EGR poppet valve and engine having the same

Abstract

The present invention provides an EGR poppet valve and an engine equipped therewith. The EGR poppet valve includes an actuator; a base body connected to the actuator; a valve shaft disposed within the base body; a first valve core and a second valve core disposed thereon; the first valve core and the second valve core are spaced apart; a first flow space is formed between the first valve core and the base body; a second flow space is formed between the second valve core and the base body; the first flow space is smaller than the second flow space; the valve shaft drives the first and second valve cores to move along the axial direction of the valve shaft to adjust the flow areas of the first and second flow spaces. The technical solution of the present invention satisfies both control accuracy requirements at relatively high EGR rates and control accuracy requirements at relatively low EGR rates.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to an EGR lift valve and an engine having the same. Background Art

[0002] As engines strive for ever-higher fuel consumption and thermal efficiency, the maximum EGR rate used is becoming increasingly higher. This also results in ever-larger EGR valve diameters. As the EGR valve diameter increases, the flow rate increases. While this increases the maximum achievable EGR rate of the engine—in other words, the maximum amount of EGR exhaust gas that can flow into the cylinder—this also presents a problem. This problem is that when the engine is operating, it not only uses the maximum EGR rate but also uses conditions with lower EGR rates. A high maximum achievable EGR rate means a larger EGR valve diameter and a larger EGR valve opening stroke, which facilitates the entry of a larger amount of EGR exhaust gas. This means that when achieving a low EGR rate, the EGR valve opening stroke is short, resulting in poorer control accuracy for the EGR valve than when achieving a high EGR rate. Summary of the Invention

[0003] The main purpose of the present invention is to provide an EGR lift valve and an engine having the same, so as to solve the problem that the EGR valve in the prior art cannot simultaneously meet the control accuracy requirements when controlling a relatively small EGR rate and a relatively large EGR rate.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, an EGR lift valve is provided, including: an actuator unit; a base body, the base body is connected to the actuator unit, a valve shaft is arranged in the base body, the valve shaft is provided with a first valve core and a second valve core, the first valve core and the second valve core are arranged at intervals, a first flow space is formed between the first valve core and the base body, a second flow space is formed between the second valve core and the base body, the first flow space is smaller than the second flow space, the valve shaft drives the first valve core and the second valve core to move along the axial direction of the valve shaft to adjust the size of the flow area of ​​the first flow space and the second flow space.

[0005] Furthermore, the base includes a first component segment, a second component segment and a third component segment along the axial direction, the first end of the first component segment is connected to the execution unit, the second end of the first component segment is connected to the first end of the second component segment, the second end of the second component segment is connected to the first end of the third component segment, the inner diameters of the first component segment and the third component segment are set to be the same, and the inner diameter of the second component segment is smaller than the inner diameters of the first component segment and the third component segment.

[0006] Furthermore, the base includes a first valve seat and a second valve seat, the second end of the first component segment is connected to the first end of the second component segment through the first valve seat, and the second end of the second component segment is connected to the first end of the third component segment through the second valve seat.

[0007] Furthermore, an air inlet is provided at the second end of the third group of segments.

[0008] Furthermore, the side wall of the first group of segments is provided with an air outlet.

[0009] Furthermore, the second valve core has a closing position for closing the second circulation space and an opening position for opening the second circulation space. When the second valve core is in the closed position, the flow area of ​​the first circulation space is the largest. In the process of the valve shaft driving the second valve core to move from the closed position to the open position, the flow area of ​​the first circulation space is gradually reduced, and the flow area of ​​the second circulation space is gradually increased.

[0010] Furthermore, the structure of the first valve core is configured differently from the structure of the second valve core.

