Control method, control system and engine for sequential turbocharger

Abstract

The application provides a control method and system of a sequential supercharger and an engine. The control method comprises: obtaining a first temperature difference and a second temperature difference, both of which are temperature differences generated by engine oil through a first controlled supercharger, and the difference is that the first temperature difference is an actual temperature difference measured, and the second temperature difference is a theoretical temperature difference calculated. Meanwhile, the control method further comprises judging whether the first controlled supercharger fails and the failure type based on the difference between the first temperature difference and the second temperature difference, and performing failure alarm or shutting down the first controlled supercharger when the first controlled supercharger fails. It can be seen that the control method can judge whether the first controlled supercharger fails and the failure type, and when the first controlled supercharger fails, corresponding failure degradation operation is performed according to the failure type of the controlled supercharger, so that the safe and efficient operation of the engine can be effectively ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sequential turbocharger, in particular to a control method and system of sequential turbocharger and an engine comprising the control system. BACKGROUND

[0002] The sequential turbocharger technology can make the turbocharger system and the engine achieve good matching in a wide range of operation, and is considered as a mature technical measure to improve the performance of high-pressure diesel engine. Among them, the sequential turbocharger is to connect multiple turbochargers in parallel, and when the engine load increases, the turbochargers are sequentially turned on.

[0003] Because the turbocharger is in high-speed operation for a long time, the bearing is prone to wear, which leads to insufficient intake air and deteriorated engine combustion, thereby affecting the working efficiency of the engine. SUMMARY

[0004] Therefore, the present application provides a control method of a sequential turbocharger, and the scheme is as follows:

[0005] A control method of a sequential turbocharger, the sequential turbocharger comprising a basic turbocharger and at least one controlled turbocharger, wherein the basic turbocharger is turned on by default during the operation of the sequential turbocharger, and the at least one controlled turbocharger is turned on in sequence according to a setting as the engine load increases.

[0006] The at least one controlled turbocharger comprises a first controlled turbocharger, and the control method comprises:

[0007] During the operation of the sequential turbocharger, it is determined whether the first controlled turbocharger has a fault and the type of the fault of the first controlled turbocharger.

[0008] The determination of whether the first controlled turbocharger has a fault and the type of the fault of the first controlled turbocharger comprises:

[0009] A first temperature difference is obtained, the first temperature difference being a temperature difference generated by engine oil flowing through the first controlled turbocharger, and the first temperature difference being a measured temperature difference.

[0010] A second temperature difference is obtained, the second temperature difference also being a temperature difference generated by engine oil flowing through the first controlled turbocharger, and the second temperature difference being a calculated temperature difference.

[0011] A difference between the first temperature difference and the second temperature difference is obtained, and whether the first controlled turbocharger has a fault and the type of the fault of the first controlled turbocharger are determined based on the difference.

[0012] If the first controlled supercharger fails, a fault alarm is issued or the first controlled supercharger is shut down based on the fault type of the first controlled supercharger.

[0013] Optionally, obtaining the first temperature difference includes:

[0014] collecting a first engine oil temperature, where the first engine oil temperature is the temperature of the engine oil before it flows through the first controlled supercharger;

[0015] collecting a second engine oil temperature, where the second engine oil temperature is the temperature of the engine oil after it passes through the first controlled supercharger;

[0016] The first temperature difference is obtained based on a difference between the first engine oil temperature and the second engine oil temperature.

[0017] Optionally, obtaining the second temperature difference includes:

[0018] Obtain the speed N of the first controlled supercharger trb ;

[0019] Obtaining a mass flow rate m of the engine oil flowing through the first controlled supercharger;

[0020] Based on the speed N trb , the mass flow m, the friction coefficient λ of the first controlled supercharger, the friction torque M of the first controlled supercharger, and the specific heat capacity C of the engine oil to obtain the second temperature difference T;

[0021] The second temperature difference

[0022] Optionally, the difference is recorded as ΔT, and determining whether the first controlled supercharger fails and determining the type of the failure of the first controlled supercharger based on the difference ΔT includes:

[0023] If the difference ΔT is greater than 0, it is determined that the first controlled supercharger has a fault;

[0024] When the difference ΔT is greater than 0, the average value X of the difference within the preset time period t is obtained.

