An intake throttle valve and a control method of an intake throttle valve

Abstract

The application discloses an air intake throttle valve and a control method thereof. The air intake throttle valve comprises a valve body and a valve plate, and further comprises a venting piece which is installed on the valve body and located upstream of the valve plate. When the engine is in a heating mode, the opening degree of the valve plate is adjusted to a preset opening degree, which is the minimum opening degree for stabilizing the air intake pressure of the air intake throttle valve, so that the problem that the opening degree of the valve plate is located in a sensitive area and the valve plate shakes violently, resulting in a sharp fluctuation of the air intake amount, is solved. Meanwhile, the venting piece discharges the excess air, so that the actual air intake amount into the engine is the required air intake amount, the air intake requirement of the engine in the heating mode is met, and the emission and combustion stability of the engine in the initial cold start period are improved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to an intake throttle valve and a control method for the intake throttle valve. Background Art

[0002] The intake throttle valve is a critical component in an automobile's fuel supply system. Installed in the intake line of the internal combustion engine, it controls the amount of air entering the engine. When the engine load increases, the ECU controls the intake throttle valve's opening to increase to meet the demand for more air. When the engine load decreases or during the warm-up phase, the ECU controls the intake throttle valve's opening to decrease to reduce air demand.

[0003] like Figures 1-4 As shown, it is a structural diagram of the intake throttle valve in the related technology. The intake throttle valve includes a motor 01, a valve shaft 02 and a valve plate 03. The motor 01 controls the rotation of the valve shaft 02, and the valve shaft 02 drives the valve plate 03 to rotate to adjust the opening of the intake throttle valve.

[0004] Figure 5 is the opening characteristic curve of the intake throttle valve. According to the curve, when the opening of the intake throttle valve is between 0-20%, the relationship between the opening of the intake throttle valve and the intake volume is sensitive. Within the opening range of 0-20%, a change in the opening of the intake throttle valve will cause a sharp change in the air volume and unstable intake performance.

[0005] When the engine is operating in cold climates, the intake throttle valve opening needs to be reduced. Setting the intake throttle valve opening to a range of 0-20% puts the engine in heating mode to quickly raise its temperature and accelerate cold start efficiency. This opening range is sensitive to the intake throttle valve. Changes in throttle valve opening can lead to significant fluctuations in intake air volume. The difference between actual and required intake air volume can vary significantly, causing the ECU to frequently control the rotation of valve plate shaft 02, causing valve plate 03 to vibrate violently. This leads to significant fluctuations in intake air volume and increases the risk of engine cold start failure. Summary of the Invention

[0006] The present application proposes an intake throttle valve to reduce the risk of engine cold start failure. The present application also proposes a control method for the intake throttle valve.

[0007] In order to achieve the above-mentioned object, the present application provides an intake throttle valve, comprising a valve body;

[0008] The valve body includes a valve plate and a venting member, wherein the venting member is arranged on the valve body and located upstream of the valve plate, and is used to discharge excess intake air entering the valve body;

[0009] The excess intake air is the part of the actual intake air of the engine that exceeds the required intake air when the engine is in a heating mode and the valve disc is opened to a preset opening degree;

[0010] The preset opening degree is the minimum opening degree at which the intake air pressure of the intake throttle valve is stable.

[0011] Preferably, in the intake throttle valve, the venting member comprises a venting hole, a venting valve disc and a venting driving member;

[0012] The venting hole is arranged through the valve wall of the valve body to communicate the valve cavity of the valve body with the outside;

[0013] The venting valve disc is rotationally connected with the valve body, and the venting driving member is connected with the venting valve disc;

[0014] The venting driving member is configured to drive the venting valve disc to rotate so as to block or not block the venting hole.

[0015] Preferably, in the intake throttle valve, the venting member further comprises a leakage prevention valve disc and a leakage prevention driving member;

[0016] The leakage prevention valve disc is rotationally connected with the valve body, the leakage prevention valve disc is connected with the leakage prevention driving member, and the leakage prevention driving member is configured to drive the leakage prevention valve disc to rotate so as to block or not block the venting hole;

[0017] The venting hole is arranged at the lowest end of the valve body, and the leakage prevention valve disc is closer to the valve cavity of the valve body than the venting valve disc.

[0018] Preferably, in the intake throttle valve, the venting valve disc and the leakage prevention valve disc are rectangular valve discs, and the venting hole is a prismatic hole that is shaped to match the rectangular valve disc;

[0019] In a direction perpendicular to the axis of the valve body, the width of the venting hole is L, and 1.2D≤L≤2D, where D is the diameter of the valve disc shaft.

[0020] Preferably, in the intake throttle valve, the leakage prevention valve disc is located at one end of the venting hole that communicates with the valve cavity of the valve body;

[0021] One end of the leakage prevention valve disc that is closer to the valve disc is rotationally connected with the valve body;

[0022] The cavity wall of the valve body comprises a receiving groove that communicates with the venting hole, so that the leakage prevention valve disc can be rotated towards the valve disc to abut against the cavity wall of the valve body.

