Engine control method and related device

Abstract

The present invention discloses an engine control method and related devices, relating to the field of engines. The method comprises: when a vehicle is in the engine speed synchronization phase during a transmission downshift, when the engine speed exceeds the target speed after the downshift and the current output torque of the engine is less than a target output torque calibration value, the target output torque calibration value is output as the minimum output torque of the engine during the torque return phase of the downshift process. The target output torque calibration value is determined based on the standard of reducing the engine speed fluctuation amplitude during the torque return phase. By determining a target output torque calibration value that reduces the engine speed fluctuation amplitude during the torque return phase, the present invention controls the engine to output torque according to the target output torque calibration value that is greater than the current output torque when the engine speed exceeds the target speed, thereby ensuring that the engine still has a large output torque during the torque return phase. This solves the problem of large engine speed fluctuation during the torque return phase and improves the user's driving experience.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and more particularly to an engine control method and related devices. Background Art

[0002] During the matching process between the transmission (Automated Mechanical Transmission, AMT) and the engine, upshifting and downshifting are achieved by controlling or limiting engine torque and engine speed, completing the vehicle's automatic gear shifting process. During the engine speed synchronization phase during downshifting, to ensure smooth transmission shifting, the engine speed is typically higher than the target speed corresponding to the downshifted gear (e.g., 50-80 rpm). Therefore, during this phase, the engine speed control strategy is as follows: A PI (Proportional-Integral) controller calculates the change in engine torque demand based on the difference between the engine speed and the target speed. Based on this change in engine torque demand, the engine speed is adjusted to approach and maintain the target speed, thus completing closed-loop engine speed control.

[0003] According to the adjustment characteristics of the PI controller, when the engine speed exceeds the target speed, the engine torque adjusted by the PI controller will drop rapidly. Due to the slow response of the engine torque, especially the slow torque response speed of the gas engine, the engine cannot quickly recover the engine torque during the torque recovery phase (i.e., the engine torque recovery phase) during the downshift process, resulting in large fluctuations in the engine speed during the torque recovery phase, which makes the user's driving experience poor. Summary of the Invention

[0004] In view of this, the present invention discloses an engine control method and related devices to solve the problem that the engine speed fluctuates greatly during the torque recovery phase, resulting in a poor driving experience for users.

[0005] An engine control method comprising:

[0006] When the vehicle is in the engine speed synchronization stage during transmission downshifting, the engine speed is acquired;

[0007] If the engine speed exceeds the target speed corresponding to the target gear after downshifting, obtaining the current output torque of the engine;

[0008] If the current output torque is less than the target output torque calibration value, the target output torque calibration value is output as the minimum output torque of the engine during the torque return phase of the downshift process, wherein the target output torque calibration value is determined based on the engine speed fluctuation amplitude during the torque return phase.

[0009] Optionally, when the vehicle is in the engine speed synchronization stage during transmission downshifting, obtaining the engine speed includes:

[0010] Get transmission information;

[0011] determining whether the vehicle is in an engine speed synchronization phase during transmission downshifting based on the transmission information;

[0012] If so, obtain the engine speed.

[0013] Optionally, if the current output torque is less than a calibrated target output torque value, in a torque return phase of a downshift process, outputting the calibrated target output torque value as the minimum output torque of the engine includes:

[0014] Obtaining transmission downshift information and the average value of engine speed fluctuation amplitude during the torque recovery phase before the current moment;

[0015] Determining a target output torque calibration value corresponding to both the transmission downshift information and the average value of the engine speed fluctuation amplitude from preset corresponding relationships between different transmission downshift information, different engine speed fluctuation amplitude average values, and output torque calibration values;

[0016] Determining whether the current output torque is less than the target output torque calibration value;

[0017] If so, during the torque return phase of the downshift process, the target output torque calibration value is output as the minimum output torque of the engine.

