Speed ​​limiting method, device, computer equipment, storage medium and product

Abstract

The present application relates to a vehicle speed limiting method, apparatus, computer equipment, storage medium, and product. The method includes: when the speed of a drive motor currently driving the vehicle is greater than a speed threshold, determining a first drive power limit based on the parameters of the drive motor and the speed threshold, wherein the drive motor is one of a first motor and a second motor; determining a first power generation limit of a generator motor based on the first drive power limit, wherein the generator motor is the other of the first and second motors other than the drive motor; determining a first engine start power limit based on the first power generation limit and the parameters of the planetary gear mechanisms corresponding to the generator motor and the engine, and controlling the engine output power to be less than or equal to the first start power limit. The method of the present application not only limits the speed of the vehicle by limiting the power of the drive motor, but also prevents battery overcharging, thereby increasing the battery life.

Description

Technical Field

[0001] The present application relates to the field of vehicle control technology, and in particular to a vehicle speed limiting method, device, computer equipment, storage medium and product. Background Art

[0002] With the development of the automotive industry and in response to the global energy crisis, the powertrain of vehicles has gradually become electrified, and hybrid vehicles have developed rapidly. Hybrid vehicles can reduce fuel consumption and have low emissions and pollution. Therefore, the application of hybrid vehicles is becoming more and more widespread. To ensure the safety of hybrid vehicles, speed limits are required for hybrid vehicles.

[0003] In conventional technology, the speed of a hybrid vehicle is limited by limiting the power of the drive motor of the hybrid vehicle.

[0004] However, using traditional technology to limit the speed of hybrid vehicles will reduce the battery life of the hybrid vehicles. Summary of the Invention

[0005] Based on this, it is necessary to provide a vehicle speed limiting method, device, computer equipment, storage medium and product that can limit the speed of hybrid vehicles while also protecting the battery and improving battery life in order to address the above technical problems.

[0006] A vehicle speed limiting method is applied to a vehicle including an engine, a first motor, a second motor, a battery, and a planetary gear mechanism, wherein the first motor, the second motor, and the battery are connected in parallel, and the engine, the first motor, and the second motor are mechanically connected via the planetary gear mechanism and used to drive the vehicle; the method comprises:

[0007] When the speed of a drive motor currently driving the vehicle is greater than a speed threshold, determining a first driving power limit according to parameters of the drive motor and the speed threshold, wherein the drive motor is one of the first motor and the second motor;

[0008] determining a first power generation limit power of a generator motor according to the first drive limit power, wherein the generator motor is the other of the first motor and the second motor except the drive motor;

[0009] A first starting limit power of the engine is determined according to the first power generation limit power and the parameters of the planetary gear mechanism corresponding to the generator motor and the engine respectively, and the output power of the engine is controlled to be less than or equal to the first starting limit power.

[0010] In one embodiment, the speed limiting method further includes:

[0011] When the speed of the generator motor currently generating electricity is greater than the speed threshold, determining a second power generation limit power according to the parameters of the generator motor and the speed threshold, wherein the generator motor is one of the first motor and the second motor;

[0012] determining a second driving limit power of a driving motor according to the second power generation limit power, wherein the driving motor is the other of the first motor and the second motor except the power generation motor;

[0013] The second start-up limit power of the engine is determined according to the second drive limit power and the parameters of the planetary gear mechanisms corresponding to the drive motor and the engine respectively, and the output power of the engine is controlled to be less than or equal to the second start-up limit power.

[0014] In one embodiment, the speed limiting method further includes:

[0015] Get the current vehicle speed and target vehicle speed;

[0016] determining a vehicle speed difference according to the current vehicle speed and the target vehicle speed;

[0017] determining a compensation power according to the vehicle speed difference;

[0018] The compensation power is provided to the driving motor by the battery.

[0019] In one embodiment, the speed limiting method further includes:

[0020] determining a first driving power according to the output power of the engine when the speed of the driving motor is greater than a speed threshold and the compensation power;

[0021] The engine is controlled to provide the first driving power to the generator motor, and the compensation power provided to the driving motor through the battery is stopped.

[0022] In one embodiment, the speed limiting method further includes:

[0023] determining a second driving power according to the output power of the engine when the speed of the generator motor is greater than a speed threshold and the compensation power;

[0024] The engine is controlled to provide the second driving power to the driving motor, and the battery is stopped from providing the compensation power to the driving motor.

