Vehicle control method, device, apparatus and readable storage medium

Abstract

The application discloses a vehicle control method, device and equipment and a readable storage medium, and relates to the technical field of vehicle control. The vehicle control method comprises the following steps: in response to a range extender starting instruction, starting a range extender of a target vehicle; acquiring a real-time water temperature and an initial starting water temperature of an engine in the range extender; determining a maximum power generation of the range extender and a maximum torque rising rate according to the initial starting water temperature and the real-time water temperature; and controlling the range extender of the target vehicle to generate power according to the maximum power generation and the maximum torque rising rate. The application improves the reliability of the range extender under a starting condition.

Description

Technical Field

[0001] This invention relates to the field of vehicle control technology, and in particular to a vehicle control method, apparatus, device, and readable storage medium. Background Technology

[0002] In the new energy vehicle market, range-extended electric vehicles (REEVs) have experienced rapid development in recent years due to their elimination of range anxiety and independence from charging infrastructure, gaining widespread recognition in terms of technology and market. The range extender, consisting of an engine and a generator, is one of the key components of a REEV. Because range extenders have low fuel consumption under medium-to-high load conditions, to pursue fuel economy, current REEVs typically enter a medium-to-high load power generation state immediately after the range extender starts.

[0003] However, when the ambient temperature is low, the internal frictional torque of the engine is relatively high. If the engine enters a medium-to-high load state for power generation shortly after starting the range extender, or even immediately, the engine needs to output a high torque to generate electricity while overcoming the large frictional torque. In this situation, the engine is very prone to stalling due to insufficient output torque. Furthermore, if the range extender's power generation increases too quickly when the engine coolant temperature is low, causing the engine's output torque to increase too rapidly, the same problem will occur. Therefore, the existing range extender starting strategy results in low reliability of the range extender under starting conditions. Summary of the Invention

[0004] The main objective of this invention is to provide a vehicle control method that aims to solve the technical problem of low reliability of existing range extenders during startup.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a vehicle control method, the vehicle control method comprising:

[0006] In response to the range extender activation command, the range extender of the target vehicle is activated;

[0007] Obtain the real-time coolant temperature and initial start-up coolant temperature of the engine in the range extender;

[0008] Based on the initial start-up water temperature and the real-time water temperature, determine the maximum power generation and maximum torque increase rate of the range extender;

[0009] The range extender of the target vehicle is controlled to generate electricity based on the maximum power output and the maximum torque increase rate.

[0010] According to the first aspect, the step of determining the maximum power generation and maximum torque increase rate of the range extender based on the initial start-up water temperature and the real-time water temperature includes:

[0011] Based on the initial start-up water temperature and the real-time water temperature, the corresponding real-time power generation is determined as the maximum power generation of the range extender;

[0012] Based on the real-time water temperature, the corresponding real-time torque increase rate is determined as the maximum torque increase rate of the range extender.

[0013] According to the first aspect, or any implementation of the first aspect above, the step of determining the corresponding real-time power generation as the maximum power generation of the range extender based on the initial start-up water temperature and the real-time water temperature includes:

[0014] Based on the initial startup water temperature and the real-time water temperature, a first preset mapping table is queried to determine the real-time power ratio corresponding to the initial startup water temperature and the real-time water temperature, wherein the initial startup water temperature and the real-time water temperature are positively correlated with the real-time power ratio;

[0015] Based on the real-time power ratio and the preset rated power generation, the corresponding real-time power generation is calculated, and the real-time power generation is used as the maximum power generation of the range extender.

[0016] According to the first aspect, or any implementation of the first aspect above, the step of determining the corresponding real-time torque rise rate as the maximum torque rise rate of the range extender based on the real-time water temperature includes:

[0017] Based on the real-time water temperature, a second preset mapping table is consulted to determine the real-time torque rise rate corresponding to the real-time water temperature, and the real-time torque rise rate is used as the maximum power generation of the range extender, wherein the real-time water temperature and the real-time torque rise rate are positively correlated.

[0018] According to the first aspect, or any implementation of the first aspect above, the step of controlling the range extender of the target vehicle to generate electricity based on the maximum power generation and the maximum torque increase rate includes:

[0019] The current torque and required power generation of the target vehicle are obtained, and the required torque corresponding to the required power generation is determined, as well as the first torque change rate between the current torque and the required torque.

[0020] Based on the maximum power generation and the required power generation, a corresponding first target torque is determined, wherein the first target torque is not greater than the first torque upper limit corresponding to the maximum power generation;

[0021] The second torque upper limit is calculated based on the current torque and the maximum torque increase rate.

[0022] Based on the first torque change rate and the maximum torque increase rate, a corresponding second target torque is determined, wherein the second target torque is not greater than the second torque upper limit;

[0023] The minimum value between the first target torque and the second target torque is used as the current target torque to control the range extender to generate electricity.

[0024] According to the first aspect, or any implementation of the first aspect above, the step of determining the corresponding first target torque based on the maximum power generation and the required power generation includes:

[0025] Determine whether the required power generation is greater than the maximum power generation.

[0026] If the required power generation is greater than the maximum power generation, then the upper limit of the first torque corresponding to the maximum power generation is taken as the first target torque;

[0027] If the required power generation is not greater than the maximum power generation, then the required torque is taken as the first target torque.

