Engine control method and related device

Abstract

The invention discloses an engine control method and a related device, and relates to the field of engines, comprising: when a vehicle is in an engine speed synchronization stage during transmission downshift, when the engine speed exceeds a target speed after downshift, and the current output torque of the engine is less than a target output torque calibration value, starting the engine to control the engine; and in the torque returning stage of the downshift process, the target output torque calibration value serves as the minimum output torque of the engine to be output, and the target output torque calibration value is determined with the engine rotating speed fluctuation amplitude in the torque returning stage as the standard. According to the method, the target output torque calibration value for reducing the engine speed fluctuation amplitude in the torque returning stage is determined, so that when the engine speed exceeds the target speed, the engine is controlled to output the torque according to the target output torque calibration value larger than the current output torque, and it is guaranteed that the engine still has large output torque in the torque returning stage; the problem that the rotating speed fluctuation of the engine is large in the torque returning stage is solved, and the user driving experience is improved.

Description

Technical Field

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

[0002] During the matching process of an Automated Mechanical Transmission (AMT) and an engine, by controlling or restricting the engine torque and engine speed, etc., the upshift and downshift operations of the transmission are realized, and the automatic shifting process of the vehicle is completed. During the engine speed synchronization stage when the transmission downshifts, to ensure the smooth completion of the transmission shift, usually the engine speed is higher than the target speed corresponding to the gear after downshifting (such as 50 - 80 r / min). Therefore, during the engine speed synchronization stage when the transmission downshifts, the control strategy for the engine speed is: a PI (Proportional-Integral) controller calculates the change amount of the engine torque demand according to the difference between the engine speed and the target speed, and adjusts the engine speed according to the change amount of the engine torque demand, so that the engine speed tends to the target speed and maintains operation at the target speed, thereby completing the closed-loop control of the engine speed.

[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 rapidly decrease. Based on the characteristic that the engine torque response is slow, especially the torque response speed of a gas engine is relatively slow, when the engine is in the torque recovery stage during the downshift process (i.e., the engine torque recovery stage), the engine torque cannot be quickly restored, resulting in a large fluctuation in the engine speed during the torque recovery stage, and the driving experience of the user is poor. Summary of the Invention

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

[0005] An engine control method includes:

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

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

[0008] If the current output torque is less than the target output torque calibration value, during the torque recovery stage of the downshift process, output the target output torque calibration value as the minimum output torque of the engine, where the target output torque calibration value is determined based on the standard of reducing the fluctuation amplitude of the engine speed during the torque recovery stage.

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

[0010] Obtaining transmission information;

[0011] Based on the transmission information, determining whether the vehicle is in the engine speed synchronization stage during transmission downshifting;

[0012] If so, obtaining the engine speed.

[0013] Optionally, if the current output torque is less than the target output torque calibration value, during the torque return stage of downshifting, using the target output torque calibration value as the minimum output torque of the engine for output, includes:

[0014] Obtaining transmission downshifting information and the average value of the engine speed fluctuation amplitude during the torque return stage before the current moment;

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

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

[0017] If so, during the torque return stage of downshifting, using the target output torque calibration value as the minimum output torque of the engine for output.

[0018] Optionally, the setting process of the corresponding relationships between different transmission downshifting information, different average values of the engine speed fluctuation amplitude, and the output torque calibration value includes:

[0019] Performing the following processing on each downshifting combination of the transmission respectively:

[0020] Based on each output torque calibration value corresponding to the downshifting combination, performing downshifting multiple times under the same vehicle operating condition, and obtaining the engine speed fluctuation amplitude during the torque return stage of downshifting;

[0021] According to the multiple engine speed fluctuation amplitudes obtained by performing downshifting multiple times based on the same output torque calibration value, obtaining the average value of the engine speed fluctuation amplitude corresponding to the same output torque calibration value, so as to obtain the average value of the engine speed fluctuation amplitude corresponding to each output torque calibration value;

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

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

[0024] Optionally, it further includes:

[0025] Based on the actual vehicle operating condition information, correct the output torque calibration values under the same vehicle operating conditions in the corresponding relationship, and use the corrected output torque calibration values to replace the output torque calibration values before correction.