[0011] Furthermore, the first valve core has a valve core body and a valve core surround, the valve core surround is extended along the circumference of the valve core body, and a first flow space is formed between the outer peripheral surface of the valve core surround and the first valve seat. The first flow space is an annular structure, and the valve core surround and the valve core body are arranged to form a valve body structure with an opening on one side, wherein the opening is arranged toward the side of the execution unit, the outer diameter of the valve core surround is gradually increased toward the side of the execution unit, and the inner diameter of the first valve seat is gradually increased toward the side of the execution unit. The execution unit controls the movement of the first valve core to change the distance between the valve core surround and the side wall of the first valve seat, wherein the valve core surround has a first closed position that fits with the side wall of the first valve seat.

[0012] Furthermore, when the first valve core is in the first closed position, the second valve core is in the open position. When the second valve core is in the closed position, the valve core surround and the first valve seat side wall are arranged with a distance, and the first valve core is in the first open position to open the first flow space.

[0013] According to another aspect of the present invention, an engine is provided, comprising an EGR poppet valve, wherein the EGR poppet valve is the above-mentioned EGR poppet valve.

[0014] By applying the technical solution of the present invention, when a larger EGR rate range is to be achieved, the size of the flow area of ​​the second circulation space is adjusted by controlling the stroke of the second valve core to achieve the purpose of increasing the EGR rate. When a smaller EGR rate is to be achieved, the size of the flow area of ​​the first circulation space is adjusted by controlling the stroke of the first valve core to achieve the purpose of reducing the EGR rate, thereby meeting both the control accuracy requirements at a larger EGR rate and the control accuracy requirements at a smaller EGR rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 A schematic structural diagram of a first embodiment of an EGR poppet valve according to the present invention is shown;

[0017] Figure 2 A schematic structural diagram of a second embodiment of an EGR poppet valve according to the present invention is shown;

[0018] Figure 3 A schematic structural diagram of a third embodiment of an EGR poppet valve according to the present invention is shown;

[0019] Figure 4 A schematic structural diagram of a fourth embodiment of an EGR poppet valve according to the present invention is shown;

[0020] Figure 5 FIG. 1 is a schematic structural diagram of a fifth embodiment of an EGR lift valve according to the present invention.

[0021] The above drawings include the following reference numerals:

[0022] 1. Execution unit;

[0023] 2. Valve shaft;

[0024] 3. First valve core; 300. Valve core body; 301. Valve core enclosure; 31. First flow space;

[0025] 4. Second valve core; 41. Second flow space;

[0026] 5. Base; 51. First component section; 511. Air outlet; 52. Second component section; 53. Third component section; 531. Air inlet; 54. First valve seat; 55. Second valve seat. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0031] Combine Figures 1 to 5 As shown, according to a specific embodiment of the present application, an EGR lift valve is provided.

[0032] Specifically, if Figure 1 As shown, the EGR poppet valve includes an actuator 1 and a base 5, the base 5 is connected to the actuator 1, a valve shaft 2 is provided in the base 5, the valve shaft 2 is provided with a first valve core 3 and a second valve core 4, the first valve core 3 and the second valve core 4 are arranged at intervals, a first flow space 31 is formed between the first valve core 3 and the base 5, and a second flow space 41 is formed between the second valve core 4 and the base 5, the first flow space 31 is smaller than the second flow space 41, the valve shaft 2 drives the first valve core 3 and the second valve core 4 to move along the axial direction of the valve shaft 2 to adjust the size of the flow area of ​​the first flow space 31 and the second flow space 41.

[0033] By applying the technical solution of this embodiment, when achieving a larger EGR rate range, the flow area of ​​the second flow space is adjusted by controlling the stroke of the second valve core to achieve an increased EGR rate. When achieving a smaller EGR rate, the flow area of ​​the first flow space is adjusted by controlling the stroke of the first valve core to achieve a reduced EGR rate. This satisfies both the control accuracy requirements for larger and smaller EGR rates. Specifically, the actuator 1 is a motor, an electronic actuator, or other device capable of driving the valve shaft 2.

