A control method for supercharger protection and engine controller

Abstract

The embodiment of the present application discloses a control method for supercharger protection and is used to improve the service life of the supercharger. The embodiment of the present application method includes: when the engine is in low gear and the supercharger speed exceeds the limit value, the engine controller determines whether the current throttle change rate is greater than the threshold value; if the current throttle change rate is greater than the threshold value, a transient correction flag is established; it is determined whether the throttle opening is greater than the threshold value; if the throttle opening is greater than the threshold value, the transient correction coefficient is calibrated according to the throttle change rate and the throttle opening, and the state of the transient correction flag is maintained; the supercharger's limited oil volume is obtained according to the current ambient pressure; the transient correction coefficient and the limited oil volume are calculated to obtain the target limited oil volume; the supercharger speed is adjusted according to the target limited oil volume, and the state of the transient correction flag is exited to reduce the supercharger speed to a safe limit.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of engine control, and more particularly to a control method for supercharger protection and an engine controller. Background Art

[0002] Vehicle usage scenarios have become more diverse as people's living standards have improved. To meet usage needs, engines also need to face more application scenarios and extreme environments.

[0003] In existing technology, in plateau environments, as altitude increases, atmospheric pressure drops, the amount of air entering the diesel engine cylinder decreases, and the pressure and temperature of the mixture in the cylinder after compression decrease. This prevents the diesel injected into the cylinder from igniting and burning in time, resulting in delayed combustion, reduced power, and increased thermal load. If the circulating fuel supply remains basically unchanged, a portion of the fuel in the cylinder cannot be completely burned and produce work due to lack of oxygen, resulting in reduced power and economy and increased exhaust temperature. Therefore, when a turbocharged diesel engine operates in plateau areas, the speed of the exhaust turbocharger increases with increasing altitude due to the increase in diesel engine exhaust temperature and the decrease in turbine back pressure. Currently, the turbocharger protection MAP is calibrated to limit the fuel flow based on ambient pressure and engine speed. This means that at various altitudes and during full-throttle acceleration in high gear, the turbocharger protection limit is calibrated to limit the engine's circulating fuel output, keeping indicators such as the turbocharger speed and pre-turbine exhaust temperature within their limits. However, during low-gear acceleration, the transmission outputs high torque, allowing the engine to quickly overcome vehicle resistance. Consequently, the engine speed rises sharply, and when the fuel flow reaches approximately 80% of the turbocharger protection limit, the pre-turbine exhaust energy also rises rapidly, reaching a peak. This can easily lead to turbocharger overspeed, shortening the turbocharger's service life. Summary of the Invention

[0004] The embodiments of the present application provide a control method for supercharger protection and an engine controller, which are used to increase the service life of the supercharger.

[0005] A first aspect of the present application provides a control method for supercharger protection, comprising:

[0006] When the engine is in low gear and the supercharger speed exceeds the limit, the engine controller determines whether the current throttle change rate is greater than a threshold;

[0007] If the current throttle change rate is greater than a threshold, the engine controller establishes a transient correction flag;

[0008] The engine controller determines whether the throttle opening is greater than a threshold;

[0009] If the throttle opening is greater than a threshold, the engine controller calibrates a transient correction coefficient according to the throttle change rate and the throttle opening, and maintains the state of the transient correction flag;

[0010] The engine controller obtains a limited oil quantity of the supercharger according to the current ambient pressure;

[0011] The engine controller calculates the transient correction coefficient and the limited fuel quantity to obtain a target limited fuel quantity;

[0012] The engine controller adjusts the supercharger speed according to the target oil limit and exits the state of the transient correction flag, so that the supercharger speed drops to a safety limit.

[0013] Optionally, before the engine controller determines whether the current throttle change rate is greater than a threshold, the method further includes:

[0014] The engine controller obtains the supercharger speed of the engine;

[0015] The engine controller determines whether the supercharger speed exceeds a limit;

[0016] If the supercharger speed exceeds the limit, the engine controller reads the current vehicle gear position and determines whether the vehicle gear position is a low gear position.

[0017] Optionally, after the engine controller reads the current vehicle gear position and determines whether the vehicle gear position is a low gear position, the method further includes:

[0018] If the vehicle gear is not a low gear, the engine controller determines the restricted fuel quantity as a target restricted fuel quantity according to the ambient pressure.

