Range-extended electric vehicle, energy control method, device and storage medium

Abstract

The present invention discloses a range-extended electric vehicle, an energy control method, a device and a storage medium, belonging to the field of range-extended electric vehicles. When the range-extended electric vehicle is in a preset low-temperature working condition, by setting a voltage control mode, the high-voltage bus voltage is made equal to the power battery voltage, so that the power battery does not charge or discharge. Thus, it is possible to start the range extender to generate electricity under the preset low-temperature working condition, provide energy for the vehicle, and neither damage the power battery nor obtain better and more stable power performance and driving experience.

Description

Technical Field

[0001] The present invention relates to the field of range-extended electric vehicles, and particularly to a range-extended electric vehicle, an energy control method, a device, and a storage medium. Background Art

[0002] Currently, the energy control strategy of range-extended electric vehicles is usually that the vehicle controller calculates the vehicle's required power and controls the range extender to respond to this power demand. If there is an imbalance between the power generation of the range extender and the power consumption of the vehicle due to reasons such as power calculation deviation, actual operating condition deviation, and fewer distribution points of the power generation operating condition, at this time, the power battery needs to charge or discharge to achieve vehicle power balance.

[0003] However, in some special operating conditions, such as low-temperature conditions, the power battery of a range-extended electric vehicle almost loses its continuous charging ability, and an unreasonable charging current will cause damage to the power battery. Existing energy management strategies usually do not allow the range extender to start to avoid continuous charging of the power battery when the temperature of the power battery is lower than the temperature allowing continuous charging. At this time, the vehicle is only allowed to run purely on electricity until the temperature of the power battery is heated to the temperature allowing continuous charging by components such as PTC (Positive Temperature Coefficient) thermistors and battery heating films, and then the range extender is allowed to start generating electricity and continuously charge the power battery.

[0004] This existing energy management strategy for range-extended electric vehicles will seriously affect the vehicle's power performance and driving experience, and even in some extreme operating conditions, there will be a serious power shortage situation of the power battery, resulting in the vehicle being unable to drive. Summary of the Invention

[0005] The main purpose of the present invention is to provide a range-extended electric vehicle, an energy control method, a device, and a storage medium, aiming to solve the technical problem that a range-extended electric vehicle cannot operate stably under low-temperature conditions.

[0006] To achieve the above object, the present invention provides a range-extended electric vehicle, which includes a high-voltage bus (1), a generator controller (2), a first three-phase high-voltage wire (3), a generator (4), an engine (5), a power battery system (6), a high-voltage auxiliary drive controller (7), a drive motor (8), a second three-phase high-voltage wire (9), and a drive motor controller (10);

[0007] The engine (5) provides energy for the generator (4). The generator (4) is electrically connected to the generator controller (2) through the first three-phase high-voltage line (3). The drive motor (8) is electrically connected to the drive motor controller (10) through the second three-phase high-voltage line (9). The generator controller (2), the power battery system (6), the high-voltage auxiliary drive controller (7), and the drive motor controller (10) are electrically connected to each other in pairs through the high-voltage bus (1).

[0008] To achieve the above object, the present invention provides an energy control method for an extended-range electric vehicle, which is applied to the extended-range electric vehicle as described above, and includes:

[0009] When the extended-range electric vehicle is in a preset low-temperature working condition, the generator controller (2) is made to enter the voltage control mode;

[0010] In the voltage control mode, the battery voltage of the power battery system (6) is obtained, the output voltage of the generator controller (2) is controlled to be the battery voltage, and based on the high-voltage bus (1), the auxiliary drive voltage of the high-voltage auxiliary drive controller (7) and the drive voltage of the drive motor controller (10) are made to be the battery voltage;

[0011] According to the low-temperature power consumption demand power of the high-voltage auxiliary drive controller (7) and the drive motor controller (10) of the extended-range electric vehicle, the operation of the range extender composed of the generator (4) and the engine (5) is controlled to adjust the current of the generator controller (2), so that the output power of the generator controller (2) is equal to the low-temperature power consumption demand power, and the drive motor (8) drives the extended-range electric vehicle.

[0012] Optionally, the energy control method for the extended-range electric vehicle further includes:

[0013] When the extended-range electric vehicle is in a preset range-extending power generation working condition, the generator controller (2) is made to enter the range-extending power generation mode;

[0014] In the range-extending power generation mode, the range-extending power consumption demand power of the power battery system (6), the high-voltage auxiliary drive controller (7), and the drive motor controller (10) of the extended-range electric vehicle is obtained;

[0015] The operation of the range extender composed of the generator (4) and the engine (5) is controlled so that the output power of the generator controller (2) is equal to the range-extending power consumption demand power, and the drive motor (8) drives the extended-range electric vehicle.

