JPS63295851A - Clogging detecting device for internal combustion engine air cleaner - Google Patents

Abstract

PURPOSE:To prevent improper operation due to the pulsation of negative pressure before the marginal clogging of a filter element, and detect the changing and cleaning time of the element by providing a means for damping the pulsation of the negative pressure between an intake passage and the negative pressure chamber of a clogging detecting device. CONSTITUTION:When an internal combustion engine operates, intake negative pressure is transmitted to the valve chamber 21 of a clogging detecting device 1. When pulsation pressure in the valve chamber 21 is low, the spring 44 of a pulsation damping valve 4 presses a valve body 45 to the side wall of a casing 36. When the pulsation pressure increases, the valve body 45 is displaced simply right and left, and the pulsation pressure is dampened in a negative pressure chamber 31 nearly to a static pressure level. When the pressure reaches a value corresponding to the marginal clogging of a filtration element, a diaphragm 32 overcomes a spring 34 and shifts to a position near an intake pipe. Then, the contact point 35a of an operation switch 35 comes in contact with the contact point 35d of a connection fitting 35f at the side of a lamp, thereby turning a warning lamp ON.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clogging detection device for one arena of an internal combustion engine mainly installed in an automobile.

[Prior Art] Traditionally, air cleaners for the internal combustion chamber, which are mainly installed in automatic vehicles, filter the air containing floating hard dust, supply clean air to the internal combustion engine, and remove dust from the internal combustion engine. Prevents wear on each part. However, when the filter element of an air cleaner becomes clogged with 'fM dust,
Since the performance of the internal combustion engine will decrease, the filter element should be kept at a constant value.
! It is necessary to exchange or cleanse it.

In view of this need, there is a clogging detection device for an air cleaner of an internal combustion engine that automatically detects clogging of an air cleaner of an internal combustion engine (Japanese Utility Model Publication No. 59-36688, Japanese Utility Model Publication No. 6).
0-72969).

Problem 1 to be solved by the invention These air cleaner clogging detection devices for internal combustion engines:
As the air cleaner filtration becomes clogged,
The intake f1 pressure of the internal combustion engine is 1! The clogging of the filtration element of 1 Acryno was detected for every 11 yen that increased from the clogging limit value (operation setting 11 pressure (1r1)) by utilizing the fact that the pressure increases due to the suction action of 1 r.

However, the flow of air in the intake pipe of an internal combustion engine is not a steady flow but a pulsating pressure, and therefore the negative pressure in the intake pipe is pulsating. Therefore, there is a problem in that the clogging detection device operates in a region where the negative pressure is momentarily large due to the pulsation of the negative pressure. Therefore, it is necessary to replace the filtration element that can still be used, which is uneconomical. Additionally, in order to avoid the effects of pulsation, the diaphragm is made too large, the spring constant is made too large, or the volume inside the clogging detection device is increased to attenuate the pulsation. , the current situation is that it has become large and cannot be made smaller.

An object of the present invention is to provide a one-creep clogging detection device for an internal combustion engine that prevents malfunctions due to atmospheric pressure pulsations.

[Means for Solving the Problems 1] The air cleaner clogging detection device for an internal combustion engine of the present invention includes:
The filtration element of the air cleaner that supplies clean air to the internal combustion engine has a negative pressure chamber that communicates with the intake passage on the downstream side, and when the negative pressure within the negative pressure increases more than a predetermined negative pressure, the filtration element In the clogging detection device for detecting clogging, a structure is adopted in which means for attenuating negative pressure pulses E1 is provided between the intake passage and the negative pressure.

[Operations and Effects of the Invention] The clogging detection device for the acrylic cleaner of the internal combustion engine of the present invention has the following features:
The above configuration provides the following actions and effects.

Since a negative pressure pulsation damping means is provided between the negative positive chamber communicating with the intake passage on the downstream side of the air cleaner's filtration element and the intake passage, the limit value of clogging due to negative pressure pulsation is reached. It is possible to prevent malfunctions such as activating the air cleaner beforehand, and it is possible to accurately detect when to replace or clean the air cleaner's filtration element.

[Embodiment] An embodiment of the air cleaner clogging detection device for an internal combustion engine according to the present invention will be described with reference to the drawings.

1 and 2 show a clogging detection device for an automobile air cleaner (hereinafter abbreviated as the clogging detection device) to which a first embodiment of the clogging detection device for an air cleaner for an internal combustion engine of the present invention is applied.