[0028] According to the first aspect, or any implementation of the first aspect above, the step of determining the corresponding second target torque based on the first torque change rate and the maximum torque increase rate includes:

[0029] Determine whether the first torque change rate is greater than the maximum torque increase rate;

[0030] If the first torque change rate is greater than the maximum torque increase rate, then the second torque upper limit is taken as the second target torque;

[0031] If the first torque change rate is not greater than the maximum torque increase rate, then the required torque is taken as the second target torque.

[0032] In a second aspect, the present invention provides a vehicle control device, the vehicle control device comprising:

[0033] The activation module is used to activate the range extender of the target vehicle in response to the range extender activation command.

[0034] The acquisition module is used to acquire the real-time water temperature and initial start-up water temperature of the engine in the range extender;

[0035] The limit determination module is used to determine the maximum power generation and maximum torque increase rate of the range extender based on the initial start-up water temperature and the real-time water temperature.

[0036] The control module is used to control the range extender of the target vehicle to generate electricity based on the maximum power output and the maximum torque increase rate.

[0037] According to the second aspect, the limit determination module is also used for:

[0038] Based on the initial start-up water temperature and the real-time water temperature, the corresponding real-time power generation is determined as the maximum power generation of the range extender;

[0039] Based on the real-time water temperature, the corresponding real-time torque increase rate is determined as the maximum torque increase rate of the range extender.

[0040] According to the second aspect, or any implementation of the second aspect above, the limit determination module is also used for:

[0041] Based on the initial startup water temperature and the real-time water temperature, a first preset mapping table is queried to determine the real-time power ratio corresponding to the initial startup water temperature and the real-time water temperature, wherein the initial startup water temperature and the real-time water temperature are positively correlated with the real-time power ratio;

[0042] Based on the real-time power ratio and the preset rated power generation, the corresponding real-time power generation is calculated, and the real-time power generation is used as the maximum power generation of the range extender.

[0043] According to the second aspect, or any implementation of the second aspect above, the limit determination module is also used for:

[0044] Based on the real-time water temperature, a second preset mapping table is consulted to determine the real-time torque rise rate corresponding to the real-time water temperature, and the real-time torque rise rate is used as the maximum power generation of the range extender, wherein the real-time water temperature and the real-time torque rise rate are positively correlated.

[0045] According to the second aspect, or any implementation of the second aspect above, the control module is also used for:

[0046] The current torque and required power generation of the target vehicle are obtained, and the required torque corresponding to the required power generation is determined, as well as the first torque change rate between the current torque and the required torque.

[0047] Based on the maximum power generation and the required power generation, a corresponding first target torque is determined, wherein the first target torque is not greater than the first torque upper limit corresponding to the maximum power generation;

[0048] The second torque upper limit is calculated based on the current torque and the maximum torque increase rate.

[0049] Based on the first torque change rate and the maximum torque increase rate, a corresponding second target torque is determined, wherein the second target torque is not greater than the second torque upper limit;

[0050] The minimum value between the first target torque and the second target torque is used as the current target torque to control the range extender to generate electricity.

[0051] According to the second aspect, or any implementation of the second aspect above, the control module is also used for:

[0052] Determine whether the required power generation is greater than the maximum power generation.

[0053] If the required power generation is greater than the maximum power generation, then the upper limit of the first torque corresponding to the maximum power generation is taken as the first target torque;

[0054] If the required power generation is not greater than the maximum power generation, then the required torque is taken as the first target torque.

[0055] According to the second aspect, or any implementation of the second aspect above, the control module is also used for:

[0056] Determine whether the first torque change rate is greater than the maximum torque increase rate;

[0057] If the first torque change rate is greater than the maximum torque increase rate, then the second torque upper limit is taken as the second target torque;

[0058] If the first torque change rate is not greater than the maximum torque increase rate, then the required torque is taken as the second target torque.

[0059] Thirdly, the present invention provides a vehicle control device, the vehicle control device comprising: a memory and a processor, wherein the memory stores a computer program executable on the processor, the computer program being configured to implement the steps of the vehicle control method as described above.

[0060] The third aspect and any implementation thereof correspond to the first aspect and any implementation thereof, respectively. The technical effects of the third aspect and any implementation thereof are similar to those of the first aspect and any implementation thereof, and will not be repeated here.

[0061] Fourthly, the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to perform a vehicle control method as described in any one of the first aspects or possible implementations thereof.

[0062] The fourth aspect and any implementation thereof correspond to the first aspect and any implementation thereof, respectively. The technical effects of the fourth aspect and any implementation thereof are similar to those of the first aspect and any implementation thereof, and will not be repeated here.

[0063] Fifthly, embodiments of the present invention provide a computer program including instructions for executing the vehicle control method in the first aspect and any possible implementation thereof.

[0064] The fifth aspect and any implementation thereof correspond to the first aspect and any implementation thereof, respectively. The technical effects of the fifth aspect and any implementation thereof are similar to those of the first aspect and any implementation thereof, and will not be repeated here.

