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

Abstract

The application relates to the technical field of range-extended electric vehicles, and provides a control method and device for rapid power drop of a range-extended electric vehicle and the range-extended electric vehicle. The method comprises the following steps: monitoring whether a high-speed driving condition leading to rapid power drop exists in a preset power interval of the vehicle, if yes, determining a speed compensation power generation demand based on a vehicle speed parameter, and determining a requested power generation power of a generator according to the speed compensation power generation demand and a whole vehicle energy consumption demand; controlling the generator to start power generation, and adjusting the power generation power of the generator based on the requested power generation power. The application controls the power generation power of the motor according to the high-speed driving condition leading to rapid power drop in the preset power interval of the vehicle, so that the power drop speed of the power battery is delayed and maintained, and the driving experience and satisfaction of the user are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of extended-range electric vehicles, and particularly relates to a control method and device for rapid decrease of electric quantity of an extended-range electric vehicle and the extended-range electric vehicle. BACKGROUND

[0002] In a new energy vehicle equipped with a power battery, the vehicle monitors the SOC (State of Charge) of the power battery, which is used to display the remaining electric quantity of the battery in an electric vehicle, and prompts the user when the SOC of the power battery is low, so that the user can charge in time after receiving the low electric quantity prompt. However, the speed limit in different countries and regions around the world is different, and there is no specific prompting and control strategy for the use scenario of the power battery in which the electric quantity decreases rapidly under superhigh-speed driving and the electric quantity cannot be maintained.

[0003] Taking an extended-range electric vehicle as an example, the balance between the generator power and the driving consumption power (highest speed interval) has been considered in the initial design of the extended-range electric vehicle. However, due to the different speed limits of highways in different countries and regions, there is always a case where the vehicle speed is greater than the highest speed value of the labeled power preservation, and the driving consumption power is greater than the generator power, so that the power battery electric quantity cannot be maintained, resulting in continuous decrease of the power battery electric quantity.

[0004] Therefore, for the case that the driving power is greater than the generator power, resulting in rapid decrease of the power battery electric quantity under superhigh-speed driving of the extended-range electric vehicle, how to prompt the user and control the power generation is a technical problem encountered in the use of the current extended-range electric vehicle and needs to be solved urgently. SUMMARY

[0005] Therefore, the embodiments of the present application provide a control method and device for rapid decrease of electric quantity of an extended-range electric vehicle and the extended-range electric vehicle, to solve the technical problem that the vehicle does not prompt the user and control the generator power in the case that the driving power is greater than the generator power, resulting in rapid decrease of the power battery electric quantity under superhigh-speed driving of the extended-range electric vehicle.

[0006] In a first aspect, the embodiments of the present application provide a control method for rapid decrease of electric quantity of an extended-range electric vehicle, comprising: monitoring whether there is a case of rapid decrease of electric quantity caused by high-speed driving in a preset electric quantity interval, the preset electric quantity interval being at least one battery electric quantity interval divided in advance by the vehicle power battery; if there is a case of rapid decrease of electric quantity caused by high-speed driving in the preset electric quantity interval, determining a speed compensation power generation demand based on a vehicle speed parameter, and determining a requested generator power according to the speed compensation power generation demand and a whole vehicle energy consumption demand; controlling the generator to start power generation, and adjusting the generator power based on the requested generator power.

[0007] In a second aspect, the application provides a control device for rapid decrease of electric quantity of a range-extended electric vehicle, comprising: an electric quantity monitoring module configured to monitor whether there is a case of rapid decrease of electric quantity caused by high-speed driving of the vehicle in a preset electric quantity interval, the preset electric quantity interval being at least one battery electric quantity interval divided in advance from a battery electric quantity range of a vehicle power battery; a strategy matching module configured to, if there is the case of rapid decrease of electric quantity caused by high-speed driving of the vehicle in the preset electric quantity interval, determine a vehicle speed compensation power generation demand based on a vehicle driving speed parameter, and determine a requested power generation power of a generator according to the vehicle speed compensation power generation demand and a whole vehicle energy consumption demand; and a strategy response module configured to control the generator to start power generation, and adjust the power generation power of the generator based on the requested power generation power.

[0008] In a third aspect, the application provides a range-extended electric vehicle, comprising a whole vehicle controller and a battery management system, the whole vehicle controller being connected with the battery management system, and at least comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the above method when executing the computer program.

[0009] Compared with the prior art, the application has the beneficial effects that: the control method for rapid decrease of electric quantity of the range-extended electric vehicle monitors whether there is a case of rapid decrease of electric quantity caused by high-speed driving of the vehicle in a preset electric quantity interval, the preset electric quantity interval being at least one battery electric quantity interval divided in advance from a battery electric quantity range of a vehicle power battery; if there is the case of rapid decrease of electric quantity caused by high-speed driving of the vehicle in the preset electric quantity interval, a vehicle speed compensation power generation demand is determined based on a vehicle driving speed parameter, and a requested power generation power of a generator is determined according to the vehicle speed compensation power generation demand and a whole vehicle energy consumption demand; 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 specifically control the power generation power of the generator, thereby delaying and maintaining the decrease speed of the power battery electric quantity, and improving the driving experience and satisfaction of the user. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0011] Figure 1 is a flowchart of a control method for rapid decrease of electric quantity of a range-extended electric vehicle provided by the application;

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

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

[0014] Figure 4 is a structural schematic diagram of a control device for rapid drop of electric quantity of a range-extended electric vehicle provided by an embodiment of the present application;

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

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

[0017] In the following description, for the purpose of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0018] Referring to Figure 1 In the first embodiment of the present application, a control method for rapid drop of electric quantity of a range-extended electric vehicle is provided, comprising the following steps:

[0019] S101, monitoring whether there is a case of rapid drop of electric quantity caused by high-speed driving in a preset electric quantity interval, the preset electric quantity interval being at least one battery electric quantity interval divided in advance in a battery electric quantity range of a vehicle power battery;

[0020] S102, if there is a case of rapid drop of electric quantity caused by high-speed driving in the preset electric quantity interval, determining a vehicle speed compensation power generation demand based on a vehicle driving speed parameter, and determining a requested power generation power of a generator according to the vehicle speed compensation power generation demand and a 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] The embodiment monitors the battery power of the vehicle, determines the speed compensation power generation demand based on the vehicle speed parameter when the vehicle has high-speed driving in the preset power interval resulting in rapid power decline, and determines the requested power generation power of the generator according to the speed compensation power generation demand and the vehicle energy consumption demand, so as to control the motor power generation power, delay and maintain the power battery power decline speed, and improve the user driving experience and satisfaction.

[0023] The vehicle has high-speed driving in the preset power interval resulting in rapid power decline is not unique, that is, when the preset power interval includes one battery power interval, the vehicle may have one case of high-speed driving in the one battery power interval resulting in rapid power decline, or multiple cases of high-speed driving in the one battery power interval resulting in rapid power decline. If there are multiple cases, the above step S102 only responds to one of the cases, and other measures can be taken for other cases, including but not limited to issuing a user reminder.

[0024] In an optional embodiment, the preset power interval includes a first battery power interval, and the step S101 of monitoring whether the vehicle has high-speed driving in the preset power interval resulting in rapid power decline includes:

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

[0026] If the vehicle meets the first rapid power decline determination condition, it is determined that the vehicle has a first case of rapid power decline, and whether the vehicle meets a second rapid power decline determination condition is detected, the second rapid power decline determination condition including whether the average speed in 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 containing 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 power decline determination condition, it is determined that the vehicle has a second case of rapid power decline;

[0028] In the first case of rapid power decline, a user reminder corresponding to the first case is displayed on the instrument or screen of the vehicle;

[0029] In the second case of rapid power decline of the vehicle, the step S102 is performed.

