Engine speed control method, device, storage medium and apparatus

Abstract

The present invention belongs to the technical field of vehicles, and discloses an engine speed control method, device, storage medium and apparatus. When the target vehicle is in a series power generation mode and a brake pedal signal is detected, the motor recovery torque corresponding to the target motor of the target vehicle is obtained; it is judged whether the engine speed needs to be compensated according to the motor recovery torque and a preset mount torque, and a judgment result is obtained; the target engine speed is determined according to the judgment result and a preset booming frequency, and the rotation of the target engine is controlled according to the target engine speed. Compared with the existing brake booming adjustment scheme with high hardware change cost and long development and verification cycle, the present invention, without changing the hardware, monitors the motor recovery torque corresponding to the target motor in real time and dynamically adjusts the engine speed to avoid the booming frequency of the whole vehicle, and completely solves the problem of vehicle brake booming.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular, to an engine speed control method, device, storage medium and apparatus. Background Art

[0002] With the development of automotive technology, more and more users choose to use hybrid vehicles for daily use. The P1+P3 motor architecture is the most mainstream motor configuration of hybrid vehicles at present, which can achieve pure electric mode, series mode, parallel mode, cruise direct drive, and regenerative braking. Therefore, while ensuring power performance, it also has excellent fuel economy. However, its configuration and control logic are complex, bringing many new NVH problems, and brake roar is one of the main NVH problems. The conventional method to solve this problem in the existing solutions is to adjust the mount performance and improve its vibration isolation level under braking conditions. However, due to the high cost of changing hardware and the long development and verification cycle, the vehicle production efficiency is low. Summary of the Invention

[0003] The main object of the present invention is to provide an engine speed control method, device, storage medium and apparatus, aiming to solve the technical problem of high cost of changing hardware and long development and verification cycle in the existing brake roar adjustment solutions.

[0004] To achieve the above object, the present invention provides an engine speed control method, and the engine speed control method includes the following steps:

[0005] When the target vehicle is in the series power generation mode and a brake pedal signal is detected, obtain the motor recovery torque corresponding to the target motor of the target vehicle;

[0006] Judge whether it is necessary to compensate the engine speed according to the motor recovery torque and the preset mount torque, and obtain a judgment result;

[0007] Determine the target engine speed according to the judgment result and the preset roar frequency, and control the rotation of the target engine according to the target engine speed.

[0008] Optionally, the step of when the target vehicle is in the series power generation mode and a brake pedal signal is detected, obtaining the motor recovery torque corresponding to the target motor of the target vehicle includes:

[0009] When the target vehicle is in the series power generation mode and a brake pedal signal is detected, obtain the brake pedal information and the battery information;

[0010] Determine the motor recovery torque according to the brake pedal information and the battery information.

[0011] Optionally, the step of determining the motor regeneration torque according to the brake pedal information and the battery information includes:

[0012] Obtain the displacement information and the speed of stepping on the brake pedal from the brake pedal information;

[0013] Obtain the SOC value and the battery pack temperature from the battery information;

[0014] Determine the motor regeneration torque according to the displacement information, the speed of stepping on the brake pedal, the SOC value, the battery pack temperature, and the current vehicle speed information.

[0015] Optionally, the step of determining the motor regeneration torque according to the displacement information, the speed of stepping on the brake pedal, the SOC value, the battery pack temperature, and the current vehicle speed information includes:

[0016] Determine the electric braking force and the mechanical braking force according to the displacement information, the speed of stepping on the brake pedal, the SOC value, the battery pack temperature, and the current vehicle speed information;

[0017] Determine the motor regeneration torque according to the electric braking force and the mechanical braking force.

[0018] Optionally, the step of determining whether to compensate the engine speed according to the motor regeneration torque and the preset mount torque to obtain a judgment result includes:

[0019] If the motor regeneration torque is not less than the preset mount torque, it is determined that the engine speed needs to be compensated;

[0020] If the motor regeneration torque is less than the preset mount torque, it is determined that the engine speed does not need to be compensated.

