A sequential supercharging engine and its transient loading method and device

Abstract

The present application provides a sequential supercharging engine and a method and device for transient loading thereof, relating to the field of electromechanical technology. The method comprises: obtaining in real time the rate of change of an operating parameter of a sequential supercharging engine, the sequential supercharging engine comprising multiple superchargers; if the rate of change of the operating parameter exceeds a preset threshold, determining that the sequential supercharging engine has undergone transient loading, and then controlling the intake and exhaust bypass valves of the sequential supercharging engine to open. In this manner, by using the rate of change of the operating parameter that can reflect the occurrence of transient loading of the sequential supercharger engine as a threshold, when the rate of change of the operating parameter exceeds the threshold, transient loading is performed, and the intake and exhaust bypass valves of the sequential supercharging engine are opened, thereby improving the responsiveness of the sequential supercharging engine during transient loading, preventing intake air backflow during loading, increasing the amount of air inflow before the supercharger vortex, and ensuring the smoothness and short duration of transient loading.

Description

Technical Field

[0001] The present application relates to the field of electromechanical technology, and in particular to a sequential supercharging engine and a transient loading method and device thereof. Background Art

[0002] Sequentially supercharged engines are used, for example, in marine diesel engines. During the loading process, sequentially supercharged engines often experience transient loading. However, during transient loading, the loading time can be prolonged due to factors such as supercharger switching, and the supercharger may even surge, potentially killing the engine. Summary of the Invention

[0003] In view of this, an embodiment of the present application provides a sequential supercharging engine and a transient loading method and device thereof, aiming to keep the sequential supercharging engine stable during the transient loading process and shorten the loading time.

[0004] In a first aspect, an embodiment of the present application provides a transient loading method for a sequentially supercharged engine, the method comprising:

[0005] Real-time acquisition of the rate of change of operating parameters of the sequentially supercharged engine;

[0006] If the rate of change of the operating parameter exceeds a preset threshold, it is determined that transient loading occurs in the sequentially supercharged engine, and the intake and exhaust bypass valves of the sequentially supercharged engine are controlled to open.

[0007] Optionally, after controlling the opening of the intake and exhaust bypass valves of the sequentially supercharged engine, the method further includes:

[0008] If the rate of change of the operating parameter is lower than the threshold, it is determined that the sequentially supercharged engine has entered a steady-state loading state, and the intake and exhaust bypass valves of the sequentially supercharged engine are controlled to be closed.

[0009] Optionally, the threshold is a supercharger threshold, which is the rate of change of the operating parameter when the number of superchargers currently in operation increases under the current sequential supercharging engine operating condition;

[0010] Before the operating parameter change rate exceeds a preset threshold, the method further includes:

[0011] Based on the current operating conditions of the sequentially supercharged engine and according to the number of superchargers currently in operation, a preset first correspondence is queried to determine the supercharger threshold; the first correspondence is a correspondence between the number of superchargers in operation and the rate of change of an operating parameter in each operating condition of the sequentially supercharged engine.

[0012] Optionally, the threshold is a throttle opening threshold, which is a rate of change of an operating parameter in response to a current rate of change of the throttle opening under the current operating condition of the sequentially supercharged engine;

[0013] Before the operating parameter change rate exceeds a preset threshold, the method further includes:

[0014] Based on the current operating conditions of the sequentially supercharged engine, according to the current throttle opening change rate, a preset second corresponding relationship is queried to determine the throttle opening threshold; the second corresponding relationship is the corresponding relationship between the throttle opening change rate and the operating parameter change rate in each operating condition of the sequentially supercharged engine.

