Exhaust gas control method, device, vehicle and computer-readable storage medium

Abstract

An embodiment of the present application discloses an exhaust gas gate control method, device, vehicle, and computer-readable storage medium. The exhaust gas gate control method includes: obtaining the opening degree of the exhaust gas gate relative to the exhaust gas gate seat; when the opening degree is less than a preset threshold value, performing open-loop control on the exhaust gas gate until the exhaust gas gate is closed. The exhaust gas gate control method disclosed in the present application can, when the opening degree of the exhaust gas gate relative to the exhaust gas gate seat is less than or equal to the preset threshold value, achieve the closing of the exhaust gas gate through open-loop control, avoiding the problem that the exhaust gas gate cannot be successfully closed due to the offset of the exhaust gas gate seat.

Description

Technical Field

[0001] This application relates to the technical field of vehicles, and in particular to a wastegate control method, a wastegate control device, a vehicle, and a computer-readable storage medium. Background Art

[0002] In an automotive engine, the exhaust of the wastegate bypass valve of the turbocharger is an important means for controlling the work done by the turbine, directly affecting the boost pressure. Usually, the wastegate bypass valve of the turbocharger can be directly driven and controlled by an electric motor. The electric motor can confirm the position of the wastegate based on the built-in position sensor. When a larger boost pressure is required, the corresponding wastegate seat position is determined, that is, the corresponding preset position is set. However, due to the thermal expansion and contraction of the wastegate seat material during the cold and hot alternation of the turbocharger, the position of the wastegate seat deviates. If the set position under closed-loop control is still used as the closing position of the wastegate, there will be a problem that the wastegate and the wastegate seat cannot be successfully closed. Summary of the Invention

[0003] To solve the above technical problems, embodiments of the present application provide a wastegate control method, a wastegate control device, a vehicle, and a computer-readable storage medium, which can achieve the successful closing of the wastegate.

[0004] According to one aspect of the embodiments of the present application, a wastegate control method is provided. The wastegate control method includes: obtaining the opening degree of the wastegate relative to the wastegate seat; when the opening degree is less than or equal to a preset threshold value, performing open-loop control on the wastegate until the wastegate is closed.

[0005] According to one aspect of the embodiments of the present application, a wastegate control device is provided. The device includes: an opening degree obtaining module configured to obtain the opening degree of the wastegate relative to the wastegate seat; a control module configured to perform open-loop control on the wastegate until the wastegate is closed when the opening degree is less than or equal to a preset threshold value.

[0006] According to one aspect of the embodiments of the present application, a vehicle is provided. The vehicle includes: one or more processors; a memory; one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the one or more processors, and the one or more application programs are configured to execute the wastegate control method as described in any one of the above.

[0007] According to one aspect of the embodiments of the present application, a computer-readable storage medium is provided, on which computer-readable instructions are stored. When the computer-readable instructions are executed by a processor of a computer, the computer is made to execute the wastegate control method as described above.

[0008] In the technical solution provided by the embodiment of the present application, when the opening degree of the wastegate relative to the wastegate seat is less than or equal to a preset threshold, the wastegate is controlled in an open-loop manner until the wastegate is closed. Thus, in the case where the position of the wastegate seat shifts due to thermal expansion and contraction, the wastegate can be controlled in an open-loop manner, so that the wastegate can be successfully closed at the position after the wastegate seat shifts.

[0009] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0011] Figure 1 is a schematic diagram showing the positional relationship between the wastegate and the wastegate seat when the supercharger operates from a hot state to a cold state;

[0012] Figure 2 is a schematic diagram showing the positional relationship between the wastegate and the wastegate seat when the supercharger operates from a cold state to a hot state;

[0013] Figure 3 is a partial structural schematic diagram of a turbocharger in an automobile;

[0014] Figure 4 is a partial structural schematic diagram between the wastegate and the wastegate seat in the turbocharger;

[0015] Figure 5 is a schematic diagram of an implementation environment related to the present application;

[0016] Figure 6 is a flowchart of a wastegate control method shown in an exemplary embodiment of the present application;

[0017] Figure 7 is Figure 6 a flowchart of an exemplary embodiment before step S620 in the wastegate control method shown;

[0018] Figure 8 is Figure 7 a flowchart of an exemplary embodiment of step S740 in the wastegate control method shown;

[0019] Figure 9 is Figure 6Flowchart of an exemplary embodiment of step S610 in the wastegate control method shown;

[0020] Figure 10 Schematic diagram of the relationship between the position of the wastegate and the voltage;

[0021] Figure 11 is Figure 9 Flowchart of an exemplary embodiment of step S930 in the wastegate control method shown;

[0022] Figure 12 Schematic diagram of the process of the wastegate control method shown in an exemplary application scenario;

[0023] Figure 13 Block diagram of the wastegate control device shown in an exemplary embodiment of the present application;

[0024] Figure 14 Shows a schematic diagram of the structure of a computer system of an electronic device suitable for implementing the embodiments of the present application. Detailed implementation manners

[0025] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0026] The block diagrams shown in the drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0027] The flowcharts shown in the drawings are only exemplary illustrations, not necessarily including all contents and operations / steps, nor necessarily executed in the described order. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to the actual situation.