[0016] Optionally, after the step of making the output power of the generator controller (2) equal to the low-temperature power consumption demand power, the method further includes:

[0017] When the voltage on the high-voltage bus (1) changes and is not equal to the battery voltage of the power battery system (6), obtain the average value of the current change of the power battery system (6) within a preset duration;

[0018] According to the average value of the current change, the internal resistance of the power battery system (6), and the battery voltage before the change, obtain the battery voltage of the power battery system (6) after the change, and execute the step of making the output voltage of the generator controller (2) be the battery voltage.

[0019] Optionally, after the step of obtaining the battery voltage of the power battery system (6) after the change, the method further includes:

[0020] Adjust the output currents of the high-voltage auxiliary drive controller (7) and the drive motor controller (10) according to the battery voltage after the change to meet the low-temperature power consumption demand power of the range-extended electric vehicle.

[0021] Optionally, the energy control method of the range-extended electric vehicle further includes:

[0022] In the voltage control mode, charge the power battery system (6) with a target pulse current.

[0023] Optionally, before the step of charging the power battery system (6) with a pulse current, the method further includes:

[0024] Pre-set a plurality of pulse current spectra corresponding to different working conditions of the range-extended electric vehicle and different preset temperatures of the power battery system (6);

[0025] Determine a target spectrum according to the actual working condition of the range-extended electric vehicle, and determine the target pulse current corresponding to the actual temperature from the target spectrum.

[0026] Optionally, before the step of charging the power battery system (6) with a pulse current, the method further includes:

[0027] Taking the target pulse current as a reference value, correct the target spectrum according to the reference value and a preset temperature correction coefficient to determine the pulse currents corresponding to the remaining preset temperatures.

[0028] In addition, to achieve the above object, the present invention further provides an energy control device for a range-extended electric vehicle, the device comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, the computer program being configured to implement the steps of the above-mentioned energy control method for a range-extended electric vehicle.

[0029] In addition, to achieve the above object, the present invention further provides a storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing the steps of the above-mentioned energy control method for a range-extended electric vehicle.

[0030] In the energy control method for a range-extended electric vehicle of the present invention, when the range-extended electric vehicle is in a preset low-temperature working condition, the generator controller (2) is made to enter a voltage control mode; in the voltage control mode, the battery voltage of the power battery system (6) is acquired, the output voltage of the generator controller (2) is controlled to be the battery voltage, and based on the high-voltage bus (1), the auxiliary drive voltage of the high-voltage auxiliary drive controller (7) and the drive voltage of the drive motor controller (10) are made to be the battery voltage; according to the low-temperature power consumption demand power of the high-voltage auxiliary drive controller (7) and the drive motor controller (10) of the range-extended electric vehicle, the operation of the range extender composed of the generator (4) and the engine (5) is controlled to adjust the current of the generator controller (2), so that the output power of the generator controller (2) is equal to the low-temperature power consumption demand power, and the drive motor (8) is made to drive the range-extended electric vehicle.

[0031] When the range-extended electric vehicle is in a preset low-temperature working condition, by setting the voltage control mode, the high-voltage bus voltage and the power battery voltage are made equal, so that the power battery does not charge or discharge. Thus, it is possible to start the range extender to generate electricity under the preset low-temperature working condition, provide energy for the vehicle, and neither damage the power battery nor obtain better and more stable power performance and driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application, and those of ordinary skill in the art can obtain other drawings without creative efforts based on these drawings.

[0033] Figure 1 It is a schematic structural diagram of the hardware operating environment involved in the embodiment solution of the present invention;

[0034] Figure 2 It is a schematic diagram of the high-voltage architecture of the range-extended electric vehicle of the present invention;

[0035] Figure 3 It is a schematic flowchart of an embodiment of the energy control method for the range-extended electric vehicle of the present invention.

[0036] In the figure: 1. High-voltage bus; 2. Generator controller; 3. First three-phase high-voltage wire; 4. Generator; 5. Engine; 6. Power battery system; 7. High-voltage auxiliary drive controller; 8. Drive motor; 9. Second three-phase high-voltage wire; 10. Drive motor controller.

[0037] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0038] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] As Figure 1 shown, Figure 1 It is a schematic structural diagram of the device of the hardware operating environment involved in the embodiment solution of the present invention. The device of the hardware operating environment of the embodiment of the present invention may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. Among them, the communication bus 1002 is used to realize the connection communication between these components. The user interface 1003 may include a display screen (Display) and an input unit such as a keyboard (Keyboard). Optionally, the user interface 1003 may further include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0040] Optionally, the devices in the hardware operating environment may further include a camera, an RF (Radio Frequency) circuit, sensors, an audio circuit, a WiFi module, and so on. Among them, the sensors include, for example, a light sensor, a motion sensor, and other sensors. Among them, the ambient light sensor can adjust the brightness of the display screen according to the brightness of the ambient light, and the proximity sensor can turn off the display screen and / or the backlight when the hardware device is moved to the ear. As a kind of motion sensor, the gravity acceleration sensor can detect the magnitude of acceleration in all directions (generally three axes), and can detect the magnitude and direction of gravity when stationary, and can be used in applications for identifying the posture of the hardware device (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tapping), etc.; of course, the hardware device can also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., which will not be elaborated here.

