JPS6350536B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to an exhaust gas purification device for an engine used in an automobile.

Harmful components in conventional exhaust gas, such as NOx,
Various exhaust gas purification devices that reduce HC, CO, etc. have been proposed and adopted.

One way to reduce the NOx is to recirculate the exhaust gas into the combustion chamber of the engine. According to this means, the generation of NOx is reduced when a rich mixture is supplied during acceleration or the like.
In order to prevent deterioration of drivability, it is necessary to stop the recirculation of exhaust gas.

The purpose of the present invention is to: When this exhaust gas recirculation is stopped,
Air is injected into the intake passage at a rate substantially equal to the flow rate of the recirculated exhaust gas, thereby preventing sudden changes in engine output and thereby preventing deterioration of drivability.

The present invention achieves the above object, and is provided with an intake passage that supplies air-fuel mixture to the combustion chamber of an engine, an air injection passage that supplies air to the intake passage, and an air injection passage that is arranged in the air injection passage to control the amount of air input. an air flow control valve, a throttle member disposed upstream of the air flow control valve, and air that controls the opening and closing of the air flow control valve using the negative pressure of a negative pressure chamber to which the negative pressure of the intake passage is supplied. A quantity control device, an exhaust gas passage that discharges exhaust gas from the combustion chamber of the engine, an exhaust gas recirculation passage that communicates the exhaust gas passage with the intake passage, and an exhaust gas recirculation passage that controls the amount of exhaust gas recirculation by being disposed in the exhaust gas recirculation passage. a recirculation flow control valve that controls opening and closing of the recirculation flow control valve using the negative pressure of a negative pressure chamber to which the negative pressure of the intake passage is supplied; a flow rate control device, comprising a first pressure chamber to which a pressure substantially proportional to the intake flow rate of the engine is supplied and a second pressure chamber to which a pressure between the air amount control valve and the throttle member is supplied; A regulating valve device that communicates each negative pressure chamber to the atmosphere and adjusts the negative pressure in the negative pressure chamber according to the pressure in both pressure chambers, and a negative pressure chamber to which the negative pressure of the intake passage is supplied and the same negative pressure chamber. Exhaust gas purification characterized by comprising a switching valve device that selectively connects the negative pressure chamber of the air amount control device or the negative pressure chamber of the recirculation amount control device to the atmosphere by the urging force of The main purpose is the equipment. A first embodiment of the present invention will be described below with reference to FIG. It has a carburetor 4 and an intake manifold 6 for supplying an air-fuel mixture to an engine mounted on an automobile, and also has an exhaust manifold (not shown) for discharging exhaust gas.

Reference numeral 10 denotes an intake passage formed by the carburetor 4 and the intake manifold 6, and includes a vent lily 12 and a throttle valve 14.

100 is a fluid control device provided in the intake manifold 6, in which a fluid passage 102 communicating with the intake passage 10 is formed, and an exhaust gas recirculation amount control device 104 and an air amount control device 106 are integrally provided. .

The fluid passage 102 branches into two, one forming an exhaust gas recirculation passage 108 that communicates with the exhaust gas passage, and the other forming an air input passage 11 that is open to the atmosphere.
form 0. 112 is the exhaust gas recirculation passage 1
08, the opening and closing of which is controlled by the reflux control device 104.
a negative pressure chamber 120 to which negative pressure is supplied via a spring 122 provided in the negative pressure chamber; Valve 1
12 is fixed to a diaphragm 126,
The diaphragm 126 is connected to the negative pressure chamber 120 and the opening 12.
The air opening chamber 130 is open to the atmosphere via the air vent chamber 8. 132 is a throttle member provided upstream of the recirculation amount control valve 114 in the exhaust gas recirculation passage 108, and 134 is a pressure detection hole formed between the recirculation amount control valve 114 and the restriction member 132.

Reference numeral 106 denotes an air amount control device that controls the opening and closing of the air amount control valve 28 disposed in the air input passage 110, and the air amount control device 106 controls the opening and closing of the air amount control valve 28 disposed in the air input passage 110. Negative pressure chamber 34 to which pressure is supplied;
a spring 36 provided in the negative pressure chamber 34;
and a diaphragm 38 to which the air amount control valve 28 is fixed and which operates in response to the negative pressure of The atmosphere opening chamber 42 is limited.