[0021] Optionally, the step of determining the target engine speed according to the judgment result and the preset booming frequency, and controlling the rotation of the target engine according to the target engine speed includes:

[0022] When it is determined that the engine speed needs to be compensated, determine the engine speed value to be adjusted according to the engine speed range corresponding to the preset vehicle booming frequency;

[0023] Determine the target engine speed according to the engine speed value to be adjusted and the current engine speed;

[0024] Control the rotation of the engine according to the target engine speed.

[0025] Optionally, the engine speed range corresponding to the preset booming frequency is determined by the following formula:

[0026] where ΔEngSpd Booming is the engine speed range corresponding to the roar, and f Booming is the preset roar frequency.

[0027] In addition, to achieve the above object, the present invention also provides an engine speed control device. The engine speed control device includes a memory, a processor, and an engine speed control program stored on the memory and executable on the processor. The engine speed control program is configured to implement the steps of the engine speed control as described above.

[0028] In addition, to achieve the above object, the present invention also provides a storage medium. An engine speed control program is stored on the storage medium. When the engine speed control program is executed by a processor, the steps of the engine speed control method as described above are implemented.

[0029] In addition, to achieve the above object, the present invention also provides an engine speed control apparatus, the engine speed control apparatus includes:

[0030] a torque determination module, configured to obtain the motor recovery torque corresponding to the target motor of the target vehicle when the target vehicle is in a series power generation mode and a brake pedal signal is detected;

[0031] a compensation judgment module, configured to judge whether engine speed compensation is required according to the motor recovery torque and a preset mount torque, and obtain a judgment result;

[0032] a speed adjustment module, configured to determine a target engine speed according to the judgment result and a preset roar frequency, and control the rotation of the target engine according to the target engine speed.

[0033] According to the present invention, when the target vehicle is in a series power generation mode and a brake pedal signal is detected, the motor recovery torque corresponding to the target motor of the target vehicle is obtained; it is judged whether engine speed compensation is required according to the motor recovery torque and a preset mount torque, and a judgment result is obtained; a target engine speed is determined according to the judgment result and a preset roar frequency, and the rotation of the target engine is controlled according to the target engine speed. Compared with the existing brake roar adjustment scheme, where changing the hardware has a high cost and a long development and verification cycle, the present invention, without changing the hardware, monitors the motor recovery torque corresponding to the target motor in real time and dynamically adjusts the engine speed to avoid the vehicle roar frequency, completely solving the vehicle brake roar problem. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of an engine speed control device in a hardware operating environment according to an embodiment of the present invention;

[0035] Figure 2 Schematic flowchart of the first embodiment of the engine speed control method of the present invention;

[0036] Figure 3 Schematic diagram of the P1+P3 electric drive architecture of a hybrid vehicle and its vehicle layout in the first embodiment of the engine speed control method of the present invention;

[0037] Figure 4 Optimized flowchart of the hybrid vehicle braking roar control in the first embodiment of the engine speed control method of the present invention;

[0038] Figure 5 Schematic flowchart of the second embodiment of the engine speed control method of the present invention;

[0039] Figure 6 Block diagram of the structure of the first embodiment of the engine speed control device of the present invention.

[0040] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed embodiments

[0041] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] Refer to Figure 1 , Figure 1 Schematic diagram of the structure of the engine speed control device in the hardware operating environment related to the embodiment solution of the present invention.

[0043] As Figure 1 shown, the engine speed control device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), and optionally the user interface 1003 may further include a standard wired interface and a wireless interface. The wired interface of the user interface 1003 may be a USB interface in the present invention. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless-fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM), or a stable memory (Non-volatile Memory, NVM), such as a disk memory. The memory 1005 may optionally be a storage device independent of the foregoing processor 1001.

[0044] Those skilled in the art can understand that Figure 1 the structure shown in Figure 1 does not constitute a limitation on the engine speed control device, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0045] As Figure 1 shown, the memory 1005 identified as a data processing and storage medium may include an operating system, a network communication module, a user interface module, and an engine speed control program.