[0065] This invention proposes a vehicle control method, device, equipment, and readable storage medium. In response to a range extender activation command, the range extender of the target vehicle is activated, at which point the range extender enters an idling state. The real-time coolant temperature of the engine in the range extender and the initial starting coolant temperature of the engine at the time of range extender activation are then obtained. Based on the initial starting coolant temperature and the real-time coolant temperature, the maximum power generation and maximum torque increase rate of the range extender are determined using a preset formula or a preset mapping table. Furthermore, based on the maximum power generation and the maximum torque increase rate, the power generation and torque increase rate of the range extender are limited to control the range extender of the target vehicle to generate electricity. This invention limits the power generation and torque increase rate of the range extender based on the real-time coolant temperature and the initial starting coolant temperature of the engine in the range extender, and this limitation changes with the real-time coolant temperature. This avoids the problems of excessive power generation leading to insufficient engine output torque when the ambient temperature of the range extender is low, or excessively rapid increase in engine output torque due to excessively rapid increase in power generation by the range extender, ultimately causing the range extender to stall and requiring frequent restarts. This invention effectively improves the reliability of the range extender under startup conditions, while also improving the NVH (Noise, Vibration, Harshness) performance of the range extender and reducing the overall fuel consumption of the range extender. Attached Figure Description

[0066] Figure 1 This is a flowchart illustrating the first embodiment of the vehicle control method of the present invention;

[0067] Figure 2 This is a schematic diagram of the architecture of the range extender involved in the embodiment of the present invention;

[0068] Figure 3 This is a flowchart illustrating the second embodiment of the vehicle control method of the present invention;

[0069] Figure 4 This is a schematic diagram of the vehicle control device of the present invention;

[0070] Figure 5 This is a schematic diagram of the device structure of the hardware operating environment involved in the embodiments of the present invention.

[0071] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0072] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0073] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0074] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order of objects. For example, "first target object" and "second target object," etc., are used to distinguish different target objects, not to describe a specific order of target objects.

[0075] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0076] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0077] The vehicle control method of the present invention will be described below with reference to some existing technologies:

[0078] In the new energy vehicle market, range-extended electric vehicles (REEVs) have experienced rapid development in recent years due to their elimination of range anxiety and independence from charging infrastructure, gaining widespread recognition in terms of technology and market. The range extender, consisting of an engine and a generator, is one of the key components of a REEV. Because range extenders have low fuel consumption under medium-to-high load conditions, to pursue fuel economy, current REEVs typically enter a medium-to-high load power generation state immediately after the range extender starts.

[0079] However, when the ambient temperature is low, the internal friction torque of the engine is relatively high. If the range extender enters a medium-to-high load state for power generation shortly after starting, or even immediately, the engine needs to output a high torque to generate electricity while overcoming the large friction torque. In this case, the engine is very likely to stall due to insufficient output torque. Additionally, if the range extender's power generation increases too quickly when the engine coolant temperature is low, causing the engine's output torque to increase too rapidly, the same problem will occur. Therefore, the existing range extender starting strategy results in low reliability during startup. Furthermore, after the engine stalls, the range extender frequently restarts, leading to increased fuel consumption and performance degradation. To address these issues, some range-extended vehicles employ an improvement strategy that limits the range extender's power generation function to a certain extent (e.g., 40% of the rated power generation) within a time threshold after startup (e.g., 30 seconds). However, due to the varying environments in which range-extended electric vehicles operate, its applicability is limited.

[0080] This invention determines the maximum power generation and maximum torque increase rate of the range extender by measuring the real-time coolant temperature and initial start-up coolant temperature of the engine in the range extender. This limits the power generation and torque increase rate of the range extender, and the limits also change with the real-time coolant temperature, thereby effectively improving the reliability of the range extender under operating conditions.

[0081] In one embodiment of the present invention, in response to a range extender activation command, the range extender of the target vehicle is activated, at which point the range extender enters an idling state. The real-time coolant temperature of the engine in the range extender and the initial starting coolant temperature of the engine at the time of range extender activation are then obtained. Based on the initial starting coolant temperature and the real-time coolant temperature, the maximum power generation and maximum torque increase rate of the range extender are determined using a preset formula or a preset mapping table. Then, based on the maximum power generation and the maximum torque increase rate, the power generation and torque increase rate of the range extender are limited to control the range extender of the target vehicle to generate electricity. This embodiment limits the power generation and torque increase rate of the range extender based on the real-time coolant temperature and the initial starting coolant temperature of the engine in the range extender, and this limitation changes with changes in the real-time coolant temperature. This avoids the problem of excessive power generation leading to insufficient engine output torque when the ambient temperature of the range extender is low, or excessively rapid increase in engine output torque due to excessively rapid increase in power generation by the range extender, ultimately causing the range extender to stall and requiring frequent restarts. This embodiment effectively improves the reliability of the range extender under startup conditions, while also improving the NVH performance of the range extender and reducing its overall fuel consumption.

[0082] Please refer to Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the vehicle control method of the present invention. It should be noted that although the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that shown here.

[0083] The first embodiment of the present invention provides a vehicle control method, the vehicle control method comprising the following steps:

[0084] Step S100: In response to the range extender activation command, the range extender of the target vehicle is activated;

[0085] In this embodiment, it should be noted that the target vehicle is a vehicle equipped with a range extender, such as a range-extended passenger car, range-extended bus, or range-extended truck. It is understood that the range extender is a component that combines an engine and a generator to provide electrical energy to the vehicle. See also... Figure 2 , Figure 2This is a schematic diagram of the architecture of a range extender according to an embodiment of the present invention. The range extender may include an engine management system, a generator controller, an engine, and a generator. The engine management system controls the engine, the generator controller controls the generator, and the vehicle controller controls the range extender. After the range extender is started, fuel is injected into the engine, which ignites the fuel and outputs torque to drive the flywheel FL1 to rotate. The flywheel FL1 then drives the generator to generate electricity, thus completing the power generation process of the range extender. Exemplarily, the vehicle controller can communicate with the engine management system and the generator controller via an internal CAN (Controller Area Network). The vehicle controller can also communicate with other controllers such as the battery management system via a common CAN. The vehicle controller can determine whether the range extender needs to be started by receiving bus signals such as remaining battery power, remaining fuel, vehicle fault signals, generator fault signals, and engine fault signals from the common CAN and internal CAN, as well as hard-wired signals such as range extender start signals.