Reference numeral 138 denotes a throttle member interposed between the air filter 136 and the air amount control valve 28 in the air input passage 110.

Reference numeral 46 denotes a regulating valve device, which has a first pressure chamber 48, a first atmosphere release chamber 50, a fifth pressure chamber 52, and a second atmosphere release chamber 54 from the right side in the figure. The chamber 50 is bounded by a first diaphragm 56 and includes a first atmosphere open chamber 50 and a second pressure chamber 5.
2 is partitioned by a partition wall 58 and further delimited by an auxiliary diaphragm 60, the second pressure chamber 52 and the second atmospheric release chamber 54 are delimited by a second diaphragm 62, and the 2 diaphragm 62 is secured to a substantially integral rod 64 and
4 is provided with a valve 66.

A first spring 68 is installed inside the first pressure chamber 48, and a pressure detection hole 13 is provided downstream of the throttle member 132 of the exhaust gas recirculation passage 108.
4 pressure is supplied via the communication path 142.
A second spring 72 is provided in the first atmosphere opening chamber 50.
is installed inside and is opened to the atmosphere through an opening 74. The second pressure chamber 52 includes a communication passage 7.
6 to the pressure detection hole 140 of the air injection passage 110. The second atmosphere opening chamber 54
is communicated with an opening 148 of a branch passage 150 branched from the communication passage 118 via a check valve 152, and the opening 148 is opened and closed by the valve 66, and an air filter 82 is connected to the atmosphere opening chamber 54. An opening 84 is provided. Alternatively, the air filter 82 may not be provided in the opening 84, and the communication passage 84 may be located at a substantially atmospheric pressure position in the intake passage 10, for example, at an upstream position 86 of the bench lily 12.
8.

Reference numeral 160 designates a switching valve device, which is connected to a negative pressure chamber 166 to which negative pressure is supplied via a communication passage 164 having an opening 162 slightly upstream of the fully closed position of the throttle valve 14 in the intake passage 10; It has a spring 168 provided therein, a diaphragm 170 actuated by the negative pressure of the negative pressure chamber 166, and a valve 174 actuated via a rod 172 fixed to the diaphragm 170. The valve 174 is connected to a branch passage 176 of the communication passage 118 that communicates with the negative pressure chamber 120 of the recirculation amount control device 104 and a communication passage 146 that communicates with the negative pressure chamber 34 of the air amount control device 106.
The branch passage 178 is switched so that only one side is opened to the atmosphere via an atmosphere opening passage 180 and an air filter 182, and the branch passage 176 is formed to communicate with the atmosphere opening passage 180 by a spring 184. . 186 is an orifice provided in the communication passage 164, 188 is an annular projection formed on the branch passage 176 side of the valve 174, and 190 is the branch passage 1 of the valve 174.
This is an annular projection formed on the 78 side.

With the above configuration, this embodiment operates as follows.
An orifice 1 is installed in the negative pressure chamber 166 of the switching valve device 160.
When the negative pressure supplied through the valve 86 is small, the diaphragm 170 is pressed downward in the drawing by the biasing force of the spring 168, and presses the valve 174 downward via the rod 172, causing the annular protrusion 188 of the valve 174 to Branch passage 176 is closed, and branch passage 178 is communicated with atmosphere opening passage 180.
When the negative pressure in the negative pressure chamber 166 is large, the diaphragm 170 is moved upward as shown in the figure against the urging force of the spring 168, and the rod 172 is moved upward, so that the valve 174 is Due to the force, an annular protrusion 190 is formed as shown in the figure.
closes the branch passage 178, and the branch passage 176 is communicated with the atmosphere opening passage 180. Therefore, according to the switching valve device 160, only one of the branch passages 176 and 178 is opened to the atmosphere due to the negative pressure in the negative pressure chamber 166, and the other is closed.
Since only one of the negative pressure chamber 120 of the recirculation flow control device 104 and the negative pressure chamber 34 of the air flow control device 106 is opened to the atmosphere and the other is supplied with negative pressure, the recirculation flow control valve 112 and the air flow control valve 28
only one of them opens the exhaust gas recirculation passage 108,
Alternatively, the air injection passage 110 is opened. For this reason,
The fluid passage 102 communicating with the intake passage 10 is controlled so that exhaust gas is supplied or air is injected.

Next, the operation of the regulating valve device 46 will be explained below. First, a case where air is introduced into the intake passage 10 will be described.

