JP7323000B1 - Air supply system and air supply device - Google Patents

Abstract

An object of the present invention is to facilitate securing of a space for mounting an electric supercharger. An air supply system for supplying air to an engine mounted on a vehicle includes air cleaning means (21) for removing foreign matter from air taken in from the outside of the vehicle, and a housing of the air cleaning means (21) integrated with the air cleaning means (21). and an air blowing means 22 for blowing out the cleaned air from which foreign matter has been removed to the engine by rotation of an electric fan 222. - 特許庁The air supply system has a first route for transporting the cleaned air that has not passed through the air blowing means 22 to the engine while the electric fan 222 is not rotating, and a first route for transporting the air blowing means while the electric fan is rotating. and a second path for transporting the passed cleaned air to the engine. [Selection drawing] Fig. 3

Description

The present invention relates to an air supply system and an air supply device for supplying air to a vehicle engine.

BACKGROUND ART A supercharger is used to apply supercharging pressure to air supplied to an in-vehicle engine. For example, Patent Literature 1 describes that an electric supercharger is used to improve responsiveness mainly during start-up and acceleration.

JP 2013-108479 A

The electric supercharger described in Patent Literature 1 has a problem that the electric fan consumes a large amount of power because the electric motor is used to drive the electric fan. For this reason, an electric supercharger having an electric fan may be used, but there is a problem that it is difficult to secure a space for the electric fan to rotate.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air supply system capable of facilitating securing of a space for mounting an electric supercharger.

An air supply system according to a first aspect of the present invention is an air supply system for supplying air to an engine mounted on a vehicle, comprising: air cleaning means for removing foreign matter from air taken in from outside the vehicle; and an air blower that is integrated with the housing of the air cleaner and sends out the cleaned air from which the foreign matter has been removed to the engine by rotating an electric fan. The air supply system includes a first route for transporting the cleaned air that has not passed through the air blowing means to the engine while the electric fan is not rotating, and and a second route for transporting the cleaned air that has passed through the air blowing means to the engine.

The air supply system may further include a valve for preventing the cleaned air transported from the second route from flowing into the first route. The air supply system may further include supercharging means for compressing the air that has passed through the electric fan and supplying the air to the engine.

The air supply system further includes: a pressure sensor that measures the pressure of air supplied to the engine; You may prepare.

The controller may determine the amount of electric power to be supplied to the blower based on a difference between the pressure and the target pressure value. The control unit may determine the pressure target value based on a remaining amount of a battery that supplies power to the air blower. The air supply system includes an oxygen sensor that measures the oxygen concentration of the air supplied to the engine, a controller that rotates the electric fan of the air blower when the oxygen concentration is equal to or lower than a concentration target value, and may be further provided. The control unit may determine the concentration target value based on a remaining amount of a battery that supplies power to the air blower.

An air supply device according to a second aspect of the present invention is an air supply device for supplying air to an engine mounted on a vehicle, comprising: air cleaning means for removing foreign matter from air taken in from the outside of the vehicle; and an air blower that is integrated with the housing of the air cleaner and sends out the cleaned air from which the foreign matter has been removed to the engine by rotating an electric fan.

ADVANTAGE OF THE INVENTION According to this invention, there exists an effect of facilitating ensuring of the space which mounts an electric supercharger.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline|summary of the air supply apparatus of embodiment. It is a schematic diagram which shows the structure of an air supply apparatus. It is a schematic diagram which shows the structure of an air supply apparatus. 4 shows the relationship between the power supplied to the motor of the blower and the pressure of the cleaned air supplied to the engine 1. FIG. 4 is a flow chart showing a processing procedure for supplying air to the engine 1 by an air supply system;

[Configuration of Air Supply System 100]
FIG. 1 is a diagram showing an outline of an air supply device 2 of this embodiment. FIG. 1 shows the configuration of an air supply system 100 including an air supply device 2 of this embodiment. As shown in FIG. 1, an air supply system 100 includes an engine 1, an air supply device 2, a compressor 3 (corresponding to supercharging means), a turbine 4, an intake air cooler 5, an intake manifold 6, EGR (Exhaust Gas Recirculation, exhaust A gas recirculation) cooler 7, an EGR valve 8, a MAF sensor 9, a pressure sensor 10, a fuel injection nozzle 11, a rotation speed sensor 12, a storage section 13 and a control section 14 are provided.

An engine 1 is mounted on a vehicle. Engine 1 is, for example, a diesel engine. The air supply device 2 is a device that supplies air to the engine 1 . Details of the air supply device 2 will be described later.