[0086] As an example, when the target vehicle starts or when there is a need for power generation, such as when the remaining charge of the target vehicle's power battery is lower than a preset threshold, a range extender activation command will be issued to activate the range extender. In response to the range extender activation command, the target vehicle's range extender will be activated, at which point the range extender will start the engine and enter an idling state (i.e., the engine starts but does not output torque).

[0087] Step S200: Obtain the real-time water temperature and initial start-up water temperature of the engine in the range extender;

[0088] In this embodiment, it can be understood that the real-time coolant temperature refers to the real-time temperature of the engine coolant, and the initial start-up coolant temperature is the initial temperature of the engine coolant after the range extender starts. The real-time coolant temperature and the initial start-up coolant temperature can be temperature values ​​measured by a temperature sensor.

[0089] For example, a temperature sensor for detecting engine coolant may upload the detected coolant temperature value to a public CAN bus at predetermined intervals, thereby receiving the real-time coolant temperature and initial start-up coolant temperature of the engine in the range extender via the public CAN bus. Alternatively, a detection command may be sent to the temperature sensor for detecting engine coolant to receive the real-time coolant temperature and initial start-up coolant temperature of the engine in the range extender based on the detection command.

[0090] Step S300: Determine the maximum power generation and maximum torque increase rate of the range extender based on the initial start-up water temperature and the real-time water temperature.

[0091] In this embodiment, it is understood that the manufacturer can calibrate the maximum power generation and maximum torque increase rate of the range extender under different initial start-up water temperatures and real-time water temperatures, thereby obtaining the correspondence between the initial start-up water temperature and the real-time water temperature and the maximum power generation and maximum torque increase rate of the range extender. The correspondence can be described in the form of a formula or a mapping table.

[0092] As an example, the maximum power output of the range extender can be determined using a first preset formula or a first preset mapping table based on the initial startup water temperature and the real-time water temperature. The maximum torque rise rate of the range extender can then be determined using a second preset formula or a second preset mapping table based on the initial startup water temperature and the real-time water temperature. The first preset formula and the first preset mapping table describe the correspondence between the initial startup water temperature, the real-time water temperature, and the maximum power output of the range extender. The second preset formula and the second preset mapping table describe the correspondence between the initial startup water temperature, the real-time water temperature, and the maximum torque rise rate of the range extender. It is understood that the initial startup water temperature represents the initial temperature of the environment in which the range extender operates after startup, and the real-time water temperature represents the real-time temperature of the environment in which the range extender operates. The maximum torque rise rate has a higher correlation with the real-time temperature and a lower correlation with the initial startup temperature. Therefore, as another example, the corresponding real-time power output can be determined as the maximum power output of the range extender based on the initial startup water temperature and the real-time water temperature. The corresponding real-time torque rise rate can be determined as the maximum torque rise rate of the range extender based on the real-time water temperature.

[0093] The step S300, which involves determining the maximum power generation and maximum torque increase rate of the range extender based on the initial start-up water temperature and the real-time water temperature, includes:

[0094] Based on the initial start-up water temperature and the real-time water temperature, the corresponding real-time power generation is determined as the maximum power generation of the range extender;

[0095] Based on the real-time water temperature, the corresponding real-time torque increase rate is determined as the maximum torque increase rate of the range extender.

[0096] In this embodiment, based on the initial startup water temperature and the real-time water temperature, the corresponding real-time power generation is determined as the maximum power generation of the range extender using a first preset formula or a first preset mapping table. Furthermore, based on the real-time water temperature, the corresponding real-time torque rise rate is determined as the maximum torque rise rate of the range extender using a second preset formula or a second preset mapping table. Since both the maximum power generation and the maximum torque rise rate of the range extender are related to the real-time water temperature, they also change with the real-time water temperature, allowing for better adaptation to temperature variations in the range extender's environment. Moreover, because the maximum torque rise rate has a high correlation with real-time temperature but a low correlation with the initial startup temperature, determining the corresponding real-time torque rise rate as the maximum torque rise rate of the range extender based on the real-time water temperature also reduces the impact of the initial startup water temperature on the maximum torque rise rate, enabling the maximum torque rise rate to better adapt to temperature variations in the range extender's environment.

[0097] The step S310, which involves determining the corresponding real-time power generation as the maximum power generation of the range extender based on the initial startup water temperature and the real-time water temperature, includes:

[0098] Step S311: Based on the initial startup water temperature and the real-time water temperature, query the first preset mapping table to determine the real-time power ratio corresponding to the initial startup water temperature and the real-time water temperature, wherein the initial startup water temperature and the real-time water temperature are positively correlated with the real-time power ratio.

[0099] Step S312: Calculate the corresponding real-time power generation based on the real-time power ratio and the preset rated power generation, and use the real-time power generation as the maximum power generation of the range extender.