Here, the effective area of the first diaphragm 56 is
A ₁ , effective area of the auxiliary diaphragm 60 A ₂ , second
The effective area of the diaphragm 62 is _A3 , the biasing force of the first spring 68 at the illustrated position is substantially the same as the biasing force of the second spring 72 at the illustrated position, the exhaust gas pressure is Pe, the atmospheric pressure is Pa,
Let Pc be the pressure in the pressure detection hole 140 downstream of the throttle member 138 in the air injection passage 110. Further, the throttle valve 14 is opened to a predetermined opening degree, and the opening 1
It is assumed that the negative pressure generated at 44 and supplied to the negative pressure chamber 34 of the air amount control device 106 is sufficiently large to fully open the air amount control valve 28.

The biasing force acting on each diaphragm in the regulating valve device 46 is defined as (+) in the right direction and (-) in the left direction, the biasing force acting on the first diaphragm 56 is _F1 , and the biasing force acting on the auxiliary diaphragm 60 is If the force is F ₂ and the biasing force acting on the second diaphragm 62 is F ₃ , then F ₁ = -PeA ₁ +PaA ₁ F ₂ = -PaA ₂ +PcA ₂ F ₃ = -PcA ₃ +PaA ₃ Therefore, the above rod 64 And the force acting on the valve 66 is: =F ₁ +F ₂ +F ₃ = (Pa−Pe)A ₁ +(Pc −Pa)A ₂ +(Pa−Pc)A ₃ (1) where Pa is Since it is atmospheric pressure, Pa=0, and
If A ₂ is set small and can be ignored, then A ₂
=0, so =-PeA ₁ -PcA ₃ ......(2) Equation (2) above indicates the acting force that causes the valve 66 to open or close the opening to the atmosphere, and Pc>-A ₁ /A ₃ If Pe......(3), move the valve 66 in the direction of opening the opening 80 to the atmosphere, reduce the negative pressure in the negative pressure chamber 34 via the branch passage 178, and open the air amount control valve 28.
operates in the closing direction. Further, if Pc<-A ₁ /A ₃ Pe (4), the valve 66 is moved in the direction of closing the opening 80, and the pressure leaking from the branch passage 178 is reduced, so that the negative pressure chamber is closed. 34 negative pressure increases,
The air amount control valve 28 is operated in the opening direction.
Therefore, the pressure Pc in the pressure detection hole 140 is controlled so that Pc=-A ₁ /A ₃ Pe (5).

Here, since the pressure upstream of the throttle member 138 is Pa and the pressure downstream is Pc, the air flow rate Qa passing through the throttle member 138 is Qa∝√− (6), and the above ( 5) Since formula and Pa=0, The intake flow rate Qi passing through the intake passage 10 is approximately proportional to the exhaust gas flow rate Q _G , and the exhaust gas flow rate Q _G is Q _G ∝√−=√ ......(8) Therefore, the intake flow rate Qi and the air The flow rate Qa is Qa∝√∝Q _G (9), that is, the air flow rate is controlled in proportion to the intake flow rate, so the ratio of the air flow rate to the intake flow rate is controlled to be constant. Become.

That is, according to this embodiment, a change in the air flow rate due to the operation of the air flow control valve 28 provided in the air flow control device 106 that controls the air flow rate feeds back to the negative pressure that operates the air flow control device 106. will be done.

Subsequently, the switching valve device 160 opens the negative pressure chamber 34 of the air amount control device 106 to the atmosphere, and the negative pressure of the intake passage 10 is supplied only to the negative pressure chamber 120 of the recirculation amount control device 104. In this case, the air amount control valve 28 closes the air input passage 118 and the recirculation amount control valve 112 opens the exhaust gas recirculation passage 108. At this time, atmospheric pressure Pa is generated in the pressure detection hole 140 because the flow rate of air passing through the air injection passage 110 is 0, and pressure Pc' due to the passage of exhaust gas is generated in the pressure detection hole 134. It has occurred.

