JP2013148062A - Supercharging system for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supercharging system for an internal combustion engine, in which temperature elevation in a heat generating part of an electric supercharger is suppressed.SOLUTION: A supercharging system includes: an electric supercharger 4 disposed downstream from turbocompressor 3a of a turbocharger 3 and having an electric compressor 4a that is driven by an electric motor 4b and an inverter 4c; an intercooler 6 disposed downstream from electric supercharger 4; a bypass passage 8 downstream from turbocompressor 3a, the bypass passage communicating with the intercooler 6 by bypassing the electric compressor 4a; and a bypass valve 9 for variably setting an opening of the bypass passage 8. At least one of the electric motor 4b and the inverter 4c is disposed in an upstream flow passage of the turbocompressor 3a and cooled by air flowing in the upstream flow passage.

Description

  The present invention relates to a supercharging system for an internal combustion engine including a turbocharger and an electric supercharger, and more particularly to a cooling structure for an electric motor and an inverter incorporated in the electric supercharger.

Conventionally, as a technique for improving engine output, it is known to use a turbocharger that is driven by engine exhaust gas and pressurizes intake air.
However, since the amount of exhaust gas is small in the low engine speed range, there is a problem of so-called turbo lag in which the turbocharger is delayed in supercharging timing.

  Therefore, in order to solve the problem of the turbocharger in the low engine speed region, a technique for installing an electric supercharger driven by an electric motor in addition to the turbocharger has been proposed (for example, a patent) Reference 1).

  In the supercharging device described in Patent Document 1, an electric motor used for an electric supercharger requires several kW of motor output. For example, when using a battery of 12 V, several inverters are used to drive the electric motor. A large current of 100 amperes flows, and the large current increases the heat generation of the inverter, and the motor also rotates at a high speed of tens of thousands of rpm, so the heat generation due to mechanical loss increases.

  Therefore, it is necessary to provide a good cooling means for cooling the electric supercharger in order to suppress the temperature rise due to heat generation of the electric supercharger or the inverter within an allowable value. Cooling means for generators and inverters used in superchargers are not considered.

  Therefore, as a cooling device for the motor and inverter of the electric supercharger, a technique has been proposed in which the motor and the inverter are arranged in the upstream flow path of the electric compressor driven by the motor, and the motor and the inverter are cooled by the intake air of the electric compressor. (For example, refer to Patent Document 2).

Japanese Patent Laying-Open No. 2005-42552 JP 2008-215075 A

  In the conventional supercharging system for an internal combustion engine, in the case of the technology described in Patent Document 2, when the electric supercharger is stopped, no intake air is performed and the electric motor and the inverter cannot be cooled. There is a problem in that it is necessary to idle the electric supercharger, and power of the battery is wasted during idling for cooling.

  Further, Patent Document 2 discloses a technique of operating a separately provided fan and taking in cooling air when idling of the electric supercharger is impossible. In addition to causing an increase in size, there is a problem that more power is required to operate the fan.

  The present invention has been made to solve the above-described problems, and is for an internal combustion engine capable of suppressing the temperature rise of the motor and the inverter of the electric supercharger while maintaining the improvement of the engine output. The purpose is to obtain a supercharging system.

  A supercharging system for an internal combustion engine according to the present invention includes a turbocharger having a turbo compressor and a turbine, and an electric supercharger having an electric compressor provided in a downstream flow path of the turbo compressor and driven by an electric motor and an inverter. An intercooler disposed between the downstream side of the electric compressor and the intake side of the engine, a bypass passage that bypasses the electric compressor from the downstream side of the turbo compressor and communicates with the intercooler, and an opening degree of the bypass passage. In a supercharging system for an internal combustion engine including a variably set bypass valve, at least one of the electric motor and the inverter is disposed in an upstream flow path of the turbo compressor.

  According to the present invention, by providing the means for cooling the electric motor and the inverter of the electric supercharger using the intake air of the turbo compressor, while maintaining the improvement of the engine output, The temperature rise of the inverter can be suppressed.