[0100] As an example, the first preset mapping table includes a mapping relationship between the initial startup water temperature, the real-time water temperature, and the real-time power ratio. The initial startup water temperature and the real-time water temperature are positively correlated with the real-time power ratio. For example, the first preset mapping table can be referenced in Table 1 below:

[0101] Table 1 First Preset Mapping Table

[0102]

[0103] Because the rated power of different range extenders varies significantly, this embodiment employs a first preset mapping table to further improve its applicability. This table includes a mapping relationship between the initial start-up coolant temperature and the real-time coolant temperature and the real-time power ratio. Based on the initial start-up coolant temperature and the real-time coolant temperature, the first preset mapping table is consulted to determine the corresponding real-time power ratio, where the initial start-up coolant temperature and the real-time coolant temperature are positively correlated with the real-time power ratio. Then, based on the real-time power ratio and the preset rated power generation, the corresponding real-time power generation is calculated and used as the maximum power generation of the range extender. The preset rated power is the rated power of the range extender, and the real-time power generation is the product of the real-time power ratio and the preset rated power generation. Furthermore, it is understood that since the engine is idling after the range extender starts, the real-time coolant temperature will gradually rise even if the range extender is not generating electricity.

[0104] The step S320, which involves determining the corresponding real-time torque increase rate as the maximum torque increase rate of the range extender based on the real-time water temperature, includes:

[0105] Step S321: Based on the real-time water temperature, query the second preset mapping table to determine the real-time torque rise rate corresponding to the real-time water temperature, and use the real-time torque rise rate as the maximum power generation of the range extender, wherein the real-time water temperature and the real-time torque rise rate are positively correlated.

[0106] As an example, the second preset mapping table includes a mapping relationship between real-time water temperature and real-time torque rise rate. The real-time water temperature and the real-time torque rise rate are positively correlated. The unit of the real-time torque rise rate is N / s. For example, the second preset mapping table can be referenced in Table 2 below:

[0107] Table 2 Second Preset Mapping Table

[0108]

[0109] The second preset mapping table in this embodiment includes a mapping relationship between real-time water temperature and real-time torque rise rate. Since the maximum torque rise rate has a high correlation with real-time temperature and a low correlation with the initial start-up temperature, the real-time torque rise rate corresponding to the real-time water temperature can be determined by querying the second preset mapping table based on the real-time water temperature, and the real-time torque rise rate can be used as the maximum power generation of the range extender, wherein the real-time water temperature and the real-time torque rise rate are positively correlated.

[0110] Step S400: Based on the maximum power generation and the maximum torque increase rate, control the range extender of the target vehicle to generate electricity.

[0111] In this embodiment, it can be understood that there is a mapping relationship between the power generation of the range extender and the engine speed, and there is also a mapping relationship between the engine speed and the engine torque.

[0112] In this embodiment, the torque of the engine in the range extender of the target vehicle is limited by the maximum power generation and the maximum torque increase rate. This prevents the engine torque of the range extender from exceeding the first maximum torque corresponding to the maximum power generation, and also prevents the engine torque increase rate of the range extender from exceeding the maximum torque increase rate. This avoids the problems of insufficient engine output torque due to excessively high power generation when the ambient temperature of the range extender is low, or excessively rapid increase in engine output torque due to excessively rapid increase in power generation, ultimately causing the range extender to stall and requiring frequent restarts. This embodiment effectively improves the reliability of the range extender under starting conditions, while also improving the NVH performance of the range extender and reducing its overall fuel consumption.

[0113] In the first embodiment of the present invention, in response to the range extender activation command, the range extender of the target vehicle is turned on, and the range extender enters an idling state. Then, the real-time coolant temperature of the engine in the range extender and the initial starting coolant temperature of the engine at the time of range extender activation are obtained. Then, based on the initial starting coolant temperature and the real-time coolant temperature, the maximum power generation and maximum torque increase rate of the range extender are determined by a preset formula or a preset mapping table; then, based on the maximum power generation and the maximum torque increase rate, the power generation and torque increase rate of the range extender are limited to control the range extender of the target vehicle to generate electricity. This embodiment limits the power generation and torque increase rate of the range extender based on the real-time coolant temperature and the initial starting coolant temperature of the engine in the range extender, and this limitation also changes with changes in the real-time coolant temperature. This avoids the problem of excessive power generation leading to insufficient engine output torque when the ambient temperature of the range extender is low, or excessively rapid increase in engine output torque due to excessively rapid increase in power generation by the range extender, ultimately causing the range extender to stall and requiring frequent restarts. This embodiment effectively improves the reliability of the range extender under startup conditions, while also improving the NVH performance of the range extender and reducing its overall fuel consumption.

[0114] Reference Figure 3 , Figure 3 This is a flowchart illustrating a second embodiment of the vehicle control method of the present invention.

[0115] A second embodiment of the present invention provides a vehicle control method, wherein the step of controlling the range extender of the target vehicle to generate electricity based on the maximum power generation and the maximum torque rise rate includes:

[0116] Step S410: Obtain the current torque and required power generation of the target vehicle, and determine the required torque corresponding to the required power generation, as well as the first torque change rate between the current torque and the required torque;

[0117] Step S420: Determine the corresponding first target torque based on the maximum power generation and the required power generation, wherein the first target torque is not greater than the first torque upper limit corresponding to the maximum power generation.