[0025] In one embodiment, the speed limiting method further includes:

[0026] acquiring a target vehicle speed when the speed of the driving motor currently driving the vehicle is less than or equal to a speed threshold;

[0027] The target power of the engine is determined according to the target vehicle speed, and the output power of the engine is controlled to be the target power.

[0028] A vehicle speed limiter is applied to a vehicle including an engine, a first motor, a second motor, a battery, and a planetary gear mechanism, wherein the first motor, the second motor, and the battery are connected in parallel, and the engine, the first motor, and the second motor are mechanically connected via the planetary gear mechanism and used to drive the vehicle; the device comprises:

[0029] a driving power determination module, configured to determine a first driving power limit according to parameters of a driving motor and the speed threshold when the speed of the driving motor currently driving the vehicle is greater than a speed threshold, wherein the driving motor is one of the first motor and the second motor;

[0030] a power generation determination module, configured to determine a first power generation limit of a generator motor according to the first drive limit power, wherein the generator motor is the other of the first motor and the second motor excluding the drive motor;

[0031] The engine power limiting module is configured to determine a first engine power limit of the engine according to the first power generation limit power and parameters of the planetary gear mechanisms corresponding to the generator motor and the engine, respectively, and to control the output power of the engine to be less than or equal to the first engine power limit power.

[0032] A computer device includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the aforementioned method when executing the computer program.

[0033] A computer-readable storage medium stores a computer program, which implements the steps of the aforementioned method when executed by a processor.

[0034] A computer program product comprises a computer program, which implements the steps of the aforementioned method when executed by a processor.

[0035] The aforementioned vehicle speed limiting method, apparatus, computer device, storage medium, and product are applied to a hybrid vehicle comprising an engine, a first motor, a second motor, and a battery, wherein the first motor, the second motor, and the battery are connected in parallel, and the engine, the first motor, and the second motor are mechanically connected via a planetary gear mechanism and used to drive the vehicle. This vehicle speed limiting method first detects the speed of the drive motor that drives the vehicle. When the speed of the drive motor exceeds a speed threshold, it indicates that the vehicle is speeding, and the speed of the drive motor needs to be limited to below the speed threshold. Therefore, a first driving power limit is determined based on the parameters of the drive motor and the speed threshold. When the power of the drive motor is limited to below the first driving power limit, the vehicle speed is limited. Since the power of the drive motor is provided by a generator motor, limiting the power of the drive motor to below the first driving power limit also requires determining a first generating power limit of the generator motor. Since the power of the generator motor is provided by the engine, a first engine power limit is determined based on the first generating power limit and the parameters of the planetary gear mechanisms corresponding to the generator motor and the engine. The engine output power is then controlled to be less than or equal to the first generating power limit, thereby limiting the power of the generator motor. When the power of the drive motor is limited, if the power of the generator motor is not limited, the power provided by the generator motor will be much greater than the power consumed by the drive motor. As a result, the excess power will be supplied to the battery, causing the battery to overcharge and shortening the battery life. Therefore, the method of the present application can limit the speed of the vehicle by limiting the power of the drive motor while also preventing battery overcharging, protecting the battery and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 is a flow chart of a vehicle speed limiting method in one embodiment;

[0038] Figure 2 is a structural diagram of a vehicle in one embodiment;

[0039] Figure 3 is a flow chart of a vehicle speed limiting method in another embodiment;

[0040] Figure 4 1 is a flow chart of a method for adjusting vehicle speed in one embodiment;

[0041] Figure 5 is a flow chart of a vehicle speed limiting method in yet another embodiment;

[0042] Figure 6 is a flow chart of a vehicle speed limiting method in yet another embodiment;

[0043] Figure 7 is a flow chart of a vehicle speed control method in one embodiment;

[0044] Figure 8 is a structural diagram of a vehicle speed limiting device in one embodiment;

[0045] Figure 9 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment.

[0046] Explanation of reference numerals: 10 - engine, 20 - first motor, 30 - second motor, 40 - battery, 50 - planetary gear mechanism. DETAILED DESCRIPTION

[0047] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0049] It will be understood that the terms "first," "second," etc. used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element.

[0050] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intervening element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc., if there is transmission of electrical signals or data between the connected objects.