[0018] Optionally, the process of setting the correspondence between different transmission downshift information, different engine speed fluctuation average values ​​and output torque calibration values ​​includes:

[0019] Each downshift combination of the transmission is processed as follows:

[0020] Downshifting is performed multiple times under the same vehicle operating condition based on each output torque calibration value corresponding to the downshift combination, and the engine speed fluctuation amplitude during the torque return phase of the downshifting process is obtained;

[0021] Obtaining an average value of the engine speed fluctuation amplitudes corresponding to the same output torque calibration value based on multiple engine speed fluctuation amplitudes obtained by performing multiple downshifts based on the same output torque calibration value, thereby obtaining an average value of the engine speed fluctuation amplitudes corresponding to each output torque calibration value;

[0022] The downshift combination includes an original gear and a target gear, and the downshift is when the current gear changes from the original gear in the downshift combination to the target gear in the downshift combination.

[0023] Optionally, each of the output torque calibration values ​​in the corresponding relationship is smaller than a maximum output torque limit of the engine, and the maximum output torque limit is smaller than a sum of an engine friction torque and an engine accessory torque.

[0024] Optionally, it also includes:

[0025] The output torque calibration value under the same vehicle operating condition in the corresponding relationship is corrected based on the actual vehicle operating condition information, and the output torque calibration value before correction is replaced by the corrected output torque calibration value.

[0026] Optionally, the correcting the output torque calibration value under the same vehicle operating condition in the corresponding relationship based on the actual vehicle operating condition information includes:

[0027] Determining correction coefficients corresponding to different parameters in the actual vehicle operating condition information;

[0028] The correction coefficients corresponding to the different parameters are used to correct the output torque calibration value under the same vehicle operating condition in the corresponding relationship.

[0029] An engine control device comprising:

[0030] A speed acquisition unit, configured to acquire the engine speed when the vehicle is in the engine speed synchronization stage during a transmission downshift;

[0031] a torque acquisition unit, configured to acquire a current output torque of the engine if the engine speed exceeds a target speed corresponding to the target gear position after downshifting;

[0032] The torque output unit is configured to output the target output torque calibration value as the minimum output torque of the engine during the torque return phase of a downshift process if the current output torque is less than the target output torque calibration value, wherein the target output torque calibration value is determined based on the engine speed fluctuation amplitude during the torque return phase.

[0033] A computer storage medium stores at least one instruction, wherein the at least one instruction is executed by a processor to implement any engine control method.

[0034] An electronic device, comprising: a memory and a processor;

[0035] The memory is used to store at least one instruction;

[0036] The processor is configured to execute the at least one instruction to implement any engine control method.

[0037] As can be seen from the above technical solutions, the present invention discloses an engine control method and related device. When a vehicle is in the engine speed synchronization stage during a transmission downshift, when the engine speed exceeds the target speed after the downshift and the current output torque of the engine is less than the target output torque calibration value, the target output torque calibration value is output as the minimum output torque of the engine during the torque return stage of the downshift process. The target output torque calibration value is determined based on the standard of reducing the engine speed fluctuation amplitude during the torque return stage. By determining the target output torque calibration value that reduces the engine speed fluctuation amplitude during the torque return stage, the present invention controls the engine to output torque according to the target output torque calibration value that is greater than the current output torque during the torque return stage when the engine speed exceeds the target speed, thereby ensuring that the engine still has a large output torque during the torque return stage, thereby allowing the engine speed to steadily approach the target speed, solving the problem of large engine speed fluctuations during the torque return stage and improving the user's driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0039] Figure 1 A flow chart of an engine control method disclosed in an embodiment of the present invention;

[0040] Figure 2 A schematic structural diagram of an engine control device disclosed in an embodiment of the present invention;

[0041] Figure 3 The figure is a schematic structural diagram of an electronic device disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] An embodiment of the present invention discloses an engine control method and related device. When a vehicle is in the engine speed synchronization phase during a transmission downshift, and the engine speed exceeds the target speed after the downshift, and the current output torque of the engine is less than a target output torque calibration value, the target output torque calibration value is output as the minimum output torque of the engine during the torque return phase of the downshift process. The target output torque calibration value is determined based on the standard of reducing the engine speed fluctuation amplitude during the torque return phase. By determining a target output torque calibration value that reduces the engine speed fluctuation amplitude during the torque return phase, the present invention controls the engine to output torque during the torque return phase according to a target output torque calibration value that is greater than the current output torque when the engine speed exceeds the target speed, thereby ensuring that the engine still has a large output torque during the torque return phase, thereby allowing the engine speed to steadily approach the target speed. This solves the problem of large engine speed fluctuations during the torque return phase and improves the user's driving experience.

