Control method for range-extended electric vehicles, range-extended electric vehicles and storage media

Abstract

This disclosure provides a control method for a range-extended electric vehicle, a range-extended electric vehicle, and a storage medium. The method includes: when the power battery of the range-extended electric vehicle is in a charging and discharging state, detecting the current temperature and a first power of the power battery; and when the current temperature is less than or equal to a temperature threshold and the first power is less than or equal to a corresponding power threshold, controlling the engine to operate to heat the power battery.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle technology, and more specifically, to a control method for a range-extended electric vehicle, a range-extended electric vehicle, and a computer-readable storage medium. Background Technology

[0002] Range-extended electric vehicles (REEVs) are electric vehicles that replenish their power using fuel when the battery is low. They offer advantages such as zero emissions from pure electric driving, low fuel consumption at low and medium speeds, and no range anxiety. Their working principle is as follows: when the battery is fully charged, it supplies power to the drive motor to meet the vehicle's power needs, and the engine does not operate. When the battery's charge is depleted to a certain level, the engine starts and drives a generator to charge the battery, stopping when fully charged.

[0003] However, if the ambient temperature is too low during the process of the power battery supplying power to the drive motor or the engine driving the generator to charge the power battery, the charging and discharging performance and lifespan of the power battery will be greatly reduced, affecting the vehicle's power consumption and driving experience. Summary of the Invention

[0004] One object of this disclosure is to provide a new technical solution for controlling range-extended electric vehicles.

[0005] According to a first aspect of the present disclosure, a control method for a range-extended electric vehicle is provided, comprising:

[0006] When the power battery of the range-extended electric vehicle is in a charging and discharging state, the current temperature and first power of the power battery are detected.

[0007] When the current temperature is less than or equal to a temperature threshold and the first power is less than or equal to the corresponding power threshold, the engine is controlled to operate in order to heat the power battery.

[0008] Optionally, controlling the engine to operate in order to heat the power battery includes:

[0009] The engine is controlled to heat the water temperature circulation system;

[0010] The water temperature control system heats the power battery.

[0011] Optionally, the method further includes:

[0012] The engine is controlled to drive the generator to supply power to the drive motor, so that the drive motor outputs power to the wheel ends of the range-extended electric vehicle.

[0013] Optionally, if the current temperature is less than or equal to a temperature threshold and the first power is less than or equal to a corresponding power threshold, the method further includes:

[0014] Control the power battery to stop charging and discharging.

[0015] Optionally, if the current temperature is less than or equal to a temperature threshold and the first power is less than or equal to a corresponding power threshold, the method further includes:

[0016] Obtain the current SOC of the power battery;

[0017] When the current SOC is less than or equal to a set first target SOC and the current SOC is greater than or equal to a set second target SOC, the power battery is controlled to stop charging and discharging, and the engine-driven generator is controlled to supply power to the drive motor; wherein the first target SOC is greater than the second target SOC;

[0018] If the current SOC is greater than the first target SOC, the power battery is controlled to supply power to the drive motor, and the engine is controlled to drive the generator to supply power to the drive motor.

[0019] If the current SOC is less than the second target SOC, the engine is controlled to drive the generator to charge the power battery.

[0020] Optionally, the method further includes:

[0021] Determine the target output power of the engine;

[0022] The first target torque of the engine, the second target torque of the generator, and the third target torque of the drive motor are determined based on the target output power.

[0023] The output torque of the engine is controlled according to the first target torque, the output torque of the generator is controlled according to the second target torque, and the output torque of the drive motor is controlled according to the third target torque.

[0024] Optionally, determining the target output power of the engine includes:

[0025] Determine the total power requirement of the range-extended electric vehicle;

[0026] If the required power of the vehicle is less than or equal to the maximum output power of the engine, the target output power is determined to be equal to the required power of the vehicle.

[0027] If the required power of the vehicle is greater than the maximum output power, the target output power is determined to be equal to the maximum output power.

