JP2019132258A - Pre air cleaner - Google Patents

Abstract

To provide a pre air cleaner having less variation in output value of a mass air flow sensor.SOLUTION: A pre air cleaner 100 for separating power dust 103 contained in suctioned air before being supplied to an air cleaner 102, which is installed on a suctioned air upstream side of a mass air flow sensor 101, comprises: a turning part 109 installed on the suctioned air upstream side of the air cleaner 102, and turning the suctioned air before being supplied to the air cleaner 102; and a rectification part 110 installed between the air cleaner 102 and the turning part 109.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a pre-air cleaner that previously centrifuges dust contained in intake air before being supplied to an air cleaner of a vehicle.

  For example, when controlling the fuel injection amount in an internal combustion engine of an automobile, it is necessary to detect the intake air amount using a mass air flow sensor installed on the intake downstream side of the air cleaner. Because the relationship with the amount varies from vehicle type to vehicle type (even if it is the same vehicle type, it may differ due to differences in the internal combustion engine and other components), so the relationship between the output value of the mass air flow sensor and the intake air amount is different for each vehicle type It is necessary to obtain experimentally beforehand.

  In automobiles sold to high dust areas, it is contained in the intake air before it is supplied to the air cleaner by turning the intake air before it is supplied to the air cleaner installed upstream of the mass air flow sensor. There is a case where a pre-air cleaner for previously centrifuging the dust that is present is mounted (see, for example, Patent Document 1).

JP 2007-154705 A

  However, since the pre-air cleaner is installed on the upstream side of the intake of the mass air flow sensor, when the pre-air cleaner is installed, the intake air supplied to the mass air flow sensor becomes a swirling flow, and the mass air flow sensor detects the intake air amount. The air intake flow may be disturbed. In this case, since the output value of the mass air flow sensor varies, the desired fuel injection amount control cannot be performed, and the fuel consumption may be deteriorated.

  In view of the above circumstances, an object of the present disclosure is to provide a pre-air cleaner with less variation in output values of the mass air flow sensor.

  The present disclosure provides a pre-air cleaner that separates dust contained in intake air before being supplied to an air cleaner installed on an intake upstream side of a mass air flow sensor, and is installed on the intake upstream side of the air cleaner and There is provided a pre-air cleaner comprising a swirling portion that swirls intake air before being supplied to an air cleaner, and a rectifying portion installed between the air cleaner and the swirling portion.

  It is desirable to further include a double pipe part having an inner pipe part and an outer pipe part concentrically installed between the air cleaner and the swivel part.

  In the double pipe part, it is desirable that the inside of the inner pipe part is communicated with the air cleaner and the gap is not communicated with the air cleaner.

  The rectifying unit is preferably installed inside the inner pipe unit.

  It is desirable to further include a discharge part installed between the air cleaner and the swivel part.

  According to the present disclosure, it is possible to provide a pre-air cleaner with less variation in the output value of the mass air flow sensor.

It is a schematic sectional drawing which shows the intake structure containing the pre air cleaner which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the pre-air cleaner 100 according to the embodiment of the present disclosure is supplied to the air cleaner 102 by turning the intake air before being supplied to the air cleaner 102 installed on the intake air upstream side of the mass air flow sensor 101. The dust 103 contained in the intake air before being collected is centrifuged in advance.

  The mass airflow sensor 101 is installed in the intake pipe 104 on the intake downstream side of the air cleaner 102, and is a sensor created by experimentally obtaining the relationship between the output value of the mass airflow sensor 101 and the intake amount in advance for each vehicle type. The intake air amount is detected based on the output characteristic map data. In an automobile, for example, a flap type, hot wire type, or Karman vortex type mass air flow sensor 101 is generally used. The sensor output characteristic map data is stored in, for example, an engine control unit. The intake air amount is detected by the engine control unit referring to sensor output characteristic map data based on, for example, an output value transmitted from the mass air flow sensor 101 to the engine control unit.

  The air cleaner 102 includes an air filter 105 that filters the intake air and removes dust 103 contained in the intake air, and an air cleaner case 106 in which the air filter 105 is incorporated. In an automobile, for example, a dry, wet, or viscous air filter 105 is generally used. The air cleaner case 106 has a larger cross-sectional area than the intake pipe 104 in order to reduce intake resistance.

