Control method and system for supercharger switching

Abstract

The application belongs to the technical field of engines, and particularly relates to a control method and system for supercharger switching, which comprises the following steps: controlling T15 power-on of an engine, judging whether the supercharger sequence has been switched, calculating a first degradation efficiency of a first supercharger according to the fact that the supercharger sequence has not been switched, determining to switch the supercharger sequence according to the fact that the first degradation efficiency meets a first preset condition, calculating a second degradation efficiency of a second supercharger according to the fact that the supercharger sequence has been switched, and determining to switch the supercharger sequence according to the fact that the second degradation efficiency meets a second preset condition. According to the control method for supercharger switching, the degradation efficiencies of the first supercharger and the second supercharger are calculated respectively, the degradation degrees of the first supercharger and the second supercharger can be determined, whether to switch the supercharger is determined according to the degrees, and the replacement frequency of the supercharger is reduced by avoiding rapid wear caused by long-term use of one supercharger.

Description

Technical Field

[0001] This invention belongs to the field of engine technology, specifically relating to a control method and system for turbocharger switching. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] A sequential turbocharging system consists of two or more turbochargers connected in parallel. As the turbocharged engine speed and load increase, they are activated sequentially. When the speed and load fall below a certain set value, the exhaust gas supply to one or more turbocharger turbines and the air supply to the compressor are cut off. Conversely, when the engine speed and load exceed the set value, the cut-off turbocharger is reactivated. In this way, under specific operating conditions, the turbocharger is activated according to different requirements to meet the engine's needs.

[0004] Existing technology cannot switch turbochargers sequentially based on actual turbocharger efficiency. This may result in a high-efficiency turbocharger being switched to a low-efficiency turbocharger, which can easily lead to severe deterioration or even damage of the low-efficiency turbocharger after long-term use. Summary of the Invention

[0005] The purpose of this invention is to at least solve the problem of severe wear and degradation caused by prolonged use of a single turbocharger due to the inability to switch turbochargers based on their deterioration level and efficiency. This purpose is achieved through the following technical solution:

[0006] A first aspect of the present invention provides a control method for turbocharger switching, comprising:

[0007] Power on T15, which controls the engine;

[0008] Determine if the turbocharger sequence has been switched;

[0009] Calculate the first degradation efficiency of the first turbocharger, assuming that the turbocharger sequence has not been switched.

[0010] The order of switching turbochargers is determined based on the first preset condition that the first degradation efficiency meets the first deterioration efficiency.

[0011] Calculate the second degradation efficiency of the second turbocharger based on the turbocharger sequence switching.

[0012] The order of switching turbochargers is determined based on the second preset condition that the second degradation efficiency meets the second degradation efficiency.

[0013] According to the turbocharger switching control method of this invention, the engine's T15 is energized, enabling the engine's ECU. The engine includes a basic turbocharger and two controllable turbochargers, namely a first turbocharger and a second turbocharger. During engine operation, the first turbocharger engages first, followed by the second turbocharger. The system first determines whether the turbocharger sequence has been switched during engine operation. If the turbocharger sequence has not been switched, it indicates that the first turbocharger has been continuously operating. Therefore, the first degradation efficiency of the first turbocharger is calculated, indicating the degree of degradation of the first turbocharger. Based on the degree of degradation of the first turbocharger, a decision is made regarding whether to switch the sequence, including switching from the first turbocharger to the second turbocharger or switching from the first turbocharger to simultaneous operation of both the first and second turbochargers. In two scenarios, to avoid rapid wear and deterioration of the first turbocharger due to prolonged use, the replacement frequency of the first turbocharger is reduced, and its service life is extended. When the turbocharger sequence has been switched, it indicates that the engine has switched from operating with the first turbocharger to operating with the second turbocharger. Therefore, the second degree of deterioration of the second turbocharger is calculated. The second degree of deterioration indicates the severity of the second turbocharger's deterioration. Based on the severity of the second turbocharger's deterioration, it is determined whether to switch the sequence, including switching from the second turbocharger to the first turbocharger or switching from the second turbocharger to simultaneous operation of the second and first turbochargers. This avoids rapid wear and deterioration of the second turbocharger due to prolonged use, reduces the replacement frequency of the second turbocharger, and extends its service life.