[0034] like Figure 2 、 Figure 3 As shown, the base 5 includes a first segment 51, a second segment 52, and a third segment 53 along the axial direction. The first end of the first segment 51 is connected to the actuator 1, the second end of the first segment 51 is connected to the first end of the second segment 52, and the second end of the second segment 52 is connected to the first end of the third segment 53. The inner diameters of the first segment 51 and the third segment 53 are set to be the same, and the inner diameter of the second segment 52 is set to be smaller than the inner diameters of the first segment 51 and the third segment 53. This arrangement allows the flow areas of the first flow space 31 formed between the first valve core 3 and the base 5 and the second flow space 41 formed between the second valve core 4 and the base 5 to be adjusted as the valve shaft 2 drives the first valve core 3 and the second valve core 4 to move along the axial direction of the valve shaft 2, thereby further achieving the purpose of adjusting the EGR rate.

[0035] Furthermore, the base 5 includes a first valve seat 54 and a second valve seat 55. The second end of the first component segment 51 is connected to the first end of the second component segment 52 via the first valve seat 54, and the second end of the second component segment 52 is connected to the first end of the third component segment 53 via the second valve seat 55. Specifically, a first flow space 31 is formed between the first valve core 3 and the first valve seat 54, and a second flow space 41 is formed between the second valve core 4 and the second valve seat 55. When the second valve core 4 throttles the airflow, the first valve core 3 has little or no effect on the airflow. When the first valve core 3 throttles the airflow, the second valve core 4 has little or no effect on the airflow.

[0036] The second end of the third segment 53 is provided with an air inlet 531. Furthermore, the sidewall of the first segment 51 is provided with an air outlet 511. Specifically, gas enters the EGR poppet valve through the air inlet 531, passes through the second flow space 41, and participates in flow regulation through the second flow space 41 and the first flow space 31 before being discharged through the air outlet 511.

[0037] Furthermore, the second valve core 4 has a closed position for closing the second circulation space 41 and an open position for opening the second circulation space 41. When the second valve core 4 is in the closed position, the flow area of ​​the first circulation space 31 is the largest. During the process of the valve shaft 2 driving the second valve core 4 to move from the closed position to the open position, the flow area of ​​the first circulation space 31 is gradually reduced, and the flow area of ​​the second circulation space 41 is gradually increased. Figure 1 The diagram shows the structure of the second valve core 4 in the closed position. At this point, the second valve core 4 is sealed from the base 5, preventing gas from entering the EGR poppet valve from the air inlet 531, and the EGR poppet valve is inoperative. To achieve a lower EGR rate, the valve shaft 2 drives the first and second valve cores 3 and 4 downward along the axial direction of the valve shaft 2 (i.e., in the direction of the valve shaft 2 axially and gradually away from the actuator 1) to open a greater stroke, thereby opening the second flow space 41 and gradually reducing the flow area of ​​the first flow space 31. By reducing the flow area of ​​the first flow space 31 and reducing the gas flow rate, a lower EGR rate is achieved. At this point, the second flow space 41 has little or no impact on the flow of air. This configuration further improves the operational reliability of the EGR poppet valve and meets the control accuracy requirements of the EGR poppet valve when achieving a lower EGR rate.

[0038] Specifically, the structure of the first valve core 3 is configured differently from that of the second valve core 4. In this embodiment, the second valve core 4 is annular, and the inner diameter of the second valve seat 55 is configured to gradually decrease toward the actuator 1. When the second valve core 4 is in the closed position, the outer edge of the second valve core 4 closely fits the sidewall of the second valve seat 55. This further ensures that the EGR poppet valve is sealed when not in operation, preventing gas from entering the interior of the EGR poppet valve through the air inlet 531.