[0028] In the present application, "a plurality of" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0029] First of all, it should be noted that in the automotive industry, the exhaust of the wastegate of the turbocharger in the automotive engine, as a means of controlling the work done by the turbine, directly affects the boost pressure. Usually, the wastegate of the turbocharger can be controlled by an electric motor to move the wastegate towards the wastegate seat, causing the wastegate to close.

[0030] Based on the above wastegate control method, there is a problem that due to the thermal expansion and cold contraction of the wastegate seat material during the alternation between the hot state and the cold state of the turbocharger, the position of the wastegate seat shifts. The actual position of the shifted wastegate seat deviates from the set position, while the closing of the wastegate is still controlled with the set position of the wastegate seat as the target. Therefore, the following problems will occur:

[0031] Problem 1: When the supercharger runs from the hot state to the cold state, the cold-state wastegate seat material shrinks, and the actual position is farther from the set position compared to the position of the wastegate. If the set position is used as the closing position, it will cause the problem that the wastegate cannot be closed tightly. The wastegate not being closed tightly will reduce the boost pressure, and further reduce the power and torque of the engine.

[0032] Exemplarily, reference can be made to Figure 1 , Figure 1 which shows the positional relationship between the wastegate and the wastegate seat when the supercharger runs from the hot state to the cold state. Figure 1 shows the fully open position, the theoretical position of the wastegate seat, and the actual position of the wastegate seat after cold-state contraction. The fully open position refers to the maximum opening position of the wastegate relative to the wastegate seat. The theoretical position of the wastegate seat is also the set position of the wastegate seat. Specifically, the set position of the wastegate seat refers to the target position for controlling the wastegate to move towards the wastegate seat, and the actual position refers to the position after the cold-state wastegate seat material shrinks when the supercharger runs from the hot state to the cold state. During the actual control of the wastegate closing process, the cold-state contraction makes Figure 1 the actual position of the wastegate seat in

[0033] farther from the set position compared to the position of the wastegate. When the wastegate moves to the set position, there is still a certain opening between it and the actual position, resulting in the problem that the wastegate cannot be closed tightly.

[0034] Exemplarily, reference can be made to Figure 2 , Figure 2 which shows the positional relationship between the wastegate and the wastegate seat when the supercharger runs from the cold state to the hot state. Figure 2Also shown therein are the fully open position, the set position of the wastegate seat, and the actual position of the wastegate seat after thermal expansion. Among them, the actual position refers to the position after the thermal expansion of the material of the hot-state wastegate seat when the supercharger operates from the cold state to the hot state. During the actual control of the wastegate, the thermal expansion causes Figure 2 the actual position of the wastegate seat in it to be closer to the position where the wastegate is located compared to the set position. The wastegate first moves to the actual position of the wastegate seat and then moves to the set position of the wastegate seat. Therefore, when the set position is used as the closing position of the wastegate, the wastegate will hit the wastegate seat in advance.

[0035] Based on this, to avoid the above problems, the embodiments of the present application propose a wastegate control method, a wastegate control device, a vehicle, and a computer-readable storage medium. Specifically, the opening of the wastegate relative to the wastegate seat is obtained; when the opening is less than or equal to a preset threshold, the wastegate is controlled in an open loop until the wastegate closes. Thus, it is possible to control the wastegate in an open-loop manner when the position of the wastegate seat shifts due to thermal expansion and contraction, so that the wastegate can be successfully closed at the position after the shift of the wastegate seat. Specifically:

[0036] On the one hand, it can avoid the problem that when the wastegate seat is in the thermal expansion state, the actual position of the wastegate seat is closer to the position of the wastegate, and when the set position of the wastegate seat at a farther distance is used as the closing position, the wastegate will hit the wastegate seat in advance;

[0037] On the other hand, it can avoid the problem that when the wastegate seat is in the cold contraction state, the actual position of the wastegate seat is farther away from the position of the wastegate, and when the set position at a closer distance is used as the closing position, there will be a certain opening between the wastegate and the wastegate seat, resulting in the problem that the wastegate cannot be closed tightly.

[0038] Reference can be made to Figure 3 , Figure 3 which shows a partial structural schematic diagram of a turbocharger in an automobile. The partial structure of the turbocharger can be used to implement the wastegate control method of the embodiments of the present application. Specifically, the turbocharger 30 includes a motor 31, a connecting rod 32, a motor-end rocker arm 33, a volute 34, a bushing 35, a volute-end rocker arm 36, a wastegate 37, a wastegate shaft 38, and a wastegate seat 39.