[0014] In addition, the turbocharger switching control method according to embodiments of the present invention may also have the following additional technical features:

[0015] In some embodiments of the present invention, before calculating the first deterioration efficiency of the first turbocharger based on the fact that the turbocharger sequence has not been switched, the method further includes: obtaining the standard efficiency of the first turbocharger.

[0016] The calculation of the first degradation efficiency of the first turbocharger based on the fact that the turbocharger sequence has not been switched includes:

[0017] Calculate the first efficiency of the first booster;

[0018] Calculate the first degradation efficiency of the first turbocharger according to the formula η=(η3-η1) / η3;

[0019] Wherein, η1 is the first efficiency of the first turbocharger, η3 is the standard efficiency of the first turbocharger, and η is the first deterioration efficiency.

[0020] In some embodiments of the present invention, before calculating the second deterioration efficiency of the second turbocharger according to the turbocharger sequence switching, the method further includes: obtaining the standard efficiency of the second turbocharger;

[0021] The calculation of the second degradation efficiency of the second turbocharger based on the turbocharger sequence switching includes:

[0022] Calculate the second efficiency of the second turbocharger;

[0023] The second degradation efficiency of the second turbocharger is calculated according to the formula η=(η4-η2) / η4;

[0024] Wherein, η2 is the second efficiency of the second turbocharger, η4 is the standard efficiency of the second turbocharger, and η is the second deterioration efficiency.

[0025] In some embodiments of the present invention, before determining the switching order of turbochargers based on the first degradation efficiency satisfying the first preset condition, the method further includes: determining whether the efficiency of the first turbocharger is less than the efficiency of the second turbocharger based on the first degradation efficiency being greater than the first preset efficiency.

[0026] The step of determining the turbocharger switching sequence based on the first preset condition being met by the first degradation efficiency includes:

[0027] The order of switching turbochargers is determined based on the number of times the efficiency of the first turbocharger is less than that of the second turbocharger, which satisfies a first preset number of times.

[0028] In some embodiments of the present invention, before determining the switching order of the turbochargers based on the second degradation efficiency satisfying the second preset condition, the method further includes: determining whether the efficiency of the second turbocharger is less than the efficiency of the first turbocharger based on the second degradation efficiency being greater than the second preset efficiency.

[0029] The step of determining the turbocharger switching sequence based on the second preset condition being met by the second degradation efficiency includes:

[0030] The order of switching turbochargers is determined based on the number of times the efficiency of the second turbocharger is less than that of the first turbocharger, which satisfies a second preset number of times.

[0031] In some embodiments of the present invention, in determining the turbocharger switching sequence based on a first preset number of times the efficiency of the first turbocharger is less than the efficiency of the second turbocharger:

[0032] Based on the engine's operating condition of medium speed and medium load, the second turbocharger is determined to be in operation;

[0033] Based on the engine's operating conditions of high speed and high load, it is determined that the first turbocharger and the second turbocharger operate simultaneously.

[0034] In some embodiments of the present invention, in determining the turbocharger switching sequence based on a second preset number of times the efficiency of the second turbocharger is less than the efficiency of the first turbocharger:

[0035] Based on the engine's operating condition being medium speed and medium load, the first turbocharger is determined to be in operation;

[0036] Based on the engine's operating conditions of high speed and high load, it is determined that the first turbocharger and the second turbocharger operate simultaneously.