The clogging detection device 1 includes a housing 2 and a housing 2.
A pulse 1h pressure damping valve is provided between the negative pressure servo 3 connected to the negative pressure servo 3 and the Ω pressure chamber 31 of the negative pressure servo 3 and the intake pipe 14, which is a first stage of damping of negative pressure pulsation (hereinafter referred to as pulsating pressure). 4 and battery 1
5J5 and a clogging warning lamp 16 which is a means for making the user aware of clogging of the filter element 13a of the air cleaner 13.

The housing 2 has a valve 21 formed therein, a negative pressure servo connection part 22 which is connected to the negative pressure servo 3 by a screw thread and serves as an intake path, and a part from the negative pressure servo connection part 22 to the intake pipe 14 side. The intake pipe connecting portion 23 is formed in the shape of the intake pipe 14 and is connected to the intake pipe 14 by screwing. The intake pipe connecting portion 23 includes the valve chamber 21 and the intake pipe 14 downstream of the air cleaner 13.
A nozzle 24 is formed to communicate with the. Further, a sealing member 25 made of an O-ring is installed between the negative pressure servo connection portion 22 of the housing 2 and the negative pressure regulator 3.

Negative pressure servo 3
4, a diaphragm 32 that is displaced I/leo in a direction approaching the intake pipe 14 when the 0 pressure in the 1-pressure chamber 31 increases from a predetermined negative pressure, and a casing 33 that houses the diaphragm 32. , a spring 34 that urges the diaphragm 32 in a direction away from the intake pipe 14 via a metal retainer 34a, and an actuation switch 35 that is turned on and off by the operation of the diaphragm 32.

The casing 33 includes a main body case 36 that is connected to the negative pressure ribbon connection part 22 of the housing 2, a cover 38 that is connected to the main body case 36 by caulking and has a popular chamber 37 inside, and the main body case 36. A holding part 44 that is fixed between the cover 38 and slidably holds the actuation rod 32a that connects the diaphragm 32 and the actuation switch 35.
Consists of 39.

The activation switch 35 has a contact 35a at one end and a power supply terminal 35b connected to the battery 15 at the other end. and the tip is the contact point 35d +1
! ! It consists of a lamp side connecting fitting 35r whose end is a lamp side terminal 35e connected to the clogging warning lamp 16.

The power supply side connection fitting 35c is connected to the diaphragm 32 via the actuation rod 32a. When the negative pressure in the negative pressure chamber 31 increases and exceeds a predetermined negative pressure, the diaphragm 32 overcomes the biasing force of the spring 34 and moves a predetermined distance in the direction toward the intake pipe 14 (rightward in FIG. 1). [1] The power supply side connection fitting 35c is operated via the lead 32a.
It is connected to the lamp side connection fitting 35f. The power supply side connection fitting 35c is separated from the lamp side connection fitting 35' because the die 1 shim 32 is in the position shown in FIG. Inside the main body case 36, there are a valve chamber 21 and a negative pressure chamber 3.
A hole 36a is formed which communicates with the hole 36a.

The pulsating pressure reducing valve 4 is provided between the valve chamber 21 of the housing 2 and the negative pressure chamber 31 of the negative pressure servo 3, and the valve chamber 21 of the housing 2 and the negative pressure chamber 31 of the negative pressure servo 3 communicate with each other. a valve body 45 that is biased by a spring 44 in a direction in which the valve chamber 21 and f of the housing 2 are connected;
It consists of a hole 41 that communicates with the 0-pressure chamber 31 of the 1-pressure servo 3.

The operation of the clogging detection device 1 of this embodiment will be explained based on the drawings.

When the internal combustion engine 11 operates, the intake negative pressure in the intake pipe 14 downstream of the filtration element 13a of the air cleaner 13 is
It is transmitted to the valve chamber 21 through the nozzle 24 of the housing 2 of the clogging detection device 1 . This negative pressure PO in the valve chamber 21 is
The graph shown in the figure shows the relationship between the negative pressure PO in the valve chamber and the time t (
For example, when the rotation speed of the internal combustion engine 11 is 3000 rpm+)
The pressure is pulsating like this. Therefore, when the pulsating pressure in the valve chamber 21 is small, the spring 4 of the pulsating pressure damping valve 4
The valve body 45 is pressed against the wall surface of the main body case 3G by the biasing force 4, but when the pulsating pressure increases, the valve body 45 is also displaced from side to side in FIG. 1 due to fluctuations in negative pressure.

The valve body 45 not only displaces left and right in response to fluctuations in the negative pressure PO, but also transmits the negative pressure to the hole 41 in the adjustment screw 46 with attenuated pulsation.

