Control method and device for rapid reduction of electric quantity of extended-range electric vehicle and extended-range electric vehicle

Abstract

The invention relates to the technical field of extended-range electric vehicles, and provides a control method and device for rapid reduction of electric quantity of an extended-range electric vehicle and the extended-range electric vehicle. The method comprises the following steps: monitoring whether a vehicle runs at a high speed in a preset electric quantity interval to cause rapid reduction of electric quantity, if so, determining a vehicle speed compensation power generation demand based on a vehicle running speed parameter, and determining requested power generation power of a generator according to the vehicle speed compensation power generation demand and a whole vehicle energy consumption demand; and controlling the generator to start power generation, and adjusting the generated power of the generator based on the requested generated power. The motor generation power is controlled according to the situation that the vehicle runs at a high speed in the preset electric quantity interval, so that the electric quantity descending speed of the power battery is delayed and maintained, and the driving feeling and satisfaction degree of a user are improved.

Description

Technical Field

[0001] The present application relates to the technical field of extended-range electric vehicles, and in particular to a control method and device for rapidly decreasing the power of an extended-range electric vehicle, and an extended-range electric vehicle. Background Art

[0002] In new energy vehicles equipped with power batteries, the vehicle will monitor the SOC (State of Charge, in electric vehicles, SOC is used to display the remaining power of the battery, also known as the battery power) of the power battery, and remind the user when the SOC of the power battery is low, so that the user can charge in time after receiving the low power reminder. However, the corresponding speed limits in different countries and regions around the world are different. For the vehicle use scenario where the power of the power battery drops rapidly at ultra-high speeds and the power cannot be maintained, there are no targeted reminders and control strategies.

[0003] Taking extended-range electric vehicles as an example, the balance between the amount of electricity generated by the generator and the amount of electricity consumed during driving (maximum vehicle speed range) has been considered in the early stages of the design of extended-range electric vehicles. However, due to the different speed limits on highways in different countries and regions, there is always a situation where the vehicle speed is greater than the calibrated maximum speed for maintaining power, and the amount of electricity consumed during driving is greater than the amount of electricity generated by the generator, making it impossible to maintain the power battery charge, resulting in a continuous decline in the power battery charge.

[0004] Therefore, when extended-range electric vehicles are driving at ultra-high speeds, the driving power is greater than the generating power, causing the power battery to drop rapidly. How to remind users and control power generation is a technical problem encountered in the current use of extended-range electric vehicles and needs to be solved urgently. Summary of the invention

[0005] In view of this, the embodiments of the present application provide a control method, device and extended-range electric vehicle for the rapid decline in power of an extended-range electric vehicle, so as to solve the technical problem that when the extended-range electric vehicle is driving at ultra-high speed, the driving power is greater than the power generation power, resulting in a rapid decline in the power of the power battery, and the vehicle does not provide user reminders and power generation power control for this situation.

[0006] A first aspect of an embodiment of the present application provides a method for controlling a rapid decrease in battery power of an extended-range electric vehicle, comprising: monitoring whether the vehicle has a situation in which the battery power of the vehicle drops rapidly due to high-speed driving in a preset battery power interval, the preset battery power interval being at least one battery power interval pre-divided by the battery power range of the vehicle's power battery; if the vehicle has a situation in which the battery power of the vehicle drops rapidly due to high-speed driving in the preset battery power interval, determining a speed compensation power generation demand based on a vehicle driving speed parameter, and determining a requested power generation power of the generator based on the speed compensation power generation demand and the energy consumption demand of the entire vehicle; controlling the generator to start power generation, and adjusting the power generation power of the generator based on the requested power generation power.

[0007] According to a second aspect of an embodiment of the present application, there is provided a control device for a rapid decrease in battery power of an extended-range electric vehicle, comprising: a battery monitoring module configured to monitor whether the vehicle is in a situation where the battery power is rapidly decreasing due to high-speed driving in a preset battery interval, the preset battery interval being at least one battery power interval pre-divided by the battery power range of the vehicle's power battery; a strategy matching module configured to determine a speed compensation power generation demand based on a vehicle driving speed parameter if the vehicle is in a situation where the battery power is rapidly decreasing due to high-speed driving in the preset battery interval, and to determine a requested power generation power of the generator based on the speed compensation power generation demand and the energy consumption demand of the entire vehicle; and a strategy response module configured to control the generator to start power generation, and to adjust the power generation power of the generator based on the requested power generation power.

[0008] According to a third aspect of an embodiment of the present application, there is provided an extended-range electric vehicle, comprising a vehicle controller and a battery management system, wherein the vehicle controller is connected to the battery management system and comprises at least a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0009] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the above-mentioned method for controlling the rapid decline in battery power of an extended-range electric vehicle monitors whether the vehicle is driving at high speed in a preset battery range, resulting in a rapid decline in battery power, wherein the preset battery range is at least one battery power range pre-divided by the battery power range of the vehicle's power battery; if the vehicle is driving at high speed in the preset battery range, resulting in a rapid decline in battery power, the speed compensation power generation demand is determined based on the vehicle driving speed parameters, and the requested power generation power of the generator is determined based on the speed compensation power generation demand and the energy consumption demand of the whole vehicle; the generator is controlled to start power generation, and the power generation power of the generator is adjusted based on the requested power generation power, so as to carry out targeted motor power generation power control, thereby delaying and maintaining the power decline speed of the power battery, and improving the user's driving experience and satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying any creative work.

[0011] Figure 1 It is a flow chart of a method for controlling a rapid decrease in power of an extended-range electric vehicle provided in an embodiment of the present application;

[0012] Figure 2is a relationship diagram between the SOC decrease percentage compensation value coefficient and the SOC decrease value provided in an embodiment of the present application;

[0013] Figure 3 It is a schematic diagram of a user reminder and target power generation control strategy flow in an application scenario of an embodiment of the present application;

[0014] Figure 4 It is a structural schematic diagram of a control device for rapid power reduction of a range-extended electric vehicle provided in an embodiment of the present application;

[0015] Figure 5 It is a partial structural schematic diagram of a range-extended electric vehicle provided in an embodiment of the present application;

[0016] Figure 6 It is a structural schematic diagram of a vehicle controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0017] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0018] See also Figure 1 In a first embodiment of the present application, a method for controlling rapid power reduction of an extended-range electric vehicle is provided, comprising the following steps:

[0019] S101, monitoring whether the vehicle is running at high speed in a preset power range, resulting in a rapid decrease in power, where the preset power range is at least one battery power range pre-divided by a battery power range of a power battery of the vehicle;

[0020] S102, if the vehicle is traveling at a high speed in a preset power range, resulting in a rapid decrease in power, determining a speed compensation power generation demand based on the vehicle speed parameter, and determining a requested power generation power of the generator according to the speed compensation power generation demand and the vehicle energy consumption demand;

[0021] S103, controlling the generator to start power generation, and adjusting the power generation power of the generator based on the requested power generation power.

[0022] This embodiment monitors the battery power of the vehicle. When the vehicle is running at high speed in a preset power range and the power drops rapidly, the speed compensation power generation demand is determined based on the vehicle speed parameters. The requested power generation power of the generator is determined according to the speed compensation power generation demand and the energy consumption demand of the whole vehicle, so as to carry out targeted motor power generation control, thereby delaying and maintaining the power drop speed of the power battery and improving the driving experience and satisfaction of the user.

[0023] Among them, the situation in which the vehicle's battery power drops rapidly due to high-speed driving in the preset power range is not the only one. That is to say, when the preset power range includes a battery power range, the vehicle may have a situation in which the battery power drops rapidly due to high-speed driving within the battery power range, or there may be multiple situations in which the battery power drops rapidly due to high-speed driving. If there are multiple situations, the above step S102 only responds to one of the situations, and other corresponding measures can be taken for other situations, including but not limited to issuing user reminders.

[0024] In an optional embodiment, the preset power interval includes a first battery power interval. In the above step S101, monitoring whether the vehicle is running at a high speed in the preset power interval, resulting in a rapid decrease in power, includes:

[0025] Detecting whether the vehicle meets a first rapid power reduction determination condition, where the first rapid power reduction determination condition includes: whether the average vehicle speed within a first preset time period is greater than or equal to a preset speed threshold, the power consumption exceeds the first power threshold, and the range extender is not started;

[0026] If the vehicle meets the first battery rapid decline determination condition, it is determined that the vehicle has a first situation of rapid battery decline, and whether the vehicle meets the second battery rapid decline determination condition, the second battery rapid decline determination condition including: whether the average vehicle speed within a second preset time period is greater than or equal to a preset speed threshold, and the range extender is started, wherein the second preset time period is a continuous time period including the first preset time period, and the second preset time period is greater than the first preset time period;

[0027] If the vehicle meets the second rapid battery reduction determination condition, it is determined that the vehicle has a second rapid battery reduction condition;

[0028] In a first situation where the battery power is rapidly decreasing, a user reminder corresponding to the first situation is displayed on a meter or screen of the vehicle;

[0029] In the second case where the battery power of the vehicle drops rapidly, step S102 is executed.

