Control method and device of sequential turbocharging system, storage medium and electronic equipment

Abstract

The application provides a control method and device of a sequential supercharging system, a storage medium and an electronic device, and the method comprises the following steps: acquiring a compressor inlet pressure of a controlled supercharger, wherein the compressor inlet pressure is the gas pressure upstream of the compressor of the controlled supercharger; in the case that the compressor inlet pressure jumps between a positive value and a negative value within a first preset time length, determining that the current running state of the controlled supercharger is an unstable state, wherein the unstable state is a state in which the controlled supercharger is switched between opening and closing; in the case that the current running state of the controlled supercharger is the unstable state, forcibly opening the controlled supercharger. The method judges whether the sequential supercharger is in an abnormal state of switching back and forth by monitoring the compressor inlet pressure of the engine, and in the case that the sequential supercharger is in the abnormal state of switching back and forth, the stable running of the supercharger is ensured by forcibly opening or closing the next controlled supercharger, and then the reliability of the engine is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine control, in particular, to a control method of a sequential supercharging system, a control device of a sequential supercharging system, a computer readable storage medium and an electronic device. BACKGROUND

[0002] The sequential supercharging system in the prior art engine is controlled to open based on the rotation speed and the circulating oil amount. When the circulating oil amount is at the critical point of opening and closing of the supercharger intake and exhaust control valve in the sequential supercharging system, slight fluctuation of the circulating oil amount will cause the supercharger intake and exhaust control valve to open and close back and forth, and then cause the supercharger to switch back and forth between the open state and the closed state, affecting the operation and reliability of the engine. SUMMARY

[0003] The main purpose of the present application is to provide a control method of a sequential supercharging system, a control device of a sequential supercharging system, a computer readable storage medium and an electronic device, to at least solve the problem that the fluctuation of the circulating oil amount in the prior art causes the unstable switching state of the sequential supercharger, resulting in low operation reliability of the engine.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a control method of a sequential supercharging system is provided, the sequential supercharging system comprising at least one controlled supercharger, the sequential supercharging system being located in an engine, the method comprising: obtaining a compressor inlet pressure of the controlled supercharger, the compressor inlet pressure being a gas pressure upstream of a compressor of the controlled supercharger; in the case that the compressor inlet pressure jumps between a positive value and a negative value within a first preset time length, determining that a current operating state of the controlled supercharger is an unstable state, wherein the unstable state is a state in which the controlled supercharger switches between opening and closing; in the case that the current operating state of the controlled supercharger is the unstable state, forcibly opening the controlled supercharger.

[0005] Optionally, before obtaining the compressor inlet pressure of the controlled supercharger, the method further comprises: obtaining an operating parameter of the engine, the operating parameter at least comprising a rotation speed of the engine and a torque of the engine; in the case that the rotation speed and the torque of the engine are both within a preset parameter range within a second preset time length, determining that the operating state of the engine is a steady state operation; in the case that the operating state of the engine is the steady state operation, determining to obtain the compressor inlet pressure of the controlled supercharger.

[0006] Optionally, the sequential supercharging system comprises a plurality of controlled superchargers, and in a case where the pressure at the compressor inlet jumps between a positive value and a negative value within a first preset time length, the current operating state of the controlled superchargers is determined to be the unstable state, comprising: in a case where the pressure at the compressor inlet jumps between a positive value and a negative value within a first preset time length, the current operating state of a target supercharger corresponding to the pressure at the compressor inlet is determined to be the unstable state, wherein the target supercharger is one of the plurality of controlled superchargers, and the target supercharger is only one.

[0007] Optionally, the sequential supercharging system comprises a base supercharger and a controlled supercharger, and in a case where the current operating state of the controlled supercharger is the unstable state, after the controlled supercharger is forcibly started, the method further comprises: obtaining a first turbine upstream exhaust temperature and a second turbine upstream exhaust temperature, the first turbine upstream exhaust temperature being the exhaust temperature upstream of the turbine of the base supercharger, and the second turbine upstream exhaust temperature being the exhaust temperature upstream of the turbine of the controlled supercharger; in a case where both the first turbine upstream exhaust temperature and the second turbine upstream exhaust temperature are less than or equal to a first temperature threshold, the operating state of the engine at the current time is determined to be the stable state; and in a case where at least one of the first turbine upstream exhaust temperature and the second turbine upstream exhaust temperature is greater than the first temperature threshold, the controlled supercharger is forcibly stopped.

[0008] Optionally, in a case where at least one of the first turbine upstream exhaust temperature and the second turbine upstream exhaust temperature is greater than the temperature threshold, after the controlled supercharger is forcibly stopped, the method further comprises: obtaining a first supercharger speed and a second supercharger speed, the first supercharger speed being the speed of the base supercharger, and the second supercharger speed being the speed of the controlled supercharger; in a case where both the first supercharger speed and the second supercharger speed are less than or equal to a first speed threshold, the operating state of the engine at the current time is determined to be the stable state; and in a case where at least one of the first supercharger speed and the second supercharger speed is greater than the first speed threshold, the engine is controlled to reduce the operating load to a first target load.

[0009] Optionally, the method further comprises: obtaining a plurality of third turbine outlet temperatures and fourth turbine outlet temperatures, the third turbine outlet temperature being an exhaust temperature upstream of a turbine of a non-targeted supercharger, the fourth turbine outlet temperature being an exhaust temperature upstream of a turbine of a targeted supercharger, the targeted supercharger being the controlled supercharger whose current operating state is the unstable state, the non-targeted supercharger being one of the controlled superchargers other than the targeted supercharger and the base supercharger; determining that the operating state of the engine at the current time is the stable state in a case where all of the third turbine outlet temperatures and the fourth turbine outlet temperatures are less than or equal to a second temperature threshold; and forcibly closing the controlled supercharger in a case where at least one of the third turbine outlet temperatures and the fourth turbine outlet temperatures is greater than the second temperature threshold.

[0010] Optionally, the method further comprises: obtaining a plurality of third supercharger speeds and fourth supercharger speeds, the third supercharger speed being a speed of the non-targeted supercharger, the fourth supercharger speed being a speed of the targeted supercharger; determining that the operating state of the engine at the current time is the stable state in a case where all of the third supercharger speeds and the fourth supercharger speeds are less than or equal to a second speed threshold; and controlling the engine to reduce an operating load to a second target load in a case where at least one of the third supercharger speeds and the fourth supercharger speeds is greater than the second speed threshold.

[0011] According to another aspect of the present application, there is provided a control device of a sequential supercharging system, the sequential supercharging system comprising at least one controlled supercharger, the sequential supercharging system being located in an engine, the device comprising: an obtaining unit configured to obtain a compressor inlet pressure of the controlled supercharger, the compressor inlet pressure being a gas pressure upstream of a compressor of the controlled supercharger; a determining unit configured to determine that a current operating state of the controlled supercharger is an unstable state in a case where the compressor inlet pressure jumps between a positive value and a negative value within a first preset time length, wherein the unstable state represents a state in which the controlled supercharger is switched between being turned on and being turned off; and a turning-on unit configured to forcibly turn on the controlled supercharger in a case where the current operating state of the controlled supercharger is the unstable state.

[0012] According to another aspect of the present application, there is provided a computer-readable storage medium including a stored program, wherein the computer-readable storage medium is caused to perform any one of the control methods of the sequential supercharging system when the program is run.

[0013] According to another aspect of the present application, there is provided an electronic device including one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include any one of the control methods of the sequential supercharging system.