It is a block diagram which shows the state at the time of electric supercharger operation | movement of the supercharging system for internal combustion engines which concerns on Embodiment 1 of this invention. It is a block diagram which shows the state at the time of the electric supercharger non-operation of the supercharging system for internal combustion engines which concerns on Embodiment 1 of this invention. It is a block diagram which shows the state at the time of electric supercharger operation | movement of the supercharging system for internal combustion engines which concerns on Embodiment 2 of this invention. It is a block diagram which shows the state at the time of the electric supercharger non-operation of the supercharging system for internal combustion engines which concerns on Embodiment 2 of this invention. It is a block diagram which shows the state at the time of electric supercharger operation | movement of the supercharging system for internal combustion engines which concerns on Embodiment 3 of this invention. It is a block diagram which shows the state at the time of the electric supercharger non-operation of the supercharging system for internal combustion engines which concerns on Embodiment 3 of this invention. It is a block diagram which shows the state at the time of the electric supercharger operation | movement of the supercharging system for internal combustion engines which concerns on Embodiment 4 of this invention.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings.
1 and 2 are block diagrams showing a supercharging system for an internal combustion engine according to Embodiment 1 of the present invention. FIG. 1 shows a state when the electric supercharger is in operation, and FIG. The state at the time of operation is shown.

  1 and 2, an internal combustion engine supercharging system including a supercharging device includes an air cleaner 1 provided in an intake flow path 2 on the uppermost stream side, and a turbocharger 3 having a turbo compressor 3a and a turbine 3b. An electric supercharger 4 having an electric compressor 4a driven by an electric motor 4b and an inverter 4c, an upstream flow path 5 of the electric compressor 4a from the turbo compressor 3a to the electric compressor 4a, the turbocharger 3 and the electric The intercooler 6 that cools the supply air (solid arrow) via the supercharger 4, the engine 7 that is supplied with the supply air via the intercooler 6, and the turbo compressor 3 a and the intercooler 6 communicate with each other. A bypass passage 8, a bypass valve 9 for opening and closing the bypass passage 8, and an exhaust passage 20 for discharging exhaust gas (broken arrows) of the engine 7 , And a.

The turbine 3b of the turbocharger 3 is disposed in the exhaust passage 20 and is driven by exhaust gas (broken arrows) from the engine 7 to rotationally drive a turbo compressor 3a coaxial with the turbine 3b.
On the other hand, the electric compressor 4a of the electric supercharger 4 is rotationally driven by the electric motor 4b and the inverter 4c.

  The electric motor 4b and the inverter 4c of the electric supercharger 4 are disposed in the intake flow path 2 that is the upstream flow path of the turbo compressor 3a. As a result, the air supplied via the air cleaner 1 passes through the heat generating portions of the electric motor 4b and the inverter 4c and reaches the inlet of the turbo compressor 3a of the turbocharger 3.

In FIG. 1, the electric motor 4 b and the inverter 4 c of the electric supercharger 4 are integrated, but may have different configurations.
Moreover, although both the electric motor 4b and the inverter 4c are arrange | positioned in the intake flow path 2, you may arrange | position only any one.

  On the downstream side of the turbo compressor 3a, not only the upstream flow path 5 leading to the electric compressor 4a of the electric supercharger 4 but also the intercooler 6 is communicated without passing through the electric compressor 4a of the electric supercharger 4. A bypass passage 8 is in communication. The bypass passage 8 is provided with a bypass valve 9 for adjusting the opening degree of the bypass passage 8.

When the rotational speed of the engine 7 is low, the exhaust gas energy from the engine 7 is small, so that the bypass passage 8 is closed and the electric turbocharger 4 as well as the turbocharger 3 is connected as shown in FIG. Make it work.
Thereby, the engine 7 is supercharged using both the electric supercharger 4 and the turbocharger 3, and the turbo lag of the turbocharger 3 is suppressed.

  As described above, by operating both the electric supercharger 4 and the turbocharger 3, air from the intake air of the turbo compressor 3 a and the electric compressor 4 a flows into the intake passage 2 and is arranged in the intake passage 2. It becomes possible to cool the heat generating part (the electric motor 4b and the inverter 4c) of the electric supercharger 4 thus made.

  When the electric supercharger 4 is in operation, the bypass flow path 8 is normally closed by setting the bypass valve 9 to the closed position. Thus, the air supply (solid arrow) that has passed through the turbo compressor 3 a flows through the upstream flow path 5 and is sent to the electric compressor 4 a of the electric supercharger 4.

