Controllable EGR system and engine with dual-inlet integrated high and low pressure EGR valves

Abstract

The present invention relates to a controllable EGR system and engine with dual-inlet integrated high- and low-pressure EGR valves. The system includes an engine, a dual-channel EGR cooler, an EGR mixer, and a dual-channel EGR valve. The present invention uses a single EGR valve to simultaneously control both high- and low-pressure EGR in the engine, simplifying the engine's EGR system structure and meeting the engine's requirements for high and low-pressure EGR under different operating conditions. When the engine requires only high and low-pressure EGR, different EGR rates can be controlled by adjusting the valve plate. When the engine requires both high and low-pressure EGR, the high and low-pressure EGR ratios can be adjusted.

Description

Technical Field

[0001] The present invention relates to the technical field of engine exhaust gas recirculation and cooling systems, and in particular to a controllable EGR system with dual inlets integrated with high and low pressure EGR valves and an engine. Background Art

[0002] EGR, or exhaust gas recirculation, involves partially introducing the engine's exhaust into the cylinders to lower combustion temperatures, thereby reducing NOx emissions. EGR is categorized as either cold EGR (low-pressure EGR) or hot EGR (high-pressure EGR). Cold EGR uses a cooler to cool some of the exhaust before introducing it into the cylinders. Hot EGR allows the exhaust to enter the cylinders directly without passing through a cooler. Cold EGR's temperature is lower than hot EGR, enabling lower combustion temperatures and further reducing NOx emissions.

[0003] The patent (application number CN201711048608.1) discloses a high- and low-pressure EGR technology, which uses high- and low-pressure EGR valves to control the high- and low-pressure EGR air paths to achieve high- and low-pressure EGR switching. The high-pressure EGR and low-pressure EGR completely share the same air path in the EGR cooler assembly. As a result, it does not have the function of introducing high-pressure EGR and low-pressure EGR at the same time, and thus cannot meet the engine's demand for high EGR rate under all operating conditions. Summary of the Invention

[0004] To solve the above problems, the present invention provides a controllable EGR system and engine with dual inlets integrating high and low pressure EGR valves to meet the demand for adjustable EGR rate under different working conditions.

[0005] The technical solution adopted by the present invention is: a controllable EGR system with dual inlets and integrated high- and low-pressure EGR valves, characterized in that it includes an engine, a dual-channel EGR cooler, an EGR mixer, and a dual-channel EGR valve. The exhaust manifold of the engine is divided into two paths, one of which passes through the supercharger turbine and is connected to the exhaust after-treatment device; the other passes through the high-pressure channel of the dual-channel EGR valve and enters the high-pressure EGR channel in the dual-channel EGR cooler, and then passes through the EGR mixer and enters the engine's intake pipe, forming a high-pressure EGR gas path;

[0006] The front end of the exhaust after-treatment device enters the low-pressure EGR channel in the dual-channel EGR cooler through a pipeline through the low-pressure channel of the dual-channel EGR valve, and then enters the intake pipe of the engine after passing through the EGR mixer to form a low-pressure EGR air path.

[0007] Preferably, fresh air passes through an air filter, a supercharger compressor, an air cooler and an EGR mixer and enters the engine through an intake pipe.

[0008] Preferably, the dual-channel EGR valve includes a motor, a motor shaft and a valve body, and the valve body is provided with a high-pressure valve plate for controlling the high-pressure channel and a low-pressure valve plate for controlling the low-pressure channel. The transmission shaft of the motor is connected to the high-pressure valve plate shaft of the high-pressure valve plate and the low-pressure valve plate shaft of the low-pressure valve plate at the same time through the first transmission gear set and the second transmission gear set.

[0009] Furthermore, the first transmission gear set includes a first sector driving gear, a first high-pressure sector driven gear and a first low-pressure sector driven gear. The first sector driving gear is fixedly connected to the motor shaft, the first high-pressure sector driven gear is fixedly connected to the high-pressure valve disc shaft, and the first low-pressure sector driven gear is fixedly connected to the low-pressure valve disc shaft. The first high-pressure sector driven gear and the first low-pressure sector driven gear are respectively arranged on both sides of the first sector driving gear and mesh with each other for transmission.