The compressor 3 pressurizes the air that has passed through the electric fan 222 and supplies it to the engine. Compressor 3 and turbine 4 constitute a turbocharger. In this turbocharger, the turbine 4 is rotated by the exhaust gas from the engine 1, and the compressor 3 rotates integrally with the turbine 4 to compress the cleaned air, and the compressed cleaned air is supplied to the engine 1. supply. The intake air cooler 5 cools the cleaned air that has been compressed by the compressor 3 and heated to a high temperature.

The intake manifold 6 guides the cleaned air cooled by the intake air cooler 5 to the cylinders of the engine 1 . The EGR cooler 7 and the EGR valve 8 are designed to return part of the exhaust gas from the engine 1 to the engine 1 to recirculate the exhaust gas for the purpose of reducing the concentration of nitrogen oxides contained in the exhaust gas. It is a device. The EGR valve 8 is a valve for adjusting the amount of exhaust gas returned to the engine 1 . The EGR valve 8 adjusts the amount of exhaust gas returned to the engine 1 by opening to the EGR valve opening indicated by the control unit 14 .

A MAF (Mass flow sensor, air flow rate) sensor 9 measures the flow rate of air supplied to the engine 1 . The MAF sensor 9 is composed of, for example, multiple sensors. The MAF sensor 9 also functions as an oxygen sensor that measures the oxygen concentration of air supplied to the engine 1 . A pressure sensor 10 measures the pressure of the cleaned air supplied to the engine 1 . The fuel injection nozzle 11 injects fuel with increased pressure into the cylinder of the engine 1 . The fuel injection nozzle 11, for example, injects fuel in an amount corresponding to the accelerator opening detected by the accelerator pedal opening sensor. A rotation speed sensor 12 measures the rotation speed of the engine 1 .

The storage unit 13 is composed of, for example, a ROM (Read Only Memory) and a RAM (Random Access Memory). In the example of this specification, the storage unit 13 is included in an ECU (Electronic Control Unit). The storage unit 13 stores various programs and various data for causing the control unit 14 to function. The storage unit 13 stores, for example, a data table that associates the engine torque, the fuel injection amount from the fuel injection nozzle 11, the engine speed, and the EGR valve opening.

The control unit 14 is, for example, a processor included in the ECU. The controller 14 electronically controls each part of the air supply system 100 by executing a program. The control unit 14 acquires the oxygen concentration measured by the MAF sensor 9 . The control unit 14 acquires the pressure of the cleaned air measured by the pressure sensor 10 . The control unit 14 acquires the accelerator opening detected by an accelerator pedal opening sensor (not shown). The control unit 14 acquires the rotation speed of the engine 1 measured by the rotation speed sensor 12 .

The control unit 14 calculates the fuel injection amount to be injected by the fuel injection nozzle 11 based on the acquired accelerator opening, the climbing ratio of the road surface on which the vehicle is running, and the load weight of the luggage mounted on the vehicle. do. The control unit 14 may calculate the fuel injection amount based on the rotation speed of the engine 1 measured by the rotation speed sensor 12 in addition to the accelerator opening, the climbing ratio, and the load weight. The control unit 14 also calculates the engine torque based on the rotation speed of the engine 1 measured by the rotation speed sensor 12 .

The control unit 14 specifies the EGR valve opening degree for opening the EGR valve 8 . More specifically, the control unit 14 stores the fuel injection amount calculated with reference to the data table stored in the storage unit 13, the acquired engine speed, and the calculated engine torque in association with each other. Identify the EGR valve opening. The control unit 14 executes exhaust gas recirculation for returning the exhaust gas to the engine 1 by opening the EGR valve 8 at the specified EGR valve opening degree.

By the way, although the cleaned air compressed by the compressor 3 is supplied to the engine 1, the pressure of the cleaned air supplied to the engine 1 and the oxygen Concentration may be insufficient. For this reason, when the pressure or oxygen concentration of the cleaned air does not reach the target value, the control unit 14 drives the blower included in the air supply device 2 to compress the cleaned air so that the engine 1 Insufficient pressure and oxygen concentration of the cleaned air supplied to the The air supply device 2 will be described in detail below.

[Structure of Air Supply Device 2]
2 and 3 are sectional views showing the structure of the air supply device 2. FIG. 2 and 3 are views of the cylindrical air cleaner 21 and blower 22 cut along a plane passing through the rotation shaft of a fan (an electric fan 222 to be described later) of the blower 22. FIG. As shown in FIG. 2, the air supply device 2 has a structure in which an air cleaning device 21 (corresponding to air cleaning means) and a blowing device 22 (corresponding to blowing means) are integrated. Specifically, the blower device 22 is integrated with the housing 211 of the air cleaning device 21 .