[0014] According to the technical solution of the present application, the sequential supercharging system includes at least one controlled supercharger, and the sequential supercharging system is located in an engine. The control method of the sequential supercharging system first acquires a compressor inlet pressure of the controlled supercharger, the compressor inlet pressure being a gas pressure upstream of a compressor of the controlled supercharger. Then, in a case where the compressor inlet pressure jumps between a positive value and a negative value within a first preset time length, it is determined that a current operating state of the controlled supercharger is an unstable state, wherein the unstable state is a state in which the controlled supercharger switches between opening and closing. Finally, in a case where the current operating state of the controlled supercharger is the unstable state, the controlled supercharger is forcibly opened. The method monitors the compressor inlet pressure of the engine to determine whether the sequential supercharger is in an abnormal state of switching back and forth. In a case where the sequential supercharger is in the abnormal state of switching back and forth, the stable operation of the supercharger is ensured by forcibly opening or closing the next controlled supercharger or by reducing the load of the engine, thereby ensuring the reliability of the engine and solving the problem that the fluctuation of the circulating oil volume in the prior art causes the unstable switching state of the sequential supercharger, resulting in low reliability of the engine. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of the present description, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the present application, and their

[0016] Figure 1 Fig. 1 shows a flowchart of a control method of a sequential supercharging system according to an embodiment of the present application;

[0017] Figure 2 Fig. 1 shows a flowchart of a control method of a sequential supercharging system according to an embodiment of the present application;

[0018] Figure 3 Fig. 1 shows a flowchart of a control method of a sequential supercharging system according to an embodiment of the present application;

[0019] Figure 4 A flowchart of another control method of a sequential supercharging system according to an embodiment of the present application is shown;

[0020] Figure 5 A structural block diagram of a control device of a sequential supercharging system according to an embodiment of the present application is shown;

[0021] Figure 6 A structural block diagram of another control device of a sequential supercharging system according to an embodiment of the present application is shown.

[0022] Among the above drawings, the following reference signs are included:

[0023] 01, first exhaust pipe; 02, second exhaust pipe; 03, first cylinder head; 04, second cylinder head; 05, first intake pipe; 06, second intake pipe; 07, intercooler; 08, base turbine; 09, base compressor; 10, first turbine; 11, second turbine; 12, first compressor; 13, second compressor; 14, first intake control valve; 15, second intake control valve; 16, first exhaust control valve; 17, second exhaust control valve; 18, first air cleaner; 19, second air cleaner; 20, exhaust tailpipe. DETAILED DESCRIPTION

[0024] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should belong to the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] For the convenience of description, the following describes some nouns or terms related to the embodiments of the present application:

[0028] Sequential turbocharging: refers to a turbocharging system composed of two or more than two turbochargers in parallel, which can control the sequential intervention of the turbocharger according to the operating condition of the engine.

[0029] Intake and exhaust control valve: refers to a control valve added at the exhaust end and the intake end of the controlled turbocharger in order to control the intervention and cut-off of the controlled turbocharger in the sequential turbocharging system, which can control the on-off of the exhaust and intake paths of the controlled turbocharger.

[0030] As introduced in the background, the sequential turbocharging system in the prior art engine is controlled to open based on the rotation speed and the circulating oil quantity. When the circulating oil quantity is at the critical point of the opening and closing of the turbocharger intake and exhaust control valve in the sequential turbocharging system, slight fluctuation of the circulating oil quantity will cause the turbocharger intake and exhaust control valve to open and close back and forth, and then cause the turbocharger to switch back and forth between the open state and the closed state, affecting the operation and reliability of the engine. To solve the problem that the fluctuation of the circulating oil quantity in the prior art will cause the unstable switching state of the sequential turbocharger, resulting in low operation reliability of the engine, the embodiments of the present application provide a control method of a sequential turbocharging system, a control device of a sequential turbocharging system, a computer readable storage medium and an electronic device.

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application.

[0032] In the present embodiment, a control method of a sequential turbocharging system running on a mobile terminal, a computer terminal or the like is provided. It should be noted that the steps shown in the flowchart of the drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0033] Figure 1 is a flowchart of the control method of the sequential turbocharging system according to the embodiments of the present application. As shown in Figure 1 The sequential turbocharging system includes at least one controlled turbocharger, and the above-mentioned sequential turbocharging system is located in an engine. The method includes the following steps:

[0034] Step S101, obtaining the compressor inlet pressure of the controlled turbocharger, the compressor inlet pressure being the gas pressure upstream of the compressor of the controlled turbocharger;

[0035] Specifically, the supercharging system is to improve the engine performance by increasing the engine intake pressure. The sequential supercharging system is a special supercharging system that uses two or more superchargers to increase the engine intake pressure, and a supercharger is generally composed of a turbine and a compressor. By installing a multi-stage turbocharger or a turbocharger combined with a mechanical supercharger in the intake passage, the engine can obtain higher intake pressure in different speed ranges, thereby improving combustion efficiency and output power. The sequential supercharging system can achieve greater power output without compromising engine reliability.

[0036] The sequential supercharging system can increase the engine compression efficiency by increasing the intake pressure, thereby increasing the gas density and temperature in the combustion chamber, improving the combustion efficiency, and thus improving the engine power and torque output. The sequential supercharging system can also provide additional gas pressure when the engine is running, so that the engine can use fuel more efficiently and improve fuel economy. The sequential supercharging system can also improve the response speed of the engine and reduce turbo lag. In high-altitude areas, the air is thin, and the performance of the engine will decrease. The sequential supercharging system can compensate for the performance loss caused by the thin air by increasing the intake pressure, thereby improving the performance of the engine in high-altitude areas.

[0037] wherein, as shown in Figure 2 Before obtaining the compressor inlet pressure of the controlled supercharger, the method further comprises the following steps:

[0038] Step S201, obtaining the operating parameters of the engine, wherein the operating parameters at least include the speed of the engine and the torque of the engine;

[0039] Step S202, determining that the operating state of the engine is a steady state operation if the speed and the torque of the engine are within the preset parameter range within a second preset time period;

[0040] Step S203, determining to obtain the compressor inlet pressure of the controlled supercharger if the operating state of the engine is the steady state operation.

[0041] Specifically, the state judgment of the supercharger under the stable working condition of the engine can make the judgment result more accurate and avoid judgment errors caused by unstable working condition of the engine.

[0042] In some embodiments, the second preset time period can be 5 minutes, the preset range of the engine speed can be 1000±5 revolutions / minute, and the preset range of the engine torque can be 1000±20N, i.e. if the engine speed is maintained at 1000±5 revolutions / minute and the torque is maintained at 1000±20N within 5 minutes, it is determined that the engine is in a steady state operation.

[0043] Step S102, in the case that the compressor inlet pressure jumps between positive and negative values within the first preset time length, determining that the current operating state of the controlled supercharger is an unstable state, wherein the unstable state is a state in which the controlled supercharger is switched between opening and closing.

[0044] Specifically, since the sequential supercharging system in the engine is controlled to be opened based on the rotation speed and the circulating oil amount, when the circulating oil amount is at a critical point at which the supercharger inlet and exhaust control valve of the sequential supercharging system is opened and closed, slight fluctuation of the circulating oil amount will cause the supercharger inlet and exhaust control valve to be opened and closed repeatedly, and further cause the supercharger to be switched between the open state and the closed state repeatedly, thereby affecting the operation and reliability of the engine. Therefore, it is necessary to stably control the opening and closing state of the supercharger, so as to stably operate the sequential supercharger, and further stably operate the engine, thereby ensuring the reliability of the engine.

[0045] Specifically, the method further comprises the following steps:

[0046] Specifically, in this way, the controlled supercharger with unstable opening and closing state can be accurately determined, so as to accurately control the supercharger.

[0047] Step S103, in the case that the current operating state of the controlled supercharger is the unstable state, forcibly opening the controlled supercharger.

[0048] Specifically, when the engine is in stable operation, the compressor inlet pressure of the engine is monitored in real time, and if the compressor inlet pressure repeatedly changes between positive and negative values, the controlled supercharger corresponding to the compressor is forcibly opened, which can effectively prevent the sequential supercharger from being switched repeatedly, so as to stably operate the sequential supercharger, and further stably operate the engine, thereby ensuring the reliability of the engine.

[0049] Specifically, the method further comprises the following steps:

[0050] Step S301, obtaining a first turbine inlet temperature and a second turbine inlet temperature, the first turbine inlet temperature being an exhaust temperature upstream of a turbine of the basic supercharger, and the second turbine inlet temperature being an exhaust temperature upstream of a turbine of the controlled supercharger;

[0051] Step S302, in a case where both the first turbine inlet temperature and the second turbine inlet temperature are less than or equal to a first temperature threshold, determining that a current state of the engine is a stable state;

[0052] Step S303, in a case where at least one of the first turbine inlet temperature and the second turbine inlet temperature is greater than the first temperature threshold, forcibly closing the controlled supercharger.