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

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

[0028] Use the correction coefficients corresponding to the different parameters to correct the output torque calibration values under the same vehicle operating conditions in the corresponding relationship.

[0029] An engine control device includes:

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

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

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

[0033] A computer storage medium stores at least one instruction, and when the at least one instruction is executed by a processor, any one of the engine control methods is implemented.

[0034] An electronic device includes 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 one of the engine control methods.

[0037] As can be seen from the above technical solutions, the present invention discloses an engine control method and related device. When the vehicle is in the engine speed synchronization stage during transmission downshifting, when the engine speed exceeds the target speed after downshifting and the current output torque of the engine is less than the target output torque calibration value, during the torque return stage of the downshifting process, the target output torque calibration value is used as the minimum output torque of the engine for output. 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, when the engine speed exceeds the target speed, by controlling the engine to output torque according to the target output torque calibration value greater than the current output torque during the torque return stage, it is ensured that the engine still has a relatively large output torque during the torque return stage, so that the engine speed can smoothly approach the target speed, solving the problem of large engine speed fluctuations during the torque return stage and improving the user driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the disclosed drawings.

[0039] Figure 1 It is a flowchart of an engine control method disclosed in an embodiment of the present invention;

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

[0041] Figure 3 It is a schematic structural diagram of an electronic device disclosed in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] An embodiment of the present invention discloses an engine control method and related devices. When the vehicle is in the engine speed synchronization stage during transmission downshifting, when the engine speed exceeds the target speed after downshifting and the current output torque of the engine is less than the target output torque calibration value, during the torque return stage of the downshifting process, the target output torque calibration value is used as the minimum output torque of the engine for output. 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, when the engine speed exceeds the target speed, by controlling the engine to output torque according to the target output torque calibration value greater than the current output torque during the torque return stage, it is ensured that the engine still has a relatively large output torque during the torque return stage, so that the engine speed can smoothly approach the target speed, solving the problem of large engine speed fluctuations during the torque return stage and improving the user driving experience.

[0044] Explanation of related terms

[0045] ECU: (Electronic Control Unit) Electronic control unit, also known as "vehicle computer", "on-board computer", etc., is a special microcomputer controller for automobiles. Similar to an ordinary computer, the ECU consists of a microprocessor (Central Processing Unit, CPU), a memory, an input / output interface (I / O), an analog-to-digital converter (A / D), and large-scale integrated circuits such as shaping and driving. Among them, the memory includes: ROM (Read-Only Memory, read-only memory) and RAM (Random Access Memory, random access memory).

[0046] AMT: Automated Mechanical Transmission, automated mechanical transmission. On the basis of a manual transmission, an additional electronic control actuator is added to replace manual operation to achieve the function of automatic gear shifting. The actuator is divided into a shift actuator and a clutch actuator.

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

[0048] See Figure 1 , a flowchart of an engine control method disclosed in an embodiment of the present invention. This method is applied to the 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 during transmission downshifting refers to the stage where, during the transmission downshifting process, the engine speed is actively adjusted to match the target speed corresponding to the target gear after downshifting.

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

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

[0053] When the engine speed exceeds the target speed corresponding to the target gear after downshifting, it is necessary to adjust the engine speed so that the engine speed tends to the target speed and maintains operation at the target speed.

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

[0055] In this application, the target output torque calibration value is determined based on the standard of reducing the engine speed fluctuation amplitude during the torque return stage. When the current output torque of the engine is less than the target output torque calibration value, it means that the engine speed fluctuation during the torque return stage is relatively large. Based on this, this application directly replaces the current output torque of the engine with the target output torque calibration value to achieve a rapid recovery of the engine torque, ensure that the engine still has a relatively large output torque during the torque return stage, enable the engine speed to smoothly approach the target speed, and solve the problem of large engine speed fluctuations during the torque return stage.

[0056] In summary, the present invention discloses an engine control method. When the vehicle is in the engine speed synchronization stage during transmission downshifting, when the engine speed exceeds the target speed after downshifting and the current output torque of the engine is less than the target output torque calibration value, during the torque return stage of the downshifting process, output the target output torque calibration value as the minimum output torque of the engine, and 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 for reducing the engine speed fluctuation amplitude during the torque return stage, when the engine speed exceeds the target speed, by controlling the engine to output torque according to the target output torque calibration value greater than the current output torque during the torque return stage, it is ensured that the engine still has a relatively large output torque during the torque return stage, so that the engine speed can smoothly approach the target speed, solving the problem of large engine speed fluctuations during the torque return stage and improving the user driving experience.