[0030] Specifically, the second preset duration is a continuous duration that includes the first preset duration, and the second preset duration is longer than the first preset duration, which means that the second preset time period must not only cover the first time period, but also exceed the first time period in total length. This can be illustrated by a specific time interval, such as 8:00 to 8:05 am and 8:00 to 8:10 am. If the former represents the first preset duration, that is, 5 minutes, and the latter represents the second preset duration, that is, 10 minutes, it can be seen that the latter not only includes the former, but is also longer.

[0031] In this embodiment, there are two situations in which the vehicle's battery power drops rapidly due to high-speed driving in the first battery power interval, namely, the first situation in which the vehicle's battery power drops rapidly and the second situation in which the battery power drops rapidly. Among them, the above step S102 is executed only when the vehicle's battery power drops rapidly in the second situation.

[0032] This embodiment uses two situations in which the battery power drops rapidly due to high-speed driving of the vehicle in the first battery power range to respectively perform user reminders and power generation control to delay and maintain the rate of decrease in the power battery power.

[0033] According to the above embodiment, in the second case where the battery power of the vehicle drops rapidly, the vehicle will regulate the requested power generation power of the generator, and the specific implementation method of the regulation is not unique.

[0034] In some optional embodiments, based on the vehicle speed parameters, the speed compensation power generation demand is determined, and according to the speed compensation power generation demand and the whole vehicle energy consumption demand, the requested power generation power of the generator is determined, including: respectively calculating a first speed difference between the calibrated maximum power-maintaining speed and the minimum speed, and a second speed difference between the actual driving speed and the minimum speed; based on the ratio of the first speed difference to the second speed difference, calculating a first product of the ratio and the SOC drop percentage compensation value coefficient, and using the first product as the speed compensation power generation demand, wherein the SOC drop percentage compensation value coefficient is linearly proportional to the SOC drop value of the vehicle power battery; calculating a second product of the first product multiplied by the drive request power, and adding the second product to the accessory request power to obtain the requested power generation power of the generator.

[0035] Specifically, see Figure 2, the SOC drop percentage compensation value coefficient is preferably a dynamic value that is linearly proportional to the SOC drop value of the vehicle power battery, and the SOC drop percentage compensation value coefficient can be determined according to the SOC drop value of the vehicle power battery. For example, when the SOC drop value is 1, K is 1.1; when the SOC drop value is 2, K is 1.2. For example, in an application scenario, when the vehicle is running at high speed in a preset power range, resulting in a rapid drop in power, the requested power generation of the generator can be calculated according to the formula Pr=Pc*K*(Vmax2-Vmin) / (Vmax1-Vmin)+Pa, where Pr represents the requested power generation, Vmax2 represents the actual driving speed, Vmax1 represents the calibrated maximum power conservation speed, Vmin represents the minimum speed, K represents the SOC drop percentage compensation value coefficient, and K is linearly proportional to the SOC drop value of the vehicle power battery, Pc represents the driving request power, and Pa represents the accessory request power.

[0036] In another optional embodiment, the preset power interval further includes a second battery power interval. In the above step S101, monitoring whether the vehicle is running at a high speed in the preset power interval, resulting in a rapid decrease in power, includes:

[0037] Detecting whether the vehicle meets a third rapid battery drop determination condition, where the third rapid battery drop determination condition includes: whether the average vehicle speed within a first preset time period is greater than or equal to a preset speed threshold, and the range extender is not started;

[0038] If the vehicle meets the third rapid battery reduction determination condition, it is determined that the vehicle has a third situation of rapid battery reduction, and whether the vehicle meets the fourth rapid battery reduction determination condition, the fourth rapid battery reduction determination condition including: whether the average vehicle speed within the first preset time period is greater than or equal to a preset speed threshold, the power consumption exceeds the second power threshold, and the range extender is not started;

[0039] If the vehicle satisfies the fourth rapid battery reduction determination condition, it is determined that the vehicle is experiencing a fourth rapid battery reduction situation.

[0040] The second power threshold is less than the first power threshold. In this embodiment, the rapid decrease in power caused by high-speed driving of the vehicle in the second battery power range is added to remind the user, so that the user can immediately understand the current power change of the vehicle.

[0041] Based on the first battery power range, the embodiment of the present application adds a second battery power range. If the battery power of the vehicle drops rapidly due to high-speed driving in the second battery power range, corresponding measures will also be taken.

[0042] Following the above optional embodiment, in an optional embodiment, after monitoring whether the vehicle is experiencing a situation where the battery power is rapidly decreasing due to high-speed driving in a preset battery range, the method further includes: when it is determined that the vehicle is experiencing a third situation where the battery power is rapidly decreasing, a third user reminder corresponding to the third situation is displayed on the vehicle's instrument or screen; when it is determined that the vehicle is experiencing a fourth situation where the battery power is rapidly decreasing, a fourth user reminder corresponding to the fourth situation is displayed on the vehicle's instrument or screen.

[0043] For another example, in yet another optional embodiment, the preset power interval includes a third battery power interval, wherein the first battery power interval, the second battery power interval and the third battery power interval are three consecutive mutually exclusive intervals; in the above step S101, monitoring whether the vehicle has a situation in which the power of the battery drops rapidly due to high-speed driving in the preset power interval includes:

[0044] Determine the current battery charge value:

[0045] If the battery power is less than or equal to the third power threshold, determining whether the average speed of the vehicle within the first preset time period is greater than or equal to the preset speed threshold, and if so, determining that the vehicle has a fifth situation of rapid power reduction;

[0046] If the battery power is less than or equal to the fourth power threshold, determining whether the average speed of the vehicle within the third preset time period is greater than or equal to the preset speed threshold, and if so, determining that the vehicle has a sixth situation of rapid power reduction;

[0047] If the battery power is less than or equal to the fifth power threshold, determine whether the average speed of the vehicle within the fourth preset time period is greater than or equal to the preset speed threshold. If so, determine that the vehicle has entered the seventh situation of rapid battery decline.

[0048] Specifically, the first battery power interval, the second battery power interval and the third battery power interval may cover the entire battery power range or a portion of the battery power range. For example, when three consecutive mutually exclusive intervals cover the entire battery power range, the first battery power interval, the second battery power interval and the third battery power interval may be three power intervals divided according to the battery power of 0%-100%; when three consecutive mutually exclusive intervals cover a portion of the battery power range, the first battery power interval, the second battery power interval and the third battery power interval are three power intervals divided according to the battery power of 0%-80%. For example, Figure 3 As shown, the first battery power interval is 30%-80%, the second battery power interval is 10%-30%, and the third battery power interval is 0-10%. The specific range of each battery power interval can be set according to the application scenario, and this application does not limit this.

[0049] The embodiment of the present application adds a third battery power interval to monitor whether the vehicle is speeding in the third battery power interval, resulting in a rapid decrease in battery power, so that corresponding measures are taken according to these situations to delay and maintain the rate of decrease in the power battery power.

[0050] Following the above optional embodiment, after monitoring whether the vehicle is running at high speed in the preset power range, resulting in a rapid decrease in power, the method further includes:

[0051] When it is determined that the vehicle has a fifth situation in which the battery power is rapidly decreasing, a fifth user reminder corresponding to the fifth situation is displayed on the instrument or screen of the vehicle;

[0052] When it is determined that the sixth situation of the vehicle power rapidly decreases, a sixth user reminder corresponding to the sixth situation is displayed on the vehicle instrument or screen, and the maximum operating power of some or all of the vehicle-mounted electrical equipment is limited;

[0053] When it is determined that the vehicle is experiencing the seventh situation of rapid battery decline, a seventh user reminder corresponding to the seventh situation is displayed on the vehicle's instrument or screen, and some or all of the vehicle's electrical equipment is disabled.