[0019] Optionally, after the engine controller determines whether the current throttle change rate is greater than a threshold, the method further includes:

[0020] If the current throttle change rate is less than a threshold, the engine controller determines the restricted fuel quantity as a target restricted fuel quantity and deactivates the transient correction flag.

[0021] Optionally, after the engine controller adjusts the supercharger speed according to the target oil limit so that the supercharger speed drops to a safety limit, the method further includes:

[0022] The engine controller writes the target oil quantity limit and the transient correction coefficient into the ECU.

[0023] A second aspect of the present application provides an engine controller, characterized by comprising:

[0024] a first judgment unit, configured to judge whether a current throttle change rate is greater than a threshold when the engine is in a low gear and the supercharger speed exceeds a limit value;

[0025] an establishing unit, configured to establish a transient correction flag when the first determining unit determines that the current throttle change rate is greater than a threshold;

[0026] A second judgment unit is used to judge whether the throttle opening is greater than a threshold;

[0027] a calibration unit, configured to calibrate a transient correction coefficient according to the throttle change rate and the throttle opening, and maintain a state of the transient correction flag, when the second judgment unit determines that the throttle opening is greater than a threshold;

[0028] A first obtaining unit is used to obtain a limited oil volume of the supercharger according to the current ambient pressure;

[0029] a calculation unit, configured to calculate the transient correction coefficient and the limited fuel quantity to obtain a target limited fuel quantity;

[0030] The control unit is configured to adjust the supercharger speed according to the target oil limit and exit the state of the transient correction flag to reduce the supercharger speed to a safety limit.

[0031] Optionally, the engine controller further includes:

[0032] A second acquisition unit is used to acquire the supercharger speed of the engine;

[0033] a third judging unit, configured to judge whether the supercharger speed exceeds a limit;

[0034] The fourth judgment unit is used to read the current vehicle gear when the supercharger speed exceeds the limit value, and judge whether the vehicle gear is a low gear.

[0035] Optionally, the engine controller further includes:

[0036] The first determining unit is configured to determine the restricted fuel quantity as a target restricted fuel quantity according to the ambient pressure when the fourth determining unit determines that the gear position of the vehicle is not a low gear.

[0037] Optionally, the engine controller further includes:

[0038] The second determining unit is configured to, when the second determining unit determines that the current throttle change rate is less than a threshold value, determine the restricted fuel quantity as a target restricted fuel quantity by the engine controller, and deactivate the transient correction flag.

[0039] Optionally, the engine controller further includes:

[0040] The writing unit is used to write the target oil limit and the transient correction coefficient into the ECU.

[0041] A third aspect of the present application provides an engine controller, comprising:

[0042] Processor, memory, input and output unit, bus;

[0043] The processor is connected to the memory, the input and output unit, and the bus;

[0044] The processor specifically performs the same operations as the aforementioned first aspect.

[0045] It can be seen from the above technical solution that in the present application, when the engine controller determines that the vehicle is in a state where the supercharger speed exceeds the limit and the gear is in a low gear, the engine controller will establish a transient correction flag and use the transient correction flag as a flag to judge the throttle opening. When the throttle opening is greater than the threshold, the engine controller determines that the current vehicle is in a low-gear acceleration state, causing the supercharger to overspeed. At this time, the engine controller will obtain the transient correction coefficient based on the throttle change rate and the throttle opening, and obtain the limited oil amount required for supercharger protection, thereby calculating the transient correction coefficient and the limited oil amount, so as to achieve the purpose of controlling the engine fuel injection amount, thereby controlling the supercharger speed to decrease. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a flow chart of an embodiment of a method for controlling supercharger protection in an embodiment of the present application;

[0047] Figure 2 This is a flow chart of another embodiment of a control method for supercharger protection in an embodiment of the present application;

[0048] Figure 3 This is a schematic structural diagram of an embodiment of an engine controller in an embodiment of the present application;

[0049] Figure 4 This is a structural diagram of another embodiment of the engine controller in the embodiment of the present application;

[0050] Figure 5 This is a schematic structural diagram of another embodiment of the engine controller in the embodiment of the present application. DETAILED DESCRIPTION

[0051] The embodiments of the present application provide a control method for supercharger protection and an engine controller, which are used to increase the service life of the supercharger.