[0025] A fault type of the first controlled supercharger is determined based on the average value X.

[0026] Optionally, determining the fault type of the first controlled supercharger based on the average value X includes:

[0027] If the average value X is between the first preset value and the second preset value, it is determined that the first controlled supercharger is slightly worn and a fault alarm is issued;

[0028] if the average value X is greater than the second preset value, judging that the first controlled supercharger is in severe wear, and closing the first controlled supercharger;

[0029] wherein the second preset value is greater than the first preset value.

[0030] Optionally, the control method further comprises:

[0031] judging whether the basic supercharger is in failure, and judging a failure type of the basic supercharger, the failure type of the basic supercharger including light wear and moderate or severe wear;

[0032] the at least one controlled supercharger further comprises a second controlled supercharger and a third controlled supercharger, and the control method further comprises:

[0033] during the operation of the sequential superchargers, judging whether the second controlled supercharger and the third controlled supercharger are in failure, and judging a failure type of the second controlled supercharger and the third controlled supercharger, the failure type of the second controlled supercharger and the third controlled supercharger including light wear and moderate or severe wear.

[0034] Optionally, an exhaust end of the basic supercharger and the second controlled supercharger is communicated with a first side of the engine cylinder, and an exhaust end of the first controlled supercharger and the third controlled supercharger is communicated with a second side of the engine cylinder, the first side and the second side of the engine being opposite to each other; and the control method further comprises:

[0035] if the first controlled supercharger is in severe wear, closing the first controlled supercharger;

[0036] controlling the basic supercharger, the third controlled supercharger, and the second controlled supercharger to be opened in sequence;

[0037] if the second controlled supercharger is in severe wear, closing the second controlled supercharger;

[0038] controlling the basic supercharger, the first controlled supercharger, and the third controlled supercharger to be opened in sequence;

[0039] if the third controlled supercharger is in severe wear, closing the third controlled supercharger;

[0040] controlling the basic supercharger, the second controlled supercharger, and the first controlled supercharger to be opened in sequence.

[0041] Optionally, the control method further comprises:

[0042] if the basic supercharger is in severe wear, controlling the basic supercharger and the first controlled supercharger to be opened simultaneously.

[0043] A control system of a sequential supercharger, the sequential supercharger comprising: a base supercharger and at least one controlled supercharger, the base supercharger being turned on by default during operation of the sequential supercharger, and the at least one controlled supercharger being turned on in sequence according to a setting as the engine load increases; the control system comprising:

[0044] a first data processing unit, configured to obtain a first temperature difference, the first temperature difference being a temperature difference generated by engine oil flowing through the first controlled supercharger, and the first temperature difference being a measured temperature difference;

[0045] a second data processing unit, configured to obtain a second temperature difference, the second temperature difference also being a temperature difference generated by engine oil flowing through the first controlled supercharger, and the second temperature difference being a calculated temperature difference;

[0046] a third data processing unit, configured to obtain a difference between the first temperature difference and the second temperature difference, determine whether the first controlled supercharger has a fault based on the difference, and determine a fault type of the first controlled supercharger; if the first controlled supercharger has a fault, the third data processing unit is further configured to perform fault alarm or turn off the first controlled supercharger based on the fault type of the first controlled supercharger.

[0047] An engine comprising the control system of the sequential supercharger according to any one of the above embodiments.

[0048] Compared with the prior art, the technical scheme provided by the application has the beneficial effects that:

[0049] The control method provided by the application comprises: obtaining a first temperature difference and a second temperature difference, wherein the first temperature difference and the second temperature difference are both temperature differences generated by engine oil flowing through a first controlled supercharger, and the difference between the first temperature difference and the second temperature difference is that the first temperature difference is an actual temperature difference obtained by measurement, and the second temperature difference is a theoretical temperature difference obtained by calculation. After obtaining the first temperature difference and the second temperature difference, the control method further comprises determining whether the first controlled supercharger has a fault based on a difference between the first temperature difference and the second temperature difference, and determining a fault type of the first controlled supercharger, and when the first controlled supercharger has a fault, performing fault alarm or turning off the first controlled supercharger. As can be seen, the control method can determine whether the first controlled supercharger has a fault and a type of the fault, and when the first controlled supercharger has a fault, performs corresponding fault degradation operation according to the fault type of the controlled supercharger, so that the safe and efficient operation of the engine can be effectively ensured. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the technical solutions in the related art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below only illustrate the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor under the premise of the provided drawings.