[0054] Among them, corresponding user reminders are made according to the rapid drop in battery power due to high-speed driving in different battery power ranges. In actual application scenarios, there is not only one way to remind users, including but not limited to displaying pop-up prompts on the vehicle display or instrument.

[0055] In an optional embodiment, following the above optional embodiment, when the battery power of the vehicle is in the third battery power range, if the vehicle is traveling at an ultra-high speed causing the battery power to drop rapidly, the method further includes:

[0056] Detect whether the vehicle is in charging state;

[0057] If it is detected that the vehicle is not in a charging state, jump to the step of determining the current battery power value;

[0058] If it is detected that the vehicle is in charging state, jump to the step of determining the current battery power value, and no longer display the pop-up prompt, and lift the disablement and maximum working power limit of some or all of the vehicle's electrical equipment, or lift the disablement of some or all of the vehicle's electrical equipment.

[0059] Specifically, the third battery power interval can be selected as a low power interval. For example, the third battery power interval is 0%-10%. At this time, it is monitored whether the vehicle is charged. If the vehicle is charged, the corresponding measures previously taken for the vehicle in the third battery power interval due to the rapid decline in battery power can be canceled to restore normal use of the vehicle.

[0060] Furthermore, in an optional embodiment, in the first case where the battery power of the vehicle drops rapidly, the method further includes:

[0061] Using the vehicle voice system, a voice confirmation prompt is issued to ask whether to switch the driving mode to the fuel priority mode;

[0062] When the voice response received is no, the current driving mode is kept unchanged;

[0063] When a voice response of yes is received, or when no voice response is received, the driving mode is switched to the fuel priority mode.

[0064] This embodiment interacts with the user through the vehicle's voice system, sends a corresponding voice confirmation prompt to the user, and requests the user to determine whether to switch the vehicle's current driving mode to take auxiliary response measures in the event of a rapid decrease in battery power, so as to delay and maintain the rate of decrease in the power battery power.

[0065] In a second embodiment of the present application, another method for controlling a rapid decrease in power of an extended-range electric vehicle is provided, comprising the following steps:

[0066] S201, obtaining the battery power of the power battery;

[0067] S202, determining a target battery power interval corresponding to the current battery power of the vehicle based on a plurality of battery power intervals pre-divided for the full range of battery power, the plurality of battery power intervals being mutually exclusive and exhaustive, and the target battery power interval being one of the plurality of battery power intervals;

[0068] S203, based on the preset rapid power reduction determination conditions of each battery power range, determining whether the battery power of the vehicle in the target battery power range is rapidly reducing, the rapid power reduction determination condition including at least one preset condition determined based on at least one data of the average vehicle speed, the range extender working state and the battery power change within at least one preset time period, and thresholds set for various data;

[0069] S204, when the battery level of the vehicle is rapidly decreasing, controlling the vehicle to execute a user reminder and a target power generation control strategy corresponding to a target battery power range.

[0070] In practical applications, the above-mentioned control method for rapid power reduction of an extended-range electric vehicle can be applied to the extended-range electric vehicle, and the method is executed by the vehicle controller of the extended-range electric vehicle.

[0071] The working principle of the control method for the rapid decline of the battery power of the above-mentioned extended-range electric vehicle is that: during the use of the vehicle, there is always a situation where the vehicle speed is greater than the calibrated maximum vehicle speed value, so that the power consumption of driving is greater than the power generated by the generator, and the power of the power battery cannot be maintained, resulting in a continuous decline in the power of the power battery until the balance point between the vehicle speed and the power output of the power battery is reached. Therefore, the above-mentioned control method provided in this embodiment delays and maintains the speed of decline of the power battery power by reminding the user and adjusting the power generated by the generator in a targeted manner when the average battery power decline percentage exceeds a certain value within a certain time range and in different power battery power interval value ranges, so as to improve the user's driving experience and satisfaction.

[0072] It can be seen that according to the control method for rapid power decline of the extended-range electric vehicle provided by the present embodiment, the battery power of the power battery is obtained; based on the multiple battery power intervals pre-divided into the full range of the battery power, the target battery power interval corresponding to the current battery power of the vehicle is determined, the multiple battery power intervals are mutually exclusive and exhaustive, and the target battery power interval is one of the multiple battery power intervals; based on the preset rapid power decline judgment conditions of each battery power interval, it is judged whether the battery power of the vehicle in the target battery power interval has a rapid power decline, and the rapid power decline judgment condition includes at least one data determined based on the average vehicle speed, the working state of the range extender and the battery power change of the vehicle within at least one preset time period, and the threshold value set for various data, and at least one preset condition; when the vehicle has a rapid power decline, the vehicle is controlled to execute the user reminder and target power generation control strategy corresponding to the target battery power interval, thereby realizing that within the full power range of the power battery, for different battery power intervals, the battery power decline of the vehicle within a certain time range is respectively targeted for user reminders and generator power generation control, thereby delaying and maintaining the power decline speed of the power battery, and improving the user's driving experience and satisfaction.

[0073] Specifically, after the above step S203, if the battery power of the vehicle does not decrease rapidly, the process returns to step S201 to loop through the above method steps.

[0074] In the above step S201, the battery charge refers to the SOC of the power battery. In the extended-range electric vehicle, BMS (abbreviation of Battery Management System, translated as battery management system) is generally used as the core control system of the power battery, which is responsible for collecting and processing data from various sensors in the power battery, including but not limited to the battery charge (SOC). For example, in an optional embodiment, the vehicle controller of the extended-range electric vehicle is connected to the battery management system via the CAN bus, and the battery management system is used to collect and calculate the battery charge of the power battery, and then the battery management system sends the SOC data to the vehicle controller via the CAN bus.

[0075] In the above step S202, the full range of battery power refers to the battery power from 0%-100%, and the battery power from 0%-100% is divided into multiple battery power intervals. Multiple battery power intervals are mutually exclusive, which means that there is no overlap between each battery power interval, that is, any power value at the same time can only belong to one interval; and multiple battery power intervals are exhaustive, which means that all battery power intervals cover the entire power range from 0% to 100%, that is, no power value falls outside the interval. Specifically, the number of divided battery power intervals can be two, three, four or more than four. It should be noted that the divided battery power intervals can be equal-length intervals, that is, the range of each interval is equal. For example, the battery power of 0%-100% is divided into 10 battery power intervals, and the range of each battery power interval is 10%. Alternatively, the divided battery power intervals can also be unequal-length intervals, that is, the range of each interval is different. For example, 0%-100% is divided into three battery power intervals, the first interval may be 0%-20%, the second interval is 20%-50%, and the third interval is 50%-100%. Of course, among the multiple battery power intervals divided, some of the battery power intervals may be equal-length intervals, while other parts of the battery power intervals may be unequal-length intervals. For example, 0%-100% is divided into four battery power intervals, the first interval is 100% ≥ SOC ≥ 80%, the second interval is 80% ≥ SOC > 30%, the third interval is 30% ≥ SOC > 10%, and the fourth interval is 10% ≥ SOC ≥ 0%. In practice, the range size of each divided battery power interval can be set by the specific application scenario, and the embodiments of the present application do not limit this.

[0076] In an optional embodiment, the battery power of the power battery can be divided into four intervals, which are the first battery power interval, the second battery power interval, the third battery power interval and the fourth battery power interval. Among them, the ranges of the first battery power interval, the second battery power interval, the third battery power interval and the fourth battery power interval increase in sequence. For example, the range of the first battery power interval is 100% ≥ SOC ≥ 80%, the range of the second battery power interval is 80% ≥ SOC > 30%, the range of the third battery power interval is 30% ≥ SOC > 10%, and the range of the fourth battery power interval is 10% ≥ SOC ≥ 0%.

[0077] In practice, the higher the battery power of the power battery, the less obvious the impact on the user's driving experience, even if the battery power drops quickly. On the contrary, the lower the battery power of the power battery, if the driving consumes a lot of power, resulting in a rapid drop in battery power, the more obvious the impact on the user's driving experience. Therefore, the embodiment of the present application has different conditions for determining the rapid drop in battery power in each divided battery power interval. The following is a detailed description of the conditions for determining the rapid drop in battery power in each divided battery power interval.

[0078] Among them, the conditions for determining a rapid decrease in power are not unique, but in this embodiment, it is aimed at the scenario where the driving power of the extended-range electric vehicle is greater than the generated power, resulting in a rapid decrease in the power of the power battery. Therefore, based on at least one data of the average vehicle speed, the working status of the range extender and the battery power change within at least one preset time period, and the thresholds set for various data, at least one preset condition is determined, and the conditions for determining a rapid decrease in power for each divided battery power interval include at least one of the preset conditions. If the conditions for determining a rapid decrease in power for a divided battery power interval include two or more preset conditions, then each preset condition corresponds to a different degree of battery power decrease in turn.