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

[0058] (1). Obtain the transmission shift information.

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

[0060] The control mode status information reflects the current working strategy of the TCU, which directly affects the shift logic, torque management, and the interaction mode with the engine. By defining the shift logic, torque management strategy, and special scenario responses, it ensures an optimal balance between the engine and the transmission in terms of power transmission, fuel economy, and drivability.

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

[0062] (2). Based on the transmission shift information, determine whether the vehicle is in the engine speed synchronization stage during transmission downshifting.

[0063] For example, when the target gear position of the transmission sent by the TCU is less than the actual gear position of the transmission (such as downshifting from gear 4 to gear 3), it indicates that a downshift request has been triggered. If the actual engine speed starts to converge to the target engine speed, for example, the actual engine speed rises when downshifting from gear 4 to gear 3, it may be in the engine speed synchronization stage. At this time, combining the transmission shift information such as the control mode status information and the control engine speed information, it can finally determine whether the vehicle is in the engine speed synchronization stage during transmission downshifting.

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

[0065] Among them, if the vehicle is not in the engine speed synchronization stage during transmission 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 conversion stage before the current moment.

[0068] Among them, the transmission downshift information refers to the original gear position before transmission downshifting and the target gear position after downshifting. For example, the transmission downshifts from gear 8 to gear 7.

[0069] For example, the determination process of the average value of the engine speed fluctuation amplitude during the torsional vibration stage before the current moment can be as follows: Obtain the engine speed characteristic curve during the torsional vibration stage before the current moment, determine the engine speed fluctuation amplitude between adjacent engine speeds based on the engine speed characteristic curve, and take the average of all the engine speed fluctuation amplitudes to obtain the average value of the engine speed fluctuation amplitude.

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

[0071] Among them, the corresponding relationships between different transmission downshift information, different average values of the engine speed fluctuation amplitude, and the output torque calibration value can be seen in Table 1.

[0072] Table 1

[0073]

[0074] In Table 1, 、 、 etc. represent different average values of the engine speed fluctuation amplitude. For example, has a value of 100 r / min.

[0075] - indicates a reduction from gear to gear. - indicates a reduction from gear to . - indicates a reduction from gear to gear. - indicates a reduction from gear to gear, that is, a reduction from 2nd gear to 1st gear.

[0076] It should be noted that in Table 1, represents the highest gear, and - actually means: a reduction from the highest gear to the second highest gear.

[0077] In Table 1, the 、 、 etc. corresponding to the average value of the engine speed fluctuation amplitude and the transmission downshift represent the output torque calibration value. For example, Indicates that the average value of the engine speed fluctuation amplitude is , and the gear downshift of the transmission is - The corresponding calibrated output torque value when

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

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

[0080] (4) If so, during the torque recovery stage of the gear downshift process, use the target calibrated output torque value as the minimum output torque of the engine for output.

[0081] In this application, the target calibrated output torque value is determined based on the standard of reducing the engine speed fluctuation amplitude during the torque recovery stage. When the current output torque of the engine is less than the target calibrated output torque value, it means that the fluctuation of the engine speed during the torque recovery stage is relatively large. Based on this, this application directly replaces the current output torque of the engine with the target calibrated output torque value, realizes the rapid recovery of the engine torque, ensures that the engine still has a relatively large output torque during the torque recovery stage, enables the engine speed to smoothly approach the target speed, and solves the problem of relatively large engine speed fluctuation during the torque recovery stage.

[0082] In one embodiment, the setting process of the corresponding relationship between different transmission gear downshift information, different average values of engine speed fluctuation amplitudes, and calibrated output torque values, that is, the determination process of the values of transmission gear downshift, average value of engine speed fluctuation amplitude, and calibrated output torque value in Table 1, specifically includes:

[0083] Perform the following processing on each gear downshift combination of the transmission respectively:

[0084] (1) Based on each calibrated output torque value corresponding to the gear downshift combination, perform gear downshift multiple times under the same vehicle operating condition, and obtain the engine speed fluctuation amplitude during the torque recovery stage of the gear downshift process.