[0052] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0053] See also Figure 1 The present application provides an embodiment of a control method for supercharger protection, including:

[0054] 101. When the engine is in low gear and the supercharger speed exceeds the limit, the engine controller determines whether the current throttle change rate is greater than a threshold;

[0055] When the engine is accelerating, the transmission output torque increases, and the engine speed rises sharply. However, when the oil volume reaches approximately 80% of the supercharger protection limit, the exhaust energy before the turbine also rises rapidly to a peak value, causing the supercharger speed to exceed the limit. However, when the engine is in a low gear, the supercharger speed may also exceed the limit when the oil volume does not reach the protection limit. Therefore, the supercharger speed limit needs to be further limited when the engine is in a low gear. At this time, the engine controller will determine the current throttle change rate of the engine. The main determination content is to determine whether the current throttle change rate of the engine is greater than a threshold. The threshold refers to the threshold of the throttle change rate. The specific data is calibrated based on actual test results. The threshold will fluctuate to varying degrees for different engines. When the engine throttle change rate is greater than the current threshold, it indicates that the engine is in a low-gear emergency acceleration state and may not be in a stable operating condition. Therefore, step 102 is executed.

[0056] 102. If the current throttle change rate is greater than a threshold, the engine controller sets a transient correction flag;

[0057] After the engine controller determines that the current throttle change rate of the engine is greater than the threshold, the engine controller will establish a transient correction flag. Establishing the transient correction flag means that the transient correction flag is lit, and the corresponding engine controller will enter the control logic of the supercharger, so that the engine controller will start to obtain the required engine operating status data to correct the supercharger's oil limit.

[0058] 103. The engine controller determines whether the throttle opening is greater than a threshold;

[0059] The engine controller obtains the current throttle opening of the engine and judges the obtained throttle opening to determine whether the current throttle opening is greater than a threshold value. The threshold value is a throttle opening threshold value. In actual engine tests, the throttle opening is calibrated using test data and the calibration data is directly stored in the engine controller so that it can be directly retrieved when needed by the engine controller. When the engine controller determines that the throttle opening is greater than the threshold value, step 104 is executed.

[0060] 104. If the throttle opening is greater than a threshold, the engine controller calibrates a transient correction coefficient according to the throttle change rate and the throttle opening, and maintains the state of the transient correction flag;

[0061] The engine controller contains a MAP that determines a transient correction factor based on the throttle rate and throttle opening. This correction factor is used to dynamically adjust the fuel limit in the current supercharger protection MAP based on the throttle rate and throttle opening within a specific range.

[0062] 105. The engine controller obtains the limited oil volume of the supercharger according to the current ambient pressure;

[0063] In order to dynamically correct the limited fuel quantity, the engine controller will obtain the corresponding supercharger limited fuel quantity of the engine based on the current ambient pressure after obtaining the transient correction coefficient. The limited fuel quantity is a MAP generated by the corresponding limited fuel quantity for different ambient pressures. After the engine obtains the current ambient pressure, it can obtain the limited fuel quantity of the supercharger under the current ambient pressure through the MAP.

[0064] 106. The engine controller calculates the transient correction coefficient and the limited fuel quantity to obtain a target limited fuel quantity;

[0065] After the engine controller obtains the restricted fuel quantity and the transient correction coefficient, the engine controller multiplies the restricted fuel quantity by the transient correction coefficient. The result obtained through this calculation is the target restricted fuel quantity.

[0066] 107. The engine controller adjusts the supercharger speed according to the target oil limit and exits the state of the transient correction flag, so that the supercharger speed drops to a safety limit.

[0067] After obtaining the target limit oil quantity, the engine controller will limit the engine fuel injection quantity according to the target limit oil quantity so that the speed of the supercharger can be reduced to a safe limit.

[0068] It can be seen from the above technical solution that in the present application, when the engine controller determines that the vehicle is in a state where the supercharger speed exceeds the limit and the gear is in a low gear, the engine controller will establish a transient correction flag and use the transient correction flag as a flag to judge the throttle opening. When the throttle opening is greater than the threshold, the engine controller determines that the current vehicle is in a low-gear acceleration state, causing the supercharger to overspeed. At this time, the engine controller will obtain the transient correction coefficient based on the throttle change rate and the throttle opening, and obtain the limited oil amount required for supercharger protection, thereby calculating the transient correction coefficient and the limited oil amount, so as to achieve the purpose of controlling the engine fuel injection amount, thereby controlling the supercharger speed to decrease.