[0079] In an optional embodiment, in step S203, based on the preset rapid power drop determination conditions of each battery power interval, it is determined whether the battery power of the vehicle in the target battery power interval has a rapid power drop, including:

[0080] When the target battery power interval corresponding to the battery power is the first battery power interval, determining that the battery power of the vehicle does not drop rapidly, and returning to the step of obtaining the battery power of the power battery;

[0081] When the target battery power interval corresponding to the battery power is the second battery power interval, detecting whether the vehicle meets the first battery power rapid decline determination condition, the first battery power rapid decline determination condition includes: whether the average vehicle speed within the first preset time is greater than or equal to the preset speed threshold, and the power consumption exceeds the first battery power threshold; the range extender is not started; if the vehicle meets the first battery power rapid decline determination condition, it is determined that the vehicle has a first situation of rapid decline in battery power, and detecting whether the vehicle meets the second battery power rapid decline determination condition, the second battery power rapid decline determination condition includes: whether the average vehicle speed within the second preset time is greater than or equal to the preset speed threshold, the second preset time and the first preset time are continuous time, and the second preset time is longer than the first preset time; the range extender is started; if the vehicle meets the second battery power rapid decline determination condition, it is determined that the vehicle has a second situation of rapid decline in battery power;

[0082] When the target battery power interval corresponding to the battery power is the third battery power interval, it is detected whether the vehicle meets the third rapid power reduction determination condition, and the third rapid power reduction determination condition includes: whether the average vehicle speed within the third preset time is greater than or equal to the preset speed threshold, and the range extender is not started; if the vehicle meets the third rapid power reduction determination condition, it is determined that the vehicle has a third situation of rapid power reduction, and whether the vehicle meets the fourth rapid power reduction determination condition, and the fourth rapid power reduction determination condition includes: whether the average vehicle speed within the fourth preset time is greater than or equal to the preset speed threshold, and the power consumption exceeds the second power threshold; the range extender is not started; if the vehicle meets the fourth rapid power reduction determination condition, it is determined that the vehicle has a fourth situation of rapid power reduction;

[0083] When the target battery power interval corresponding to the battery power is the fourth battery power interval, determine the current battery power value: if the battery power is less than or equal to the third power threshold, determine whether the average speed of the vehicle within the fifth preset time period is greater than or equal to the preset speed threshold, and if so, determine that the vehicle has experienced the fifth situation of rapid battery drop; if the battery power is less than or equal to the fourth power threshold, determine whether the average speed of the vehicle within the sixth preset time period is greater than or equal to the preset speed threshold, and if so, determine that the vehicle has experienced the sixth situation of rapid battery drop; if the battery power is less than or equal to the fifth power threshold, determine whether the average speed of the vehicle within the seventh preset time period is greater than or equal to the preset speed threshold, and if so, determine that the vehicle has experienced the seventh situation of rapid battery drop.

[0084] Specifically, in the scenario of the first battery power interval, since the battery power range in the first battery power interval is the highest, the battery power is relatively high. Even if there is a rapid drop in power in a short period of time, the battery still has enough power to maintain the vehicle's driving needs. Therefore, no matter what power mode the vehicle is currently in, there is no need for prompts or generator power adjustments. It can be seen that when the power battery is at a high level, it can withstand a rapid drop in power in a short period of time without the need for emergency prompts or generator power control. This control strategy optimizes energy management, improves the driving experience, and ensures the efficient operation of the vehicle's power system.

[0085] In the second battery power interval scenario, the speed threshold can be a fixed speed value or a speed value determined according to the speed limit requirements of different countries. In addition, the first preset duration and the second preset duration are two specific duration values ​​within a period of time, and the second preset duration is longer than the first preset duration. For example, the first rapid decrease in power determination condition is: the average speed of the vehicle is >150kph (abbreviation of kilometers per hour) within 5 minutes, and the SOC decreases ≥10%, and the range extender is not started; in addition, the second rapid decrease in power determination condition is: the average speed of the vehicle is >150kph within 10 minutes, and the range extender is started. In this example, the first preset duration is 5 minutes, the second preset duration is 10 minutes, the first power threshold is 10%, and the speed threshold is 150kph. Of course, the first preset duration, the second preset duration, the speed threshold and the first power threshold can also be other values, and are not limited to the example values ​​in this example. In addition, the range extender may not be started because the vehicle is not started due to the power mode currently set, or it may be unable to start because the vehicle has no oil or the range extender is abnormal. The embodiments of the present application are not limited to this.

[0086] In the scenario where the battery power is in the third battery power interval, the second power threshold is less than the first power threshold. This is because the range of the third battery power interval is lower than the range of the second battery power area, and the battery power in the third battery power interval is lower. When the vehicle is driving at high speed, the allowable degree of SOC drop of the power battery is lower. For example, the third rapid power drop judgment condition is: the average speed of the vehicle within 5 minutes is greater than 150kph, and the power battery SOC drops by ≥5%, and the range extender is not started; in addition, the fourth rapid power drop judgment condition is: the average speed of the vehicle within 5 minutes is greater than 150kph, and the range extender is started. In this example, the second power threshold is 5%, and the third preset time and the fourth preset time are 5 minutes, that is, the third preset time and the fourth preset time are less than or equal to the second preset time. In practice, the third preset time and the fourth preset time can be the same or different. In addition, the speed threshold corresponding to the average vehicle speed is the same as the scenario of the above-mentioned battery power interval, which will not be repeated here.

[0087] In the scenario where the battery power is in the fourth battery power interval, the battery power is the lowest. At this time, the power battery cannot support the vehicle to travel at high speed for a long time. Therefore, the fifth preset time, the sixth preset time and the seventh preset time should be less than or equal to the fourth preset time, and the fifth preset time, the sixth preset time and the seventh preset time decrease in sequence. In addition, the third power threshold, the fourth power threshold and the fifth power threshold are different power values ​​in the fourth battery power interval, and the third power threshold, the fourth power threshold and the fifth power threshold gradually decrease. The size can be set according to the application scenario, and there is no restriction here. For example, when the battery power is in the fourth battery power interval, the fifth power rapid decline judgment condition is: 5% < SOC ≤ 10%, and the average speed of the vehicle within 5 minutes is > 150kph; the sixth power rapid decline judgment condition is: 3% < SOC ≤ 5%, and the average speed of the vehicle within 3 minutes is > 150kph; the seventh power rapid decline judgment condition is: SOC ≤ 3%, and the average speed of the vehicle within 1 minute is > 140kph. In this example, the third power threshold may be 10%, the fourth power threshold may be 5%, and the fifth power threshold may be 3%. The fifth preset time length, the sixth preset time length, and the seventh preset time length are 5 minutes, 3 minutes, and 1 minute, respectively.

[0088] In combination with the above optional embodiments, it can be known that when the vehicle battery power is in the different battery power intervals, there are many situations in which the power drops rapidly. Accordingly, the countermeasures for each situation of rapid power drop are also different. The countermeasures for various situations of rapid power drop will be described in detail below.

[0089] In an optional embodiment, in the above step S204, when the battery power of the vehicle is rapidly decreasing, the vehicle is controlled to execute a user reminder and a target power generation control strategy corresponding to the target battery power range, including:

[0090] When it is determined that the battery level of the vehicle is rapidly decreasing, a first pop-up box prompt is displayed on the vehicle's instrument panel or screen;

[0091] When it is determined that the vehicle has a second situation where the battery power is rapidly decreasing, the target power control strategy is used to control the power generation power of the generator. The target power generation control strategy includes calculating the requested power generation power of the generator using the following calculation formula:

[0092] Pr=Pc*K*(V max 2-V min ) / (V max1 -V min )+Pa, where Pr represents the requested power generation, V max2 Indicates the actual vehicle speed, V max1Indicates the rated maximum power-maintaining vehicle speed, V min represents the minimum vehicle speed, K represents the SOC decrease percentage compensation coefficient, and K is linearly proportional to the SOC decrease value, Pc represents the driving request power, and Pa represents the accessory request power;

[0093] A secondary pop-up prompt is displayed on the vehicle's instrument panel or screen.