[0030] Specifically, the second preset time length is a continuous time length containing the first preset time length, and the second preset time length is greater than the first preset time length, which means that the second preset time period not only covers the first time period, but also must exceed the first time period in the total length. This can be illustrated with specific time intervals, such as 8:00 to 8:05 in the morning and 8:00 to 8:10 in the morning. The former represents the first preset time length, i.e. 5 minutes, and the latter represents the second preset time length, i.e. 10 minutes. It can be seen that the latter not only contains the former, but also is longer.

[0031] In the embodiment, there are two cases of rapid power drop caused by high-speed driving of the vehicle in the first battery power interval, i.e. the first case of rapid power drop and the second case of rapid power drop, wherein only the second case of rapid power drop is executed step S102.

[0032] The embodiment delays and maintains the power battery power drop speed by reminding the user and controlling the power generation power of the generator respectively according to the two cases of rapid power drop caused by high-speed driving of the vehicle in the first battery power interval.

[0033] According to the above embodiment, in the second case of rapid power drop, the vehicle will regulate the requested power generation of the generator, and the specific implementation mode of the regulation is not unique.

[0034] In some optional embodiments, based on the vehicle speed parameter, the vehicle speed compensation power generation demand is determined, and based on the vehicle speed compensation power generation demand and the whole vehicle energy consumption demand, the requested power generation of the generator is determined, including: calculating a first speed difference value of the highest power protection vehicle speed and the minimum vehicle speed, and a second speed difference value of the actual driving vehicle speed and the minimum vehicle speed; based on the ratio of the first speed difference value and the second speed difference value, calculating a first product of the ratio and a SOC drop percentage compensation value coefficient, and taking the first product as the vehicle speed compensation power generation demand, wherein the SOC drop percentage compensation value coefficient is in a linear positive proportional relationship with the SOC drop value of the vehicle power battery; calculating a second product of the first product and the driving request power, and adding the second product and the accessory request power to obtain the requested power generation of the generator.

[0035] Specifically, referring to Figure 2The SOC percentage drop 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 percentage drop 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 in a preset power interval and high-speed driving causes the power to drop rapidly, the requested power generation of the generator can be calculated according to the formula Pr=Pc*K*(Vmax2-Vmin) / (Vmax1-Vmin)+Pa, wherein Pr represents the requested power generation, Vmax2 represents the actual driving speed, Vmax1 represents the calibrated maximum power protection speed, Vmin represents the minimum speed, K represents the SOC percentage drop 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, and the step S101 of monitoring whether the vehicle is in a case of high-speed driving causing the power to drop rapidly in the preset power interval includes:

[0037] detecting whether the vehicle satisfies a third power rapid drop determination condition, the third power rapid drop determination condition including whether the average speed in the first preset time length is greater than or equal to a preset speed threshold, and the range extender is not started;

[0038] If the vehicle satisfies the third power rapid drop determination condition, it is determined that the vehicle is in a third case of power rapid drop, and whether the vehicle satisfies a fourth power rapid drop determination condition is detected, the fourth power rapid drop determination condition including whether the average speed in the first preset time length is greater than or equal to a preset speed threshold, the power consumption exceeds a second power threshold, and the range extender is not started;

[0039] If the vehicle satisfies the fourth power rapid drop determination condition, it is determined that the vehicle is in a fourth case of power rapid drop.

[0040] The second power threshold is less than the first power threshold. This embodiment increases the case of power rapid drop caused by high-speed driving of the vehicle in the second battery power interval, and respectively prompts the user to use the vehicle to know the current power change.

[0041] On the basis of the first battery power interval, the second battery power interval is added in this embodiment, and if the vehicle is in a case of power rapid drop caused by high-speed driving in the second battery power interval, appropriate measures will also be taken.

[0042] Following the above optional embodiments, in one optional embodiment, after monitoring whether the vehicle is driving at high speed within a preset battery range, causing the battery to drop rapidly, the method further includes: when it is determined that the vehicle is experiencing a third situation of rapid battery drop, displaying a third user alert corresponding to the third situation on the vehicle's instrument panel or screen; when it is determined that the vehicle is experiencing a fourth situation of rapid battery drop, displaying a fourth user alert corresponding to the fourth situation on the vehicle's instrument panel or screen.

[0043] For example, in another optional embodiment, the preset battery power range includes a third battery power range, wherein the first battery power range, the second battery power range, and the third battery power range are three consecutive mutually exclusive ranges; in step S101 above, monitoring whether the vehicle is traveling at high speed within the preset battery power range, causing a rapid decrease in battery power, includes:

[0044] Determine the current battery level:

[0045] If the battery charge is less than or equal to the third charge threshold, determine whether the vehicle's average speed within the first preset time period is greater than or equal to the preset speed threshold. If so, determine that the vehicle has experienced a fifth situation where the battery charge drops rapidly.

[0046] If the battery charge is less than or equal to the fourth charge threshold, determine whether the vehicle's average speed within the third preset time period is greater than or equal to the preset speed threshold. If so, determine that the vehicle has experienced the sixth situation of rapid battery depletion.

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

[0048] Specifically, the first, second, and third battery capacity ranges can cover the entire battery capacity range or only a portion of it. For example, when three consecutive mutually exclusive ranges cover the entire battery capacity range, the first, second, and third battery capacity ranges can be three ranges divided according to the battery capacity from 0% to 100%; when three consecutive mutually exclusive ranges cover only a portion of the battery capacity range, the first, second, and third battery capacity ranges are three ranges divided according to the battery capacity from 0% to 80%. For example, as... Figure 3 As shown, the first battery capacity range is 30%-80%, the second battery capacity range is 10%-30%, and the third battery capacity range is 0-10%. The specific range of each battery capacity range can be set according to the application scenario, and this application does not impose any restrictions on this.

[0049] The embodiment of the present application monitors whether the vehicle has the condition of rapid battery power decline caused by overspeed driving in the third battery power interval, so as to take corresponding measures according to the condition to delay and maintain the power battery power decline speed.

[0050] In the above optional embodiment, after monitoring whether the vehicle has the condition of rapid battery power decline caused by overspeed driving in the preset power interval, the method further comprises:

[0051] When the fifth condition of rapid battery power decline of the vehicle is determined, a fifth user prompt corresponding to the fifth condition is displayed on the instrument or screen of the vehicle;

[0052] When the sixth condition of rapid battery power decline of the vehicle is determined, a sixth user prompt corresponding to the sixth condition is displayed on the instrument or screen of the vehicle, and the maximum working power of part or all of the vehicle-mounted electrical equipment is limited;

[0053] When the seventh condition of rapid battery power decline of the vehicle is determined, a seventh user prompt corresponding to the seventh condition is displayed on the instrument or screen of the vehicle, and part or all of the vehicle-mounted electrical equipment is disabled.

[0054] In the actual application scenario, the way of user prompt is not unique, including but not limited to displaying a pop-up prompt on the display screen or instrument of the vehicle.

[0055] In an optional embodiment, immediately after the above optional embodiment, when the battery power of the vehicle is in the third battery power range, if the vehicle has the condition of rapid battery power decline caused by overspeed driving, the method further comprises:

[0056] Detecting whether the vehicle is in a charging state;

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

[0058] If it is detected that the vehicle is in a charging state, jumping to the step of determining the current battery power value, and no longer displaying the pop-up prompt, and canceling the disabling and maximum working power limitation of part or all of the vehicle-mounted electrical equipment, or canceling the disabling of part or all of the vehicle-mounted 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 charging, if the vehicle is charging, the corresponding measures taken for the vehicle in the third battery power interval due to the rapid battery power decline can be canceled to restore the normal use of the vehicle.