At this time, the temperature of the supply air compressed by the turbo compressor 3a of the turbocharger 3 and the electric compressor 4a of the electric supercharger 4 rises in temperature.
Therefore, in order to improve efficiency, the compressed air supply is cooled and supercharged to the engine 7 by interposing the intercooler 6 before the air is supplied to the engine 7.

  On the other hand, when the rotational speed of the engine 7 increases and the exhaust gas energy to the turbine 3b of the turbocharger 3 increases, the electric supercharger 4 is stopped and the bypass passage 8 is opened as shown in FIG.

  At this time, even if the electric supercharger 4 is not in operation, the turbocharger 3 is operating with exhaust gas energy, so that air from the intake air of the turbo compressor 3a flows into the intake passage 2 and the intake passage 2 It becomes possible to cool the heat generating parts of the electric motor 4b and the inverter 4c arranged in the inverter 4c.

Further, when the electric supercharger 4 is not in operation, the air compressed by the turbo compressor 3a of the turbocharger 3 is caused to pass to the bypass passage 8 side by opening the bypass valve 9 as shown in FIG.
Thereby, it can prevent that the upstream flow path 5 and the electric compressor 4a of the electric supercharger 4 become intake resistance (pressure loss).

  As described above, the supercharging system for an internal combustion engine according to Embodiment 1 (FIGS. 1 and 2) of the present invention includes the turbocharger 3 having the turbo compressor 3a and the turbine 3b, and the downstream side of the turbo compressor 3a. An electric supercharger 4 having an electric compressor 4a provided in the flow path and driven by an electric motor 4b and an inverter 4c; an intercooler 6 disposed between the downstream side of the electric compressor 4a and the intake side of the engine 7; A bypass passage 8 that bypasses the electric compressor 4a from the downstream side of the turbo compressor 3a and communicates with the intercooler 6, and a bypass valve 9 that variably sets the opening degree of the bypass passage 8, and includes an electric motor 4b and an inverter 4c ( (At least one) is disposed in the upstream flow path of the turbo compressor 3a.

  As described above, by arranging the electric motor 4b and the inverter 4c in the upstream flow path of the turbo compressor 3a, the electric motor 4b and the inverter 4c can flow through the upstream flow path regardless of the driving state of the electric compressor 4a ( It is cooled effectively by the low-temperature supply air sucked from outside air).

That is, by providing means (intake air passage 2) for cooling the electric motor 4b and the inverter 4c of the electric supercharger 4 using the intake air of the turbo compressor 3a, the improvement of the output of the engine 7 is maintained. The temperature rise of the electric motor 4b and the inverter 4c of the electric supercharger 4 can be suppressed.
Further, when one of the electric motor 4b or the inverter 4c is disposed in the intake flow path 2, the temperature rise can be similarly suppressed.

Embodiment 2. FIG.
In the first embodiment (FIGS. 1 and 2), the electric motor 4b and the inverter 4c are arranged in the upstream flow path of the turbo compressor 3a. However, as shown in FIGS. 3 and 4, the downstream of the turbo compressor 3a. You may arrange | position in the upstream flow path 5 from the intercooler 6a inserted in the side to the electric compressor 4a.

  3 and 4 are block diagrams showing a supercharging system for an internal combustion engine according to Embodiment 2 of the present invention. FIG. 3 is a state when the electric supercharger is operating, and FIG. 4 is a non-operating state of the electric supercharger. It shows the state of the hour. In each figure, the same components as those described above (FIGS. 1 and 2) are denoted by the same reference numerals as those described above, and detailed description thereof is omitted.

  3 and 4, a first intercooler 6a (hereinafter simply referred to as a first intercooler 6a) for cooling air that has been compressed by the turbo compressor 3a and has risen in temperature is provided in a downstream flow path of the turbo compressor 3a of the turbocharger 3. "Intercooler 6a") is provided.

  In addition, the heat generating portion (the electric motor 4b and the inverter 4c) of the electric supercharger 4 is disposed in the downstream flow path 11 of the intercooler 6a. An upstream flow path 5 that reaches the electric compressor 4a of the feeder 4, a bypass passage 8 that does not pass through the electric compressor 4a, and communicates with a second intercooler 6 (hereinafter simply referred to as “intercooler 6”); Is provided.