[0051] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0052] In one embodiment, Figure 1 As shown, a speed limiting method is provided, which is applied to Figure 2 The vehicle shown includes an engine 10, a first motor 20, a second motor 30, a battery 40, and a planetary gear mechanism 50, wherein the first motor 20, the second motor 30, and the battery 40 are connected in parallel, and the engine 10, the first motor 20, and the second motor 30 are mechanically connected via the planetary gear mechanism 50 and used to drive the vehicle. The method includes:

[0053] Step S100 : When the speed of the driving motor currently driving the vehicle is greater than a speed threshold, a first driving limit power is determined according to the parameters of the driving motor and the speed threshold.

[0054] The driving motor is one of the first motor and the second motor.

[0055] Specifically, the speed of the drive motor currently driving the vehicle determines the vehicle speed. When the speed of the drive motor is greater than a speed threshold, it means that the vehicle is speeding and the power of the drive motor needs to be limited.

[0056] For example, a drive power limit coefficient can be obtained based on the parameters of the drive motor and the speed threshold. The first drive power limit coefficient is obtained by multiplying the rated power of the drive motor by the drive power limit coefficient. When the drive power of the drive motor is the first drive power limit, the speed of the drive motor is less than or equal to the speed threshold.

[0057] Step S110 : determining a first power generation limit power of the generator motor according to the first driving limit power.

[0058] The generator motor is the other one of the first motor and the second motor except the drive motor.

[0059] Specifically, the generator motor provides power to the drive motor, enabling the drive motor to output drive power. Since the generator motor and the drive motor are connected in parallel, the resistance is low when the motor is in the driving state, so electric energy flows from the generator motor to the drive motor.

[0060] Exemplarily, the relationship between the first driving limit power and the first power generation limit power is established by the following formula:

[0061] P 1c =P 1d ×μ1

[0062] Among them, P 1c is the first power generation limit power, P 1d is the first driving limit power, and μ1 is the power conversion efficiency when the generator motor provides generated power to the driving motor.

[0063] Step S120 , determining a first starting power limit of the engine according to the first power generation limit, parameters of the planetary gear mechanisms corresponding to the generator motor and the engine, and controlling the output power of the engine to be less than or equal to the first starting power limit.

[0064] Specifically, the engine and the generator motor are mechanically connected via a planetary gear mechanism, so that the power output by the engine is transmitted to the generator motor via the planetary gear mechanism. Therefore, the first starting power limit of the engine can be inferred from the first generating power limit. When the engine output power is at the first starting power limit, the generating power of the generator motor is at the first generating power limit. Therefore, by limiting the engine output power to be less than or equal to the first starting power limit, the generating power of the generator motor can be limited to be less than or equal to the first generating power limit, thereby limiting the driving power of the drive motor to be less than or equal to the first driving power limit, thereby achieving vehicle speed limit. If the power of the generator motor is not limited when the driving motor power is limited, the power provided by the generator motor will be far greater than the power consumed by the drive motor. Consequently, the excess power will be supplied to the battery, causing battery overcharge and reducing battery life. In this application, speed limit is achieved by limiting the engine power. Therefore, when speed limit is applied, the power provided by the generator motor will not be far greater than the power consumed by the drive motor, thus preventing battery overcharge.

[0065] Exemplarily, the relationship between the first power generation limit power and the first engine limit power is established by the following formula:

[0066]

[0067] Among them, P 1e is the first engine limit power, P 1c is the first power generation limit power, k is the ratio of the number of teeth of the ring gear of the planetary gear mechanism corresponding to the engine to the number of teeth of the ring gear of the planetary gear mechanism corresponding to the generator motor, and n r is the speed of the ring gear of the planetary gear mechanism corresponding to the engine, n s is the rotational speed of the ring gear of the planetary gear mechanism corresponding to the generator motor.

[0068] In this embodiment, the vehicle speed limiting method first detects the speed of the drive motor that drives the vehicle. When the speed of the drive motor exceeds a speed threshold, it indicates that the vehicle is speeding. In this case, the speed of the drive motor needs to be limited to below the speed threshold. Therefore, a first drive power limit is determined based on the drive motor parameters and the speed threshold. When the drive motor power is limited to below the first drive power limit, the vehicle speed is limited. Since the power of the drive motor is provided by a generator motor, limiting the power of the drive motor to below the first drive power limit also requires determining a first generator power limit for the generator motor. Since the power of the generator motor is provided by an engine, a first engine power limit for the engine is determined based on the first generator power limit and the parameters of the planetary gear mechanisms corresponding to the generator motor and the engine. The engine output power is then controlled to be less than or equal to the first engine power limit, thereby limiting the power of the generator motor. If the power of the generator motor is not limited when the power of the drive motor is limited, the power provided by the generator motor will be far greater than the power consumed by the drive motor. Consequently, the excess power will be supplied to the battery, causing overcharging and shortening the battery life. Therefore, by adopting the method of the present application, while limiting the power of the drive motor to achieve vehicle speed limit, it is also possible to avoid battery overcharging, protect the battery, and increase the battery life.