[0085] Among them, the vehicle operating condition includes: throttle opening, road surface gradient, etc.

[0086] For example, taking the downshift combination as - as an example, when the calibrated value of the output torque is , under the same vehicle operating conditions (i.e., the throttle opening and ground slope remain the same during multiple downshift operations), perform the downshift operation of the transmission from gear to gear multiple times, and obtain the engine speed fluctuation amplitude during the torque return stage of each downshift process. By averaging the multiple engine speed fluctuation amplitudes obtained with the downshift combination - and the calibrated value of the output torque being , the average value of the engine speed fluctuation amplitude is obtained.

[0087] Similarly, taking the downshift combination as - as an example, when the calibrated value of the output torque is , under the same vehicle operating conditions (i.e., the throttle opening and ground slope remain the same during multiple downshift operations), perform the downshift operation of the transmission from gear to gear multiple times, and obtain the engine speed fluctuation amplitude during the torque return stage of each downshift process. By averaging the multiple engine speed fluctuation amplitudes obtained with the downshift combination - and the calibrated value of the output torque being , the average value of the engine speed fluctuation amplitude is obtained.

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

[0089] To improve the accuracy of determining the average value of the engine speed fluctuation amplitude, it is necessary to ensure that the statistical times of the engine speed fluctuation amplitude are the same when determining the average value of the engine speed fluctuation amplitude. For example, the statistical times are both 5 times.

[0090] Among them, the downshift combination includes the original gear and the target gear, and the downshift is 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., taking - as an example, the downshift is as follows: the current gear changes from to .

[0091] In practical applications, in order to prevent the engine speed from continuing to rise during the engine speed synchronization stage when the transmission downshifts, and to avoid exceeding the allowable engine speed difference range (50 - 80 r / min), the present application sets a maximum output torque limit N max of the engine, and requires that each output torque calibration value determined in the corresponding relationship shown in Table 1 be less than the maximum output torque limit N max .

[0092] Among them, the maximum output torque limit N max needs to be less than the sum of the engine friction torque and the engine accessory torque, and the engine accessory torque includes, but is not limited to, the torques 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 working conditions, and effectively solve the problem of engine speed fluctuations during the engine downshift condition, especially during the downshift condition of a gas engine. 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, correct the output torque calibration values under the same vehicle operating condition in the corresponding relationship between different transmission downshift information, different average engine speed fluctuation amplitudes, and output torque calibration values, and use the corrected output torque calibration values to replace the output torque calibration values before correction.

[0096] Among them, the actual vehicle operating condition information may include: relevant information such as throttle opening, road surface gradient, gear position, and gear difference.

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

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

[0099] Illustrating with an example, taking the parameters of the actual vehicle operating condition information as throttle opening and vehicle weight, 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 throttle opening as r1 and the vehicle weight as m1 in the actual vehicle operating condition information as an example, the calibrated value N of the output torque min The final output value of is: N min × × 。

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

[0104] See 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 includes:

[0105] A rotational speed acquisition unit 201, configured to acquire the engine rotational speed when the vehicle is in the engine rotational speed synchronization stage during a transmission downshift.

[0106] The engine rotational speed synchronization stage during a transmission downshift refers to: during the transmission downshift process, actively adjusting the engine rotational speed to match the target rotational speed corresponding to the target gear after downshifting.

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

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

[0109] When the engine rotational speed exceeds the target rotational speed corresponding to the target gear after downshifting, it is necessary to adjust the engine rotational speed to make the engine rotational speed tend to the target rotational speed and maintain operation at the target rotational speed.

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

[0111] In this application, the calibrated value of the target output torque is determined based on the standard of reducing the fluctuation amplitude of the engine speed during the torque recovery stage. When the current output torque of the engine is less than the calibrated value of the target output torque, it means that the fluctuation of the engine speed during the torque recovery stage is relatively large. Based on this, this application directly replaces the current output torque of the engine with the calibrated value of the target output torque to quickly recover the engine torque, ensure that the engine still has a relatively large output torque during the torque recovery stage, enable the engine speed to smoothly approach the target speed, and solve the problem of relatively large fluctuation of the engine speed during the torque recovery stage.