[0046] In Figure 1 the engine speed control device shown, the network interface 1004 is mainly used to connect to the background server and perform data communication with the background server; the user interface 1003 is mainly used to connect to the user device; the engine speed control device calls the engine speed control program stored in the memory 1005 through the processor 1001 and executes the engine speed control method provided in the embodiment of the present invention.

[0047] Based on the above hardware structure, an embodiment of the engine speed control method of the present invention is proposed.

[0048] Referring to Figure 2 , Figure 2 which is a schematic flowchart of the first embodiment of the engine speed control method of the present invention, the first embodiment of the engine speed control method of the present invention is proposed.

[0049] In this embodiment, the engine speed control method includes the following steps:

[0050] Step S10: When the target vehicle is in the series power generation mode and a brake pedal signal is detected, obtain the motor recovery torque corresponding to the target motor of the target vehicle.

[0051] It should be noted that the execution subject in this embodiment may be a device including an engine speed regulation system, such as: an on-vehicle computer, a computer, a tablet, a mobile phone or a notebook, or other devices that can achieve the same or similar functions. The engine speed regulation system includes an engine speed control function. In this embodiment and the following embodiments, the engine speed control method of the present invention is described by taking a computer as an example. This solution adjusts the engine speed by combining a hybrid vehicle with a P1+P3 structure in the series power generation mode, thereby avoiding the engine speed being in the roaring frequency band and causing a roaring sound. The target motor in this solution may refer to the P3 motor.

[0052] It can be understood that the mechanism of brake roar is the engine series power generation condition. When the driver steps on the brake pedal to brake, when the maximum motor recovery torque MCU_T Max is greater than the maximum allowable torque T of the powertrain mount systemmountMax , at this time, the mount enters the non-linear region, the stiffness of the mount system increases sharply, the rigid body mode of the powertrain is improved, and the vibration isolation performance of the mount decreases. Under this condition, more of the 2nd-order excitation energy of the engine is transmitted to the vehicle body through the mount system, which is coupled with the cavity mode inside the vehicle, resulting in booming noise inside the vehicle. The conventional method to solve this problem is to adjust the mount performance and improve its vibration isolation level under braking conditions. However, changing the hardware has a high cost and a long development and verification cycle. The present invention provides an optimization method for the braking booming problem of a hybrid vehicle based on engine speed control. Without changing the hardware, based on the P3 electric drive torque MCU_T Req value feedback in real time by the vehicle control unit VCU, the engine speed control target EngSpdTarg is dynamically adjusted to avoid the booming frequency band Δf Booming inside the vehicle, completely solving the booming problem of the whole vehicle during braking. To further illustrate this solution, refer to Figure 3 the schematic diagram of the P1+P3 electric drive architecture of the hybrid vehicle and its vehicle layout shown. The hybrid electric drive configuration is a P1+P3 architecture, which has series power generation mode, braking energy recovery and other modes. The hybrid powertrain is connected to the vehicle body longitudinal beam and subframe through 3-point (left mount, right mount, rear mount) or 4-point (adding a front mount or a rear mount based on the 3-point mount) mounts. The mount system mainly plays a role in supporting and vibration isolation. When the hybrid vehicle equipped with this architecture is in the braking condition, the series regenerative braking system CRBS (Cooperative Regenerative Braking System) preferentially distributes the braking force to the electric braking according to the brake pedal stroke and the braking speed signal. When the electric braking ability is insufficient, the remaining braking force is distributed to the physical braking. The physical braking is no different from that of a traditional vehicle, while the electric braking recovers the braking kinetic energy by the drive motor, and the kinetic energy is converted into electrical energy and stored in the power battery. During electric braking, the hybrid powertrain will have a large forward tilt under the action of large torque, and the mount system will be quickly compressed, entering the non-linear region, with a sharp increase in stiffness and a decrease in vibration isolation performance. If the vehicle is in the series power generation mode during this process, more of the engine vibration will be transmitted to the vehicle body through the mount system. If it is coupled with the acoustic cavity mode inside the vehicle, it will cause the booming problem inside the vehicle.