[0037] In some embodiments of the present invention, the method further includes, before calculating the first efficiency of the first booster, obtaining the compressor inlet temperature Tin, the compressor outlet temperature Tout, the compressor outlet pressure Pout, the compressor inlet pressure Pin, and the specific heat π.

[0038] The calculation of the first efficiency of the first turbocharger includes: calculating the first efficiency according to the formulas K=Pout / Pin and η1=Tin((π(K-1) / K)-1) / (Tout-Tin).

[0039] In some embodiments of the present invention, the method further includes, before calculating the second efficiency of the second booster, obtaining the compressor inlet temperature Tin, the compressor outlet temperature Tout, the compressor outlet pressure Pout, the compressor inlet pressure Pin, and the specific heat π.

[0040] The calculation of the second efficiency of the second turbocharger includes: calculating the second efficiency according to the formulas K=Pout / Pin and η2=Tin((π(K-1) / K)-1) / (Tout-Tin).

[0041] A second aspect of the present invention also provides a control system for turbocharger switching, comprising:

[0042] The control module is used to control the power-on of the engine's T15;

[0043] The judgment module is used to determine whether the turbocharger sequence has been switched.

[0044] A first calculation module is used to calculate the first degradation efficiency of the first turbocharger.

[0045] A first determining module is used to determine the switching sequence of the turbochargers based on the first degradation efficiency.

[0046] The second calculation module is used to calculate the second degradation efficiency of the second turbocharger.

[0047] The second determining module is used to determine the switching sequence of the turbocharger based on the second degradation efficiency.

[0048] According to the present invention, a turbocharger switching control system controls engine operation through a control module, and a judgment module is used to determine whether the turbocharger sequence has been switched during engine operation. A first calculation module and a first determination module calculate the first degradation efficiency of the first turbocharger and determine whether to switch the order. A second calculation module and a second determination module calculate the second degradation efficiency of the second turbocharger and determine whether to switch the order. The switching between turbochargers is performed based on the degradation efficiency, avoiding rapid wear and degradation caused by long-term use of a single turbocharger, reducing the replacement frequency of turbochargers, and extending the service life of turbochargers. Attached Figure Description

[0049] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0050] Figure 1 This is a schematic diagram of the sequential booster system according to an embodiment of the present invention;

[0051] Figure 2 This is a flowchart illustrating the control method for turbocharger switching according to an embodiment of the present invention;

[0052] Figure 3 for Figure 2 The flowchart shown is a schematic diagram of the calculation of the first degradation efficiency of the first turbocharger based on the fact that the turbocharger sequence has not been switched.

[0053] Figure 4 for Figure 2 The flowchart shown illustrates the calculation of the second degradation efficiency of the second turbocharger based on the turbocharger sequence switching.

[0054] Figure 5 for Figure 2 The flowchart shown illustrates the process of determining the switching sequence of turbochargers based on the first preset condition being met by the first degradation efficiency.

[0055] Figure 6 for Figure 2 The flowchart shown illustrates the process of determining the switching sequence of turbochargers based on the second preset condition being met by the second degradation efficiency.

[0056] Figure 7 This is a structural block diagram of the booster switching control system according to an embodiment of the present invention.

[0057] Figure label:

[0058] 1. Basic turbocharger;

[0059] 2. First turbocharger;

[0060] 3. Second turbocharger;

[0061] 4. Intercooler. Detailed Implementation

[0062] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0063] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof.

[0064] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0065] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0066] like Figure 1 As shown, a sequential supercharging system includes: a basic supercharger 1, a first supercharger 2, a second supercharger 3, an intercooler 4, several intake control valves, and several exhaust intake valves.

[0067] like Figures 2-6 As shown, a turbocharger switching control method according to an embodiment of the present invention includes:

[0068] Power on T15, which controls the engine;

[0069] Determine if the turbocharger sequence has been switched;

[0070] Calculate the first deterioration efficiency of the first turbocharger 2, assuming that the turbocharger sequence has not been switched.