[0053] Generally, the basic supercharger is always open, and only the controlled supercharger is controlled to be open or closed, that is, the basic supercharger is always in an open state, and in a case where the engine load increases, a controlled supercharger is opened according to actual conditions, which is a first-stage supercharger, and in a case where the engine load continues to increase, a second controlled supercharger is opened, and so on.

[0054] Therefore, in a case where a controlled supercharger is opened, the basic supercharger is also actually in a running state at this time, and the turbine inlet temperature of the basic supercharger and the turbine inlet temperature of the opened controlled supercharger need to be judged at the same time.

[0055] Specifically, according to the turbine inlet temperature, it can be determined whether the engine can be stably operated in the current state, and if the turbine inlet temperature of the engine at this time meets the design requirement, the engine can be stably operated in this state, and if the turbine inlet temperature is out of limit, the controlled supercharger is closed.

[0056] The first temperature threshold can be 700°C.

[0057] In a case where at least one of the first turbine inlet temperature and the second turbine inlet temperature is greater than the temperature threshold, after the controlled supercharger is forcibly closed, the method further includes the following steps:

[0058] Step S304, obtaining a first supercharger speed and a second supercharger speed, the first supercharger speed being a speed of the basic supercharger, and the second supercharger speed being a speed of the controlled supercharger;

[0059] Step S305, in a case where both the first supercharger speed and the second supercharger speed are less than or equal to a first speed threshold, determining that a current state of the engine is a stable state;

[0060] Step S306, in the case that at least one of the first supercharger speed and the second supercharger speed is greater than the first speed threshold, the engine is controlled to reduce the operating load to the first target load.

[0061] Specifically, according to the supercharger speed, it can be determined whether the engine can be stably operated in the current state. If the supercharger speed is not over the limit, it proves that the engine can be stably operated, and if the supercharger speed is over the limit, the engine is reduced in load.

[0062] In the case that a controlled supercharger is started, the basic supercharger is also actually in an operating state at this time, and the speed of the basic supercharger and the speed of the started controlled supercharger need to be judged at the same time.

[0063] The first speed threshold can be set to 80000 rpm.

[0064] The sequential supercharging system includes a basic supercharger and a plurality of controlled superchargers. In the case that the current operating state of the controlled supercharger is the unstable state, after the controlled supercharger is forced to be started, the method further includes the following steps:

[0065] Step S401, a plurality of third turbine inlet exhaust temperatures and fourth turbine inlet exhaust temperatures are obtained. The third turbine inlet exhaust temperature is the exhaust temperature upstream of the turbine of a non-target supercharger, and the fourth turbine inlet exhaust temperature is the exhaust temperature upstream of the turbine of a target supercharger. The target supercharger is the controlled supercharger whose current operating state is the unstable state, and the non-target supercharger is one of all the controlled superchargers and the basic supercharger except the target supercharger.

[0066] Step S402, in the case that all the third turbine inlet exhaust temperatures and the fourth turbine inlet exhaust temperatures are less than or equal to a second temperature threshold, it is determined that the operating state of the engine at the current time is a stable state.

[0067] Step S403, in the case that at least one of all the third turbine inlet exhaust temperatures and the fourth turbine inlet exhaust temperatures is greater than the second temperature threshold, the controlled supercharger is forced to be closed.

[0068] From the above content, it can be known that the basic supercharger is always open, and only the controlled superchargers can be controlled to be started or closed, that is, the basic supercharger is always in an open state, and each controlled supercharger is a primary supercharger, a secondary supercharger, and so on. According to the size of the engine load, each level of supercharger is started in turn.

[0069] Therefore, in the case of opening the second controlled supercharger, the basic supercharger and the first controlled supercharger are actually in the running state at this time, and the pre-turbine exhaust temperature of the basic supercharger, the pre-turbine exhaust temperature of the opened first controlled supercharger and the pre-turbine exhaust temperature of the opened second controlled supercharger need to be judged at the same time. Since the controlled supercharger with a higher stage than the second supercharger is in the closed state, the pre-turbine exhaust temperature will not exceed the limit, so the judgment result is the same.

[0070] Specifically, according to the pre-turbine exhaust temperature, it can be determined whether the engine can stably run in the current state. If the pre-turbine exhaust temperature of the engine at this time meets the design requirements, the engine can stably run in this state. If the pre-turbine exhaust temperature exceeds the limit, the controlled supercharger is closed.

[0071] The second temperature threshold can be 700℃.

[0072] In the case where all of the above third pre-turbine exhaust temperature and the above fourth pre-turbine exhaust temperature are greater than the above temperature threshold, after the above controlled supercharger is forced to be closed, the method further comprises the following steps:

[0073] Step S404, obtaining a plurality of third supercharger speeds and fourth supercharger speeds, the third supercharger speed being the speed of the non-target supercharger, and the fourth supercharger speed being the speed of the target supercharger;

[0074] Step S405, in the case where all of the above third supercharger speed and the above fourth supercharger speed are less than or equal to a second speed threshold, determining that the running state of the engine at the current time is a stable state;

[0075] Step S406, in the case where at least one of the above third supercharger speed and the above fourth supercharger speed is greater than the above second speed threshold, controlling the engine to reduce the running load to a second target load.

[0076] Specifically, according to the supercharger speed, it can be determined whether the engine can stably run in the current state. If the supercharger speed does not exceed the limit, it proves that the engine can stably run, and if the supercharger speed exceeds the limit, the engine runs at a reduced load.

[0077] In the case of opening the second controlled supercharger, the basic supercharger and the first controlled supercharger are actually in the running state at this time, and the speed of the basic supercharger, the speed of the opened first controlled supercharger and the speed of the opened second controlled supercharger need to be judged at the same time. Since the controlled supercharger with a higher stage than the second supercharger is in the closed state, the speed will not exceed the limit, so the judgment result is the same.

[0078] The second speed threshold can be set to 80000 rpm.

[0079] The control method of the above-mentioned sequential supercharging system of the present application first obtains the compressor inlet pressure of the controlled supercharger, where the compressor inlet pressure is the gas pressure upstream of the compressor of the controlled supercharger; then, when the compressor inlet pressure jumps between positive and negative values ​​within a first preset time period, determines that the current operating state of the controlled supercharger is an unstable state, wherein the unstable state is the state in which the controlled supercharger switches between on and off; finally, when the current operating state of the controlled supercharger is an unstable state, forcibly turns on the controlled supercharger. The method determines whether the sequential supercharger is in an abnormal state of switching back and forth by monitoring the compressor inlet pressure of the engine. In the case of the abnormal state of switching back and forth of the sequential supercharger, the method ensures the stable operation of the supercharger by forcibly turning on or off the next controlled supercharger or reducing the load of the engine, thereby ensuring the reliability of the engine, and solving the problem in the prior art that the fluctuation of the circulating oil amount will cause the unstable switching state of the sequential supercharger, resulting in low operating reliability of the engine.

[0080] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the control method of the sequential boosting system of the present application will be described in detail below with reference to specific embodiments.

[0081] Figure 3 A schematic diagram of a sequential three-boost system is shown in Figure 1. Figure 3 As shown, the sequential three-supercharging system includes a basic supercharger and two controlled superchargers, namely the first controlled supercharger and the second controlled supercharger. The sequential three-supercharging system includes a first exhaust pipe 01, a second exhaust pipe 02, a first cylinder head 03, a second cylinder head 04, a first intake pipe 05, a second intake pipe 06, an intercooler 07, a basic turbine 08, a basic compressor 09, a first turbine 10, a second turbine 11, a first compressor 12, a second compressor 13, a first intake control valve 14, a second intake control valve 15, a first exhaust control valve 16, a second exhaust control valve 17, a first air filter 18, a second air filter 19, and an exhaust tail pipe 20. Among them, the basic turbine 08 and the basic compressor 09 constitute the basic supercharger, the first turbine 10 and the first compressor 12 constitute the first controlled supercharger, and the second turbine 11 and the second compressor 13 constitute the second controlled supercharger. The turbocharger activation sequence is as follows: the base turbocharger is always on, the first controlled turbocharger is activated when certain conditions are met, and the second controlled turbocharger is activated only after the first controlled turbocharger is activated and the second controlled turbocharger activation conditions are met. The arrows indicate the direction of exhaust flow. Specifically, when the engine is under light load, only the base turbocharger is activated; when the engine is under medium load, the base turbocharger and the first controlled turbocharger are activated; and when the engine is under heavy load, the base turbocharger, the first controlled turbocharger, and the second controlled turbocharger are activated.