The biasing force acting on each diaphragm in the regulating valve device 46 is defined as (+) in the right direction and (-) in the left direction, the biasing force acting on the first diaphragm 56 is _F1 , and the biasing force acting on the auxiliary diaphragm 60 is If the force is F ₂ and the urging force acting on the second diaphragm 62 is F ₃ , then F ₁ = -Pc'A ₁ +PaA ₁ F ₂ = -PaA ₂ +PaA ₂ F ₃ = -PaA ₃ +PaA ₃ Therefore, the above rod The forces acting on the valve 64 and the valve 66 are: =F ₁ +F ₂ +F ₃ = -Pc′A ₁ +PaA ₁ (11) The above equation (11) indicates the effect of the valve 66 opening or closing the opening 148 to the atmosphere. If Pc'>Pa (12), the valve 66 moves in the direction of closing the opening 148, and the pressure leaking from the branch passage 150 is reduced, so that the negative pressure in the negative pressure chamber 120 is reduced. The pressure increases, operating the reflux control valve 112 in the opening direction.

If Pc'<Pa (13), the valve 66 moves in the direction of opening the opening 148, the amount leaked from the branch passage 150 increases, and the negative pressure in the negative pressure chamber 120 is reduced. The reflux control valve 112 is operated in the closing direction.

Therefore, the pressure Pc' in the pressure detection hole 134 is controlled so that Pc'=Pa (14). Here, the aperture member 1
32, the pressure upstream of the throttle member 132 is exhaust gas pressure Pe, and Pa
= 0, so Qg∝√−′=√−=√
………(15) Here, from the above equation (9), Qa∝√∝Q _G ………(9) Therefore, Qg∝√∝Qa ………(16) In other words, the above exhaust gas recirculation amount Qg is Intake amount Qa
Therefore, the ratio of the exhaust gas recirculation amount to the intake flow rate is controlled to be constant.

Further, the check valve device 152 provided in the communication path 150 and the communication path 118 is connected to the switching valve device 160.
When the valve 174 closes the branch passage 178 and opens the branch passage 176 to the atmosphere, that is, when the negative pressure chamber 120 of the recirculation amount control device 104 is opened to the atmosphere, the negative pressure of the air amount control device 106 Room 3
4 is supplied to the communication passage 146 and the communication passage 15.
The check valve device 154 prevents the negative pressure chamber 120 from being exposed to the atmosphere through the zero communication passage 118 and stopping the operation of the air amount control device 104. 106 negative pressure chamber 3
4 is opened to the atmosphere by the switching valve device 160, the negative pressure supplied to the negative pressure chamber 120 of the recirculation amount control device 104 is transmitted through each communication path, and the operation of the recirculation amount control device 106 is stopped. This is to prevent this from happening.

Therefore, according to this embodiment, the air injection passage 110
Since the fluid control device 100 is formed by partially serving as the exhaust gas recirculation passage 108 and by integrally forming the air amount control device 106 and the recirculation amount control device 104, it can be arranged compactly at a low cost. Further, according to this embodiment, the recirculation rate of exhaust gas can be controlled to be constant, and the air injection rate can be controlled to be constant, so by appropriately setting the throttle member, diaphragm, etc., the recirculation of exhaust gas can be controlled to be constant. There is almost no sudden change in output when switching between input and air input.
Effects such as reduced impact and improved driver stability are achieved.

Next, a modification of the regulating valve device 46 in the second embodiment of the present invention will be described with reference to FIG. The regulating valve device 200 in this modification includes a first pressure chamber 2
02, the second pressure chamber 204, and the air filter 20
6, and a small diaphragm 210 that limits the first pressure chamber 202 and the second pressure chamber 204, and a small diaphragm 210 that limits the second pressure chamber 204 and the atmosphere release chamber 208. A large diaphragm 212 is provided. The above atmosphere open room 208
A port 216 that communicates with the branch passage 214 of the communication passage 118 that supplies negative pressure to the negative pressure chamber 120 of the reflux amount control device 104, and a communication passage that supplies negative pressure to the negative pressure chamber 34 of the air amount control device 106. A port 220 communicating with the branch passage 218 of 146 is opened, and both the ports 216 and 220 are connected to the figure 8-shaped protrusion 2 of the valve 222 fixed to the large diaphragm 212.
24 are opened and closed separately and simultaneously. The small diaphragm 210 and the large diaphragm 212 are integrally connected via a rod 225. The pressure in the pressure detection hole 134 of the exhaust gas recirculation passage 108 is applied to the first pressure chamber 202 in the communication passage 202.
26 , and the pressure of the pressure detection hole 140 of the air injection passage 110 is transmitted to the second pressure chamber 204 via the communication passage 228 . 230 is a spring disposed in the first pressure chamber 202.
Note that the air opening chamber 208 is not particularly provided with an air filter 206, and a position 23 of the intake passage 10 upstream of the bench lily 12 at substantially atmospheric pressure is provided.
2 through a communication path 234.