[0071] The order of switching turbochargers is determined based on the first preset condition that the first deterioration efficiency meets the first preset condition.

[0072] Calculate the second degradation efficiency of the second turbocharger 3 based on the turbocharger sequence switching.

[0073] The order of switching turbochargers is determined based on the second preset condition that the second degradation efficiency meets the second degradation efficiency.

[0074] According to the turbocharger switching control method of the present invention, the engine's T15 is energized to enable the engine's ECU. The engine includes a basic turbocharger 1 and two controllable turbochargers, namely a first turbocharger 2 and a second turbocharger 3. During engine operation, the first turbocharger 2 engages first, followed by the second turbocharger 3. The system first determines whether the turbocharger sequence has been switched during engine operation. If the turbocharger sequence has not been switched, it indicates that the first turbocharger 2 has been continuously operating. Therefore, the first degradation efficiency of the first turbocharger 2 is calculated, indicating the degree of degradation of the first turbocharger 2. Based on the degree of degradation of the first turbocharger 2, the system determines whether to perform a switching sequence, including switching from the first turbocharger 2 to the second turbocharger 3, or having both the first turbocharger 2 and the second turbocharger 3 operate simultaneously. To avoid rapid wear and deterioration of the first turbocharger 2 due to prolonged use, the replacement frequency of the first turbocharger 2 is reduced, and its service life is extended. When the turbocharger sequence has been switched, it indicates that the engine has switched from the first turbocharger 2 operating state to the second turbocharger 3 operating state. Therefore, the second degree of deterioration of the second turbocharger 3 is calculated. The second degree of deterioration indicates the severity of the deterioration of the second turbocharger 3. Based on the severity of the deterioration of the second turbocharger 3, it is determined whether to switch the sequence, including switching from the second turbocharger 3 to the first turbocharger 2 or switching from the second turbocharger 3 to the simultaneous operation of the second turbocharger 3 and the first turbocharger 2. This avoids rapid wear and deterioration of the second turbocharger 3 due to prolonged use, reduces the replacement frequency of the second turbocharger 3, and extends its service life.

[0075] In some embodiments of the present invention, when calculating the first deterioration efficiency, according to the formula η=(η3-η1) / η3, where η1 is the first efficiency of the first turbocharger 2, η3 is the standard efficiency of the first turbocharger 2, and η is the first deterioration efficiency, it is necessary to know the first efficiency and standard efficiency of the first turbocharger 2. The first efficiency is the actual efficiency of the first turbocharger 2. The first efficiency of the first turbocharger 2 needs to be calculated based on the parameters under the engine operating state. When calculating the first efficiency, according to the formulas K=Pout / Pin and η1=Tin((π(K-1) / K)-1) / (Tout-Tin), it is necessary to know the compressor inlet temperature Tin, compressor outlet temperature Tout, compressor outlet pressure Pout, compressor inlet pressure Pin, and specific heat π. In the current driving cycle of the engine, both the first turbocharger 2 and the second turbocharger 3 are turned on. The engine speed change rate, intake air volume change rate, and engine speed and intake air volume are all controlled within a certain range. Multiple sensors are used to acquire the compressor inlet temperature Tin, compressor outlet temperature Tout, compressor outlet pressure Pout, compressor inlet pressure Pin, and specific heat π. This acquisition process must be completed before calculating the first efficiency. After acquisition, the specific heat K is calculated first according to the formula K = Pout / Pin. Then, the first efficiency is calculated according to the formula η1 = Tin((π(K-1) / K)-1) / (Tout-Tin). The value of the first efficiency is stored and will be called when calculating the first deterioration efficiency. The standard efficiency of the first turbocharger 2 can be obtained by looking up a table. Based on the efficiency characteristics of the turbocharger, the current compressor pressure ratio K and intake air volume are used as the reference for the lookup, and the standard efficiency is stored and will be called when calculating the first deterioration efficiency.