[0051] The structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the present specification, to be understood and read by those skilled in the art, and do not have technical significance, so any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0052] Figure 1 It is a schematic view of the structure of a sequential supercharger;

[0053] Figure 2 It is a flow chart of a sequential supercharger control method provided by the present application;

[0054] Figure 3 It is a flow chart of another sequential supercharger control method provided by the present application;

[0055] Figure 4 It is a schematic view of the opening sequence of each supercharger when the sequential supercharger is working normally;

[0056] Figure 5 It is a schematic view of the opening sequence of each supercharger when the first controlled supercharger is closed;

[0057] Figure 6 It is a schematic view of the opening sequence of each supercharger when the second controlled supercharger is closed;

[0058] Figure 7 It is a schematic view of the opening sequence of each supercharger when the third controlled supercharger is closed;

[0059] Figure 8 It is a schematic view of the opening sequence of each supercharger when the basic supercharger is closed. DETAILED DESCRIPTION

[0060] The embodiments in the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only one regional embodiment of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0061] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0062] As mentioned in the Background Technology section, due to the long-term high-speed operation of turbochargers, bearings are prone to wear. This can lead to slow turbocharger speed, insufficient air intake, and poor engine combustion, which in turn affects engine efficiency. Therefore, it is necessary to diagnose abnormal turbocharger bearing wear and implement appropriate downgrade measures to ensure that the engine can maintain maximum power and increase reliability.

[0063] Based on this, the present application provides a control method for a sequential supercharger, such as Figure 1 As shown, the sequential supercharger includes: a basic supercharger A1 and at least one controlled supercharger 200. Specifically, during the operation of the sequential supercharger, the basic supercharger A1 is turned on by default, and as the engine load increases, the intake valve and exhaust valve of the at least one controlled supercharger are controlled so that the at least one controlled supercharger is turned on sequentially according to the settings.

[0064] The at least one controlled supercharger 200 includes a first controlled supercharger B1, on which basis, as Figure 2 As shown, Figure 2 This is a flow chart of a supercharger control method provided in this application, which includes:

[0065] S1: During the operation of the sequential supercharger, determine whether the first controlled supercharger B1 fails, and determine the type of failure of the first controlled supercharger B1.

[0066] For step S1, Figure 3 As shown, Figure 3 This is a flow chart of a supercharger control method provided in the present application. The determining whether the first controlled supercharger B1 has a fault and the determining the fault type of the first controlled supercharger B1 include:

[0067] S11: Acquire a first temperature difference, where the first temperature difference is a temperature difference generated when the engine oil flows through the first controlled supercharger B1, wherein the first temperature difference is a measured temperature difference, which is an actual temperature difference obtained by measurement;

[0068] S12: Obtain a second temperature difference, which is also the temperature difference generated by the oil flowing through the first controlled supercharger B1. The second temperature difference is a calculated temperature difference, which is a calculated theoretical temperature difference, that is, the second temperature is the temperature difference that should be generated after the oil passes through the first controlled supercharger.

[0069] S13: obtaining a difference value of the first temperature difference and the second temperature difference, judging whether the first controlled supercharger fails based on the difference value, and judging a failure type of the first controlled supercharger. That is, based on the actual temperature difference and the calculated temperature difference of the engine oil passing through the first controlled supercharger, whether the first controlled supercharger fails and the failure type of the first controlled supercharger are judged.

[0070] S14: if the first controlled supercharger fails, performing a failure alarm or shutting down the first controlled supercharger based on the failure type of the first controlled supercharger.

[0071] It should be noted that in the working process of the sequential supercharger, when the controlled supercharger is put into use, the supercharger lubrication is performed by the main oil passage engine oil, so that the heat generated by the friction of the bearing of the controlled supercharger can be taken away by the engine oil, and thus the difference between the engine oil return temperature and the engine oil temperature can represent the heat generated by the friction of the bearing of the controlled supercharger.