[0010] Furthermore, the second transmission gear set includes a second sector driving gear, a second high-pressure sector driven gear and a second low-pressure sector driven gear, the second sector driving gear is fixedly connected to the motor shaft, the second high-pressure sector driven gear is fixedly connected to the high-pressure valve disc shaft, the second low-pressure sector driven gear is fixedly connected to the low-pressure valve disc shaft, the second high-pressure sector driven gear and the second low-pressure sector driven gear are respectively arranged on both sides of the second sector driving gear, the second high-pressure sector driven gear and the second sector driving gear are meshed and transmitted through an idler gear, and the second low-pressure sector driven gear and the second sector driving gear are meshed and transmitted through an idler gear.

[0011] Furthermore, when the motor rotates clockwise from the initial state within the range of 0 to 60 degrees, the high-pressure valve plate shaft rotates within the range of 0 to 90 degrees, and the high-pressure valve plate opening range is 0 to 100%; at this time, the low-pressure valve plate opening remains at 0;

[0012] When the motor continues to rotate clockwise and changes in the range of 60° to 120°, the opening range of the high-pressure valve is 100% to 40%; at the same time, the opening range of the low-pressure valve is 0% to 60%.

[0013] When the motor rotates counterclockwise in the initial state within the range of 0-60°, the low-pressure valve shaft rotates within the range of 0-90°, and the low-pressure valve opening range is 0-100%. At this time, the high-pressure valve opening remains at 0.

[0014] When the motor continues to rotate counterclockwise and changes in the range of 60° to 120°, the opening range of the low-pressure valve plate is 100% to 40%, and at the same time, the opening range of the high-pressure valve plate is 0% to 60%.

[0015] Preferably, the water outlet of the engine is connected to the water inlet of the dual-channel EGR cooler after passing through a coolant flow regulating valve, and the water inlet of the engine is connected to the water outlet of the dual-channel EGR cooler.

[0016] Preferably, the water outlet of the dual-channel EGR cooler passes through a radiator, a thermostat and a water pump in sequence and is connected to the water inlet of the dual-channel EGR cooler to form a cooling water circuit.

[0017] Furthermore, a fan is provided next to the radiator, and the fan is driven by an engine.

[0018] An engine is characterized by having a controllable EGR system with dual inlets integrating high and low pressure EGR valves as described above.

[0019] The beneficial effects achieved by the present invention are: the present invention uses a single EGR valve to simultaneously control the engine's high- and low-pressure EGR, simplifying the engine's EGR system structure and meeting the engine's requirements for high and low-pressure EGR under different operating conditions. When the engine requires only high and low-pressure EGR, different EGR rates can be controlled by adjusting the valve plate; when the engine requires both high and low-pressure EGR, the high and low-pressure EGR ratios can be adjusted. The present invention has the following advantages:

[0020] 1. The present invention adopts a dual-inlet EGR valve, which can control high-pressure and low-pressure EGR separately and adjust the ratio to meet different EGR rate target requirements under different working conditions;

[0021] 2. The EGR valve of the present invention can realize the functions of controlling high-pressure and low-pressure EGR respectively with two valves, thereby reducing engine costs and making the layout more convenient and concise;

[0022] 3. The invention simultaneously introduces high-pressure and low-pressure EGR systems to meet the EGR rate requirements under different engine operating conditions, increase the EGR rate, reduce NOx, reduce pumping losses, and optimize fuel economy;

[0023] 4. In the present invention, the outlet temperature of the EGR cooler is regulated by regulating the coolant flow of the EGR cooler, thereby meeting the different EGR rate requirements of different engine operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the system principle diagram of the present invention;

[0025] Figure 2 It is a structural diagram of a dual-channel EGR valve;

[0026] Figure 3 This is the state diagram of the first transmission gear set in the initial state;

[0027] Figure 4 This is the state diagram of the second transmission gear set in the initial state;

[0028] Figure 5 This is the state diagram of the first transmission gear set after the motor rotates 60° clockwise;