[0053] Among them, the CRBS is matched with a brake-by-wire system, and the brake-by-wire system (brake-by-wire hydraulic EHB or brake-by-wire motor EMB) can decouple the braking force from the brake caliper. The mechanical braking force can be executed by a brake-by-wire controller unit according to the target braking force input signal.

[0054] It should be understood that when the target vehicle is in the series power generation mode and a brake pedal signal is detected, the brake pedal signal may refer to the brake signal collected by the brake pedal sensor when the driver presses the brake pedal. Through the brake signal, the brake pedal displacement and the speed of pressing the brake pedal (i.e., how fast the brake pedal is pressed) can be determined.

[0055] In a specific implementation, when the target hybrid vehicle is in the series power generation mode, the motor regeneration torque of the target motor (i.e., the P3 motor) is monitored by real-time monitoring of the brake pedal signal, so as to facilitate the later regulation of the engine speed according to the real-time motor regeneration torque.

[0056] Further, the step S10 further includes: when the target vehicle is in the series power generation mode and a brake pedal signal is detected, obtaining brake pedal information and battery information; determining the motor regeneration torque according to the brake pedal information and the battery information.

[0057] It should be noted that the brake pedal information may refer to the information determined by the brake signal collected by the brake pedal sensor when the driver presses the brake pedal. The information includes pedal displacement and the speed of pressing the brake pedal, etc. The battery information may refer to the information corresponding to the battery in the power system of the hybrid vehicle. The information includes the SOC value (current battery charge), battery pack temperature, and battery standard capacitance.

[0058] Further, the step of determining the motor regeneration torque according to the brake pedal information and the battery information includes: obtaining displacement information and the speed of pressing the brake pedal from the brake pedal information; obtaining the SOC value and battery pack temperature from the battery information; determining the motor regeneration torque according to the displacement information, the speed of pressing the brake pedal, the SOC value, the battery pack temperature, and the current vehicle speed information.

[0059] It should be noted that displacement information and the speed of pressing the brake pedal are obtained from the brake pedal information; the SOC value (current battery capacitance) and battery pack temperature are obtained from the battery information; the motor regeneration torque is determined according to the displacement information, the speed of pressing the brake pedal, the SOC value, the battery pack temperature, and the current vehicle speed information.

[0060] Further, the step of determining the motor regeneration torque according to the displacement information, the speed of pressing the brake pedal, the SOC value, the battery pack temperature, and the current vehicle speed information includes: determining the electric braking force and the mechanical braking force according to the displacement information, the speed of pressing the brake pedal, the SOC value, the battery pack temperature, and the current vehicle speed information; determining the motor regeneration torque according to the electric braking force and the mechanical braking force.

[0061] It should be noted that when the vehicle is in the series power generation mode and the driver steps on the brake pedal, the IPB (Integrated Brake Control System) adjusts the mechanical braking and electric braking ratios in real time according to the brake pedal displacement and speed signals (the speed of stepping on the pedal). Among them, the physical braking and electric braking ratios can be determined according to the preset adjustment ratio, and the preset adjustment ratio can be the braking force distribution ratio determined according to historical experimental data.

[0062] It can be understood that in the vehicle series power generation mode, when the driver steps on the brake pedal, the IPB obtains the brake pedal displacement and speed signals, as well as signals such as the SOC, battery pack temperature, and vehicle speed feedback by the VCU. The CRBS intelligently distributes the electric braking force and mechanical braking force according to these signals and the preset adjustment ratio, and converts the above electric braking force and mechanical braking force to the corresponding actuators as the motor recovery torque and the brake master cylinder pressure. Among them, the CRBS braking torque distribution ratio is the ratio based on the principle of priority kinetic energy recovery, that is, the principle ratio in which the motor distributes a larger proportion of the braking torque for power generation.