The operation of the regulating valve device 200 will be explained. The exhaust gas pressure in the exhaust passage is Pe, the pressure in the pressure detection hole 134 located downstream of the throttle member 132 of the exhaust gas recirculation passage 108 is Pc, and the air input passage 1
The pressure of the pressure detection hole 140 arranged downstream of the No. 10 restricting member 132 is P'c, the atmospheric pressure is Pa, the effective area of the small diaphragm 210 is As, and the effective area of the large diaphragm 212 is A1. spring 2
The urging force of 30 is so small that it can be practically ignored,
Further, if the biasing force acting on each diaphragm is defined as (+) in the right direction and (-) in the left direction in the figure, Fs is the biasing force that acts on the small diaphragm 210, and F1 is the biasing force that acts on the large diaphragm 212. Fs=-PcAs+P'cAs (17) F1=-P'cA1+PaA1 (18) Therefore, the above rod 225 and valve 222
The force acting on is =Fs+F1=(P'c-Pc)As+(Pa-P'c)A1 (19) Here, the recirculation flow control valve of the recirculation flow control device 104 is controlled by the switching valve device 160. 112 closes the exhaust gas recirculation passage 108 and only the air quantity control valve 28 of the air quantity control device 106 is controlled to open or close, the exhaust gas recirculation passage 108
The pressure Pc of the pressure detection hole 134 is the exhaust gas pressure Pe
Also, assuming atmospheric pressure Pa = 0, = -P'c (A1 - As) - PeAs ...... (20) The above equation (20) means that the valve 222 opens the opening 220 to the atmosphere, or If P′c>−(A1/A1−As)Pe……(21), the valve 222 is moved in the direction of opening the opening 220 to the atmosphere, and the negative pressure chamber 34 is closed. The negative pressure is reduced and the air amount control valve 28 is operated in the closing direction.

Also, if P'c<-(As/A1-As)Pe......(22), the valve 222 is moved in the direction of closing the opening 220, and the pressure leaking from the branch passage 218 is reduced. The negative pressure in the negative pressure chamber 34 increases, operating the air amount control valve 28 in the opening direction.

Therefore, the pressure P'c of the pressure detection hole 140 is P′c=−(As/A1−As)Pe……(23) It is controlled so that

Next, the switching valve device 160 causes the air amount control valve 28 of the air amount control device 106 to close the air input passage 110, and the recirculation amount control valve 1
12 is controlled to open and close, the pressure P'c of the pressure detection hole 140 of the air injection passage 110 is equal to the atmospheric pressure Pa, and if Pa=0,
Equation (19) becomes =-PcAs (24). In the above equation (24), the valve 222 is the opening 21
6 to the atmosphere, or if Pc > 0 (25), the valve 222 is moved in the direction of closing the opening 216 to reduce the leaking pressure. The recirculation amount control valve 112 is operated in the opening direction.

If Pc<0 (26), the valve 222 is moved in the direction of opening the opening 216 to the atmosphere to reduce the negative pressure in the negative pressure chamber 120, and the reflux control valve 112 is operated in the closing direction. .

Therefore, the pressure Pc of the pressure detection hole 134 is Pc=0……(27) It is controlled so that

Therefore, the air amount Qa when only the air amount control device 106 is operating and air is injected is the pressure P′c downstream of the throttle member 138 as described above (23).
Since it is controlled as shown in the equation, as explained in equations (5) to (9) in the first embodiment, it is controlled in proportion to the intake flow rate Qi of the intake passage 10, and the rate of air flow rate is controlled to be constant. It will be done. In addition, the exhaust gas recirculation amount Qg when only the recirculation amount control device 104 is operating and the exhaust gas is being recirculated is expressed by the above formula (15).
As explained in (16), it is controlled in proportion to the intake air flow rate Qi of the intake passage 10, and the rate of the exhaust gas recirculation amount is controlled to be constant.