[0015] Optionally, the threshold value includes a supercharger threshold value and a throttle opening threshold value, wherein the supercharger threshold value is the rate of change of the operating parameter when the number of superchargers currently in operation increases under the current sequentially supercharged engine operating condition; the throttle opening threshold value is the rate of change of the operating parameter in response to the current throttle opening change rate under the current sequentially supercharged engine operating condition;

[0016] Before the operating parameter change rate exceeds a preset threshold, the method further includes:

[0017] Based on the current operating condition of the sequentially supercharged engine and the number of superchargers currently in operation, a preset first correspondence relationship is queried to determine the supercharger threshold; the first correspondence relationship being a correspondence between the number of superchargers in operation and the rate of change of an operating parameter in each operating condition of the sequentially supercharged engine;

[0018] And, based on the current operating conditions of the sequentially supercharged engine, according to the current throttle opening change rate, query the preset second corresponding relationship to determine the throttle opening threshold; the second corresponding relationship is the corresponding relationship between the throttle opening change rate and the operating parameter change rate in each operating condition of the sequentially supercharged engine.

[0019] Optionally, the operating parameter change rate is the engine speed change rate or the circulating fuel supply change rate.

[0020] In a second aspect, the present application further proposes a transient loading device for a sequentially supercharged engine, the device comprising:

[0021] an acquisition module for acquiring in real time a rate of change of an operating parameter of a sequentially supercharged engine, wherein the sequentially supercharged engine includes a plurality of superchargers;

[0022] The first control module is configured to control the intake and exhaust bypass valves of the sequentially supercharged engine to open if the rate of change of the operating parameter exceeds a preset threshold and the sequentially supercharged engine is determined to be transiently loaded.

[0023] Optionally, the device further includes:

[0024] The second control module is configured to control the intake and exhaust bypass valves of the sequentially supercharged engine to close if the rate of change of the operating parameter is lower than the threshold and the sequentially supercharged engine enters a steady-state loading state.

[0025] Optionally, the operating parameter change rate is the engine speed change rate or the circulating fuel supply change rate.

[0026] In a third aspect, the present application proposes a sequential supercharging engine, which adopts the above-mentioned transient loading method of a sequential supercharging engine.

[0027] Embodiments of the present application provide a method, apparatus, and device for transient loading of a sequentially supercharged engine. During execution of the method, the rate of change of operating parameters of the sequentially supercharged engine, which includes multiple superchargers, is acquired in real time. If the rate of change of operating parameters exceeds a preset threshold, it is determined that the sequentially supercharged engine is experiencing transient loading, and the intake and exhaust bypass valves of the sequentially supercharged engine are controlled to open. Thus, by using the rate of change of operating parameters that can reflect transient loading of the sequentially supercharged engine as a threshold, transient loading is performed when the rate of change of operating parameters exceeds the threshold, and the intake and exhaust bypass valves of the sequentially supercharged engine are opened. This improves the responsiveness of the sequentially supercharged engine during transient loading, prevents intake air backflow during loading, increases the amount of air inflow into the supercharger vortex, and ensures the smoothness and short duration of transient loading. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in this embodiment or the prior art, the following briefly introduces the drawings required for use in the embodiment or the prior art description. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A flowchart of a transient loading method for a sequentially supercharged engine provided in an embodiment of the present application;

[0030] Figure 2 A flow chart of another transient loading method for a sequentially supercharged engine provided in an embodiment of the present application;

[0031] Figure 3 A schematic structural diagram of a transient loading device for a sequentially supercharged engine provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] Sequentially supercharged engines are used, for example, in marine diesel engines. During the loading process, sequentially supercharged engines often experience transient loading. However, during transient loading, the loading time can be prolonged due to factors such as supercharger switching, and the supercharger may even surge, potentially killing the engine.

[0033] Based on the above problems, the present application uses the rate of change of operating parameters of the sequentially supercharged engine due to transient loading caused by supercharger switching as a threshold value and\or uses the rate of change of operating parameters of the sequentially supercharged engine due to transient loading caused by throttle change as a threshold value. When the rate of change of operating parameters during the current operation of the sequentially supercharged engine exceeds the threshold value for transient loading, the intake and exhaust bypass valves of the sequentially supercharged engine are opened to improve the responsiveness of transient loading of the sequentially supercharged engine, make the supercharger switching smooth, avoid intake backflow during the loading process, increase the intake volume before the supercharger vortex, and ensure the smoothness and shortness of transient loading.