[0039] Among them, the motor 31 is connected to the motor end rocker arm 33. One end of the connecting rod 32 is connected to the motor end rocker arm 33, and the other end is connected to the turbine end rocker arm 36. The turbine end rocker arm 36 is connected to the wastegate 37 through the wastegate shaft 38, thereby controlling the movement of the wastegate 37 towards the wastegate seat 39. During the process of controlling the wastegate, the motor 31 pushes the turbine end rocker arm 36 to rotate through the connecting rod 32. The turbine end rocker arm 36 controls the wastegate 37 to rotate accordingly through the wastegate shaft 38, so that the wastegate 37 can be pushed to rotate from the maximum opening position into the exhaust gas flow passage of the volute 34 and fit tightly with the wastegate seat 39 in the volute 34. Conversely, it can also be pushed from the tightly fitting position to the maximum opening position.

[0040] For the structural connection relationship between the wastegate and the wastegate seat, reference can be made to 4. As shown in 4, the wastegate can move towards the position where the wastegate seat is located under control to achieve the closing of the wastegate, or it can move away from the position where the wastegate seat is located under control to achieve the opening of the wastegate.

[0041] Figure 5 is a schematic diagram of an implementation environment involved in the present application. As Figure 5 shown, during the wastegate control process, the controller 510 can obtain the opening of the wastegate relative to the wastegate seat from the vehicle-mounted component 520, and determine whether the opening of the wastegate relative to the wastegate seat is less than or equal to a preset threshold. If so, open-loop control is performed on the wastegate to control the wastegate to move towards the wastegate seat until the wastegate is closed.

[0042] Among them, the vehicle-mounted component 520 can be a motor, a connecting rod, a motor end rocker arm, a volute, a bushing, a turbine end rocker arm, a wastegate, a wastegate shaft, and a wastegate seat, etc. Figure 5 The controller 510 shown can be any controller that supports data acquisition and processing, such as a smart phone, an in-vehicle computer, a tablet computer, a laptop computer, or a wearable device, etc., but is not limited thereto. Figure 5 The vehicle-mounted controller 510 shown can be a server. For example, it can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers. It can also be a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN (Content Delivery Network), and big data and artificial intelligence platforms. There is no limitation here either. The vehicle-mounted controller 510 can communicate with the vehicle-mounted component 520 through wireless networks such as 3G (the third generation of mobile information technology), 4G (the fourth generation of mobile information technology), and 5G (the fifth generation of mobile information technology). There is no limitation here either.

[0043] Please refer to Figure 6 ,Figure 6 is a flowchart of an exhaust gas gate control method shown in an exemplary embodiment of the present application. This method can be applied to Figure 5 the shown implementation environment and is specifically executed by the controller 510 in this implementation environment. It should be understood that this method can also be applicable to other exemplary implementation environments and be specifically executed by devices in other implementation environments. This embodiment does not limit the implementation environment applicable to this method.

[0044] Next, the exhaust gas gate control method proposed in the embodiments of the present application will be introduced in detail with the exhaust gas gate control device as the specific execution entity.

[0045] As Figure 6 shown, in an exemplary embodiment, the exhaust gas gate control method at least includes steps S610 to S620, which are introduced in detail as follows:

[0046] Step S610, obtain the opening degree of the exhaust gas gate relative to the exhaust gas gate seat.

[0047] The opening degree of the exhaust gas gate relative to the exhaust gas gate seat refers to the opening and closing degree between the position where the exhaust gas gate is located and the position where the exhaust gas gate seat is located. Among them, the opening and closing degree can be determined according to the angle ratio between the actual position where the exhaust gas gate is located and the position where the exhaust gas gate seat is located. Exemplarily, the angle between the fully open position and the position where the exhaust gas gate seat is located can be calculated, and the ratio of the angle between the actual position where the exhaust gas gate is located and the position where the exhaust gas gate seat is located to the angle between the fully open position and the position where the exhaust gas gate seat is located can be used as the opening degree of the exhaust gas gate relative to the exhaust gas gate seat.

[0048] Step S620, when the opening degree is less than or equal to a preset threshold value, perform open-loop control on the exhaust gas gate until the exhaust gas gate is closed.

[0049] The preset threshold value is the opening degree value used to determine the exhaust gas gate control mode, that is, the value used to determine whether the exhaust gas gate control device adopts open-loop control or closed-loop control. Exemplarily, if the opening degree of the exhaust gas gate relative to the exhaust gas gate seat is greater than the preset threshold value, it can be determined that the exhaust gas gate is far from the closed position, and the exhaust gas gate is controlled by means of closed-loop control; if the opening degree of the exhaust gas gate relative to the exhaust gas gate seat is less than or equal to the preset threshold value, it can be determined that the exhaust gas gate is close to the closed position, and the exhaust gas gate is controlled by means of open-loop control.