[0041] Those skilled in the art can understand that Figure 1 the device structure shown in does not constitute a limitation on the device, and may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements.

[0042] As Figure 1 shown, in the memory 1005 as a computer storage medium, there may be included an operating system, a network communication module, a user interface module, and a computer program.

[0043] In Figure 1 the device shown, the network interface 1004 is mainly used to connect to the background server and communicate with the background server for data; the user interface 1003 is mainly used to connect to the client (user side) and communicate with the client for data; and the processor 1001 can be used to call the computer program stored in the memory 1005 and perform the following operations:

[0044] When the range-extended electric vehicle is in a preset low-temperature working condition, make the generator controller (2) enter the voltage control mode;

[0045] In the voltage control mode, obtain the battery voltage of the power battery system (6), control the output voltage of the generator controller (2) to be the battery voltage, and based on the high-voltage bus (1), make the auxiliary drive voltage of the high-voltage auxiliary drive controller (7) and the drive voltage of the drive motor controller (10) be the battery voltage;

[0046] According to the low-temperature power consumption requirements of the high-voltage auxiliary drive controller (7) and the drive motor controller (10) of the range-extended electric vehicle, control the operation of the range extender composed of the generator (4) and the engine (5) to adjust the current of the generator controller (2), so that the output power of the generator controller (2) is equal to the low-temperature power consumption requirement, and make the drive motor (8) drive the range-extended electric vehicle.

[0047] Further, the processor 1001 may call the computer program stored in the memory 1005 and further perform the following operations:

[0048] When the range-extended electric vehicle is in a preset range-extended power generation working condition, make the generator controller (2) enter the range-extended power generation mode;

[0049] In the range-extended power generation mode, obtain the range-extended power consumption requirements of the power battery system (6), the high-voltage auxiliary drive controller (7) and the drive motor controller (10) of the range-extended electric vehicle;

[0050] Control the operation of the range extender composed of the generator (4) and the engine (5) so that the output power of the generator controller (2) is equal to the range-extended power consumption requirement, and make the drive motor (8) drive the range-extended electric vehicle.

[0051] Further, the processor 1001 may call the computer program stored in the memory 1005 and further perform the following operations:

[0052] After the step of making the output power of the generator controller (2) equal to the low-temperature power consumption requirement, it further includes:

[0053] When the voltage on the high-voltage bus (1) changes and is not equal to the battery voltage of the power battery system (6), obtain the average value of the current change of the power battery system (6) within a preset time period;

[0054] According to the average value of the current change, the internal resistance of the power battery system (6) and the battery voltage before the change, obtain the battery voltage after the change of the power battery system (6), and perform the step of making the output voltage of the generator controller (2) be the battery voltage.

[0055] Further, the processor 1001 may call the computer program stored in the memory 1005 and further perform the following operations:

[0056] After the step of obtaining the battery voltage after the change of the power battery system (6), it further includes:

[0057] Adjust the output currents of the high-voltage auxiliary drive controller (7) and the drive motor controller (10) according to the changed battery voltage to meet the low-temperature power consumption demand of the range-extended electric vehicle.

[0058] Further, the processor 1001 may call the computer program stored in the memory 1005 and further perform the following operations:

[0059] The energy control method of the range-extended electric vehicle further includes:

[0060] In the voltage control mode, charge the power battery system (6) with a target pulse current.

[0061] Further, the processor 1001 may call the computer program stored in the memory 1005 and further perform the following operations:

[0062] Before the step of charging the power battery system (6) with a pulse current, it further includes:

[0063] Pre-set a plurality of pulse current spectra corresponding to different operating conditions of the range-extended electric vehicle and different preset temperatures of the power battery system (6);

[0064] Determine a target spectrum according to the actual operating condition of the range-extended electric vehicle, and determine the target pulse current corresponding to the actual temperature from the target spectrum.

[0065] Further, the processor 1001 may call the computer program stored in the memory 1005 and further perform the following operations:

[0066] Before the step of charging the power battery system (6) with a pulse current, it further includes:

[0067] Taking the target pulse current as a reference value, correct the target spectrum according to the reference value and a preset temperature correction coefficient to determine the pulse currents corresponding to the remaining preset temperatures.