[0060] Further, in an optional embodiment, in the first case where the vehicle has a rapid battery power drop, the method further comprises:

[0061] Using the vehicle-mounted voice system, a voice confirmation prompt is given as to whether to switch the driving mode to the fuel priority mode;

[0062] When a voice reply of no is received, the current driving mode is maintained;

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

[0064] The embodiment interacts with the user through the vehicle-mounted voice system, gives the user a corresponding voice confirmation prompt, and requests the user to determine whether to switch the current driving mode of the vehicle to cope with the auxiliary measures of the vehicle in the case of rapid battery power drop, so as to delay and maintain the power battery power drop speed.

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

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

[0067] S202, determining the target battery power interval corresponding to the current battery power of the vehicle based on a plurality of battery power intervals divided in advance 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, determining whether the battery power of the vehicle in the target battery power interval has a rapid battery power drop based on a pre-set rapid battery power drop determination condition for each battery power interval, the rapid battery power drop determination condition including at least one data based on the average vehicle speed, the range extender working state and the battery power change of the vehicle within at least one pre-set time period, and a threshold value set for each data, and at least one pre-set condition;

[0069] S204, when the vehicle has a rapid battery power drop, controlling the vehicle to execute a user reminder and a target power generation control strategy corresponding to the target battery power interval.

[0070] In actual application, the above-mentioned control method for rapid battery power drop of a range-extended electric vehicle can be applied to a range-extended electric vehicle, and the method is executed by the vehicle controller of the range-extended electric vehicle.

[0071] The working principle of the control method for the rapid decrease of the electric quantity of the extended-range electric vehicle is that, during the use of the vehicle, there is always a case of vehicle speed > the highest vehicle speed value for maintaining the electric quantity, so that the driving travel consumption electric quantity > the generator power generation electric quantity, thereby the power battery electric quantity cannot be maintained, leading to the continuous decrease of the power battery electric quantity until the balance point of the vehicle speed and the power output of the power battery is reached. Therefore, the control method provided in the embodiment can delay and maintain the decrease speed of the power battery electric quantity by reminding the user and adjusting the generator power generation electric quantity when the average battery electric quantity decrease percentage exceeds a certain value within a certain time range and in different power battery electric quantity interval value ranges, so as to improve the driving experience and satisfaction of the user.

[0072] It can be seen that, according to the control method for the rapid decrease of the electric quantity of the extended-range electric vehicle provided in the embodiment, the battery electric quantity of the power battery is obtained; the target battery electric quantity interval corresponding to the current battery electric quantity of the vehicle is determined based on the plurality of battery electric quantity intervals divided in advance for the whole range of the battery electric quantity, the plurality of battery electric quantity intervals are in a mutually exclusive and exhaustive relationship, and the target battery electric quantity interval is one of the plurality of battery electric quantity intervals; whether the battery electric quantity of the vehicle in the target battery electric quantity interval has a rapid decrease of the electric quantity is judged based on the rapid decrease of the electric quantity judgment condition preset for each battery electric quantity interval, the rapid decrease of the electric quantity judgment condition includes at least one of the average vehicle speed of the vehicle within at least one preset time length, the working state of the range extender, and the change of the battery electric quantity, and the threshold value set for each data, and at least one preset condition is determined; when the vehicle has a rapid decrease of the electric quantity, the vehicle is controlled to execute the user reminder and the target power generation control strategy corresponding to the target battery electric quantity interval, so as to respectively perform the targeted user reminder and the generator power generation power control of the vehicle within a certain time range according to different battery electric quantity intervals within the whole electric quantity range of the power battery, thereby delaying and maintaining the decrease speed of the power battery electric quantity, and improving the driving experience and satisfaction of the user.

[0073] Specifically, after the step S203, if the vehicle does not have a rapid decrease of the electric quantity, the step S201 is returned to, and the above method steps are cyclically executed.

[0074] In step S201, the battery power refers to the SOC of the power battery. In the extended-range electric vehicle, a BMS (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 power (SOC). For example, in an optional embodiment, the vehicle controller of the extended-range electric vehicle is connected to the battery management system through a CAN bus, the battery management system is used to collect and calculate the battery power of the power battery, and then the battery management system sends the SOC data to the vehicle controller through the CAN bus.

[0075] In step S202, the full range of the battery power refers to the battery power from 0% to 100%, and the battery power from 0% to 100% is divided into a plurality of battery power intervals. The plurality of battery power intervals are mutually exclusive, which means that there is no overlap between each battery power interval, i.e. any power value at the same time can only belong to one interval; and the plurality of battery power intervals are exhaustive, which means that all battery power intervals cover the entire power range from 0% to 100%, i.e. there is no power value outside the interval. Specifically, the number of battery power intervals can be two, three, four or more. It should be noted that each battery power interval can be an equal interval, i.e. each interval has the same range. For example, the battery power from 0% to 100% is divided into 10 battery power intervals, and each battery power interval has a range of 10%. Alternatively, each battery power interval can be an unequal interval, i.e. each interval has a different range. For example, 0% to 100% is divided into three battery power intervals, which can be 0% to 20%, 20% to 50%, and 50% to 100%. Of course, among the plurality of battery power intervals, some battery power intervals can be equal intervals, and some battery power intervals can be unequal intervals. For example, 0% to 100% is divided into four battery power intervals, which are 100%≥SOC≥80%, 80%≥SOC>30%, 30%≥SOC>10%, and 10%≥SOC≥0%. In practice, the range of each battery power interval can be set according to 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 in sequence. The ranges of the first battery power interval, the second battery power interval, the third battery power interval and the fourth battery power interval are in sequence increasing. 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 is, the less obvious the impact on the driving experience of the user is even in the case of rapid battery power decline. On the contrary, the lower the battery power of the power battery is, the more obvious the impact on the driving experience of the user is if the driving consumption power is large, resulting in rapid battery power decline. Therefore, the power rapid decline determination conditions for the battery power in each divided battery power interval are different in the embodiments of the present application, and the power rapid decline determination conditions for each divided battery power interval are described in detail below.

[0078] The power rapid decline determination condition is not unique, but in the embodiments, it is for the scenario that the driving power > the power generation power of the range-extending electric vehicle, resulting in rapid battery power decline of the power battery. Therefore, at least one preset condition is determined based on at least one of the average speed of the vehicle in at least one preset time period, the working state of the range extender and the battery power change, and the threshold value set for various data, and the power rapid decline determination condition for each divided battery power interval includes at least one preset condition. If the power rapid decline determination condition for one divided battery power interval includes two or more preset conditions, each preset condition corresponds to a different degree of battery power decline in sequence.

[0079] In an optional embodiment, in step S203, it is determined whether the battery power of the vehicle in the target battery power interval exists the power rapid decline condition based on the power rapid decline determination condition preset for each battery power interval, including:

[0080] When the target battery power interval corresponding to the battery power is the first battery power interval, it is determined that the vehicle does not appear the power rapid decline condition, and the step of acquiring the battery power of the power battery is returned to.