[0069] In one embodiment, Figure 3 As shown, the speed limit method also includes:

[0070] Step S300: When the rotation speed of the generator motor currently generating electricity is greater than a rotation speed threshold, a second power generation limit power is determined according to the parameters of the generator motor and the rotation speed threshold.

[0071] The generator motor is one of the first motor and the second motor.

[0072] Specifically, if the generator motor currently generating electricity fails during vehicle speed control, the speed may be too high. This excessive generator speed can result in excessive power generation, causing the generator motor to draw energy from the battery to generate electricity. If the generator motor speed continues to exceed the speed threshold, the battery may over-discharge. Therefore, limiting the generator motor power to below the second power limit can prevent battery over-discharge.

[0073] For example, a power limit coefficient can be obtained based on the generator motor's parameters and the speed threshold. The second power limit is obtained by multiplying the generator motor's rated power by the power limit coefficient. When the generator motor's power is at the second power limit, the generator motor's speed is less than or equal to the speed threshold.

[0074] Step S310 : determining a second driving limit power of the driving motor according to the second power generation limit power.

[0075] The driving motor is the other one of the first motor and the second motor except the generator motor.

[0076] Specifically, the generator motor provides power generation to the drive motor, enabling the drive motor to output drive power. Since the generator motor and the drive motor are connected in parallel, the resistance is low when the motor is in the driving state, so the electric energy will flow from the generator motor to the drive motor. By limiting the drive power of the drive motor, the power generation of the generator motor can be limited.

[0077] Exemplarily, the relationship between the second driving limit power and the second power generation limit power is established by the following formula:

[0078] P 2c =P 2d ×μ2

[0079] Among them, P 2c is the second power generation limit power, P 2d is the second driving limit power, and μ2 is the power conversion efficiency when the generator motor provides generated power to the driving motor.

[0080] It should be noted that, while in the above embodiment, the first motor is a generator motor and the second motor is a drive motor, in this embodiment, the first motor is a drive motor and the second motor is a generator motor. In this application, the engine provides power to the first motor, and the first and second motors provide power to each other. That is, when the first motor is a generator motor and the second motor is a drive motor, all the power provided by the first motor is transferred to the second motor. When the second motor is a generator motor, the first motor is a drive motor and all the power provided by the second motor is transferred to the first motor.

[0081] Step S320 , determining a second start-up limit power of the engine according to the second drive limit power and the parameters of the planetary gear mechanisms corresponding to the drive motor and the engine, and controlling the output power of the engine to be less than or equal to the second start-up limit power.

[0082] Specifically, the engine and drive motor are mechanically connected via a planetary gear mechanism, so that the engine's output power is transmitted to the drive motor via the planetary gear mechanism. Therefore, the engine's second starting power limit can be inferred from the second starting power limit. When the engine's output power is at the second starting power limit, the drive motor's drive power is at the second driving power limit. Therefore, by limiting the engine's output power to less than or equal to the second starting power limit, the drive motor's drive power can be limited to less than or equal to the second driving power limit, and thus the generator motor's power can be limited to less than or equal to the second power generation power limit, thereby preventing battery over-discharge.

[0083] Exemplarily, the relationship between the second driving limit power and the second starting limit power is established by the following formula:

[0084]

[0085] Among them, P 2e The second engine limit power, P 2c is the second driving limit power, k is the ratio of the number of teeth of the ring gear of the planetary gear mechanism corresponding to the engine to the number of teeth of the ring gear of the planetary gear mechanism corresponding to the drive motor, and n r is the speed of the ring gear of the planetary gear mechanism corresponding to the engine, n t is the speed of the ring gear of the planetary gear mechanism corresponding to the drive motor.