Here, in order to make the rate of the air flow rate Qa and the rate of the exhaust gas recirculation amount Qg constant, it is sufficient to make the air flow rate Qa and the exhaust gas recirculation amount Qg equal in the same operating state, so Qa=Qg ………(28) Here, in the general formula expressing the flow rate, only the pressure loss △P can be replaced as a variable, so Qa=K√△=K√−′ ………(29) Qg= It can be expressed as K√△=K√ ………(30). However, K is a constant From the above equations (28) to (30) -P'c=Pe......(31) From equations (23) and (31) -Pe=-As/A1-AsPe......(32 ) Therefore, As/A1-As=1......(33) ∴A1=2As......(34) From the above formula (34), the effective area A1 of the large diaphragm 212 is the effective area of the small diaphragm 210.
If it is twice As, the exhaust gas recirculation amount Qg and the air flow rate Qa can be set equal. In this case, the operation of the recirculation amount control device 104 and the air amount control device 106 can be switched by the switching valve device 160. Since the exhaust gas recirculation amount and the air flow rate supplied to the intake passage 10 when It is of excellent quality.

In addition, negative pressure slightly upstream of the fully closed position of the throttle valve 14 in the intake passage 10 was supplied to the negative pressure chambers of the recirculation amount control device and the air amount control device in each of the above embodiments through the communication passage. According to the negative pressure characteristics, when the throttle valve 14 is fully closed and fully open, the negative pressure becomes substantially atmospheric pressure, and the recirculation amount control device and the air amount control device do not operate, that is, the recirculation amount control valve also does not operate. The air flow control valve will also be closed, but the negative pressure characteristics are not particularly limited as long as sufficient negative pressure is supplied to both negative pressure chambers to operate both of the control valves. For example, the downstream negative pressure of the throttle valve 14,
Mixed negative pressure upstream and downstream of the throttle valve 14, lower edge of the throttle valve 14 (located upstream of the throttle valve 14 regardless of whether the throttle valve 14 is open or closed)
It is sufficient if a negative pressure, such as a nearby negative pressure, is supplied according to the area in which both of the control valves are operated.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing a first embodiment of the present invention, FIG. 2 is an explanatory diagram showing a modification of the first embodiment,
FIG. 3A is an explanatory view taken along arrow A in FIG. 2, and FIG. 3B is an explanatory view taken along arrow B in FIG. 2: Engine, 4: Carburetor, 6: Intake manifold, 8: Exhaust manifold, 10: Intake passage, 1
2: Bench lily, 14: Throttle valve, 110:
Air input passage, 106: Air amount control device, 28:
Air amount control valve, 34: Negative pressure chamber, 138:
Throttle member, 46: Regulating valve device, 48, 202: First pressure chamber, 52, 204: Second pressure chamber, 66, 2
22: Valve, 77, 140: Pressure detection hole, 8
6: opening, 100: fluid control device, 102: fluid passage, 104: reflux amount control device, 108: exhaust gas reflux passage, 112: reflux amount control valve, 1
20: Negative pressure chamber, 132: Throttle member, 134: Pressure detection hole, 152, 154: Check valve device, 160:
Switching valve device.

Claims (1)

[Claims] 1. An intake passage that supplies air-fuel mixture to the combustion chamber of the engine; an air injection passage that supplies air to the intake passage;
An air flow control valve disposed in the air input passage to control the air input amount, a throttle member disposed upstream of the air flow control valve, and a negative pressure chamber to which the negative pressure of the intake passage is supplied. an air volume control device that controls opening and closing of the air volume control valve using negative pressure;
An exhaust gas passage that discharges exhaust gas from the combustion chamber of the engine, an exhaust gas recirculation passage that communicates the exhaust gas passage with the intake passage, and a recirculation flow control installed in the exhaust gas recirculation passage to control the amount of exhaust gas recirculation. a recirculation flow control device that controls opening and closing of the recirculation flow control valve using the negative pressure of a negative pressure chamber to which the negative pressure of the intake passage is supplied; a first supplying a pressure substantially proportional to the intake flow rate of the engine;
It has a pressure chamber and a second pressure chamber to which the pressure between the air amount control valve and the throttle member is supplied, and depending on the pressure in both pressure chambers, communicates each of the negative pressure chambers with the atmosphere to create the same negative pressure. A regulating valve device that adjusts the negative pressure in the chamber,
Switching that selectively connects the negative pressure chamber of the air amount control device or the negative pressure chamber of the recirculation amount control device to the atmosphere using the negative pressure chamber to which the negative pressure of the intake passage is supplied and the urging force of the same negative pressure chamber. An exhaust gas purification device comprising a switching valve device having a valve.