[0094] Specifically, there are many ways to display the first pop-up window prompt, including but not limited to repeatedly displaying the first pop-up window prompt at intervals, or displaying the first pop-up window prompt within a fixed time. Similarly, the way to display the first pop-up window prompt is the same, which will not be repeated here.

[0095] The specific contents of the first pop-up box prompt and the second pop-up box prompt may be the same or different. In this embodiment, the contents of the pop-up box prompt displayed on the meter or display screen may be different in different situations where the battery power is rapidly decreasing.

[0096] For example, combined with Figure 2 In some extended-range electric vehicles, if the vehicle encounters the first situation where the battery power drops rapidly, the vehicle controller sends a first signal that the power battery power drops too quickly. After receiving the first signal, the instrument controller will continue to display a pop-up window for 5 seconds: When driving on pure electric power, the vehicle speed is too high, the battery power drops too quickly, and it is recommended that the vehicle speed be controlled within 140kph (in practice, it can also be other speed values ​​<150kph); if the vehicle continues to meet the first situation, it will be prompted once every 3 minutes: When driving on pure electric power, the vehicle speed is too high, the battery power drops too quickly, and it is recommended that the vehicle speed be controlled within 140kph. In addition, if the vehicle encounters the second situation where the battery power drops rapidly, the vehicle controller sends the target power generation control strategy to the generator controller (i.e., Generator Control Unit, abbreviated as GCU). The target power generation control strategy includes the formula for calculating the requested power generation power: Pr = Pc*K*(V max 2-V min ) / (V max1 -V min )+Pa to increase the GCU power generation request power in advance; at the same time, the vehicle controller sends a second signal that the power battery power is decreasing too quickly. After receiving the second signal, the instrument controller will continue to prompt for 5 seconds: the vehicle speed is too high, the power generation cannot maintain the battery power, and it is recommended to control the vehicle speed within 140kph. Among them, when the vehicle continues to meet the second situation of rapid power decline, it will be prompted once every 10 minutes: the vehicle speed is too high, the power generation cannot maintain the battery power, and it is recommended to control the vehicle speed within 140kph.

[0097] In the above formula for calculating the requested power generation, the coefficient K value is obtained through internal calibration and actual vehicle verification. Of course, there may be deviations in practice. Figure 3, is the relationship between the SOC decrease percentage compensation value coefficient K and the SOC decrease value, such as Figure 3 As shown, the SOC decrease value is linearly proportional to the coefficient K, that is, the lower the SOC, the higher the K value.

[0098] Furthermore, when the vehicle does not meet the second condition of rapid power decline, the generator controller may request the power generation to be restored to the original power generation strategy. The original power generation strategy may be any power generation strategy of the generator controller. Considering that the original power generation strategy is not a contribution of the present application to the prior art, the present application embodiment does not limit the content of the original power generation strategy.

[0099] In some optional embodiments, when it is determined that the second situation of rapid battery power decline occurs in the vehicle, the vehicle is controlled to execute a user reminder and a target power generation control strategy corresponding to the target battery power range, further comprising:

[0100] Using the vehicle voice system, a voice confirmation prompt is issued to ask whether to switch the driving mode to the fuel priority mode;

[0101] When the voice response received is no, the current driving mode is kept unchanged;

[0102] When a voice response of yes is received, or when no voice response is received, the driving mode is switched to the fuel priority mode.

[0103] Specifically, in an extended-range electric vehicle, when the vehicle encounters the second situation where the battery power drops rapidly, the cockpit controller receives the second signal from the vehicle controller that the battery power of the power battery drops too quickly. Based on the onboard voice system, the user is prompted by voice that the current vehicle speed is high and the battery power is dropping rapidly. Should the user switch the vehicle mode to the fuel priority mode to improve drivability? If the user answers: No, the vehicle mode remains unchanged; if the user does not answer or answers: Yes, the cockpit controller sends the fuel priority mode to the vehicle controller, and the vehicle controller controls the vehicle driving mode to the fuel priority mode. After receiving the vehicle driving mode setting from the vehicle controller, the cockpit controller displays the fuel priority mode. In practice, in order to avoid repeated voice prompts when the vehicle continuously meets the second situation where the battery power drops rapidly, the above voice prompt is only performed once in each driving cycle.

[0104] This embodiment provides the user with the operation of switching the vehicle driving mode through voice confirmation prompts, so that the driver can choose whether to switch the driving mode according to real-time needs, thereby improving the operational flexibility and control of the vehicle driving mode control when the battery power drops rapidly, ensuring that the vehicle can be adjusted to the most appropriate driving mode in time in the second situation where the battery power drops rapidly, thereby improving the intelligence level of vehicle control.

[0105] In some optional embodiments, in the above step S204, when the battery power of the vehicle is rapidly decreasing, the vehicle is controlled to execute a user reminder and a target power generation control strategy corresponding to the target battery power range, including:

[0106] When it is determined that the vehicle is in the third situation of rapid battery decline, a third pop-up prompt is displayed on the vehicle's instrument or screen;

[0107] When it is determined that the fourth situation of the rapid decrease in the battery power of the vehicle occurs, the target power control strategy is used to control the power generation power of the generator. The target power generation control strategy includes calculating the requested power generation power of the generator using the following calculation formula:

[0108] Pr=Pc*K*(V max 2-V min ) / (V max1 -V min )+Pa, where Pr represents the requested power generation, V max2 Indicates the actual vehicle speed, V max1 Indicates the rated maximum power-maintaining vehicle speed, V min represents the minimum vehicle speed, K represents the SOC decrease percentage compensation coefficient, and K is linearly proportional to the SOC decrease value, Pc represents the driving request power, and Pa represents the accessory request power;

[0109] A fourth pop-up prompt is displayed on the vehicle's instrument or screen.

[0110] Specifically, there are various ways to display the third and fourth pop-up prompts on the instrument or screen, including but not limited to repeatedly displaying the first pop-up prompt at intervals, or displaying the first pop-up prompt for a fixed duration. Moreover, the specific contents of the third and fourth pop-up prompts may be the same or different, and the embodiments of the present application do not limit this.

[0111] For example, combined with Figure 2 For example, in some extended-range electric vehicles, when the vehicle encounters the third situation of rapid battery decline, the vehicle controller sends a third signal that the power battery is declining too quickly. After receiving the third signal, the instrument controller will continue to prompt for 5 seconds: During pure electric driving, the battery is low, the vehicle speed is too high, and the range extender cannot be started. It is recommended to control the vehicle speed within 100kph; and, if the vehicle continues to meet the third situation of rapid battery decline, it will prompt once every 1 minute: During pure electric driving, the vehicle speed is too high, the battery is declining too quickly, and it is recommended to control the vehicle speed within 100kph. In addition, when the vehicle encounters the fourth situation of rapid battery decline, the vehicle control adjusts the generator controller's power generation request power as follows: Pr = Pc*K*(V max 2-V min ) / (V max1 -Vmin )+Pa; and, the vehicle controller sends out a fourth signal indicating that the power battery is decreasing too quickly. After receiving the fourth signal, the instrument controller will continue to display a pop-up window for 5 seconds: the vehicle speed is too high, the power generation cannot maintain the battery power, and it is recommended that the vehicle speed be controlled within 140 kph. Similarly, when the vehicle continues to meet the fourth condition of rapid power decrease, it will be prompted once every 3 minutes: the vehicle speed is too high, the power generation cannot maintain the battery power, and it is recommended that the vehicle speed be controlled within 140 kph.

[0112] This embodiment detects the rapid decline in power, calculates and adjusts the generator power according to a specific algorithm, and displays corresponding prompts to the driver, thereby providing an intelligent, timely and efficient power management and reminder mechanism, thereby improving the safety and energy efficiency of the vehicle.