[0086] In this embodiment, the speed of the generator motor is first detected. When the speed of the generator motor exceeds a speed threshold, it indicates a risk of battery over-discharge. In this case, the generator motor speed needs to be limited to below the speed threshold. Therefore, a second power generation limit is determined based on the generator motor parameters and the speed threshold. When the power of the generator motor is limited to below the second power generation limit, battery over-discharge is prevented. The generator motor's power is supplied to the drive motor. To ensure that the power of the generator motor remains below the second power generation limit, the power of the drive motor needs to be limited to below the second power driving limit. Since the power of the drive motor is provided by the engine, a second engine power limit is determined based on the second power driving limit and the parameters of the planetary gear mechanisms corresponding to the drive motor and the engine. The engine output power is then controlled to be less than or equal to the second power generation limit, thereby limiting the power of the drive motor. By limiting the engine output power to less than or equal to the second power generation limit, the drive motor's drive power is limited to less than or equal to the second drive power limit, and thus the generator motor's power is limited to less than or equal to the second power generation limit, thereby preventing battery over-discharge.

[0087] In one embodiment, Figure 4 As shown, the speed limit method also includes:

[0088] Step S400: obtaining the current vehicle speed and the target vehicle speed.

[0089] Specifically, the current vehicle speed can be directly obtained through a speed sensor on the vehicle, and the target vehicle speed is the preset speed of the speed limit, which can also be directly obtained.

[0090] Step S410: determining a vehicle speed difference based on the current vehicle speed and the target vehicle speed.

[0091] Specifically, the speed difference can be obtained by subtracting the target speed from the current speed.

[0092] Step S420: Determine the compensation power according to the vehicle speed difference.

[0093] Specifically, based on the speed difference, the power required to reduce the speed difference to zero is determined. This refers to the power required to adjust the drive motor power to bring the current vehicle speed to the target speed. This power is referred to as the compensation power. In other words, the compensation power is used to adjust the current drive motor power, increasing or decreasing the compensation power based on the current drive motor power to reduce the speed difference to zero.

[0094] For example, the compensation power can be calculated by a proportional integral (PI) controller. The calculation formula is as follows:

[0095] P b =K p ×ΔV+K i ×ΔV

[0096] Among them, P b To compensate the power, K p is the proportionality coefficient, K i is the integral coefficient, and ΔV is the vehicle speed difference. The proportional coefficient and integral coefficient can be obtained by looking up the table and are both pre-calibrated values.

[0097] Step S430: providing compensation power to the driving motor via the battery.

[0098] Specifically, the battery's ability to provide both positive and negative power allows it to provide compensation power to the drive motor, enabling regulation of the motor's drive power. The battery can absorb the motor's output power, reducing vehicle speed, or it can provide power to the motor, increasing vehicle speed.

[0099] For example, after calculating the compensation power, the battery can be directly controlled to output power or absorb power according to the compensation power. The relative power of the first motor and the second motor can also be adjusted according to the compensation power so that the battery can output power or absorb power.

[0100] In this embodiment, the compensation power is calculated from the vehicle speed difference, which in turn determines the power required to adjust the drive motor to adjust the vehicle speed. The battery then provides the compensation power to the drive motor, achieving vehicle speed regulation. Using the battery to adjust the drive motor power offers a faster response and adjustment speed than using the engine to adjust the drive motor power, facilitating quicker speed control.

[0101] In one embodiment, Figure 5 As shown, the speed limit method also includes:

[0102] Step S500 : determining a first driving power according to the output power and the compensation power of the engine when the rotational speed of the driving motor is greater than a rotational speed threshold.

[0103] Specifically, the engine's output power when the drive motor's speed is greater than the speed threshold is the vehicle's engine output power at the time the speed limit is activated. The compensation power is the power calculated to adjust the drive motor to achieve the vehicle's speed limit. Therefore, a first drive power is derived based on the compensation power and the engine's output power at the time the speed limit is activated. The engine then outputs the first drive power to drive the vehicle, thereby adjusting the vehicle's speed to the target speed.

[0104] Exemplarily, the first driving power is determined by the following formula:

[0105] P q1 =P a1 +P b

[0106] Among them, P q1 is the first driving power, P a1 is the output power of the engine when the speed of the driving motor is greater than the speed threshold, P b To compensate power.

[0107] For example, if the current vehicle speed is 105 km / h and the target vehicle speed is 100 km / h, the compensation power P is calculated. b =-10kw, therefore, based on the current power of the drive motor that is currently driving the vehicle, reducing it by 10kw can change the vehicle speed from 105km / h to 100km / h. The power of the drive motor is determined by the engine, so it is necessary to a1 Based on this, adjust the compensation power P b The vehicle speed can be adjusted to the target speed.