  In the air cleaner 102, the intake air supplied to the inlet 107 of the air cleaner case 106 through the intake pipe 104 is filtered through the air filter 105 and supplied to the internal combustion engine (not shown) through the outlet 108 of the air cleaner case 106.

  The pre-air cleaner 100 is installed on the upstream side of the intake air of the air cleaner 102 and is installed between the air cleaner 102 and the swirling unit 109 so as to rotate the intake air before being supplied to the air cleaner 102 and to the air cleaner 102. And a rectifying unit 110 that rectifies the intake air before being supplied.

  The swivel unit 109 is configured by, for example, swirl vanes that are installed inside the intake pipe 104 on the intake upstream side of the air cleaner 102 and generate a swirl flow. The swirl vane is constituted by, for example, a cyclone fin fixed inside the intake pipe 104. The intake air that has passed through the swirl unit 109 is supplied to the intake downstream side in the form of a swirl flow that circulates along the inner periphery of the intake pipe 104 around the central axis of the intake pipe 104 and advances forward to the intake downstream side.

  The rectifying unit 110 is configured by, for example, a rectifying grid whose cross section is a lattice shape, or a rectifying honeycomb grid whose cross section is a honeycomb shape. The intake air that has turned into a swirl flow through the swirl unit 109 is rectified by passing through the rectification unit 110 and then supplied to the intake downstream side.

  Therefore, since the intake air supplied to the mass air flow sensor 101 has already been rectified, the flow of intake air when the mass air flow sensor 101 detects the intake air amount is not disturbed, and variations in output values of the mass air flow sensor 101 are suppressed. I can do it.

  In addition, since the intake air supplied to the mass air flow sensor 101 has already been rectified, the flow of intake air when the mass air flow sensor 101 detects the intake air amount is the same as when the pre-air cleaner 100 is not installed. The output value of the sensor 101 is also equivalent to the case where the pre-air cleaner 100 is not mounted.

  Therefore, since the vehicle equipped with the pre-air cleaner 100 and the vehicle not equipped with the pre-air cleaner 100 can be regarded as the same vehicle type, the relationship between the output value of the mass air flow sensor 101 and the intake air amount must be obtained separately. It is possible to eliminate the cost increase factor.

  In addition, the pre-air cleaner 100 is installed between the air cleaner 102 and the swivel unit 109, and the inner pipe unit 111 in which the dust 103 contained in the intake air before being supplied to the air cleaner 102 is installed concentrically. The double pipe part 114 is guided and separated into the gap 113 between the air cleaner 102 and the outer pipe part 112, and is installed between the air cleaner 102 and the swivel part 109 and contained in the intake air before being supplied to the air cleaner 102. And a discharge portion 115 for discharging the dust 103 that has been discharged to the outside of the outer tube portion 112.

  The inner tube portion 111 is installed coaxially with the outer tube portion 112, for example. The outer pipe portion 112 is constituted by, for example, an intake pipe 104 between the air cleaner 102 and the turning portion 109. The gap 113 opens at the end of the inner pipe 111 on the intake upstream side and communicates with the intake pipe 104. For example, the gap 113 is closed and sealed at the end of the inner pipe 111 on the intake downstream side.

  The double pipe portion 114 separates the dust 103 contained in the intake air into the outer circumference side of the swirl flow in descending order of mass when the intake air that has turned into the swirl flow through the swivel portion 109 passes through the double pipe portion 114. And is blown off into the gap 113 outside the inner tube portion 111.

  Therefore, the intake air supplied to the air cleaner 102 through the inner pipe portion 111 contains little dust 103 having a large mass, and the amount of the dust 103 contained in the intake air supplied to the air cleaner 102 through the inner pipe portion 111 is reduced. Therefore, the life of the air filter 105 can be extended and the replacement frequency of the air filter 105 can be reduced.

  In the double pipe portion 114, the inside of the inner pipe portion 111 is communicated with the air cleaner 102, and the gap 113 is not communicated with the air cleaner 102. That is, in the double pipe portion 114, the gap 113 is sealed and not communicated with the air cleaner 102, so that the dust 103 blown off in the gap 113 is not supplied to the air cleaner 102.