[0076] In some embodiments of the present invention, when calculating the second deterioration efficiency, according to the formula η=(η4-η2) / η4, where η2 is the second efficiency of the second turbocharger 3, η4 is the standard efficiency of the second turbocharger 3, and η is the second deterioration efficiency, it is necessary to know the second efficiency and standard efficiency of the second turbocharger 3. The second efficiency is the actual efficiency of the second turbocharger 3. The second efficiency of the second turbocharger 3 needs to be calculated based on the parameters under the engine operating state. When calculating the second efficiency, according to the formulas K=Pout / Pin and η2=Tin((π(K-1) / K)-1) / (Tout-Tin), it is necessary to know the compressor inlet temperature Tin, compressor outlet temperature Tout, compressor outlet pressure Pout, compressor inlet pressure Pin, and specific heat π. In the current driving cycle of the engine, both the first turbocharger 2 and the second turbocharger 3 are turned on. The engine speed change rate, intake air volume change rate, and engine speed and intake air volume are all controlled within a certain range. Multiple sensors are used to acquire the compressor inlet temperature Tin, compressor outlet temperature Tout, compressor outlet pressure Pout, compressor inlet pressure Pin, and specific heat π. This acquisition process must be completed before calculating the second efficiency. After acquisition, the specific heat K is first calculated according to the formula K = Pout / Pin. Then, the second efficiency is calculated according to the formula η2 = Tin((π(K-1) / K)-1) / (Tout-Tin). The value of the second efficiency is stored and will be called when calculating the second deterioration efficiency. The standard efficiency of the second turbocharger 3 can be obtained by looking up a table. Based on the efficiency characteristics of the turbocharger, the current compressor pressure ratio K and intake air volume are used as the reference for the lookup, and the standard efficiency is stored and will be called when calculating the second deterioration efficiency.

[0077] In some embodiments of the present invention, after calculating the first degradation efficiency, it is necessary to determine whether the first degradation efficiency is greater than the first preset efficiency. When the first degradation efficiency is greater than the first preset efficiency, it indicates that the first turbocharger 2 is severely damaged. Therefore, it is necessary to switch the turbocharger to avoid severe wear and degradation or even failure caused by long-term use of the first turbocharger 2. The switching sequence of the first turbocharger 2 includes two cases: the first is switching from the first turbocharger 2 to the second turbocharger 3, and the second is switching from the first turbocharger 2 to both the first turbocharger 2 and the second turbocharger 3. Therefore, it is necessary to determine how to switch, and the strategy adopted is to determine... The efficiency of the first turbocharger 2 and the second turbocharger 3 are compared. When the efficiency of the first turbocharger 2 is less than that of the second turbocharger 3, and the cumulative number of times this occurs reaches a first preset number, it indicates that the first turbocharger 2 cannot meet the engine's needs, while the second turbocharger 3 can. Therefore, a switching sequence is determined. The switching sequence is confirmed by accumulating the number of times this occurs, which improves the precision control of the switching and avoids abnormal switching caused by misjudgment. When the efficiency of the first turbocharger 2 is greater than that of the second turbocharger 3, it indicates that the first turbocharger 2 can meet the engine's needs, and a switching sequence is determined not to occur.