[0081] When the target battery power interval corresponding to the battery power is the second battery power interval, it is detected whether the vehicle satisfies a first power rapid drop determination condition, the first power rapid drop determination condition including: whether the average vehicle speed in a first preset time period is greater than or equal to a preset speed threshold and the power consumption exceeds a first power threshold; the range extender is not started; if the vehicle satisfies the first power rapid drop determination condition, it is determined that the vehicle appears in a first case of power rapid drop, and it is detected whether the vehicle satisfies a second power rapid drop determination condition, the second power rapid drop determination condition including: whether the average vehicle speed in a second preset time period is greater than or equal to a preset speed threshold, the second preset time period and the first preset time period are continuous time periods, and the second preset time period is longer than the first preset time period; the range extender is started; if the vehicle satisfies the second power rapid drop determination condition, it is determined that the vehicle appears in a second case of power rapid drop.

[0082] When the target battery power interval corresponding to the battery power is the third battery power interval, it is detected whether the vehicle satisfies a third power rapid drop determination condition, the third power rapid drop determination condition including: whether the average vehicle speed in a third preset time period is greater than or equal to a preset speed threshold and the range extender is not started; if the vehicle satisfies the third power rapid drop determination condition, it is determined that the vehicle appears in a third case of power rapid drop, and it is detected whether the vehicle satisfies a fourth power rapid drop determination condition, the fourth power rapid drop determination condition including: whether the average vehicle speed in a fourth preset time period is greater than or equal to a preset speed threshold and the power consumption exceeds a second power threshold; the range extender is not started; if the vehicle satisfies the fourth power rapid drop determination condition, it is determined that the vehicle appears in a fourth case of power rapid drop.

[0083] When the target battery power interval corresponding to the battery power is the fourth battery power interval, it is determined that the current battery power value: if the battery power is less than or equal to a third power threshold, it is judged whether the average vehicle speed of the vehicle in a fifth preset time period is greater than or equal to a preset speed threshold, if yes, it is determined that the vehicle appears in a fifth case of power rapid drop; if the battery power is less than or equal to a fourth power threshold, it is judged whether the average vehicle speed of the vehicle in a sixth preset time period is greater than or equal to a preset speed threshold, if yes, it is determined that the vehicle appears in a sixth case of power rapid drop; if the battery power is less than or equal to a fifth power threshold, it is judged whether the average vehicle speed of the vehicle in a seventh preset time period is greater than or equal to a preset speed threshold, if yes, it is determined that the vehicle appears in a seventh case of power rapid drop.

[0084] Specifically, in the first battery power interval scenario, the battery power is relatively high because the power range of the first battery power interval is the highest. Even if the battery power drops rapidly in a short time, the battery still has enough power to meet the driving needs of the vehicle. Therefore, regardless of the current power mode of the vehicle, no prompt or generator power adjustment is needed. As can be seen, the power battery can withstand rapid power drops in a short time without emergency prompts or generator power control in the case of high power. This control strategy optimizes energy management, improves driving experience, and ensures efficient operation of the vehicle 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 time length and the second preset time length are two specific time lengths within a period of time, and the second preset time length is longer than the first preset time length. For example, the first power rapid drop determination condition is that the average vehicle speed is > 150 kph (kilometers per hour) within 5 minutes, and the SOC drops by ≥ 10%, and the range extender is not started. In addition, the second power rapid drop determination condition is that the average vehicle speed is > 150 kph within 10 minutes, and the range extender is started. In this example, the first preset time length is 5 minutes, the second preset time length is 10 minutes, the first power threshold is 10%, and the speed threshold is 150 kph. Of course, the first preset time length, the second preset time length, 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 not starting can be the current power mode of the vehicle without starting, or it can be unable to start due to the vehicle being out of fuel or the range extender being abnormal, and the embodiments of the present application do not limit this.

[0086] In the third battery power interval scenario, 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 that of the second battery power interval, and the battery power in the third battery power interval is lower. In the case of high-speed driving of the vehicle, the power battery SOC drop is allowed to be lower. For example, the third power rapid drop determination condition is that the average vehicle speed is > 150 kph within 5 minutes, and the power battery SOC drops by ≥ 5%, and the range extender is not started. In addition, the fourth power rapid drop determination condition is that the average vehicle speed is > 150 kph within 5 minutes, and the range extender is started. In this example, the second power threshold is 5%, and the third preset time length and the fourth preset time length are 5 minutes, i.e., the third preset time length and the fourth preset time length are less than or equal to the second preset time length. In practice, the third preset time length and the fourth preset time length can be the same or different. In addition, the speed threshold corresponding to the average speed is the same as the scenario of the above battery power interval, which will not be described here.

[0087] In the fourth battery power interval scenario, the battery power is the lowest, and the power battery cannot support the vehicle to run at high speed for a long time. Therefore, the fifth preset time length, the sixth preset time length, and the seventh preset time length are respectively less than or equal to the fourth preset time length, and the fifth preset time length, the sixth preset time length, and the seventh preset time length decrease in turn. 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, which is not limited here. For example, when the battery power is in the fourth battery power interval, the fifth power rapid decline determination condition is: 5% < SOC≤10%, and the average speed of the vehicle in 5 min > 150 kph; the sixth power rapid decline determination condition is: 3% < SOC≤5%, and the average speed of the vehicle in 3 min > 150 kph; and the seventh power rapid decline determination condition is: SOC≤3%, and the average speed of the vehicle in 1 min > 140 kph. In this example, the third power threshold can be 10%, the fourth power threshold can be 5%, and the fifth power threshold can be 3%. The fifth preset time length, the sixth preset time length, and the seventh preset time length are 5 min, 3 min, and 1 min respectively.

[0088] As can be known from the above optional embodiment, there are many cases of rapid power decline when the vehicle battery power is in different battery power intervals. Correspondingly, the countermeasures for each case of rapid power decline are different. The countermeasures for various cases of rapid power decline will be described in detail below.

[0089] In an optional embodiment, when the vehicle has a rapid power decline, the vehicle is controlled to execute the user reminder and the target power generation control strategy corresponding to the target battery power interval in step S204 described above, including:

[0090] When the first case of rapid power decline of the vehicle is determined, a first pop-up prompt is displayed on the instrument or screen of the vehicle;

[0091] When the second case of rapid power decline of the vehicle is determined, the power generation power of the generator is controlled using the target power control strategy, and the target power 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, wherein Pr represents the requested power generation power, V max2 represents the actual driving speed, and V max1represents the calibrated maximum power vehicle speed, V min represents the minimum vehicle speed, K represents the SOC percentage drop compensation value coefficient, and K is in a linear positive relationship with the SOC drop value, Pc represents the drive request power, and Pa represents the accessory request power;

[0093] Display the second pop-up prompt on the instrument or screen of the vehicle.

[0094] Specifically, the manner of displaying the first pop-up prompt is not unique and includes but is not limited to repeatedly displaying the first pop-up prompt at intervals of a period of time or displaying the first pop-up prompt within a fixed time length. Similarly, the manner of displaying the first pop-up prompt is the same, which will not be described here.

[0095] The specific content of the first pop-up prompt and the second pop-up prompt can be the same or different. In the embodiment, the content of the pop-up prompt displayed on the instrument or display screen under different rapid power drop conditions can be selected to be different.