[0028] Optionally, determining the total power requirement of the range-extended electric vehicle includes:

[0029] Determine the accessory power requirement of the range-extended electric vehicle, the wheel-end power requirement of the range-extended electric vehicle, and the second power of the power battery;

[0030] The required power of the whole vehicle is obtained based on the required power of the accessories, the required power of the wheel ends, and the second power.

[0031] Optionally, the method further includes:

[0032] Obtain the actual output power and actual power consumption of the range-extended electric vehicle;

[0033] Based on the actual output power and the actual power consumption, the total vehicle error power of the range-extended electric vehicle is obtained, and the total vehicle demand power is determined based on the total vehicle error power.

[0034] According to a second aspect of this disclosure, a range-extended electric vehicle is also provided, including a processor and a memory for storing a computer program for controlling the processor to perform the method as described in the first aspect of this disclosure.

[0035] According to a third aspect of this disclosure, a computer-readable storage medium is also provided, on which a computer program is stored, which, when executed by a processor, implements the method as described in the first aspect of this disclosure.

[0036] According to the embodiments of this disclosure, when the power battery is in a charging and discharging state, if the current temperature of the power battery is detected to be less than or equal to a temperature threshold and the first power is less than or equal to the corresponding power threshold, the engine of the range-extended electric vehicle is controlled to work to heat the power battery. In this way, when the allowable charging and discharging power of the power battery is limited due to low temperature, the residual heat generated during the engine operation can be used to heat the power battery, so that the power battery can be heated up quickly, which can increase the battery life and improve the driving experience.

[0037] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0039] Figure 1 This is a block diagram of a control system for a range-extended electric vehicle according to an embodiment of the present disclosure;

[0040] Figure 2 This is a flowchart of a control method for a range-extended electric vehicle according to an embodiment of the present disclosure;

[0041] Figure 3 This is a block diagram of a range-extended electric vehicle according to an embodiment of the present disclosure. Detailed Implementation

[0042] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0043] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0044] Techniques, methods, and apparatus known to those skilled in the art in the relevant field may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

[0045] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0047] <System>

[0048] This disclosure provides a control system 1000 for a range-extended electric vehicle, such as... Figure 1 As shown, the control system 1000 of the range-extended electric vehicle may include a vehicle control unit 1100, an engine 1210, an engine management system 1220, a generator 1310, a generator controller 1320, a drive motor 1410, a drive motor controller 1420, a power battery 1500, a battery management system 1600, and a water temperature circulation system 1700.

[0049] Among them, the engine management system 1220, generator controller 1320, drive motor controller 1420, battery management system 1600, and water temperature circulation system 1700 are all connected to the vehicle control unit 1100. The vehicle control unit 1100 can obtain the output power of the engine 1210 from the engine management system 1220, obtain the motor speed and / or power generation of the generator 1310 from the generator controller 1320, obtain the drive motor power of the drive motor 1410 from the drive motor controller 1420, and obtain the temperature, allowable charging power, allowable discharging power, and SOC of the power battery 1500 from the battery management system 1600.

[0050] Furthermore, the vehicle control unit 1100 can also obtain driving demand information from the vehicle, such as the vehicle driving mode and throttle signal.

[0051] Furthermore, the vehicle control unit 1100 can send corresponding target torques to the engine management system 1220, the generator controller 1320, and the drive motor controller 1420, respectively, so that the engine management system 1220 controls the engine 1210 to output the corresponding target torque, the generator controller 1320 controls the generator 1310 to output the corresponding target torque, and the drive motor controller 1420 controls the drive motor 1410 to output the corresponding target torque.

[0052] The vehicle control unit 1100 can also determine, based on the temperature, allowable charging power, allowable discharging power, SOC, etc. obtained from the battery management system 1600, that the power battery 1500 is in a low temperature and low power consumption state, and control the water temperature circulation system 1700 to heat the power battery 1500.

[0053] The generator 1310 can also charge the power battery 1500.