The air cleaning device 21 is a device for removing foreign matter from the air taken in from the outside of the vehicle. The air cleaner 21 comprises a housing 211 , an air cleaner element 212 , an air cleaner inlet 213 , an air cleaner outlet 214 and a valve 215 . The air purifier 21 takes in air from outside the vehicle through an air purifier inlet 213, as shown in the lower side of FIG.

The housing 211 has a cylindrical shape with a central axis extending in the horizontal direction in FIG. An air cleaning element 212 is arranged along the inner surface of the housing 211 . Air cleaning element 212 is a filter for removing foreign matter from the air taken in from air cleaner inlet 213 . A valve 215 is located at the air freshener outlet 214 . Valve 215 is, for example, a butterfly valve. A spring (not shown) is attached to the valve in FIG. 2 to bias valve 215 to close. In the example of FIG. 2, the negative pressure of the engine 1 opens the valve 215 against the biasing direction of the spring.

The blower device 22 is a device that generates wind for sending the air from which foreign matter has been removed toward the compressor 3 . The air blower 22 sends air from which foreign substances have been removed by the air cleaning element 212 (hereinafter also referred to as post-cleaning air) to the compressor 3 by rotating the electric fan 222 . The blower 22 includes a motor 221 , an electric fan 222 and a blower outlet 223 .

FIG. 2 shows a state in which the electric fan 222 of the air blower 22 is not rotating. FIG. 3 shows a state in which the electric fan 222 of the air blower 22 is rotating. As indicated by the dashed line in FIG. 2, the air supply device 2 has a route A, which is the first route for transporting air that has not passed through the blower device 22 to the engine 1 via the air purifier outlet 214. . As shown in FIG. 2, the cleaned air is transported through path A while the electric fan 222 is not rotating. A path A is a path extending from inside the housing 211 to the compressor 3 through the air cleaner outlet 214, as indicated by a plurality of thick arrows in FIG. When the electric fan 222 is not rotating, the valve 215 is open due to the pressure of the air flowing from the air cleaner 21 to the compressor 3 .

As shown in FIG. 3, the cleaned air inside the housing 211 is taken into the blower device 22 as indicated by the thick arrow inside the housing 211 in FIG. 3 while the electric fan 222 is rotating. As indicated by the dashed line in FIG. 3 , the air supply device 2 has a second outlet for transporting the cleaned air that has passed through the blower 22 from the blower outlet 223 to the engine 1 while the electric fan 222 is rotating. It has path B, which is 2 paths.

In the example of FIG. 3, valve 215 is closed by a spring biasing valve 215 to close. By configuring the valve 215 in this way, it is possible to prevent the cleaned air transported from the path B from flowing backward into the path A and returning into the housing 211 .

As described above, since the air supply device 2 includes the blower device 22 , the air supply device 2 can supply air compressed by the electric fan 222 to the compressor 3 . Since the blower device 22 is integrated with the air cleaning device 21, compared to the case where the air cleaning device 21 and the blowing device 22 are separately installed inside the vehicle, it is easier to install the two devices inside the vehicle. Securing of space can be facilitated.

[Control of blower device 22 by control unit 14]
Next, the operation of the control section 14 shown in FIG. 1 will be described in detail. The control unit 14 rotates the electric fan 222 of the air blower 22 when the pressure of the cleaned air supplied to the engine 1 measured by the pressure sensor 10 is equal to or lower than the pressure target value. The pressure target value is set so as to satisfy the combustion efficiency required for the vehicle, for example, and is stored in the storage unit 13 .

The control unit 14 may determine the pressure target value based on the remaining amount of the battery that supplies power to the blower device 22 . For example, the control unit 14 sets a relatively high first pressure target value when the remaining amount of the battery mounted on the vehicle is equal to or higher than a predetermined value. By setting the first pressure target value to the pressure target value, the control unit 14 can maintain the pressure of the cleaned air in a relatively high state and improve the fuel efficiency of the engine 1 . The predetermined value is a value that does not run short of the electric power used for running the vehicle when the blower device 22 is operated by the electric power of the battery. On the other hand, the control unit 14 sets a second pressure target value lower than the first pressure target value when the remaining amount of the battery mounted on the vehicle is less than the predetermined value. By setting the second pressure target value as the pressure target value, the control unit 14 can prevent a shortage of electric power of the battery used for running the vehicle.