[0044] Explanation of related terms

[0045] ECU: Electronic Control Unit, also known as the "driving computer" or "on-board computer," is a microcomputer controller specifically designed for automobiles. Like a regular computer, an ECU consists of a microprocessor (Central Processing Unit, CPU), memory, input / output (I / O) interfaces, an analog-to-digital converter (A / D), and large-scale integrated circuits such as those for shaping and drivers. Memory includes ROM (Read-Only Memory) and RAM (Random Access Memory).

[0046] AMT stands for Automated Mechanical Transmission. Based on a manual transmission, an electronically controlled actuator is added to replace manual operation to achieve automatic shifting. The actuators are divided into a shift selector and a clutch actuator.

[0047] TCU: Transmission Control Unit, transmission control unit.

[0048] See also Figure 1 , a flow chart of an engine control method disclosed in an embodiment of the present invention, the method is applied to an ECU, and the method includes:

[0049] Step S101: When the vehicle is in the engine speed synchronization stage during transmission downshifting, obtain the engine speed.

[0050] The engine speed synchronization stage when the transmission downshifts refers to the stage in which the engine speed is actively adjusted during the transmission downshift process to match the target speed corresponding to the target gear position after downshifting.

[0051] In practical applications, the ECU can obtain the engine speed through the crankshaft position sensor.

[0052] Step S102: If the engine speed exceeds the target speed corresponding to the target gear position after downshifting, the current output torque of the engine is obtained.

[0053] When the engine speed exceeds the target speed corresponding to the target gear after downshifting, the engine speed needs to be adjusted so that the engine speed approaches the target speed and maintains running at the target speed.

[0054] Step S103: If the current output torque is less than the target output torque calibration value, in the torque return phase of the downshift process, the target output torque calibration value is output as the minimum output torque of the engine.

[0055] The target output torque calibration value in this application is determined based on reducing the fluctuation amplitude of the engine speed during the torque return phase. When the current engine output torque is less than the target output torque calibration value, it means that the engine speed during the torque return phase is fluctuating significantly. Based on this, this application directly replaces the current engine output torque with the target output torque calibration value to achieve rapid engine torque recovery, ensuring that the engine still has a large output torque during the torque return phase, allowing the engine speed to steadily approach the target speed, and solving the problem of large engine speed fluctuations during the torque return phase.

[0056] In summary, the present invention discloses an engine control method. When a vehicle is in the engine speed synchronization phase during a transmission downshift, and the engine speed exceeds the target speed after the downshift, and the engine's current output torque is less than a target output torque calibration value, the target output torque calibration value is output as the engine's minimum output torque during the torque return phase of the downshift process. The target output torque calibration value is determined based on the standard of reducing the engine speed fluctuation amplitude during the torque return phase. By determining a target output torque calibration value that reduces the engine speed fluctuation amplitude during the torque return phase, the present invention controls the engine to output torque during the torque return phase according to a target output torque calibration value that is greater than the current output torque when the engine speed exceeds the target speed, thereby ensuring that the engine still has a large output torque during the torque return phase, thereby allowing the engine speed to steadily approach the target speed. This solves the problem of large engine speed fluctuations during the torque return phase and improves the user's driving experience.

[0057] In one embodiment, step S101 may specifically include:

[0058] (1) Obtain transmission shift information.

[0059] In this application, the ECU obtains the transmission shift information initiated by the TCU, such as the actual gear position of the transmission, the target gear position of the transmission, the control mode status information, the control speed information, etc.

