engine body 10 into a portion of the intake passage 11 upstream of the compressor 12 via a blow-by gas passage (not shown).
In the example shown in FIG. 1, a shroud surface 12a4, which is the surface of the shroud portion 12a3, protrudes from the inlet passage 12a1 toward the central axis 12c1, and faces the compressor impeller 12b. A diffuser portion 12a5 is provided between the compressor impeller 12b and the scroll passage 12a2. The kinetic energy of the intake air sent out by the compressor impeller 12b is converted into pressure by the diffuser portion 12a5, whereby the intake air is compressed and the intake air temperature rises.

In the example shown in FIG. 1 of the engine system to which the control device for an internal combustion engine of the first embodiment is applied, the intake air before the temperature rises by being compressed by the compressor 12 is changed into the coolant passage 12a6 having a temperature higher than that of the intake air. The cooling water passage 12a6 is arranged at a position facing the compressor impeller 12b so that it can be heated by the cooling water. However, in another example, the cooling water passage 12a6 is connected to the compressor impeller 12b instead. Also by disposing at a position upstream of the opposing position (left side in FIG. 1), the intake air before the temperature rises by being compressed by the compressor 12 is cooled by the cooling water in the cooling water passage 12a6 higher than the intake air. Can be warmed.
Alternatively, in still another example, the cooling water passage 12a6 can be disposed at a position other than the above-described position in the housing 12a of the compressor 12 instead.

  In the example shown in FIG. 1, the control device for the internal combustion engine of the first embodiment is applied to the engine system having the turbocharger compressor 12, but in another example, instead of the electric supercharger ( The control device for the internal combustion engine of the first embodiment can also be applied to an engine system having a compressor (not shown).

In the example shown in FIGS. 1 and 2 of the engine system to which the control device for the internal combustion engine of the first embodiment is applied, the cooling water passage 10a (see FIG. 2) functioning as the second cooling water passage is the internal combustion engine body 10. (See FIGS. 1 and 2). The cooling water passage 10a of the internal combustion engine body 10 and the cooling water passage 12a6 (see FIGS. 1 and 2) of the housing 12a (see FIGS. 1 and 2) of the compressor 12 (see FIGS. 1 and 2) are a third type. It is connected via a cooling water passage 21 (see FIG. 2) that functions as a cooling water passage.
In the example shown in FIG. 2 of the engine system to which the control device for the internal combustion engine of the first embodiment is applied, the water pump 20 is provided in the cooling water passage 21. The water pump 20 is connected to an ECU (electronic control unit) 50 that functions as a control device. An intake air temperature sensor 50a and a coolant temperature sensor 50b are connected to the ECU 50.

In the example shown in FIGS. 1 and 2 to which the control apparatus for an internal combustion engine of the first embodiment is applied, the intake air temperature sensor 50a (see FIG. 2) is connected to the intake passage 11 (see FIG. 1) upstream of the compressor 12 (see FIG. 1). 1). Further, the post-supercharging intake air temperature Ta, which is the temperature of the intake air in the intake passage 11 on the downstream side of the compressor 12, is detected by the intake temperature sensor 50a, for example, and the temperature of the intake air in the intake passage 11 on the upstream side of the compressor 12 is detected. ECU 50 based on the relationship between the pre-supercharging intake air temperature, the operating state of the internal combustion engine, and the pre-supercharging intake air temperature, the operating state of the internal combustion engine, and the post-supercharging intake air temperature Ta obtained in advance through experiments or the like. (See FIG. 2).
In another example to which the control device for an internal combustion engine of the first embodiment is applied, instead, the intake air temperature sensor 50a is disposed in the intake passage 11 on the downstream side of the compressor 12, and the post-supercharging intake air temperature Ta is set as the intake air temperature. It can also be detected by the sensor 50a.