[0023] Preferably, in the intake throttle valve, the venting valve disc is located at one end of the venting hole that is away from the valve cavity of the valve body.

[0024] The hole wall of the vent hole is provided with a limiting boss for abutting against the vent valve plate when the vent valve plate rotates to an upper limit position.

[0025] Preferably, in the above-mentioned intake throttle valve, the vent hole is arranged obliquely along the movement direction of the intake in the valve body.

[0026] Preferably, in the above-mentioned intake throttle valve, the included angle between the valve plate shaft of the valve plate and the horizontal plane is 0°-180°.

[0027] A control method of an intake throttle valve, comprising:

[0028] When the engine is in a heating mode, the valve plate of the intake throttle valve is adjusted to open to a preset opening degree;

[0029] The venting part is opened to discharge the excess intake into the intake throttle valve;

[0030] The excess intake is the part of the actual intake of the engine exceeding the required intake when the engine is in the heating mode and the valve plate is opened to the preset opening degree.

[0031] The preset opening degree is the minimum opening degree of the intake pressure of the intake throttle valve.

[0032] Preferably, in the above-mentioned control method of the intake throttle valve, the venting part is opened, specifically:

[0033] The leak-proof valve plate is opened;

[0034] The vent valve plate is opened to a required opening degree, which is the opening degree capable of discharging the excess intake.

[0035] Preferably, in the above-mentioned control method of the intake throttle valve, when the engine is in a non-heating mode, the leak-proof valve plate is opened and the vent valve plate is closed to enable foreign matters in the intake to enter the vent hole.

[0036] Preferably, in the above-mentioned control method of the intake throttle valve, after the leak-proof valve plate is opened and the vent valve plate is closed to enable foreign matters in the intake to enter the vent hole when the engine is in the non-heating mode, the method further comprises judging whether the amount of foreign matters accumulated on the vent valve plate exceeds a preset amount, and when the amount of foreign matters accumulated on the vent valve plate exceeds the preset amount, the leak-proof valve plate is closed and the vent valve plate is opened to discharge the foreign matters in the vent hole.

[0037] Preferably, in the above-mentioned control method of the intake throttle valve, judging whether the amount of foreign matters accumulated on the vent valve plate exceeds the preset amount, specifically:

[0038] The engine speed, the actual intake flow and the mapping table of the preset torque basis value of the motor are used to obtain the preset torque basis value of the motor corresponding to the engine speed and the actual intake flow;

[0039] The preset torque basis value of the motor is corrected according to the actual intake pressure and the preset torque correction coefficient table of the motor to obtain the preset torque of the motor.

[0040] The actual torque of the motor is obtained.

[0041] The torque difference between the actual torque of the motor and the preset torque of the motor is obtained.

[0042] The torque difference and the torque difference threshold value are compared, and if the torque difference is greater than the torque difference threshold value, it is judged that the amount of foreign matter accumulated on the vent valve plate exceeds the preset amount.

[0043] Preferably, in the control method of the intake throttle valve, after comparing the torque difference and the torque difference threshold value, and if the torque difference is greater than the torque difference threshold value, it is judged that the amount of foreign matter accumulated on the vent valve plate exceeds the preset amount, the method further comprises:

[0044] When the torque difference is less than or equal to the torque difference threshold value, it is judged that the amount of foreign matter accumulated on the vent valve plate does not exceed the preset amount, and the leak-proof valve plate and the vent valve plate do not act.

[0045] The intake throttle valve provided by the embodiment of the application comprises a valve body and a valve plate, and further comprises a venting piece which is installed on the valve body and located upstream of the valve plate. In the scheme, when the engine is in a heating mode, the opening degree of the valve plate is adjusted to exceed 20%, so that the opening degree of the valve plate is maintained in a region where violent shaking of the valve plate is avoided or in a minimum opening degree at which the intake pressure of the intake throttle valve is stable in bench calibration, thereby solving the problem that when the engine is in the heating mode, the opening degree of the valve plate is located in a sensitive region and the valve plate shakes violently, resulting in a sharp fluctuation of the intake amount. Meanwhile, the venting piece discharges excess intake air, so that the actual intake amount into the engine is the required intake amount, the intake demand of the engine in the heating mode is met, and the emission and combustion stability of the engine in the early stage of cold start are improved.

[0046] The application also discloses a control method of an intake throttle valve, which is suitable for the intake throttle valve in any one of the above schemes. Since the intake throttle valve has the above technical effects, the control method of the intake throttle valve also has the same technical effects, which will not be described herein again. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application, and for those skilled in the art, other drawings can be obtained from the provided drawings without any creative effort, and the present application can also be applied to other similar scenarios according to the provided drawings. Unless it is obvious from the language environment or otherwise stated, the same reference numbers in the drawings represent the same structure or operation.