[0054] The water temperature circulation system 1700 may include a heat manager and a heat transfer medium circuit. The heat transfer medium circuit is equipped with a three-way valve. When the heat manager receives a command from the vehicle control unit 1100 to heat the power battery, it controls the opening state of the three-way valve so that the heat generated by the engine 1210 can be exchanged with the power battery through the heat transfer medium in the heat transfer medium circuit to heat the power battery 1500.

[0055] <Method>

[0056] This disclosure provides a control method for a range-extended electric vehicle. This method can be implemented by the control system of the range-extended electric vehicle; specifically, it can be implemented by, for example... Figure 1 The control system 1000 of the range-extended electric vehicle shown is implemented.

[0057] Figure 2 This is a flowchart of a control method for a range-extended electric vehicle according to an embodiment of the present disclosure.

[0058] like Figure 2 As shown, the control method for the range-extended electric vehicle may include the following steps S2100 to S2200:

[0059] Step S2100: When the power battery of the range-extended electric vehicle is in a charging and discharging state, detect the current temperature and first power of the power battery.

[0060] In this embodiment, the output current of the power battery can be detected to determine whether the power battery is in a charging or discharging state.

[0061] In this embodiment, it can be determined that the power battery is not in a charging / discharging state when the output current is 0, and that the power battery is in a charging / discharging state when the output current is not 0.

[0062] Specifically, when the output current is greater than 0, it can be determined that the power battery is in a discharging state; when the output current is less than 0, it can be determined that the power battery is in a charging state.

[0063] Furthermore, the first power can be the current permissible charge and discharge power of the power battery.

[0064] In one embodiment of this disclosure, step S2100 can be executed by the vehicle control unit (VCU). Based on this, the battery management system can detect the temperature of the power battery at a first frequency, upload the detected temperature to the VCU at a second frequency, detect the allowable charge / discharge power of the power battery at a third frequency, and upload the detected allowable charge / discharge power to the VCU at a fourth frequency. The first, second, third, and fourth frequencies can be preset according to the application scenario or specific requirements. The first, second, third, and fourth frequencies can be equal or unequal, and are not limited here.

[0065] In one example, the battery management system may upload the average temperature detected in each temperature upload cycle as the current temperature to the vehicle control unit, and the average allowable charge and discharge power detected in each power upload cycle as the first power to the vehicle control unit.

[0066] In another example, the battery management system may also upload the latest detected temperature as the current temperature to the vehicle control unit, and upload the latest detected allowable charge / discharge power as the first power to the vehicle control unit.

[0067] In step S2200, when the current temperature is less than or equal to the temperature threshold and the first power is less than or equal to the corresponding power threshold, the engine of the range-extended electric vehicle is controlled to work to heat the power battery.

[0068] In this embodiment, a first power threshold corresponding to the discharge state and a second power threshold corresponding to the charging state can be set in advance according to the application scenario or specific requirements. When the power battery is in a discharge state, the first power can be compared with the first power threshold; when the power battery is in a charging state, the first power can be compared with the second power threshold.

[0069] Furthermore, the range-extended electric vehicle's engine can be controlled to heat the power battery when the power battery is discharging, the current temperature is less than or equal to a temperature threshold, and the first power is less than or equal to a first power threshold. The range-extended electric vehicle's engine can also be controlled to heat the power battery when the power battery is charging, the current temperature is less than or equal to a temperature threshold, and the first power is less than or equal to a second power threshold.

[0070] In one embodiment of this disclosure, controlling the engine to operate in order to heat the power battery may include: controlling the engine to heat the water temperature circulation system; and controlling the water temperature circulation system to heat the power battery.

[0071] In one example, the engine can be controlled to heat the heat medium in the heat medium circuit of the water temperature circulation system; controlling the water temperature circulation system to heat the power battery can be achieved by controlling the opening state of the three-way valve of the water temperature circulation system, so that the heat medium heated by the engine in the heat medium circuit can exchange heat with the power battery, thereby heating the power battery.