[0029] Figure 6 This is the state diagram of the second transmission gear set after the motor rotates 60° clockwise;

[0030] Figure 7 This is the state diagram of the first transmission gear set after the motor rotates 120° clockwise;

[0031] Figure 8 This is the state diagram of the second transmission gear set after the motor rotates 120° clockwise;

[0032] Figure: 1. Air filter; 2. Supercharger compressor; 3. Exhaust aftertreatment device; 4. Supercharger turbine; 5. Intake pipe; 6. Exhaust manifold; 7. Air cooler; 8. Radiator; 9. Fan; 10. Thermostat; 11. Water pump; 12. Dual-channel EGR cooler; 13. Coolant flow control valve; 14. EGR mixer; 15. Dual-channel EGR valve; 16. Check valve; 17. Check valve.

[0033] 01. Motor; 02. Motor shaft; 03. Valve body; 04. First transmission gear set; 041. First sector driving gear; 042. First high-pressure sector driven gear; 043. First low-pressure sector driven gear; 05. Second transmission gear set; 051. Second sector driving gear; 052. Second high-pressure sector driven gear; 053. Second low-pressure sector driven gear; 053. Idle gear; 06. High-pressure valve disc; 07. High-pressure valve disc shaft; 08. Low-pressure valve disc; 09. Low-pressure valve disc shaft. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] like Figure 1-2 As shown, a controllable EGR system with dual inlets and integrated high- and low-pressure EGR valves of the present invention includes an engine, a dual-channel EGR cooler 12, an EGR mixer 14, and a dual-channel EGR valve 15. The exhaust manifold 6 of the engine is divided into two paths. One path passes through the supercharger turbine 4 and is connected to the exhaust after-treatment device 3; the other path passes through the high-pressure channel of the dual-channel EGR valve 15 and enters the high-pressure EGR channel in the dual-channel EGR cooler 12, and then passes through the EGR mixer 14 and enters the engine's intake pipe 5, forming a high-pressure EGR gas path.

[0038] The front end of the exhaust gas after-treatment device 3 enters the low-pressure EGR channel in the dual-channel EGR cooler 12 through a pipeline via the low-pressure channel of the dual-channel EGR valve 5, and then enters the engine's intake pipe 5 after passing through the EGR mixer 14, forming a low-pressure EGR air path.

[0039] In this embodiment, fresh air passes through the air filter 1, the supercharger compressor 2, the air cooler 7 and the EGR mixer 14, and enters the engine through the intake pipe 5.

[0040] Example 1: A controllable EGR system with dual inlets and integrated high- and low-pressure EGR valves includes an engine, a dual-channel EGR cooler 12, an EGR mixer 14, and a dual-channel EGR valve 15. The engine's exhaust manifold 6 is divided into two paths. One path passes through the supercharger turbine 4 and is connected to the exhaust after-treatment device 3; the other path passes through the high-pressure channel of the dual-channel EGR valve 15 and enters the high-pressure EGR channel in the dual-channel EGR cooler 12. Then, it passes through the EGR mixer 14 and enters the engine's intake pipe 5, forming a high-pressure EGR gas path.

[0041] The front end of the exhaust gas after-treatment device 3 enters the low-pressure EGR channel in the dual-channel EGR cooler 12 through a pipeline via the low-pressure channel of the dual-channel EGR valve 5, and then enters the engine's intake pipe 5 after passing through the EGR mixer 14, forming a low-pressure EGR air path.

[0042] In this embodiment, fresh air passes through the air filter 1, the supercharger compressor 2, the air cooler 7 and the EGR mixer 14, and enters the engine through the intake pipe 5.

[0043] Combine Figure 2-4 As shown, the dual-channel EGR valve 5 includes a motor 01, a motor shaft 02 and a valve body 03. A high-pressure valve plate 06 for controlling the high-pressure channel and a low-pressure valve plate 08 for controlling the low-pressure channel are provided in the valve body 03. The transmission shaft 02 of the motor 01 is connected to the high-pressure valve plate shaft 07 of the high-pressure valve plate 06 and the low-pressure valve plate shaft 09 of the low-pressure valve plate 08 through the first transmission gear group 04 and the second transmission gear group 05.