[0118] Step S430: Calculate the second torque upper limit based on the current torque and the maximum torque increase rate;

[0119] Step S440: Determine the corresponding second target torque based on the first torque change rate and the maximum torque increase rate, wherein the second target torque is not greater than the second torque upper limit.

[0120] Step S450: Use the minimum value between the first target torque and the second target torque as the current target torque to control the range extender to generate electricity.

[0121] In this embodiment, it can be understood that there is a mapping relationship between the power generation and the engine speed, and there is also a mapping relationship between the engine speed and the engine torque.

[0122] This embodiment obtains the current torque and required power generation of the target vehicle. It determines the required torque corresponding to the required power generation by leveraging the mapping relationship between the range extender's power generation and engine speed, as well as the mapping relationship between engine speed and engine torque. A first torque change rate is calculated by subtracting the difference between the current torque and the required torque from a preset torque detection period. Then, a first target torque can be determined based on the maximum power generation and the required power generation, wherein the first target torque is not greater than the upper limit of the first torque corresponding to the maximum power generation. As an example, the minimum of the maximum power generation and the required power generation can be used as the first target power generation. The first target torque corresponding to the first target power generation is determined by leveraging the mapping relationship between the range extender's power generation and engine speed, as well as the mapping relationship between engine speed and engine torque. As another example, the required power generation can be mapped to the range from zero to the maximum power generation to obtain a second target power generation. For example, if the rated power output of the range extender is 2000kW, the maximum power output is 500kW, and the required power output is 1000kW, then the second target power output is (500kW / 2000kW)*1000kW = 250kW. By establishing a mapping relationship between the range extender's power output and engine speed, and also between engine speed and engine torque, a first target torque corresponding to the second target power output is determined. Therefore, the first target torque can always be no greater than the first torque upper limit corresponding to the maximum power output.

[0123] Then, based on the current torque and the maximum torque increase rate, a second torque upper limit is calculated. For example, the second torque upper limit = current torque * (1 + maximum torque increase rate). Furthermore, based on the first torque change rate and the maximum torque increase rate, a corresponding second target torque can be determined, wherein the second target torque is not greater than the second torque upper limit. As an example, the minimum value between the first torque change rate and the maximum torque increase rate can be used as the first target torque increase rate. Then, based on the first target torque increase rate and the current torque, the corresponding second target torque is calculated. The second target torque = current torque * (1 + first target torque increase rate). As another example, the second target torque increase rate can be obtained by mapping the first torque change rate to the interval between zero and the maximum torque increase rate. Then, based on the second target torque increase rate and the current torque, the corresponding second target torque is calculated. The second target torque = current torque * (1 + second target torque increase rate). Therefore, the second target torque can always be no greater than the second torque upper limit.

[0124] Finally, the minimum of the first target torque and the second target torque can be used as the current target torque to control the range extender to generate electricity, so as to meet the two limits of the maximum power generation and the maximum torque rise rate on the engine torque in the range extender.

[0125] The step S410, which involves determining the corresponding first target torque based on the maximum power generation and the required power generation, includes:

[0126] Step A10: Determine whether the required power generation is greater than the maximum power generation.

[0127] Step A20: If the required power generation is greater than the maximum power generation, then the upper limit of the first torque corresponding to the maximum power generation is taken as the first target torque;

[0128] Step A30: If the required power generation is not greater than the maximum power generation, then the required torque is taken as the first target torque.

[0129] In this embodiment, it is determined whether the required power generation is greater than the maximum power generation. If the required power generation is greater than the maximum power generation, the upper limit of the first torque corresponding to the maximum power generation is taken as the first target torque. If the required power generation is not greater than the maximum power generation, the required torque is taken as the first target torque. Thus, this embodiment can meet the power generation requirements of the target vehicle as much as possible without exceeding the maximum power generation.

[0130] The step S440, which involves determining the corresponding second target torque based on the first torque change rate and the maximum torque increase rate, includes:

[0131] Step B10: Determine whether the first torque change rate is greater than the maximum torque increase rate;

[0132] Step B20: If the first torque change rate is greater than the maximum torque increase rate, then the second torque upper limit is taken as the second target torque.

[0133] Step B30: If the first torque change rate is not greater than the maximum torque increase rate, then the required torque is taken as the second target torque.

[0134] In this embodiment, it is determined whether the first torque change rate is greater than the maximum torque increase rate. If the first torque change rate is greater than the maximum torque increase rate, the second torque upper limit is taken as the second target torque; if the first torque change rate is not greater than the maximum torque increase rate, the required torque is taken as the second target torque. Therefore, this embodiment can meet the power generation requirements of the target vehicle as much as possible without exceeding the maximum torque increase rate.

[0135] In the second embodiment of the present invention, the current torque and required power generation of the target vehicle are obtained, and the required torque corresponding to the required power generation is determined, as well as a first torque change rate between the current torque and the required torque. Based on the maximum power generation and the required power generation, a corresponding first target torque is determined, wherein the first target torque is not greater than a first torque upper limit corresponding to the maximum power generation. Based on the current torque and the rate of increase of the maximum torque, a second torque upper limit is calculated. Based on the first torque change rate and the rate of increase of the maximum torque, a corresponding second target torque is determined, wherein the second target torque is not greater than the second torque upper limit. The minimum value between the first target torque and the second target torque is used as the current target torque to control the range extender to generate electricity. Thus, this embodiment satisfies the required power generation as much as possible while meeting the two limits of maximum power generation and maximum torque increase rate obtained based on the initial start-up water temperature and real-time water temperature. This avoids situations where the power generation is too high when the ambient temperature of the range extender is low, leading to insufficient engine output torque, or the range extender's power generation increases too quickly, causing the engine output torque to increase too rapidly and resulting in the range extender stalling. This effectively improves the reliability of the range extender under starting conditions.