[0072] From the above, it can be seen that the sequential supercharger control method provided by the present application includes obtaining a first temperature difference and a second temperature difference, so that the first temperature difference can represent the actual heat generated by the friction of the bearing of the first controlled supercharger, and the second temperature difference can represent the heat that should be generated by the friction of the first controlled supercharger in theory. Therefore, the difference value obtained based on the first temperature difference and the second temperature difference is the difference between the actual temperature difference and the theoretical temperature difference, and the size of the difference value can represent whether the first controlled supercharger fails and the failure type of the failure, so that the method can determine whether the first controlled supercharger fails and the failure type of the failure based on the size of the difference value.

[0073] And from the above, if the first controlled supercharger fails, the control method further includes making a corresponding failure degradation operation according to the failure type, specifically performing a failure alarm or shutting down the first controlled supercharger. It can be seen that the control method of the sequential supercharger provided by the present application can judge whether the first controlled supercharger fails and the type of the failure, and when the first controlled supercharger fails, a corresponding operation is performed according to the failure type of the controlled supercharger, which can effectively ensure the safe and efficient operation of the engine.

[0074] For step S11, in an embodiment of the present application, the obtaining of the first temperature difference includes:

[0075] collecting a first engine oil temperature, the first engine oil temperature being a temperature before the engine oil flows through the first controlled supercharger B1.

[0076] collecting a second engine oil temperature, the second engine oil temperature being a temperature after the engine oil flows through the first controlled supercharger B1.

[0077] The first temperature difference is obtained based on the difference between the first engine oil temperature and the second engine oil temperature, so that the temperature difference generated when the engine oil flows through the first controlled supercharger can be obtained, which is a measured temperature difference and an actual temperature difference.

[0078] It should be noted that the collection of the first engine oil temperature and the second engine oil temperature can be performed by a temperature sensor or other device having a temperature collection function. The specific collection process of the first engine oil temperature and the second engine oil temperature is not limited in the present application, and is determined according to the situation.

[0079] For step S12, in an embodiment of the present application, the obtaining of the second temperature difference comprises:

[0080] Obtaining the rotating speed N of the first controlled supercharger B1 trb The rotating speed N trb may be obtained by a rotating speed sensor or other device.

[0081] Obtaining the mass flow rate m of the engine oil flowing through the first controlled supercharger B1.

[0082] The second temperature difference T is obtained based on the rotating speed N trb , the mass flow rate m, the friction coefficient λ of the first controlled supercharger, the friction torque M of the first controlled supercharger, and the specific heat capacity C of the engine oil, wherein the second temperature difference It should be noted that the friction coefficient λ of the first controlled supercharger is specifically the friction coefficient of the bearing of the first controlled supercharger B1, and the friction torque M of the first controlled supercharger is specifically the friction torque of the bearing of the first controlled supercharger B1.

[0083] Specifically, the second temperature difference T is obtained by:

[0084] Q trb =N trb ·λ·M (1)

[0085] Q out =m·C·(T out -T in ) (2)

[0086] Q trb =Q out (3)

[0087] T=T out -T in (4)

[0088] wherein Q trb is the heat generated by the bearing friction of the first controlled supercharger B1, and Qout T is the heat taken away by the engine oil when passing through the first controlled supercharger B1 out T is the engine oil return temperature, i.e., the temperature of the engine oil after passing through the first controlled supercharger B1 in T is the engine oil temperature, i.e., the temperature of the engine oil before passing through the first controlled supercharger. The influence of engine heat dissipation is not considered, Q trb = Q out Based on formulas (1), (2), (3), and (4), the following can be obtained Thus, the second temperature difference T can be obtained, and the calculated temperature difference of the engine oil passing through the first controlled supercharger B1 can be obtained.

[0089] For step S13, in an embodiment of the present application, the difference is denoted as ΔT, and the judging whether the first controlled supercharger B1 fails and judging the failure type of the first controlled supercharger B1 based on the difference ΔT includes:

[0090] If the difference ΔT is greater than 0, it indicates that there is a deviation between the measured value and the theoretical value of the temperature difference generated by the engine oil passing through the first controlled supercharger B1, and the measured value is greater than the theoretical value, and thus it indicates that the heat generated by the friction of the first controlled supercharger B1 increases, the bearing of the first controlled supercharger B1 is worn, and it is judged that the first controlled supercharger fails.