[0112] In summary, the present invention discloses an engine control device. When the vehicle is in the case of the engine speed synchronization stage during transmission downshift, when the engine speed exceeds the target speed after downshift and the current output torque of the engine is less than the calibrated value of the target output torque, during the torque recovery stage of the downshift process, the calibrated value of the target output torque is used as the minimum output torque of the engine for output, and the calibrated value of the target output torque is determined based on the standard of reducing the fluctuation amplitude of the engine speed during the torque recovery stage. By determining the calibrated value of the target output torque for reducing the fluctuation amplitude of the engine speed during the torque recovery stage, when the engine speed exceeds the target speed, by controlling the engine to output torque according to the calibrated value of the target output torque greater than the current output torque during the torque recovery stage, it is ensured that the engine still has a relatively large output torque during the torque recovery stage, so that the engine speed can smoothly approach the target speed, solving the problem of relatively large fluctuation of the engine speed during the torque recovery stage and improving the user driving experience.

[0113] In one embodiment, the speed acquisition unit 201 can specifically be used for:

[0114] Acquire transmission information;

[0115] Based on the transmission information, determine whether the vehicle is in the engine speed synchronization stage during transmission downshift;

[0116] If so, acquire the engine speed.

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

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

[0119] Determine the calibrated value of the target output torque corresponding to both the transmission downshift information and the average value of the engine speed fluctuation amplitude from the pre-set corresponding relationships between different transmission downshift information, different average values of the engine speed fluctuation amplitude and the calibrated value of the output torque;

[0120] Judge whether the current output torque is less than the calibrated value of the target output torque;

[0121] If so, during the torque return stage of the downshift process, the calibrated target output torque value is used as the minimum output torque of the engine for output.

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

[0123] A correspondence determination unit, configured to:

[0124] Perform the following processing on each downshift combination of the transmission respectively:

[0125] Perform downshifts multiple times under the same vehicle operating condition respectively based on each calibrated output torque value corresponding to the downshift combination, and obtain the engine speed fluctuation amplitude during the torque return stage of the downshift process;

[0126] According to the multiple engine speed fluctuation amplitudes obtained by performing downshifts multiple times based on the same calibrated output torque value, obtain the average value of the engine speed fluctuation amplitudes corresponding to the same calibrated output torque value, so as to obtain the average value of the engine speed fluctuation amplitudes corresponding to each calibrated output torque value;

[0127] Wherein, the downshift combination includes the original gear and the target gear, and the downshift is that 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 calibrated output torque values in the correspondence is less than the maximum output torque limit value of the engine, and the maximum output torque limit value is less 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] A correction unit, configured to correct the calibrated output torque values under the same vehicle operating condition in the correspondence based on the actual vehicle operating condition information, and use the corrected calibrated output torque values to replace the uncorrected ones.

[0131] Wherein, the correction unit may specifically be configured to:

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

[0133] Use the correction coefficients corresponding to the different parameters to correct the calibrated output torque values under the same vehicle operating condition in the correspondence.

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

[0135] Corresponding to the above embodiments, the present invention also discloses a computer storage medium storing at least one instruction, and when the at least one instruction is executed by a processor, the steps shown in the embodiments of the engine control method are implemented.

[0136] The computer storage medium may be a tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. The computer storage medium may be a machine-readable signal medium or a machine-readable storage medium. The computer storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of the machine-readable storage medium would 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), an optical fiber, a portable compact disc 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 embodiments, as Figure 3 shown, the present invention also provides a schematic structural diagram of an electronic device, and the electronic device may include: a processor 1 and a memory 2;

[0138] Wherein, the processor 1 and the memory 2 complete mutual communication through a communication bus 3;

[0139] The processor 1 is configured to execute at least one instruction;

[0140] The memory 2 is configured to store at least one instruction;

[0141] The processor 1 may be a central processing unit (CPU), or 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 non-volatile memory, such as at least one disk memory.