[0072] In this embodiment, the heat generated by the engine during operation can be transferred to the power battery through the water temperature circulation system of the range-extended electric vehicle to heat the power battery.

[0073] In another embodiment of this disclosure, controlling the engine to heat the power battery may include: detecting the requested torque of the accelerator pedal of the range-extended electric vehicle; controlling the motor to output maximum torque when the requested torque is greater than the maximum torque that the generator can output; and using the engine to output the remaining torque, that is, the difference between the requested torque and the maximum torque that the motor can output, which is then output by the engine. When the requested torque is less than or equal to the maximum torque that the generator can output, directly controlling the generator to output the requested torque.

[0074] In this embodiment, when the current temperature is less than or equal to the temperature threshold and the first power is less than or equal to the corresponding power threshold, the torque output of the range-extended electric vehicle is mainly driven by the generator, which enables the power battery to discharge with a large current, allowing the power battery to increase its temperature through internal resistance heating.

[0075] If the current temperature is less than or equal to the temperature threshold and the first power is less than or equal to the corresponding power threshold, it means that the power battery's allowable charging and discharging power is limited due to the low temperature. Therefore, the engine of the range-extended electric vehicle can be controlled to heat the power battery.

[0076] If the current temperature is less than or equal to the temperature threshold and the first power is greater than the corresponding power threshold, it means that the low temperature does not affect the allowable charge and discharge power of the power battery. Therefore, it is not necessary to heat the power battery.

[0077] When the current temperature is greater than the temperature threshold, regardless of whether the first power is less than or equal to the corresponding power threshold, or greater than the corresponding power threshold, it means that the first power of the power battery is independent of the temperature, and there is no need to heat the power battery.

[0078] The engine may or may not operate without heating the power battery; this is not a limitation.

[0079] According to the embodiments of this disclosure, when the power battery is in a charging and discharging state, if the current temperature of the power battery is detected to be less than or equal to a temperature threshold and the first power is less than or equal to the corresponding power threshold, the engine of the range-extended electric vehicle is controlled to work to heat the power battery. In this way, when the allowable charging and discharging power of the power battery is limited due to low temperature, the residual heat generated during the engine operation can be used to heat the power battery, so that the power battery can be heated up quickly, which can increase the battery life and improve the driving experience.

[0080] In one embodiment of this disclosure, the method may further include: controlling the engine to drive a generator to supply power to a drive motor, so that the drive motor outputs power to the wheel end based on the electrical energy provided by the engine.

[0081] In this embodiment, the engine drives a generator to produce electrical energy. This energy bypasses the power battery and directly powers the drive motor, enabling it to output power to the wheels. This avoids the energy loss caused by the conversion process through the power battery. Furthermore, by providing power to the entire vehicle via the engine, the limitation on vehicle power caused by the limited charge and discharge power of the power battery at low temperatures is mitigated.

[0082] In one embodiment of this disclosure, when the current temperature of the power battery is less than or equal to a temperature threshold and the first power is less than or equal to the corresponding power threshold, the method may further include: controlling the power battery to stop charging and discharging.

[0083] In this embodiment, charging and discharging are stopped when the power battery's allowable charging and discharging power is limited due to low temperature. This can optimize the problem of limited vehicle power caused by the limited allowable charging and discharging power of the power battery at low temperatures.

[0084] In another embodiment of this disclosure, when the current temperature of the power battery is less than or equal to a temperature threshold and the first power is less than or equal to a corresponding power threshold, the method may further include: obtaining the current SOC of the power battery; when the current SOC of the power battery is less than or equal to a set first target SOC and the current SOC is greater than or equal to a set second SOC, controlling the power battery to stop charging and discharging, and controlling the engine-driven generator to supply power to the drive motor; when the current SOC of the power battery is greater than the first target SOC, controlling the power battery to supply power to the drive motor, and controlling the engine-driven generator to supply power to the drive motor; when the current SOC of the power battery is less than the second target SOC, controlling the engine-driven generator to charge the power battery; wherein the first target SOC is greater than the second target SOC.