[0034] Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] Figure 1 This is a flow chart of a transient loading method for a sequential supercharging engine provided in an embodiment of the present application, see Figure 1 , a transient loading method for a sequentially supercharged engine, comprising:

[0036] S101. Acquire in real time the rate of change of operating parameters of a sequentially supercharged engine, where the sequentially supercharged engine includes a plurality of superchargers.

[0037] The operating parameter change rate is data that can reflect the engine's operating conditions. By real-time monitoring of the operating parameter change rate, transient loading of the sequential turbocharger can be promptly detected. In one possible implementation, the operating parameter change rate can be the engine speed change rate. In another possible implementation, the operating parameter change rate can be the circulating fuel supply rate. Of course, other change rates that can reflect user needs are also possible. Both the engine speed change rate and the circulating fuel supply rate can be detected by the engine's electronic control unit (ECU).

[0038] The sequential supercharging engine can be applied to, for example, a marine diesel engine. The sequential supercharging engine includes a plurality of superchargers. The number of superchargers in the sequential supercharging engine can be switched and increased according to the user's loading requirements.

[0039] The rate of change of the operating parameters of the sequential supercharging engine is obtained in real time so as to detect the operating status of the sequential supercharging engine at any time.

[0040] S102: If the rate of change of the operating parameter exceeds a preset threshold, it is determined that transient loading occurs in the sequentially supercharged engine, and then the intake and exhaust bypass valves of the sequentially supercharged engine are controlled to open.

[0041] The thresholds may include one or more of a supercharger threshold and a throttle opening threshold. The supercharger threshold is the rate of change of an operating parameter when the number of superchargers currently in operation increases under the current sequentially supercharged engine operating condition. The throttle opening threshold is the rate of change of an operating parameter in response to the current rate of change of the throttle opening under the current sequentially supercharged engine operating condition. The preset thresholds may be manually set based on experience or may be preset and calibrated through experimental testing.

[0042] According to the above steps S101-S102, the present application uses the rate of change of the operating parameters that can reflect the transient supercharging of the sequential supercharger engine as a threshold. When the rate of change of the operating parameters exceeds the threshold for transient loading, the intake and exhaust bypass valves of the sequential supercharger engine are opened, thereby improving the responsiveness of the sequential supercharger engine to transient loading, making the supercharger switch smoothly, avoiding the backflow of intake air during the loading process, increasing the air flow before the supercharger vortex, and ensuring the smoothness and shortness of transient loading.

[0043] In the embodiment of the present application, the above Figure 1 There are other possible implementations after step S102, which are described in detail below. It should be noted that the implementations described below are only for illustrative purposes and do not represent all implementations of the embodiments of the present application.

[0044] Another transient loading method for a sequentially supercharged engine provided in an embodiment of the present application, in addition to the above steps, further includes the following steps:

[0045] If the rate of change of the operating parameter is lower than the threshold, it is determined that the sequentially supercharged engine has entered a steady-state loading state, and the intake and exhaust bypass valves of the sequentially supercharged engine are controlled to be closed.

[0046] When it is detected that the rate of change of the operating parameter is lower than the threshold, the engine enters a steady state and the transient loading ends. The intake and exhaust bypass valves of the sequential supercharging engine can be controlled to close to reduce energy consumption.

[0047] In the embodiment of the present application, the above Figure 1The thresholds in steps S101-S102 are the supercharger thresholds and / or the throttle opening thresholds. Possible implementations are described below. It should be noted that the implementations described below are merely exemplary and do not represent all implementations of the embodiments of this application.