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

[0144] Finally, it should also be noted that in this text, relational terms such as first and second are only used 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 "comprising", "including" or any other variant 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 expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0145] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0146] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An engine control method, characterized in that, Including: When the vehicle is in the engine speed synchronization stage during transmission downshifting, obtain the engine speed; If the engine speed exceeds the target speed corresponding to the target gear after downshifting, obtain the current output torque of the engine; If the current output torque is less than the target output torque calibration value, during the torque return stage of downshifting, output the target output torque calibration value as the minimum output torque of the engine, where the target output torque calibration value is determined based on reducing the engine speed fluctuation amplitude during the torque return stage.

2. The engine control method according to claim 1, characterized in that, The step of obtaining the engine speed when the vehicle is in the engine speed synchronization stage during transmission downshifting includes: Obtain transmission information; Based on the transmission information, determine whether the vehicle is in the engine speed synchronization stage during transmission downshifting; If so, obtain the engine speed.

3. The engine control method according to claim 1 or 2, characterized in that, The step of, if the current output torque is less than the target output torque calibration value, during the torque return stage of downshifting, output the target output torque calibration value as the minimum output torque of the engine includes: Obtain transmission downshifting information and the average value of the engine speed fluctuation amplitude during the torque return stage before the current moment; From the pre-set corresponding relationship between different transmission downshifting information, different average values of the engine speed fluctuation amplitude and output torque calibration values, determine the target output torque calibration value corresponding to both the transmission downshifting information and the average value of the engine speed fluctuation amplitude; Judge whether the current output torque is less than the target output torque calibration value; If so, during the torque return stage of downshifting, output the target output torque calibration value as the minimum output torque of the engine.

4. The engine control method according to claim 3, characterized in that, The setting process of the corresponding relationship between different transmission downshifting information, different average values of the engine speed fluctuation amplitude and output torque calibration values includes: Perform the following processing for each downshifting combination of the transmission respectively: Based on each output torque calibration value corresponding to the downshifting combination, perform downshifting multiple times under the same vehicle operating condition, and obtain the engine speed fluctuation amplitude during the torque return stage of downshifting; According to the multiple engine speed fluctuation amplitudes obtained by performing downshifting multiple times based on the same output torque calibration value, obtain the average value of the engine speed fluctuation amplitude corresponding to the same output torque calibration value, so as to obtain the average value of the engine speed fluctuation amplitude corresponding to each output torque calibration value; Wherein, the downshifting combination includes the original gear and the target gear, and the downshifting is that the current gear changes from the original gear in the downshifting combination to the target gear in the downshifting combination.

5. The engine control method according to claim 4, characterized in that, Each output torque calibration value in the corresponding relationship is less than the maximum output torque limit of the engine, and the maximum output torque limit is less than the sum of the engine friction torque and the engine accessory torque.

6. The engine control method according to any one of claims 4 or 5, characterized in that, Also including: Based on the actual vehicle operating condition information, correct the output torque calibration values under the same vehicle operating condition in the corresponding relationship, and use the corrected output torque calibration values to replace the output torque calibration values before correction.

7. The engine control method according to claim 6, characterized in that, The step of correcting the output torque calibration values under the same vehicle operating condition in the corresponding relationship based on the actual vehicle operating condition information includes: Determine the correction factors corresponding to different parameters in the actual vehicle operating condition information; Use the correction factors corresponding to the different parameters to correct the output torque calibration values under the same vehicle operating conditions in the corresponding relationship.

8. An engine control device, characterized in that, It includes: A rotational speed acquisition unit, configured to acquire the engine rotational speed when the vehicle is in the engine rotational speed synchronization stage during transmission downshifting; A torque acquisition unit, configured to acquire the current output torque of the engine if the engine rotational speed exceeds the target rotational speed corresponding to the target gear after downshifting; A torque output unit, configured to, if the current output torque is less than the target output torque calibration value, output the target output torque calibration value as the minimum output torque of the engine during the torque return stage in the downshifting process, where the target output torque calibration value is determined based on the standard of reducing the engine rotational speed fluctuation amplitude during the torque return stage.

9. 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 a processor, the engine control method according to any one of claims 1 to 7 is implemented.

10. An electronic device, characterized in that, The electronic device includes: a memory and a processor; The memory is configured 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 7.

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