[0060] Control mode status information reflects the TCU's current operating strategy, directly influencing shifting logic, torque management, and interaction with the engine. By defining shifting logic, torque management strategies, and specific scenario responses, the system ensures the optimal balance between engine and transmission power delivery, fuel economy, and drivability.

[0061] Controlling speed information is the "bridge" for collaborative control between TCU and ECU. By defining parameters such as target speed, synchronous speed, and speed difference, it ensures seamless power transmission between the engine and transmission during gear shifting.

[0062] (2) Determine whether the vehicle is in the engine speed synchronization stage when the transmission downshifts based on the transmission shift information.

[0063] For example, when the transmission target gear position sent by the TCU is lower than the actual transmission gear position (e.g., downshifting from 4th to 3rd), a downshift request has been triggered. If the actual engine speed begins to converge toward the target speed—for example, when the actual engine speed increases when downshifting from 4th to 3rd—then the vehicle may be in the engine speed synchronization phase. In this case, combined with transmission shift information such as control mode status and control speed information, it can be determined whether the vehicle is in the engine speed synchronization phase during a transmission downshift.

[0064] (3) If the vehicle is in the engine speed synchronization stage when the transmission is downshifting, obtain the engine speed.

[0065] If the vehicle is not in the engine speed synchronization stage when the transmission is downshifting, the engine speed is not obtained.

[0066] In one embodiment, step S103 may specifically include:

[0067] (1) Obtain the transmission downshift information and the average value of the engine speed fluctuation amplitude during the torque recovery phase before the current moment.

[0068] The transmission downshift information refers to the original gear position before the transmission downshifts and the target gear position after the transmission downshifts, for example, the transmission downshifts from 8 gears to 7 gears.

[0069] For example, the process of determining the average value of the engine speed fluctuation amplitude during the torque recovery stage before the current moment can be: obtaining the engine speed characteristic curve diagram during the torque recovery stage before the current moment, determining the engine speed fluctuation amplitude between adjacent engine speeds based on the engine speed characteristic curve diagram, averaging all engine speed fluctuation amplitudes, and obtaining the average value of the engine speed fluctuation amplitude.

[0070] (2) From the pre-set correspondence between different transmission downshift information, different engine speed fluctuation amplitude average values ​​and output torque calibration values, determine the target output torque calibration value corresponding to both the transmission downshift information and the engine speed fluctuation amplitude average value.

[0071] The corresponding relationships between different transmission downshift information, different engine speed fluctuation average values ​​and output torque calibration values ​​can be seen in Table 1.

[0072] Table 1

[0073]

[0074] In Table 1, 、 、 etc. represent different average values ​​of engine speed fluctuation amplitudes, for example, The value is 100r / min.

[0075] - Indicated by Gear down to block, - Indicated by Gear down to , - Indicated by Gear down to block, - Indicated by Gear down to gear, that is, reduced from 2nd gear to 1st gear.

[0076] It should be noted that in Table 1, Indicates the highest gear. - It actually means: reducing from the highest gear to the second highest gear.

[0077] Table 1 The average value of engine speed fluctuation and the corresponding value of transmission downshift 、 、 etc., indicating the output torque calibration value, for example, Indicates that the average value of the engine speed fluctuation is , and the transmission downshifts to - The corresponding output torque calibration value.

[0078] It should be noted that Table 1 shows the correspondence between different transmission downshift information, different average values ​​of engine speed fluctuation amplitudes, and output torque calibration values. In actual applications, the corresponding relationship shown in Table 1 can be used to determine the respective values ​​of different transmission downshift information, different average values ​​of engine speed fluctuation amplitudes, and output torque calibration values ​​through experiments, etc., so as to determine the target output torque calibration value corresponding to both the transmission downshift information and the average value of engine speed fluctuation amplitude in actual applications. For example, if the transmission downshift information is: 8 gear to 7 gear, and the average value of engine speed fluctuation amplitude is 120r / min, then N min The value can be selected as 30Nm.

[0079] (3) Determine whether the current output torque is less than the target output torque calibration value.