[0048] Figure 1 is a structural schematic diagram of an intake system provided by the prior art;

[0049] Figure 2 is a structural schematic diagram of an intake throttle valve provided by the prior art;

[0050] Figure 3 is a front view of the intake throttle valve provided by the prior art;

[0051] Figure 4 is a top view of the intake throttle valve provided by the prior art;

[0052] Figure 5 is an opening characteristic curve of the intake throttle valve provided by the prior art;

[0053] Figure 6 is a structural schematic diagram of an intake throttle valve provided by the embodiments of the present application;

[0054] Figure 7 is Figure 6 a sectional view along A-A in FIG. 4;

[0055] Figure 8 is Figure 7 a sectional view along B-B in FIG. 4;

[0056] Figure 9 is Figure 7 a partial enlarged view of I in FIG. 4;

[0057] Figure 10 is a structural schematic diagram of an exhaust of excess intake air of a vent provided by the embodiments of the present application.

[0058] Wherein:

[0059] 01-motor; 02-valve plate shaft; 03-valve plate; 04-throttle valve front pipeline; 05-engine intake pipe;

[0060] 1-valve body; 11-receiving groove; 2-valve plate; 3-vent; 31-vent hole; 32-vent valve plate; 33-vent driving member; 34-leakage prevention valve plate; 35-leakage prevention driving member; 36-limiting boss; 4-valve plate shaft. DETAILED DESCRIPTION

[0061] The application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, but not to limit the application. The described embodiments are only a part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the application.

[0062] It should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings. The embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0063] It should be understood that the "system", "device", "unit" and / or "module" used in the application is a method for distinguishing different components, elements, parts, sections or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

[0064] As shown in the application and claims, unless the context clearly indicates otherwise, "one", "a", "an" and / or "the" do not refer to the singular, but also include the plural. Generally, the terms "comprise" and "include" only indicate that the steps and elements explicitly identified are included, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The element defined by the statement "comprising a" does not exclude the presence of another identical element in the process, method, product or device comprising the element.

[0065] In the description of the embodiments of the application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this document is only a description of the association between the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, in the description of the embodiments of the application, "multiple" means two or more than two.

[0066] Hereinafter, the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0067] As Figure 3As shown, the motor 01 of the intake throttle valve receives the control signal of the engine ECU, controls the rotation of the intake throttle valve, changes the flow area of the intake throttle valve, and achieves the purpose of changing the intake flow and the intake pressure.

[0068] The inlet of the intake throttle valve has a pre-throttle pipeline 04, air flows into the pre-throttle pipeline 04, passes through the valve plate 03 of the intake throttle valve, and then flows into the engine intake pipe 05.

[0069] The motor 01 of the intake throttle valve needs to drive the valve shaft 02 of the intake throttle valve to rotate. In order to realize the rotation of the valve shaft 02, a gap needs to exist between the valve shaft 02 of the intake throttle valve and the mounting hole of the valve seat of the intake throttle valve.

[0070] Moisture is contained in the intake air. In order to reduce the moisture in the pre-throttle pipeline 04 from entering the gap between the valve shaft 02 and the mounting hole, the related art requires that the installation angle of the valve shaft 02 and the horizontal direction be not more than 20°.

[0071] When the engine is in a cold region, the moisture in the gap between the valve shaft 02 and the mounting hole has the risk of icing. At the same time, foreign matters such as dust in the intake air also enter the gap between the valve shaft 02 and the mounting hole, increasing the risk of the valve shaft 02 rotating and being stuck. Both of the above problems will cause the problem of uncontrollable intake of the intake throttle valve.

[0072] The valve shaft 02 is horizontally arranged, and the motor 01 of the intake throttle valve is located at one end of the axis direction of the valve shaft 02. Since the volume of the motor 01 is large, the engine arrangement needs to consider the avoidance of the motor 01, increasing the difficulty of the engine arrangement.

[0073] In a first aspect, the application discloses an intake throttle valve, which comprises a valve body 1, a motor, a valve plate 2 and a valve shaft 4. The valve plate 2 and the valve shaft 4 are installed in a valve cavity of the valve body 1, and the motor is installed outside the valve cavity of the valve body 1. The motor drives the valve shaft 4 to rotate, and the valve shaft 4 drives the valve plate 2 to rotate.

[0074] The intake throttle valve disclosed by the application further comprises a venting piece 3, which is installed on the valve body 1 and located upstream of the valve plate 2.

[0075] The venting piece 3 is used to discharge excess intake air of the valve body 1. The excess intake air is the part of the actual intake air of the engine that exceeds the required intake air (the required intake air is the intake amount of the intake throttle valve at the required opening degree under the corresponding working condition in the related art, and the required opening degree of the intake throttle valve is the opening degree of the intake throttle valve under the corresponding working condition in the related art) when the engine is in a heating mode, and the valve plate 2 is opened to a preset opening degree. The preset opening degree is the minimum opening degree at which the intake pressure of the intake throttle valve is stable.

[0076] The preset opening can be obtained based on the intake throttle valve opening characteristic curve or through bench calibration. Figure 5 As shown, when the preset opening is 0-20%, the direction of the intake throttle valve opening characteristic curve is relatively steep. If the opening of the valve plate 2 changes a little within this opening range, the intake air volume will change relatively greatly. After the preset opening exceeds 20%, the direction of the intake throttle valve opening characteristic curve begins to slow down. If the opening of the valve plate 2 changes a little within this opening range, the intake air volume will change relatively little. In this embodiment, the preset opening is 20%.