[0068] Refer to Figure 2 , Figure 2 is a schematic diagram of the high-voltage architecture of the range-extended electric vehicle of the present invention. In an embodiment of the range-extended electric vehicle of the present invention, the range-extended electric vehicle includes a high-voltage busbar (1), a generator controller (2), a first three-phase high-voltage line (3), a generator (4), an engine (5), a power battery system (6), a high-voltage auxiliary drive controller (7), a drive motor (8), a second three-phase high-voltage line (9) and a drive motor controller (10);

[0069] The engine (5) provides energy for the generator (4); the generator (4) is electrically connected to the generator controller (2) via the first three-phase high-voltage line (3); the drive motor (8) is electrically connected to the drive motor controller (10) via the second three-phase high-voltage line (9); and the generator controller (2), the power battery system (6), the high-voltage auxiliary drive controller (7), and the drive motor controller (10) are electrically connected in pairs via the high-voltage bus (1).

[0070] The power P of the driving motor controller (10) M It can be calculated using the following formula:

[0071] P M =U M ×I M Formula (1)

[0072] Among them U M represents the voltage of the drive motor controller (10), I M Indicates the current driving the motor controller (10).

[0073] The high-voltage auxiliary drive controller (7) generally includes a DCDC (Direct Current Direct Current, DC conversion) module, an SDCAC (steering Direct Current Alternating Current, steering inverter) module, a BDCAC (brake Direct Current Alternating Current, brake inverter) module and a PTC heating module. In this embodiment, only the above four modules are used as examples. Different manufacturers may include more or fewer different modules.

[0074] The power P of the high-voltage auxiliary drive controller (7) P It can be calculated using the following formula:

[0075] P P =U P ×I P Formula (2)

[0076] Among them U P Represents the voltage of the high-voltage auxiliary drive controller (7), I P Indicates the current of the high-voltage auxiliary drive controller (7).

[0077] Usually the power battery system (6) is equipped with a charge and discharge detection function, and its charge and discharge current I can be measured by a sensor. B The power P of the power battery system (6) B It can be calculated using the following formula:

[0078] P B = I B × I B × R B Equation (3)

[0079] Where R B represents the internal resistance of the power battery system (6). When the demand of the power battery system (6) is for charging, P B is positive; when the demand of the power battery system is for discharging, P B is negative.

[0080] The power P of the generator controller (2) G can be calculated using the following formula, i.e.,

[0081] P G = U G × I G Equation (4)

[0082] Where U G represents the voltage of the generator controller (2), and I G represents the current of the generator controller (2).

[0083] The vehicle controller calculates the total demand power P of the drive motor controller (10), the high-voltage auxiliary drive controller (7), and the power battery system (6) req , i.e.,

[0084] P req = P M + P P + P B Equation (5).

[0085] Referring to Figure 3 , in the first embodiment of the energy control method of the range-extended electric vehicle of the present invention, the energy control method of the range-extended electric vehicle is applied to the range-extended electric vehicle as described above, and the energy control method of the range-extended electric vehicle includes:

[0086] Step S10: When the range-extended electric vehicle is in a preset low-temperature working condition, make the generator controller 2 enter the voltage control mode.

[0087] Step S20: In the voltage control mode, obtain the battery voltage of the power battery system (6), control the output voltage of the generator controller (2) to be the battery voltage, and based on the high-voltage bus (1), make the auxiliary drive voltage of the high-voltage auxiliary drive controller (7) and the drive voltage of the drive motor controller (10) be the battery voltage.

[0088] When the vehicle controller of a range-extended electric vehicle determines that it is in a preset low-temperature working condition, the vehicle controller sends an instruction to the generator controller (2) to control the generator controller (2) to enter the voltage control mode. At this time, the vehicle controller obtains the voltage U of the power battery system (6) B , and sends it to the generator controller (2), and the generator controller (2) controls its output voltage U G to be equal to U B , that is, U G = U B .

[0089] Since the generator controller (2) is in the voltage control mode, the voltage U of the high-voltage bus (1) H is determined by the output voltage U of the generator controller (2) G , that is, U H = U G . The input voltage U of the drive motor controller (10) M is the same as the high-voltage bus voltage U H , that is, U M = U H . The input voltage U of the high-voltage auxiliary drive controller (7) P is the same as the high-voltage bus voltage U H , that is, U P = U H .

[0090] The reason for the charge and discharge of the power battery is that there is a voltage difference between the voltage of the high-voltage bus (1) and the voltage of the power battery. If the voltage of the high-voltage bus (1) is equal to the voltage of the power battery, the power battery will not generate charge and discharge phenomena. Therefore, the control objective of this embodiment is to make the charge and discharge current I of the power battery system (6) B = 0, that is, the voltage of the power battery system (6) should be the same as the voltage on the high-voltage bus (1) so as not to continuously charge the power battery under the preset low-temperature working condition and cause damage to the power battery. That is to say, the voltages of the drive motor controller (10), the high-voltage auxiliary drive controller (7), the power battery system (6), and the generator controller (2) connected in parallel to the high-voltage bus (1) should be the same.

[0091] Step S30: According to the low-temperature power consumption demand of the high-voltage auxiliary drive controller (7) and the drive motor controller (10) of the range-extended electric vehicle, control the operation of the range extender composed of the generator (4) and the engine (5) to adjust the current of the generator controller (2), so that the output power of the generator controller (2) is equal to the low-temperature power consumption demand, and make the drive motor (8) drive the range-extended electric vehicle.