[0048] In a first possible implementation, the threshold is a supercharger threshold, which is a rate of change of an operating parameter when the number of superchargers currently in operation increases under the current sequential supercharging engine operating condition;

[0049] Before the operating parameter change rate exceeds a preset threshold, the method further includes:

[0050] Based on the current operating conditions of the sequentially supercharged engine and according to the number of superchargers currently in operation, a preset first correspondence is queried to determine the supercharger threshold; the first correspondence is a correspondence between the number of superchargers in operation and the rate of change of an operating parameter in each operating condition of the sequentially supercharged engine.

[0051] In the first possible implementation described above, the number of superchargers in operation in the sequentially supercharged engine increases, and the sequentially supercharged engine undergoes transient loading. Switching of a new supercharger may be unstable, thereby increasing the loading time. Therefore, timely control of the opening of the intake and exhaust bypass valves of the sequentially supercharged engine can effectively smooth the increase in supercharger switching, reduce the loading time, and improve the smoothness of transient loading and the engine loading efficiency.

[0052] In a second possible implementation, the threshold is a throttle opening threshold, which is a rate of change of an operating parameter in response to a current rate of change of the throttle opening under the current operating condition of the sequentially supercharged engine;

[0053] Before the operating parameter change rate exceeds a preset threshold, the method further includes:

[0054] Based on the current operating conditions of the sequentially supercharged engine, according to the current throttle opening change rate, a preset second corresponding relationship is queried to determine the throttle opening threshold; the second corresponding relationship is the corresponding relationship between the throttle opening change rate and the operating parameter change rate in each operating condition of the sequentially supercharged engine.

[0055] In the second possible implementation method mentioned above, the throttle change rate will also cause transient loading in the sequentially supercharged engine. Therefore, a second corresponding relationship is preset to determine that under the current operating conditions of the engine, the operating parameter change rate corresponding to the current throttle opening change rate is used as the throttle opening threshold, which is then used to determine that transient loading has occurred when the actual operating parameter change rate is detected to exceed the throttle opening threshold.

[0056] In a third possible implementation, the threshold value includes a supercharger threshold value and a throttle opening threshold value. The supercharger threshold value is a rate of change of an operating parameter when the number of superchargers currently in operation increases under the current sequentially supercharged engine operating condition. The throttle opening threshold value is a rate of change of an operating parameter in response to a current rate of change of the throttle opening under the current sequentially supercharged engine operating condition.

[0057] Before the operating parameter change rate exceeds a preset threshold, the method further includes:

[0058] Based on the current operating condition of the sequentially supercharged engine and the number of superchargers currently in operation, a preset first correspondence relationship is queried to determine the supercharger threshold; the first correspondence relationship being a correspondence between the number of superchargers in operation and the rate of change of an operating parameter in each operating condition of the sequentially supercharged engine;

[0059] And, based on the current operating conditions of the sequentially supercharged engine, according to the current throttle opening change rate, query the preset second corresponding relationship to determine the throttle opening threshold; the second corresponding relationship is the corresponding relationship between the throttle opening change rate and the operating parameter change rate in each operating condition of the sequentially supercharged engine.

[0060] In the third possible implementation manner described above, the throttle opening threshold and the supercharger threshold are combined to make the conditions for determining transient loading more comprehensive and accurate.

[0061] Regarding the first possible implementation method mentioned above, this application provides a detailed introduction in conjunction with specific embodiments, as follows. Figure 2 A flow chart of another transient loading method for a sequentially supercharged engine provided in an embodiment of the present application is shown in FIG. Figure 2 Another transient loading method for a sequentially supercharged engine provided in an embodiment of the present application includes the following steps:

[0062] S201. Acquire in real time the rate of change of operating parameters of a sequentially supercharged engine, where the sequentially supercharged engine includes a plurality of superchargers.

[0063] When the user performs transient loading, the sequential supercharging engine will increase the supercharger to ensure the completion of loading. However, when the additional supercharger is cut in, the loading time will be too long. Therefore, the operating parameters of the sequential supercharging engine are obtained in real time to understand the operating status of the sequential supercharging engine.