[0108] Step S510: Control the engine to provide the first driving power to the generator motor, and stop providing the compensation power to the driving motor through the battery.

[0109] Specifically, after the compensation power is calculated, the battery is used to provide compensation power to the drive motor first, which can adjust the vehicle speed more quickly. However, if the battery is continuously used to provide compensation power, it will cause battery overcharge or over-discharge, affecting its life. Therefore, when the engine can provide compensation power, the battery stops providing compensation power to the drive motor.

[0110] In this embodiment, the engine output power is adjusted based on the engine output power when the vehicle speed limit is activated and the calculated compensation power required to achieve the vehicle speed limit. This results in the engine output power required to meet the speed limit conditions, thus achieving vehicle speed limit control. Furthermore, when the engine provides the first drive power, the battery stops providing compensation power to the drive motor. This protects the battery, prevents overcharging or over-discharging, and improves battery life.

[0111] In one embodiment, Figure 6 As shown, the speed limit method also includes:

[0112] Step S600: determining a second driving power according to the output power and the compensation power of the engine when the rotational speed of the generator motor is greater than a rotational speed threshold.

[0113] Specifically, the output power of the engine when the speed of the generator motor is greater than the speed threshold is the output power of the vehicle's engine at the moment the vehicle activates the speed limit, and the compensation power is the power calculated to adjust the generator motor to achieve the vehicle speed limit (since the power of the drive motor is related to the power of the generator motor, limiting the power of the generator motor can indirectly limit the power of the drive motor and achieve the speed limit of the vehicle). Therefore, based on the compensation power and the output power of the engine at the moment the vehicle activates the speed limit, the second driving power can be obtained. The engine outputs the second driving power to provide it to the vehicle, so that the speed of the vehicle can be adjusted to the target speed.

[0114] Exemplarily, the second driving power is determined by the following formula:

[0115] P q2 =P a2 +P b

[0116] Among them, P q2 is the second driving power, P a2 is the output power of the engine when the speed of the generator motor is greater than the speed threshold, P b To compensate power.

[0117] For example, if the current vehicle speed is 105 km / h and the target vehicle speed is 100 km / h, the compensation power P is calculated. b =-10kw, therefore, based on the current power of the generator motor that currently provides power to the drive motor, reducing it by 10kw can change the vehicle speed from 105km / h to 100km / h. The power of the generator motor is determined by the engine, so it is necessary to a2 Based on this, adjust the compensation power P b The vehicle speed can be adjusted to the target speed.

[0118] Step S610: Control the engine to provide the second driving power to the driving motor, and stop providing the compensation power to the driving motor through the battery.

[0119] Specifically, after the compensation power is calculated, the battery is used to provide compensation power to the drive motor first, which can adjust the vehicle speed more quickly. However, if the battery is continuously used to provide compensation power, it will cause battery overcharge or over-discharge, affecting its life. Therefore, when the engine can provide compensation power, the battery stops providing compensation power to the drive motor.

[0120] In this embodiment, the engine output power is adjusted based on the engine output power when the vehicle speed limit is activated and the calculated compensation power required to achieve the vehicle speed limit. This results in the engine output power required to meet the speed limit conditions, thus achieving vehicle speed control. Furthermore, when the engine provides the second drive power, the battery stops providing compensation power to the drive motor, protecting the battery from overcharging or over-discharging, thereby extending battery life.

[0121] In one embodiment, Figure 7 As shown, the speed limit method also includes:

[0122] Step S700 , obtaining a target vehicle speed when the speed of the driving motor currently driving the vehicle is less than or equal to a speed threshold.

[0123] Specifically, when the speed of the drive motor currently driving the vehicle is less than or equal to the speed threshold, it means that the vehicle is not speeding, and there is no need to activate the speed limit. It is only necessary to obtain the target vehicle speed required by the user.

[0124] Step S710 , determining the target power of the engine according to the target vehicle speed, and controlling the output power of the engine to be the target power.

[0125] Specifically, the target power of the engine corresponding to the target vehicle speed is pre-configured, and the output power of the engine can be adjusted to the target power directly according to the target vehicle speed.

[0126] In this embodiment, when the vehicle is not speeding, the vehicle is in normal operating state. At this time, there is no need to limit the vehicle's engine power. It is only necessary to adjust the engine's output power to the target power according to the user's target speed to meet the user's required speed.