[0085] Understandably, when the current SOC of the power battery is less than or equal to the set first target SOC and greater than or equal to the set second SOC, the range-extended electric vehicle (REEV) operates in conventional fuel mode, driven solely by the engine. When the current SOC of the power battery is greater than the first target SOC, the REEV operates in hybrid drive mode, driven by both the engine and the power battery. When the current SOC of the power battery is less than the second target SOC, the REEV enters charging mode, where the engine charges the power battery. In charging mode, the REEV can continue to operate under engine power, or it can be parked.

[0086] In this embodiment, determining whether to charge or discharge the power battery based on its current SOC can prevent overcharging or over-discharging, thereby protecting the power battery and extending its service life.

[0087] In one embodiment of this disclosure, the method may further include steps S3100 to S3300 as shown below:

[0088] Step S3100: Determine the target output power of the engine.

[0089] In one embodiment of this disclosure, determining the target output power of the engine may include the following steps S3110 to S3130:

[0090] Step S3110: Determine the total power requirement of the range-extended electric vehicle.

[0091] Vehicle power requirement refers to the total power that the engine needs to provide in order to meet the driver's driving needs.

[0092] In one embodiment of this disclosure, determining the total power demand of a range-extended electric vehicle may include the following steps S3111 to S3112:

[0093] Step S3111: Determine the accessory power requirement of the range-extended electric vehicle, the wheel-end power requirement of the range-extended electric vehicle, and the second power of the power battery.

[0094] The accessory power requirement of a range-extended electric vehicle can be the power consumed by all the working accessories in the vehicle. These accessories can include electrical components other than the drive motor, such as the instrument panel, cigarette lighter, central control screen, and audio system.

[0095] In one example of this disclosure, the required power of the accessory can be calculated by summing the power of all electrical accessories and drive motors, then calculating the output power of the drive motor, and finally calculating the difference between the sum of the power and the output power of the drive motor as the required power of the accessory.

[0096] The total power of all electrical accessories and drive motors can be calculated from the voltage and current on the power supply bus, and the output power of the drive motor can be determined according to the following formula:

[0097]

[0098] Where P′ is the output power of the drive motor, Te is the torque of the drive motor, and n is the speed of the drive motor.

[0099] The wheel-end power demand of a range-extended electric vehicle can be obtained based on the current throttle signal.

[0100] In one embodiment of this disclosure, the first mapping data may be pre-established, reflecting the mapping relationship between the wheel-end power demand and the throttle signal.

[0101] In this embodiment, the first mapping data can be a first mapping function, a first lookup table, etc., and is not limited here.

[0102] For the first mapping function, the dependent variable is the wheel-end demand power and the independent variable is the throttle signal. Thus, by substituting the current throttle signal into the first mapping function, the wheel-end demand power corresponding to the current throttle signal can be obtained.

[0103] For the first lookup table, the wheel-end power demand value corresponding to the current throttle signal can be found in the first lookup table. If the current throttle signal cannot be found directly in the first lookup table, the two values ​​adjacent to the current throttle signal can be found, and the wheel-end power demand corresponding to the current throttle signal can be obtained by interpolation based on these two values ​​and the wheel-end power demand corresponding to these two values.

[0104] The second power of the power battery can be determined based on the current SOC of the power battery.

[0105] In one example, if the current SOC is greater than the first target SOC, the second power of the power battery can be determined as the first power value; if the current SOC is less than the second target SOC, the second power of the power battery can be determined as the second power value. The first and second power values ​​can be pre-set according to the application scenario or specific requirements.

[0106] In another example, if the current SOC is greater than the first target SOC, a first SOC difference between the current SOC and the first target SOC can be determined; if the current SOC is less than the second target SOC, a second SOC difference between the second target SOC and the current SOC can be determined; and the second power of the power battery can be determined based on the obtained SOC difference.