[0091] After the difference ΔT is greater than 0, an average value X of the difference in a preset time period t is obtained, In this way, the change of the difference in the preset time period t can be evaluated. It should be noted that the above-mentioned preset time period t can start timing when the difference ΔT is greater than 0, or can start timing after the difference ΔT is greater than 0, and the present application does not limit this, which is determined according to the situation.

[0092] The failure type of the first controlled supercharger B1 is judged based on the average value X, and thus the wear degree of the first controlled supercharger B1 is judged.

[0093] On the basis of the above-mentioned embodiment, in an embodiment of the present application, the judging the failure type of the first controlled supercharger based on the average value includes:

[0094] If the average value X is between a first preset value and a second preset value, it is judged that the first controlled supercharger is slightly worn, a failure alarm is given, and the driver is warned to repair the controlled supercharger.

[0095] If the average value X is greater than the second preset value, it is judged that the first controlled supercharger is severely worn and is not suitable for continuing to work, and the first controlled supercharger is closed.

[0096] The second preset value is greater than the first preset value.

[0097] From the above, the control method realizes the fault type judgment of the first controlled supercharger B1 through the actual value and the theoretical value of the temperature difference generated by the engine oil passing through the first controlled supercharger B1, which is simple in operation and intuitive in result.

[0098] The above embodiments detail the specific process of judging whether the first controlled supercharger B1 fails and judging the fault type. Correspondingly, in an embodiment of the present application, the control method further comprises:

[0099] judging whether the base supercharger A1 fails and judging the fault type of the base supercharger 200, the fault type of the base supercharger including light wear and medium-heavy wear. It should be noted that the specific process of judging whether the base supercharger A1 fails and the specific process of judging the fault type of the base supercharger are the same as the specific process of judging whether the first controlled supercharger B1 fails and the specific process of judging the fault type, which will not be repeated here.

[0100] In addition, the sequential supercharger is usually composed of a base supercharger and multiple controlled superchargers. Therefore, in the present embodiment, as shown in Figure 1 , the at least one controlled supercharger 200 further comprises a second controlled supercharger A2 and a third controlled supercharger B2. In the working process of the sequential supercharger, the base supercharger A1 is opened by default, and as the engine load increases, the first controlled supercharger B1, the second controlled supercharger A2 and the third controlled supercharger B2 are opened in turn, as shown in Figure 4 . Based on this, the control method further comprises:

[0101] judging whether the second controlled supercharger A2 and the third controlled supercharger B2 fail in the working process of the sequential supercharger, and judging the fault type of the second controlled supercharger A2 and the third controlled supercharger B2. Wherein, the fault type of the second controlled supercharger A2 and the third controlled supercharger B2 includes light wear and medium-heavy wear, that is, the fault type of the second controlled supercharger A2 includes light wear and medium-heavy wear, and the fault type of the third controlled supercharger B2 also includes light wear and medium-heavy wear.

[0102] It should be noted that in order to ensure the uniformity of engine intake, each supercharger in the sequential supercharger is usually uniformly distributed on two opposite sides of the engine cylinder. Based on this, as shown in Figure 1 , the exhaust end of the base supercharger A1 and the second controlled supercharger A2 is communicated to the first side of the engine cylinder, and the exhaust end is communicated to the second side of the engine cylinder, and the first side and the second side of the engine are opposite. The control method further comprises:

[0103] If the first controlled supercharger B1 is severely worn, the first controlled supercharger B1 is closed.

[0104] After that, the basic supercharger A1, the third controlled supercharger B2 and the second controlled supercharger A2 are sequentially opened, as shown in Figure 5

[0105] If the second controlled supercharger A2 is severely worn, the second controlled supercharger A2 is closed.

[0106] After that, the basic supercharger A1, the first controlled supercharger B1 and the third controlled supercharger B2 are sequentially opened, as shown in Figure 6

[0107] If the third controlled supercharger B2 is severely worn, the third controlled supercharger B2 is closed.