[0069] See also Figure 2 , the present application embodiment provides another embodiment of a control method for supercharger protection, including:

[0070] 201. The engine controller obtains the supercharger speed of the engine;

[0071] The engine can monitor the supercharger speed while it is running. If the supercharger speed is too fast, the supercharger's service life will be reduced, thus affecting driving safety. Therefore, after the engine obtains the supercharger speed, it will determine whether the current supercharger speed is within a safe value.

[0072] 202. The engine controller determines whether the supercharger speed exceeds a limit;

[0073] The engine controller determines the supercharger speed by using a limit value carried in the engine controller. The limit value is obtained by analyzing and calculating the feedback data of the engine during actual engine testing or of the engine of the released model. The limit value is directly stored in the engine controller, so that the engine controller can directly call the value to determine the supercharger speed. If the supercharger speed exceeds the limit value, step 203 is executed.

[0074] 203. If the supercharger speed exceeds the limit, the engine controller reads the current vehicle gear position and determines whether the vehicle gear position is a low gear position;

[0075] In actual situations, there are many situations in which the supercharger speed exceeds the limit, and in actual use, the fuel volume will be limited according to the supercharger speed limit. However, when the vehicle is in low gear, the output torque is large, which allows the engine to quickly overcome the vehicle resistance, but it will also cause the engine speed to continue to rise. When the engine speed rises sharply, the fuel injection amount will increase, resulting in the supercharger speed overspeed phenomenon. That is, when the vehicle accelerates in low gear, the fuel volume does not reach the supercharger protection limit, and the supercharger speed overspeed phenomenon also exists. Therefore, when the vehicle is in low gear, the engine controller will limit the fuel volume for correction.

[0076] 204. If the vehicle gear is not a low gear, the engine controller determines the restricted fuel quantity as a target restricted fuel quantity according to the ambient pressure.

[0077] If the vehicle is not in low gear, it means that the supercharger speed at this time can be controlled by the limited fuel value of the limited fuel MAP, and no correction is required. Therefore, the limited fuel obtained from the limited fuel MAP is directly determined as the target limited fuel.

[0078] 205. When the engine is in low gear and the supercharger speed exceeds the limit, the engine controller determines whether the current throttle change rate is greater than a threshold;

[0079] 206. If the current throttle change rate is greater than the threshold, the engine controller sets a transient correction flag;

[0080] Steps 205 to 206 in this embodiment are similar to steps 101 to 102 in the aforementioned embodiment, and are not described in detail here.

[0081] 207. If the current throttle change rate is less than a threshold, the engine controller determines the fuel limit as a target fuel limit and deactivates the transient correction flag.

[0082] When the throttle change rate is less than the threshold, it means that the current acceleration is not abnormal. The supercharger speed can be normally reduced by limiting the oil quantity, and the current engine is in a steady-state operating condition. At this time, the engine controller will determine the limited oil quantity as the target limited oil quantity and deactivate the transient correction flag.

[0083] 208. The engine controller determines whether the throttle opening is greater than a threshold;

[0084] 209. If the throttle opening is greater than a threshold, the engine controller calibrates a transient correction coefficient according to the throttle change rate and the throttle opening, and maintains the state of the transient correction flag;

[0085] 210. The engine controller obtains a limited oil quantity of the supercharger according to the current ambient pressure;

[0086] 211. The engine controller calculates the transient correction coefficient and the limited fuel quantity to obtain a target limited fuel quantity;

[0087] 212. The engine controller adjusts the supercharger speed according to the target oil limit and exits the state of the transient correction flag, so that the supercharger speed drops to a safety limit.

[0088] Steps 208 to 212 in this embodiment are similar to steps 103 to 107 in the aforementioned embodiment, and are not described in detail here.

[0089] 213. The engine controller writes the target fuel limit and the transient correction coefficient into the ECU.