Therefore, the negative pressure P1 in the negative pressure chamber 31 almost disappears as the pulsating pressure of the negative pressure is attenuated, as shown in the graph of FIG. 4 showing the relationship between the negative pressure P1 in the negative pressure chamber and time t. Approximate to pressure. By the way, when the filter element 13a of the air cleaner 13 becomes clogged and the negative pressure inside the intake pipe 14 increases,
The negative pressure is transmitted into the negative pressure chamber 31 of the clogging detection device 1. Then, when the negative pressure P1 in the negative pressure chamber 31 reaches a value corresponding to the clogging limit of the filtering niremen l-13a, the atmospheric chamber 37 is popular, so the diaphragm 3
2 overcomes the biasing force of the spring 34 and moves in the direction closer to the intake pipe 14. This movement of the die 1 fum 32 causes the actuation switch 35 connected to the actuation rod 32a to
The contact 35a of the power supply side connection fitting 35c contacts the contact 356 of the lamp side connection fitting F135f. Therefore, the power supply side connection fitting 35c and the lamp side connection fitting 35f are electrically connected.
Since the first operation switch 35 is turned on, the clogging warning lamp 16 lights up, making the user aware that the filter element 13a of the air cleaner 13 is clogged.

Therefore, since the clogging detection device 1 attenuates the pulsating pressure with the pulsating pressure damping valve 4 to approximate static pressure, d! ! The air cleaner 13 can be operated accurately without malfunctioning due to the pulsating pressure before reaching the clogging limit value of the air filter element 13a.
It is possible to determine when it is time to replace or clean the filter element 13a, which eliminates the uneconomical problem of replacing the filter element 13a that can still be used.

FIG. 5 shows a second embodiment of the air cleaner clogging detection device for an internal combustion engine according to the present invention.

(The same functional parts as the first embodiment have the same number and dimensions as 4 and 4.) In this embodiment, the atmospheric chamber 37 of the negative pressure chamber 3 of the first embodiment is replaced with the second negative pressure chamber 37a. At the same time, the cool air duct 17 (
A nozzle 52 is formed which communicates with the
A housing 5 having a connecting portion 53 that is connected to the cool air duct 11 by screwing, and a vein provided in the housing 5! l] Pressure damping valve 6 is installed.

The pulsating pressure damping valve 6 is connected between the valve chamber 51 of the housing 5 and the second negative pressure chamber 3721 of the negative pressure servo 3 via an Ω pressure pipe 51a, and is connected to the valve chamber 51 of the housing 5 and the mouth pressure. A valve body 63 that is biased upwardly by a spring 62 in a direction that does not communicate with the second pressure chamber 37a of the servo 3; an adjustment screw 64 fastened within the valve chamber 51 of the housing 5; and a hole 65 that communicates the valve chamber 51 of the housing 5 with the second (1-pressure constriction 37a) of the 1-pressure ribo 3.

The operating switch 30 of this embodiment has a contact 30a at its tip and a power supply end r30b connected to the battery 15 at the other end.
The removed power supply side connection fitting 30c, the power supply side connection fitting 3
0c and a predetermined gap, the tip is 1) 3
+:, i 30 d and the other end is clogged warning lamp 16
The lamp side connecting fittings 3Of, J3 and the diaphragm l\32, which are connected to the lamp side E-j''-30e, are fixed to the retainer 34a, and the power side connecting fittings 30c and the lamp side connecting fittings 30F are connected to IfI'i. A bowl-shaped connecting fitting 30 (consisting of

As for the connecting fitting 300i, when the negative pressure of the C=3 pressure chamber 31 increases and becomes more than a predetermined negative force, the biasing force of the spring 34 increases by 1.
] Since the diaphragm 32 moves a predetermined distance in the direction closer to the intake pipe 14 (to the right in the figure), the diaphragm 32 moves to the right in the figure and connects to the power supply side).
Connect the fitting 30c and the lamp side connecting fitting 30. When the negative pressure in the negative pressure chamber 31 is higher than the predetermined f'l pressure, the diaphragm 32 of the connecting fitting 30g is connected to the electric side connecting fitting p: 130C and the lamp side connecting fitting 30' as shown in the figure by the biasing force of the spring 34. Inside the main body case 3G, there is a hole 36a that communicates between the valve ¥21 and the negative pressure chamber 31.
is formed.

Here, 48.66 is the valve body 45.63 and the adjustment screw 46.
In order to improve the sealing performance with 64, the valve body 45.63
The seal member attached to the is shown.

As in this embodiment, a housing 5 and a pulsating pressure damping valve 6 are added to the first embodiment to take out negative pressure from the upstream and downstream of the air cleaner 13, and the left and right sides of the daisephram 32 (
A differential pressure clogging detection device that transmits the negative pressure to the second negative pressure 31 and 37a) and detects the differential pressure; Since the pulsating pressure is smoothed and the diaphragm 32 is operated by the differential pressure, the first
Filtration of air cleaner 13 more accurate than the example 1~
It is possible to detect the clogging state of 13a.