[0108] After that, the basic supercharger A1, the first controlled supercharger B1 and the second controlled supercharger A2 are sequentially opened, as shown in Figure 7

[0109] As known from the foregoing, the above embodiment details the fault degradation method when one of the plurality of controlled superchargers is severely worn, and the severely worn controlled supercharger is closed to avoid the insufficient intake air due to the ineffective work of the severely worn controlled supercharger, and further to avoid the insufficient combustion of the engine. It should be noted that, in order to match the engine with the sequential supercharger, the maximum torque of the engine is adjusted to the torque corresponding to the three superchargers when the severely worn controlled supercharger is closed. In addition, when the opening sequence of the controlled supercharger is adjusted after one controlled supercharger is closed, the superchargers on both sides of the engine cylinder are sequentially and individually opened as much as possible, specifically, one supercharger on the first side of the engine cylinder is opened, and then one supercharger on the second side of the cylinder is opened, and the superchargers are sequentially opened.

[0110] It should also be noted that when two controlled superchargers in the sequential supercharger are severely worn, or even more controlled superchargers are severely worn, the opening sequence of the controlled supercharger described above is also applicable, and the superchargers connected to the first side and the second side of the engine cylinder are sequentially and intermittently opened as much as possible.

[0111] As known from the foregoing, in the working process of the sequential supercharger, the basic supercharger A1 is in the open state by default, that is, the basic supercharger A1 is in the open state throughout the working process of the sequential supercharger, and when the basic supercharger A1 is severely worn, it cannot be closed as the controlled supercharger described above. Based on this, the control method further comprises:

[0112] ​​​If the basic supercharger A1 is severely worn, the basic supercharger A1 is controlled to be turned on at the same time as the first controlled supercharger B1, and then the second controlled supercharger A2 and the third controlled supercharger B2 are controlled to be turned on in sequence, as shown in Figure 8

[0113] Correspondingly, the application also provides a control system of a sequential supercharger, which controls the sequential supercharger by the control method of any one of the above embodiments, as shown in Figure 1 The sequential supercharger includes a basic supercharger A1 and at least one controlled supercharger 200. During the operation of the sequential supercharger, the basic supercharger A1 is turned on by default, and the at least one controlled supercharger 200 is turned on in sequence according to the setting as the engine load increases. The control system includes:

[0114] A first data processing unit is configured to obtain a first temperature difference, which is a temperature difference generated by the engine oil flowing through the first controlled supercharger B1, and the first temperature difference is a measured temperature difference.

[0115] A second data processing unit is configured to obtain a second temperature difference, which is also a temperature difference generated by the engine oil flowing through the first controlled supercharger B1, and the second temperature difference is a calculated temperature difference.

[0116] A third data processing unit is configured to obtain a difference between the first temperature difference and the second temperature difference, to determine whether the first controlled supercharger B1 fails and to determine a failure type of the first controlled supercharger B1 based on the difference. If the first controlled supercharger B1 fails, the third data processing unit further performs a failure alarm or turns off the first controlled supercharger B1 based on the failure type of the first controlled supercharger B1.

[0117] ​Specifically, as known from the above, the control system obtains the first temperature difference through the first data processing unit and obtains the second temperature difference through the second data processing unit, wherein the first temperature difference and the second temperature difference are both temperature differences generated by the engine oil through the first controlled supercharger, and the difference lies in that the first temperature difference is an actual temperature difference measured, and the second temperature difference is a theoretical temperature difference calculated, so that the first temperature difference can represent the actual heat generated by the bearing of the first controlled supercharger due to friction, and the second temperature difference can represent the heat that should be generated by the first controlled supercharger due to friction in theory. Therefore, the control system obtains the difference between the first temperature difference and the second temperature difference through the third data processing unit, and the difference is the difference between the actual temperature difference and the theoretical temperature difference, so that the size of the difference can represent whether the first controlled supercharger fails and the type of failure. Therefore, the control system can represent whether the first controlled supercharger fails and the type of failure through the size of the difference.