[0096] For example, in combination with Figure 2 In some extended-range electric vehicles, if the vehicle appears in the first case of rapid power drop, the vehicle controller sends a first signal of rapid power drop of the power battery, and after the instrument controller receives the first signal, the instrument controller displays a pop-up prompt for 5 seconds: pure electric driving, vehicle speed is too high, power battery power drops too fast, and it is recommended that the vehicle speed be controlled within 140 kph (in practice, it can also be other speed values less than 150 kph); if the vehicle continues to meet the first condition, the instrument controller displays a pop-up prompt every 3 minutes: in pure electric driving, the vehicle speed is too high, the power battery power drops too fast, and it is recommended that the vehicle speed be controlled within 140 kph. In addition, if the vehicle appears in the second case of rapid power drop, the vehicle controller sends a target generator control strategy to the generator controller (i.e., Generator Control Unit, abbreviated as GCU), and the target generator control strategy includes a request power calculation formula: Pr=Pc*K*(V max 2-V min ) / (V max1 -V min )+Pa, to increase the GCU power request in advance; at the same time, the vehicle controller sends a second signal of rapid power drop of the power battery, and after the instrument controller receives the second signal, the instrument controller displays a pop-up prompt for 5 seconds: the vehicle speed is too high, and the power generation cannot maintain the power battery, and it is recommended that the vehicle speed be controlled within 140 kph, wherein when the vehicle continues to meet the second case of rapid power drop, the instrument controller displays a pop-up prompt every 10 minutes: the vehicle speed is too high, and the power generation cannot maintain the power battery, and it is recommended that the vehicle speed be controlled within 140 kph.

[0097] In the above request power calculation formula, the coefficient K value is obtained through internal calibration and real vehicle verification, and there may be deviations in practice. See Figure 3A relationship diagram between the SOC drop percentage compensation value coefficient K and the SOC drop value is shown in FIG. 6, where the SOC drop value and the coefficient K are in a linear positive relationship, that is, the lower the SOC, the higher the K value. Figure 3

[0098] Further, when the vehicle does not satisfy the second situation of rapid drop in power, the generator controller requests that the power generation power can return to the original power generation strategy. The original power generation strategy can be any power generation strategy of the generator controller. Since the original power generation strategy is not a contribution of the present application to the prior art, the content of the original power generation strategy is not limited in the embodiments of the present application.

[0099] In some optional embodiments, when it is determined that the vehicle appears in the second situation of rapid drop in power, the vehicle is controlled to perform the user reminder corresponding to the target battery power interval and the target power generation control strategy, and further comprising:

[0100] A voice confirmation prompt for switching the driving mode to the fuel priority mode is issued by using the vehicle-mounted voice system;

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

[0102] When the voice reply is received as yes, or no voice reply is received, the driving mode is switched to the fuel priority mode.

[0103] Specifically, in the extended-range electric vehicle, when the vehicle appears in the second situation of rapid drop in power, the cabin controller receives the second signal of rapid drop in power of the power battery sent by the vehicle controller, and based on the vehicle-mounted voice system, the user is prompted by voice whether to switch the vehicle mode to the fuel priority mode to improve the drivability when the current vehicle speed is high and the power drops rapidly. If the user answers no, the vehicle mode remains unchanged; if the user does not answer or answers yes, the cabin controller sends the fuel priority mode to the vehicle controller, the vehicle controller controls the vehicle driving mode to the fuel priority mode, and the cabin controller displays the fuel priority mode after receiving the vehicle driving mode setting of the vehicle controller. In practice, to avoid repeated voice prompts when the vehicle continuously satisfies the second situation of rapid drop in power, the above voice prompt is performed only once in each driving cycle.

[0104] The embodiments provide the user with the operation of switching the vehicle driving mode by voice confirmation prompt, so that the driver can choose whether to switch the driving mode according to the real-time demand, improve the operation flexibility and control force of the vehicle driving mode control under the condition of rapid drop in battery power, and ensure that the vehicle can be adjusted to the most suitable driving mode in time under the second situation of rapid drop in power, thereby improving the intelligent level of vehicle control.

[0105] ​In some optional embodiments, when the vehicle is in the third situation of rapid battery power drop, the vehicle is controlled to perform the user prompt corresponding to the target battery power interval and the target power generation control strategy, including:

[0106] When the third situation of rapid battery power drop is determined, a third pop-up prompt is displayed on the instrument or screen of the vehicle.

[0107] When the fourth situation of rapid battery power drop is determined, the power generation power of the generator is controlled using the target power generation control strategy, and 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, wherein Pr represents the requested power generation power, V max2 represents the actual driving speed, V max1 represents the maximum battery protection speed, V min represents the minimum vehicle speed, K represents the SOC drop percentage compensation value coefficient, and K is linearly proportional to the SOC drop value, Pc represents the driving request power, and Pa represents the accessory request power.

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

[0110] Specifically, the way of displaying the third pop-up prompt and the fourth pop-up prompt on the instrument or screen is not unique, including but not limited to repeatedly displaying the first pop-up prompt at intervals, or displaying the first pop-up prompt within a fixed time period. Moreover, the specific content of the third pop-up prompt and the fourth pop-up prompt can be the same or different, and the embodiments of the present application do not limit this.

[0111] For example, in combination Figure 2 with the extended-range electric vehicle, when the vehicle is in the third situation of rapid battery power drop, the vehicle controller sends a third signal that the battery power is dropping too fast, and the instrument controller receives the third signal and then displays a pop-up prompt for 5s: In pure electric driving, the battery power is low, the vehicle speed is too high, the range extender cannot be started, and it is recommended to control the vehicle speed within 100kph; and when the vehicle continues to meet the third situation of rapid battery power drop, it is prompted again every 1min: In pure electric driving, the vehicle speed is too high, the battery power is dropping too fast, and it is recommended to control the vehicle speed within 100kph. In addition, when the vehicle is in the fourth situation of rapid battery power drop, the vehicle controller adjusts the power generation request power of the generator controller to: Pr = Pc * K * (V max 2-V min ) / (V max1 -Vmin )+Pa; and the vehicle controller sends a fourth signal of the power battery power dropping too fast, and the instrument controller displays a pop-up prompt for 5s after receiving the fourth signal: the vehicle speed is too high, the power generation cannot maintain the battery power, and it is suggested that the vehicle speed be controlled within 140 kph. Similarly, the vehicle continuously meets the fourth condition of the power dropping too fast, and the prompt is displayed again every 3 min: the vehicle speed is too high, the power generation cannot maintain the battery power, and it is suggested that the vehicle speed be controlled within 140 kph.

[0112] The embodiment detects the power dropping too fast, calculates and adjusts the power generation of the generator according to a specific algorithm, and displays corresponding prompts to the driver, thereby providing an intelligent, timely and efficient power management and prompting mechanism, and improving the safety and energy utilization efficiency of the vehicle.

[0113] In some optional embodiments, when the vehicle exists the condition of the power dropping too fast in the step S204, the vehicle is controlled to execute the user prompt and the target power generation control strategy corresponding to the target battery power interval, including:

[0114] When the vehicle exists the fifth condition of the power dropping too fast, a fifth pop-up prompt is displayed on the instrument or screen of the vehicle, part or all of the vehicle-mounted electrical equipment is disabled, or / and the maximum working power of part or all of the vehicle-mounted electrical equipment is limited, the target power generation 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 by using the following calculation formula:

[0115] Pr = Pc * K * (V max 2-V min ) / (V max1 -V min )+Pa, wherein Pr represents the requested power generation, V max2 represents the actual driving speed, V max1 represents the maximum power protection speed, V min represents the minimum speed, K represents the SOC drop percentage compensation value coefficient, and K is linearly proportional to the SOC drop value, Pc represents the driving request power, and Pa represents the accessory request power.