[0113] In some optional embodiments, in the above step S204, when the battery power of the vehicle is rapidly decreasing, the vehicle is controlled to execute a user reminder and a target power generation control strategy corresponding to the target battery power range, including:

[0114] When it is determined that the fifth situation of rapid decrease in battery power of the vehicle occurs, a fifth pop-up box prompt is displayed on the vehicle instrument or screen; some or all of the on-board electrical equipment is disabled, and / or the maximum working power of some or all of the on-board electrical equipment is limited; the target power control strategy is used to control the power generation of the generator, and the target power generation control strategy includes calculating the requested power generation of the generator using the following calculation formula:

[0115] Pr=Pc*K*(V max 2-V min ) / (V max1 -V min )+Pa, where Pr represents the requested power generation, V max2 Indicates the actual vehicle speed, V max1 Indicates the rated maximum power-maintaining vehicle speed, V min represents the minimum vehicle speed, K represents the SOC decrease percentage compensation coefficient, and K is linearly proportional to the SOC decrease value, Pc represents the driving request power, and Pa represents the accessory request power;

[0116] When it is determined that the sixth situation of rapid decrease in battery power of the vehicle occurs, a sixth pop-up box prompt is displayed on the vehicle instrument or screen, some or all of the on-board electrical equipment is disabled, and / or the maximum working power of some or all of the on-board electrical equipment is limited; the target power control strategy is used to control the power generation of the generator, and the target power generation control strategy includes calculating the requested power generation of the generator using the following calculation formula:

[0117] Pr=Pc*K*(V max 2-V min ) / (Vmax1 -V min )+Pa, where Pr represents the requested power generation, V max2 Indicates the actual vehicle speed, V max1 Indicates the rated maximum power-maintaining vehicle speed, V min represents the minimum vehicle speed, K represents the SOC decrease percentage compensation coefficient, and K is linearly proportional to the SOC decrease value, Pc represents the driving request power, and Pa represents the accessory request power;

[0118] When it is determined that the seventh situation of rapid decrease in battery power of the vehicle occurs, a seventh pop-up box prompt is displayed on the vehicle instrument or screen, some or all of the on-board electrical equipment is disabled, and / or the maximum working power of some or all of the on-board electrical equipment is limited; the target power control strategy is used to control the power generation of the generator, and the target power generation control strategy includes calculating the requested power generation of the generator using the following calculation formula:

[0119] Pr=Pc*K*(V max 2-V min ) / (V max1 -V min )+Pa, where Pr represents the requested power generation, V max2 Indicates the actual vehicle speed, V max1 Indicates the rated maximum power-maintaining vehicle speed, V min represents the minimum vehicle speed, K represents the SOC decrease percentage compensation coefficient, and K is linearly proportional to the SOC decrease value, Pc represents the driving request power, and Pa represents the accessory request power.

[0120] Specifically, compared with other situations where the power is rapidly decreasing, this embodiment adds a maximum operating power limit and disablement control for the electrical equipment on the vehicle. Therefore, the display methods of the fifth, sixth and seventh pop-up boxes in this embodiment can refer to the above embodiments and will not be repeated here.

[0121] Among them, since the power range of the fourth battery power interval is the lowest, when the battery power of the vehicle meets the fourth battery power interval, the vehicle generally prompts the user to charge the power battery to restore and improve the power battery.

[0122] Furthermore, in an optional embodiment, when the battery level of the vehicle is rapidly decreasing, controlling the vehicle to execute a user reminder and a target power generation control strategy corresponding to a target battery power range further includes:

[0123] Detect whether the vehicle is in charging state;

[0124] If it is detected that the vehicle is not in a charging state, jump to the step of determining the current battery power value;

[0125] If it is detected that the vehicle is in charging state, the process will jump to the step of determining the current battery power value, and the pop-up prompt will no longer be displayed, and the disabling and maximum operating power limit of some or all of the vehicle's electrical devices will be lifted;

[0126] Determine the current battery charge value, including:

[0127] If the battery power level is greater than the third power level threshold, the process returns to the step of determining a target battery power level interval corresponding to the current battery power level of the vehicle based on a plurality of battery power level intervals pre-divided into the full range of battery power levels.

[0128] This embodiment detects whether the power battery is being supplemented by adding a determination of the state of the charging plug on the vehicle. If the power battery is being supplemented, the battery power of the power battery will gradually increase, thereby changing the battery power. After the power change, the battery power range corresponding to the battery power of the vehicle and the determination of the situation of rapid power decline will also change accordingly, thereby making the control of the rapid decline of vehicle power more perfect.

[0129] For example, combined with Figure 2 For example, in some extended-range electric vehicles, if the battery power of the vehicle meets the conditions: 5%<SOC≤10%, and the average vehicle speed within 5 minutes is>150kph and the vehicle is not plugged in; then the vehicle is determined to have a fifth situation of rapid power decline. At this time, the vehicle controller continues to send a fifth signal of low battery power, and after receiving the fifth signal, the instrument controller continues to pop up a window to prompt: the battery power is low and the vehicle is about to stop working; if the SOC≥12% or the plug is plugged in to enter the charging state, there will be no prompt or power restriction; at the same time, the vehicle controller limits the maximum available power of the air conditioning controller AC (abbreviation of Air Conditioning, translated as refrigeration and air conditioning system) to 1kw, and the available power of the passenger compartment PTC (abbreviation of Positive Temperature Coefficient, translated as electric heater) is 0kw; in addition, the range extender is adjusted to a startable state, and the target power generation control strategy of adjusting the generator is the same as the other rapid power decline situations mentioned above, which will not be repeated here.

[0130] If the battery charge of the vehicle meets the following conditions: 3%<SOC≤5%, and the average vehicle speed within 3 minutes is>150kph and the vehicle is not plugged in; then the vehicle is determined to have the sixth situation of rapid battery drop, and the vehicle controller continues to send the sixth signal of extremely low battery charge, and the instrument controller receives the sixth signal and continuously pops up a window to remind: the battery charge is low and the vehicle is about to stop working; and the vehicle controller limits the maximum AC power available to the air-conditioning controller to 1kw and the PTC power available to the passenger compartment to 0kw; in addition, if the battery charge is plugged in and enters the charging state, there will be no prompt or power limit; if the battery charge rises to the range of 12≥SOC≥7%, there will be a continuous prompt: the battery charge is low and the vehicle is about to stop working, and the power limit is the same as above; in addition, the range extender is adjusted to a startable state, and the target power generation control strategy of adjusting the generator is the same as the other rapid battery drop situations mentioned above, which will not be repeated here.

[0131] If the battery charge of the vehicle meets the following conditions: SOC≤3%, and the average vehicle speed within 1 minute is >140kph and the vehicle is not plugged in; then the vehicle is determined to have the seventh situation of rapid battery drop. At this time, the vehicle controller continues to send the seventh signal that the battery charge is extremely low, and the instrument controller receives the seventh signal and continuously displays a pop-up window prompting: the battery charge is low and the vehicle is about to stop working; and the vehicle controller limits the maximum available power of the air-conditioning controller AC to 1kw and the available power of the passenger compartment PTC to 0kw; in addition, once it is detected that the charging state has been entered by plugging in the battery, there will be no prompt or power limit; and when the battery charge rises to 7>SOC≥5%, there will be a continuous prompting: the battery charge is extremely low and the vehicle is about to stop working, and the power limit is the same as above; in addition, the range extender is adjusted to a startable state, and the target power generation control strategy of adjusting the generator is the same as the other rapid battery drop situations mentioned above, which will not be repeated here.

[0132] Specifically, for the target power generation control strategy, according to the calculation formula provided in this embodiment: Pr = Pc*K*(V max 2-V min ) / (V max1 -V min )+Pa, the calculation process is: (V max 2-V min ) and (V max1 -V min ) is used to calculate the ratio of the current vehicle speed to the calibrated maximum power-maintaining speed. K is used as the SOC drop compensation coefficient and changes with the SOC drop value. The lower the SOC, the higher the K value. Finally, the calculated ratio is multiplied by the drive request power Pc and added to the accessory request power Pa to obtain the requested power generation power Pr.

[0133] This embodiment provides users with relevant reminders and power generation control strategies when the power battery of the extended-range electric vehicle drops rapidly in a scenario where the driving power is greater than the power generation power, thereby improving the user's driving experience and user satisfaction.

[0134] All the above optional technical solutions can be arbitrarily combined to form optional embodiments of the present application, which will not be described one by one here.

[0135] The following is an embodiment of the device of the present application, which can be used to execute the embodiment of the method of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method of the present application.

[0136] See also Figure 4 In a third embodiment of the present application, a control device for a rapid decrease in power of an extended-range electric vehicle is provided, comprising:

[0137] The power monitoring module 401 is configured to monitor whether the vehicle has a situation where the power drops rapidly due to high-speed driving in a preset power interval, and the preset power interval is at least one battery power interval divided by the battery power range of the vehicle power battery in advance;

[0138] The strategy matching module 402 is configured to determine the speed compensation power generation demand based on the vehicle speed parameter if the vehicle is traveling at a high speed in a preset power range, resulting in a rapid decrease in power, and determine the requested power generation power of the generator according to the speed compensation power generation demand and the vehicle energy consumption demand;

[0139] The strategy response module 403 is configured to control the generator to start power generation and adjust the power generation of the generator based on the requested power generation.

