JPH08232771A - Exhaust gas recirculation device - Google Patents

Abstract

(57) [Abstract] [Object] An object of the present invention is to achieve simplification of structure, reduce exhaust pulsation, reduce temperature of recirculated exhaust gas, and reduce exhaust gas with a simple structure. It is intended to reduce the influence of pulsation and exhaust temperature so that the EGR amount can be controlled with high accuracy. To achieve this object, the present invention provides an EGR valve in the middle of an EGR passage that communicates an exhaust passage and an intake passage of an internal combustion engine, and an EGR valve upstream of the EGR valve.
A check valve and a storage chamber are provided in the GR passage, and the EGR amount is based on the detection values of the first pressure sensor provided in the storage chamber and the second pressure sensor provided in the intake passage near the portion where the EGR passage communicates. Control means for controlling the operation of the EGR valve to control the EGR valve, and the EGR valve for controlling the EGR amount based on the detection value of the flow rate sensor provided in the EGR passage downstream of the EGR valve. Is provided, and the storage chambers are arranged in multiple stages.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation system, and more particularly, it can simplify the structure, reduce exhaust pulsation and reduce the temperature of recirculated exhaust gas. With a simple structure, it is possible to reduce the influence of exhaust pulsation and perform highly accurate control of the EGR amount, and with a simple structure, reduce the effect of exhaust pulsation and lower the temperature of the recirculated exhaust gas. The present invention relates to an exhaust gas recirculation device capable of highly accurately controlling the EGR amount.

[0002]

2. Description of the Related Art Some internal combustion engines mounted on vehicles or the like are equipped with an exhaust gas recirculation device in order to reduce the amount of NOx in the exhaust gas. The exhaust gas recirculation device recirculates a part of the exhaust gas from the exhaust passage to the intake passage according to the operating state of the internal combustion engine (Exhaust Gas Recirculation).
n: EGR), which reduces the generation of NOx.

A conventional exhaust gas recirculation system has a system of controlling the exhaust gas to be recirculated by back pressure (Japanese Patent Publication No. 60-2).
No. 4303, Japanese Patent Publication No. 60-20573),
A system that controls the EGR rate of the exhaust gas (Japanese Patent Publication No. 60-2
No. 0573 and Japanese Patent Publication No. 60-10180).

Further, in the conventional exhaust gas recirculation device, the EGR branch passage communicating with each cylinder is communicated with a common storage chamber, and each E
There is one in which exhaust gas is directly ejected into the cylinder by an auxiliary intake valve provided in the GR branch passage (Japanese Patent Publication No. 60-20575).

[0005]

However, the back pressure control method described above (Japanese Patent Publication No. 60-24303 and Japanese Patent Publication No. 60-
The exhaust gas recirculation device of Japanese Patent No. 20573) has a disadvantage that it is difficult to control EGR with high accuracy due to the influence of exhaust pulsation. Further, the EGR rate control method (Japanese Patent Publication No. 60-20
The exhaust gas recirculation device in Japanese Patent No. 573 and Japanese Patent Publication No. 60-10180) does not detect the actual EGR amount of the exhaust gas to be recirculated, which makes it difficult to control with high accuracy. Moreover, the back pressure control method and the EGR rate control method have a disadvantage that the structure is complicated because a plurality of control valves are combined and controlled.

Further, the exhaust gas recirculation device provided with a storage chamber in the EGR passage (Japanese Patent Publication No. 60-20575) comprises:
Since the EGR branch passage communicating with each cylinder is provided and the exhaust gas is directly ejected into the cylinder by the auxiliary intake valve, it is difficult to set between the cylinders.
There is a disadvantage that the structure becomes complicated.

Further, as an exhaust gas recirculation device for controlling the EGR amount with high accuracy, there is a device for detecting the actual EGR amount by a flow rate sensor provided in the EGR passage and controlling the EGR valve. There is an inconvenience that the accuracy is affected and there is an inconvenience that the reliability of the flow rate sensor is deteriorated by the high temperature heat of the exhaust gas that is recirculated.