[0063] In specific implementation, since the electric braking force and the mechanical braking force are intelligently distributed according to the corresponding ratio, it is necessary to determine the motor recovery torque according to the real-time electric braking force and mechanical braking force. And in order to ensure the accuracy of the motor recovery torque, it is necessary to monitor the brake pedal displacement information, the speed of stepping on the brake pedal, the SOC value, the battery pack temperature, and the current vehicle speed information in real time, so as to determine the motor recovery torque corresponding to the current P3 motor.

[0064] Step S20: Determine whether it is necessary to compensate the engine speed according to the motor recovery torque and the preset mount torque, and obtain a judgment result.

[0065] It should be noted that the preset mount torque can be the maximum allowable torque of the mount system corresponding to the target vehicle type set in advance. In order to avoid the vehicle roar caused by the over-tight compression of the mount system spring, it is necessary to determine whether it is necessary to compensate the engine speed according to the preset mount torque, and obtain a judgment result.

[0066] It can be understood that the judgment result includes two judgment results: it is necessary to compensate the engine speed and it is not necessary to compensate the engine speed. Among them, when it is necessary to compensate the engine speed, the VCU requests the engine controller EMS to compensate the engine speed EngSpdTarg.

[0067] Step S30: Determine the target engine speed according to the judgment result and the preset roar frequency, and control the rotation of the target engine according to the target engine speed.

[0068] It should be noted that when the judgment result indicates that the engine speed needs to be compensated, the VCU requests the engine controller EMS to compensate the engine speed EngSpdTarg, and the compensated engine speed does not cross the speed range covered by the vehicle booming frequency band. The vehicle booming frequency band may refer to the preset booming frequency that the engine speed range corresponding to the target hybrid vehicle determined by pre-experiment will cause booming. The frequency may refer to a frequency range, not limited to a single value.

[0069] It can be understood that to further illustrate the process of optimizing braking booming based on engine speed regulation in this solution, reference can be made to Figure 4 the optimization flowchart of hybrid vehicle braking booming control shown in the figure. When the hybrid vehicle is in the series power generation mode, the driver steps on the brake pedal, and the IPB obtains the brake pedal displacement, fast and slow signals, and signals such as the SOC, battery pack temperature, and vehicle speed fed back by the VCU. The CRBS adjusts the physical braking and electric braking ratios in real time according to the above signals, intelligently distributes the electric braking force and physical braking force, and converts to the corresponding actuators for motor regenerative torque and brake master cylinder pressure. The VCU detects the motor regenerative torque MCU_T currently requested by the IPB in real time Req , when MCU_T Req ≥T MountMax , the VCU requests the engine controller EMS to compensate the engine speed EngSpdTarg, and the compensated engine speed does not cross the speed range covered by the vehicle booming frequency band.

[0070] In specific implementation, when the vehicle is in the series power generation mode, under weak braking intensity and medium braking intensity, the maximum motor regenerative torque MCU_T Max is not less than the maximum allowable torque T of the mounting system MountMax , and the vehicle controller VCU dynamically adjusts the engine speed control target value according to the motor request torque MCU_T Req fed back by the IPB in real time, so that it does not cross the preset booming frequency (the vehicle booming frequency band Δf Booming ). This solution dynamically adjusts the engine speed control target EngSpdTarg through the value of the P3 motor torque MCU_T Req fed back by the vehicle controller in real time, avoiding the vehicle interior booming frequency band Δf Booming , and completely solving the braking booming problem of hybrid vehicle models.

[0071] In this embodiment, when the target vehicle is in the series power generation mode and the brake pedal signal is detected, the motor recovery torque corresponding to the target motor of the target vehicle is obtained; it is determined whether the engine speed needs to be compensated according to the motor recovery torque and the preset mount torque, and a judgment result is obtained; the target engine speed is determined according to the judgment result and the preset booming frequency, and the target engine is controlled to rotate according to the target engine speed. Compared with the existing brake booming adjustment scheme, which has a high cost of changing hardware and a long development and verification cycle, in this embodiment, without changing the hardware, by monitoring the motor recovery torque corresponding to the target motor in real time and dynamically adjusting the engine speed, the vehicle booming frequency is avoided, the vehicle brake booming problem is completely solved, and it can be used for the optimization of the booming problems of different hybrid vehicle models. At the same time, because there is no hardware change, the development and verification cycle is short and the cost is low.