The control unit 14 may rotate the electric fan 222 of the air blower 22 when the oxygen concentration measured by the MAF sensor 9 is equal to or lower than the concentration target value. The concentration target value is set so as to satisfy the combustion efficiency required for the vehicle, and is stored in the storage unit 13 .

The control unit 14 may determine the concentration target value based on the remaining amount of the battery that supplies power to the blower device 22 . For example, when the remaining amount of the battery mounted on the vehicle is equal to or greater than a predetermined value, the control unit 14 sets the relatively high first concentration target value as the concentration target value. On the other hand, the control unit 14 sets a second concentration target value lower than the first concentration target value when the remaining amount of the battery mounted on the vehicle is less than the predetermined value. The predetermined value is a value that does not run short of the electric power used for running the vehicle when the blower device 22 is operated by the electric power of the battery. The predetermined value may be the same as or different from the predetermined value used by the controller 14 to determine the pressure target value. By setting the first concentration target value to the concentration target value when the remaining amount of the battery is sufficient, the control unit 14 maintains the oxygen concentration of the air after cleaning at a relatively high state, and the engine 1 can be operated. Fuel efficiency can be improved.

The control unit 14 determines whether the pressure of the cleaned air supplied to the engine 1 measured by the pressure sensor 10 is equal to or higher than the pressure target value and the oxygen concentration of the cleaned air supplied to the engine 1 is equal to or higher than the concentration target value. In some cases, the electric fan 222 of the blower 22 is not rotated. By operating the control unit 14 in this way, it is possible to suppress the decrease in the remaining amount of the battery.

FIG. 4 shows the relationship between the electric power supplied to the motor 221 of the air blower 22 and the pressure of the cleaned air supplied to the engine 1 . The vertical axis in FIG. 4 indicates the pressure of the cleaned air supplied to the engine 1, and the horizontal axis in FIG.

As shown in the graph of FIG. 4, the control unit 14 supplies power to the motor 221 of the blower device 22 compared to the state in which the motor 221 of the blower device 22 is stopped (supplied power is 0 watts in FIG. 4). In this state, the pressure of the cleaned air supplied to the engine 1 can be increased. The control unit 14 can increase the pressure of the cleaned air supplied to the engine 1 as the amount of electric power supplied to the motor 221 of the blower device 22 is increased.

The control unit 14 identifies the difference between the pressure of the cleaned air measured by the pressure sensor 10 and the target pressure value. The control unit 14 may determine the amount of electric power to be supplied to the motor 221 of the blower device 22 based on the specified difference. For example, the controller 14 increases the amount of power supplied to the motor 221 of the blower device 22 as the specified difference increases. In this manner, the control unit 14 can prevent the pressure of the cleaned air supplied to the engine 1 from decreasing.

[Procedure for Air Supply to Engine 1 by Air Supply System 100]
FIG. 5 is a flowchart showing a processing procedure for supplying air to the engine 1 by the air supply system 100. As shown in FIG. This processing procedure is started, for example, when the engine 1 is started. First, the control unit 14 acquires the rotation speed of the engine 1 measured by the rotation speed sensor 12 and the accelerator opening measured by the accelerator pedal opening sensor (S101).

The control unit 14 reduces nitrogen oxides in the exhaust gas and maximizes fuel efficiency based on the rotation speed of the engine 1 and the accelerator opening measured by the accelerator pedal opening sensor. 11 is read from the storage unit 13 (S102). The control unit 14 calculates engine torque based on the rotation speed of the engine 1 . The control unit 14 refers to the data table stored in the storage unit 13 to determine the EGR valve opening stored in association with the rotational speed of the engine 1, the calculated engine torque, and the read fuel injection amount. is read from the storage unit 13 (S103). The control unit 14 calculates the EGR valve opening using a formula showing the relationship between the rotation speed of the engine 1, the engine torque, the fuel injection amount of the fuel injection nozzle 11, the engine torque, and the EGR valve opening. can be calculated.

The control unit 14 adjusts the amount of part of the exhaust gas to be returned to the engine 1 by opening the EGR valve 8 at the read EGR valve opening (S104). The control unit 14 acquires the pressure of the cleaned air measured by the pressure sensor 10 and the oxygen concentration measured by the MAF sensor 9 (S105). The control unit 14 determines whether or not the pressure of the cleaned air measured by the pressure sensor 10 is equal to or higher than the pressure target value (S106). When the pressure of the cleaned air measured by the pressure sensor 10 is equal to or higher than the pressure target value (YES in S106), the control unit 14 determines whether the oxygen concentration measured by the MAF sensor 9 is equal to or higher than the concentration target value. Determine (S107). When the oxygen concentration measured by the MAF sensor 9 is equal to or higher than the concentration target value (YES in S107), the control unit 14 returns to the process of S101.