[0080] (4) If yes, in the torque return phase of the downshift process, the target output torque calibration value is output as the minimum output torque of the engine.

[0081] The target output torque calibration value in this application is determined based on reducing the fluctuation amplitude of the engine speed during the torque return phase. When the current engine output torque is less than the target output torque calibration value, it means that the engine speed during the torque return phase is fluctuating significantly. Based on this, this application directly replaces the current engine output torque with the target output torque calibration value to achieve rapid engine torque recovery, ensuring that the engine still has a large output torque during the torque return phase, allowing the engine speed to steadily approach the target speed, and solving the problem of large engine speed fluctuations during the torque return phase.

[0082] In one embodiment, the process of setting the correspondence between different transmission downshift information, different engine speed fluctuation amplitude averages, and output torque calibration values, that is, the process of determining the values ​​of the transmission downshift, engine speed fluctuation amplitude averages, and output torque calibration values ​​in Table 1, specifically includes:

[0083] Each downshift combination of the transmission is processed as follows:

[0084] (1) Downshifting is performed multiple times under the same vehicle operating condition based on each output torque calibration value corresponding to the downshift combination, and the engine speed fluctuation amplitude during the torque recovery stage of the downshifting process is obtained.

[0085] Among them, vehicle operating conditions include: throttle opening, road slope, etc.

[0086] For example, take the downshift combination as - For example, when the output torque calibration value is When the vehicle is in the same operating condition (i.e. the throttle opening and the ground slope are kept consistent during multiple downshift operations), the transmission is repeatedly Gear down to The downshift operation of the gear is calculated, and the engine speed fluctuation amplitude during the torque recovery stage of each downshift process is obtained. - The output torque calibration value is The obtained multiple engine speed fluctuation amplitudes are averaged to obtain the average engine speed fluctuation amplitude .

[0087] Similarly, the downshift combination is - For example, when the output torque calibration value is When the vehicle is in the same operating condition (i.e. the throttle opening and the ground slope are kept consistent during multiple downshift operations), the transmission is repeatedly Gear down to The downshift operation of the gear is calculated, and the engine speed fluctuation amplitude during the torque recovery stage of each downshift process is obtained. - The output torque calibration value is The obtained multiple engine speed fluctuation amplitudes are averaged to obtain the average engine speed fluctuation amplitude .

[0088] (2) Based on multiple engine speed fluctuation amplitudes obtained by multiple downshifts based on the same output torque calibration value, an average value of the engine speed fluctuation amplitude corresponding to the same output torque calibration value is obtained, so as to obtain an average value of the engine speed fluctuation amplitude corresponding to each output torque calibration value.

[0089] In order to improve the accuracy of determining the average value of the engine speed fluctuation amplitude, it is necessary to ensure that the engine speed fluctuation amplitude is counted the same number of times when determining the average value of the engine speed fluctuation amplitude, for example, the number of counts is always 5.

[0090] The downshift combination includes an original gear and a target gear, and downshifting means that the current gear changes from the original gear in the downshift combination to the target gear in the downshift combination. For example, the downshift combinations shown in Table 1 include: - 、 - 、 - 、 - etc. - For example, downshift is: the current gear is becomes .

[0091] In actual application, in order to prevent the engine speed from continuing to rise during the engine speed synchronization phase when the transmission is downshifted and exceeding the allowable engine speed difference range (50-80r / min), this application sets the maximum output torque limit of the engine N max , it is required that each output torque calibration value determined in the corresponding relationship shown in Table 1 is less than the maximum output torque limit N max .

[0092] Among them, the maximum output torque limit N max It needs to be smaller than the sum of the engine friction torque and the engine accessory torque, where the engine accessory torque includes but is not limited to the torque of the air conditioner, fan, etc.

[0093] To improve the accuracy of the output torque calibration values ​​in Table 1, ensure that the engine control method is applicable to various operating conditions, and effectively solve the problem of engine speed fluctuation during engine downshift conditions, especially during gas engine downshift conditions, the present invention can also correct the output torque calibration values.