3 and 4, when at least the turbocharger 3 of the turbocharger 3 and the electric supercharger 4 is operated, the intake air flows into the intake passage 2 and passes through the air cleaner 1. The supplied air reaches the inlet of the turbo compressor 3a of the turbocharger 3.
Thereby, the air cooled by the intercooler 6a can cool the heat generating portions of the electric motor 4b and the inverter 4c.

  When the electric supercharger 4 is in operation, the bypass valve 9 is normally closed and the bypass flow path 8 is closed as shown in FIG. Thereby, the air supply (solid arrow) that has passed through the electric motor 4 b and the inverter 4 c reaches the electric compressor 4 a of the electric supercharger 4.

As described above, since the exhaust gas energy is low when the engine 7 is running at a low speed, the bypass passage 8 is closed and the turbocharger 3 as well as the electric supercharger 4 is operated as shown in FIG. Let
As a result, the electric supercharger 4 and the turbocharger 3 supercharge the engine 7 to suppress turbo lag.

  Further, since the air supply to the electric compressor 4a is cooled by the intercooler 6, heat generation of the electric compressor 4a can be suppressed, and heat received from the electric compressor 4a to the electric motor 4b and the inverter 4c can be reduced. Is possible. Thereby, the cooling effect of the electric motor 4b and the inverter 4c can further be improved.

  In addition, since the temperature of the supply air compressed by the electric compressor 4a of the electric supercharger 4 rises again, the intercooler 6 is interposed before being supplied to the engine 7 in order to improve efficiency. Then, the compressed supply air is cooled and supercharged to the engine 7.

  On the other hand, when the rotational speed of the engine 7 increases and the exhaust gas energy to the turbine 3b of the turbocharger 3 increases, the electric supercharger 4 is stopped and the bypass passage 8 is opened as shown in FIG.

  At this time, even if the electric supercharger 4 is not in operation, the turbocharger 3 is operated by the exhaust gas energy, so that air supply (solid arrow) flows through the intake flow path 2 and the downstream flow path 11. It becomes possible to cool the heat generating portions of the electric motor 4b and the inverter 4c arranged in the downstream flow path 11.

Further, when the electric supercharger 4 is not in operation, the air supply compressed by the turbo compressor 3a of the turbocharger 3 is routed to the bypass passage 8 side by opening the bypass valve 9 as shown in FIG.
Thereby, it can prevent that the electric compressor 4a of the electric supercharger 4 becomes an intake resistance (pressure loss).

  As described above, the supercharging system for an internal combustion engine according to Embodiment 2 (FIGS. 3 and 4) of the present invention includes the turbocharger 3 having the turbo compressor 3a and the turbine 3b, and the downstream side of the turbo compressor 3a. An electric supercharger 4 having an electric compressor 4a provided in the flow path and driven by an electric motor 4b and an inverter 4c; an intercooler 6a disposed between the downstream side of the turbo compressor 3a and the electric compressor 4a; An intercooler 6 disposed between the downstream side of the compressor 4a and the intake side of the engine 7, and a bypass passage 8 that bypasses the electric compressor 4a from the downstream side of the electric motor 4b and the inverter 4c and communicates with the intercooler 6. A bypass valve 9 for variably setting the opening degree of the bypass passage 8, and an electric motor 4b and an inverter 4c. At least one) is disposed on the upstream side passage 5 of the electric compressor 4a extending from the intercooler 6a to the electric compressor 4a.

Thus, by arranging the electric motor 4b and the inverter 4c of the electric supercharger 4 between the intercooler 6a and the upstream flow path 5 of the electric supercharger 4, the upstream flow after cooling by the intercooler 6a. The motor 4b and the inverter 4c can be effectively cooled by the air flowing through the path 5.
Similarly to the above, when one of the electric motor 4b or the inverter 4c is disposed in the upstream flow path 5, the temperature rise can be similarly suppressed.

Embodiment 3 FIG.
In the first embodiment (FIGS. 1 and 2), the electric compressor 4a is arranged on the downstream side of the turbo compressor 3a. However, as shown in FIGS. 5 and 6, the electric compressor 4a is arranged on the upstream side of the turbo compressor 3a. The bypass passage 8 may be provided so as to communicate between the electric motor 4b and the inverter 4c and the turbo compressor 3a.