In the example shown in FIG. 2 to which the control device for the internal combustion engine of the first embodiment is applied, the cooling water temperature sensor 50 b is arranged in the cooling water passage 10 a of the internal combustion engine body 10. Further, the temperature Tw of the cooling water in the cooling water passage 12a6 of the housing 12a of the compressor 12 is detected, for example, by the temperature of the cooling water in the cooling water passage 10a of the internal combustion engine body 10 detected by the cooling water temperature sensor 50b, and the internal combustion engine. By the ECU 50 based on the relationship between the operating state of the cooling water in the cooling water passage 10a, the operating state of the internal combustion engine, and the temperature Tw of the cooling water in the cooling water passage 12a6 obtained in advance through experiments or the like. Calculated.
In another example to which the control device for an internal combustion engine of the first embodiment is applied, instead, the cooling water temperature sensor 50b is arranged in the cooling water passage 12a6 of the housing 12a of the compressor 12, and the cooling water in the cooling water passage 12a6 is arranged. This temperature Tw can also be detected by the cooling water temperature sensor 50b. Alternatively, the cooling water temperature sensor 50b can be arranged at a position other than the cooling water passages 10a and 12a6, and the temperature Tw of the cooling water in the cooling water passage 12a6 can be produced by the same method as described above.

FIG. 3 is a flowchart for explaining cooling water flow control executed by the control apparatus for an internal combustion engine according to the first embodiment. The cooling water flow control shown in FIG. 3 is executed at predetermined time intervals, for example, during operation of the internal combustion engine.
When the cooling water flow control shown in FIG. 3 is started, the intake air after supercharging calculated by the ECU 50 (see FIG. 2) or detected by the intake air temperature sensor 50a (see FIG. 2) in step S1. The temperature Ta is read by the ECU 50, for example.
In step S1, the cooling of the housing 12a (see FIGS. 1 and 2) of the compressor 12 (see FIGS. 1 and 2) calculated by the ECU 50 or detected by the cooling water temperature sensor 50b (see FIG. 2). The temperature Tw of the cooling water in the water passage 12a6 (see FIGS. 1 and 2) is read by the ECU 50, for example.
Next, in step S2, for example, the ECU 50 determines whether the post-supercharging intake air temperature Ta is lower than a preset threshold value Tw1 such as 0 ° C., for example. If YES, it is determined that the intake air temperature needs to be raised, and the process proceeds to step S3. On the other hand, if NO, it is determined that there is no need to increase the intake air temperature, and the process proceeds to step S6.
In step S3, for example, the ECU 50 determines whether or not the temperature Tw of the cooling water in the cooling water passage 12a6 is higher than the post-supercharging intake air temperature Ta. If YES, it is determined that the intake air temperature can be raised by passing the cooling water, and the process proceeds to step S4. On the other hand, when the determination is NO, it is determined that the intake air temperature cannot be increased by the flow of the cooling water, and the process proceeds to step S5.
In step S4, the water pump 20 (see FIG. 2) is actuated by the ECU 50, and the coolant is passed through the coolant passage 12a6.

That is, in the example shown in FIG. 3 to which the control device for the internal combustion engine of the first embodiment is applied, the intake air in the intake passage 11 (see FIG. 1) on the downstream side of the compressor 12 (see FIG. 1) in step S2. It is determined that the temperature (the post-supercharging intake air temperature Ta) is lower than a preset threshold value Tw1, and the cooling water passage 12a6 (see FIG. 1) formed in the housing 12a (see FIG. 1) of the compressor 12 in step S3. In the first case where it is determined that the cooling water temperature Tw is higher than the post-supercharging intake air temperature Ta, in step S4, the cooling water is passed through the cooling water passage 12a6.
That is, in the example shown in FIG. 3 to which the control device for the internal combustion engine of the first embodiment is applied, for example, the temperature of the intake air supplied to the internal combustion engine body 10 (see FIG. 1) is increased because the outside air temperature is low. In the first case where the intake air whose temperature has been sufficiently increased cannot be supplied to the internal combustion engine body simply by increasing the intake air temperature by supercharging by the compressor 12, in step S4, after the supercharging The intake air in the housing 12a of the compressor 12 is heated by the cooling water having a temperature Tw higher than the intake air temperature Ta.
Therefore, in the example shown in FIG. 3 to which the control device for the internal combustion engine of the first embodiment is applied, the cooling water having a temperature lower than the post-supercharging intake air temperature Ta is passed through the cooling water passage 12a6. Or, since the cooling water having a temperature Tw higher than the post-supercharging intake air temperature Ta cannot be passed through the cooling water passage 12a6, the post-supercharging intake air temperature Ta can be increased, for example, because the outside air temperature is low. When it is necessary to increase the temperature of the intake air supplied to the internal combustion engine main body 10, the intake air whose temperature has been sufficiently increased can be supplied to the internal combustion engine main body 10.