[0072] Based on the above Figure 2 shown in the first embodiment, the second embodiment of the engine speed control method of the present invention is proposed. Refer to Figure 5 , Figure 5 which is the flowchart of the second embodiment of the engine speed control method of the present invention.

[0073] In this embodiment, the step S20 further includes:

[0074] Step S201: If the motor recovery torque is not less than the preset mount torque, it is determined that the engine speed needs to be compensated.

[0075] It should be noted that in this solution, it is determined whether the engine speed needs to be compensated by comparing the motor recovery torque with the preset mount torque. In the vehicle series power generation mode, if the maximum negative torque of the electric drive TM CU Max is not less than the maximum allowable torque T of the mount system MountMax , it is determined that the engine speed needs to be compensated. The vehicle control unit VCU dynamically adjusts the engine speed control target value according to the motor request torque MCU_T Req real-time feedback by IPB, so that it does not cross the vehicle booming frequency band Δf Booming .

[0076] Step S202: If the motor recovery torque is less than the preset mount torque, it is determined that the engine speed does not need to be compensated.

[0077] It should be noted that if MCU_T Req <T MountMax , it is determined that the engine speed does not need to be compensated, that is, the engine speed runs according to the non-compensated value of the vehicle control logic.

[0078] Further, the step S30 further includes: when it is determined that the engine speed needs to be compensated, determining the engine speed value to be adjusted according to the engine speed range corresponding to the preset vehicle booming frequency; determining the target engine speed according to the engine speed value to be adjusted and the current engine speed; and controlling the engine to rotate according to the target engine speed.

[0079] It should be noted that when it is determined that the engine speed needs to be compensated, the engine speed value to be adjusted is determined according to the engine speed range corresponding to the preset vehicle booming frequency.

[0080] The engine speed range corresponding to the preset booming frequency is determined by the following formula:

[0081] where ΔEngSpd Booming is the engine speed range corresponding to the booming, and f Booming is the preset booming frequency.

[0082] It can be understood that when MCU_T Req ≥ T MountMa x, the VCU requests the engine controller EMS to compensate the engine speed EngSpdTarg so that it does not cross the vehicle booming frequency band. The vehicle booming frequency band Δf Booming is obtained according to the real vehicle test or simulation calculation, and the relationship between Δf Booming and the engine speed is

[0083] It should be understood that the engine speed value to be adjusted is determined according to the engine speed range corresponding to the preset vehicle booming frequency, and the current engine speed is adjusted according to the engine speed value to be adjusted, so that the adjusted target engine speed is not within the engine speed range corresponding to the preset booming frequency, thereby reducing the braking booming.

[0084] In this embodiment, when the target vehicle is in the series power generation mode and the brake pedal signal is detected, the motor recovery torque corresponding to the target motor of the target vehicle is obtained; if the motor recovery torque is not less than the preset mount torque, it is determined that the engine speed needs to be compensated; if the motor recovery torque is less than the preset mount torque, it is determined that the engine speed does not need to be compensated; the target engine speed is determined according to the judgment result and the preset booming frequency, and the target engine is controlled to rotate according to the target engine speed. Compared with the existing braking booming adjustment scheme, the cost of changing the hardware is relatively high and the development and verification cycle is long. In this embodiment, without changing the hardware, by real-time monitoring the motor recovery torque corresponding to the target motor and dynamically adjusting the engine speed, the vehicle booming frequency is avoided, and the vehicle braking booming problem is completely solved.

[0085] In addition, to achieve the above object, the present invention further provides a storage medium, on which an engine speed control program is stored. When the engine speed control program is executed by a processor, the steps of the engine speed control method described above are implemented.