[0039] Furthermore, the first valve core 3 has a valve core body 300 and a valve core enclosure 301, and the valve core enclosure 301 is extended along the circumference of the valve core body 300. A first flow space 31 is formed between the outer peripheral surface of the valve core enclosure 301 and the first valve seat 54. The first flow space 31 is an annular structure. The valve core enclosure 301 and the valve core body 300 are arranged to form a valve body structure with an opening on one side, wherein the opening is arranged toward the side of the actuator 1, the outer diameter of the valve core enclosure 301 is gradually increased toward the side of the actuator 1, and the inner diameter of the first valve seat 54 is gradually increased toward the side of the actuator 1. The actuator 1 controls the movement of the first valve core 3 to change the distance between the valve core enclosure 301 and the side wall of the first valve seat 54, wherein the valve core enclosure 301 has a first closed position that fits the side wall of the first valve seat 54. This arrangement is conducive to further adjusting the flow area in the first flow space 31 to adjust the gas flow in the first flow space 31, thereby achieving a smaller EGR rate and further improving the control accuracy of the EGR lift valve when achieving a smaller EGR rate.

[0040] When the first valve core 3 is in the first closed position, the second valve core 4 is in the open position. When the second valve core 4 is in the closed position, the valve core enclosure 301 is spaced apart from the sidewall of the first valve seat 54, and the first valve core 3 is in the first open position, opening the first flow space 31. This arrangement further ensures that when the second valve core 4 throttles the airflow, the first valve core 3 has little or no impact on the airflow. When the first valve core 3 throttles the airflow, the second valve core 4 has little or no impact on the airflow.

[0041] In another specific embodiment of the present application, since the maximum flow area of ​​the first circulation space 31 is smaller than the maximum flow area of ​​the second circulation space 41, when the gas moves in the second circulation space 41, under a certain pressure difference, the gas flow rate flowing through is relatively large, which can meet the flow rate required by the engine at the maximum EGR rate. When the gas moves in the first circulation space 31, under a certain pressure difference, the gas flow rate flowing through is relatively small, which can meet the control accuracy when the EGR rate is low. Figure 4 and Figure 5 As shown, when a larger EGR rate range is achieved, the stroke of the second valve core 4 is controlled by the execution unit 1 to adjust the flow area of ​​the second circulation space 41 to perform flow regulation. Since the flow curve of the gas in the second circulation space 41 is larger and steeper, a larger EGR rate can be achieved within a certain resistance loss, meeting the engine's requirements for a larger EGR rate. When the engine wants to achieve a smaller EGR rate, the stroke of the first valve core 3 is controlled by the execution unit 1 to adjust the EGR rate. Since the flow curve of the gas in the first circulation space 31 is smaller and flatter, the control accuracy can be increased. This arrangement allows the EGR lift valve to achieve two different flow curves under the same pressure difference. In the first half of the stroke of the valve shaft 2, a larger and steeper flow curve is achieved, such as Figure 4 As shown in FIG, in the second half of the valve shaft 2 stroke, a smaller and gentler flow curve can be achieved, such as Figure 5 shown.

[0042] In another specific embodiment of the present application, the change from a steeper flow curve to a flatter flow curve may be a sudden change, such as Figure 4 , or it can be a gradient, such as Figure 5 The flow curve is designed according to the engine requirements. The change of the flow curve is achieved by reasonably designing the layout and structure between the first valve core 3, the second valve core 4 and the base 5.

[0043] According to another specific embodiment of the present application, an engine is provided, including an EGR poppet valve, wherein the EGR poppet valve is the EGR poppet valve of the aforementioned embodiment. Because the engine utilizes the EGR poppet valve of the aforementioned embodiment, the technical effect of achieving relatively precise control accuracy of the EGR poppet valve is achieved when controlling both relatively low and relatively high EGR rates. Specifically, when achieving a relatively low EGR rate range, i.e., when the EGR flow rate is low, the flow curve of the EGR poppet valve is relatively low, which is beneficial for improving control accuracy. When achieving a relatively high EGR rate range, the flow curve of the EGR poppet valve is relatively high, which is beneficial for ensuring intake air volume.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] In addition to the above, it should be noted that references to "one embodiment," "another embodiment," "an embodiment," and the like in this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also falls within the scope of the present invention.