[0044] In this embodiment, the first transmission gear group 04 includes a first sector driving gear 041, a first high-pressure sector driven gear 042 and a first low-pressure sector driven gear 043. The first sector driving gear 041 is fixedly connected to the motor shaft 02, the first high-pressure sector driven gear 042 is fixedly connected to the high-pressure valve disc shaft 07, and the first low-pressure sector driven gear 043 is fixedly connected to the low-pressure valve disc shaft 09. The first high-pressure sector driven gear 042 and the first low-pressure sector driven gear 043 are respectively arranged on both sides of the first sector driving gear 041 and mesh with each other for transmission.

[0045] In this embodiment, the second transmission gear set 05 includes a second sector driving gear 051, a second high-pressure sector driven gear 052 and a second low-pressure sector driven gear 053. The second sector driving gear 051 is fixedly connected to the motor shaft 02, the second high-pressure sector driven gear 052 is fixedly connected to the high-pressure valve disc shaft 07, and the second low-pressure sector driven gear 053 is fixedly connected to the low-pressure valve disc shaft 09. The second high-pressure sector driven gear 052 and the second low-pressure sector driven gear 053 are respectively arranged on both sides of the second sector driving gear 051. The second high-pressure sector driven gear 052 and the second sector driving gear 051 are meshed and transmitted through the idler gear 054, and the second low-pressure sector driven gear 053 and the second sector driving gear 051 are meshed and transmitted through the idler gear 054.

[0046] Combine Figure 5-6 As shown, in this embodiment, when the motor 01 rotates clockwise from the initial state within the range of 0 to 60 degrees, the high-pressure valve plate shaft 07 rotates within the range of 0 to 90 degrees, and the opening range of the high-pressure valve plate 06 is 0 to 100%; at this time, the opening of the low-pressure valve plate 08 remains at 0;

[0047] Combine Figure 7-8 As shown, when the motor 01 continues to rotate clockwise and changes in the range of 60° to 120°, the opening range of the high-pressure valve plate 06 is 100% to 40%; at the same time, the opening range of the low-pressure valve plate 08 is 0% to 60%;

[0048] When the motor 01 rotates counterclockwise in the initial state within the range of 0-60°, the low-pressure valve plate shaft 09 rotates within the range of 0-90°, and the opening range of the low-pressure valve plate 08 is 0-100%. At this time, the opening of the high-pressure valve plate 06 remains at 0;

[0049] When the motor 01 continues to rotate counterclockwise and changes in the range of 60° to 120°, the opening range of the low-pressure valve plate 08 is 100% to 40%, and at the same time, the opening range of the high-pressure valve plate 06 is 0% to 60%.

[0050] The dual-channel EGR valve 15 of the present invention has the following functions:

[0051] 1. High-pressure and low-pressure EGR can be fully opened or closed respectively;

[0052] 2. The high-pressure EGR opening is 0, and the low-pressure EGR can achieve 0-100% control;

[0053] 3. The low-pressure EGR opening is 0, and the high-pressure EGR achieves 0-100% control;

[0054] 4. High-pressure EGR opening can be controlled from 100% to 40%, and low-pressure EGR can be controlled from 0% to 60%.

[0055] 5. Low-pressure EGR opening can be controlled from 100% to 40%, and high-pressure EGR can be controlled from 0% to 60%;

[0056] In the initial state, the opening of the low-pressure and high-pressure valves is 0.

[0057] Example 2: A controllable EGR system with dual inlets and integrated high- and low-pressure EGR valves includes an engine, a dual-channel EGR cooler 12, an EGR mixer 14, and a dual-channel EGR valve 15. The engine's exhaust manifold 6 is divided into two paths. One path passes through the supercharger turbine 4 and is connected to the exhaust after-treatment device 3; the other path passes through the high-pressure channel of the dual-channel EGR valve 15 and enters the high-pressure EGR channel in the dual-channel EGR cooler 12. Then, it passes through the EGR mixer 14 and enters the engine's intake pipe 5, forming a high-pressure EGR gas path.