When the control unit 14 determines in S106 that the pressure of the cleaned air measured by the pressure sensor 10 is less than the pressure target value (NO in S106), the control unit 14 starts rotating the electric fan 222 (S108), Return to the process of S105. When the control unit 14 determines in S107 that the oxygen concentration measured by the MAF sensor 9 is less than the concentration target value (NO in S107), the process proceeds to S108.

[Effects of the air supply system 100 of the present embodiment]
According to this embodiment, the air blower 22 can supply air compressed by the electric fan 222 to the engine 1 . Since the blower device 22 is integrated with the air cleaning device 21, compared to the case where the air cleaning device 21 and the blowing device 22 are separately installed inside the vehicle, it is easier to install the two devices inside the vehicle. Securing of space can be facilitated. Since the control unit 14 uses the electric fan 222 to compress the air supplied to the engine 1, it is possible to prevent the combustion efficiency of the engine 1 from decreasing due to the process of returning part of the exhaust gas to the engine 1. can do.

In the above description, the air supply system 100 has the compressor 3 and the turbine 4, and the air emitted from the air supply device 2 is supplied to the engine 1 via the compressor 3. , the air supply system 100 may not have the compressor 3 and the turbine 4 . In this case, air from the air supply device 2 is directly supplied to the engine 1 .

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of the gist thereof. be. For example, all or part of the device can be functionally or physically distributed and integrated in arbitrary units. In addition, new embodiments resulting from arbitrary combinations of multiple embodiments are also included in the embodiments of the present invention. The effect of the new embodiment caused by the combination has the effect of the original embodiment.

1 Engine 2 Air Supply Device 3 Compressor 4 Turbine 5 Intake Air Cooler 6 Intake Manifold 7 Cooler 8 Valve 9 MAF Sensor 10 Pressure Sensor 11 Fuel Injection Nozzle 12 Revolution Sensor 13 Storage Unit 14 Control Unit 15 Valve 21 Air Cleaner 22 Air Blower 100 Air supply system 211 Housing 212 Air cleaning element 213 Air cleaner inlet 214 Air cleaner outlet 215 Valve 221 Motor 222 Electric fan 223 Blower outlet

Claims (8)

An air supply system for supplying air to an engine mounted on a vehicle,
air cleaning means for removing foreign matter from the air taken in from the outside of the vehicle;
an air blowing unit that is integrated with the housing of the air cleaning unit and sends out the cleaned air from which the foreign matter has been removed to the engine by rotating an electric fan;
a first route for transporting the cleaned air that has not passed through the blower to the engine while the electric fan is not rotating;
a second route for transporting the cleaned air that has passed through the air blowing means to the engine while the electric fan is rotating;
a valve for suppressing the flow of the cleaned air transported from the second path into the first path;
comprising
air supply system. Further comprising a supercharging means for compressing the air that has passed through the electric fan and supplying it to the engine,
2. The air supply system of claim 1 . a pressure sensor that measures the pressure of air supplied to the engine;
a control unit that rotates the electric fan of the air blowing means when the pressure is equal to or lower than the pressure target value;
further comprising
3. The air supply system according to claim 1 or 2 . The control unit determines the amount of electric power to be supplied to the air blowing means based on the difference between the pressure and the target pressure value.
4. An air supply system according to claim 3 . The control unit determines the pressure target value based on the remaining amount of a battery that supplies power to the air blowing means.
4. An air supply system according to claim 3 . an oxygen sensor for measuring the oxygen concentration of air supplied to the engine;
a control unit that rotates the electric fan of the air blowing means when the oxygen concentration is equal to or lower than the concentration target value;
further comprising
2. The air supply system of claim 1 . The control unit determines the concentration target value based on the remaining amount of a battery that supplies power to the air blowing means.
7. An air supply system according to claim 6 . An air supply device for supplying air to an engine mounted on a vehicle,
air cleaning means for removing foreign matter from the air taken in from the outside of the vehicle;
an air blowing unit that is integrated with the housing of the air cleaning unit and sends out the cleaned air from which the foreign matter has been removed to the engine by rotating an electric fan;
a first route for transporting the cleaned air that has not passed through the blower to the engine while the electric fan is not rotating;
a second route for transporting the cleaned air that has passed through the air blowing means to the engine while the electric fan is rotating;
a valve for suppressing the flow of the cleaned air transported from the second path into the first path;
comprising
air supply.

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