[0094] Therefore, the engine control method may further include:

[0095] Based on the actual vehicle operating condition information, the output torque calibration value under the same vehicle operating condition in the correspondence between different transmission downshift information, different engine speed fluctuation average values ​​and output torque calibration values ​​is corrected, and the corrected output torque calibration value is used to replace the output torque calibration value before correction.

[0096] The actual vehicle operating condition information may include: throttle opening, road slope, gear position, gear position difference and other related information.

[0097] Specifically, determining correction coefficients corresponding to different parameters in actual vehicle operating condition information;

[0098] The correction coefficients corresponding to the different parameters are used to correct the output torque calibration value under the same vehicle operating condition in the corresponding relationship between different transmission downshift information, different engine speed fluctuation average values ​​and the output torque calibration value.

[0099] For example, taking the parameters of the actual vehicle operating condition information as throttle opening and vehicle weight as an example, the correction coefficients corresponding to the throttle opening and vehicle weight are shown in Table 2.

[0100] Table 2

[0101]

[0102] In Table 2, the throttle opening corresponds to the first correction coefficient, and the vehicle weight corresponds to the second correction coefficient. Taking the actual vehicle operating condition information, the throttle opening is r1 and the vehicle weight is m1 as an example, the output torque calibration value N min The final output value is: N min × × .

[0103] Corresponding to the above method embodiment, the present invention also discloses an engine control device.

[0104] See also Figure 2 , a schematic structural diagram of an engine control device disclosed in an embodiment of the present invention, the device is applied to an ECU, and the device includes:

[0105] The speed acquisition unit 201 is used to acquire the engine speed when the vehicle is in the engine speed synchronization stage when the transmission is downshifting.

[0106] The engine speed synchronization stage when the transmission downshifts refers to the stage in which the engine speed is actively adjusted during the transmission downshift process to match the target speed corresponding to the target gear position after downshifting.

[0107] In practical applications, the ECU can obtain the engine speed through the crankshaft position sensor.

[0108] The torque acquisition unit 202 is configured to acquire the current output torque of the engine if the engine speed exceeds the target speed corresponding to the target gear position after downshifting.

[0109] When the engine speed exceeds the target speed corresponding to the target gear after downshifting, the engine speed needs to be adjusted so that the engine speed approaches the target speed and maintains running at the target speed.

[0110] The torque output unit 203 is configured to output the target output torque calibration value as the minimum output torque of the engine during a torque return phase of a downshift process if the current output torque is less than the target output torque calibration value.

[0111] The target output torque calibration value in this application is determined based on reducing the fluctuation amplitude of the engine speed during the torque return phase. When the current engine output torque is less than the target output torque calibration value, it means that the engine speed during the torque return phase is fluctuating significantly. Based on this, this application directly replaces the current engine output torque with the target output torque calibration value to achieve rapid engine torque recovery, ensuring that the engine still has a large output torque during the torque return phase, allowing the engine speed to steadily approach the target speed, and solving the problem of large engine speed fluctuations during the torque return phase.

[0112] In summary, the present invention discloses an engine control device. When a vehicle is in the engine speed synchronization phase during a transmission downshift, and the engine speed exceeds the target speed after the downshift, and the engine's current output torque is less than a target output torque calibration value, the target output torque calibration value is output as the engine's minimum output torque during the torque return phase of the downshift process. The target output torque calibration value is determined based on the standard of reducing the engine speed fluctuation amplitude during the torque return phase. By determining a target output torque calibration value that reduces the engine speed fluctuation amplitude during the torque return phase, the present invention controls the engine to output torque during the torque return phase according to a target output torque calibration value that is greater than the current output torque when the engine speed exceeds the target speed, thereby ensuring that the engine still has a large output torque during the torque return phase. This allows the engine speed to steadily approach the target speed, thereby resolving the problem of large engine speed fluctuations during the torque return phase and improving the user's driving experience.