[0078] In some embodiments of the present invention, after calculating the second degradation efficiency, it is necessary to determine whether the second degradation efficiency is greater than the second preset efficiency. When the second degradation efficiency is greater than the second preset efficiency, it indicates that the second turbocharger 3 is severely damaged. Therefore, it is necessary to switch the turbocharger to avoid severe wear and degradation or even failure caused by long-term use of the second turbocharger 3. The switching sequence of the second turbocharger 3 includes two cases: the first is switching from the second turbocharger 3 to the first turbocharger 2, and the second is switching from the second turbocharger 3 to both the second turbocharger 3 and the first turbocharger 2. Therefore, it is necessary to determine how to switch, and the strategy adopted is to determine... The efficiency of the second turbocharger 3 and the first turbocharger 2 is compared. When the efficiency of the second turbocharger 3 is less than that of the first turbocharger 2, and the cumulative number of times this occurs reaches a second preset number, it indicates that the second turbocharger 3 cannot meet the engine's needs, while the first turbocharger 2 can. Therefore, a switching sequence is determined. The switching sequence is confirmed by accumulating the number of times this occurs, which improves the precision control of the switching and avoids abnormal switching caused by misjudgment. When the efficiency of the second turbocharger 3 is greater than that of the first turbocharger 2, it indicates that the second turbocharger 3 can meet the engine's needs, and a switching sequence is not determined.

[0079] In some embodiments of the present invention, when the efficiency of the first turbocharger 2 is less than the efficiency of the second turbocharger 3, and the cumulative number of times the efficiency is less than the second turbocharger 3 reaches a first preset number, a switching sequence is determined. The switching sequence performed by the first turbocharger 2 includes two cases: the first is switching from the first turbocharger 2 to the second turbocharger 3, and the second is switching from the first turbocharger 2 to both the first turbocharger 2 and the second turbocharger 3. During the switching, the first or second switching sequence needs to be determined based on the engine's operating conditions. The engine includes a total of three turbochargers: one basic turbocharger 1 and two controllable turbochargers. The two controllable turbochargers are respectively the first... A supercharger 2 and a second supercharger 3 are configured such that when the engine is at low speed and low load, the basic supercharger 1 operates; when the engine is at medium speed and medium load, the basic supercharger 1 and one of the controllable superchargers operate; and when the engine is at high speed and high load, both the basic supercharger 1 and the two controllable superchargers operate. As mentioned above, the first supercharger 2 in the engine operates. During the switching process, based on the engine being at medium speed and medium load, it is determined that the operation will switch from the first supercharger 2 to the second supercharger 3. Based on the engine operating conditions being high speed and high load, it is determined that the operation will switch from the first supercharger 2 to the simultaneous operation of the first supercharger 2 and the second supercharger 3.

[0080] In some embodiments of the present invention, when the efficiency of the second turbocharger 3 is less than the efficiency of the first turbocharger 2, and the cumulative number of times the efficiency is less than the first turbocharger 2 reaches a second preset number, a switching sequence is determined. The switching sequence performed by the second turbocharger 3 includes two cases: the first is switching from the second turbocharger 3 to the first turbocharger 2, and the second is switching from the second turbocharger 3 to both the second turbocharger 3 and the first turbocharger 2. During the switching, the first or second switching sequence needs to be determined based on the engine's operating conditions. The engine includes a total of three turbochargers: one basic turbocharger 1 and two controllable turbochargers. The two controllable turbochargers are respectively the first... A supercharger 2 and a second supercharger 3 are configured such that when the engine is at low speed and low load, the basic supercharger 1 operates; when the engine is at medium speed and medium load, the basic supercharger 1 and one of the controllable superchargers operate; and when the engine is at high speed and high load, both the basic supercharger 1 and the two controllable superchargers operate. As mentioned above, the second supercharger 3 in the engine operates. During the switching process, based on the engine being at medium speed and medium load, it is determined that the operation will switch from the second supercharger 3 to the first supercharger 2. Based on the engine operating conditions being high speed and high load, it is determined that the operation will switch from the second supercharger 3 to the simultaneous operation of the second supercharger 3 and the first supercharger 2.

[0081] like Figure 7 As shown, a booster switching control system according to another embodiment of the present invention includes:

[0082] The control module is used to control the power-on of the engine's T15;

[0083] The judgment module is used to determine whether the turbocharger sequence has been switched.

[0084] The first calculation module is used to calculate the first degradation efficiency of the first turbocharger 2.

[0085] The first determining module is used to determine the switching sequence of the turbochargers based on the first degradation efficiency.