[0092] Under the preset low-temperature working condition, the power battery system (6) does not allow continuous charge and discharge current, and the charge and discharge current I of the power battery system (6) B should be closed-loop controlled to zero, then formula (5) should be transformed into:

[0093] U G ×I G =U M ×I M +U P ×I P Formula (6).

[0094] Therefore, under the preset low-temperature working condition, the low-temperature power consumption demand power of the range-extended electric vehicle does not need to consider the charge and discharge power of the power battery system (6). So the low-temperature power consumption demand power at this time is only the power consumption of the high-voltage auxiliary drive controller (7) and the drive motor controller (10). And since the charge and discharge power of the power battery system (6) does not need to be considered, the power generation power at this time is only the operating power of the range extender composed of the generator (4) and the engine (5).

[0095] Therefore, under the preset low-temperature working condition, the output power of the generator controller (2) is made equal to the low-temperature power consumption demand power, so that the drive motor (8) can drive the range-extended electric vehicle under the condition of power balance, and the power battery system (6) will not be continuously charged.

[0096] In this embodiment, when the range-extended electric vehicle is in the preset low-temperature working condition, the generator controller (2) is made to enter the voltage control mode; in the voltage control mode, the battery voltage of the power battery system (6) is obtained, the output voltage of the generator controller (2) is controlled to be the battery voltage, and based on the high-voltage bus (1), the auxiliary drive voltage of the high-voltage auxiliary drive controller (7) and the drive voltage of the drive motor controller (10) are made to be the battery voltage; according to the low-temperature power consumption demand power of the high-voltage auxiliary drive controller (7) and the drive motor controller (10) of the range-extended electric vehicle, the operation of the range extender composed of the generator (4) and the engine (5) is controlled to adjust the current of the generator controller (2), so that the output power of the generator controller (2) is equal to the low-temperature power consumption demand power, and the drive motor (8) drives the range-extended electric vehicle.

[0097] When the range-extended electric vehicle is in the preset low-temperature working condition, by setting the voltage control mode, the high-voltage bus voltage and the power battery voltage are made equal, so that the power battery does not charge or discharge. Thus, it is possible to start the range extender to generate electricity under the preset low-temperature working condition, provide energy for the vehicle, and neither damage the power battery nor obtain better and more stable power performance and driving experience.

[0098] Further, in the second embodiment of the energy control method for the range-extended electric vehicle of the present invention, based on the above first embodiment, the energy control method for the range-extended electric vehicle further includes:

[0099] When the range-extended electric vehicle is in a preset range-extended power generation working condition, the generator controller 2 is made to enter the range-extended power generation mode;

[0100] In the range-extended power generation mode, obtain the range-extended power consumption demand power of the power battery system (6), the high-voltage auxiliary drive controller (7), and the drive motor controller (10) of the range-extended electric vehicle;

[0101] Control the operation of the range extender composed of the generator (4) and the engine (5) so that the output power of the generator controller (2) is equal to the range-extended power consumption demand power, and make the drive motor (8) drive the range-extended electric vehicle.

[0102] When the range-extended electric vehicle is in the range-extended power generation mode, the vehicle controller controls the engine (5) and the generator (4) to generate power according to the total demand power P req , so that the output power P G of the generator controller (2) is equal to the total vehicle demand power P req , that is, P G = Preq . Therefore, formula (5) can be transformed into

[0103] U G × I G = U M × I M + U P × I P + I B × I B × R B Formula (7).

[0104] Under non-preset low-temperature working conditions, when the range-extended electric vehicle is in a preset range-extended power generation working condition, the generator controller (2) is made to enter the range-extended power generation mode. In the range-extended power generation mode, the range-extended power consumption demand power of the range-extended electric vehicle needs to consider the charge and discharge power of the power battery system (6), and the range-extended power consumption demand power is the power consumption of the power battery system (6), the high-voltage auxiliary drive controller (7), and the drive motor controller (10).

[0105] Among them, when the power battery system (6) needs to be charged, it acts as an electrical device, and its power consumption is positive in formula (7). On the contrary, when the power battery system (6) needs to discharge, it acts as a power generation device, and its power consumption is negative in formula (7).

[0106] In this embodiment, there is no limitation on the method of controlling the operation of the range extender composed of the generator (4) and the engine (5) so that the output power of the generator controller (2) is equal to the power demand for range extension, which may be adjusting the current, adjusting the voltage or other means.