  5 and 6 are block diagrams showing a supercharging system for an internal combustion engine according to Embodiment 3 of the present invention. FIG. 5 is a state when the electric supercharger is operating, and FIG. 6 is a non-operating state of the electric supercharger. It shows the state of the hour. In each figure, the same components as those described above (FIGS. 1 and 2) are denoted by the same reference numerals as those described above, and detailed description thereof is omitted.

  5 and 6, the electric compressor 4a is disposed on the upstream side of the turbo compressor 3a, and the bypass passage 8 bypasses the electric compressor 4a from the downstream side of the electric motor 4b and the inverter 4c, and is upstream of the turbo compressor 3a. Communicating with

  That is, on the downstream side of the electric motor 4b and the inverter 4c, the turbocharger 3 does not pass through the upstream flow path 5 leading to the electric compressor 4a of the electric supercharger 4 and the electric compressor 4a of the electric supercharger 4. A bypass passage 8 communicating with the upstream side of the turbo compressor 3 a is provided, and a bypass valve 9 for opening and closing the bypass passage 8 is interposed in the bypass passage 8.

Moreover, the heat generating portion (the electric motor 4b and the inverter 4c) of the electric supercharger 4 is disposed in the upstream flow path 5 of the electric compressor 4a.
That is, the electric motor 4b and the inverter 4c are located at a passing point from the intake flow path 2 to the upstream flow path 5 of the electric compressor 4a, and are located upstream of the bypass path 8.
Furthermore, the intercooler 6 is provided in the downstream flow path of the turbo compressor 3a.

As described above, when the engine 7 is running at a low speed, the exhaust gas energy is small. Therefore, as shown in FIG. 5, the bypass passage 8 is closed and the turbocharger 3 as well as the electric supercharger 4 is operated. Let
Thereby, the electric supercharger 4 and the turbocharger 3 are used to supercharge the engine 7 to suppress the turbo lag.

  As described above, when both the turbocharger 3 and the electric supercharger 4 are operated, the supply air by the intake air flows into the intake passage 2, and the electric motor disposed in the downstream passage of the intake passage 2. It becomes possible to cool the heat generating part (the electric motor 4b and the inverter 4c) of the supercharger 4.

  In the downstream flow path of the turbocharger 3, the intercooler 6 cools the supply air that has been compressed by the electric compressor 4 a and the turbo compressor 3 a and has risen in temperature, and then supercharges the engine 7.

  On the other hand, when the rotational speed of the engine 7 increases and the exhaust gas energy to the turbine 3b of the turbocharger 3 increases, the electric supercharger 4 is stopped and the bypass passage 8 is opened as shown in FIG.

  At this time, even if the electric supercharger 4 is not in operation, the turbocharger 3 is operated by exhaust gas energy, so that air flows into the intake passage 2 due to the intake air of the turbocharger 3, and the electric motor 4b and the heat generating part of the inverter 4c can be cooled even when the electric supercharger 4 is not in operation.

Further, when the electric supercharger 4 is not in operation, the bypass valve 9 is opened as shown in FIG. 6 to bypass the supply of air from the air cleaner 1 via the heat generating portion (the electric motor 4b and the inverter 4c) of the electric supercharger 4. It is introduced into the passage 8.
Thereby, it can prevent that the electric compressor 4a and the upstream flow path 5 of the electric supercharger 4 become intake resistance (pressure loss).

  As described above, the supercharging system for an internal combustion engine according to Embodiment 3 (FIGS. 5 and 6) of the present invention includes the turbocharger 3 having the turbo compressor 3a and the turbine 3b, and the upstream side of the turbo compressor 3a. An electric supercharger 4 having an electric compressor 4a provided in the flow path and driven by an electric motor 4b and an inverter 4c; an intercooler 6 disposed between the downstream side of the electric compressor 4a and the intake side of the engine 7; A bypass passage 8 that bypasses the electric compressor 4a from the downstream side of the motor 4b and the inverter 4c and communicates with the upstream side of the turbo compressor 3a, and a bypass valve 9 that variably sets the opening of the bypass passage 8; 4b and the inverter 4c (at least one) are arrange | positioned in the upstream flow path 5 of the electric compressor 4a.