[0113] In one embodiment, the speed acquisition unit 201 may be specifically configured to:

[0114] Get transmission information;

[0115] determining whether the vehicle is in an engine speed synchronization phase during transmission downshifting based on the transmission information;

[0116] If so, obtain the engine speed.

[0117] In one embodiment, the torque output unit 203 may be specifically used to:

[0118] Obtaining transmission downshift information and the average value of engine speed fluctuation amplitude during the torque recovery phase before the current moment;

[0119] Determining a target output torque calibration value corresponding to both the transmission downshift information and the average value of the engine speed fluctuation amplitude from preset corresponding relationships between different transmission downshift information, different engine speed fluctuation amplitude average values, and output torque calibration values;

[0120] Determining whether the current output torque is less than the target output torque calibration value;

[0121] If so, during the torque return phase of the downshift process, the target output torque calibration value is output as the minimum output torque of the engine.

[0122] In one embodiment, the engine control may further include:

[0123] The corresponding relationship determining unit is configured to:

[0124] Each downshift combination of the transmission is processed as follows:

[0125] Downshifting is performed multiple times under the same vehicle operating condition based on each output torque calibration value corresponding to the downshift combination, and the engine speed fluctuation amplitude during the torque return phase of the downshifting process is obtained;

[0126] Obtaining an average value of the engine speed fluctuation amplitudes corresponding to the same output torque calibration value based on multiple engine speed fluctuation amplitudes obtained by performing multiple downshifts based on the same output torque calibration value, thereby obtaining an average value of the engine speed fluctuation amplitudes corresponding to each output torque calibration value;

[0127] The downshift combination includes an original gear and a target gear, and the downshift is when the current gear changes from the original gear in the downshift combination to the target gear in the downshift combination.

[0128] It should be noted that each of the output torque calibration values ​​in the corresponding relationship is smaller than the maximum output torque limit of the engine, and the maximum output torque limit is smaller than the sum of the engine friction torque and the engine accessory torque.

[0129] In one embodiment, the engine control device may further include:

[0130] The correction unit is used to correct the output torque calibration value under the same vehicle operating condition in the corresponding relationship based on the actual vehicle operating condition information, and replace the output torque calibration value before correction with the corrected output torque calibration value.

[0131] The correction unit can be used to:

[0132] Determining correction coefficients corresponding to different parameters in the actual vehicle operating condition information;

[0133] The correction coefficients corresponding to the different parameters are used to correct the output torque calibration value under the same vehicle operating condition in the corresponding relationship.

[0134] It should be noted that, for the specific working principles of the various components in the device embodiment, please refer to the corresponding part of the method embodiment, which will not be repeated here.

[0135] Corresponding to the above embodiment, the present invention further discloses a computer storage medium, which stores at least one instruction. When the at least one instruction is executed by a processor, the steps shown in the engine control method embodiment are implemented.

[0136] A computer storage medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer storage medium may be a machine-readable signal medium or a machine-readable storage medium. A computer storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of machine-readable storage media may include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0137] Corresponding to the above embodiment, Figure 3 As shown, the present invention also provides a structural diagram of an electronic device, which may include: a processor 1 and a memory 2;

[0138] The processor 1 and the memory 2 communicate with each other via a communication bus 3.

[0139] Processor 1, configured to execute at least one instruction;

[0140] Memory 2, used to store at least one instruction;

[0141] The processor 1 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.

[0142] The memory 2 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0143] The processor executes at least one instruction to implement the steps shown in the embodiment of the engine control method.

[0144] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0145] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0146] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An engine control method, characterized in that: include: When the vehicle is in the engine speed synchronization stage during transmission downshifting, the engine speed is acquired; If the engine speed exceeds the target speed corresponding to the target gear after downshifting, obtaining the current output torque of the engine; If the current output torque is less than the target output torque calibration value, in the torque return phase of the downshift process, the target output torque calibration value is output as the minimum output torque of the engine, specifically including: Obtaining transmission downshift information and the average value of engine speed fluctuation amplitude during the torque recovery phase before the current moment; Determining a target output torque calibration value corresponding to both the transmission downshift information and the average value of the engine speed fluctuation amplitude from preset corresponding relationships between different transmission downshift information, different engine speed fluctuation amplitude average values, and output torque calibration values; Determining whether the current output torque is less than the target output torque calibration value; If yes, in the torque return phase of the downshift process, the target output torque calibration value is output as the minimum output torque of the engine; The target output torque calibration value is determined based on the engine speed fluctuation amplitude during the torque reduction phase.