[0107] Further, in the third embodiment of the energy control method of the range-extended electric vehicle of the present invention, based on the above first embodiment, after making the output power of the generator controller (2) equal to the low-temperature power demand in step S30, it further includes:

[0108] When the voltage on the high-voltage bus (1) changes and is not equal to the battery voltage of the power battery system (6), obtain the average value of the current change of the power battery system (6) within a preset time period;

[0109] According to the average value of the current change, the internal resistance of the power battery system (6), and the battery voltage before the change, obtain the battery voltage after the change of the power battery system (6), and execute the step of making the output voltage of the generator controller (2) the battery voltage.

[0110] Since the response time of the engine is much slower than that of the drive motor, when calculating the power demand of the whole vehicle, the vehicle controller should consider the response speed of the engine. Due to reasons such as power calculation deviation and actual operating condition deviation of each controller in the range-extended electric vehicle, the voltage U of the high-voltage bus (1) H and the voltage U of the power battery system (6) B will deviate, that is, U H ≠U B . If there is a voltage difference, it will cause a current change in the power battery system (6). If the continuous current change is not curbed, it will also cause continuous charging of the power battery under the preset low-temperature condition, thus ultimately damaging the battery and affecting the stable operation of the range-extended electric vehicle under the low-temperature condition.

[0111] In this embodiment, a method for solving the above problems is provided.

[0112] After the voltage on the high-voltage bus (1) changes and is not equal to the battery voltage of the power battery system (6), the power battery system (6) starts to monitor the current change of the power battery system (6) within a preset time period (such as 1 s) and takes the average value to obtain the average value of the current change, that is

[0113] I B平均 =∫I B dt / t Formula (8),

[0114] In the formula, I B平均I represents the average charge and discharge current of the power battery system (6), that is, the average value of current change, and t represents the detection time period, that is, the preset duration.

[0115] Then, according to the average value of current change I of the power battery system (6) B平均 , the internal resistance R of the power battery system (6) B and the battery voltage before change (that is, the voltage U of the high-voltage bus (1) before change H ), the voltage value U of the new high-voltage bus (1) is calculated and obtained H新 (that is, the voltage U of the power battery system (6) after change b新 ), that is

[0116] U H新 = U H - I B平均 × R B Formula (9).

[0117] Among them, it may be that due to the very small voltage change, directly measuring the voltage will not be accurate enough. Therefore, considering that the internal resistance of the power battery is small, the change range of the current measured by the current sensor will be larger and more obvious, and measuring the change of the current will be more accurate.

[0118] Next, using the method of the same voltage control mode in Embodiment 1 of the present invention, based on the battery voltage after change of the power battery system (6), the output power of the generator controller (2) is made equal to the low-temperature power consumption demand power.

[0119] Although there is a deviation between the voltage U of the high-voltage bus (1) H and the voltage U of the power battery system (6) B , and the voltages of each component are adjusted, the actual power still needs to be in a balanced state. Therefore, according to the voltage value of the new high-voltage bus (1), the generator controller (2) adjusts its output voltage to make it equal to the voltage value U of the new high-voltage bus (1) H新 , that is

[0120] U G新 = U H新 Formula (10).

[0121] In the formula, U G新 represents the output voltage of the adjusted generator controller (2).

[0122] The generator controller (2) synchronously adjusts its output current I G新 according to its adjusted output voltage U G新 to keep the output power of the generator controller (2) unchanged before and after the output voltage adjustment, that is

[0123] U G新 IG新 = U G × I G Equation (11).

[0124] Among them, the way to adjust the current can be implemented based on IGBT (Insulated Gate Bipolar Transistor), etc., and the way to adjust the current is not limited in this embodiment.

[0125] Further, in the fourth embodiment of the energy control method of the range-extended electric vehicle of the present invention, based on the above-mentioned third embodiment, after obtaining the battery voltage after the change of the power battery system (6), it further includes:

[0126] Adjust the output currents of the high-voltage auxiliary drive controller (7) and the drive motor controller (10) according to the changed battery voltage to meet the low-temperature power consumption demand power of the range-extended electric vehicle.

[0127] When there is a deviation between the voltage U of the high-voltage bus (1) H and the voltage U of the power battery system (6) B and the power balance of each component is adjusted, the drive motor controller (10) and the auxiliary drive controller (7) need to adjust their output currents accordingly according to the voltage value of the new high-voltage bus (1) to meet their respective power requirements, so that their respective powers also dynamically reach a balanced state. Since then, a voltage balance state is re-established between the high-voltage bus (1) and the power battery system (6), and the charge and discharge current of the power battery system (6) drops to zero.

[0128] Further, in the fifth embodiment of the energy control method of the range-extended electric vehicle of the present invention, based on the above-mentioned first embodiment, the energy control method of the range-extended electric vehicle further includes:

[0129] Charge the power battery system (6) with a target pulse current in the voltage control mode.