[0127] It should be understood that although Figure 1 、 Figure 3-7 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figure 1 、 Figure 3-7 At least part of the steps may include multiple steps or multiple stages. These steps or stages are not necessarily performed at the same time, but can be performed at different times. The order of execution of these steps or stages is not necessarily one by one, but can be performed in turn or alternately with other steps or at least part of the steps or stages in other steps.

[0128] In one embodiment, Figure 8 As shown, a vehicle speed limiter is provided, which is applied to a vehicle including an engine, a first motor, a second motor, a battery, and a planetary gear mechanism. The first motor, the second motor, and the battery are connected in parallel, and the engine, the first motor, and the second motor are mechanically connected via the planetary gear mechanism and used to drive the vehicle. The device includes a driving power determination module 801, a generated power determination module 802, and a starting power limiting module 803, wherein:

[0129] The driving power determination module 801 is used to determine a first driving limit power according to the parameters and speed threshold of the driving motor when the speed of the driving motor currently driving the vehicle is greater than the speed threshold, wherein the driving motor is one of the first motor and the second motor.

[0130] The power generation determination module 802 is configured to determine a first power generation limit power of the generator motor according to the first drive limit power, wherein the generator motor is the other of the first motor and the second motor except the drive motor.

[0131] The engine power limiting module 803 is used to determine the first engine power limit of the engine according to the first power generation limit and the parameters of the planetary gear mechanisms corresponding to the generator motor and the engine, and control the output power of the engine to be less than or equal to the first power generation limit.

[0132] In one embodiment, the vehicle speed limiting device further comprises: a power generation limit determining module, a driving limit determining module, and a starting limit determining module, wherein:

[0133] The power generation limit power determination module is used to determine the second power generation limit power according to the parameters and speed threshold of the generator motor when the speed of the generator motor currently generating electricity is greater than the speed threshold, wherein the generator motor is one of the first motor and the second motor.

[0134] a driving limit power determination module, configured to determine a second driving limit power of the driving motor according to the second power generation limit power, wherein the driving motor is the other of the first motor and the second motor except the power generation motor;

[0135] The engine power limit determination module is used to determine the second engine power limit of the engine according to the second driving power limit and the parameters of the planetary gear mechanisms corresponding to the driving motor and the engine respectively, and control the output power of the engine to be less than or equal to the second engine power limit.

[0136] In one embodiment, the vehicle speed limiting device further comprises: a vehicle speed obtaining module, a difference obtaining module, a compensation power determining module, and a compensation module, wherein:

[0137] The vehicle speed acquisition module is used to obtain the current vehicle speed and the target vehicle speed.

[0138] The difference acquisition module is used to determine the vehicle speed difference based on the current vehicle speed and the target vehicle speed.

[0139] The compensation power determination module is used to determine the compensation power according to the vehicle speed difference.

[0140] The compensation module is used to provide compensation power to the drive motor through the battery.

[0141] In one embodiment, the vehicle speed limiting device further comprises: a first adjustment power determination module and a first vehicle speed control module, wherein:

[0142] The first regulating power determining module is configured to determine a first driving power according to the output power and the compensation power of the engine when the rotational speed of the driving motor is greater than a rotational speed threshold.

[0143] The first vehicle speed control module is used to control the engine to provide the first driving power to the generator motor and stop providing the compensation power to the driving motor through the battery.

[0144] In one embodiment, the vehicle speed limiting device further comprises: a second regulated power determination module and a second vehicle speed control module, wherein:

[0145] The second regulating power determination module is used to determine the second driving power according to the output power and the compensation power of the engine when the speed of the generator motor is greater than the speed threshold.

[0146] The second vehicle speed control module is used to control the engine to provide the second driving power to the driving motor and stop providing the compensation power to the driving motor through the battery.

[0147] In one embodiment, the vehicle speed limiting device further comprises: a target vehicle speed acquisition module and a power control module, wherein:

[0148] The target vehicle speed acquisition module is used to acquire the target vehicle speed when the speed of the driving motor currently driving the vehicle is less than or equal to the speed threshold.

[0149] The power control module is used to determine the target power of the engine according to the target vehicle speed and control the output power of the engine to be the target power.