[0064] S202. Based on the current operating condition of the sequentially supercharged engine and the number of superchargers currently in operation, a preset first correspondence is queried to determine the supercharger threshold; the first correspondence is a correspondence between the number of superchargers in operation and the rate of change of an operating parameter in each operating condition of the sequentially supercharged engine.

[0065] The supercharger threshold value may be a rate of change of an operating parameter at a transient loading moment when the number of superchargers in operation increases by one under the current operating condition of the sequentially supercharged engine.

[0066] Based on the first correspondence, under the current operating conditions of the sequentially supercharged engine, the corresponding operating parameter change rate is determined based on the number of superchargers currently in operation. The opening of the intake and exhaust bypass valves can be set based on the engine speed and circulating fuel flow rate, thereby precisely achieving the opening range and operating conditions of the intake and exhaust bypass valves.

[0067] S203. If the rate of change of the operating parameter exceeds the supercharger threshold, it is determined that the number of superchargers in operation in the sequentially supercharged engine has increased, and the intake and exhaust bypass valves of the sequentially supercharged engine are controlled to open; if the rate of change of the operating parameter does not exceed the supercharger threshold, the intake and exhaust bypass valves of the sequentially supercharged engine remain closed.

[0068] As the number of superchargers in operation in a sequentially supercharged engine increases, the sequentially supercharged engine undergoes transient loading. Switching of a new supercharger may be unstable, increasing the loading time. Therefore, timely control of the opening of the intake and exhaust bypass valves of the sequentially supercharged engine can effectively smooth the switching of the superchargers, reduce the loading time, and improve the stability of transient loading and the engine loading efficiency.

[0069] S204. If the operating parameter change rate is lower than the supercharger threshold, the intake and exhaust bypass valves of the sequentially supercharged engine are controlled to be closed; if the operating parameter change rate is not lower than the supercharger threshold, the intake and exhaust bypass valves of the sequentially supercharged engine remain open.

[0070] During transient loading, while the intake and exhaust bypass valves are open, the ECU continuously monitors the engine speed change rate or the circulating fuel supply rate change rate. If these rates do not meet set values, the intake and exhaust bypass valves are closed. If the sequentially supercharged engine switches to a new supercharger and the rate of change of operating parameters exceeds a threshold, the engine remains in transient loading. Once the rate of change of operating parameters falls below the threshold, the engine enters steady state. At this point, the intake and exhaust bypass valves are closed, saving fuel.

[0071] According to the above steps S201-S204, the present application enables the user to solve the above problem by opening the intake and exhaust bypass valves during the switching process to reduce the impact of successive supercharger switching on the engine when transiently loading from a low operating condition to a high operating condition, avoid increased supercharger switching during the loading process, and avoid switching failure caused by excessive supercharger loading time. This can ensure smooth switching of the supercharger, increase the energy of the supercharger turbine end, avoid intake air backflow, greatly shorten the transient loading time, ensure that the engine meets the transient loading index, and meet the customer's needs for rapid acceleration loading.

[0072] The above are some specific implementation methods for transient loading of a sequential supercharging engine provided by the embodiment of the present application. Based on this, the present application also provides a corresponding device. The device provided by the embodiment of the present application will be introduced from the perspective of functional modularization.

[0073] See also Figure 3 The structure diagram of a transient loading device of a sequentially supercharged engine is shown in FIG. A transient loading device 300 of a sequentially supercharged engine includes:

[0074] The acquisition module 301 is used to acquire the change rate of the operating parameters of the sequential supercharging engine in real time.

[0075] The operating parameter change rate may be an engine speed change rate or a cyclic fuel supply change rate.

[0076] The first control module 302 is configured to control the intake and exhaust bypass valves of the sequentially supercharged engine to open if the rate of change of the operating parameter exceeds a preset threshold and it is determined that transient loading occurs in the sequentially supercharged engine.