[0077] The preset opening is not limited to 20%. The preset opening is selected according to the working conditions of the engine and is not specifically limited here.

[0078] In the related art, when the engine is in heating mode, the opening of the valve plate 2 is less than 20%; in this solution, when the engine is in heating mode, the opening of the valve plate 2 is adjusted to more than 20%, so that the opening of the valve plate is maintained in an area where the valve plate 2 does not vibrate violently, or in other words, the minimum opening at which the intake pressure of the intake throttle valve is stable as shown in the bench calibration, thereby solving the problem that when the engine is in heating mode, the opening of the valve plate 2 is in a sensitive area and the valve plate vibrates violently, resulting in violent fluctuations in the intake volume; at the same time, the vent 3 discharges excess intake air to ensure that the actual intake volume entering the engine is the required intake volume, thereby improving the emission and combustion stability of the engine in the initial stage of cold start.

[0079] In some embodiments, the vent member 3 includes a vent hole 31 , a vent valve plate 32 and a vent driving member 33 .

[0080] The vent hole 31 is set through the valve wall of the valve body 1, and the vent hole 31 is used to connect the valve cavity of the valve body 1 with the outside world; the vent valve plate 32 is rotatably connected to the valve body 1, and the vent drive member 33 is connected to the vent valve plate 32.

[0081] The vent driver 33 is used to drive the vent valve disc 32 to rotate so that the vent valve disc 32 blocks the vent hole 31 or does not block the vent hole 31. Specifically, the vent driver 33 drives the vent valve disc 32 to rotate so that the vent valve disc 32 blocks the vent hole 31, and the intake air entering the valve body 1 cannot be discharged through the vent hole 31; the vent driver 33 drives the vent valve disc 32 to rotate so that the vent valve disc 32 does not block the vent hole 31, and the intake air entering the valve body 1 can be discharged through the vent hole 31.

[0082] When the engine is in heating mode, the opening of the valve plate 2 is adjusted to a preset opening, and the venting drive 33 drives the venting valve plate 32 to rotate so that the venting valve plate 32 does not block the venting hole 31, and the excess intake air entering the valve body 1 is discharged through the venting hole 31. Figure 10As shown; the engine is in non-heating mode, the opening of the valve plate 2 is adjusted to the required opening, the gas entering the valve body 1 has no excess intake, the venting driving member 33 drives the venting valve plate 32 to rotate, so that the venting valve plate 32 blocks the venting hole 31, and the intake gas entering the valve body 1 cannot be discharged through the venting hole 31.

[0083] In this embodiment, the venting valve plate 32 can be installed at any position in the venting hole 31, which can ensure that the venting hole 31 is blocked.

[0084] Optionally, the venting valve plate 32 is installed at one end of the venting hole 31 in the axial direction. In this embodiment, one end of the venting valve plate 32 is rotatably connected to the cavity wall of the valve body 1 through a rotating shaft, and the driving member is optionally an electric motor, which drives the rotating shaft to rotate, and then the rotating shaft drives the venting valve plate 32 to rotate; in this embodiment, the middle part of the venting valve plate 32 is rotatably connected to the hole wall of the venting hole 31 of the valve body 1 through a rotating shaft, and the rotating axis of the venting valve plate 32 is parallel to the plane where the venting valve plate 32 is located, and the driving member is optionally an electric motor, which drives the rotating shaft to rotate, and then the rotating shaft drives the venting valve plate 32 to rotate in the venting hole 31.

[0085] Optionally, the venting valve is installed in the venting hole 31. In this embodiment, the middle part of the venting valve plate 32 is rotatably connected to the hole wall of the venting hole 31 of the valve body 1 through a rotating shaft, and the rotating axis of the venting valve plate 32 is parallel to the plane where the venting valve plate 32 is located, and the driving member is optionally an electric motor, which drives the rotating shaft to rotate, and then the rotating shaft drives the venting valve plate 32 to rotate in the venting hole 31.

[0086] The driving member is installed on the valve body 1, and the driving member is located outside the valve cavity.

[0087] In some embodiments, the venting member 3 includes the venting hole 31, the venting valve plate 32, and the venting driving member 33, and further includes the leak-proof valve plate 34 and the leak-proof driving member 35.

[0088] The leak-proof valve plate 34 is rotatably connected to the valve body 1, the leak-proof driving member 35 is connected to the leak-proof valve plate 34, and the leak-proof driving member 35 is used to rotate the leak-proof valve plate 34, so that the leak-proof valve plate 34 blocks the venting hole 31 or does not block the venting hole 31.

[0089] In this embodiment, at least one of the leak-proof valve plate 34 and the venting valve plate 32 blocks the venting hole 31, and the venting hole 31 cannot realize the communication between the valve cavity and the outside; neither the leak-proof valve plate 34 nor the venting valve plate 32 blocks the venting hole 31, and the venting hole 31 realizes the communication between the valve cavity and the outside.