[0090] After the engine controller corrects the supercharger speed, it writes the current ambient air pressure, target fuel limit, and transient correction factor into the ECU, allowing subsequent vehicles driving on the same road and encountering the same environment to directly retrieve this data.

[0091] The control method for supercharger protection in the embodiment of the present application has been described in detail above, and the engine controller will be described in detail below.

[0092] See also Figure 3 , an embodiment of the present application provides an embodiment of an engine controller, including:

[0093] The first judgment unit 301 is used to judge whether the current throttle change rate is greater than a threshold when the engine is in low gear and the supercharger speed exceeds the limit value;

[0094] An establishing unit 302 is configured to establish a transient correction flag when the first determining unit determines that the current throttle change rate is greater than a threshold;

[0095] The second judging unit 303 is used to judge whether the throttle opening is greater than a threshold;

[0096] a calibration unit 304 configured to calibrate a transient correction coefficient according to the throttle change rate and the throttle opening when the second judgment unit determines that the throttle opening is greater than a threshold, and to maintain a state of the transient correction flag;

[0097] A first obtaining unit 305 is configured to obtain a limited oil volume of the supercharger according to the current ambient pressure;

[0098] a calculation unit 306 for calculating the transient correction coefficient and the limited fuel quantity to obtain a target limited fuel quantity;

[0099] The control unit 307 is configured to adjust the supercharger speed according to the target oil limit and exit the state of the transient correction flag, so that the supercharger speed drops to a safety limit.

[0100] In this embodiment, the functions of each unit are the same as those described above. Figure 1 The steps in the illustrated embodiment correspond to each other and will not be repeated here.

[0101] See also Figure 4 , an embodiment of the present application provides an embodiment of an engine controller, including:

[0102] The second acquisition unit 401 is used to acquire the supercharger speed of the engine;

[0103] The third judgment unit 402 is used to judge whether the supercharger speed exceeds the limit;

[0104] The fourth judgment unit 403 is configured to read the current vehicle gear position when the supercharger speed exceeds the limit value, and to judge whether the vehicle gear position is a low gear position.

[0105] The first determining unit 404 is configured to determine the restricted fuel quantity as a target restricted fuel quantity according to the ambient pressure when the fourth determining unit determines that the gear position of the vehicle is not a low gear.

[0106] The first judgment unit 405 is used to judge whether the current throttle change rate is greater than a threshold when the engine is in a low gear and the supercharger speed exceeds the limit value;

[0107] An establishing unit 406 is configured to establish a transient correction flag when the first determining unit determines that the current throttle change rate is greater than a threshold;

[0108] The second judging unit 407 is used to judge whether the throttle opening is greater than a threshold;

[0109] The second determining unit 408 is configured to determine, when the second determining unit determines that the current throttle change rate is less than a threshold value, the engine controller to determine the restricted fuel quantity as a target restricted fuel quantity and to deactivate the transient correction flag.

[0110] a calibration unit 409 configured to calibrate a transient correction coefficient according to the throttle change rate and the throttle opening when the second judgment unit determines that the throttle opening is greater than a threshold, and to maintain a state of the transient correction flag;

[0111] A first obtaining unit 410 is configured to obtain a limited oil volume of the supercharger according to the current ambient pressure;

[0112] a calculation unit 411 for calculating the transient correction coefficient and the limited fuel quantity to obtain a target limited fuel quantity;

[0113] The control unit 412 is configured to adjust the supercharger speed according to the target oil limit and exit the state of the transient correction flag, so that the supercharger speed drops to a safety limit.

[0114] The writing unit 413 is configured to write the target fuel limit and the transient correction coefficient into the ECU.

[0115] In this embodiment, the functions of each unit are the same as those described above. Figure 2 The steps in the illustrated embodiment correspond to each other and will not be repeated here.

[0116] See also Figure 5 , an embodiment of the present application provides another embodiment of an engine controller, including:

[0117] Processor 501, memory 502, input and output unit 503, bus 504;

[0118] The processor 501 is connected to the memory 502, the input and output unit 503 and the bus 504;

[0119] The processor 501 specifically performs Figures 1 to 2 The operations corresponding to the steps in the method are not described in detail here.

[0120] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0121] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0122] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0123] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0124] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, read-only memory), random access memory (RAM, random access memory), disk or optical disk, and other media that can store program code.