[0107] Specifically, it can be a second mapping data that reflects the mapping relationship between SOC difference and power, and a third mapping data that reflects the mapping relationship between SOC difference and power.

[0108] When the current SOC is greater than the first target SOC, the corresponding second power can be obtained based on the first SOC difference and the second mapping data. When the current SOC is less than the second target SOC, the corresponding second power can be obtained based on the second SOC difference and the third mapping data.

[0109] In this embodiment, the second mapping data can be a second mapping function or a second lookup table, etc., and is not limited here.

[0110] For the second mapping function, the dependent variable is power and the independent variable is the first SOC difference. Thus, by substituting the first SOC difference into the second mapping function, the power value corresponding to the first SOC difference can be obtained as the second power.

[0111] For the second lookup table, the power value corresponding to the first SOC difference can be found in the second lookup table and used as the second power. If the first SOC difference cannot be found directly in the second lookup table, two values ​​adjacent to the first SOC difference can be found, and based on these two values ​​and the power values ​​corresponding to these two values, an interpolation method can be used to obtain the power value corresponding to the first SOC difference and used as the second power.

[0112] In this embodiment, the third mapping data can be a third mapping function, a third lookup table, etc., and is not limited here.

[0113] For the third mapping function, the dependent variable is power and the independent variable is the second SOC difference. Thus, by substituting the second SOC difference into the third mapping function, the power value corresponding to the second SOC difference can be obtained, which is used as the second power.

[0114] For the third lookup table, the power value corresponding to the second SOC difference can be found in the third lookup table and used as the second power. If the second SOC difference cannot be found directly in the third lookup table, two values ​​adjacent to the second SOC difference can be found, and based on these two values ​​and the power values ​​corresponding to these two values, interpolation can be used to obtain the power value corresponding to the second SOC difference and used as the second power.

[0115] Step S3112: Based on the required power of the accessories, the required power of the wheel ends, and the target charging and discharging power, the required power of the whole vehicle is obtained.

[0116] When the current SOC is greater than the first target SOC, the required power of the vehicle can be obtained using the following formula:

[0117] P1 = P2 + P3 - P4

[0118] Wherein, P1 is the power required for the whole vehicle, P2 is the power required for accessories, P3 is the power required for the wheel end, and P4 is the second power.

[0119] When the current SOC is less than the second target SOC, the required power of the vehicle can be obtained using the following formula:

[0120] P1 = P2 + P3 + P4

[0121] Wherein, P1 is the power required for the whole vehicle, P2 is the power required for accessories, P3 is the power required for the wheel end, and P4 is the second power.

[0122] In one embodiment of this disclosure, the method may further include: obtaining the actual output power and actual power consumption of the range-extended electric vehicle; and obtaining the overall vehicle error power of the range-extended electric vehicle based on the actual output power and actual power consumption.

[0123] Based on this, the required power of the whole vehicle is determined according to the error power of the whole vehicle. Specifically, the required power of the whole vehicle can be obtained from the required power of the accessories, the required power of the wheel ends, the second power, and the error power of the whole vehicle.

[0124] In this embodiment, a state observer can be used to monitor the actual output power and actual power consumption of the vehicle, and the vehicle error power can be calculated based on the vehicle power balance. Specifically, the vehicle error power can be the difference between the actual output power and the actual power consumption.

[0125] Furthermore, the vehicle error power can be determined according to the fifth frequency, and the required vehicle power can be determined based on the latest obtained vehicle error power. The fifth frequency can be pre-set according to the application scenario or specific requirements.

[0126] The actual output power can include the output power of the engine and the output power of the power battery.

[0127] When the current SOC is greater than the first target SOC, the required power of the vehicle can be obtained using the following formula:

[0128] P1 = P2 + P3 - P4 - P5

[0129] Wherein, P1 is the required power of the whole vehicle, P2 is the required power of accessories, P3 is the required power of the wheel end, P4 is the second power, and P5 is the error power of the whole vehicle.