[0050] It should be noted that the preset threshold can be artificially set to a fixed value. Exemplarily, the preset threshold is determined based on a preset percentage of the angle between the fully open position and the fully closed position of the wastegate, where the preset percentage can be two percent. Since there are situations of running from the hot state to the cold state and from the cold state to the hot state during the alternation between the hot state and the cold state of the turbocharger, the preset thresholds in the two situations can be set to the same value; of course, different opening thresholds can also be set according to the two situations, that is, a threshold is set according to the cold shrinkage during the process of the turbocharger running from the hot state to the cold state, and another threshold is set according to the thermal expansion during the process of the turbocharger running from the cold state to the hot state. This embodiment does not limit this. Open-loop control refers to the wastegate control strategy corresponding to when the opening of the wastegate relative to the wastegate seat is less than or equal to the preset threshold, specifically the control method in which the wastegate control device controls the wastegate to move to the position after offsetting towards the wastegate seat; closed-loop control refers to the wastegate control strategy corresponding to when the opening of the wastegate relative to the wastegate seat is greater than the preset threshold, specifically the control method in which the wastegate control device controls the wastegate to move to the set position of the wastegate seat. The set position refers to the position where the wastegate seat is pre-set, that is, the position where the wastegate seat is before thermal expansion or cold shrinkage.

[0051] The closing of the wastegate includes the closing achieved when the wastegate reaches the position where the wastegate is located. The specific position reached when the wastegate closes can be determined according to whether the wastegate seat is offset and the specific position of the offset. It should be noted that the closing of the wastegate can be a state without waste gas overflow. The situation where the wastegate moves to the position of the wastegate seat but there is actually waste gas overflow does not belong to the situation where the wastegate has been closed.

[0052] Considering that the position of the wastegate seat will drift due to the thermal expansion and cold shrinkage of the wastegate seat material during the alternation between the cold state and the hot state of the supercharger, in order to achieve the successful closing of the wastegate, the embodiment of the present application realizes dynamic control within and outside the threshold range according to the magnitude relationship between the opening of the wastegate relative to the wastegate seat and the preset threshold. Specifically, the wastegate control device judges whether the opening of the wastegate relative to the wastegate seat is greater than the preset threshold. If so, closed-loop control is performed on the wastegate; if it is judged that the opening of the wastegate relative to the wastegate seat is less than or equal to the set threshold, open-loop control is performed on the wastegate to achieve the closing of the wastegate.

[0053] It can be seen that when the opening of the wastegate of this embodiment relative to the wastegate seat is less than or equal to the preset threshold, open-loop control is performed on the wastegate until the wastegate closes. Thus, in the case where the position of the wastegate seat shifts due to thermal expansion and cold shrinkage, the wastegate can be controlled in an open-loop control manner, so that the wastegate can be successfully closed at the position after the wastegate seat shifts.

[0054] Based on the above embodiments, for an embodiment of the wastegate control method in the case of alternating cold and hot operation of the turbocharger, reference can be made to Figure 7 , Figure 7 which is a flowchart of the wastegate control method shown in another exemplary embodiment of the present application.

[0055] As Figure 7 shown, in an exemplary embodiment, before step S620 where when the opening degree is less than or equal to a preset threshold value, the wastegate is controlled in an open-loop manner until the wastegate is closed, the wastegate control method of this embodiment at least further includes steps S710 to S740, which are introduced in detail as follows:

[0056] Step S710, obtain the fully open position of the wastegate relative to the wastegate seat at the set position, and the actual position where the wastegate seat is located.

[0057] The fully open position refers to the position where the wastegate is located when the opening and closing degree of the wastegate relative to the wastegate seat at the preset position is the largest. For details, reference can be made to Figure 1 or Figure 2 the fully open position shown therein.

[0058] The actual position refers to the position where the wastegate seat is located after cold shrinkage or thermal expansion at the set position. For details, reference can be made to Figure 1 , as Figure 1 shown, the actual position of the wastegate seat after cold shrinkage refers to the position that moves from the set position to the side away from the fully open position of the set position. Continuing to refer to Figure 2 , as Figure 2 shown, the actual position of the wastegate seat after thermal expansion refers to the position that moves from the set position to the position between the fully open position and the set position.

[0059] The wastegate control device can obtain the fully open position of the wastegate and the actual position where the wastegate seat is located after cold shrinkage or thermal expansion through a position sensor provided at the motor.

[0060] Step S720, determine a preset threshold value according to the opening degree between the fully open position and the actual position.

[0061] The wastegate control device can calculate the opening degree between the fully open position and the actual position based on the fully open position and the actual position, and determine the product of the opening degree between the fully open position and the actual position and a preset value as the preset threshold value. It should be noted that the preset value can be two percent. The setting position of the threshold value can be referred to Figure 1 and Figure 2 , Figure 1 and Figure 2 The threshold position shown on the right side in the figure is the preset threshold value of this embodiment.

[0062] Step S730: When the opening degree of the wastegate relative to the wastegate seat is less than or equal to a preset threshold value, determine that the control strategy of the wastegate is an open-loop control strategy.

[0063] The wastegate control device determines whether the opening degree of the wastegate relative to the wastegate seat is less than or equal to the preset threshold value. If so, execute Step S740; if not, determine that the control strategy of the wastegate is a closed-loop control strategy.

[0064] Step S740: Control the wastegate to move towards the actual position of the wastegate seat in an open-loop control strategy until the wastegate closes.