[0130] In the above embodiments, the charge and discharge current I of the power battery system (6) B = 0 is used as the control target. Under certain low-temperature working conditions, the charge and discharge current control target of the power battery system (6) can be non-zero. At this time, energy control can also be carried out according to the above process. In the voltage control mode, the power battery system (6) is charged with a pulse current. Among them, the chemical properties of the power battery determine that the power battery can be charged with a pulse current for, for example, 1 second or 2 seconds, and the preset pulse current duration of different types of power batteries is also different. After determining the battery type or model of the range-extended electric vehicle, the pulse current duration can be determined.

[0131] Further, in the sixth embodiment of the energy control method of the range-extended electric vehicle of the present invention, based on the above fifth embodiment, before charging the power battery system (6) with a pulsed current, it further includes:

[0132] Pre-set a plurality of pulse spectra diagrams of pulsed currents corresponding to different operating conditions of the range-extended electric vehicle and different preset temperatures of the power battery system (6);

[0133] Determine a target pulse spectrum diagram according to the actual operating condition of the range-extended electric vehicle, and determine the target pulsed current corresponding to the actual temperature from the target pulse spectrum diagram.

[0134] In this embodiment, a method for charging a power battery under low-temperature conditions is provided.

[0135] Pre-set a plurality of pulse spectra diagrams in the control system of the range-extended electric vehicle. For example, different preset temperatures of -30°C, -25°C, -20°C, -15°C, -10°C, -5°C, 0°C, and different operating conditions with the power battery SOC of 50%, 40%, 30%, 20%, 10% all correspond to a pulsed current of the power battery system (6). The corresponding target pulsed current can be determined by selecting different pulse spectra diagrams according to the actual temperature and actual operating condition of the power battery system (6) currently located, so as to achieve the charge and discharge current target of the power battery system (6). Among them, different types of power batteries correspond to different low-temperature settings. For example, the low temperature of type A battery is 5°, and the low temperature of type B battery is -5°. In this embodiment, it can be determined whether it is in a low-temperature condition according to the type or model of the power battery.

[0136] Further, in the seventh embodiment of the energy control method of the range-extended electric vehicle of the present invention, based on the above fifth embodiment, before charging the power battery system (6) with a pulsed current, it further includes:

[0137] Taking the target pulsed current as a reference value, correcting the target pulse spectrum diagram according to the reference value and a preset temperature correction coefficient to determine the pulsed currents corresponding to the remaining preset temperatures.

[0138] In this embodiment, another method for charging a power battery under low-temperature conditions is provided.

[0139] After determining the target pulsed current, taking the target pulsed current as a reference value, introducing a preset temperature correction coefficient, and correcting the target pulse spectrum diagram based on the reference value and the preset temperature correction coefficient to determine the pulsed currents of the power battery at different preset temperatures except for the preset temperature corresponding to the reference value.

[0140] The above embodiments only use the preset low-temperature working condition as a typical working condition to illustrate the energy control method in the present application. The present application is not limited to only being applicable to the low-temperature working condition, but is applicable to any working condition where the charge and discharge current of the power battery in the power battery system is restricted. Similarly, the present application is not limited to only being applicable to range-extended electric vehicles, and is also applicable to hybrid electric vehicles with a range-extended mode.

[0141] In addition, an embodiment of the present invention also provides an energy control device for a range-extended electric vehicle. The energy control device for the range-extended electric vehicle includes: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the computer program is executed by the processor, it implements the steps of each embodiment of the above-mentioned operation response method for the energy control device of the range-extended electric vehicle.

[0142] In addition, an embodiment of the present invention also provides a readable storage medium. A computer program is stored on the readable storage medium. When the computer program is executed by a processor, it implements the steps of each embodiment of the above-mentioned operation response method for the energy control device of the range-extended electric vehicle.

[0143] The expansion content of the specific implementation manners of the energy control device and the readable storage medium of the range-extended electric vehicle of the present invention is basically the same as that of each embodiment of the above-mentioned operation response method for the energy control device of the range-extended electric vehicle, and will not be repeated here.

[0144] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or system. Without more limitations, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or system including that element.

[0145] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments.

[0146] Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence, or the part that makes a contribution to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions for causing a device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in various embodiments of the present invention.

[0147] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A range-extended electric vehicle, characterized in that, The range-extended electric vehicle includes a high-voltage busbar (1), a generator controller (2), a first three-phase high-voltage wire (3), a generator (4), an engine (5), a power battery system (6), a high-voltage auxiliary drive controller (7), a drive motor (8), a second three-phase high-voltage wire (9), and a drive motor controller (10); The engine (5) provides energy for the generator (4). The generator (4) is electrically connected to the generator controller (2) through the first three-phase high-voltage wire (3). The drive motor (8) is electrically connected to the drive motor controller (10) through the second three-phase high-voltage wire (9). The generator controller (2), the power battery system (6), the high-voltage auxiliary drive controller (7), and the drive motor controller (10) are electrically connected to each other in pairs through the high-voltage busbar (1); When the range-extended electric vehicle is in a preset low-temperature working condition, the generator controller (2) is made to enter a voltage control mode. In the voltage control mode, the output voltage of the generator controller (2) is controlled to be the battery voltage of the power battery system, so that the high-voltage busbar voltage is equal to the battery voltage of the power battery system, and the output power of the generator controller (2) is controlled to be equal to the low-temperature power consumption demand power; After the output power of the generator controller (2) is equal to the low-temperature power consumption demand power, when the voltage on the high-voltage busbar (1) changes and is not equal to the battery voltage of the power battery system (6), the average value of the current change of the power battery system (6) within a preset time duration is obtained; Based on the average value of the current change, the internal resistance of the power battery system (6), and the battery voltage before the change, the battery voltage after the change of the power battery system (6) is obtained, and the step of making the output voltage of the generator controller (2) be the battery voltage is executed.