[0008]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides an EGR passage which connects an exhaust passage and an intake passage of an internal combustion engine, and the EGR passage is provided in the middle of the exhaust passage. An EGR valve for controlling the EGR amount of the exhaust gas recirculated to the intake passage is provided, and an exhaust check valve and an exhaust storage chamber are sequentially provided in the EGR passage upstream of the EGR valve from the exhaust passage side. And a second pressure sensor in the intake passage near the portion where the EGR passage communicates with the first pressure sensor in the storage chamber, and the intake air is detected based on the detection values of the first and second pressure sensors. A control means for operating and controlling the EGR valve is provided to control the EGR amount of the exhaust gas recirculated to the passage, and the EGR valve downstream of the EGR valve is characterized by being provided.
A flow rate sensor is provided in the passage, and control means for controlling the operation of the EGR valve is provided to control the EGR amount of the exhaust gas recirculated to the intake passage based on the detection value of the flow rate sensor.

[0009]

According to the structure of the present invention, the exhaust gas recirculation device is
By providing the exhaust check valve and the exhaust storage chamber in order from the exhaust passage side in the EGR passage upstream of the EGR valve, the hot exhaust gas is expanded with a simple structure to reduce the pressure fluctuation of the exhaust pulsation. The size of the exhaust gas can be reduced and the high temperature exhaust gas can be dissipated. Further, the exhaust gas recirculation device controls the EGR amount by the control means based on the detection values of the first pressure sensor provided in the storage chamber and the second pressure sensor provided in the intake passage near the portion where the EGR passage communicates. By controlling the operation of the EGR valve in order to stabilize the pressure difference between the upstream side and the downstream side of the EGR valve by the check valve and the storage chamber, the detection accuracy of the pressure value by the first and second pressure sensors is improved. be able to. In addition, the exhaust gas recirculation system
By controlling the operation of the EGR valve so as to control the EGR amount based on the detection value of the flow rate sensor provided in the EGR passage downstream of the EGR valve, the check valve and the storage chamber heat the exhaust gas to the flow rate sensor at high temperature. The effect of can be reduced.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of the present invention. 1 and 2, 2 is an internal combustion engine, 4
Is an intake pipe, 6 is an intake passage, 8 is a throttle valve, 10 is an exhaust pipe, and 12 is an exhaust passage. The internal combustion engine 2 is provided with an exhaust gas recirculation device 14. The exhaust gas recirculation device 14 connects the exhaust pipe 10 and the intake pipe 4 by an EGR pipe 16, and includes an EGR passage 18 that connects the exhaust passage 12 and the intake passage 6 to each other.

In the middle of the EGR passage 18, the exhaust passage 12
An EGR valve 20 for controlling the EGR amount of exhaust gas recirculated from the intake air passage 6 to the intake passage 6 is provided. The EGR valve 20 is an EGR valve.
A valve hole 22 is provided in the middle of the passage 18, a valve body 24 that is brought into contact with and separated from the valve hole 22 is provided, and a solenoid type drive unit 26 that drives the valve body 24 is provided.

An EGR passage 18 upstream of the EGR valve 20 is provided with an exhaust check valve 28 and an exhaust storage chamber 32 formed by a box body 30 in order from the exhaust passage 12 side. The check valve 28 is a reed valve type valve mechanism, is provided closer to the exhaust passage 12 than the storage chamber 32, and is opened by a pressure of a certain level or more. The storage chamber 3
2 is provided in a space larger than the EGR passage 18 between the check valve 28 and the EGR valve 20 to reduce the pressure fluctuation of exhaust pulsation.

An air flow sensor 34 for detecting the amount of air is provided in the intake passage 6. The throttle valve 8
Is a throttle sensor 36 for detecting the throttle opening.
Is provided. The internal combustion engine 2 is provided with a crank angle sensor 38 for detecting the angle of a crank shaft (not shown). The box body 30 is provided with a first pressure sensor 40 that detects the static pressure of the storage chamber 32. The EGR passage 18
A second pressure sensor 42 that detects the static pressure of the intake passage 6 is provided in the intake pipe 4 near the portion communicating with.

The EGR valve 20 and the air flow sensor 34
The throttle sensor 36, the crank angle sensor 38 and the first
The pressure sensor 40 and the second pressure sensor 42 are connected to a control unit 44 that is a control unit that constitutes the exhaust gas recirculation device 14.

The control unit 44 inputs detection signals from the respective sensors 34 to 42, and based on the detection values of the first and second pressure sensors 40 and 42, the EGR of the exhaust gas recirculated to the intake passage 6
The EGR valve 20 is operationally controlled to control the amount.