  Further, in the double pipe portion 114, the rectifying portion 110 is installed inside the inner pipe portion 111, and therefore, intake air supplied to the air cleaner 102 through the inner pipe portion 111, that is, the air cleaner 102 through the pre-air cleaner 100. All the intake air supplied to the mass air flow sensor 101 via the flow is rectified, and variation in the output value of the mass air flow sensor 101 can be reduced.

  Further, the change in the output value of the mass air flow sensor 101 before and after mounting the pre-air cleaner 100 is reduced, and the relationship between the output value of the mass air flow sensor 101 and the intake air amount is the same regardless of the presence or absence of the pre-air cleaner 100. Therefore, it is possible to suppress an increase in costs caused by obtaining these relationships for each vehicle type.

  On the other hand, if the pre-air cleaner 100 is not installed and the intake air flow is uneven due to the duct shape or the like installed on the upstream side of the mass air flow sensor 101, only the rectifying unit 110 may be installed.

  Further, the rectifying unit 110 may be installed at the end of the inner pipe portion 111 on the intake downstream side. By installing the rectifying unit 110 at the end of the inner pipe portion 111 on the intake downstream side, for example, assembling becomes easier as compared with the case where the rectifying unit 110 is installed at the central portion of the inner pipe portion 111. In addition, by installing the rectifying unit 110 at the end of the inner pipe part 111 on the intake downstream side, the swirl flow passing through the double pipe part 114 is less likely to be weakened, so that the dust separation performance in the pre-air cleaner 100 is reduced. It becomes difficult.

  The discharge part 115 is comprised by the one set of flap 117 installed in the opening part 116 formed in the outer tube | pipe part 112, for example. The pair of flaps 117 are normally closed when the tips 118 come into contact with each other, and the tips 118 are opened apart from each other when the intake pressure is higher than the external pressure. When the set of flaps 117 is opened, the dust 103 collected between the set of flaps 117 is discharged to the outside of the outer pipe portion 112 together with the intake air. The flap 117 is made of thin rubber, for example.

  Further, the discharge unit 115 is installed at the end portion 119 of the gap 113 with respect to the flow direction of the intake air, and is installed below the outer pipe unit 112 in the gravity direction (vertically below).

  Accordingly, the dust 103 blown off in the gap 113 rides on the swirl flow and is guided to the terminal end 119 of the gap 113 and then falls toward the discharge portion 115 by its own weight.

  Therefore, the dust 103 blown off in the gap 113 can be effectively discharged to the outside of the pre-air cleaner 100 through the discharge portion 115.

  As described above, according to the present disclosure, it is possible to provide the pre-air cleaner 100 in which the change in the output value of the mass air flow sensor 101 before and after mounting is small.

  Further, if there is variation in the shape of the swivel unit 109 due to manufacturing tolerances, etc., the strength of the swirl flow also varies, leading to variations in the output value of the mass airflow sensor 101. It becomes possible.

DESCRIPTION OF SYMBOLS 100 Pre air cleaner 101 Mass airflow sensor 102 Air cleaner 103 Dust 104 Intake pipe 105 Air filter 106 Air cleaner case 107 Inlet part 108 Outlet part 109 Turning part 110 Rectification part 111 Inner pipe part 112 Outer pipe part 113 Crevice 114 Double pipe part 115 Exhaust part 116 opening 117 flap 118 leading end 119 terminal end

Claims (5)

In the pre-air cleaner that separates the dust contained in the intake air before being supplied to the air cleaner installed upstream of the mass air flow sensor,
A revolving unit that is installed on the intake upstream side of the air cleaner and revolves the intake air before being supplied to the air cleaner;
A rectifying unit installed between the air cleaner and the swivel unit;
A pre-air cleaner characterized by comprising The pre-air cleaner according to claim 1, further comprising a double tube portion having an inner tube portion and an outer tube portion concentrically disposed between the air cleaner and the swivel portion. The pre-air cleaner according to claim 2, wherein in the double pipe portion, the inside of the inner pipe portion is communicated with the air cleaner, and the gap is not communicated with the air cleaner. The pre-air cleaner according to claim 3, wherein the rectifying unit is installed inside the inner pipe unit. The pre-air cleaner as described in any one of Claims 2 thru | or 4 further equipped with the discharge part installed between the said air cleaner and the said turning part.

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