2. An energy control method for a range-extended electric vehicle, characterized in that, The energy control method of the range-extended electric vehicle is applied to the range-extended electric vehicle as described in claim 1, and includes: When the range-extended electric vehicle is in a preset low-temperature working condition, the generator controller (2) is made to enter a voltage control mode; In the voltage control mode, the battery voltage of the power battery system (6) is obtained, the output voltage of the generator controller (2) is controlled to be the battery voltage, and based on the high-voltage busbar (1), the auxiliary drive voltage of the high-voltage auxiliary drive controller (7) and the drive voltage of the drive motor controller (10) are made to be the battery voltage. Wherein, in the voltage control mode, the high-voltage busbar voltage is equal to the battery voltage of the power battery system; According to the low-temperature power consumption demand power of the high-voltage auxiliary drive controller (7) and the drive motor controller (10) of the range-extended electric vehicle, the operation of the range extender composed of the generator (4) and the engine (5) is controlled to adjust the current of the generator controller (2), so that the output power of the generator controller (2) is equal to the low-temperature power consumption demand power, and the drive motor (8) drives the range-extended electric vehicle; After the step of making the output power of the generator controller (2) equal to the low-temperature power consumption demand power, the method further includes: When the voltage on the high-voltage bus (1) changes and is not equal to the battery voltage of the power battery system (6), obtaining the average value of the current change of the power battery system (6) within a preset time period; According to the average value of the current change, the internal resistance of the power battery system (6), and the battery voltage before the change, obtaining the battery voltage of the power battery system (6) after the change, and performing the step of making the output voltage of the generator controller (2) be the battery voltage.

3. The energy control method for a range-extended electric vehicle according to claim 2, wherein The energy control method of the range-extended electric vehicle further includes: When the range-extended electric vehicle is in a preset range-extended power generation working condition, making the generator controller (2) enter the range-extended power generation mode; In the range-extended power generation mode, obtaining the range-extended power consumption demand power of the power battery system (6), the high-voltage auxiliary drive controller (7), and the drive motor controller (10) of the range-extended electric vehicle; Controlling the operation of the range extender composed of the generator (4) and the engine (5) so that the output power of the generator controller (2) is equal to the range-extended power consumption demand power, and making the drive motor (8) drive the range-extended electric vehicle.

4. The energy control method of the range-extended electric vehicle according to claim 2, characterized in that, After the step of obtaining the battery voltage of the power battery system (6) after the change, the method further includes: Adjusting the output currents of the high-voltage auxiliary drive controller (7) and the drive motor controller (10) according to the battery voltage after the change to meet the low-temperature power consumption demand power of the range-extended electric vehicle.

5. The energy control method of the range-extended electric vehicle according to claim 2, characterized in that The energy control method of the range-extended electric vehicle further includes: In the voltage control mode, charging the power battery system (6) with a target pulse current.

6. The energy control method of the range-extended electric vehicle according to claim 5, wherein Before the step of charging the power battery system (6) with the target pulse current, the method further includes: Pre-setting a plurality of pulse current spectra corresponding to different working conditions of the range-extended electric vehicle and different preset temperatures of the power battery system (6); Determining a target pulse current spectrum according to the actual working condition of the range-extended electric vehicle, and determining the target pulse current corresponding to the actual temperature from the target pulse current spectrum.

7. The energy control method of the range-extended electric vehicle according to claim 6, characterized in that, Before the step of charging the power battery system (6) with the target pulse current, the method further includes: Taking the target pulse current as a reference value, and correcting the target pulse current spectrum according to the reference value and a preset temperature correction coefficient to determine the pulse currents corresponding to the remaining preset temperatures.

8. An energy control device for a range-extended electric vehicle, characterized in that The device includes: a memory, a processor, and a computer program stored on the memory and executable on the processor, and the computer program is configured to implement the steps of the energy control method of the range-extended electric vehicle according to any one of claims 2 to 7.

9. A computer-readable storage medium, characterized in that, A computer program is stored on a computer-readable storage medium, and when the computer program is executed by a processor, it implements the steps of the energy control method of the range-extended electric vehicle according to any one of claims 2 to 7.

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