Claims

1. A control method for supercharger protection, characterized in that: include: When the engine is in low gear and the supercharger speed exceeds the limit, the engine controller determines whether the current throttle change rate is greater than a threshold value, which is the throttle change rate threshold; If the current throttle change rate is greater than a threshold, the engine controller establishes a transient correction flag; The engine controller determines whether the throttle opening is greater than a threshold value, where the threshold value is a throttle opening threshold value; If the throttle opening is greater than a threshold, the engine controller calibrates a transient correction coefficient according to the throttle change rate and the throttle opening, and maintains the state of the transient correction flag; The engine controller obtains a limited oil quantity of the supercharger according to the current ambient pressure; The engine controller calculates the transient correction coefficient and the limited fuel quantity to obtain a target limited fuel quantity; The engine controller adjusts the supercharger speed according to the target oil limit and exits the state of the transient correction flag, so that the supercharger speed drops to a safety limit.

2. The control method according to claim 1, characterized in that: Before the engine controller determines whether the current throttle change rate is greater than a threshold, the method further includes: The engine controller obtains the supercharger speed of the engine; The engine controller determines whether the supercharger speed exceeds a limit; If the supercharger speed exceeds the limit, the engine controller reads the current vehicle gear position and determines whether the vehicle gear position is a low gear position.

3. The control method according to claim 2, characterized in that: After the engine controller reads the current vehicle gear position and determines whether the vehicle gear position is a low gear position, the method further includes: If the vehicle gear is not a low gear, the engine controller determines the restricted fuel quantity as a target restricted fuel quantity according to the ambient pressure.

4. The control method according to any one of claims 1 to 3, characterized in that: After the engine controller determines whether the current throttle change rate is greater than a threshold, the method further includes: If the current throttle change rate is less than a threshold, the engine controller determines the restricted fuel quantity as a target restricted fuel quantity and deactivates the transient correction flag.

5. The control method according to any one of claims 1 to 3, characterized in that: After the engine controller adjusts the supercharger speed according to the target oil limit so that the supercharger speed drops to a safety limit, the method further includes: The engine controller writes the target oil quantity limit and the transient correction coefficient into the ECU.

6. An engine controller, characterized in that: include: a first judgment unit, configured to judge whether a current throttle change rate is greater than a threshold value when the engine is in a low gear and the supercharger speed exceeds a limit value, the threshold value being a throttle change rate threshold value; an establishing unit, configured to establish a transient correction flag when the first determining unit determines that the current throttle change rate is greater than a threshold; A second judgment unit is used to judge whether the throttle opening is greater than a threshold value, where the threshold value is a throttle opening threshold value; a calibration unit, configured to calibrate a transient correction coefficient according to the throttle change rate and the throttle opening, and maintain a state of the transient correction flag, when the second judgment unit determines that the throttle opening is greater than a threshold; A first obtaining unit is used to obtain a limited oil volume of the supercharger according to the current ambient pressure; a calculation unit, configured to calculate the transient correction coefficient and the limited fuel quantity to obtain a target limited fuel quantity; The control unit is configured to adjust the supercharger speed according to the target oil limit and exit the state of the transient correction flag to reduce the supercharger speed to a safety limit.

7. The engine controller according to claim 6, characterized in that: The engine controller further includes: A second acquisition unit is used to acquire the supercharger speed of the engine; a third judging unit, configured to judge whether the supercharger speed exceeds a limit; The fourth judgment unit is used to read the current vehicle gear when the supercharger speed exceeds the limit value, and judge whether the vehicle gear is a low gear.

8. The engine controller according to claim 7, characterized in that: The engine controller further includes: The first determining unit is configured to determine the restricted fuel quantity as a target restricted fuel quantity according to the ambient pressure when the fourth determining unit determines that the gear position of the vehicle is not a low gear.

9. The engine controller according to any one of claims 6 to 8, characterized in that: The engine controller further includes: The second determining unit is configured to, when the first determining unit determines that the current throttle change rate is less than a threshold value, determine the restricted fuel quantity as a target restricted fuel quantity by the engine controller, and deactivate the transient correction flag.

10. The engine controller according to any one of claims 6 to 8, characterized in that: The engine controller further includes: The writing unit is used to write the target oil limit and the transient correction coefficient into the ECU.

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