[0082] Based on the sequential three supercharging system of Figure 3 the embodiment, a specific control method of the sequential supercharging system is provided, as shown in Figure 4 During the engine operation, first, the engine is judged to be in steady state operation through the rotation speed and torque, and when the engine is in steady state operation, the pressure inlet of the first controlled supercharger and the second controlled supercharger is judged to be changed between positive and negative values. Since the controlled superchargers are sequentially opened one by one, only one of the compressors of the first controlled supercharger and the second controlled supercharger will be changed between positive and negative values. For example, in the case that the compressor of the first controlled supercharger is changed between positive and negative values, it can be judged that the first controlled supercharger is switched between opening and closing, and at this time, the first controlled supercharger needs to be forcibly opened. Then, the pre-turbine exhaust temperature of the base supercharger and the first controlled supercharger is judged, and when the pre-turbine exhaust temperature of the base supercharger and the first controlled supercharger is not over the limit value, the engine can be stably operated in this state, and when one of the pre-turbine exhaust temperatures of the base supercharger and the first controlled supercharger is over the limit value, the first controlled supercharger is forcibly closed. Finally, the rotation speed of the base supercharger and the first controlled supercharger is judged, and when the rotation speed of the base supercharger and the first controlled supercharger is not over the limit value, the engine can be stably operated in this state, and when one of the rotation speeds of the base supercharger and the first controlled supercharger is over the limit value, the engine needs to be operated at a reduced load to protect the supercharger and the engine.

[0083] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown.

[0084] The embodiment of the present application also provides a control device of a sequential supercharging system. It should be noted that the control device of the sequential supercharging system of the embodiment of the present application can be used to execute the control method for the sequential supercharging system provided by the embodiment of the present application. The device is used to realize the above-mentioned embodiments and preferred embodiments, and those which have been described will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiments is preferably realized in software, hardware, or a combination of software and hardware is also possible and is conceived.

[0085] The control device of the sequential supercharging system provided by the embodiment of the present application is described below.

[0086] Figure 5 is a schematic diagram of the control device of the sequential supercharging system according to the embodiment of the present application. As Figure 5As shown, the sequential supercharging system comprises at least one controlled supercharger, and the device comprises an acquisition unit 100, a determination unit 200 and an opening unit 300. The acquisition unit 100 is configured to acquire a compressor inlet pressure of the controlled supercharger, and the compressor inlet pressure is a gas pressure upstream of a compressor of the controlled supercharger. The determination unit 200 is configured to determine that a current operating state of the controlled supercharger is an unstable state in a case that the compressor inlet pressure jumps between a positive value and a negative value within a first preset time length, and the unstable state represents a state in which the controlled supercharger is switched between opening and closing. The opening unit 300 is configured to forcibly open the controlled supercharger in a case that the current operating state of the controlled supercharger is the unstable state.

[0087] The control device of the sequential supercharging system comprises an acquisition unit, a determination unit and an opening unit. The acquisition unit is configured to acquire a compressor inlet pressure of a controlled supercharger, and the compressor inlet pressure is a gas pressure upstream of a compressor of the controlled supercharger. The determination unit is configured to determine that a current operating state of the controlled supercharger is an unstable state in a case that the compressor inlet pressure jumps between a positive value and a negative value within a first preset time length, and the unstable state represents a state in which the controlled supercharger is switched between opening and closing. The opening unit is configured to forcibly open the controlled supercharger in a case that the current operating state of the controlled supercharger is the unstable state. The device can determine whether the sequential supercharger is in an abnormal state of switching back and forth by monitoring the compressor inlet pressure of the engine. In the case that the sequential supercharger is in the abnormal state of switching back and forth, the stable operation of the supercharger is ensured by forcibly opening or closing the next controlled supercharger or reducing the load of the engine, thereby ensuring the reliability of the engine and solving the problem that the fluctuation of the circulating oil volume in the prior art causes the unstable switching state of the sequential supercharger and the low reliability of the engine.

[0088] In some examples, as shown, Figure 6 As shown, the device further comprises a first acquisition module 400, a first determination module 500 and a second determination module 600. The first acquisition module is configured to acquire an operating parameter of the engine before acquiring the compressor inlet pressure of the controlled supercharger, and the operating parameter at least comprises a rotating speed of the engine and a torque of the engine. The first determination module is configured to determine that an operating state of the engine is a steady-state operation in a case that the rotating speed and the torque of the engine are both within a preset parameter range within a second preset time length. The second determination module is configured to acquire the compressor inlet pressure of the controlled supercharger in a case that the operating state of the engine is the steady-state operation. The state of the supercharger is determined in the stable working condition of the engine, so that the determination result is more accurate and the determination error caused by the unstable working condition of the engine is avoided.

[0089] As an optional solution, the sequential supercharging system comprises a plurality of controlled superchargers, and the determination unit comprises a determination subunit configured to determine that the current operating state of the target supercharger corresponding to the compressor inlet pressure is the unstable state when the compressor inlet pressure jumps between the positive value and the negative value within the first preset time length, wherein the target supercharger is one of the plurality of controlled superchargers, and there is only one target supercharger. In this way, the controlled supercharger with unstable switching state can be accurately determined, so that the supercharger can be accurately controlled.

[0090] In some examples, the sequential supercharging system comprises a basic supercharger and a controlled supercharger, and the device further comprises a second acquisition module, a third determination module and a first control module. The second acquisition module is configured to acquire a first pre-turbine exhaust temperature and a second pre-turbine exhaust temperature after the controlled supercharger is forcibly started when the current operating state of the controlled supercharger is the unstable state. The first pre-turbine exhaust temperature is the exhaust temperature upstream of the turbine of the basic supercharger, and the second pre-turbine exhaust temperature is the exhaust temperature upstream of the turbine of the controlled supercharger. The third determination module is configured to determine that the operating state of the engine at the current time is the stable state when the first pre-turbine exhaust temperature and the second pre-turbine exhaust temperature are both less than or equal to a first temperature threshold. The first control module is configured to forcibly close the controlled supercharger when at least one of the first pre-turbine exhaust temperature and the second pre-turbine exhaust temperature is greater than the first temperature threshold. According to the pre-turbine exhaust temperature, it can be determined whether the engine can be stably operated in the current state.

[0091] In some examples, the device further comprises a third acquisition module, a fourth determination module and a second control module. The third acquisition module is configured to acquire a first supercharger speed and a second supercharger speed after the controlled supercharger is forcibly closed when at least one of the first pre-turbine exhaust temperature and the second pre-turbine exhaust temperature is greater than the temperature threshold. The first supercharger speed is the speed of the basic supercharger, and the second supercharger speed is the speed of the controlled supercharger. The fourth determination module is configured to determine that the operating state of the engine at the current time is the stable state when the first supercharger speed and the second supercharger speed are both less than or equal to a first speed threshold. The second control module is configured to control the engine to reduce the operating load to a first target load when at least one of the first supercharger speed and the second supercharger speed is greater than the first speed threshold. According to the supercharger speed, it can be determined whether the engine can be stably operated in the current state.

[0092] In the embodiment, the sequential supercharging system includes a base supercharger and a plurality of controlled superchargers, and the device further includes a fourth acquisition module, a fifth determination module and a third control module. The fourth acquisition module is configured to acquire a plurality of third pre-turbine exhaust temperatures and fourth pre-turbine exhaust temperatures after forcibly starting the controlled superchargers when the current operating state of the controlled superchargers is the unstable state. The third pre-turbine exhaust temperature is the exhaust temperature upstream of the turbine of a non-target supercharger. The fourth pre-turbine exhaust temperature is the exhaust temperature upstream of the turbine of a target supercharger. The target supercharger is the controlled supercharger whose current operating state is the unstable state. The non-target supercharger is one of the controlled superchargers other than the target supercharger and the base supercharger. The fifth determination module is configured to determine that the operating state of the engine at the current time is the stable state when all of the third pre-turbine exhaust temperatures and the fourth pre-turbine exhaust temperatures are less than or equal to a second temperature threshold. The third control module is configured to forcibly stop the controlled superchargers when at least one of all of the third pre-turbine exhaust temperatures and the fourth pre-turbine exhaust temperatures is greater than the second temperature threshold. Whether the engine can be stably operated in the current state can be determined according to the pre-turbine exhaust temperature.