[0118] In addition, when the first controlled supercharger B1 fails, the control system also makes corresponding failure degradation operations according to the type of failure through the third data processing unit, specifically, failure alarm or closing the first controlled supercharger. As can be seen, the control system can determine whether the first controlled supercharger fails and the type of failure, and when the first controlled supercharger fails, the control system can make corresponding failure degradation operations according to the type of failure of the controlled supercharger, which can effectively ensure the safe and efficient operation of the engine.

[0119] Based on the above control system, the application further provides an engine, which comprises the control system described in the above embodiments.

[0120] In summary, the application provides a control method, a control system and an engine of a camera supercharger. The control method comprises: obtaining a first temperature difference and a second temperature difference, wherein the first temperature difference and the second temperature difference are both temperature differences generated by engine oil through a first controlled supercharger, and the difference lies in that the first temperature difference is an actual temperature difference measured, and the second temperature difference is a theoretical temperature difference calculated. After obtaining the first temperature difference and the second temperature difference, the control method further comprises determining whether the first controlled supercharger fails and determining the type of failure of the first controlled supercharger based on the difference between the first temperature difference and the second temperature difference, and when the first controlled supercharger fails, making failure alarm or closing the first controlled supercharger. As can be seen, the control method can determine whether the first controlled supercharger fails and the type of failure, and when the first controlled supercharger fails, the control method can make corresponding failure degradation operations according to the type of failure of the controlled supercharger, which can effectively ensure the safe and efficient operation of the engine.

[0121] Various embodiments are described in the specification in a progressive and / or concurrent manner, each embodiment emphasizing different aspects and permutations of the application. The various embodiments are presented for the purpose of simplifying the present application and teaching one skilled in the art to make and use the application. The description set forth herein, in connection with the appended drawings, describes and discloses the presently appreciated best mode of making and using the application. The terms "exemplary" and "for example" are used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" or "for example" is provided as a non-limiting example of the many different implementations of the application. Functionality described as taking place in one exemplary implementation can be performed in other implementations. Likewise, although references can be made to particular

[0122] It should be noted that in the description of the application, the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, refer to the orientation or position as shown in the drawings, and are used only for convenience in describing the application and simplifying the description, and do not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and, therefore, should not be construed or interpreted as limiting the application. When one component is said to be "connected" to another component, it can be directly connected to the other component or intervening components can be present.

[0123] It should also be noted that the terms "comprises", "comprising", or other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "comprises", "comprising", or other variations thereof, do not exclude the presence of elements other than those listed in a process, method, article, or apparatus that comprises the elements.

[0124] The above description of disclosed embodiments is intended to be illustrative and not restrictive. Many embodiments will be apparent to those of skill in the art upon reading and understanding the above description, and the applications are not limited to the embodiments described herein. Rather, the scope of the applications includes all alternatives, modifications, and equivalents falling within the scope of the claims.

Claims

1. A control method of a sequential supercharger, characterized by, The sequential supercharger comprises a basic supercharger and at least one controlled supercharger, wherein the basic supercharger is opened by default during operation of the sequential supercharger, and the at least one controlled supercharger is sequentially opened according to a setting as the engine load increases; The control method comprises the following steps of: During operation of the sequential supercharger, it is judged whether the first controlled supercharger fails and the type of failure of the first controlled supercharger is judged; The method comprises the following steps of: A first temperature difference is obtained, the first temperature difference being a temperature difference generated by engine oil flowing through the first controlled supercharger, and the first temperature difference being a measured temperature difference; A second temperature difference is obtained, the second temperature difference also being a temperature difference generated by engine oil flowing through the first controlled supercharger, and the second temperature difference being a calculated temperature difference; A difference between the first temperature difference and the second temperature difference is obtained, and whether the first controlled supercharger fails and the type of failure of the first controlled supercharger are judged based on the difference; If the first controlled supercharger fails, fault alarm or closing of the first controlled supercharger is performed based on the type of failure of the first controlled supercharger.

2. The control method of the sequential turbocharger according to claim 1, characterized by, The method comprises the following steps of: A first engine oil temperature is collected, the first engine oil temperature being a temperature before engine oil flows through the first controlled supercharger; A second engine oil temperature is collected, the second engine oil temperature being a temperature after engine oil flows through the first controlled supercharger; The first temperature difference is obtained based on a difference between the first engine oil temperature and the second engine oil temperature.