[0140] According to the technical solution provided in the embodiment of the present application, by monitoring the battery power of the vehicle, when the vehicle is driving at high speed in a preset power range and the power level drops rapidly, the speed compensation power generation demand is determined based on the vehicle driving speed parameters, and the requested power generation power of the generator is determined based on the speed compensation power generation demand and the energy consumption demand of the whole vehicle, so as to carry out targeted motor power generation control, thereby delaying and maintaining the power reduction rate of the power battery, and improving the driving experience and satisfaction of the user.

[0141] In some optional embodiments, the preset power interval includes a first battery power interval; the power monitoring module 401 is configured to detect whether the vehicle meets the first rapid power drop determination condition, and the first rapid power drop determination condition includes: whether the average vehicle speed within the first preset time is greater than or equal to the preset speed threshold, the power consumption exceeds the first power threshold, and the range extender is not started; if the vehicle meets the first rapid power drop determination condition, it is determined that the vehicle has a first situation of rapid power drop, and whether the vehicle meets the second rapid power drop determination condition, and the second rapid power drop determination condition includes: whether the average vehicle speed within the second preset time is The speed is greater than or equal to a preset speed threshold and the range extender is started, wherein the second preset time length is a continuous time length including the first preset time length, and the second preset time length is greater than the first preset time length; if the vehicle meets the second rapid battery drop determination condition, it is determined that the vehicle has a second situation of rapid battery drop; in the first situation of rapid battery drop in the vehicle, a user reminder corresponding to the first situation is displayed on the vehicle's instrument or screen; in the second situation of rapid battery drop in the vehicle, the steps of: determining the speed compensation power generation demand based on the vehicle driving speed parameters, and determining the requested power generation power of the generator according to the speed compensation power generation demand and the vehicle energy consumption demand.

[0142] In some optional embodiments, the preset power interval includes a second battery power interval; the above-mentioned power monitoring module 401 is configured to detect whether the vehicle meets the third rapid power drop judgment condition, and the third rapid power drop judgment condition includes: whether the average vehicle speed within the first preset time period is greater than or equal to the preset speed threshold, and the range extender is not started; if the vehicle meets the third rapid power drop judgment condition, it is determined that the vehicle has a third situation of rapid power drop, and whether the vehicle meets the fourth rapid power drop judgment condition, the fourth rapid power drop judgment condition includes: whether the average vehicle speed within the first preset time period is greater than or equal to the preset speed threshold, the power consumption exceeds the second power threshold, and the range extender is not started; if the vehicle meets the fourth rapid power drop judgment condition, it is determined that the vehicle has a fourth situation of rapid power drop.

[0143] In some optional embodiments, the control device for rapid power reduction of the above-mentioned extended-range electric vehicle further includes:

[0144] The first reminder module 404 is configured to display a third user reminder corresponding to the third situation on the vehicle's instrument or screen when it is determined that the vehicle's battery power is rapidly decreasing in the third situation; and to display a fourth user reminder corresponding to the fourth situation on the vehicle's instrument or screen when it is determined that the vehicle's battery power is rapidly decreasing in the fourth situation.

[0145] In some optional embodiments, the preset power interval includes a third battery power interval, wherein the first battery power interval, the second battery power interval and the third battery power interval are mutually exclusive intervals; the power monitoring module 401 is configured to determine the current battery power value: if the battery power is less than or equal to the third power threshold, determine whether the average speed of the vehicle within the first preset time is greater than or equal to the preset speed threshold, and if so, determine that the vehicle has a fifth situation where the power is rapidly decreasing; if the battery power is less than or equal to the fourth power threshold, determine whether the average speed of the vehicle within the third preset time is greater than or equal to the preset speed threshold, and if so, determine that the vehicle has a sixth situation where the power is rapidly decreasing; if the battery power is less than or equal to the fifth power threshold, determine whether the average speed of the vehicle within the fourth preset time is greater than or equal to the preset speed threshold, and if so, determine that the vehicle has a seventh situation where the power is rapidly decreasing;

[0146] The control device for rapid reduction of power of the above-mentioned extended-range electric vehicle also includes:

[0147] The second reminder module 405 is configured to, when it is determined that the vehicle is experiencing a fifth situation in which the battery power is rapidly decreasing, display a fifth user reminder corresponding to the fifth situation on the vehicle's instrument or screen; when it is determined that the vehicle is experiencing a sixth situation in which the battery power is rapidly decreasing, display a sixth user reminder corresponding to the sixth situation on the vehicle's instrument or screen, and limit the maximum operating power of some or all of the vehicle's electrical equipment; when it is determined that the vehicle is experiencing a seventh situation in which the battery power is rapidly decreasing, display a seventh user reminder corresponding to the seventh situation on the vehicle's instrument or screen, and disable some or all of the vehicle's electrical equipment.

[0148] In some optional embodiments, the control device for rapid power reduction of the above-mentioned extended-range electric vehicle further includes:

[0149] The charging response module 406 is configured to detect whether the vehicle is in a charging state; if it is detected that the vehicle is not in a charging state, it jumps to the step of determining the current battery power value; if it is detected that the vehicle is in a charging state, it jumps to the step of determining the current battery power value, and no longer displays the pop-up prompt, and releases the disabling and maximum operating power limit of some or all of the on-board electrical equipment, or releases the disabling of some or all of the on-board electrical equipment.

[0150] In some optional embodiments, the above-mentioned strategy matching module 402 is configured to respectively calculate a first speed difference between the calibrated maximum power-maintaining vehicle speed and the minimum vehicle speed, and a second speed difference between the actual driving vehicle speed and the minimum vehicle speed; based on the ratio of the first speed difference to the second speed difference, calculate a first product of the ratio and the SOC drop percentage compensation value coefficient, and use the first product as the vehicle speed compensation power generation demand, wherein the SOC drop percentage compensation value coefficient is linearly proportional to the SOC drop value of the vehicle power battery; calculate a second product of the first product multiplied by the drive request power, and add the second product to the accessory request power to obtain the requested power generation power of the generator.

[0151] In some optional embodiments, the control device for rapid power reduction of the above-mentioned extended-range electric vehicle further includes:

[0152] The voice reminder module 407 is configured to, after controlling the generator to start generating electricity and adjusting the generator's generating power based on the requested generating power, use the vehicle's voice system to issue a voice confirmation prompt on whether to switch the driving mode to the fuel priority mode; when a no voice reply is received, the current driving mode remains unchanged; when a yes voice reply is received, or no voice reply is received, the driving mode is switched to the fuel priority mode.

[0153] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0154] See Figure 5 In a fourth embodiment of the present application, a range-extended electric vehicle 5 is provided, which includes a vehicle controller 51 and a battery management system 52 , and the vehicle controller 51 is connected to the battery management system 52 .

[0155] An extended-range electric vehicle is a vehicle that combines pure electric power with traditional fuel power. It is mainly driven by an electric motor, but when the battery power is low, the range extender (usually an internal combustion engine) will be started to charge the battery to extend the driving range. Its main structure includes but is not limited to: power battery, electric motor, range extender (internal combustion engine), vehicle controller (VCU, abbreviation of Vehicle Control Unit) and battery management system (BMS).

[0156] The battery management system 52 is specifically used to monitor and manage the power battery to ensure its safe, reliable and efficient operation. The main functions of the battery management system include but are not limited to battery monitoring, power management, thermal management and safety protection.

[0157] Specifically, the battery management system and the vehicle controller can exchange information. For example, the battery management system monitors the battery status and transmits data such as voltage, current, temperature, SOC, SOH, etc. to the vehicle controller. The vehicle controller determines the target battery power range corresponding to the current battery power of the vehicle based on these data. In addition, the vehicle controller can also send instructions to the battery management system to adjust the battery charge / discharge rate, enable or disable the battery cooling system, etc.

[0158] In some alternative embodiments, see Figure 6 The vehicle controller 51 includes: a processor 511, a memory 512, and a computer program 513 stored in the memory 512 and executable on the processor 511. When the processor 511 executes the computer program 513, the steps in the above-mentioned method embodiments are implemented. Alternatively, when the processor 511 executes the computer program 513, the functions of the modules in the above-mentioned device embodiments are implemented.

[0159] The vehicle controller may include but is not limited to a processor 511 and a memory 512. Those skilled in the art will appreciate that Figure 6 This is only an example of a vehicle controller and does not constitute a limitation on the vehicle controller. Figure 6 More or fewer components, or different components may be shown.