[0086] The second calculation module is used to calculate the second degradation efficiency of the second turbocharger 3.

[0087] The second determining module is used to determine the switching sequence of the turbochargers based on the second degradation efficiency.

[0088] According to the present invention, a turbocharger switching control system controls engine operation through a control module, and a judgment module is used to determine whether the turbocharger sequence has been switched during engine operation. A first calculation module and a first determination module calculate the first degradation efficiency of the first turbocharger 2 and determine whether to switch the sequence. A second calculation module and a second determination module calculate the second degradation efficiency of the second turbocharger 3 and determine whether to switch the sequence. The switching between turbochargers is performed based on the degradation efficiency, avoiding rapid wear and degradation caused by long-term use of a single turbocharger, reducing the replacement frequency of turbochargers, and extending the service life of the turbochargers.

[0089] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A control method for turbocharger switching, characterized in that, include: Power on T15, which controls the engine; Determine if the turbocharger sequence has been switched; Calculate the first degradation efficiency of the first turbocharger, assuming that the turbocharger sequence has not been switched. The order of switching turbochargers is determined based on the first preset condition that the first degradation efficiency meets the first deterioration efficiency. Calculate the second degradation efficiency of the second turbocharger based on the turbocharger sequence switching. The order of switching turbochargers is determined based on the second preset condition that the second degradation efficiency meets the second degradation efficiency. Before determining the switching order of the turbochargers based on the first degradation efficiency meeting the first preset condition, the method further includes: determining whether the efficiency of the first turbocharger is less than the efficiency of the second turbocharger based on the first degradation efficiency being greater than the first preset efficiency; The step of determining the turbocharger switching sequence based on the first preset condition being met by the first degradation efficiency includes: The order of switching turbochargers is determined based on the number of times the efficiency of the first turbocharger is less than that of the second turbocharger, which satisfies a first preset number of times. Before determining the switching order of the turbochargers based on the second degradation efficiency meeting the second preset condition, the method further includes: determining whether the efficiency of the second turbocharger is less than the efficiency of the first turbocharger based on the second degradation efficiency being greater than the second preset efficiency; The step of determining the turbocharger switching sequence based on the second preset condition being met by the second degradation efficiency includes: The order of switching turbochargers is determined based on the number of times the efficiency of the second turbocharger is less than that of the first turbocharger, which satisfies a second preset number of times. In determining the turbocharger switching sequence based on the number of times the efficiency of the second turbocharger is less than the efficiency of the first turbocharger satisfies a second preset number of times: Based on the engine's operating condition being medium speed and medium load, the first turbocharger is determined to be in operation; Based on the fact that the engine is operating at high speed and high load, it is determined that the first turbocharger and the second turbocharger are operating simultaneously. In determining the turbocharger switching sequence based on the number of times the efficiency of the first turbocharger is less than the efficiency of the second turbocharger satisfies a first preset number of times: Based on the engine's operating condition of medium speed and medium load, the second turbocharger is determined to be in operation; Based on the engine's operating conditions of high speed and high load, it is determined that the first turbocharger and the second turbocharger operate simultaneously.

2. The control method for turbocharger switching according to claim 1, characterized in that, Before calculating the first degraded efficiency of the first turbocharger based on the fact that the turbocharger sequence has not been switched, the method further includes: obtaining the standard efficiency of the first turbocharger; The calculation of the first degradation efficiency of the first turbocharger based on the fact that the turbocharger sequence has not been switched includes: Calculate the first efficiency of the first booster; The first degradation efficiency of the first turbocharger is calculated according to the formula η=(η3-η1) / η3; Wherein, η1 is the first efficiency of the first turbocharger, η3 is the standard efficiency of the first turbocharger, and η is the first deterioration efficiency.