[0065] Considering that if it is determined as an open-loop control strategy, it indicates that there is an offset in the position of the wastegate seat. When the wastegate control device controls the wastegate to close, it sets the actual position opening degree of the wastegate seat to 0, and controls the wastegate to move towards the actual position with an opening degree of 0 to achieve the closing of the wastegate. It should be noted that when the control strategy of the wastegate is determined as a closed-loop control strategy, the opening degree of the set position of the wastegate seat is 0.

[0066] It can be seen that the wastegate control method of this embodiment determines the preset threshold value based on the fully open position of the wastegate relative to the wastegate seat and the actual position of the wastegate seat after cold shrinkage or thermal expansion. Thus, it can determine the threshold value adapted to the cold shrinkage or thermal expansion state, and determine the corresponding control strategy according to the size of the threshold value and the opening degree, thereby improving the wastegate control accuracy; when the opening degree of the wastegate relative to the wastegate seat is less than or equal to the threshold value, control the wastegate to move towards the actual position with the target thrust corresponding to the cold shrinkage or thermal expansion state of the wastegate seat until the wastegate closes. On the one hand, it can avoid the problem that when the wastegate seat is in the thermal expansion state, the actual position of the wastegate seat is closer to the wastegate position, and when the set position of the farther wastegate seat is used as the closing position, the wastegate will hit the wastegate seat in advance; on the other hand, it can avoid the problem that when the wastegate seat is in the cold shrinkage state, the actual position of the wastegate seat is farther away from the wastegate position, and when the set position of the nearer wastegate seat is used as the closing position, there will be a certain opening degree between the wastegate and the wastegate seat, resulting in the problem that the wastegate cannot be closed tightly.

[0067] Based on the above embodiments, reference can be made to Figure 8 , Figure 8 which is a flowchart of the wastegate control method shown in another exemplary embodiment of the present application.

[0068] As Figure 8 shown, in an exemplary embodiment, the process of Step 740 controlling the wastegate to move towards the actual position of the wastegate seat in an open-loop control strategy until the wastegate closes at least further includes Step S810 to Step S820, which are introduced in detail as follows:

[0069] Step S810: Obtain the target thrust corresponding to the wastegate seat in the state of thermal expansion or cold contraction.

[0070] The target thrust can be a fixedly set force value. It can also be determined according to the resistance corresponding to the waste gas discharged by the wastegate seat in the cold contraction state. Exemplarily, the wastegate control device obtains the initial thrust applied by the motor to the wastegate, the mechanism resistance during the movement of the wastegate to the wastegate seat, and the waste gas resistance determined according to the waste gas discharged by the wastegate seat in the cold contraction state, and calculates the sum of the mechanism resistance and the waste gas resistance. Then, the difference between the initial thrust and the sum of the resistances is determined as the target thrust corresponding to the cold contraction or thermal expansion state. Among them, the mechanism resistance refers to the resistance opposite to the movement direction of the wastegate generated by the wastegate and the wastegate seat due to their own weights, etc. during the movement of the wastegate to the wastegate seat. The waste gas resistance refers to the resistance generated by the cold or hot waste gas discharged from the wastegate base, which prevents the wastegate from moving towards the wastegate seat.

[0071] Step S820: Push the wastegate towards the actual position of the wastegate seat with the target thrust until the wastegate closes.

[0072] When the wastegate control device determines that the opening degree of the wastegate relative to the wastegate seat is less than or equal to a preset threshold, it controls the wastegate with an open-loop control strategy, specifically pushing the wastegate towards the actual position of the wastegate seat with the target thrust until the wastegate closes.

[0073] It can be seen that the wastegate control method of this embodiment, when the opening degree of the wastegate relative to the wastegate seat is less than or equal to a preset threshold, pushes the valve towards the actual position of the wastegate seat with the target thrust corresponding to the open-loop control until the wastegate closes, thereby enabling the successful closing of the wastegate in the case of the offset of the wastegate seat position.

[0074] Figure 9 is a flowchart of the wastegate control method shown in another exemplary embodiment of the present application. In Figure 9 the shown embodiment, the opening degree of the wastegate relative to the wastegate seat at the set position is determined according to the position voltage corresponding to the position where the wastegate is located.

[0075] As Figure 9 shown, in an exemplary embodiment, step 610 of obtaining the opening degree of the wastegate relative to the wastegate seat at least further includes steps S910 to S930, which are introduced in detail as follows:

[0076] Step S910: Obtain the current position where the wastegate is located.

[0077] The wastegate control device can obtain the current position where the wastegate is located through a position sensor provided on the motor.

[0078] Step S920: Determine the current position voltage according to the current position.

[0079] The method by which the wastegate control device determines the current position voltage according to the current position of the wastegate can be through look-up table, or can be determined by calculating through a fitted curve. Exemplarily, reference can be made to Figure 10 , Figure 10 which shows the relationship between the position of the wastegate and the voltage. As Figure 10 shown, the wastegate from the fully closed position to the fully open position can determine the corresponding voltage value. It should be noted that, usually, during the process of the wastegate moving away from the wastegate base in the direction away from the fully closed position, the voltage value will gradually increase, that is, the opening of the wastegate is positively correlated with the voltage. Additionally, it should be noted that the bottom dead center in the figure refers to the position corresponding to the closest fit when the wastegate moves towards the wastegate seat relative to the fully closed position where the wastegate is closely attached to the wastegate seat, and the top dead center refers to the maximum degree when the wastegate moves in the opposite direction of the wastegate seat relative to the fully open position, and the corresponding position at this time.