[0090] Specifically, when the engine is in heating mode, the opening of the valve plate 2 is adjusted to a preset opening, the vent drive 33 drives the vent valve plate 32 to rotate, and the anti-leakage drive 35 drives the anti-leakage valve plate 34 to rotate, so that the vent valve plate 32 and the anti-leakage valve plate 34 do not block the vent hole 31, and the valve cavity is connected to the outside world through the vent hole 31, and the excess intake air entering the valve body 1 is discharged through the vent hole 31.

[0091] Optionally, the anti-leakage valve disc 34 is fully opened, and the vent valve disc 32 is opened to a required opening.

[0092] If the user does not perform timely air filter maintenance, foreign matter such as dust may be present in the engine pipeline, and the dust and other foreign matter may be easily trapped in the gap between the valve shaft 4 and the mounting hole.

[0093] In this solution, the vent hole 31 is opened at the lowest end of the valve body 1. Figure 7 As shown, the anti-leakage valve disc 34 is closer to the valve cavity of the valve body 1 than the vent valve disc 32. When the engine is in non-heating mode, the opening of the valve disc 2 is adjusted to the required opening, and there is no excess intake air entering the valve body 1. The venting driver 33 drives the vent valve disc 32 to rotate, so that the vent valve disc 32 blocks the vent hole 31. At the same time, the anti-leakage driver 35 drives the anti-leakage valve disc 34 to rotate, so that the anti-leakage valve disc 34 does not block the vent hole 31. Dust and other foreign matter in the intake air will fall under the action of gravity, enter the vent hole 31 through the end of the vent hole 31 that is not blocked by the anti-leakage valve disc 34, and fall on the vent valve disc 32. Figure 9 The space formed by the vent valve plate 32 and the vent hole 31 is a foreign matter collection chamber.

[0094] When it is necessary to discharge foreign matter from the foreign matter collecting chamber, the anti-leakage driving member 35 drives the anti-leakage valve plate 34 to rotate, and the anti-leakage valve plate 34 blocks the vent hole 31 to prevent air leakage. At the same time, the vent driving member 33 drives the vent valve plate 32 to rotate downward to discharge foreign matter.

[0095] The switching between the collection state and the discharge state of the foreign matter collection chamber can optionally be determined based on the torque threshold of the emptying motor. When the torque of the emptying motor is greater than the torque calibration threshold, it means that the weight of the foreign matter on the emptying valve plate 32 exceeds the design range, and the foreign matter collection chamber is switched from the collection state to the discharge state.

[0096] Optionally, the switching between the collection state and the discharge state of the foreign matter collection chamber can also:

[0097] Based on a mapping table of engine speed, actual intake air flow and motor preset torque base value, a motor preset torque base value corresponding to the engine speed and actual intake air flow is obtained;

[0098] According to the actual intake pressure and the motor preset torque correction coefficient table, the motor preset torque base value is corrected to obtain the motor preset torque;

[0099] Get the actual torque of the motor;

[0100] Obtain the torque difference between the actual torque of the motor and the preset torque of the motor;

[0101] Compare the torque difference with the torque difference threshold. If the torque difference is greater than the torque difference threshold, it is determined that the amount of foreign matter accumulated on the vent valve plate 32 exceeds the preset amount, indicating that the weight of the foreign matter on the vent valve plate 32 exceeds the design range, and the foreign matter collection chamber is switched from the collection state to the discharge state.

[0102] like Figure 8 As shown, the vent valve disc 32 and the anti-leakage valve disc 34 are rectangular valve discs, and correspondingly, the vent hole 31 is a prismatic hole that matches the shape of the vent valve disc 32 and the anti-leakage valve disc 34 .

[0103] The vent valve plate 32 and the anti-leakage valve plate 34 are not limited to the above shapes, and can also be other shapes that can achieve the function of blocking or not blocking the vent hole 31, all of which are within the protection scope of this application.

[0104] Optionally, the vent valve plate 32 and the anti-leakage valve plate 34 are arranged at both ends of the vent hole 31 in the axial direction. The sizes of the vent valve plate 32 and the anti-leakage valve plate 34 can be slightly larger than the cross-sectional area of ​​the vent hole 31 to ensure that the vent valve plate 32 and the anti-leakage valve plate 34 seal the vent hole 31.

[0105] like Figure 8 As shown, along the direction perpendicular to the axis of the valve body 1, the width of the vent hole 31 is L, the diameter of the valve plate shaft 4 is D, and 1.2D≤L≤2D.

[0106] When L is less than 1.2D, foreign matter such as moisture and dust cannot be effectively collected, and cannot be prevented from entering the gap between the valve plate shaft 4 and the mounting hole of the intake throttle valve;

[0107] When L>2D, when the engine is in the heating mode, too much gas is discharged through the vent hole 31, which may easily cause insufficient intake air volume and cause cold start failure.

[0108] Optionally, the vent valve disc 32 and the anti-leakage valve disc 34 are respectively located at both ends of the axial direction of the vent hole 31, thereby increasing the space of the foreign matter collection chamber and reducing the difficulty of installing the vent valve disc 32 and the anti-leakage valve disc 34 on the valve body 1.