[0136] Reference Figure 4 , Figure 4 This is a schematic diagram of the vehicle control device of the present invention.

[0137] The present invention also provides a vehicle control device, the vehicle control device comprising:

[0138] Module 10 is activated in response to a range extender activation command to activate the range extender of the target vehicle.

[0139] The acquisition module 20 is used to acquire the real-time water temperature and initial start-up water temperature of the engine in the range extender;

[0140] Limit determination module 30 is used to determine the maximum power generation and maximum torque increase rate of the range extender based on the initial start-up water temperature and the real-time water temperature.

[0141] The control module 40 is used to control the range extender of the target vehicle to generate electricity based on the maximum power generation and the maximum torque increase rate.

[0142] Optionally, the limit determination module 30 is also used for:

[0143] Based on the initial start-up water temperature and the real-time water temperature, the corresponding real-time power generation is determined as the maximum power generation of the range extender;

[0144] Based on the real-time water temperature, the corresponding real-time torque increase rate is determined as the maximum torque increase rate of the range extender.

[0145] Optionally, the limit determination module 30 is also used for:

[0146] Based on the initial startup water temperature and the real-time water temperature, a first preset mapping table is queried to determine the real-time power ratio corresponding to the initial startup water temperature and the real-time water temperature, wherein the initial startup water temperature and the real-time water temperature are positively correlated with the real-time power ratio;

[0147] Based on the real-time power ratio and the preset rated power generation, the corresponding real-time power generation is calculated, and the real-time power generation is used as the maximum power generation of the range extender.

[0148] Optionally, the limit determination module 30 is also used for:

[0149] Based on the real-time water temperature, a second preset mapping table is consulted to determine the real-time torque rise rate corresponding to the real-time water temperature, and the real-time torque rise rate is used as the maximum power generation of the range extender, wherein the real-time water temperature and the real-time torque rise rate are positively correlated.

[0150] Optionally, the control module 40 is also used for:

[0151] The current torque and required power generation of the target vehicle are obtained, and the required torque corresponding to the required power generation is determined, as well as the first torque change rate between the current torque and the required torque.

[0152] Based on the maximum power generation and the required power generation, a corresponding first target torque is determined, wherein the first target torque is not greater than the first torque upper limit corresponding to the maximum power generation;

[0153] The second torque upper limit is calculated based on the current torque and the maximum torque increase rate.

[0154] Based on the first torque change rate and the maximum torque increase rate, a corresponding second target torque is determined, wherein the second target torque is not greater than the second torque upper limit;

[0155] The minimum value between the first target torque and the second target torque is used as the current target torque to control the range extender to generate electricity.

[0156] Optionally, the control module 40 is also used for:

[0157] Determine whether the required power generation is greater than the maximum power generation.

[0158] If the required power generation is greater than the maximum power generation, then the upper limit of the first torque corresponding to the maximum power generation is taken as the first target torque;

[0159] If the required power generation is not greater than the maximum power generation, then the required torque is taken as the first target torque.

[0160] Optionally, the control module 40 is also used for:

[0161] Determine whether the first torque change rate is greater than the maximum torque increase rate;

[0162] If the first torque change rate is greater than the maximum torque increase rate, then the second torque upper limit is taken as the second target torque;

[0163] If the first torque change rate is not greater than the maximum torque increase rate, then the required torque is taken as the second target torque.

[0164] like Figure 5 As shown, Figure 5 This is a schematic diagram of the device structure of the hardware operating environment involved in the embodiments of the present invention.

[0165] Specifically, the vehicle control device may be a VCU (Vehicle Control Unit), PC (Personal Computer), tablet computer, portable computer, or server, etc.

[0166] like Figure 5As shown, the vehicle 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. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk drive. The memory 1005 may also optionally be a storage device independent of the aforementioned processor 1001.

[0167] Those skilled in the art will understand that Figure 5 The device structure shown does not constitute a limitation on the vehicle control device, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0168] like Figure 5 As shown, the memory 1005, which serves as a computer storage medium, may include an operating system, a network communication module, a user interface module, and a vehicle control application.

[0169] exist Figure 5 In the device shown, the network interface 1004 is mainly used to connect to the backend server and communicate data with the backend server; the user interface 1003 is mainly used to connect to the client and communicate data with the client; and the processor 1001 can be used to call the vehicle control program stored in the memory 1005 to implement the operations in the vehicle control method provided in the above embodiments.

[0170] Furthermore, embodiments of the present invention also propose a vehicle including the aforementioned vehicle control equipment. It is understood that the vehicle may also include energy storage devices, drive systems, and other devices that ensure the normal operation of the vehicle.

[0171] Furthermore, this embodiment of the invention also proposes a computer storage medium storing a computer program. When the computer program is executed by a processor, it implements the operations in the vehicle control method provided in the above embodiments. The specific steps will not be described in detail here.