The control unit 44 of the first embodiment uses the static pressure detected by the first and second pressure sensors 40 and 42 as the intake air amount detected by the air flow sensor 34 and the throttle sensor 36.
The appropriate EGR amount of the target exhaust gas to be recirculated to the intake passage 6 is calculated (or the EGR amount is read from the memory) in combination with the throttle opening detected by the EGR amount of the recirculated exhaust gas. The EGR valve 20 is controlled to open at the opening timing set by the crank angle detected by the crank angle sensor 38 so that the calculated appropriate EGR amount is obtained.

As shown in FIG. 4, the EGR ratio, which is the ratio of the EGR amount of the exhaust gas recirculated to the intake passage 6 to the intake air amount, is small in the low load region and the high load region and is large in the medium load region. Is set according to the load. The load is determined by the throttle opening detected by the throttle sensor 36. The target EGR amount is
EGR rate and air flow sensor 3 set according to load
4 and the amount of intake air detected.

The target EGR amount is the EGR valve 20
Is obtained by controlling the operation so that is opened for the opening time ΔS. The opening time ΔS of the EGR valve 20 is a target EGR amount: Ge, a flow coefficient of the EGR valve 20: C ₁ ,
The correction coefficient of the control system of the control unit 44: C ₂ , the opening area of the valve hole 22 of the EGR valve 20: A, the specific gravity of the recirculated exhaust gas:
γ, static pressure of the storage chamber 32 detected by the first pressure sensor 40:
Pc and the static pressure of the intake passage 6 detected by the second pressure sensor 42: Pi, and is obtained by the equation shown in FIG.

Next, the operation of the first embodiment will be described.

The exhaust gas recirculation device 14 is provided with an EGR valve 20 in an EGR passage 18 which connects the exhaust passage 12 and the intake passage 6, and the EGR passage 18 upstream of the EGR valve 20.
Further, an exhaust check valve 28 and an exhaust storage chamber 32 are sequentially provided from the exhaust passage 12 side.

When the pressure in the exhaust passage 12 reaches a certain pressure or more, the check valve 28 is opened to flow into the EGR passage 18, and is expanded in the storage chamber 32 to reduce the pressure fluctuation of the exhaust pulsation and to radiate heat. After that, EGR valve 2
It is recirculated to the intake passage 6 by opening 0.

As a result, the exhaust gas recirculation device 14 is
Compared to the conventional exhaust gas recirculation system with multiple control valves,
With a simple structure in which the check valve 28 and the storage chamber 32 are provided, the pressure fluctuation of the exhaust pulsation can be reduced and the high temperature exhaust can be radiated. For this reason,
The exhaust gas recirculation device 14 can simplify the structure, reduce exhaust pulsation, and reduce the temperature of the exhaust gas to be recirculated.

Further, the exhaust gas recirculation device 14 includes the check valve 2
The control unit 44 controls the EGR amount of the exhaust gas whose exhaust pulsation has been reduced and whose temperature has been reduced by the storage chamber 32 and the storage chamber 32 as shown in FIG.

When the control is started, the control unit 44 takes in a throttle opening signal from the throttle sensor 36 (step 102) and determines the EGR rate set according to the load as shown in FIG. 4 (step 104). ).

Next, a signal of the intake air amount is taken from the air flow sensor 34 (step 106), and the target EGR amount Ge is determined from the EGR rate and the intake air amount (step 108).

The opening time ΔS of the EGR valve 20 is determined from the determined target EGR amount Ge (step 110). The opening time ΔS is the target EGR amount: G
e, the flow coefficient of the EGR valve 20: C ₁ , the correction coefficient of the control system of the control unit 38: C ₂ , the opening area of the EGR valve 20: A, the specific gravity of the recirculated exhaust gas: γ, the static pressure of the storage chamber 32 : Pc,
It is obtained from the static pressure in the intake passage 6, Pi, by the equation shown in FIG.

It is determined whether or not it is the opening timing of the EGR valve 20 set by the crank angle taken from the crank angle sensor 38 (step 112), and the set EGR is set.
If it is the opening timing of the valve 20 (step 112: YE
S), the operation is controlled so that the EGR valve 20 is opened for the opening time ΔS so that the EGR amount of the recirculated exhaust gas becomes the calculated proper EGR amount Ge (step 11).
4) Return.