[0058] The front end of the exhaust gas after-treatment device 3 enters the low-pressure EGR channel in the dual-channel EGR cooler 12 through a pipeline via the low-pressure channel of the dual-channel EGR valve 5, and then enters the engine's intake pipe 5 after passing through the EGR mixer 14, forming a low-pressure EGR air path.

[0059] In this embodiment, fresh air passes through the air filter 1, the supercharger compressor 2, the air cooler 7 and the EGR mixer 14, and enters the engine through the intake pipe 5.

[0060] Combine Figure 2-4 As shown, the dual-channel EGR valve 5 includes a motor 01, a motor shaft 02 and a valve body 03. A high-pressure valve plate 06 for controlling the high-pressure channel and a low-pressure valve plate 08 for controlling the low-pressure channel are provided in the valve body 03. The transmission shaft 02 of the motor 01 is connected to the high-pressure valve plate shaft 07 of the high-pressure valve plate 06 and the low-pressure valve plate shaft 09 of the low-pressure valve plate 08 through the first transmission gear group 04 and the second transmission gear group 05.

[0061] In this embodiment, the first transmission gear group 04 includes a first sector driving gear 041, a first high-pressure sector driven gear 042 and a first low-pressure sector driven gear 043. The first sector driving gear 041 is fixedly connected to the motor shaft 02, the first high-pressure sector driven gear 042 is fixedly connected to the high-pressure valve disc shaft 07, and the first low-pressure sector driven gear 043 is fixedly connected to the low-pressure valve disc shaft 09. The first high-pressure sector driven gear 042 and the first low-pressure sector driven gear 043 are respectively arranged on both sides of the first sector driving gear 041 and mesh with each other for transmission.

[0062] In this embodiment, the second transmission gear set 05 includes a second sector driving gear 051, a second high-pressure sector driven gear 052 and a second low-pressure sector driven gear 053. The second sector driving gear 051 is fixedly connected to the motor shaft 02, the second high-pressure sector driven gear 052 is fixedly connected to the high-pressure valve disc shaft 07, and the second low-pressure sector driven gear 053 is fixedly connected to the low-pressure valve disc shaft 09. The second high-pressure sector driven gear 052 and the second low-pressure sector driven gear 053 are respectively arranged on both sides of the second sector driving gear 051. The second high-pressure sector driven gear 052 and the second sector driving gear 051 are meshed and transmitted through the idler gear 054, and the second low-pressure sector driven gear 053 and the second sector driving gear 051 are meshed and transmitted through the idler gear 054.

[0063] Combine Figure 5-6 As shown, in this embodiment, when the motor 01 rotates clockwise from the initial state within the range of 0 to 60 degrees, the high-pressure valve plate shaft 07 rotates within the range of 0 to 90 degrees, and the opening range of the high-pressure valve plate 06 is 0 to 100%; at this time, the opening of the low-pressure valve plate 08 remains at 0;

[0064] Combine Figure 7-8 As shown, when the motor 01 continues to rotate clockwise and changes in the range of 60° to 120°, the opening range of the high-pressure valve plate 06 is 100% to 40%; at the same time, the opening range of the low-pressure valve plate 08 is 0% to 60%;

[0065] When the motor 01 rotates counterclockwise in the initial state within the range of 0-60°, the low-pressure valve plate shaft 09 rotates within the range of 0-90°, and the opening range of the low-pressure valve plate 08 is 0-100%. At this time, the opening of the high-pressure valve plate 06 remains at 0;

[0066] When the motor 01 continues to rotate counterclockwise and changes in the range of 60° to 120°, the opening range of the low-pressure valve plate 08 is 100% to 40%, and at the same time, the opening range of the high-pressure valve plate 06 is 0% to 60%.

[0067] In this embodiment, the water outlet of the engine is connected to the water inlet of the dual-channel EGR cooler 12 after passing through the coolant flow regulating valve 13 , and the water inlet of the engine is connected to the water outlet of the dual-channel EGR cooler 12 .

[0068] In this embodiment, the water outlet of the dual-channel EGR cooler 12 passes through the radiator 8, the thermostat 10 and the water pump 11 in sequence and is connected to the water inlet of the dual-channel EGR cooler 12 to form a cooling water circuit.