3. The control method of a sequential turbocharger according to claim 1, characterized by, The method comprises the following steps of: acquiring a rotational speed N of the first controlled supercharger trb ; A mass flow rate m of engine oil flowing through the first controlled supercharger is obtained; based on the rotational speed N trb the second temperature difference T is derived from the mass flow m, a friction coefficient λ of the first controllable supercharger, a friction torque M of the first controllable supercharger and a specific heat capacity of the oil C. the second temperature difference 4. The control method of a sequential turbocharger according to claim 1, characterized by, The difference is denoted as ΔT, and whether the first controlled supercharger fails and the type of failure of the first controlled supercharger are judged based on the difference ΔT, comprising the following steps of: If the difference ΔT is greater than 0, it is judged that the first controlled supercharger fails; when the difference AT is greater than 0, obtaining an average value X of the difference in a preset time period t, The type of failure of the first controlled supercharger is judged based on the average value X.

5. The control method of the sequential turbocharger according to claim 4, characterized by, The method comprises the following steps of: If the average value X is between a first preset value and a second preset value, it is judged that the first controlled supercharger is slightly worn, and fault alarm is performed; If the average value X is greater than the second preset value, it is judged that the first controlled supercharger is severely worn, and the first controlled supercharger is closed; The second preset value is greater than the first preset value.

6. The control method of a sequential turbocharger according to claim 1, characterized by, The control method further comprises the following steps of: It is judged whether the basic supercharger fails and the type of failure of the basic supercharger is judged, the type of failure of the basic supercharger comprising slight wear and severe wear; The at least one controlled supercharger further comprises a second controlled supercharger and a third controlled supercharger, and the control method further comprises the following steps of: In the working process of the sequential supercharger, it is determined whether the second controlled supercharger and the third controlled supercharger are faulty, and the fault type of the second controlled supercharger and the third controlled supercharger, the fault type of the second controlled supercharger and the third controlled supercharger including light wear and medium or heavy wear.

7. The control method of a sequential turbocharger according to claim 6, characterized by, The exhaust end of the base supercharger and the second controlled supercharger is communicated with a first side of the engine cylinder, and the exhaust end of the first controlled supercharger and the third controlled supercharger is communicated with a second side of the engine cylinder, the first side and the second side of the engine being opposite; the control method further comprises: If the first controlled supercharger is medium or heavy wear, the first controlled supercharger is closed; The base supercharger, the third controlled supercharger, and the second controlled supercharger are controlled to be opened in sequence; If the second controlled supercharger is medium or heavy wear, the second controlled supercharger is closed; The base supercharger, the first controlled supercharger, and the third controlled supercharger are controlled to be opened in sequence; If the third controlled supercharger is medium or heavy wear, the third controlled supercharger is closed; The base supercharger, the second controlled supercharger, and the first controlled supercharger are controlled to be opened in sequence.

8. The control method of the sequential turbocharger according to claim 7, characterized by, The control method further comprises: If the base supercharger is medium or heavy wear, the base supercharger and the first controlled supercharger are controlled to be opened at the same time.

9. A control system for a sequential turbocharger, characterized by The sequential supercharger comprises a base supercharger and at least one controlled supercharger, in the working process of the sequential supercharger, the base supercharger is opened by default, and as the engine load increases, the at least one controlled supercharger is opened in sequence according to a setting; the control system comprises: A first data processing unit, the first data processing unit is used to obtain a first temperature difference, the first temperature difference is a temperature difference generated by engine oil flowing through the first controlled supercharger, and the first temperature difference is a measured temperature difference; A second data processing unit, the second data processing unit is used to obtain a second temperature difference, the second temperature difference is also a temperature difference generated by engine oil flowing through the first controlled supercharger, and the second temperature difference is a calculated temperature difference; A third data processing unit, the third data processing unit is used to obtain a difference value of the first temperature difference and the second temperature difference, to determine whether the first controlled supercharger is faulty based on the difference value, and to determine the fault type of the first controlled supercharger; if the first controlled supercharger is faulty, the third data processing unit further performs fault alarm or closes the first controlled supercharger based on the fault type of the first controlled supercharger.

10. An engine characterized by, The engine comprises the control system of the sequential supercharger of claim 9.

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