[0080] Step S930: Determine the opening of the wastegate relative to the wastegate seat according to the current position voltage.

[0081] The wastegate control device calculates the opening of the wastegate relative to the wastegate seat according to the current voltage.

[0082] As an example, the embodiment of the present application can also adopt Figure 11 the steps S1110 to S1130 shown to implement step S930. The details are as follows:

[0083] Step S1110: Obtain the fully open position of the wastegate relative to the wastegate seat at the set position and the fully closed position of the wastegate relative to the wastegate seat at the set position.

[0084] The fully closed position refers to the position where the wastegate is closely attached to the wastegate seat at the set position.

[0085] The wastegate control device can obtain the fully open position of the wastegate relative to the wastegate seat at the set position and the fully closed position of the wastegate relative to the wastegate seat at the set position through a position sensor provided on the motor.

[0086] Step S1120: Calculate the position voltage difference between the fully open position voltage corresponding to the fully open position and the fully closed position voltage corresponding to the fully closed position.

[0087] The position voltage difference refers to the difference between the fully open position voltage corresponding to the fully open position and the fully closed position voltage corresponding to the fully closed position.

[0088] The wastegate control device calculates the fully open position voltage corresponding to the fully open position and the fully closed position voltage corresponding to the fully closed position through look-up tables or fitting functions, and calculates the voltage difference between the fully open position voltage and the fully closed position voltage to obtain the position voltage difference.

[0089] Step S1130: Calculate the percentage between the current position voltage and the position voltage difference to obtain the opening degree of the wastegate relative to the wastegate seat.

[0090] The wastegate control device determines the current position based on the position sensor provided on the motor, determines the corresponding current position voltage through look-up tables or fitting functions, and then calculates the percentage between the current position voltage and the position voltage difference to obtain the opening degree of the wastegate relative to the wastegate seat at the set position.

[0091] It can be seen that the opening degree o of the wastegate relative to the wastegate seat at the set position satisfies the following formula:

[0092]

[0093] It can be seen that the wastegate control method of this embodiment determines the opening degree of the wastegate relative to the wastegate seat at the set position through the current position voltage corresponding to the current position of the wastegate, thereby realizing the adaptive determination of the opening degree of the wastegate relative to the wastegate seat according to the position of the wastegate, and improving the accuracy of obtaining the opening degree of the wastegate relative to the wastegate seat.

[0094] In order to elaborate on the wastegate control method of the present application in detail, the following Figure 12 shows a simple flowchart to further illustrate the wastegate control method of the present application, details are as follows:

[0095] The wastegate control device obtains the opening degree of the wastegate relative to the wastegate seat, and determines whether the opening degree of the wastegate relative to the wastegate seat is less than the opening degree threshold. If so, set the opening degree at the actual position of the wastegate seat to 0, and control the wastegate to move towards the actual position of the wastegate with an open-loop control strategy until the wastegate closes; if not, control the wastegate to move towards the preset position of the wastegate with a closed-loop control strategy until the wastegate closes.

[0096] Figure 13 is a block diagram of a wastegate control device shown in an exemplary embodiment of the present application. The exemplary wastegate control device 1300 includes an opening degree acquisition module 131 and a control module 132. Specifically:

[0097] The opening degree acquisition module 131 is configured to obtain the opening degree of the wastegate relative to the wastegate seat.

[0098] The control module 132 is configured to perform open-loop control on the wastegate until the wastegate closes when the opening degree is less than or equal to the preset threshold.

[0099] In the exemplary wastegate control device, when the opening degree of the wastegate relative to the wastegate seat is less than or equal to a preset threshold value, the wastegate is controlled in an open-loop manner until the wastegate is closed. Thus, when the position of the wastegate seat shifts due to thermal expansion and contraction, the wastegate can be controlled in an open-loop manner, so that the wastegate can be successfully closed at the position after the shift of the wastegate seat.

[0100] Based on the above exemplary embodiment, before the control module 132, the exemplary wastegate control device 1300 further includes an actual position and full-open position acquisition module and a threshold determination module. Specifically:

[0101] The actual position and full-open position acquisition module is configured to acquire the full-open position of the wastegate relative to the wastegate seat at a set position, and the actual position where the wastegate seat is located, and the actual position is obtained based on the cold contraction or thermal expansion of the wastegate seat at the set position.

[0102] The threshold determination module is configured to determine a preset threshold value according to the opening degree between the full-open position and the actual position.

[0103] Based on the above exemplary embodiment, the control module 132 further includes a judgment module and a control sub-module. Specifically:

[0104] The judgment module is configured to determine that the control strategy of the wastegate is an open-loop control strategy when the opening degree of the wastegate relative to the wastegate seat is less than or equal to a preset threshold value.