[0046] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0047] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An EGR poppet valve, characterized in that: include: Execution unit (1); A base (5), the base (5) is connected to the actuator (1), a valve shaft (2) is provided in the base (5), the valve shaft (2) is provided with a first valve core (3) and a second valve core (4), the first valve core (3) and the second valve core (4) are arranged at intervals, a first flow space (31) is formed between the first valve core (3) and the base (5), a second flow space (41) is formed between the second valve core (4) and the base (5), the maximum flow area of ​​the first flow space (31) is smaller than the maximum flow area of ​​the second flow space (41), the valve shaft (2) drives the first valve core (3) and the second valve core (4) to move along the axial direction of the valve shaft (2) to adjust the size of the flow area of ​​the first flow space (31) and the second flow space (41); The base body (5) includes a first component segment (51), a second component segment (52) and a third component segment (53) in the axial direction. The second end of the third component segment (53) is provided with an air inlet (531). The side wall of the first component segment (51) is provided with an air outlet (511). The second valve core (4) has a closed position for closing the second circulation space (41) and an open position for opening the second circulation space (41). When the second valve core (4) is in the closed position, the flow of the first circulation space (31) is reduced. The area is the largest. During the process in which the valve shaft (2) drives the second valve core (4) to move from the closed position to the open position, the flow area of ​​the first circulation space (31) is gradually reduced, and the flow area of ​​the second circulation space (41) is gradually increased. The gas enters from the air inlet (531) and then enters the EGR lift valve through the second circulation space (41), participates in flow regulation through the second circulation space (41) and the first circulation space (31), and is finally discharged from the air outlet (511).

2. The EGR poppet valve according to claim 1, characterized in that The first end of the first component segment (51) is connected to the execution unit (1), the second end of the first component segment (51) is connected to the first end of the second component segment (52), the second end of the second component segment (52) is connected to the first end of the third component segment (53), the inner diameters of the first component segment (51) and the third component segment (53) are set to be the same, and the inner diameter of the second component segment (52) is set to be smaller than the inner diameters of the first component segment (51) and the third component segment (53).

3. The EGR poppet valve according to claim 2, characterized in that: The base (5) includes a first valve seat (54) and a second valve seat (55), the second end of the first component segment (51) is connected to the first end of the second component segment (52) through the first valve seat (54), and the second end of the second component segment (52) is connected to the first end of the third component segment (53) through the second valve seat (55).

4. The EGR poppet valve according to claim 1, characterized in that The structure of the first valve core (3) is set differently from the structure of the second valve core (4).

5. The EGR poppet valve according to claim 3, characterized in that: The first valve core (3) comprises a valve core body (300) and a valve core enclosure (301), wherein the valve core enclosure (301) is arranged to extend along the circumference of the valve core body (300), and the first flow space (31) is formed between the outer peripheral surface of the valve core enclosure (301) and the first valve seat (54), and the first flow space (31) is an annular structure, and the valve core enclosure (301) and the valve core body (300) are arranged to form a valve body structure with an opening on one side, wherein the opening faces the actuator. The actuator (1) is provided on one side of the actuator unit (1), the outer diameter of the valve core enclosure (301) is gradually increased toward the side of the actuator unit (1), the inner diameter of the first valve seat (54) is gradually increased toward the side of the actuator unit (1), and the actuator unit (1) controls the movement of the first valve core (3) to change the distance between the valve core enclosure (301) and the side wall of the first valve seat (54), wherein the valve core enclosure (301) has a first closed position that is in contact with the side wall of the first valve seat (54).

6. The EGR poppet valve according to claim 5, characterized in that When the first valve core (3) is located at the first closed position, the second valve core (4) is located at the open position. When the second valve core (4) is located at the closed position, the valve core enclosure (301) is spaced apart from the side wall of the first valve seat (54). The first valve core (3) is located at the first open position for opening the first flow space (31).

7. An engine, characterized in that: It comprises an EGR poppet valve, and the EGR poppet valve is the EGR poppet valve according to any one of claims 1-6.

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