Specifically, in the example shown in FIG. 1 and FIG. 3 to which the control device for an internal combustion engine of the first embodiment is applied, the intake air after the temperature rises due to compression by the compressor 12 (see FIG. 1) (high temperature excess). In the intake passage 11 (see FIG. 1) on the downstream side of the compressor 12, the intake air after being supplied) is not heated by the cooling water having a temperature higher than the intake air temperature after the supercharging, but is compressed by the compressor 12 so as to have a temperature. The intake air before rising (low-temperature supercharging intake air) is excessive in the housing 12a of the compressor 12 (specifically, in the upstream portion of the diffuser portion 12a5 (see FIG. 1) of the housing 12a). Heating is performed by cooling water having a temperature Tw higher than the post-supply intake air temperature Ta.
That is, in the example shown in FIG. 1 and FIG. 3 to which the control device for the internal combustion engine of the first embodiment is applied, the low-temperature pre-supercharging intake air is heated by the cooling water. The difference between the intake air temperature when the intake air is heated by the cooling water and the cooling water temperature can be made larger than when the intake water is heated by the cooling water.
Therefore, in the example shown in FIG. 1 and FIG. 3 to which the control device for the internal combustion engine of the first embodiment is applied, the intake air after high-temperature supercharging is heated by the cooling water (that is, the intake air is cooled by the cooling water). The intake air can be warmed by the cooling water more efficiently than the case where the difference between the intake air temperature and the cooling water temperature at the time of heating is small). As a result, the intake air is supplied to the internal combustion engine body 10 (see FIG. 1). The intake air temperature can be raised sufficiently.

In step S5, the water pump 20 (see FIG. 2) is controlled by the ECU 50 (see FIG. 2) so that the flow rate of the cooling water to the cooling water passage 12a6 (see FIGS. 1 and 2) is smaller than that in step S4. Is done.
In the example shown in FIGS. 2 and 3 to which the control device for the internal combustion engine of the first embodiment is applied, the control of the water pump 20 is changed (that is, the discharge amount of the water pump 20 is reduced) in step S5. As a result, the flow rate of the cooling water to the cooling water passage 12a6 is reduced, but in another example, for example, a bypass passage 23 (see FIG. 4) that bypasses the cooling water passage 12a6 is provided instead. By increasing the amount of cooling water that flows through the bypass passage 23, the amount of cooling water that flows through the cooling water passage 12a6 can also be reduced.

That is, in the example shown in FIG. 3 to which the control device for the internal combustion engine of the first embodiment is applied, it is determined in step S2 that the post-supercharging intake air temperature Ta is lower than the preset threshold value Tw1, and in step S3 the cooling is performed. In the second case where it is determined that the temperature Tw of the cooling water in the water passage 12a6 (see FIG. 1) is equal to or lower than the intake air temperature Ta after the supercharging, in step S5, the amount of cooling water flowing into the cooling water passage 12a6 is It is reduced more than in the first case (step S4).
That is, in the example shown in FIG. 3 to which the control device for the internal combustion engine of the first embodiment is applied, for example, the temperature of the intake air supplied to the internal combustion engine body 10 (see FIG. 1) is increased because the outside air temperature is low. Although it is necessary to carry out the cooling water flow to the cooling water passage 12a6 as in the first case (step S4), the temperature of the intake air supplied to the internal combustion engine body 10 may be reduced. In the second case, in step S5, the cooling water passage to the cooling water passage 12a6 is not executed, or the cooling water passage to the cooling water passage 12a6 is less than in the first case (step S4). It is executed with water flow.
Therefore, in the example shown in FIG. 3 to which the control device for the internal combustion engine of the first embodiment is applied, when the temperature of the intake air supplied to the internal combustion engine body 10 needs to be raised, the supply to the internal combustion engine body 10 is performed. The risk that the temperature of the intake air will be reduced can be reduced.