[0172] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity / operation / object from another, and do not necessarily require or imply any such actual relationship or order between these entities / operations / objects; the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0173] For the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and relevant details can be found in the description of the method embodiments. The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate. Some or all of the modules can be selected to achieve the purpose of the present invention according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0174] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0175] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes 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 ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, vehicle, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0176] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A vehicle control method, characterized in that, The vehicle control method includes the following steps: In response to the range extender activation command, the range extender of the target vehicle is activated; The real-time coolant temperature and initial start-up coolant temperature of the engine in the range extender are obtained, wherein the initial start-up coolant temperature represents the initial temperature of the environment in which the range extender is located after startup, and the real-time coolant temperature represents the real-time temperature of the environment in which the range extender is located. Based on the initial startup water temperature and the real-time water temperature, the maximum power generation and maximum torque rise rate of the range extender are determined, wherein the step of determining the maximum power generation and maximum torque rise rate of the range extender based on the initial startup water temperature and the real-time water temperature includes: Based on the initial start-up water temperature and the real-time water temperature, the corresponding real-time power generation is determined as the maximum power generation of the range extender; based on the real-time water temperature, the corresponding real-time torque rise rate is determined as the maximum torque rise rate of the range extender. The range extender of the target vehicle is controlled to generate electricity based on the maximum power output and the maximum torque increase rate.

2. The vehicle control method as described in claim 1, characterized in that, The step of determining the corresponding real-time power generation as the maximum power generation of the range extender based on the initial start-up water temperature and the real-time water temperature includes: Based on the initial startup water temperature and the real-time water temperature, a first preset mapping table is queried to determine the real-time power ratio corresponding to the initial startup water temperature and the real-time water temperature, wherein the initial startup water temperature and the real-time water temperature are positively correlated with the real-time power ratio; Based on the real-time power ratio and the preset rated power generation, the corresponding real-time power generation is calculated, and the real-time power generation is used as the maximum power generation of the range extender.

3. The vehicle control method as described in claim 1, characterized in that, The step of determining the corresponding real-time torque rise rate as the maximum torque rise rate of the range extender based on the real-time water temperature includes: Based on the real-time water temperature, a second preset mapping table is consulted to determine the real-time torque rise rate corresponding to the real-time water temperature, and the real-time torque rise rate is used as the maximum power generation of the range extender, wherein the real-time water temperature and the real-time torque rise rate are positively correlated.

4. The vehicle control method according to any one of claims 1 to 3, characterized in that, The step of controlling the range extender of the target vehicle to generate electricity based on the maximum power generation and the maximum torque increase rate includes: The current torque and required power generation of the target vehicle are obtained, and the required torque corresponding to the required power generation is determined, as well as the first torque change rate between the current torque and the required torque. Based on the maximum power generation and the required power generation, a corresponding first target torque is determined, wherein the first target torque is not greater than the first torque upper limit corresponding to the maximum power generation; The second torque upper limit is calculated based on the current torque and the maximum torque increase rate. Based on the first torque change rate and the maximum torque increase rate, a corresponding second target torque is determined, wherein the second target torque is not greater than the second torque upper limit; The minimum value between the first target torque and the second target torque is used as the current target torque to control the range extender to generate electricity.

5. The vehicle control method as described in claim 4, characterized in that, The step of determining the corresponding first target torque based on the maximum power generation and the required power generation includes: Determine whether the required power generation is greater than the maximum power generation. If the required power generation is greater than the maximum power generation, then the upper limit of the first torque corresponding to the maximum power generation is taken as the first target torque; If the required power generation is not greater than the maximum power generation, then the required torque is taken as the first target torque.

6. The vehicle control method as described in claim 4, characterized in that, The step of determining the corresponding second target torque based on the first torque change rate and the maximum torque increase rate includes: Determine whether the first torque change rate is greater than the maximum torque increase rate; If the first torque change rate is greater than the maximum torque increase rate, then the second torque upper limit is taken as the second target torque; If the first torque change rate is not greater than the maximum torque increase rate, then the required torque is taken as the second target torque.

7. A vehicle control device, characterized in that, The vehicle control device includes: The activation module is used to activate the range extender of the target vehicle in response to the range extender activation command. The acquisition module is used to acquire the real-time water temperature and initial start-up water temperature of the engine in the range extender, wherein the initial start-up water temperature represents the initial temperature of the environment in which the range extender is located after startup, and the real-time water temperature represents the real-time temperature of the environment in which the range extender is located. The limit determination module is used to determine the maximum power generation and maximum torque rise rate of the range extender based on the initial start-up water temperature and the real-time water temperature. The step of determining the maximum power generation and maximum torque rise rate of the range extender based on the initial start-up water temperature and the real-time water temperature includes: determining the corresponding real-time power generation as the maximum power generation of the range extender based on the initial start-up water temperature and the real-time water temperature; and determining the corresponding real-time torque rise rate as the maximum torque rise rate of the range extender based on the real-time water temperature. The control module is used to control the range extender of the target vehicle to generate electricity based on the maximum power output and the maximum torque increase rate.

8. A vehicle control device, characterized in that, The vehicle control device includes a memory and a processor. The memory stores a computer program that can run on the processor. When the computer program is executed by the processor, it implements the steps of the vehicle control method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a vehicle control program, which, when executed by a processor, implements the steps of the vehicle control method as described in any one of claims 1 to 6.

Images