2. The engine control method according to claim 1, characterized in that: The obtaining of the engine speed when the vehicle is in the engine speed synchronization stage during transmission downshifting includes: Get transmission information; determining whether the vehicle is in an engine speed synchronization phase during transmission downshifting based on the transmission information; If so, obtain the engine speed.

3. The engine control method according to claim 1, wherein: The process of setting the corresponding relationship between different transmission downshift information, different engine speed fluctuation average values ​​and output torque calibration values ​​includes: Each downshift combination of the transmission is processed as follows: Downshifting is performed multiple times under the same vehicle operating condition based on each output torque calibration value corresponding to the downshift combination, and the engine speed fluctuation amplitude during the torque return phase of the downshifting process is obtained; Obtaining an average value of the engine speed fluctuation amplitudes corresponding to the same output torque calibration value based on multiple engine speed fluctuation amplitudes obtained by performing multiple downshifts based on the same output torque calibration value, thereby obtaining an average value of the engine speed fluctuation amplitudes corresponding to each output torque calibration value; The downshift combination includes an original gear and a target gear, and the downshift is when the current gear changes from the original gear in the downshift combination to the target gear in the downshift combination.

4. The engine control method according to claim 3, characterized in that: Each of the output torque calibration values ​​in the corresponding relationship is less than a maximum output torque limit of the engine, and the maximum output torque limit is less than a sum of an engine friction torque and an engine accessory torque.

5. The engine control method according to any one of claims 3 or 4, characterized in that: Also includes: The output torque calibration value under the same vehicle operating condition in the corresponding relationship is corrected based on the actual vehicle operating condition information, and the output torque calibration value before correction is replaced by the corrected output torque calibration value.

6. The engine control method according to claim 5, characterized in that: The correcting the output torque calibration value under the same vehicle operating condition in the corresponding relationship based on the actual vehicle operating condition information includes: Determining correction coefficients corresponding to different parameters in the actual vehicle operating condition information; The correction coefficients corresponding to the different parameters are used to correct the output torque calibration value under the same vehicle operating condition in the corresponding relationship.

7. An engine control device, characterized in that: include: A speed acquisition unit, configured to acquire the engine speed when the vehicle is in the engine speed synchronization stage during a transmission downshift; a torque acquisition unit, configured to acquire a current output torque of the engine if the engine speed exceeds a target speed corresponding to the target gear position after downshifting; a torque output unit, configured to output the target output torque calibration value as the minimum output torque of the engine during a torque return phase of a downshift process if the current output torque is less than a target output torque calibration value, wherein the target output torque calibration value is determined based on a fluctuation amplitude of the engine speed during the torque return phase; The torque output unit is further used for: Obtaining transmission downshift information and the average value of engine speed fluctuation amplitude during the torque recovery phase before the current moment; Determining a target output torque calibration value corresponding to both the transmission downshift information and the average value of the engine speed fluctuation amplitude from preset corresponding relationships between different transmission downshift information, different engine speed fluctuation amplitude average values, and output torque calibration values; Determining whether the current output torque is less than the target output torque calibration value; If so, during the torque return phase of the downshift process, the target output torque calibration value is output as the minimum output torque of the engine.

8. A computer storage medium, characterized in that The computer storage medium stores at least one instruction, and when the at least one instruction is executed by the processor, the engine control method according to any one of claims 1 to 6 is implemented.

9. An electronic device, characterized in that: The electronic device includes: a memory and a processor; The memory is used to store at least one instruction; The processor is configured to execute the at least one instruction to implement the engine control method according to any one of claims 1 to 6.

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