In step S6, it is determined, for example, by the ECU 50 (see FIG. 2) whether the post-supercharging intake air temperature Ta is higher than a preset threshold value Tw2 such as 170 ° C. to 180 ° C., for example. When YES, the intake air in the housing 12a (see FIGS. 1 and 2) of the compressor 12 (see FIGS. 1 and 2) can be cooled by the cooling water that has cooled the internal combustion engine body 10 (see FIG. 2). Judge and go to step S7. On the other hand, when NO, it is determined that the cooling water that has cooled the internal combustion engine body 10 cannot cool the intake air in the housing 12a of the compressor 12, and the process proceeds to step S8.
In step S7, the water pump 20 (see FIG. 2) is actuated by the ECU 50, and cooling water is passed through the cooling water passage 12a6 (see FIGS. 1 and 2). As a result, for example, the oil contained in the intake air at the time of high supercharging is carbonized in the housing 12a of the compressor 12 and deposits are prevented from deteriorating, thereby reducing the supercharging efficiency.
In step S8, the water pump 20 is controlled by the ECU 50 so that the amount of cooling water flowing into the cooling water passage 12a6 is reduced more than in step S7. As a result, deterioration of fuel consumption due to operation of the water pump 20 is suppressed.

  In another example to which the control device for an internal combustion engine of the first embodiment is applied, the flow rate of cooling water to the bypass passage 23 (see FIG. 4) is increased in step S8 as in the other examples described above. Accordingly, it is possible to reduce the amount of cooling water flowing into the cooling water passage 12a6.

  In the example shown in FIG. 1 to which the control device for an internal combustion engine of the first embodiment is applied, the cooling water passage 12a6 is formed in a portion of the housing 12a facing the compressor impeller 12b. In another example to which the control device for an internal combustion engine of the embodiment is applied, the cooling water passage 12a6 may be formed at an arbitrary position of the housing 12a that can cool the intake air before supercharging.

Hereinafter, a second embodiment of the control device for an internal combustion engine of the present invention will be described.
The main part of the engine system to which the control device for the internal combustion engine of the second embodiment is applied is the engine system to which the control device for the internal combustion engine of the first embodiment shown in FIG. It is configured almost the same as the main part. Therefore, according to the control apparatus for an internal combustion engine of the second embodiment, substantially the same effects as those of the control apparatus for the internal combustion engine of the first embodiment described above can be obtained except for the points described later.

FIG. 4 is a schematic block diagram of another main part of the engine system to which the control device for an internal combustion engine of the second embodiment is applied.
In the example shown in FIG. 2 to which the control device for an internal combustion engine of the first embodiment is applied, a bypass passage that bypasses the cooling water passage 12a6 of the housing 12a of the compressor 12 is not provided. In the example shown in FIG. 4 to which the control device for the internal combustion engine is applied, a bypass passage 23 that bypasses the cooling water passage 12a6 of the housing 12a of the compressor 12 is provided. Further, a heating device 24 for heating the cooling water bypassing the cooling water passage 12a6 is provided in the bypass passage 23, for example. Further, the water passing mode in which the cooling water that has passed through the cooling water passage 10a of the internal combustion engine body 10 flows into the cooling water passage 12a6 of the housing 12a of the compressor 12 and the cooling water that has passed through the cooling water passage 10a of the internal combustion engine body 10 are A valve 22 that switches between the bypass mode that bypasses the cooling water passage 12a6 and flows into the bypass passage 23 is provided.
In the example shown in FIG. 4 to which the control device for the internal combustion engine of the second embodiment is applied, the heating device 24 is provided in the bypass passage 23, but the control device for the internal combustion engine of the second embodiment is applied. In another example, the heating device 24 may be provided in the cooling water passage 21 instead.

FIG. 5 is a flowchart for explaining cooling water flow control executed by the control apparatus for an internal combustion engine according to the second embodiment. The cooling water flow control shown in FIG. 5 is executed at predetermined time intervals, for example, during operation of the internal combustion engine.
In steps S1, S2, S3, S4, S6, S7, and S8 in FIG. 5, the same processes as those in steps S1, S2, S3, S4, S6, S7, and S8 in FIG. 3 are executed.
When it is determined NO in step S3 of FIG. 5, even if the cooling water is passed through the cooling water passage 12a6 (see FIG. 4) of the housing 12a (see FIG. 4) of the compressor 12 (see FIG. 4), It is determined that the temperature of the intake air in the housing 12a of the compressor 12 cannot be raised, and the process proceeds to step S11.
In step S11, the valve 22 (see FIG. 4) is operated by the ECU 50 (see FIG. 4), and the cooling water that has passed through the cooling water passage 10a (see FIG. 4) of the internal combustion engine body 10 (see FIG. 4) From the water flow mode that flows into the cooling water passage 12a6 of the housing 12a, the cooling water that has passed through the cooling water passage 10a of the internal combustion engine body 10 bypasses the cooling water passage 12a6 and flows into the bypass passage 23 (see FIG. 4). Switching to the mode is executed.
That is, in the example shown in FIG. 5 to which the control device for the internal combustion engine of the second embodiment is applied, it is determined in step S2 that the post-supercharging intake air temperature Ta is lower than the preset threshold value Tw1, and cooling is performed in step S3. In the second case where it is determined that the temperature Tw of the cooling water in the water passage 12a6 is equal to or lower than the intake air temperature Ta after supercharging, the flow of the cooling water to the cooling water passage 12a6 is stopped in step S11.
Therefore, in the example shown in FIG. 5 to which the control device for an internal combustion engine of the second embodiment is applied, the internal combustion engine main body 10 (see FIG. 1 and FIG. 1) along with the flow of the cooling water through the cooling water passage 12a6. It is possible to avoid a decrease in the temperature of the intake air supplied to (see FIG. 4).