[0105] The control sub-module is configured to control the wastegate to move towards the actual position of the wastegate seat in an open-loop control strategy until the wastegate is closed.

[0106] Based on the above exemplary embodiment, the control sub-module further includes a target thrust acquisition module and a wastegate closing module. Specifically:

[0107] The target thrust acquisition module is configured to acquire the target thrust corresponding to the wastegate seat in a thermally expanded or cold-contracted state.

[0108] The wastegate closing module is configured to push the wastegate towards the actual position of the wastegate seat with the target thrust until the wastegate is closed.

[0109] Based on the above exemplary embodiment, the target thrust acquisition module further includes a resistance acquisition module, a resistance sum calculation module, and a target thrust determination module. Specifically:

[0110] A resistance acquisition module, configured to acquire an initial thrust applied by a motor to an exhaust gas valve, a mechanism resistance during the movement of the exhaust gas valve to an exhaust gas valve seat, and an exhaust gas resistance determined according to the exhaust gas discharged from the exhaust gas valve seat in a thermal expansion or cold contraction state.

[0111] A resistance sum calculation module, configured to calculate the sum of the mechanism resistance and the exhaust gas resistance.

[0112] A target thrust determination module, configured to determine the difference between the initial thrust and the resistance sum as the corresponding target thrust in a thermal expansion or cold contraction state.

[0113] Based on the above exemplary embodiments, the opening degree acquisition module 131 further includes a current position acquisition module, a current position voltage acquisition module, and an opening degree acquisition sub-module. Specifically:

[0114] The current position acquisition module is configured to acquire the current position where the exhaust gas valve is located.

[0115] The current position voltage acquisition module is configured to determine the current position voltage according to the current position.

[0116] The opening degree acquisition sub-module is configured to determine the opening degree of the exhaust gas valve relative to the exhaust gas valve seat at a set position according to the current position voltage.

[0117] Based on the above exemplary embodiments, the opening degree acquisition sub-module further includes a fully closed position acquisition module, a current position voltage acquisition module, and a percentage calculation module. Specifically:

[0118] The fully closed position acquisition module is configured to acquire the fully open position of the exhaust gas valve relative to the exhaust gas valve seat at a set position and the fully closed position of the exhaust gas valve relative to the exhaust gas valve seat at a set position.

[0119] The position voltage difference calculation module is configured to calculate the position voltage difference between the fully open position voltage corresponding to the fully open position and the fully closed position voltage corresponding to the fully closed position.

[0120] The percentage calculation module is configured to calculate the percentage between the current position voltage and the position voltage difference to obtain the opening degree of the exhaust gas valve relative to the exhaust gas valve seat at a set position.

[0121] It should be noted that the exhaust gas valve control device provided in the above embodiments and the exhaust gas valve control method provided in the above embodiments belong to the same concept. The specific manners in which each module and unit perform operations have been described in detail in the method embodiments and will not be repeated here. In practical applications, the exhaust gas valve control device provided in the above embodiments can, according to needs, allocate the above functions to different functional modules, that is, divide the internal structure of the device into different functional modules to complete all or part of the functions described above, and this is not limited here either.

[0122] Embodiments of the present application also provide an electronic device, including: one or more processors; a storage device for storing one or more programs, which, when executed by the one or more processors, cause the electronic device to implement the wastegate control method provided in each of the above embodiments.

[0123] Figure 14 FIG. shows a schematic structural diagram of a computer system of an electronic device suitable for implementing embodiments of the present application. It should be noted that, Figure 14 The computer system 1400 of the electronic device shown is only an example and should not impose any limitation on the functions and usage scope of the embodiments of the present application.

[0124] As Figure 14 shown, the computer system 1400 includes a central processing unit (CPU) 1401, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 1402 or the program loaded from the storage section 1408 into the random access memory (RAM) 1403, such as executing the method described in the above embodiments. In the RAM 1403, various programs and data required for system operation are also stored. The CPU 1401, ROM 1402, and RAM 1403 are connected to each other via a bus 1404. An input / output (I / O) interface 1405 is also connected to the bus 1404.

[0125] The following components are connected to the I / O interface 1405: an input section 1406 including a keyboard, a mouse, etc.; an output section 1407 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc. and a speaker, etc.; a storage section 1408 including a hard disk, etc.; and a communication section 1409 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 1409 performs communication processing via a network such as the Internet. A drive 1410 is also connected to the I / O interface 1405 as required. A removable medium 1411, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 1410 as required so that a computer program read from it can be installed into the storage section 1408 as required.

[0126] In particular, according to an embodiment of the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication section 1409, and / or installed from the removable medium 1411. When the computer program is executed by the central processing unit (CPU) 1401, various functions defined in the system of the present application are executed.