[0116] When the vehicle exists the sixth condition of the power dropping too fast, a sixth pop-up prompt is displayed on the instrument or screen of the vehicle, part or all of the vehicle-mounted electrical equipment is disabled, or / and the maximum working power of part or all of the vehicle-mounted electrical equipment is limited, the target power generation 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 by using the following calculation formula:

[0117] Pr = Pc * K * (V max 2-V min ) / (Vmax1 -V min )+Pa, wherein Pr represents a request power generation, V max2 represents an actual driving speed, V max1 represents a calibrated maximum power generation speed, V min represents a minimum speed, K represents a SOC drop percentage compensation value coefficient, and K is in a linear positive relationship with a SOC drop value, Pc represents a driving request power, and Pa represents an accessory request power.

[0118] When the seventh situation of the rapid drop of the power is determined, a seventh pop-up prompt is displayed on an instrument or a screen of the vehicle, part or all of the on-board electrical equipment is disabled, or / and the maximum working power of part or all of the on-board electrical equipment is limited; the target power generation control strategy is used to control the power generation of the generator, and the target power generation control strategy includes calculating the request power generation of the generator by using the following calculation formula:

[0119] Pr=Pc*K*(V max 2-V min ) / (V max1 -V min )+Pa, wherein Pr represents a request power generation, V max2 represents an actual driving speed, V max1 represents a calibrated maximum power generation speed, V min represents a minimum speed, K represents a SOC drop percentage compensation value coefficient, and K is in a linear positive relationship with a SOC drop value, Pc represents a driving request power, and Pa represents an accessory request power.

[0120] Specifically, compared with other rapid drop of the power situations, the embodiment increases the maximum working power limitation and the disable control of the electrical equipment on the vehicle. Therefore, the display mode of the fifth pop-up prompt, the sixth pop-up prompt and the seventh pop-up prompt in the embodiment can refer to the above-mentioned embodiments, which will not be described 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 recover and improve the power of the power battery.

[0122] Further, in an optional embodiment, when the vehicle is in the rapid drop of the power situation, the vehicle is controlled to execute the user prompt and the target power generation control strategy corresponding to the target battery power interval, and further includes:

[0123] detecting whether the vehicle is in a charging state;

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

[0125] If the vehicle is detected to be charging, the process will proceed to the step of determining the current battery charge level, and the pop-up prompt will no longer be displayed. The disablement and maximum power limit of some or all on-board electrical devices will be lifted.

[0126] Determining the current battery level also includes:

[0127] If the battery charge is greater than the third charge threshold, the process returns to the step of determining the target battery charge range corresponding to the current battery charge based on multiple battery charge ranges that are pre-divided across the entire battery charge range.

[0128] This embodiment detects whether the power battery is being recharged by adding a determination of the charging plug status on the vehicle. If the power battery is being recharged, the battery charge will gradually increase, thus changing the battery charge level. The determination of the battery charge range corresponding to the battery charge level after the charge level change, as well as the determination of the situation of rapid charge drop, will also change accordingly, making the control of rapid battery charge drop more perfect.

[0129] For example, combining Figure 2 In some range-extended electric vehicles, if the vehicle's battery charge meets the following conditions: 5% < SOC ≤ 10%, and the average vehicle speed within 5 minutes > 150 kph and the charging port is not plugged in, then the vehicle is considered to be experiencing a rapid battery drop (the fifth scenario). In this case, the vehicle controller continuously sends a low battery signal, and the instrument panel controller, upon receiving this signal, continuously displays a pop-up message: "Battery charge is low, the vehicle will soon stop working." If the SOC ≥ 12% or the charging port is plugged in, the notification and power limitation will cease. Simultaneously, the vehicle controller limits the maximum available power of the air conditioning controller (AC) to 1 kW and the available power of the passenger compartment PTC (Positive Temperature Coefficient) to 0 kW. Furthermore, the range extender is set to startable mode, and the generator's target power generation control strategy is adjusted in the same way as the other rapid battery drop scenarios, which will not be elaborated here.

[0130] If the battery power of the vehicle meets the condition: 3% < SOC < 5%, and the average vehicle speed is > 150 kph within 3 min and the non-plug-in state, it is determined that the vehicle is in the sixth case of rapid power drop, and the vehicle controller continuously sends the sixth signal of the battery power being extremely low. The instrument controller receives the sixth signal and continuously pops up a prompt: the battery power is low, and the vehicle will stop working. In addition, the vehicle controller limits the maximum available power of the air conditioner controller AC to 1 kw, and the available power of the passenger compartment PTC to 0 kw. In addition, if the plug-in enters the charging state, the power will not be prompted and limited. If the battery power rises to the range 12 > SOC > 7%, the prompt: the battery power is low, and the vehicle will stop working, and the power limitation is the same as above. In addition, the range extender is adjusted to the startable state, and the target power generation control strategy of the generator is adjusted as described above in other cases of rapid power drop, which will not be repeated here.

[0131] If the battery power of the vehicle meets the condition: SOC < 3%, and the average vehicle speed is > 140 kph within 1 min and the non-plug-in state, it is determined that the vehicle is in the seventh case of rapid power drop. At this time, the vehicle controller continuously sends the seventh signal of the battery power being extremely low. The instrument controller receives the seventh signal and continuously pops up a prompt: the battery power is low, and the vehicle will stop working. In addition, the vehicle controller limits the maximum available power of the air conditioner controller AC to 1 kw, and the available power of the passenger compartment PTC to 0 kw. In addition, once the plug-in is detected to enter the charging state, the power will not be prompted and limited. When the battery power rises to 7 > SOC > 5%, the prompt: the battery power is extremely low, and the vehicle will stop working, and the power limitation is the same as above. In addition, the range extender is adjusted to the startable state, and the target power generation control strategy of the generator is adjusted as described above in other cases of rapid power drop, which will not be repeated here.

[0132] Specifically, for the target power generation control strategy, according to the calculation formula provided by the 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 ) are used to calculate the proportion of the current vehicle speed relative to the highest power protection speed, K is a SOC drop compensation coefficient, which changes with the SOC drop value. The lower the SOC, the higher the K value. Finally, the calculated proportion is multiplied by the drive request power Pc and added to the accessory request power Pa to obtain the request power Pr.

[0133] The embodiment is aimed at the range-extending electric vehicle in the driving power>power generation power scenario, causing the power battery power to rapidly decrease, giving the user relevant reminders and power generation control strategies, improving the user driving experience and user satisfaction.

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

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

[0136] Referring to Figure 4 In the third embodiment of the present application, a control device for rapid power decrease of a range-extending electric vehicle is provided, comprising:

[0137] The power monitoring module 401 is configured to monitor whether there is a case of rapid power decrease caused by high-speed driving in a preset power interval of the vehicle, the preset power interval being at least one battery power interval pre-divided by the vehicle power battery;

[0138] The strategy matching module 402 is configured to, if there is a case of rapid power decrease caused by high-speed driving in the preset power interval of the vehicle, determine the power generation demand compensated by the vehicle speed based on the vehicle speed parameter, and determine the requested power generation power of the generator according to the power generation demand compensated by the vehicle speed and the whole 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 power of the generator based on the requested power generation power.

[0140] According to the technical solutions provided by the embodiments of the present application, by monitoring the battery power of the vehicle, when there is a case of rapid power decrease caused by high-speed driving in the preset power interval of the vehicle, the power generation demand compensated by the vehicle speed is determined based on the vehicle speed parameter, and the requested power generation power of the generator is determined according to the power generation demand compensated by the vehicle speed and the whole vehicle energy consumption demand, so as to control the power generation power of the motor, thereby delaying and maintaining the power decrease speed of the power battery, improving the user driving experience and user satisfaction.