[0077] According to the above-mentioned transient loading device for a sequentially supercharged engine, the acquisition module 301 acquires the rate of change of the operating parameter reflecting the transient supercharging of the sequentially supercharged engine. When the rate of change of the operating parameter exceeds the threshold for the occurrence of transient loading, the first control module 302 opens the intake and exhaust bypass valves of the sequentially supercharged engine, thereby improving the responsiveness of the sequentially supercharged engine to transient loading, making the supercharger switching smoother, and shortening the loading time.

[0078] In one possible implementation, the device further includes: a second control module configured to control the intake and exhaust bypass valves of the sequentially supercharged engine to close if the rate of change of the operating parameter is lower than the threshold, determining that the sequentially supercharged engine has entered a steady-state loading state.

[0079] In another possible implementation, the threshold is a supercharger threshold, which is the rate of change of the operating parameter when the number of superchargers currently in operation increases under the current sequential supercharging engine operating condition;

[0080] A determination module is configured to query a preset first correspondence relationship based on the current operating condition of the sequentially supercharged engine and the number of superchargers currently in operation to determine the supercharger threshold; the first correspondence relationship being a correspondence between the number of superchargers in operation and the rate of change of an operating parameter in each operating condition of the sequentially supercharged engine.

[0081] In another possible implementation, the threshold is a throttle opening threshold, which is a rate of change of an operating parameter in response to a current rate of change of the throttle opening under the current sequentially supercharged engine operating condition;

[0082] A determination module is used to query a preset second corresponding relationship based on the current operating condition of the sequentially supercharged engine and the current throttle opening change rate to determine the throttle opening threshold; the second corresponding relationship is the corresponding relationship between the throttle opening change rate and the operating parameter change rate in each operating condition of the sequentially supercharged engine.

[0083] In another possible implementation, the threshold value includes a supercharger threshold value and a throttle opening threshold value. The supercharger threshold value is the rate of change of the operating parameter when the number of superchargers currently in operation increases under the current sequentially supercharged engine operating condition. The throttle opening threshold value is the rate of change of the operating parameter in response to the current throttle opening change rate under the current sequentially supercharged engine operating condition.

[0084] A determination module is configured to determine the supercharger threshold by querying a preset first correspondence relationship based on the current operating condition of the sequentially supercharged engine and the number of superchargers currently in operation; the first correspondence relationship being a correspondence between the number of superchargers in operation and the rate of change of an operating parameter in each operating condition of the sequentially supercharged engine; and, based on the current operating condition of the sequentially supercharged engine and the current rate of change of a throttle opening, by querying a preset second correspondence relationship to determine the throttle opening threshold; the second correspondence relationship being a correspondence between the rate of change of the throttle opening and the rate of change of the operating parameter in each operating condition of the sequentially supercharged engine.

[0085] The embodiments of the present application also provide corresponding sequential supercharging engines, devices, and computer storage media for implementing the solutions provided in the embodiments of the present application.

[0086] Among them, a sequential supercharging engine is provided, which adopts the above-mentioned transient loading method of the sequential supercharging engine.

[0087] The device includes a memory and a processor, the memory is used to store instructions or codes, and the processor is used to execute the instructions or codes so that the device performs a transient loading method for a sequentially supercharged engine as described in any embodiment of the present application.

[0088] The computer storage medium stores codes. When the codes are executed, the device executing the codes implements a transient loading method for a sequentially supercharged engine as described in any embodiment of the present application.

[0089] The "first" and "second" (if any) in the names mentioned in the embodiments of this application are only used as name identifiers and do not mean the first or second in order.

[0090] Through the description of the above embodiments, it can be known that those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by means of software plus a general hardware platform. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a storage medium, such as a read-only memory (ROM) / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network communication device such as a router) to execute the methods described in each embodiment or certain parts of the embodiments of the present application.

[0091] Each embodiment in this specification is described in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple. For the relevant parts, refer to the partial description of the method embodiment. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment. Those of ordinary skill in the art can understand and implement it without paying any creative work.