As a result, the exhaust gas recirculation device 14 recirculates a part of the exhaust gas from the exhaust passage 12 to the intake passage 6 in accordance with the operating state of the internal combustion engine 2 to reduce the production of NOx.

In this way, the exhaust gas recirculation device 14 detects the first pressure sensor 40 provided in the storage chamber 32 and the second pressure sensor 42 provided in the intake passage 6 near the portion where the EGR passage 18 communicates. EG to control the EGR amount based on the value
The operation of the R valve 20 is controlled. Exhaust gas whose static pressure is detected by the first and second pressure sensors 40 and 42 has its exhaust pulsation reduced and its temperature lowered by the check valve 28 and the storage chamber 32.

As a result, the exhaust gas recirculation device 14 is
The exhaust valve pulsation is reduced and the temperature is lowered by the check valve 28 and the storage chamber 32.
The pressure difference between the upstream side and the downstream side of the valve 20 can be stabilized, and the static pressure of the exhaust gas that has stabilized the pressure difference can be detected to detect the first and second pressure sensors 40 and 42. The accuracy can be increased.

Therefore, the exhaust gas recirculation device 14 can reduce the influence of exhaust pulsation with a simple structure.
The highly accurate control of the EGR amount by the second pressure sensors 40 and 42 can be implemented.

5 and 6 show a second embodiment of the present invention. In the second embodiment, the portions having the same functions as those of the first embodiment will be described with the same reference numerals. That is, in FIG. 5, 2 is an internal combustion engine, 4 is an intake pipe,
6 is an intake passage, 8 is a throttle valve, 10 is an exhaust pipe, 12
Is an exhaust passage, 14 is an exhaust gas recirculation device, 16 is an EGR pipe, 1
8 is an EGR passage, 20 is an EGR valve, 22 is a valve hole, 24 is a valve body, 26 is a drive unit, 28 is a check valve, 30 is a box body, 3
2 is a storage chamber, 34 is an air flow sensor, 36 is a throttle sensor, and 38 is a crank angle sensor.

The exhaust gas recirculation device 14 of the second embodiment is
In the EGR pipe 16 between the EGR valve 20 and the intake pipe 4,
A flow rate sensor 46 for detecting the EGR amount of the exhaust gas flowing through the R passage 18 is provided. The flow sensor 46 may be of any type such as a hot wire type or an orifice type.

The EGR valve 20 and the air flow sensor 34
The throttle sensor 36, the crank angle sensor 38, and the flow rate sensor 46 are connected to a control unit 44 that is a control unit that constitutes the exhaust gas recirculation device 14.

The control unit 44 controls the sensors 34 to 38, 46.
Based on the detection value of the flow rate sensor 46, the operation of the EGR valve 20 is controlled so as to control the EGR amount of the exhaust gas recirculated to the intake passage 6 in real time.

The control unit 44 of the second embodiment combines the intake air amount detected by the air flow sensor 34 and the throttle opening detected by the throttle sensor 36, and becomes the target exhaust gas recirculated to the intake passage 6. Is calculated (or the EGR amount is read from the memory), and the crank angle is adjusted so that the actual EGR amount of the recirculated exhaust gas detected by the flow rate sensor 46 becomes the calculated proper EGR amount. The operation control is performed so that the EGR valve 20 is opened at the opening timing set by the crank angle detected by the sensor 38.

As shown in FIG. 4, the EGR rate, which is the ratio of the EGR amount of the exhaust gas recirculated to the intake passage 6 to the intake air amount, is small in the low load region and the high load region and is large in the medium load region. Is set according to the load. The load is determined by the throttle opening detected by the throttle sensor 36. The target EGR amount is
EGR rate and air flow sensor 3 set according to load
4 and the amount of intake air detected. The target EGR amount is obtained by controlling the operation so that the EGR valve 20 is opened for the opening time ΔS.

Next, the operation of the second embodiment will be described.

The exhaust gas recirculation device 14 is provided with an EGR passage 18 upstream of the EGR valve 20 provided in the EGR passage 18 that connects the exhaust passage 12 and the intake passage 6 to each other. 28 and a storage chamber 32 are provided.