[0150] For the specific definition of the speed limiter, please refer to the definition of the speed limiter method above, which will not be repeated here. The various modules in the above-mentioned speed limiter can be implemented in whole or in part by software, hardware, or a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. In actual implementation, there may be other division methods.

[0151] In one embodiment, a computer device is provided, wherein the internal structure of the computer device can be as follows: Figure 9 As shown. The computer device includes a processor, memory, and a network interface connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal via a network connection. When executed by the processor, the computer program implements a vehicle speed limit method.

[0152] Those skilled in the art will understand that Figure 9 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0153] In one embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0154] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0155] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0156] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0157] Throughout this specification, references to terms such as "some embodiments," "other embodiments," and "desired embodiments" indicate that a particular feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. Although these terms are used interchangeably throughout this specification, they do not necessarily refer to the same embodiment or example.

[0158] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0159] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A vehicle speed limiting method, characterized in that: Applicable to a vehicle comprising an engine, a first motor, a second motor, a battery, and a planetary gear mechanism, wherein the first motor, the second motor, and the battery are connected in parallel, and the engine, the first motor, and the second motor are mechanically connected via the planetary gear mechanism and used to drive the vehicle; the method comprising: When the speed of a drive motor currently driving the vehicle is greater than a speed threshold, determining a first driving power limit according to parameters of the drive motor and the speed threshold, wherein the drive motor is one of the first motor and the second motor; determining a first power generation limit power of a generator motor according to the first drive limit power, wherein the generator motor is the other of the first motor and the second motor except the drive motor; A first starting limit power of the engine is determined according to the first power generation limit power and the parameters of the planetary gear mechanism corresponding to the generator motor and the engine respectively, and the output power of the engine is controlled to be less than or equal to the first starting limit power.

2. The method according to claim 1, characterized in that The method further comprises: When the speed of the generator motor currently generating electricity is greater than the speed threshold, determining a second power generation limit power according to the parameters of the generator motor and the speed threshold, wherein the generator motor is one of the first motor and the second motor; determining a second driving limit power of a driving motor according to the second power generation limit power, wherein the driving motor is the other of the first motor and the second motor except the power generation motor; The second start-up limit power of the engine is determined according to the second drive limit power and the parameters of the planetary gear mechanisms corresponding to the drive motor and the engine respectively, and the output power of the engine is controlled to be less than or equal to the second start-up limit power.

3. The method according to claim 2, characterized in that The method further comprises: Get the current vehicle speed and target vehicle speed; determining a vehicle speed difference according to the current vehicle speed and the target vehicle speed; determining a compensation power according to the vehicle speed difference; The compensation power is provided to the driving motor by the battery.

4. The method according to claim 3, characterized in that The method further comprises: determining a first driving power according to the output power of the engine when the speed of the driving motor is greater than a speed threshold and the compensation power; The engine is controlled to provide the first driving power to the generator motor, and the compensation power provided to the driving motor through the battery is stopped.

5. The method according to claim 3, characterized in that The method further comprises: determining a second driving power according to the output power of the engine when the speed of the generator motor is greater than a speed threshold and the compensation power; The engine is controlled to provide the second driving power to the driving motor, and the battery is stopped from providing the compensation power to the driving motor.

6. The method according to any one of claims 1 to 5, characterized in that The method further comprises: acquiring a target vehicle speed when the speed of the driving motor currently driving the vehicle is less than or equal to a speed threshold; The target power of the engine is determined according to the target vehicle speed, and the output power of the engine is controlled to be the target power.

7. A vehicle speed limiting device, characterized in that: Applicable to a vehicle including an engine, a first motor, a second motor, a battery, and a planetary gear mechanism, wherein the first motor, the second motor, and the battery are connected in parallel, and the engine, the first motor, and the second motor are mechanically connected via the planetary gear mechanism and used to drive the vehicle; the device includes: a driving power determination module, configured to determine a first driving power limit according to parameters of a driving motor and the speed threshold when the speed of the driving motor currently driving the vehicle is greater than a speed threshold, wherein the driving motor is one of the first motor and the second motor; a power generation determination module, configured to determine a first power generation limit of a generator motor according to the first drive limit power, wherein the generator motor is the other of the first motor and the second motor excluding the drive motor; The engine power limiting module is configured to determine a first engine power limit of the engine according to the first power generation limit power and parameters of the planetary gear mechanisms corresponding to the generator motor and the engine, respectively, and to control the output power of the engine to be less than or equal to the first engine power limit power.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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