Next, in step S12, for example, the heating device 24 (see FIG. 4) is operated by the ECU 50 (see FIG. 4), and the cooling water bypassing the cooling water passage 12a6 (see FIG. 4) is heated by the heating device 24. .
That is, in the example shown in FIG. 5 to which the control device for an internal combustion engine of the second embodiment is applied, in the second case, the cooling water bypassing the cooling water passage 12a6 is heated in step S12.
Therefore, in the example shown in FIG. 5 to which the control device for an internal combustion engine of the second embodiment is applied, the temperature of the cooling water can be raised. As a result, after the temperature of the cooling water rises, the cooling water whose temperature has risen is passed through the cooling water passage 12a6 (that is, step S4 is executed), so that the cooling water is earlier than when the cooling water is not heated. The intake air whose temperature has been sufficiently increased can be supplied to the internal combustion engine body 10 (see FIGS. 1 and 4).

  In the example shown in FIG. 4 to which the control device for the internal combustion engine of the second embodiment is applied, for example, an electric heater is used as the heating device 24, but the control device for the internal combustion engine of the second embodiment is applied. In another example, any known device such as an exhaust heat recovery device that recovers and uses the heat of the exhaust gas of the internal combustion engine described in, for example, Japanese Patent No. 5772652 is used as the heating device 24. You can also.

  In the third embodiment, the above-described first and second embodiments and examples can be appropriately combined.

10 Internal combustion engine body 10a Cooling water passage 11 Intake passage 12 Compressor 12a Housing 12a1 Inlet passage 12a2 Scroll passage 12a3 Shroud portion 12a4 Shroud surface 12a5 Diffuser portion 12a6 Cooling water passage 12b Compressor impeller 12c Shaft 12c1 Center axis 20 Water pump 21 Cooling water passage 22 Valve 23 Bypass passage 24 Heating device 50 ECU
50a Intake air temperature sensor 50b Cooling water temperature sensor

Claims (3)

An internal combustion engine body;
An intake passage connected to the internal combustion engine body;
A compressor disposed in the intake passage;
A control device for an internal combustion engine comprising a first coolant passage formed in a housing of the compressor;
The intake air temperature after supercharging, which is the temperature of the intake air in the intake passage on the downstream side of the compressor, is lower than a preset threshold value, and the temperature of the cooling water in the first cooling water passage is the intake air after the supercharging. In the first case where the temperature is higher than the temperature, the cooling water is passed through the first cooling water passage,
When the post-supercharging intake air temperature is lower than the threshold value and the temperature of the cooling water in the first cooling water passage is equal to or lower than the post-supercharging intake air temperature, the cooling to the first cooling water passage is performed. The control apparatus for an internal combustion engine, characterized in that the amount of water flow is reduced as compared with the first case.   2. The internal combustion engine according to claim 1, wherein the first cooling water passage is disposed at a position facing the compressor impeller in the housing of the compressor or at a position upstream of the position. Engine control device. The internal combustion engine
A second cooling water passage formed in the internal combustion engine body;
A third cooling water passage connecting the first cooling water passage and the second cooling water passage;
A bypass passage for bypassing the first cooling water passage;
A heating device for heating the cooling water bypassing the first cooling water passage,
In the second case, the cooling water flow to the first cooling water passage is stopped, the cooling water flow to the bypass passage is executed, and the first cooling water passage is bypassed. The control apparatus for an internal combustion engine according to claim 1 or 2, wherein the cooling water is heated by the heating device.

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