[0093] In an optional solution, the device further includes a fifth acquisition module, a sixth determination module and a fourth control module. The fifth acquisition module is configured to acquire a plurality of third supercharger speeds and fourth supercharger speeds after forcibly stopping the controlled superchargers when at least one of all of the third pre-turbine exhaust temperatures and the fourth pre-turbine exhaust temperatures is greater than the temperature threshold. The third supercharger speed is the speed of the non-target supercharger. The fourth supercharger speed is the speed of the target supercharger. The sixth determination module is configured to determine that the operating state of the engine at the current time is the stable state when all of the third supercharger speeds and the fourth supercharger speeds are less than or equal to a second speed threshold. The fourth control module is configured to control the engine to operate at a second target load when at least one of all of the third supercharger speeds and the fourth supercharger speeds is greater than the second speed threshold. Whether the engine can be stably operated in the current state can be determined according to the supercharger speed,

[0094] The control device of the sequential supercharging system includes a processor and a memory. The acquisition unit and the like are stored in the memory as program units. The corresponding functions are realized by the processor executing the program units stored in the memory. The modules are located in the same processor. Alternatively, the modules are located in different processors in any combination.

[0095] The processor comprises a core, and the core retrieves corresponding program units in the memory.

[0096] The memory can comprise non-permanent memory in a computer readable medium, random access memory (RAM) and / or non-volatile memory such as read-only memory (ROM) or flash memory (flash RAM), and the memory comprises at least one memory chip.

[0097] The embodiment of the present application provides a computer readable storage medium, and the computer readable storage medium comprises a stored program, wherein the program controls a device where the computer readable storage medium is located to perform the control method of the sequential supercharging system when the program is running.

[0098] Specifically, the control method of the sequential supercharging system comprises the following steps.

[0099] In step S101, the compressor inlet pressure of the controlled supercharger is acquired, and the compressor inlet pressure is the gas pressure upstream of the compressor of the controlled supercharger.

[0100] Specifically, the supercharging system is used to improve the performance of the engine by increasing the intake air pressure of the engine. The sequential supercharging system is a special supercharging system, which uses two or more superchargers to increase the intake air pressure of the engine, and one supercharger generally comprises a turbine and a compressor. By installing a multi-stage turbocharger or a turbocharger combined with a mechanical supercharger in the intake air duct, higher intake air pressure can be obtained in different speed ranges of the engine, so that the combustion efficiency and the output power are improved. The sequential supercharging system can realize greater power output without damaging the reliability of the engine.

[0101] In step S102, in the case that the compressor inlet pressure jumps between the positive value and the negative value within the first preset time length, it is determined that the current running state of the controlled supercharger is an unstable state, and the unstable state is a state in which the controlled supercharger is switched between the opening and the closing.

[0102] Specifically, since the sequential supercharging system in the engine is controlled to open based on the rotation speed and the circulating oil amount, when the circulating oil amount is at a critical point at which the supercharger inlet and exhaust control valve in the sequential supercharging system is opened and closed, slight fluctuation of the circulating oil amount will cause the supercharger inlet and exhaust control valve to open and close back and forth, and further cause the supercharger to switch between the open state and the closed state back and forth, affecting the operation and reliability of the engine. Therefore, it is necessary to stably control the open and closed state of the supercharger, so as to stably operate the sequential supercharger, and further stably operate the engine, thereby ensuring the reliability of the engine.

[0103] Step S103, in the case where the current operating state of the controlled supercharger is the unstable state, forcibly opening the controlled supercharger.

[0104] Specifically, when the engine is in stable operation, the compressor inlet pressure of the engine is monitored in real time, and if the compressor inlet pressure fluctuates back and forth between positive and negative values, the corresponding controlled supercharger of the compressor is forcibly opened, which can effectively prevent the sequential supercharger from switching back and forth, so as to stably operate the sequential supercharger, and further stably operate the engine, thereby ensuring the reliability of the engine.

[0105] Optionally, before obtaining the compressor inlet pressure of the controlled supercharger, the method further comprises: obtaining an operating parameter of the engine, the operating parameter at least including the rotation speed of the engine and the torque of the engine; in the case where the rotation speed and the torque of the engine are both within a preset parameter range within a second preset time length, determining that the operating state of the engine is stable operation; and in the case where the operating state of the engine is the stable operation, determining to obtain the compressor inlet pressure of the controlled supercharger.

[0106] Optionally, the sequential supercharging system comprises a plurality of controlled superchargers, and in the case where the compressor inlet pressure jumps between positive and negative values within a first preset time length, it is determined that the current operating state of the controlled supercharger is an unstable state, comprising: in the case where the compressor inlet pressure jumps between positive and negative values within a first preset time length, it is determined that the current operating state of a target supercharger corresponding to the compressor inlet pressure is the unstable state, wherein the target supercharger is one of the plurality of controlled superchargers, and there is only one target supercharger.

[0107] Optionally, the method further comprises, in the case that the current operating state of the controlled supercharger is the unstable state, forcibly opening the controlled supercharger, and then: obtaining a first turbine inlet temperature and a second turbine inlet temperature, the first turbine inlet temperature being a temperature of exhaust gas upstream of a turbine of the base supercharger, and the second turbine inlet temperature being a temperature of exhaust gas upstream of a turbine of the controlled supercharger; in the case that both the first turbine inlet temperature and the second turbine inlet temperature are less than or equal to a first temperature threshold, determining that the current operating state of the engine is the stable state; and in the case that at least one of the first turbine inlet temperature and the second turbine inlet temperature is greater than the first temperature threshold, forcibly closing the controlled supercharger.

[0108] Optionally, the method further comprises, in the case that at least one of the first turbine inlet temperature and the second turbine inlet temperature is greater than the temperature threshold, forcibly closing the controlled supercharger, and then: obtaining a first supercharger speed and a second supercharger speed, the first supercharger speed being a speed of the base supercharger, and the second supercharger speed being a speed of the controlled supercharger; in the case that both the first supercharger speed and the second supercharger speed are less than or equal to a first speed threshold, determining that the current operating state of the engine is the stable state; and in the case that at least one of the first supercharger speed and the second supercharger speed is greater than the first speed threshold, controlling the engine to reduce the operating load to the first target load.

[0109] Optionally, the method further comprises, in the case that the current operating state of the controlled supercharger is the unstable state, forcibly opening the controlled supercharger, and then: obtaining a plurality of third turbine inlet temperatures and a fourth turbine inlet temperature, the third turbine inlet temperatures being temperatures of exhaust gas upstream of turbines of non-target superchargers, and the fourth turbine inlet temperature being a temperature of exhaust gas upstream of a turbine of a target supercharger, the target supercharger being the controlled supercharger whose current operating state is the unstable state, and the non-target superchargers being ones of the controlled superchargers and the base supercharger other than the target supercharger; in the case that all of the third turbine inlet temperatures and the fourth turbine inlet temperature are less than or equal to a second temperature threshold, determining that the current operating state of the engine is the stable state; and in the case that at least one of all of the third turbine inlet temperatures and the fourth turbine inlet temperature is greater than the second temperature threshold, forcibly closing the controlled supercharger.

[0110] Optionally, after the controlled supercharger is forcibly closed in the case that all of the third pre-swirl temperature and the fourth pre-swirl temperature are greater than the temperature threshold, the method further comprises: obtaining a plurality of third supercharger speeds and fourth supercharger speeds, the third supercharger speed being a speed of the non-target supercharger, and the fourth supercharger speed being a speed of the target supercharger; in the case that all of the third supercharger speed and the fourth supercharger speed are less than or equal to a second speed threshold, determining that the operating state of the engine at the current time is a stable state; in the case that at least one of the third supercharger speed and the fourth supercharger speed is greater than the second speed threshold, controlling the engine to reduce the operating load to a second target load.