[0141] In some optional embodiments, the preset battery power interval includes a first battery power interval; the power monitoring module 401 is configured to detect whether the vehicle satisfies a first battery power rapid drop determination condition, the first battery power rapid drop determination condition including: whether the average vehicle speed in a first preset time period is greater than or equal to a preset speed threshold, the power consumption exceeds a first power threshold, and the range extender is not started; if the vehicle satisfies the first battery power rapid drop determination condition, it is determined that the vehicle is in a first case of battery power rapid drop, and whether the vehicle satisfies a second battery power rapid drop determination condition is detected, the second battery power rapid drop determination condition including: whether the average vehicle speed in 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 battery power rapid drop determination condition, it is determined that the vehicle is in a second case of battery power rapid drop; in the first case of battery power rapid drop of the vehicle, a user reminder corresponding to the first case is displayed on the instrument or screen of the vehicle; in the second case of battery power rapid drop of the vehicle, the following steps are performed: determining the speed compensation power generation demand based on the vehicle speed parameter, and determining the requested power generation power of the generator according to the speed compensation power generation demand and the whole vehicle energy consumption demand.

[0142] In some optional embodiments, the preset battery power interval includes a second battery power interval; the power monitoring module 401 is configured to detect whether the vehicle satisfies a third battery power rapid drop determination condition, the third battery power rapid drop determination condition including: whether the average vehicle speed in 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 satisfies the third battery power rapid drop determination condition, it is determined that the vehicle is in a third case of battery power rapid drop, and whether the vehicle satisfies a fourth battery power rapid drop determination condition is detected, the fourth battery power rapid drop determination condition including: whether the average vehicle speed in a first preset time period is greater than or equal to a preset speed threshold, the power consumption exceeds a second power threshold, and the range extender is not started; if the vehicle satisfies the fourth battery power rapid drop determination condition, it is determined that the vehicle is in a fourth case of battery power rapid drop.

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

[0144] The first reminding module 404 is configured to display a third user reminder corresponding to the third case on the instrument or screen of the vehicle when it is determined that the vehicle is in the third case of battery power rapid drop, and display a fourth user reminder corresponding to the fourth case on the instrument or screen of the vehicle when it is determined that the vehicle is in the fourth case of battery power rapid drop.

[0145] In some optional embodiments, the preset battery 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 in the first preset time period is greater than or equal to the preset speed threshold, if yes, determine that the vehicle is in the fifth situation of rapid battery power decline; if the battery power is less than or equal to the fourth power threshold, determine whether the average speed of the vehicle in the third preset time period is greater than or equal to the preset speed threshold, if yes, determine that the vehicle is in the sixth situation of rapid battery power decline; if the battery power is less than or equal to the fifth power threshold, determine whether the average speed of the vehicle in the fourth preset time period is greater than or equal to the preset speed threshold, if yes, determine that the vehicle is in the seventh situation of rapid battery power decline.

[0146] The control device for rapid battery power decline of the extended-range electric vehicle further includes:

[0147] The second reminding module 405 is configured to display a fifth user reminder corresponding to the fifth situation on the instrument or screen of the vehicle when it is determined that the vehicle is in the fifth situation of rapid battery power decline; display a sixth user reminder corresponding to the sixth situation on the instrument or screen of the vehicle when it is determined that the vehicle is in the sixth situation of rapid battery power decline, and limit the maximum working power of part or all of the vehicle-mounted electrical equipment; display a seventh user reminder corresponding to the seventh situation on the instrument or screen of the vehicle when it is determined that the vehicle is in the seventh situation of rapid battery power decline, and disable part or all of the vehicle-mounted electrical equipment.

[0148] In some optional embodiments, the control device for rapid battery power decline of the 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, 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 remove the disablement and maximum working power limitation of part or all of the vehicle-mounted electrical equipment, or remove the disablement of part or all of the vehicle-mounted electrical equipment.

[0150] In some optional embodiments, the strategy matching module 402 is configured to calculate a first speed difference value of the calibrated maximum power-saving vehicle speed and the minimum vehicle speed, and a second speed difference value of the actual driving vehicle speed and the minimum vehicle speed, respectively; calculate a first product of a ratio of the first speed difference value and the second speed difference value and a SOC percentage drop compensation value coefficient based on the ratio, and take the first product as the vehicle speed compensation power generation demand, wherein the SOC percentage drop compensation value coefficient is in a linear positive proportional relationship with the SOC drop value of the vehicle power battery; calculate a second product of the first product and the driving request power, and add the second product and the accessory request power to obtain the request power generation power of the generator.

[0151] In some optional embodiments, the control device for rapid drop of the extended-range electric vehicle's power further comprises:

[0152] The voice reminding module 407 is configured to, after controlling the generator to start power generation and adjusting the power generation power of the generator based on the request power generation power, use the vehicle-mounted voice system to issue a voice confirmation prompt for whether to switch the driving mode to the fuel priority mode; when receiving a voice reply of no, keep the current driving mode unchanged; when receiving a voice reply of yes, or not receiving a voice reply, switch the driving mode to the fuel priority mode.

[0153] It should be understood that the size of the serial number of each step in the above embodiments does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

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

[0155] The extended-range electric vehicle is a car that combines pure electric and traditional fuel power, mainly driven by an electric motor, but when the battery power is insufficient, it will start the range extender (usually an internal combustion engine) to charge the battery, thereby extending the cruising range. Its main structure includes but is not limited to: power battery, electric motor, range extender (internal combustion engine), vehicle controller (VCU, the abbreviation of Vehicle Control Unit) and battery management system (BMS).

[0156] The battery management system 52 is specially used for monitoring and managing 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 voltage, current, temperature, SOC, SOH and other data to the vehicle controller, and the vehicle controller determines the target battery power interval corresponding to the current battery power of the vehicle and other operations according to the data. In addition, the vehicle controller can also send instructions to the battery management system to adjust the battery charging / discharging rate, enable or disable the battery cooling system, etc.

[0158] In some optional embodiments, referring to 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. The processor 511 implements the steps in each of the above method embodiments when executing the computer program 513. Alternatively, the processor 511 implements the functions of each module in each of the above device embodiments when executing the computer program 513.

[0159] The vehicle controller can include but not limited to the processor 511 and the memory 512. Those skilled in the art can understand that Figure 6 is only an example of the vehicle controller and does not constitute a limitation on the vehicle controller, and can include more or fewer components than those shown in Figure 6 , or different components.

[0160] The processor 511 can 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 can be an internal storage unit of the vehicle controller, for example, a hard disk or a memory of the vehicle controller. The memory 512 can also be an external storage device of the vehicle controller, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. The memory 512 can also include both internal storage units and external storage devices of the vehicle controller. The memory 512 is used to store computer programs and other programs and data required by the electronic device.

[0162] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules is taken as an example, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional module in the embodiment can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of software functional unit.

[0163] The integrated module, if realized in the form of software functional unit and sold or used as an independent product, can be stored in a readable storage medium (for example, a computer readable storage medium). Based on such understanding, all or part of the processes in the above-mentioned embodiment methods can also be completed by a computer program instructing related hardware, and the computer program can be stored in a computer readable storage medium. The computer program can be executed by a processor to implement the steps of each method embodiment. The computer program can include computer program code, which can be in the form of source code, object code, executable file or some intermediate form, etc. The computer readable storage medium can include any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier wave signal, telecommunication signal and software distribution medium, etc.