[0160] The processor 511 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0161] The memory 512 may be an internal storage unit of the vehicle controller, for example, a hard disk or memory of the vehicle controller. The memory 512 may also be an external storage device of the vehicle controller, for example, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (FlashCard), etc. equipped on the vehicle controller. The memory 512 may also include both an internal storage unit of the vehicle controller and an external storage device. The memory 512 is used to store computer programs and other programs and data required by electronic devices.

[0162] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional modules in the embodiment can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units.

[0163] If the integrated module is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium (e.g., a computer-readable storage medium). Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. The computer program may include computer program code, which may be in source code form, object code form, executable file or some intermediate form. Computer-readable storage media may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0164] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for controlling rapid power reduction of an extended-range electric vehicle, characterized in that: include: Monitoring whether the vehicle is in a situation where the battery power of the vehicle drops rapidly due to high-speed driving in a preset battery power interval, wherein the preset battery power interval is at least one battery power interval divided in advance by the battery power range of the vehicle power battery; If the vehicle is running at high speed in the preset power range, resulting in a rapid decrease in power, the speed compensation power generation demand is determined based on the vehicle speed parameter, and the requested power generation power of the generator is determined according to the speed compensation power generation demand and the energy consumption demand of the whole vehicle; The generator is controlled to start power generation, and the power generation power of the generator is adjusted based on the requested power generation power.

2. The method according to claim 1, characterized in that The preset power interval includes a first battery power interval; The monitoring of whether the vehicle is running at high speed in a preset power range, resulting in a rapid decrease in power, includes: Detecting whether the vehicle meets a first rapid power reduction determination condition, wherein the first rapid power reduction determination condition includes: whether the average vehicle speed within a first preset time period is greater than or equal to a preset speed threshold, the power consumption exceeds the first power threshold, and the range extender is not started; If the vehicle meets the first battery rapid decline determination condition, it is determined that the vehicle has a first situation of rapid battery decline, and whether the vehicle meets the second battery rapid decline determination condition, the second battery rapid decline determination condition including: whether the average vehicle speed within a second preset time period is greater than or equal to a preset speed threshold, and the range extender is started, wherein the second preset time period is a continuous time period including the first preset time period, and the second preset time period is greater than the first preset time period; If the vehicle satisfies the second rapid battery reduction determination condition, determining that the vehicle has a second rapid battery reduction condition; In a first situation where the battery power of the vehicle drops rapidly, a user reminder corresponding to the first situation is displayed on a meter or screen of the vehicle; In the second case where the battery power of the vehicle drops rapidly, the following steps are performed: based on the vehicle speed parameters, the speed compensation power generation demand is determined, and according to the speed compensation power generation demand and the energy consumption demand of the whole vehicle, the requested power generation power of the generator is determined.

3. The method according to claim 2, characterized in that The preset power interval includes a second battery power interval, and the first battery power interval and the second battery power interval are two different power intervals; The monitoring of whether the vehicle is running at high speed in a preset power range, resulting in a rapid decrease in power, includes: Detecting whether the vehicle meets a third rapid battery drop determination condition, wherein the third rapid battery drop determination condition includes: whether the average vehicle speed within a first preset time period is greater than or equal to a preset speed threshold, and the range extender is not started; If the vehicle meets the third rapid power reduction determination condition, it is determined that the vehicle has a third situation of rapid power reduction, and whether the vehicle meets the fourth rapid power reduction determination condition, the fourth rapid power reduction determination condition including: whether the average vehicle speed within the first preset time period is greater than or equal to a preset speed threshold, the power consumption exceeds the second power threshold, and the range extender is not started; If the vehicle satisfies the fourth rapid battery reduction determination condition, it is determined that the vehicle is experiencing a fourth rapid battery reduction situation.

4. The method according to claim 3, characterized in that After monitoring whether the vehicle is running at high speed in the preset power range, causing the power to drop rapidly, it also includes: When it is determined that the vehicle has a third situation in which the battery power is rapidly decreasing, a third user reminder corresponding to the third situation is displayed on the instrument or screen of the vehicle; When it is determined that the fourth situation of the vehicle's battery power rapidly decreases, a fourth user reminder corresponding to the fourth situation is displayed on the instrument or screen of the vehicle.

5. The method according to claim 3, characterized in that: The preset power interval includes a third battery power interval, and the first battery power interval, the second battery power interval and the third battery power interval are mutually exclusive intervals; The monitoring of whether the vehicle is running at high speed in a preset power range, resulting in a rapid decrease in power, includes: Determine the current battery charge value: If the battery power is less than or equal to the third power threshold, determining whether the average speed of the vehicle within the first preset time period is greater than or equal to the preset speed threshold, and if so, determining that the vehicle has a fifth situation of rapid power reduction; If the battery power is less than or equal to the fourth power threshold, determining whether the average speed of the vehicle within the third preset time period is greater than or equal to the preset speed threshold, and if so, determining that the vehicle has a sixth situation of rapid power reduction; If the battery power is less than or equal to the fifth power threshold, determining whether the average speed of the vehicle within the fourth preset time period is greater than or equal to the preset speed threshold, and if so, determining that the vehicle has a seventh situation of rapid power reduction; After monitoring whether the vehicle is running at high speed in the preset power range, causing the power to drop rapidly, it also includes: When it is determined that the vehicle has a fifth situation in which the battery power is rapidly decreasing, a fifth user reminder corresponding to the fifth situation is displayed on the instrument or screen of the vehicle; When it is determined that the sixth situation of the vehicle power rapidly decreases, a sixth user reminder corresponding to the sixth situation is displayed on the vehicle instrument or screen, and the maximum operating power of some or all of the vehicle-mounted electrical equipment is limited; When it is determined that the vehicle is experiencing the seventh situation of rapid battery decline, a seventh user reminder corresponding to the seventh situation is displayed on the vehicle's instrument or screen, and some or all of the vehicle's electrical equipment is disabled.

6. The method according to claim 5, characterized in that Also includes: Detect whether the vehicle is in charging state; If it is detected that the vehicle is not in a charging state, jump to the step of determining the current battery power value; If it is detected that the vehicle is in a charging state, jump to the step of determining the current battery power value, and no longer display the pop-up prompt, and lift the disabling and maximum operating power limit of some or all of the vehicle's electrical equipment, or lift the disabling of some or all of the vehicle's electrical equipment.

7. The method according to any one of claims 1 to 6, characterized in that The method of determining the vehicle speed compensation power generation demand based on the vehicle speed parameter, and determining the requested power generation power of the generator according to the vehicle speed compensation power generation demand and the vehicle energy consumption demand, includes: Calculate the first speed difference between the calibrated maximum power-maintaining vehicle speed and the minimum vehicle speed, and the second speed difference between the actual driving vehicle speed and the minimum vehicle speed respectively; Based on the ratio of the first speed difference to the second speed difference, a first product of the ratio and the SOC decrease percentage compensation value coefficient is calculated, and the first product is used as the vehicle speed compensation power generation demand, wherein the SOC decrease percentage compensation value coefficient is linearly proportional to the SOC decrease value of the vehicle power battery; A second product of the first product and the driving request power is calculated, and the second product is added to the accessory request power to obtain the requested power generation power of the generator.

8. The method according to any one of claims 2 to 7, characterized in that: In the first case of a rapid drop in vehicle power, it also includes: Using the vehicle voice system, a voice confirmation prompt is issued to ask whether to switch the driving mode to the fuel priority mode; When the voice response received is no, the current driving mode is kept unchanged; When a voice response of yes is received, or when no voice response is received, the driving mode is switched to the fuel priority mode.

9. A control device for rapid power reduction of an extended-range electric vehicle, characterized in that: include: A power monitoring module is configured to monitor whether the vehicle has a situation in which the power drops rapidly due to high-speed driving in a preset power interval, wherein the preset power interval is at least one battery power interval divided by the battery power range of the vehicle power battery in advance; The strategy matching module is configured to determine the speed compensation power generation demand based on the vehicle speed parameter if the vehicle is traveling at a high speed in a preset power range, resulting in a rapid decrease in power, and determine the requested power generation power of the generator according to the speed compensation power generation demand and the energy consumption demand of the whole vehicle; The strategy response module is configured to control the generator to start power generation and adjust the power generation of the generator based on the requested power generation.

10. An extended-range electric vehicle, comprising a vehicle controller and a battery management system, wherein the vehicle controller is connected to the battery management system and comprises at least a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 8 are implemented.

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