[0111] The embodiment of the present application provides a processor, which is used for running a program, wherein the program performs the control method of the sequential supercharging system when running.

[0112] Specifically, the control method of the sequential supercharging system comprises:

[0113] In step S101, the compressor inlet pressure of the controlled supercharger is obtained, and the compressor inlet pressure is the gas pressure upstream of the compressor of the controlled supercharger.

[0114] Specifically, the supercharging system is used to improve the performance of the engine by increasing the intake air pressure. The sequential supercharging system is a special supercharging system, which uses two or more superchargers to increase the intake air pressure of the engine, and one supercharger is generally composed of a turbine and a compressor. By installing a multi-stage turbocharger or a turbocharger combined with a mechanical supercharger in the intake duct, the engine can obtain higher intake air pressure in different speed ranges, thereby improving the combustion efficiency and output power. The sequential supercharging system can realize greater power output without compromising the reliability of the engine.

[0115] In step S102, in the case that the compressor inlet pressure jumps between a positive value and a negative value within a first preset time length, it is determined that the current operating state of the controlled supercharger is an unstable state, wherein the unstable state is a state in which the controlled supercharger is switched between opening and closing.

[0116] Specifically, since the sequential supercharging system in the engine is controlled to open based on the rotation speed and the circulating oil amount, when the circulating oil amount is at a critical point at which the supercharger inlet and exhaust control valve of the sequential supercharging system is opened and closed, slight fluctuation of the circulating oil amount will cause the supercharger inlet and exhaust control valve to open and close back and forth, and further cause the supercharger to switch between the open state and the closed state back and forth, affecting the operation and reliability of the engine. Therefore, it is necessary to stably control the open and closed state of the supercharger, so as to stably operate the sequential supercharger, and further stably operate the engine, thereby ensuring the reliability of the engine.

[0117] Step S103, in the case where the current operating state of the controlled supercharger is the unstable state, forcibly opening the controlled supercharger.

[0118] Specifically, when the engine is in stable operation, the compressor inlet pressure of the engine is monitored in real time, and if the compressor inlet pressure fluctuates back and forth between positive and negative values, the corresponding controlled supercharger of the compressor is forcibly opened, which can effectively prevent the sequential supercharger from switching back and forth, so as to stably operate the sequential supercharger, and further stably operate the engine, thereby ensuring the reliability of the engine.

[0119] Optionally, before obtaining the compressor inlet pressure of the controlled supercharger, the method further comprises: obtaining an operating parameter of the engine, the operating parameter at least including the rotation speed of the engine and the torque of the engine; in the case where the rotation speed and the torque of the engine are both within a preset parameter range within a second preset time length, determining that the operating state of the engine is stable operation; and in the case where the operating state of the engine is the stable operation, determining to obtain the compressor inlet pressure of the controlled supercharger.

[0120] Optionally, the sequential supercharging system comprises a plurality of controlled superchargers, and in the case where the compressor inlet pressure jumps between positive and negative values within a first preset time length, it is determined that the current operating state of the controlled supercharger is an unstable state, comprising: in the case where the compressor inlet pressure jumps between positive and negative values within a first preset time length, it is determined that the current operating state of a target supercharger corresponding to the compressor inlet pressure is the unstable state, wherein the target supercharger is one of the plurality of controlled superchargers, and there is only one target supercharger.

[0121] Optionally, the method further comprises, in the case that the current operating state of the controlled supercharger is the unstable state, forcibly opening the controlled supercharger, and then: obtaining a first turbine inlet temperature and a second turbine inlet temperature, the first turbine inlet temperature being a temperature of exhaust gas upstream of a turbine of the base supercharger, and the second turbine inlet temperature being a temperature of exhaust gas upstream of a turbine of the controlled supercharger; in the case that both the first turbine inlet temperature and the second turbine inlet temperature are less than or equal to a first temperature threshold, determining that the current operating state of the engine is the stable state; and in the case that at least one of the first turbine inlet temperature and the second turbine inlet temperature is greater than the first temperature threshold, forcibly closing the controlled supercharger.

[0122] Optionally, the method further comprises, in the case that at least one of the first turbine inlet temperature and the second turbine inlet temperature is greater than the temperature threshold, forcibly closing the controlled supercharger, and then: obtaining a first supercharger speed and a second supercharger speed, the first supercharger speed being a speed of the base supercharger, and the second supercharger speed being a speed of the controlled supercharger; in the case that both the first supercharger speed and the second supercharger speed are less than or equal to a first speed threshold, determining that the current operating state of the engine is the stable state; and in the case that at least one of the first supercharger speed and the second supercharger speed is greater than the first speed threshold, controlling the engine to reduce the operating load to the first target load.

[0123] Optionally, the method further comprises, in the case that the current operating state of the controlled supercharger is the unstable state, forcibly opening the controlled supercharger, and then: obtaining a plurality of third turbine inlet temperatures and a fourth turbine inlet temperature, the third turbine inlet temperatures being temperatures of exhaust gas upstream of turbines of non-target superchargers, and the fourth turbine inlet temperature being a temperature of exhaust gas upstream of a turbine of a target supercharger, the target supercharger being the controlled supercharger whose current operating state is the unstable state, and the non-target superchargers being ones of the controlled superchargers and the base supercharger other than the target supercharger; in the case that all of the third turbine inlet temperatures and the fourth turbine inlet temperature are less than or equal to a second temperature threshold, determining that the current operating state of the engine is the stable state; and in the case that at least one of all of the third turbine inlet temperatures and the fourth turbine inlet temperature is greater than the second temperature threshold, forcibly closing the controlled supercharger.

[0124] Optionally, after the controlled supercharger is forced to be closed in the case that all of the third pre-swirl temperature and the fourth pre-swirl temperature are greater than the temperature threshold, the method further comprises: acquiring a third supercharger speed and a fourth supercharger speed, the third supercharger speed being a speed of the non-target supercharger, and the fourth supercharger speed being a speed of the target supercharger; in the case that all of the third supercharger speed and the fourth supercharger speed are less than or equal to a second speed threshold, determining that the operating state of the engine at the current time is a stable state; in the case that at least one of the third supercharger speed and the fourth supercharger speed is greater than the second speed threshold, controlling the engine to reduce the operating load to a second target load.

[0125] An apparatus is provided, and the apparatus includes a processor, a memory, and a program stored on the memory and executable on the processor, and the processor implements at least the following steps when executing the program:

[0126] In step S101, the compressor inlet pressure of the controlled supercharger is acquired, and the compressor inlet pressure is the gas pressure upstream of the compressor of the controlled supercharger.

[0127] In step S102, in the case that the compressor inlet pressure jumps between a positive value and a negative value within a first preset time length, it is determined that the current operating state of the controlled supercharger is an unstable state, and the unstable state is a state in which the controlled supercharger is switched between being turned on and being turned off.

[0128] In step S103, in the case that the current operating state of the controlled supercharger is the unstable state, the controlled supercharger is forced to be turned on.

[0129] The apparatus herein can be a server, a PC, a PAD, a mobile phone, or the like.

[0130] Optionally, before the compressor inlet pressure of the controlled supercharger is acquired, the method further comprises: acquiring an operating parameter of the engine, and the operating parameter at least includes a speed of the engine and a torque of the engine; in the case that the speed and the torque of the engine are both within a preset parameter range within a second preset time length, it is determined that the operating state of the engine is a steady state; and in the case that the operating state of the engine is the steady state, the compressor inlet pressure of the controlled supercharger is acquired.

[0131] Optionally, the sequential supercharging system comprises a plurality of controlled superchargers, and in a case where the compressor inlet pressure jumps between a positive value and a negative value within a first preset time length, the current operating state of the controlled superchargers is determined to be an unstable state, comprising: in a case where the compressor inlet pressure jumps between a positive value and a negative value within a first preset time length, the current operating state of a target supercharger corresponding to the compressor inlet pressure is determined to be the unstable state, wherein the target supercharger is one of the plurality of controlled superchargers, and the target supercharger is only one.