[0109] In this embodiment, the vent valve disc 32 rotates downward when not blocking the vent hole 31 , and the anti-leakage valve disc 34 rotates upward when not blocking the vent hole 31 .

[0110] Optionally, the rotation axes of the vent valve disc 32 and the anti-leakage valve disc 34 are located on the same side or both sides of the axial direction of the vent hole 31 .

[0111] The leakage prevention valve plate 34 is rotationally connected to the valve body 1 at one end close to the valve plate 2;

[0112] The cavity wall of the valve body 1 comprises a receiving groove 11 in communication with the vent hole 31, so that the leakage prevention valve plate 34 can be rotated towards the valve plate 2 to abut against the cavity wall of the valve body 1.

[0113] The receiving groove 11 provides a space for the rotation of the leakage prevention valve plate 34, so that the leakage prevention valve plate 34 can be rotated to a larger angle towards the valve plate 2. Optionally, the shape of the receiving groove 11 is adapted to the shape of the leakage prevention valve plate 34, and the leakage prevention valve plate 34 can be rotated to abut against the groove bottom of the receiving groove 11. When the foreign matter collecting cavity is in the collecting state, the leakage prevention valve plate 34 can ensure that the air inlet end of the vent hole 31 is not blocked and the air inlet is not blocked, thereby reducing the influence on the air inlet.

[0114] Optionally, the depth of the receiving groove 11 is greater than or equal to the thickness of the leakage prevention valve plate 34. After the leakage prevention valve plate 34 is rotated into the receiving groove 11, the leakage prevention valve plate 34 will not protrude from the cavity wall of the valve body 1, thereby reducing the interference with the air flow.

[0115] As shown in Figure 9 , the hole wall of the vent hole 31 is provided with a limiting boss 36. The limiting boss 36 is used to abut against the vent valve plate 32 when the vent valve plate 32 is rotated to the upper limit position. Optionally, the upper limit position is the horizontal position of the vent valve plate 32, at which the vent valve plate 32 can block the vent hole 31.

[0116] The vent valve plate 32 is matched with the limiting boss 36 through a sealing structure such as a sealing gasket, to realize the sealing function and avoid air leakage.

[0117] Optionally, the shape of the limiting boss 36 is adapted to the shape of the vent valve plate 32. After the vent valve plate 32 abuts against the limiting boss 36, the circumference of the vent valve plate 32 is matched with the limiting boss 36 to realize the sealing function.

[0118] When the engine is in the heating mode, excess air needs to be discharged through the vent hole 31. Optionally, the vent hole 31 is arranged to be inclined along the movement direction of the air in the valve body 1, to reduce the movement resistance when the air is discharged through the vent hole 31. As shown in Figure 7 , along the movement direction of the air in the valve body 1, the lower end of the vent hole 31 is closer to the valve plate 2 than the upper end of the vent hole 31.

[0119] Since the intake throttle valve disclosed in the application comprises the venting piece 3, the venting piece 3 can collect and discharge dust and other foreign matters, and the movement of the valve plate 2 of the intake throttle valve will not be stuck. In the scheme, the angle between the valve plate shaft 4 and the horizontal plane is 0°-180°, so that the valve plate shaft 4 can be designed according to the arrangement of the engine, and the flexibility and rationality of the engine arrangement are improved.

[0120] In a second aspect, the application further discloses a control method of an intake throttle valve, which is suitable for the intake throttle valve in any one of the above schemes. Since the intake throttle valve has the above technical effects, the control method of the intake throttle valve also has the same technical effects, which will not be repeated here.

[0121] The control method of the intake throttle valve comprises:

[0122] When the engine is in the heating mode, the valve plate 2 of the intake throttle valve is adjusted to open to a preset opening degree;

[0123] The venting piece 3 is opened to discharge the excess intake air entering the intake throttle valve;

[0124] The excess intake air is the part of the actual intake air of the engine that exceeds the required intake air when the engine is in the heating mode;

[0125] The preset opening degree is the minimum opening degree of the intake throttle valve at which the intake pressure is stable.

[0126] The preset opening degree of the intake throttle valve is greater than the required opening degree when the engine is in the heating mode, so that the problem of unstable engine intake performance caused by the shaking of the valve plate 2 when the engine is in the heating mode is solved; the excess intake air in the intake air before the throttle valve is discharged through the venting piece 3, and the remaining intake air after the discharge enters the engine intake pipe through the valve plate 2.

[0127] In the control method of the above intake throttle valve, the venting piece 3 is opened to discharge the excess intake air entering the intake throttle valve, specifically,

[0128] The leak-proof valve plate 34 is opened;

[0129] The venting valve plate 32 is opened to the required opening degree.

[0130] Since the preset opening degree of the valve plate 2 of the intake throttle valve is greater than the required opening degree when the engine is in the heating mode, the actual intake air amount entering the intake throttle valve is greater than the required intake air amount, and the required opening degree of the venting valve plate 32 is the opening degree at which the excess intake air can be discharged to meet the requirements of cold start.

[0131] In this embodiment, the leak-proof valve plate 34 can be completely opened or partially opened, and the specific opening degree is designed by the person skilled in the art according to the actual requirements.