[0069] In this embodiment, a fan 9 is provided next to the radiator 8 and the fan 9 is driven by the engine.

[0070] The present invention also provides an engine having the controllable EGR system with the dual-inlet integrated high-pressure and low-pressure EGR valves.

[0071] The above illustrates and describes the basic principles and main structural features of the present invention. The present invention is not limited to the above examples. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

[0072] It should be noted that the description of the above technical solutions is illustrative only. This specification may be embodied in various forms and should not be construed as limiting the technical solutions set forth herein. Rather, these descriptions are provided to ensure that the disclosure of the present invention is thorough and complete and to fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of the present invention are limited only by the scope of the claims.

[0073] The shapes, sizes, ratios, angles, and numbers disclosed for describing various aspects of the present specification and claims are merely examples, and therefore, the present specification and claims are not limited to the details shown. In the following description, when a detailed description of a related known function or configuration is determined to be unnecessary to obscure the key points of the present specification and claims, the detailed description will be omitted.

[0074] When “including,” “having,” and “comprising” are used in this specification, unless otherwise used, there may also be another part or other parts, and the terms used may generally be singular but may also represent plural forms.

[0075] It should be noted that although the terms "first," "second," "top," "bottom," "one side," "the other side," "one end," "the other end," etc. may appear and be used in this specification to describe various components, these components and parts should not be limited by these terms. These terms are only used to distinguish one component or part from another. For example, without departing from the scope of this specification, a first component can be referred to as a second component, and similarly, a second component can be referred to as a first component. In certain circumstances, the components at the top and bottom can also be interchanged or switched with each other; the components at one end and the other end can have the same or different properties.

[0076] When describing positional relationships, for example, when the position sequence is described as "on," "above," "below," and "next," unless words or terms such as "just" or "directly" are used, situations where they are not in contact or in contact can also be included. If a first element is mentioned as being "on" a second element, it does not mean that the first element must be above the second element in the figure. The upper and lower parts of the components will change depending on the angle and orientation of observation. Therefore, in the drawings or in actual constructions, if it is mentioned that the first element is "on" a second element, it can include situations where the first element is "below" the second element as well as situations where the first element is "above" the second element. When describing temporal relationships, unless "just" or "directly" is used, situations where steps are not continuous can be included when describing "after," "subsequently," "followed," and "before." The features of the various embodiments of the present invention can be combined or spliced ​​with each other in part or in whole, and can be implemented in various different configurations as can be fully understood by those skilled in the art. The embodiments of the present invention can be implemented independently of each other, or can be implemented together in a mutually dependent relationship.

[0077] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and is susceptible to numerous variations. Any simple modifications, equivalent variations, and modifications to the above embodiments based on the technical essence of the present invention shall be deemed to fall within the scope of protection of the present invention.