[0086] Referring to Figure 6 , Figure 6 is a structural block diagram of the first embodiment of the engine speed control device of the present invention.

[0087] As Figure 6 shown, the engine speed control device proposed in the embodiment of the present invention includes:

[0088] A torque determination module 10, configured to obtain the motor recovery torque corresponding to the target motor of the target vehicle when the target vehicle is in a series power generation mode and a brake pedal signal is detected;

[0089] A compensation judgment module 20, configured to judge whether engine speed compensation is required according to the motor recovery torque and a preset mount torque, and obtain a judgment result;

[0090] A speed adjustment module 30, configured to determine a target engine speed according to the judgment result and a preset booming frequency, and control the rotation of the target engine according to the target engine speed.

[0091] In this embodiment, when the target vehicle is in a series power generation mode and a brake pedal signal is detected, the motor recovery torque corresponding to the target motor of the target vehicle is obtained; it is judged whether engine speed compensation is required according to the motor recovery torque and a preset mount torque, and a judgment result is obtained; the target engine speed is determined according to the judgment result and a preset booming frequency, and the rotation of the target engine is controlled according to the target engine speed. Compared with the existing brake booming adjustment scheme, where the cost of changing hardware is relatively high and the development and verification cycle is long, in this embodiment, without changing the hardware, by real-time monitoring the motor recovery torque corresponding to the target motor and dynamically adjusting the engine speed, the vehicle booming frequency is avoided, and the vehicle brake booming problem is completely solved.

[0092] Further, the torque determination module 10 is further configured to obtain brake pedal information and battery information when the target vehicle is in a series power generation mode and a brake pedal signal is detected; and determine the motor recovery torque according to the brake pedal information and the battery information.

[0093] Further, the torque determination module 10 is further configured to obtain displacement information and the speed of stepping on the brake pedal from the brake pedal information; obtain the SOC value and the battery pack temperature from the battery information; and determine the motor recovery torque according to the displacement information, the speed of stepping on the brake pedal, the SOC value, the battery pack temperature, and the current vehicle speed information.

[0094] Further, the torque determination module 10 is further configured to determine the electric braking force and the mechanical braking force according to the displacement information, the speed of stepping on the brake pedal, the SOC value, the battery pack temperature, and the current vehicle speed information; and determine the motor recovery torque according to the electric braking force and the mechanical braking force.

[0095] Further, the compensation judgment module 20 is further configured to determine that the engine speed needs to be compensated if the motor recovery torque is not less than the preset mount torque; and determine that the engine speed does not need to be compensated if the motor recovery torque is less than the preset mount torque.

[0096] Further, the speed adjustment module 30 is further configured to, when it is determined that the engine speed needs to be compensated, determine the engine speed value to be adjusted according to the engine speed range corresponding to the preset vehicle booming frequency; determine the target engine speed according to the engine speed value to be adjusted and the current engine speed; and control the engine to rotate according to the target engine speed.

[0097] It should be understood that the above is only an example for illustration and does not impose any limitation on the technical solution of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not limit this.

[0098] It should be noted that the above-described working process is only illustrative and does not limit the protection scope of the present invention. In actual applications, those skilled in the art can select some or all of them according to actual needs to achieve the purpose of the solution of this embodiment, and there is no limitation here.

[0099] In addition, for the technical details not described in detail in this embodiment, reference can be made to the engine speed control method provided in any embodiment of the present invention, and details will not be repeated here.

[0100] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or system including that element.

[0101] The serial numbers of the embodiments of the present invention above are only for description and do not represent the superiority or inferiority of the embodiments. Among the several unit claims of the devices, several of these devices may be embodied by the same hardware item. The use of the words "first", "second", and "third", etc. does not indicate any order, and these words may be interpreted as names.