As described above, by providing the electric motor 4b and the inverter 4c on the upstream side of the upstream flow path 5 and the bypass passage 8 of the electric compressor 4a, the effect is obtained by the intake air from the outside air flowing in the upstream flow path 5 or the bypass passage 8. Can be cooled.
Similarly to the above, when one of the electric motor 4b or the inverter 4c is disposed in the upstream flow path 5, the temperature rise can be similarly suppressed.

Embodiment 4 FIG.
In the first to third embodiments (FIGS. 1 to 6), control means for the electric supercharger 4 and the bypass valve 9 is not mentioned, but as shown in FIG. An electronic control unit 13 (hereinafter abbreviated as “ECU 13”) for controlling the valve 9 may be provided.

FIG. 7 is a block diagram showing a state of the supercharger system for an internal combustion engine according to Embodiment 4 of the present invention when the electric supercharger is operating. A detailed description is omitted with reference numerals.
In addition, although the example applied to the structure of FIG. 1 was shown here typically, it cannot be overemphasized that it is applicable to another structure.

  In FIG. 7, the electric supercharger 4 is provided with a temperature detection means 12, and the temperature detection means 12 detects the temperature of at least one of the electric motor 4 b and the inverter 4 c and inputs the detected temperature T <b> 4 to the ECU 13. To do.

  When the detected temperature T4 of the temperature detecting means 12 reaches a predetermined temperature (corresponding to the heat generation limit temperature), the ECU 13 generates a control command C4 to stop the electric supercharger 4 and generates a control command C9. Then, the bypass valve 9 is controlled to be opened.

  In the above-described first to third embodiments, the bypass valve 9 is closed / opened in accordance with the operating / non-operating state of the electric supercharger 4, but depending on the use environment, the electric supercharger 4 The motor 4b and the inverter 4c may reach the heat generation limit temperature even when the engine 7 is rotating at a low speed.

  In the state of FIG. 7, the ECU 13 normally cools the heat generating portions of the electric motor 4 b and the inverter 4 c using the air supplied by the operation of the turbo compressor 3 a and the electric compressor 4 a, but the detected temperature T4 of the temperature detecting means 12 is When the heat generation limit temperature is likely to be reached, the electric supercharger 4 is stopped by the control command C4, and the bypass valve 9 is opened by the control command C9 to supercharge only the turbocharger 3.

As a result, the motor 4b and the inverter 4c of the electric supercharger 4 can be avoided from being overheated, and the motor 4b and the inverter 4c can be protected.
In addition, even when the temperature detection unit 12 and the ECU 13 of FIG. 7 are applied to the configuration of FIG. 3 or FIG. 5, the same effect can be obtained.

As described above, the supercharging system for an internal combustion engine according to the fourth embodiment (FIG. 7) of the present invention includes the ECU 13 that controls the electric supercharger 4 and the bypass valve 9.
The ECU 13 closes the bypass valve 9 during operation of the electric compressor 4a, cools at least one of the electric motor 4b and the inverter 4c by the intake air flow of the electric compressor 4a and the turbo compressor 3a, and bypasses the bypass valve 9 when the electric compressor 4a is stopped. And at least one of the electric motor 4b and the inverter 4c is cooled by the intake air flow of the turbo compressor 3a.

  Further, the internal combustion engine supercharging system according to Embodiment 4 of the present invention includes temperature detecting means 12 for detecting the temperature of at least one of the electric motor 4b and the inverter 4c, and the ECU 13 detects the temperature T4 detected by the temperature detecting means 12. When the temperature reaches a predetermined temperature, the electric compressor 4a is stopped, the bypass valve 9 is opened, and the electric motor 4b and the inverter 4c are cooled by the intake air flow of the turbo compressor 3a.

As a result, even when the electric supercharger 4 is normally operated, it is possible to reliably protect the electric motor 4b and the inverter 4c by avoiding the overheating state of the electric motor 4b and the inverter 4c.
In addition, in the said Embodiment 1-4, although the case where the electric motor 4b and the inverter 4c of the electric supercharger 4 were integrated was shown, the same effect is acquired even when it becomes a respectively separate structure. Needless to say.