When the pressure in the exhaust passage 12 reaches a certain pressure or more, the check valve 28 is opened to flow into the EGR passage 18 and is expanded in the storage chamber 32 to reduce the pressure fluctuation of the exhaust pulsation and to radiate heat. After that, EGR valve 2
It is recirculated to the intake passage 6 by opening 0.

As a result, the exhaust gas recirculation device 14 is
With a simple structure in which the check valve 28 and the storage chamber 32 are provided, the pressure fluctuation of the exhaust pulsation can be reduced and the high temperature exhaust can be radiated. For this reason,
The exhaust gas recirculation device 14 can simplify the structure, reduce exhaust pulsation, and reduce the temperature of the exhaust gas to be recirculated.

Further, the exhaust gas recirculation device 14 includes the check valve 2
The control unit 44 controls the EGR amount of the exhaust gas whose exhaust pulsation has been reduced and whose temperature has been lowered by the storage chamber 32 and the storage chamber 32 as shown in FIG.

When the control is started, the control unit 44 takes in a signal of the throttle opening from the throttle sensor 36 (step 202) and determines the EGR rate set according to the load as shown in FIG. 4 (step 204). ).

Next, the signal of the intake air amount is taken in from the air flow sensor 34 (step 206), the target EGR amount Ge is determined from the EGR rate and the intake air amount (step 208), and the signal is obtained from the crank angle sensor 38. It is determined whether or not it is the opening timing of the EGR valve 20 which is set by the crank angle that is set (step 210).

In this judgment (step 210), when the opening timing of the EGR valve 20 is set (step 210: YES), the operation control is performed so as to open the EGR valve 20 (step 212), and the exhaust gas is exhausted. The integrated amount G of the EGR amount is cleared to "0" (step 214), and the integrated amount G of the EGR amount of the exhaust gas recirculated by the flow rate sensor 46.
Is calculated (step 216).

The calculated proper EGR amount Ge and the integrated amount G of the EGR amount are compared to determine whether Ge <G (step 218).

In this judgment (step 218), E
When the integrated amount G of the GR amount is equal to or less than the calculated appropriate EGR amount Ge (step 218: NO), the process (step 2
Return to 16).

In this judgment (step 218), E
When the integrated amount G of the GR amount exceeds the calculated appropriate EGR amount Ge (step 218: YES), the EGR valve 20
Is closed (step 220) and the process returns.

As a result, the exhaust gas recirculation device 14 is
Calculate the integrated amount G of R amount and set the target E for each step E
It is determined whether or not the GR amount Ge has been reached, and a part of the exhaust gas from the exhaust passage 12 is taken into consideration depending on the operating state of the internal combustion engine 2.
To reduce NOx production.

As described above, the exhaust gas recirculation device 14 is
Flow rate sensor 4 provided in EGR passage 18 downstream of R valve 20
6, the actual amount of EGR is detected to calculate the integrated amount G,
It is determined whether or not the integrated amount G has reached the target EGR amount Ge for each step, and the EGR valve 2 is used to control the EGR amount.
0 to control the operation. The exhaust gas whose EGR amount is detected by the flow rate sensor 46 has its exhaust pulsation reduced and its temperature lowered by the check valve 28 and the storage chamber 32.

As a result, the exhaust gas recirculation device 14 is
By reducing the exhaust pulsation and reducing the temperature by the check valve 28 and the storage chamber 32, the influence of the high temperature heat of the exhaust gas on the flow rate sensor 46 can be reduced.

For this reason, the exhaust gas recirculation device 14 can reduce the influence of exhaust pulsation with a simple structure, and the flow sensor 46 can control the EGR amount with high accuracy and at the same time, the flow sensor 46 can be controlled. The reliability can be improved.

The exhaust gas recirculation device 14 of each of the above embodiments
In the above, the EGR passage 18 is provided with the one-stage storage chamber 32, but it may be arranged in multiple stages. For example, as shown in FIG. 7, the exhaust gas recirculation device 14 has two EGR pipes 16.
It is also possible to dispose one box body 48/50 and provide the EGR passage 18 with two storage chambers 52/54 arranged in multiple stages.

As described above, the exhaust gas recirculation device 14 in which the storage chambers 52 and 54 are arranged in multiple stages has the multistage storage chambers 52 and 54.
As a result, the exhaust pulsation can be further reduced and the temperature can be further reduced as compared with the above-described respective embodiments, whereby the first and second pressure sensors 40 and 42 can be obtained.
This makes it possible to perform the control of the EGR amount with higher accuracy.