3. The control method for turbocharger switching according to claim 2, characterized in that, Before calculating the second degraded efficiency of the second turbocharger according to the turbocharger sequence, the method further includes: obtaining the standard efficiency of the second turbocharger; The calculation of the second degradation efficiency of the second turbocharger based on the turbocharger sequence switching includes: Calculate the second efficiency of the second turbocharger; The second degradation efficiency of the second turbocharger is calculated according to the formula η=(η4-η2) / η4; Wherein, η2 is the second efficiency of the second turbocharger, η4 is the standard efficiency of the second turbocharger, and η is the second deterioration efficiency.

4. The control method for turbocharger switching according to claim 2, characterized in that, Before calculating the first efficiency of the first booster, the method further includes: obtaining the compressor inlet temperature Tin, the compressor outlet temperature Tout, the compressor outlet pressure Pout, the compressor inlet pressure Pin, and the specific heat π. The calculation of the first efficiency of the first turbocharger includes: The first efficiency is calculated using the formulas K=Pout / Pin and η1=Tin((π(K-1) / K)-1) / (Tout-Tin).

5. The control method for turbocharger switching according to claim 3, characterized in that, Before calculating the second efficiency of the second booster, the method further includes: obtaining the compressor inlet temperature Tin, the compressor outlet temperature Tout, the compressor outlet pressure Pout, the compressor inlet pressure Pin, and the specific heat π. The calculation of the second efficiency of the second turbocharger includes: The second efficiency is calculated using the formulas K=Pout / Pin and η2=Tin((π(K-1) / K)-1) / (Tout-Tin).

6. A control system for turbocharger switching, used to implement the control method for turbocharger switching as described in any one of claims 1 to 5, characterized in that, include: The control module is used to control the power-on of the engine's T15; The judgment module is used to determine whether the turbocharger sequence has been switched. A first calculation module is used to calculate the first degradation efficiency of the first turbocharger. The first determining module is used to determine the switching order of the turbochargers based on the first degradation efficiency meeting the first preset condition. The second calculation module is used to calculate the second degradation efficiency of the second turbocharger. The second determining module is used to determine the switching order of the turbochargers based on the second degradation efficiency meeting the second preset condition. Before determining the switching order of turbochargers based on the first degradation efficiency meeting the first preset condition, the method further includes: the judgment module determines whether the efficiency of the first turbocharger is less than the efficiency of the second turbocharger based on the first degradation efficiency being greater than the first preset efficiency; The first determining module is used to determine the turbocharger switching sequence based on the first degradation efficiency meeting a first preset condition, including: The first determining module determines the turbocharger switching sequence based on a first preset number of times the efficiency of the first turbocharger is less than the efficiency of the second turbocharger. Before the second determining module determines the switching order of turbochargers based on the second degradation efficiency meeting the second preset condition, the method further includes: the judging module judging whether the efficiency of the second turbocharger is less than the efficiency of the first turbocharger based on the second degradation efficiency being greater than the second preset efficiency; The second determining module is used to determine the turbocharger switching sequence based on the second degradation efficiency meeting the second preset condition, including: The second determining module is used to determine the turbocharger switching sequence based on a second preset number of times the efficiency of the second turbocharger is less than the efficiency of the first turbocharger. In determining the turbocharger switching sequence based on the number of times the efficiency of the second turbocharger is less than the efficiency of the first turbocharger satisfies a second preset number of times: The second determining module determines that the first turbocharger is operating based on the engine's operating condition being medium speed and medium load; The second determining module determines that the first turbocharger and the second turbocharger are operating simultaneously based on the engine's operating conditions of high speed and high load. In determining the turbocharger switching sequence based on the number of times the efficiency of the first turbocharger is less than the efficiency of the second turbocharger satisfies a first preset number of times: The first determining module determines that the second turbocharger is operating based on the engine's operating condition being medium speed and medium load; The first determining module determines that the first turbocharger and the second turbocharger are operating simultaneously based on the engine's operating conditions of high speed and high load.

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