[0132] Optionally, the sequential supercharging system comprises a base supercharger and a controlled supercharger, and in a case where the current operating state of the controlled supercharger is the unstable state, after the controlled supercharger is forcibly started, the method further comprises: obtaining a first turbine inlet temperature and a second turbine inlet temperature, the first turbine inlet temperature being an exhaust temperature upstream of a turbine of the base supercharger, and the second turbine inlet temperature being an exhaust temperature upstream of a turbine of the controlled supercharger; in a case where both the first turbine inlet temperature and the second turbine inlet temperature are less than or equal to a first temperature threshold, determining that the current operating state of the engine is a stable state; and in a case where at least one of the first turbine inlet temperature and the second turbine inlet temperature is greater than the first temperature threshold, forcibly stopping the controlled supercharger.

[0133] Optionally, in a case where at least one of the first turbine inlet temperature and the second turbine inlet temperature is greater than the temperature threshold, after the controlled supercharger is forcibly stopped, the method further comprises: obtaining a first supercharger speed and a second supercharger speed, the first supercharger speed being a speed of the base supercharger, and the second supercharger speed being a speed of the controlled supercharger; in a case where both the first supercharger speed and the second supercharger speed are less than or equal to a first speed threshold, determining that the current operating state of the engine is a stable state; and in a case where at least one of the first supercharger speed and the second supercharger speed is greater than the first speed threshold, controlling the engine to reduce the operating load to a first target load.

[0134] Optionally, the sequential supercharging system comprises a base supercharger and a plurality of controlled superchargers, in the case that the current operating state of the controlled supercharger is the unstable state, after the controlled supercharger is forcibly started, the method further comprises: obtaining a plurality of third turbine inlet temperatures and fourth turbine inlet temperatures, the third turbine inlet temperature is the exhaust gas temperature upstream of the turbine of a non-target supercharger, the fourth turbine inlet temperature is the exhaust gas temperature upstream of the turbine of a target supercharger, the target supercharger is the controlled supercharger whose current operating state is the unstable state, and the non-target supercharger is one of the controlled superchargers other than the target supercharger and the base supercharger; in the case that all of the third turbine inlet temperatures and the fourth turbine inlet temperatures are less than or equal to a second temperature threshold, it is determined that the operating state of the engine at the current time is a stable state; in the case that at least one of the third turbine inlet temperatures and the fourth turbine inlet temperatures is greater than the second temperature threshold, the controlled supercharger is forcibly stopped.

[0135] Optionally, in the case that at least one of the third turbine inlet temperatures and the fourth turbine inlet temperatures is greater than the temperature threshold, after the controlled supercharger is forcibly stopped, the method further comprises: obtaining a plurality of third supercharger speeds and fourth supercharger speeds, the third supercharger speed is the speed of the non-target supercharger, and the fourth supercharger speed is the speed of the target supercharger; in the case that all of the third supercharger speeds and the fourth supercharger speeds are less than or equal to a second speed threshold, it is determined that the operating state of the engine at the current time is a stable state; in the case that at least one of the third supercharger speeds and the fourth supercharger speeds is greater than the second speed threshold, the engine is controlled to reduce the operating load to a second target load.

[0136] The application also provides a computer program product adapted to execute a program comprising at least the following steps when executed on a data processing device:

[0137] Step S101, obtaining the compressor inlet pressure of the controlled supercharger, the compressor inlet pressure being the gas pressure upstream of the compressor of the controlled supercharger;

[0138] Step S102, in the case that the compressor inlet pressure jumps between a positive value and a negative value within a first preset time length, determining that the current operating state of the controlled supercharger is an unstable state, wherein the unstable state is a state in which the controlled supercharger is switched between starting and stopping;

[0139] Step S103, in the case that the current operating state of the controlled supercharger is the unstable state, forcibly starting the controlled supercharger.

[0140] Optionally, before the pressure at the compressor inlet of the controlled supercharger is obtained, the method further comprises: obtaining an operating parameter of the engine, the operating parameter at least including a rotational speed of the engine and a torque of the engine; determining that the engine is in a steady state operation when the rotational speed and the torque of the engine are both within a preset parameter range within a second preset time period; and determining to obtain the pressure at the compressor inlet of the controlled supercharger when the engine is in the steady state operation.

[0141] Optionally, the sequential supercharging system includes a plurality of controlled superchargers, and the method further comprises: determining that a current operating state of a target supercharger corresponding to the pressure at the compressor inlet is an unstable state when the pressure at the compressor inlet jumps between a positive value and a negative value within a first preset time period, the target supercharger being one of the plurality of controlled superchargers, and the target supercharger being only one.

[0142] Optionally, the sequential supercharging system includes a base supercharger and a controlled supercharger, and the method further comprises: obtaining a first pre-turbine exhaust temperature and a second pre-turbine exhaust temperature when the current operating state of the controlled supercharger is the unstable state, the first pre-turbine exhaust temperature being a temperature of exhaust upstream of a turbine of the base supercharger, and the second pre-turbine exhaust temperature being a temperature of exhaust upstream of a turbine of the controlled supercharger; determining that the engine is in a steady state operation at a current time when the first pre-turbine exhaust temperature and the second pre-turbine exhaust temperature are both less than or equal to a first temperature threshold; and forcibly closing the controlled supercharger when at least one of the first pre-turbine exhaust temperature and the second pre-turbine exhaust temperature is greater than the first temperature threshold.

[0143] Optionally, the method further comprises: obtaining a first supercharger rotational speed and a second supercharger rotational speed when the controlled supercharger is forcibly closed, the first supercharger rotational speed being a rotational speed of the base supercharger, and the second supercharger rotational speed being a rotational speed of the controlled supercharger; determining that the engine is in a steady state operation at a current time when the first supercharger rotational speed and the second supercharger rotational speed are both less than or equal to a first rotational speed threshold; and controlling the engine to reduce an operating load to a first target load when at least one of the first supercharger rotational speed and the second supercharger rotational speed is greater than the first rotational speed threshold.

[0144] Optionally, the sequential supercharging system comprises a base supercharger and a plurality of controlled superchargers, in the case that the current operating state of the controlled superchargers is the unstable state, after the controlled superchargers are forcibly opened, the method further comprises: obtaining a plurality of third turbine inlet exhaust temperatures and fourth turbine inlet exhaust temperatures, the third turbine inlet exhaust temperature is the exhaust temperature upstream of the turbine of a non-target supercharger, the fourth turbine inlet exhaust temperature is the exhaust temperature upstream of the turbine of a target supercharger, the target supercharger is the controlled supercharger whose current operating state is the unstable state, and the non-target supercharger is one of the controlled superchargers other than the target supercharger and the base supercharger; in the case that all of the third turbine inlet exhaust temperatures and the fourth turbine inlet exhaust temperatures are less than or equal to a second temperature threshold, determining that the operating state of the engine at the current time is the stable state; in the case that at least one of the third turbine inlet exhaust temperatures and the fourth turbine inlet exhaust temperatures is greater than the second temperature threshold, forcibly closing the controlled superchargers.

[0145] Optionally, in the case that at least one of the third turbine inlet exhaust temperatures and the fourth turbine inlet exhaust temperatures is greater than the temperature threshold, after the controlled superchargers are forcibly closed, the method further comprises: obtaining a plurality of third supercharger rotational speeds and fourth supercharger rotational speeds, the third supercharger rotational speed is the rotational speed of the non-target supercharger, and the fourth supercharger rotational speed is the rotational speed of the target supercharger; in the case that all of the third supercharger rotational speeds and the fourth supercharger rotational speeds are less than or equal to a second rotational speed threshold, determining that the operating state of the engine at the current time is the stable state; in the case that at least one of the third supercharger rotational speeds and the fourth supercharger rotational speeds is greater than the second rotational speed threshold, controlling the engine to reduce the operating load to a second target load.

[0146] Obviously, those skilled in the art should understand that the modules or steps of the present application described above can be realized by general computing devices, which can be concentrated on a single computing device or distributed on a network composed of multiple computing devices, and can be realized by program codes executable by the computing devices, so that they can be stored in storage devices and executed by the computing devices, and in some cases, the steps shown or described can be executed in different order, or they can be respectively manufactured into individual integrated circuit modules, or multiple modules or steps among them can be manufactured into a single integrated circuit module. Thus, the present application is not limited to any specific combination of hardware and software.