  DESCRIPTION OF SYMBOLS 1 Air cleaner, 2 intake flow path (upstream flow path of turbo compressor), 3 turbocharger, 3a turbo compressor, 3b turbine, 4 electric supercharger, 4a electric compressor, 4b electric motor, 4c inverter, 5 electric compressor Upstream flow path, 6 intercooler (second intercooler), 6a intercooler (first intercooler), 7 engine, 8 bypass path, 9 bypass valve, 11 downstream flow path of intercooler, 12 temperature detection Means, 13 ECU, 20 Exhaust flow path, C4, C9 control command, T4 detected temperature.

A supercharging system for an internal combustion engine according to the present invention includes a turbocharger having a turbo compressor and a turbine, and an electric supercharger having an electric compressor provided in a downstream flow path of the turbo compressor and driven by an electric motor and an inverter. An intercooler disposed between the downstream side of the electric compressor and the intake side of the engine, a bypass passage that bypasses the electric compressor from the downstream side of the turbo compressor and communicates with the intercooler, and an opening degree of the bypass passage. In the supercharging system for an internal combustion engine provided with a variably set bypass valve, at least one of the electric motor and the inverter is disposed adjacent to the turbo compressor in the upstream flow path of the turbo compressor .

Claims (6)

A turbocharger having a turbo compressor and a turbine;
An electric supercharger having an electric compressor provided in a downstream flow path of the turbo compressor and driven by an electric motor and an inverter;
An intercooler disposed between the downstream side of the electric compressor and the intake side of the engine;
A bypass passage that bypasses the electric compressor from the downstream side of the turbo compressor and communicates with the intercooler;
A bypass valve for variably setting the opening of the bypass passage;
In a supercharging system for an internal combustion engine comprising:
The supercharging system for an internal combustion engine, wherein at least one of the electric motor and the inverter is disposed in an upstream flow path of the turbo compressor. A turbocharger having a turbo compressor and a turbine;
An electric supercharger having an electric compressor provided in a downstream flow path of the turbo compressor and driven by an electric motor and an inverter;
A first intercooler disposed between the downstream side of the turbo compressor and the electric compressor;
A second intercooler disposed between the downstream side of the electric compressor and the intake side of the engine;
A bypass passage that bypasses the electric compressor from the downstream side of the electric motor and the inverter and communicates with the second intercooler;
A bypass valve for variably setting the opening of the bypass passage;
In a supercharging system for an internal combustion engine comprising:
The supercharging system for an internal combustion engine, wherein at least one of the electric motor and the inverter is disposed in an upstream flow path of the electric compressor from the first intercooler to the electric compressor. A turbocharger having a turbo compressor and a turbine;
An electric supercharger having an electric compressor provided in an upstream flow path of the turbo compressor and driven by an electric motor and an inverter;
An intercooler disposed between the downstream side of the electric compressor and the intake side of the engine;
A bypass passage that bypasses the electric compressor from the downstream side of the electric motor and the inverter and communicates with the upstream side of the turbo compressor;
A bypass valve for variably setting the opening of the bypass passage;
In a supercharging system for an internal combustion engine comprising:
The supercharging system for an internal combustion engine, wherein at least one of the electric motor and the inverter is disposed in an upstream flow path of the electric compressor.   The supercharging system for an internal combustion engine according to any one of claims 1 to 3, further comprising an ECU that controls the electric supercharger and the bypass valve. The ECU
During the operation of the electric compressor, the bypass valve is closed, and at least one of the electric motor and the inverter is cooled by the intake air flow of the electric compressor and the turbo compressor,
5. The supercharging system for an internal combustion engine according to claim 4, wherein when the electric compressor is stopped, the bypass valve is opened, and at least one of the electric motor and the inverter is cooled by an intake air flow of the turbo compressor. Temperature detecting means for detecting the temperature of at least one of the electric motor and the inverter;
The ECU
When the temperature detected by the temperature detection means reaches a predetermined temperature, the electric compressor is stopped and the bypass valve is opened to cool the electric motor and the inverter by the intake air flow of the turbo compressor. The supercharging system for an internal combustion engine according to claim 4 or 5.

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