[0164] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A method for controlling rapid decrease of electric power of a range-extended electric vehicle, characterized by, The method comprises the steps of: monitoring whether high-speed driving causes rapid power consumption in a preset power range, wherein the preset power range is at least one battery power range divided by the battery power range of the vehicle power battery in advance; if high-speed driving causes rapid power consumption in the preset power range, determining a vehicle speed compensation power generation demand based on a vehicle speed parameter, and determining a requested power generation power of the generator according to the vehicle speed compensation power generation demand and a whole vehicle energy consumption demand; controlling the generator to start power generation, and adjusting the power generation power of the generator based on the requested power generation power; 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 whole vehicle energy consumption demand, comprises: calculating a first speed difference value of a calibration maximum power protection vehicle speed and a minimum vehicle speed, and a second speed difference value of an actual driving vehicle speed and the minimum vehicle speed, respectively; calculating a first product of a ratio of the first speed difference value and the second speed difference value and a SOC percentage compensation value coefficient, and taking the first product as the vehicle speed compensation power generation demand, wherein the SOC percentage compensation value coefficient is in a linear positive proportional relationship with a SOC drop value of the vehicle power battery; calculating a second product of the first product and a driving request power, and adding the second product and an accessory request power to obtain the requested power generation power of the generator.

2. The method of claim 1, wherein, The preset power range comprises a first battery power range; The monitoring whether high-speed driving causes rapid power consumption in the preset power range comprises: detecting whether the vehicle meets a first rapid power consumption determination condition, wherein the first rapid power consumption determination condition comprises whether an average vehicle speed in a first preset time length is greater than or equal to a preset speed threshold, a power consumption is greater than a first power threshold, and a range extender is not started; if the vehicle meets the first rapid power consumption determination condition, determining that the vehicle appears a first condition of rapid power consumption, and detecting whether the vehicle meets a second rapid power consumption determination condition, wherein the second rapid power consumption determination condition comprises whether an average vehicle speed in a second preset time length 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 containing 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 power consumption determination condition, determining that the vehicle appears a second condition of rapid power consumption; in the first condition of rapid power consumption of the vehicle, displaying a user prompt corresponding to the first condition on an instrument or a screen of the vehicle; in the second condition of rapid power consumption of the vehicle, performing the steps 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 whole vehicle energy consumption demand.

3. The method of claim 2, wherein, The preset power range comprises a second battery power range, and the first battery power range and the second battery power range are two different power ranges; The monitoring whether high-speed driving causes rapid power consumption in the preset power range comprises: The system detects whether the vehicle meets the third rapid battery drop determination criteria, which include: whether the average vehicle speed within a first preset time period is greater than or equal to a preset speed threshold, and whether the range extender is not activated. If the vehicle meets the third rapid battery drop determination condition, it is determined that the vehicle has experienced the third situation of rapid battery drop, and it is checked whether the vehicle meets the fourth rapid battery drop determination condition. The fourth rapid battery drop determination condition includes: whether the average vehicle speed within the first preset time period is greater than or equal to the preset speed threshold, whether the power consumption exceeds the second power threshold, and whether the range extender is not started. If the vehicle meets the fourth condition for rapidly decreasing battery level, then the vehicle is determined to have experienced the fourth condition of rapidly decreasing battery level.

4. The method of claim 3, wherein, After monitoring whether the vehicle experiences a rapid battery drain due to high-speed driving within a preset battery range, the process also includes: When a third situation is determined to be a rapid decrease in vehicle battery power, a third user alert corresponding to the third situation will be displayed on the vehicle's instrument panel or screen; When a fourth situation is detected, indicating a rapid decrease in vehicle battery power, a fourth user alert corresponding to the fourth situation will be displayed on the vehicle's instrument panel or screen.

5. The method of claim 3, wherein, The preset power range includes a third battery power range, and the first battery power range, the second battery power range and the third battery power range are mutually exclusive ranges. The monitoring includes whether the vehicle experiences a rapid drop in battery power due to high-speed driving within a preset battery range, including: Determine the current battery level: If the battery charge is less than or equal to the third charge threshold, determine whether the vehicle's average speed within the first preset time period is greater than or equal to the preset speed threshold. If so, determine that the vehicle has experienced a fifth situation where the battery charge drops rapidly. If the battery charge is less than or equal to the fourth charge threshold, determine whether the vehicle's average speed within the third preset time period is greater than or equal to the preset speed threshold. If so, determine that the vehicle has experienced the sixth situation of rapid battery depletion. If the battery charge is less than or equal to the fifth charge threshold, determine whether the vehicle's average speed within the fourth preset time period is greater than or equal to the preset speed threshold. If so, determine that the vehicle has experienced the seventh situation of rapid battery depletion. After monitoring whether the vehicle experiences a rapid battery drain due to high-speed driving within a preset battery range, the process also includes: When the vehicle is determined to be in the fifth situation of rapidly decreasing battery power, a fifth user alert corresponding to the fifth situation will be displayed on the vehicle's instrument panel or screen; When the vehicle is determined to be experiencing a sixth situation where the battery level is rapidly decreasing, a sixth user alert corresponding to the sixth situation will be displayed on the vehicle's instrument panel or screen, and the maximum operating power of some or all on-board electrical equipment will be limited. When the vehicle is identified as experiencing a seventh situation where the battery level is rapidly decreasing, a seventh user alert corresponding to the seventh situation will be displayed on the vehicle's instrument panel or screen, and some or all on-board electrical devices will be disabled.

6. The method of claim 5, wherein, Also includes: Check if the vehicle is charging; If the vehicle is detected to be not charging, proceed to the step of determining the current battery charge level. 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 release the disabling and maximum working power limit of part or all of the vehicle-mounted electrical equipment, or release the disabling of part or all of the vehicle-mounted electrical equipment.

7. The method according to any one of claims 1 to 6, characterized in that, In the first case of rapid power drop of the vehicle, further comprising: Using the vehicle-mounted voice system, issuing a voice confirmation prompt for whether to switch the driving mode to the fuel priority mode; When receiving a voice reply of no, keeping the current driving mode unchanged; When receiving a voice reply of yes, or not receiving a voice reply, switching the driving mode to the fuel priority mode.

8. A control device for rapid battery depletion in a range-extended electric vehicle, characterized in that, Comprising: The power monitoring module is configured to monitor whether there is a case of rapid power drop caused by high-speed driving in a preset power interval, the preset power interval being at least one battery power interval pre-divided by the vehicle power battery; The strategy matching module is configured to, if there is a case of rapid power drop caused by high-speed driving in the preset power interval, determine a vehicle speed compensation power generation demand based on a vehicle speed parameter, and determine a requested power generation power of the generator according to the vehicle speed compensation power generation demand and a whole vehicle energy consumption demand; The strategy response module is configured to control the generator to start power generation, and adjust the power generation power of the generator based on the requested power generation power; The strategy matching module is specifically configured to: calculate a first speed difference value of the calibrated highest power protection vehicle speed and the minimum vehicle speed, and a second speed difference value of the actual driving vehicle speed and the minimum vehicle speed; based on the ratio of the first speed difference value and the second speed difference value, calculate a first product of the ratio and a SOC percentage drop compensation value coefficient, and take the first product as the vehicle speed compensation power generation demand, wherein the SOC percentage drop compensation value coefficient is in a linear positive proportional relationship with the SOC drop value of the vehicle power battery; calculate a second product of the first product and the driving request power, and add the second product and the accessory request power to obtain the requested power generation power of the generator.

9. A range-extended electric vehicle, comprising a vehicle controller and a battery management system, the vehicle controller being connected with the battery management system and comprising at least a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that, The processor executes the computer program to realize the steps of the method of any one of claims 1 to 7.

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