[0147] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0148] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0149] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0150] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0151] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0152] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0153] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology for information storage. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to computing devices. According to the definition herein, computer-readable media does not include transitory media such as modulated data signals and carriers.

[0154] It should also be noted that the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0155] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0156] 1) The control method of the above-mentioned sequential supercharging system of the present application first acquires the compressor inlet pressure of the controlled supercharger, which is the gas pressure upstream of the compressor of the controlled supercharger; then in the case that the compressor inlet pressure jumps between positive and negative values within the first preset time, it is determined that the current running state of the controlled supercharger is unstable state, wherein the unstable state is the state of the controlled supercharger switching between opening and closing; finally, in the case that the current running state of the controlled supercharger is unstable state, the controlled supercharger is forcibly opened. This method monitors the compressor inlet pressure of the engine to determine whether the sequential supercharger is in the abnormal state of switching back and forth. In the case of the abnormal state of the sequential supercharger switching back and forth, the stable operation of the supercharger is ensured by forcibly opening or closing the next controlled supercharger or the engine running at reduced load, thereby ensuring the reliability of the engine and solving the problem that the fluctuation of the circulating oil quantity in the prior art causes the unstable state of the sequential supercharger switching state, resulting in low reliability of the engine.

[0157] 2), The control device of the above-mentioned sequential supercharging system of the application comprises an acquisition unit, a determination unit and an opening unit, the acquisition unit is used for acquiring the compressor inlet pressure of the controlled supercharger, the compressor inlet pressure is the gas pressure upstream of the compressor of the controlled supercharger; the determination unit is used for determining that the current running state of the controlled supercharger is an unstable state in the case that the compressor inlet pressure jumps between positive and negative values within a first preset time length, wherein the unstable state is a state in which the controlled supercharger switches between opening and closing; the opening unit is used for forcibly opening the controlled supercharger in the case that the current running state of the controlled supercharger is the unstable state. The device judges whether the sequential supercharger is in the abnormal state of switching back and forth by monitoring the compressor inlet pressure of the engine, and in the case that the sequential supercharger is in the abnormal state of switching back and forth, the stable running of the supercharger is ensured by forcibly opening or closing the next controlled supercharger or the engine running at reduced load, thereby ensuring the reliability of the engine and solving the problem that the fluctuation of the circulating oil quantity in the prior art causes the unstable switching state of the sequential supercharger, which leads to the low reliability of the engine.

[0158] The above only describes the preferred embodiments of the application and is not intended to limit the application. Those skilled in the art can make various modifications and changes to the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A control method for a sequential charging system including at least one controlled supercharger, said sequential charging system being located in an engine, characterized in that, The method comprises: obtaining the compressor inlet pressure of the controlled supercharger, the compressor inlet pressure being the gas pressure upstream of the compressor of the controlled supercharger; in the case where the compressor inlet pressure jumps between positive and negative values within a first preset time length, determining that the current operating state of the controlled supercharger is an unstable state, wherein the unstable state is a state in which the controlled supercharger switches between opening and closing; in the case where the current operating state of the controlled supercharger is the unstable state, forcibly opening the controlled supercharger.

2. The control method according to claim 1, characterized by, Before obtaining the compressor inlet pressure of the controlled supercharger, the method further comprises: obtaining the operating parameters of the engine, the operating parameters at least including the speed of the engine and the torque of the engine; in the case where the speed and the torque of the engine are both within a preset parameter range within a second preset time length, determining that the operating state of the engine is a steady state operation; in the case where the operating state of the engine is the steady state operation, determining to obtain the compressor inlet pressure of the controlled supercharger.

3. The control method according to claim 1, characterized by, The sequential supercharging system comprises a plurality of controlled superchargers, and in the case where the compressor inlet pressure jumps between positive and negative values within a first preset time length, determining that the current operating state of the controlled supercharger is an unstable state, comprises: in the case where the compressor inlet pressure jumps between positive and negative values within a first preset time length, determining that the current operating state of a target supercharger corresponding to the compressor inlet pressure is the unstable state, wherein the target supercharger is one of the plurality of controlled superchargers, and there is only one target supercharger.

4. The control method according to claim 1, characterized by, The sequential supercharging system comprises a base supercharger and a controlled supercharger, and after forcibly opening the controlled supercharger in the case where the current operating state of the controlled supercharger is the unstable state, the method further comprises: obtaining a first turbine inlet temperature and a second turbine inlet temperature, the first turbine inlet temperature being the exhaust gas temperature upstream of the turbine of the base supercharger, and the second turbine inlet temperature being the exhaust gas temperature upstream of the turbine of the controlled supercharger; in the case where the first turbine inlet temperature and the second turbine inlet temperature are both less than or equal to a first temperature threshold, determining that the operating state of the engine at the current time is a stable state; in the case where at least one of the first turbine inlet temperature and the second turbine inlet temperature is greater than the first temperature threshold, forcibly closing the controlled supercharger.

5. The control method according to claim 4, characterized by After forcibly closing the controlled supercharger in the case where at least one of the first turbine inlet temperature and the second turbine inlet temperature is greater than the temperature threshold, the method further comprises: obtaining a first supercharger speed and a second supercharger speed, the first supercharger speed being the speed of the base supercharger, and the second supercharger speed being the speed of the controlled supercharger; in the case where the first supercharger speed and the second supercharger speed are both less than or equal to a first speed threshold, determining that the operating state of the engine at the current time is a stable state; In a case that at least one of the first supercharger speed and the second supercharger speed is greater than the first speed threshold, the engine is controlled to reduce the operating load to a first target load operation.

6. The control method according to claim 1, characterized by In a case that the current operating state of the controlled supercharger is the unstable state, the method further comprises: obtaining a plurality of third turbine discharge temperatures and fourth turbine discharge temperatures, the third turbine discharge temperature being an exhaust temperature upstream of a turbine of a non-target supercharger, the fourth turbine discharge temperature being an exhaust temperature upstream of a turbine of a target supercharger, the target supercharger being the controlled supercharger whose current operating state is the unstable state, the non-target supercharger being one of the controlled superchargers other than the target supercharger and the base supercharger; In a case that all of the third turbine discharge temperatures and the fourth turbine discharge temperatures are less than or equal to a second temperature threshold, determining that the current operating state of the engine is a stable state; In a case that at least one of all of the third turbine discharge temperatures and the fourth turbine discharge temperatures is greater than the second temperature threshold, forcibly closing the controlled supercharger.

7. The control method according to claim 6, characterized by In a case that at least one of all of the third turbine discharge temperatures and the fourth turbine discharge temperatures is greater than the temperature threshold, the method further comprises: obtaining a plurality of third supercharger speeds and fourth supercharger speeds, the third supercharger speed being a speed of the non-target supercharger, the fourth supercharger speed being a speed of the target supercharger; In a case that all of the third supercharger speeds and the fourth supercharger speeds are less than or equal to a second speed threshold, determining that the current operating state of the engine is a stable state; In a case that at least one of all of the third supercharger speeds and the fourth supercharger speeds is greater than the second speed threshold, controlling the engine to reduce the operating load to a second target load operation.

8. A control device of a sequential turbocharging system, characterized by comprising: The sequential supercharging system comprises at least one controlled supercharger, the sequential supercharging system being located in an engine, and the device comprises: an obtaining unit, configured to obtain a compressor inlet pressure of the controlled supercharger, the compressor inlet pressure being a gas pressure upstream of a compressor of the controlled supercharger; a determining unit, configured to, in a case that the compressor inlet pressure jumps between a positive value and a negative value within a first preset time length, determine that a current operating state of the controlled supercharger is an unstable state, wherein the unstable state represents a state in which the controlled supercharger switches between being turned on and being turned off; an opening unit, configured to, in a case that the current operating state of the controlled supercharger is the unstable state, forcibly open the controlled supercharger.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises a stored program, wherein the computer readable storage medium controls a device in which the computer readable storage medium is located to perform the control method of the sequential supercharging system according to any one of claims 1 to 7 when the program is executed.

10. An electronic device, comprising: comprises: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including programs for performing the control method of the sequential supercharging system according to any one of claims 1 to 7.

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