6 to 8 show other examples of damping valve structures used in the clogging detection device of FIG. 1.

(The same functional parts as the first example are given the same numbers.) The pulsating pressure damping valve 7 of the example shown in FIGS. 6 and 8 has the structure of the valve body and the spring of the first example. Reed valve 71.72
．． 73 structure, and by reducing the longitudinal direction by nj, the bar is made smaller. Reed valves 71 and 72 (made of rubber cage elastic material with an umbrella shape, fixed part 7 at the tip (lower end in the figure)
1a and 72a are fixed to an adjustment screw 74 having a hole 74F1. 4. This adjustment screw 74 is installed in place of the adjustment screw 46 in FIG. 1. On the other hand, the reed valve 73 in FIG. 8 is made of an elastic body such as a plate spring, and one end 73
a is fixed to the main body case 36 by a member 75,
(l!!4η Near 3b is the free end.

When pressure is transmitted to the valves 21 and 21, the reed valve 7
1.72.73 is close to the intake pipe 14 ◇
Then, 11 loaves are transmitted from the valve 21 to the zero pressure chamber 31.

Figures 9 and 10 show a q12 embodiment of the clogging detection device 9.1 for the air cleaner between internal combustion stages of the present invention.
1゜ (For the same function as the first embodiment, the same number is attached -J-)
In this embodiment, a cylindrical housing 5a and a pulsating pressure damping valve 8 are built into the main body case 36 of the negative pressure servo 3 on the right side of the intake pipe 1δ connection portion 36b connected to the intake pipe 14. The housing 5a includes a case connecting portion 55 having a valve chamber 54 inside and connecting to the main body case 36;
A nozzle 57 is formed in a negative pressure chamber side portion 56 provided on the negative pressure chamber 31 side from 5 to communicate the valve chamber 54 and the negative pressure chamber 31.

The pulsating pressure damping valve 8 is connected to the valve chamber 54 of the housing 5a and the negative pressure→
A valve body 82 is biased (=l) by a spring 81 in a direction (rightward in the figure) that does not communicate with the negative pressure chamber 31 of the nozzle 3;
Adjustment screw 83 fastened in hole 36a of main body case 36
and a hole 84 formed in the adjustment screw 83.

Here, the operation switch 35', h source side connection fitting 3. '
At the tip 35Q of +C, attach the lamp side connection fitting 357'
9.The diaphragm 32 is moved! Flj
When the pin 32a moves, the contact 35h is pressure-connected to the spring force 'C contact 35.

By incorporating the pulsating pressure damping valve 8 in the negative pressure chamber 3 as in this embodiment, the volume of the negative pressure chamber 31 is small, and the [[force P2 of the valve chamber 54 is If the leakage of the pulse iJ+Pr damping valve 8 is the same as the external equation of the first embodiment when the pressure becomes larger than the pressure P1 of the pulse iJ+Pr, then the interval until Pl = P2 becomes as shown in Fig. 10. Made by IJJ switch 35 ON, O
As shown in the graph showing the relationship between the FF state and the static pressure, the external pulsating pressure reducing valve (dotted line) b as in the first embodiment is better than the built-in pulsating pressure damping valve (solid line) as in the present embodiment. ) The first no of a is early. Therefore, in this embodiment in which the pulsating pressure damping valve 8 is incorporated, the hysteresis is smaller and the responsiveness of clogging detection is improved.

FIG. 11 shows a third embodiment of the air cleaner clogging detection device for an internal combustion engine according to the present invention.

(Identical to the first and second embodiments - functional parts are given the same numbers) In the third embodiment, the valve body 91 of the pulse V'' pressure damping valve 9 and the wall surface of the adjustment screw 92 on the intake pipe 14 side In order to improve the sealing performance with the valve body 91, a concave housing 94 is inserted into the wall hole 93, which has an end face shape similar to the end face shape of the wall face on the side of the valve body 91. It is provided between the valve body 91 and the adjusting screw 92.

Here, 95 connects the valve body 91 with the valve chamber 21 of the housing 2.
iI]' indicates a spring biased in a direction that does not communicate with the servo pressure chamber 31 of the servo chamber 3; 96 is formed on the adjustment screw 92, and the spring 96 is formed on the adjustment screw 92 to prevent the valve chamber 21 of the housing 2 from communicating with the servo chamber 31 of the servo chamber 3; Indicates the size of the hole that communicates with.