[0092] The above description is merely an exemplary embodiment of the present application and is not intended to limit the scope of protection of the present application.

Claims

1. A transient loading method for a sequentially supercharged engine, characterized in that: The method comprises: Real-time acquisition of the rate of change of operating parameters of the sequentially supercharged engine; If the rate of change of the operating parameter exceeds a preset threshold, it is determined that transient loading occurs in the sequentially supercharged engine, and then the intake and exhaust bypass valves of the sequentially supercharged engine are controlled to open; The thresholds include a supercharger threshold and a throttle opening threshold. The supercharger threshold is the rate of change of the operating parameter when the number of superchargers currently in operation increases under the current sequential supercharging engine operating condition. The throttle opening threshold is the rate of change of the operating parameter in response to the current throttle opening change rate under the current sequential supercharging engine operating condition. Before the operating parameter change rate exceeds a preset threshold, the method further includes: Based on the current operating condition of the sequentially supercharged engine, and according to the number of superchargers currently in operation, a preset first correspondence relationship is queried to determine the supercharger threshold; the first correspondence relationship being a correspondence between the number of superchargers in operation and a rate of change of an operating parameter in each operating condition of the sequentially supercharged engine; and, based on the current operating condition of the sequentially supercharged engine, and according to the current rate of change of the throttle opening, a preset second correspondence relationship is queried to determine the throttle opening threshold; the second correspondence relationship being a correspondence between the rate of change of the throttle opening and a rate of change of the operating parameter in each operating condition of the sequentially supercharged engine; The operating parameter change rate is the engine speed change rate or the cyclic fuel supply change rate.

2. The method according to claim 1, characterized in that After controlling the intake and exhaust bypass valves of the sequentially supercharged engine to open, the method further includes: If the rate of change of the operating parameter is lower than the threshold, it is determined that the sequentially supercharged engine has entered a steady-state loading state, and the intake and exhaust bypass valves of the sequentially supercharged engine are controlled to be closed.

3. A transient loading device for a sequentially supercharged engine, characterized in that: The device comprises: an acquisition module, configured to acquire in real time a rate of change of an operating parameter of a sequentially supercharged engine, wherein the sequentially supercharged engine includes a plurality of superchargers; a first control module, configured to control an intake and exhaust bypass valve of the sequentially supercharged engine to open if a rate of change of the operating parameter exceeds a preset threshold value and the sequentially supercharged engine is determined to be transiently loaded; The thresholds include a supercharger threshold and a throttle opening threshold. The supercharger threshold is the rate of change of the operating parameter when the number of superchargers currently in operation increases under the current sequential supercharging engine operating condition. The throttle opening threshold is the rate of change of the operating parameter in response to the current throttle opening change rate under the current sequential supercharging engine operating condition. The first control module is further specifically configured to: determine the supercharger threshold value by querying a preset first correspondence relationship based on the current operating condition of the sequentially supercharged engine and the number of superchargers currently in operation, before the rate of change of the operating parameter exceeds a preset threshold value; the first correspondence relationship is a correspondence between the number of superchargers in operation and the rate of change of the operating parameter in each operating condition of the sequentially supercharged engine; and, based on the current operating condition of the sequentially supercharged engine and the current rate of change of the throttle opening, determine the throttle opening threshold value by querying a preset second correspondence relationship; the second correspondence relationship is a correspondence between the rate of change of the throttle opening and the rate of change of the operating parameter in each operating condition of the sequentially supercharged engine.

4. The device according to claim 3, characterized in that The device further comprises: a second control module, configured to control an intake and exhaust bypass valve of the sequentially supercharged engine to close if the rate of change of the operating parameter is lower than the threshold, determining that the sequentially supercharged engine has entered a steady-state loading state; The operating parameter change rate is the engine speed change rate or the cyclic fuel supply change rate.

5. A sequential supercharging engine, characterized in that: The sequential supercharging engine adopts the transient loading method of the sequential supercharging engine according to any one of claims 1-2.

Images