[0127] It should be noted that the computer-readable medium shown in the embodiments of the present application can be a computer-readable signal medium, a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of the computer-readable storage medium may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable computer program. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The computer program included on the computer-readable medium can be transmitted by any suitable medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0128] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present application. Among them, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the above-mentioned module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram or flowchart, as well as the combination of blocks in the block diagram or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0129] The units described in the embodiments of the present application can be implemented in software or in hardware, and the described units can also be provided in a processor. Among them, the names of these units do not constitute a limitation to the units themselves in some cases.

[0130] Another aspect of the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the wastegate control method as described above. The computer-readable storage medium can be included in the electronic device described in the above embodiments, or can exist separately without being assembled into the electronic device.

[0131] Another aspect of the present application also provides a computer program product or a computer program, which includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the wastegate control methods provided in the above various embodiments.

[0132] The above content is only a preferred exemplary embodiment of the present application and is not used to limit the implementation of the present application. Those of ordinary skill in the art can easily make corresponding adaptations or modifications according to the main concept and spirit of the present application. Therefore, the protection scope of the present application should be subject to the protection scope required by the claims.

Claims

1. An exhaust gas gate control method, characterized in that, the method includes: Obtaining the opening degree of the exhaust gas gate relative to the exhaust gas gate seat; Obtaining the fully open position of the exhaust gas gate relative to the exhaust gas gate seat at the set position and the actual position of the exhaust gas gate seat, where the actual position is obtained based on the cold shrinkage or thermal expansion of the exhaust gas gate seat at the set position; Calculating the product of the opening degree between the fully open position and the actual position and a preset value to determine the preset threshold value with this product; When the opening degree is less than or equal to the preset threshold value, perform open-loop control on the exhaust gas gate until the exhaust gas gate closes.

2. The method according to claim 1, characterized in that, the step of, when the opening degree is less than or equal to the preset threshold value, performing open-loop control on the exhaust gas gate until the exhaust gas gate closes includes: When the opening degree of the exhaust gas gate relative to the exhaust gas gate seat is less than or equal to the preset threshold value, determining that the control strategy of the exhaust gas gate is an open-loop control strategy; Controlling the exhaust gas gate to move towards the actual position of the exhaust gas gate seat with the open-loop control strategy until the exhaust gas gate closes.

3. The method according to claim 2, characterized in that, the step of, controlling the exhaust gas gate to move towards the actual position of the exhaust gas gate seat with the open-loop control strategy until the exhaust gas gate closes includes: Obtaining the target thrust corresponding to the exhaust gas gate seat in the state of thermal expansion or cold shrinkage; Pushing the exhaust gas gate towards the actual position of the exhaust gas gate seat with the target thrust until the exhaust gas gate closes.

4. The method according to claim 3, characterized in that, the step of obtaining the target thrust corresponding to the exhaust gas gate seat in the state of thermal expansion or cold shrinkage includes: Obtaining the initial thrust applied by the motor to the exhaust gas gate, the mechanism resistance during the movement of the exhaust gas gate to the exhaust gas gate seat, and the exhaust gas resistance determined according to the exhaust gas discharged from the exhaust gas gate seat in the state of thermal expansion or cold shrinkage; Calculating the sum of the mechanism resistance and the exhaust gas resistance; Determining the difference between the initial thrust and the sum of the resistances as the target thrust corresponding to the state of thermal expansion or cold shrinkage.

5. The method according to claim 1, characterized in that, the step of obtaining the opening degree of the exhaust gas gate relative to the exhaust gas gate seat includes: Obtaining the current position where the exhaust gas gate is located; Determining the current position voltage according to the current position; Determining the opening degree of the exhaust gas gate relative to the exhaust gas gate seat according to the current position voltage.

6. The method according to claim 5, characterized in that, the step of determining the opening degree of the exhaust gas gate relative to the exhaust gas gate seat according to the current position voltage includes: Obtaining the fully open position of the exhaust gas gate relative to the exhaust gas gate seat at the set position and the fully closed position of the exhaust gas gate relative to the exhaust gas gate seat at the set position; Calculating the position voltage difference between the fully open position voltage corresponding to the fully open position and the fully closed position voltage corresponding to the fully closed position; Calculate the percentage between the current position voltage and the difference in position voltages to obtain the opening degree of the wastegate relative to the wastegate seat.

7. A wastegate control device, characterized in that the device comprises: an opening degree acquisition module configured to acquire the opening degree of the wastegate relative to the wastegate seat; a control module configured to acquire the fully open position of the wastegate relative to the wastegate seat at a set position and the actual position where the wastegate seat is located, the actual position being obtained based on the cold shrinkage or thermal expansion of the wastegate seat at the set position; calculate the product between the opening degree between the fully open position and the actual position and a preset value to determine the preset threshold value; when the opening degree is less than or equal to the preset threshold value, perform open-loop control on the wastegate until the wastegate is closed.

8. A vehicle, characterized in that the vehicle comprises: one or more processors; a memory; one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, and the one or more applications are configured to execute the wastegate control method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that computer-readable instructions are stored thereon, and when the computer-readable instructions are executed by a processor of a computer, the computer is caused to execute the wastegate control method according to any one of claims 1 to 6 as described above.

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