[0102] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases, the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that makes contributions to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as a Read Only Memory image (ROM) / Random Access Memory (RAM), magnetic disk, optical disk), and includes several instructions for causing a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0103] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An engine speed control method, characterized in that, The engine speed control method includes the following steps: When the target vehicle is in the series power generation mode and a brake pedal signal is detected, obtain the motor recovery torque corresponding to the target motor of the target vehicle; Judge whether it is necessary to compensate the engine speed according to the motor recovery torque and the preset mount torque, and obtain a judgment result; Determine the target engine speed according to the judgment result and the preset booming frequency, and control the rotation of the target engine according to the target engine speed; Among them, the step of judging whether it is necessary to compensate the engine speed according to the motor recovery torque and the preset mount torque, and obtaining a judgment result includes: when the motor recovery torque MCU_TReq ≥ the preset mount torque TMountMax, it is determined that the engine speed needs to be compensated; if the motor recovery torque MCU_TReq is less than the preset mount torque TMountMax, it is determined that the engine speed does not need to be compensated; Among them, the step of determining the target engine speed according to the judgment result and the preset booming frequency, and controlling the rotation of the target engine according to the target engine speed includes: When it is determined that engine speed compensation is required, the engine speed value to be adjusted is determined according to the engine speed range corresponding to the preset booming frequency, and the engine speed range corresponding to the preset booming frequency is determined by the following formula: where ΔEngSpd Booming is the corresponding engine speed range; f Booming is the preset booming frequency; wherein, the compensated engine speed does not cross the speed range covered by the vehicle booming frequency band, and the vehicle booming frequency band refers to the preset booming frequency that the engine speed range corresponding to the target hybrid vehicle determined by pre-experiment will cause booming, and the preset booming frequency refers to a frequency range, not limited to a single value; Determine the target engine speed according to the engine speed value to be adjusted and the current engine speed; control the rotation of the engine according to the target engine speed.

2. The engine speed control method according to claim 1, wherein, The step of obtaining the motor recovery torque corresponding to the target motor of the target vehicle when the target vehicle is in the series power generation mode and a brake pedal signal is detected includes: When the target vehicle is in the series power generation mode and a brake pedal signal is detected, obtain the brake pedal information and the battery information; Determine the motor recovery torque according to the brake pedal information and the battery information.

3. The engine speed control method according to claim 2, wherein The step of determining the motor recovery torque according to the brake pedal information and the battery information includes: Obtain the displacement information and the speed of stepping on the brake pedal from the brake pedal information; Obtain the SOC value and the battery pack temperature from the battery information; Determine the motor recovery torque according to the displacement information, the speed of stepping on the brake pedal, the SOC value, the battery pack temperature, and the current vehicle speed information.

4. The engine speed control method according to claim 3, characterized in that The step of determining the motor recovery torque according to the displacement information, the speed of stepping on the brake pedal, the SOC value, the battery pack temperature, and the current vehicle speed information includes: Determine the electric braking force and the mechanical braking force according to the displacement information, the speed of stepping on the brake pedal, the SOC value, the battery pack temperature, and the current vehicle speed information; Determine the motor recovery torque according to the electric braking force and the mechanical braking force.

5. An engine speed control device, characterized in that, The engine speed control device includes: a memory, a processor, and an engine speed control program stored on the memory and executable on the processor. When the engine speed control program is executed by the processor, it implements the engine speed control method according to any one of claims 1 to 4.

6. A storage medium, characterized in that, An engine speed control program is stored on the storage medium. When the engine speed control program is executed by the processor, it implements the engine speed control method according to any one of claims 1 to 4.

7. An engine speed control device, characterized in that, The engine speed control device executes the engine speed control method as described in Claim 1, and the engine speed control device includes: A torque determination module, configured to obtain the motor recovery torque corresponding to the target motor of the target vehicle when the target vehicle is in a series power generation mode and a brake pedal signal is detected; A compensation judgment module, configured to judge whether engine speed compensation is required according to the motor recovery torque and a preset mount torque, and obtain a judgment result; A speed adjustment module, configured to determine a target engine speed according to the judgment result and a preset booming frequency, and control the rotation of the target engine according to the target engine speed.

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