Claims

1. A controllable EGR system with dual inlets and integrated high and low pressure EGR valves, characterized by: The invention comprises an engine, a dual-channel EGR cooler (12), an EGR mixer (14) and a dual-channel EGR valve (15), wherein the exhaust manifold (6) of the engine is divided into two paths, one path passes through a supercharger turbine (4) and is connected to an exhaust after-treatment device (3); the other path passes through a high-pressure channel of the dual-channel EGR valve (15) and enters a high-pressure EGR channel in the dual-channel EGR cooler (12), and then passes through the EGR mixer (14) and enters an intake pipe (5) of the engine, thereby forming a high-pressure EGR gas path; The front end of the exhaust gas after-treatment device (3) enters the low-pressure EGR channel in the dual-channel EGR cooler (12) through a pipeline via the low-pressure channel of the dual-channel EGR valve (15), and then enters the engine intake pipe (5) after passing through the EGR mixer (14), forming a low-pressure EGR air path; The dual-channel EGR valve (15) comprises a motor (01), a motor shaft (02) and a valve body (03); a high-pressure valve plate (06) for controlling a high-pressure channel and a low-pressure valve plate (08) for controlling a low-pressure channel are provided in the valve body (03); the motor shaft (02) of the motor (01) is connected to the high-pressure valve plate shaft (07) of the high-pressure valve plate (06) and the low-pressure valve plate shaft (09) of the low-pressure valve plate (08) through a first transmission gear set (04) and a second transmission gear set (05); The first transmission gear set (04) includes a first sector-shaped driving gear (041), a first high-pressure sector-shaped driven gear (042) and a first low-pressure sector-shaped driven gear (043), wherein the first sector-shaped driving gear (041) is fixedly connected to the motor shaft (02), the first high-pressure sector-shaped driven gear (042) is fixedly connected to the high-pressure valve plate shaft (07), and the first low-pressure sector-shaped driven gear (043) is fixedly connected to the low-pressure valve plate shaft (09), and the first high-pressure sector-shaped driven gear (042) and the first low-pressure sector-shaped driven gear (043) are respectively arranged on both sides of the first sector-shaped driving gear (041) and mesh with each other for transmission; The second transmission gear set (05) includes a second sector driving gear (051), a second high-pressure sector driven gear (052) and a second low-pressure sector driven gear (053), wherein the second sector driving gear (051) is fixedly connected to the motor shaft (02), the second high-pressure sector driven gear (052) is fixedly connected to the high-pressure valve plate shaft (07), and the second low-pressure sector driven gear (053) is fixedly connected to the low-pressure valve plate shaft (09), the second high-pressure sector driven gear (052) and the second low-pressure sector driven gear (053) are respectively arranged on both sides of the second sector driving gear (051), the second high-pressure sector driven gear (052) and the second sector driving gear (051) are meshed and transmitted via an idler gear (054), and the second low-pressure sector driven gear (053) and the second sector driving gear (051) are meshed and transmitted via an idler gear (054); When the motor (01) rotates clockwise from the initial state within a range of 0 to 60 degrees, the high-pressure valve plate shaft (07) rotates within a range of 0 to 90 degrees, and the opening range of the high-pressure valve plate (06) is 0 to 100%; at this time, the opening of the low-pressure valve plate (08) remains at 0; When the motor (01) continues to rotate clockwise and changes in the range of 60° to 120°, the opening range of the high-pressure valve plate (06) is 100% to 40%; at the same time, the opening range of the low-pressure valve plate (08) is 0% to 60%. When the motor (01) rotates counterclockwise in the initial state within a range of 0-60°, the low-pressure valve plate shaft (09) rotates within a range of 0-90°, and the opening range of the low-pressure valve plate (08) is 0-100%. At this time, the opening of the high-pressure valve plate (06) remains at 0; When the motor (01) continues to rotate counterclockwise and changes within the range of 60° to 120°, the opening range of the low-pressure valve plate (08) is 100% to 40%, and at the same time, the opening range of the high-pressure valve plate (06) is 0% to 60%.

2. The controllable EGR system with dual inlets and integrated high and low pressure EGR valves according to claim 1, characterized in that: Fresh air passes through the air filter (1), the supercharger compressor (2), the air cooler (7) and the EGR mixer (14), and enters the engine through the intake pipe (5).

3. The controllable EGR system with dual inlets and integrated high and low pressure EGR valves according to claim 1, characterized in that: The water outlet of the engine is communicated with the water inlet of the dual-channel EGR cooler (12) after passing through the coolant flow regulating valve (13), and the water inlet of the engine is communicated with the water outlet of the dual-channel EGR cooler (12).

4. The controllable EGR system with dual inlets and integrated high and low pressure EGR valves according to claim 3, characterized in that: The water outlet of the dual-channel EGR cooler (12) passes through the radiator (8), the thermostat (10) and the water pump (11) in sequence and is then connected to the water inlet of the dual-channel EGR cooler (12), forming a cooling water circuit.

5. The controllable EGR system with dual inlets and integrated high and low pressure EGR valves according to claim 4, characterized in that: A fan (9) is provided next to the radiator (8), and the fan (9) is driven by an engine.

6. An engine, characterized in that: A controllable EGR system having a dual-inlet integrated high and low pressure EGR valve according to any one of claims 1 to 5.

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