[0132] The greater the difference between the preset opening degree of the intake throttle valve and the required opening degree of the intake throttle valve (the required opening degree of the intake throttle valve is the opening degree of the intake throttle valve corresponding to the working condition in the related art) is, the greater the opening degree of the vent valve 32 is, so as to effectively discharge the excess intake air.

[0133] Optionally, the obtaining of the required opening degree of the vent valve 32 comprises:

[0134] obtaining the required opening degree of the vent valve 32 according to the opening degree lookup table of the intake throttle valve, wherein the table is a table of the opening degree of the intake throttle valve and the required opening degree of the vent valve, and the opening degree of the intake throttle valve in the table is not located in the sensitive region of the valve opening degree.

[0135] When the engine is in the heating mode, the leak-proof valve 34 is always in the open state, and the vent valve 32 is always in the closed state.

[0136] Optionally, when the engine is in the non-heating mode, the leak-proof valve 34 is closed to prevent the gas entering the intake throttle valve from entering the vent hole 31; and optionally, the vent valve 32 is also closed.

[0137] Optionally, when the engine is in the non-heating mode, the leak-proof valve 34 is opened, the vent hole 31 is communicated with the valve cavity of the intake throttle valve; and the vent valve 32 is closed to prevent the vent hole 31 from being communicated with the outside, so as to avoid the intake air leakage and the foreign matter in the intake air from entering the vent hole 31, so as to achieve the collection of the foreign matter and reduce the foreign matter entering the engine intake pipe.

[0138] The foreign matter is collected in the vent hole 31, and the vent valve 32 can be opened after the engine operates for a preset time to discharge the foreign matter. It should be noted that at this time, the leak-proof valve 34 needs to be closed to prevent the intake air leakage.

[0139] The foreign matter is collected in the vent hole 31, and optionally, when the amount of the foreign matter accumulated on the vent valve 32 exceeds a preset amount, the foreign matter needs to be discharged.

[0140] Specifically, it is judged whether the amount of the foreign matter accumulated on the vent valve 32 exceeds the preset amount, and when the amount of the foreign matter accumulated on the vent valve 32 exceeds the preset amount, the leak-proof valve 34 is closed and the vent valve 32 is opened to discharge the foreign matter in the vent hole 31.

[0141] When the amount of the foreign matter accumulated on the vent valve 32 does not exceed the preset amount, the leak-proof valve 34 and the vent valve 32 are not actuated.

[0142] It is judged whether the amount of the foreign matter accumulated on the vent valve 32 exceeds the preset amount, and specifically,

[0143] The motor preset torque basic value corresponding to the engine speed and the actual intake flow is obtained based on a map of the engine speed, the actual intake flow and the motor preset torque basic value;

[0144] The motor preset torque is obtained by correcting the motor preset torque basic value according to a motor preset torque correction coefficient table and the actual intake pressure;

[0145] The motor actual torque is obtained;

[0146] The torque difference between the motor actual torque and the motor preset torque is obtained;

[0147] The torque difference and the torque difference threshold value are compared, and if the torque difference is greater than the torque difference threshold value, it is determined that the amount of foreign matter accumulated on the purge valve plate 32 exceeds the preset amount.

[0148] The map of the engine speed, the actual intake flow and the motor preset torque basic value has the actual intake flow as the horizontal coordinate and the engine speed as the vertical coordinate, and the motor preset torque basic value is a point in the coordinate system. The intersection point of the actual intake flow and the engine speed of the engine in the map in the coordinate system is the motor preset torque basic value.

[0149] The control method of the intake throttle valve disclosed in the application further comprises:

[0150] When the torque difference is less than or equal to the torque difference threshold value, it is determined that the amount of foreign matter accumulated on the purge valve plate 32 does not exceed the preset amount, and the leak prevention valve plate 34 and the purge valve plate 32 are not actuated.

[0151] The above description is only the preferred embodiment of the application and the explanation of the applied technical principles, and is not used to limit the application. The application can have various changes and variations for those skilled in the art. The application range involved in the application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by the combination of the above technical features or their equivalent features without departing from the above application concept. For example, the above features are replaced with the technical features disclosed in the application (but not limited to) having similar functions to form technical solutions.