FIG. 12t shows a fourth embodiment of a clogging detection device for one cleaner of an internal combustion engine according to the present invention.

(Same functional components as in the third embodiment have the same numbers.) In the fourth embodiment, the sealing performance between the valve body 97 of the pulsating pressure damping valve 9 and the wall surface of the adjustment screw 92 on the intake pipe 14 side is In order to be improved over the seventh embodiment, the valve body 97 is formed into a spherical shape, and the wall portion 27 with the hole 26 on the intake pipe 14 side of the housing 2 is formed in a curved shape corresponding to the shape of the valve body 97. . In this embodiment, the wall 27 of the housing 2 is eliminated and the adjusting screw 92 is installed.
The wall surface on the intake pipe 14 side may be formed into a curved shape corresponding to the shape of the valve body 91.

FIG. 13 shows a fifth embodiment of a clogging detection device for an internal combustion engine air cleaner according to the present invention.

(Same as the fourth embodiment - the same numbers are used for functional objects) In the fifth embodiment, the sealing performance between the valve body 98 of the pulsation damping valve 9 and the wall surface of the adjustment screw 92 on the intake pipe 14 side was In order to be improved over the embodiment, the valve body 98 is formed into a conical shape, and the wall surface of the adjustment screw 92 on the intake pipe 14 side is formed into a cone shape corresponding to the shape of the valve body 91.

As another embodiment, the wall portion 27 of the housing 2 may be discarded and the wall surface of the adjustment screw 92 on the intake pipe 14 side may be formed into a cone shape corresponding to the shape of the valve body 98.

In this example, the connection between the main body case of the negative pressure servo and the housing, and the connection between the main body case or housing of the negative pressure servo and the adjustment screw of the pulsating pressure damping valve are made by fastening, but the connections are made by caulking, press-fitting, integral molding, etc. This can be done in various ways.

In this embodiment, a pulsating pressure damping valve is used as the negative pressure pulsation damping means, but a throttle may be used as the negative pressure pulsation damping means.

In this embodiment, the activation switch is built into the negative pressure servo, but the activation rod of the negative pressure servo is protruded from the outside of the negative pressure servo, so that the activation switch is placed outside the negative pressure servo. You may do so. In this case, the 0-pressure ribo will be more compact than this embodiment.

In this embodiment, a clogging warning lamp is used as a means to make the user aware that the filter element of the Air Cleaner is clogged. A clogging warning buzzer or the like may also be used.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of the air cleaner clogging detection device for an internal combustion engine according to the present invention, and FIG. 2 shows a first embodiment of the air cleaner clogging detection device for an internal combustion Schematic diagram showing the intake system of the applied internal combustion engine, Part 3
The figure is a dimensional graph showing the relationship between the 0 pressure PO of the valve chamber and the time t of the first embodiment of the air cleaner clogging detection device of the internal combustion engine of the present invention. 1. (101-
] 11.1 A graph showing the relationship between t and t; FIG.
The cross-sectional views of the embodiments, FIGS. 6, 7, and 8, are the outline of the first practical example of the air cleaner clogging detection device for an internal combustion engine! FIG. 9 is a cross-sectional view showing other examples of the PIJ pressure reduction chastity valve, and FIG.
11 is a graph showing the relationship between the ON and OFF states of the operating switch and the static pressure of the second embodiment of the clogging detection device [1] of the air cleaner of the internal combustion engine of the present invention. FIG. 1] A sectional view showing the third embodiment of the clogging detection device, and FIG. 12 is a sectional view showing the pulse initial pressure damping valve of the fourth embodiment of the internal combustion (E-cleaner) clogging detection device of the present invention. , FIG. 13 is a sectional view showing a pulsating pressure reducing fj valve of a fifth embodiment of the 17 creep screening detection device for an internal combustion engine of the present invention. In the figure, 1...clogging detection device 2.5 .5a... Housing 3... Negative pressure servo 4.6.7.8.9... Pulsating pressure reducing valve (Q reducing means) 13... Air cleaner 13
a...Filtering element 14...Intake pipe 21...
・Valve chamber 31... Negative pressure chamber

Claims (1)

[Scope of Claims] A negative pressure chamber communicating with an intake passage on the downstream side of a filtration element of an air cleaner that supplies clean air to an internal combustion engine is provided, and the negative pressure in the negative pressure chamber is increased from a predetermined negative pressure. In the clogging detection device for detecting clogging of the filter element, an eye for an air cleaner for an internal combustion engine, characterized in that a negative pressure pulsation damping means is provided between the intake passage and the negative pressure chamber. Clogging detection device.