Further, in FIG. 7, a multi-stage storage chamber 52 is provided.
Although the case where 54 is implemented in the first embodiment has been illustrated, it is obvious that the multi-stage storage chambers 52 and 54 can also be implemented in the second embodiment. When the multi-stage storage chambers 52 and 54 are implemented in the second embodiment, the exhaust pulsation can be further reduced and the temperature can be further lowered, thereby further improving the reliability of the flow rate sensor 46. It can be done.

[0057]

As described above, according to the present invention, the exhaust gas recirculation device can expand the high temperature exhaust gas with a simple structure to reduce the pressure fluctuation of the exhaust pulsation and also radiate the high temperature exhaust gas. In addition, the check valve and the storage chamber can stabilize the pressure difference between the upstream side and the downstream side of the EGR valve to improve the detection accuracy of the pressure value by the first and second pressure sensors. The influence of the high temperature heat of the exhaust gas on the flow rate sensor can be reduced.

Therefore, the exhaust gas recirculation device can simplify the structure, reduce the exhaust pulsation, and reduce the temperature of the exhaust gas to be recirculated, whereby the exhaust gas can be exhausted with a simple structure. It is possible to reduce the effect of pulsation, and to perform highly accurate control of the EGR amount using a pressure sensor,
Moreover, the influence of exhaust pulsation can be reduced by a simple structure and the temperature of exhaust gas to be recirculated can be lowered, so that the EGR amount can be controlled with high accuracy by the flow sensor and the reliability of the flow sensor can be improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an exhaust gas recirculation device showing a first embodiment of the present invention.

FIG. 2 is a block diagram of an exhaust gas recirculation device.

FIG. 3 is a flow chart of EGR amount control of the exhaust gas recirculation device.

FIG. 4 is an explanatory diagram of an EGR rate with respect to a load.

FIG. 5 is a schematic configuration diagram of an exhaust gas recirculation device showing a second embodiment.

FIG. 6 is a flow chart of EGR amount control of the exhaust gas recirculation device.

FIG. 7 is a schematic configuration diagram of an exhaust gas recirculation device showing another embodiment.

[Explanation of symbols]

 2 Internal Combustion Engine 4 Intake Pipe 6 Intake Passage 8 Throttle Valve 10 Exhaust Pipe 12 Exhaust Passage 14 Exhaust Recirculation Device 16 EGR Pipe 18 EGR Passage 20 EGR Valve 28 Check Valve 32 Storage Chamber 34 Air Flow Sensor 36 Throttle Sensor 38 Crank Angle Sensor 40 1st pressure sensor 42 2nd pressure sensor 44 Control part 46 Flow rate sensor

Claims (3)

[Claims] 1. An EGR passage that connects an exhaust passage and an intake passage of an internal combustion engine is provided, and an EGR valve for controlling the EGR amount of exhaust gas recirculated from the exhaust passage to the intake passage is provided in the EGR passage. An exhaust check valve and an exhaust storage chamber are sequentially provided from the exhaust passage side in the EGR passage upstream of the EGR valve, and a first pressure sensor is provided in the storage chamber and the EGR passage is A second pressure sensor is provided in the intake passage near the communicating portion, and the EGR valve is arranged to control the EGR amount of the exhaust gas recirculated to the intake passage based on the detection values of the first and second pressure sensors. An exhaust gas recirculation device comprising a control means for controlling the operation. 2. An EGR passage that connects an exhaust passage and an intake passage of an internal combustion engine is provided, and an EGR valve that controls the EGR amount of exhaust gas recirculated from the exhaust passage to the intake passage is provided in the EGR passage. An exhaust check valve and an exhaust storage chamber are sequentially provided from the exhaust passage side in the EGR passage upstream of the EGR valve, and a flow rate sensor is provided in the EGR passage downstream of the EGR valve. An exhaust gas recirculation device comprising: control means for controlling the operation of the EGR valve so as to control the EGR amount of exhaust gas recirculated to the intake passage based on the detection value of the flow rate sensor. 3. The exhaust gas recirculation device according to claim 1, wherein the storage chambers are arranged in multiple stages in the EGR passage.