Claims

1. An air intake throttle valve characterized by comprising: The valve body (1) comprises a valve plate (2) and a venting member (3) arranged in the valve body (1) upstream of the valve plate (2), the venting member (3) being used for discharging excess intake air into the valve body (1); The excess intake air is the part of actual intake air of the engine exceeding the required intake air when the engine is in a heating mode, the valve plate (2) being opened to a preset opening degree; The preset opening degree is the minimum opening degree of the intake throttle valve at which the intake air pressure is stable; The venting member (3) comprises a venting hole (31), a venting valve plate (32) and a venting driving member (33); The venting hole (31) is arranged through the valve wall of the valve body (1) to communicate the valve cavity of the valve body (1) with the outside; The venting valve plate (32) is rotationally connected with the valve body (1), and the venting driving member (33) is connected with the venting valve plate (32); The venting driving member (33) is used for driving the venting valve plate (32) to rotate so as to block or not to block the venting hole (31); The venting member (3) further comprises a leakage prevention valve plate (34) and a leakage prevention driving member (35); The leakage prevention valve plate (34) is rotationally connected with the valve body (1), the leakage prevention valve plate (34) is connected with the leakage prevention driving member (35), and the leakage prevention driving member (35) is used for driving the leakage prevention valve plate (34) to rotate so as to block or not to block the venting hole (31); The venting hole (31) is arranged at the lowest end of the valve body (1), and the leakage prevention valve plate (34) is closer to the valve cavity of the valve body (1) than the venting valve plate (32). The venting valve plate (32) and the leakage prevention valve plate (34) are rectangular valve plates, and the venting hole (31) is a prismatic hole matched with the rectangular valve plates in shape; 2. The air inlet throttle valve according to claim 1, characterized in that, In a direction perpendicular to the axis of the valve body (1), the width of the venting hole (31) is L, and 1.2D≤L≤2D, where D is the diameter of a valve plate shaft (4). The leakage prevention valve plate (34) is located at one end of the venting hole (31) communicating with the valve cavity of the valve body (1); 3. The air inlet throttle valve according to claim 1, characterized in that, One end of the leakage prevention valve plate (34) close to the valve plate (2) is rotationally connected with the valve body (1); The cavity wall of the valve body (1) comprises a receiving groove (11) communicating with the venting hole (31) so that the leakage prevention valve plate (34) can be rotated to abut against the cavity wall of the valve body (1) in the direction of the valve plate (2). The venting valve plate (32) is located at one end of the venting hole (31) away from the valve cavity of the valve body (1); 4. The air intake throttle valve according to any one of claims 2-3, characterized by, The hole wall of the venting hole (31) is provided with a limiting boss (36) for abutting against the venting valve plate (32) when the venting valve plate (32) is rotated to an upper limit position. The venting hole (31) is arranged obliquely along the movement direction of the intake air in the valve body (1).

5. The air inlet throttle valve according to claim 1, wherein The included angle between the valve plate shaft (4) of the valve plate (2) and the horizontal plane is 0°-180°.

6. The air inlet throttle valve according to claim 1, characterized in that, The application is suitable for the intake throttle valve according to any one of claims 1-6.

7. A control method of an intake throttle valve characterized by comprising: ​ The engine is in a heating mode, and a valve plate (2) of an intake throttle valve is opened to a preset opening degree; An emptying device (3) is opened to discharge excess intake air entering the intake throttle valve; The excess intake air is part of actual intake air of the engine exceeding required intake air when the engine is in the heating mode and the valve plate (2) is opened to the preset opening degree; The preset opening degree is a minimum opening degree at which intake air pressure of the intake throttle valve is stable.

8. The control method of the intake throttle valve according to claim 7, characterized by, The emptying device (3) is opened, specifically: The leak-proof valve plate (34) is opened; The emptying valve plate (32) is opened to a required opening degree, which is an opening degree at which the excess intake air can be discharged.

9. The control method of the intake throttle valve according to claim 8, characterized by, When the engine is in a non-heating mode, the leak-proof valve plate (34) is opened, and the emptying valve plate (32) is closed, so that foreign matters in intake air enter the emptying hole (31).

10. The control method of the intake throttle valve according to claim 9, characterized by, When the engine is in the non-heating mode, the leak-proof valve plate (34) is opened, and the emptying valve plate (32) is closed, so that foreign matters in intake air enter the emptying hole (31), and further comprising judging whether the amount of foreign matters accumulated on the emptying valve plate (32) exceeds a preset amount, and when the amount of foreign matters accumulated on the emptying valve plate (32) exceeds the preset amount, the leak-proof valve plate (34) is closed, and the emptying valve plate (32) is opened, so that foreign matters in the emptying hole (31) are discharged.

11. The control method of the intake throttle valve according to claim 10, characterized by, Judging whether the amount of foreign matters accumulated on the emptying valve plate (32) exceeds the preset amount, specifically: Obtaining a motor preset torque basic value corresponding to an engine speed and an actual intake air flow based on a mapping table of the engine speed, the actual intake air flow and the motor preset torque basic value; Correcting the motor preset torque basic value according to an actual intake air pressure and a motor preset torque correction coefficient table to obtain a motor preset torque; Obtaining a motor actual torque; Obtaining a torque difference between the motor actual torque and the motor preset torque; Comparing the torque difference with a torque difference threshold value, and if the torque difference is greater than the torque difference threshold value, judging that the amount of foreign matters accumulated on the emptying valve plate (32) exceeds the preset amount.

12. The control method of the intake throttle valve according to claim 11, characterized by, After comparing the torque difference with the torque difference threshold value, and if the torque difference is greater than the torque difference threshold value, judging that the amount of foreign matters accumulated on the emptying valve plate (32) exceeds the preset amount, further comprising: When the torque difference is less than or equal to the torque difference threshold value, judging that the amount of foreign matters accumulated on the emptying valve plate (32) does not exceed the preset amount, and the leak-proof valve plate (34) and the emptying valve plate (32) are not actuated.

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