[0130] When the current SOC is less than the second target SOC, the required power of the vehicle can be obtained using the following formula:

[0131] P1 = P2 + P3 + P4 - P5

[0132] Wherein, P1 is the required power of the whole vehicle, P2 is the required power of accessories, P3 is the required power of the wheel end, P4 is the second power, and P5 is the error power of the whole vehicle.

[0133] Step S3120: If the total vehicle power requirement is less than or equal to the engine's maximum output power, determine that the target output power is equal to the total vehicle power requirement.

[0134] Step S3130: If the required power of the vehicle is greater than the maximum output power, determine that the target output power is equal to the maximum output power.

[0135] In this embodiment, the maximum output power of the engine can be predetermined based on the vehicle's driving characteristics, low temperature characteristics, NVH characteristics, mechanical characteristics, etc.

[0136] In this embodiment, when the total power demand of the vehicle is less than or equal to the maximum output power of the engine, it can be ensured that the power output of the engine can meet the power demand of the vehicle, the power demand of accessories, and the charging and discharging demand of the power battery.

[0137] When the power demand of the vehicle exceeds the maximum output power, setting the target output power equal to the maximum output power ensures that the actual output power of the engine does not exceed its maximum output power, thus protecting the engine from damage due to excessive output power.

[0138] When the power demand of the vehicle exceeds the maximum output power, priority can be given to ensuring the power demand of all working accessories in the vehicle and the charging and discharging demand of the power battery. That is, when the power demand of the vehicle reaches the maximum power that the engine can provide, no further increase in power demand will be responded to.

[0139] Step S3200: Determine the first target torque of the engine, the second target torque of the generator, and the third target torque of the drive motor based on the target output power.

[0140] In this embodiment, the vehicle control unit may determine the corresponding engine output torque, generator output torque, and drive motor output torque based on the target output power, and use them as the first target torque, the second target torque, and the third target torque, respectively.

[0141] In one embodiment of this disclosure, it may be a fourth mapping data that is pre-established to reflect the mapping relationship between the generator output power and the engine output torque.

[0142] In this embodiment, the fourth mapping data can be a fourth mapping function, a fourth lookup table, etc., and is not limited here.

[0143] For the fourth mapping function, the dependent variable is the engine output torque and the independent variable is the generator output power. Thus, by substituting the target output power into the fourth mapping function, the engine output torque corresponding to the target output power can be obtained, which can be used as the first target torque.

[0144] For the fourth lookup table, the engine output torque corresponding to the target output power can be found in the fourth lookup table and used as the first target torque. If the target output power cannot be found directly in the fourth lookup table, two values ​​adjacent to the target output power can be found, and based on these two values ​​and the engine output torques corresponding to these two values, an interpolation method can be used to obtain the engine output torque corresponding to the target output power, which can be used as the first target torque.

[0145] In one embodiment of this disclosure, it may be a fifth mapping data that is pre-established to reflect the mapping relationship between the generator output power and the generator output torque.

[0146] In this embodiment, the fifth mapping data can be a fifth mapping function, a fifth lookup table, etc., and is not limited here.

[0147] For the fifth mapping function, the dependent variable is the generator output torque and the independent variable is the generator output power. Thus, by substituting the target output power into the fifth mapping function, the generator output torque corresponding to the target output power can be obtained, which can be used as the second target torque.

[0148] For the fifth lookup table, the generator output torque corresponding to the target output power can be found in the fifth lookup table and used as the second target torque. If the target output power cannot be found directly in the fifth lookup table, two values ​​adjacent to the target output power can be found, and the generator output torque corresponding to the target output power can be obtained by interpolation based on these two values ​​and the generator output torques corresponding to these two values, and used as the second target torque.

[0149] In one embodiment of this disclosure, a sixth mapping data may be pre-established, reflecting the mapping relationship between the generator output power and the drive motor output torque.

[0150] In this embodiment, the sixth mapping data can be a sixth mapping function, a sixth lookup table, etc., and is not limited here.

[0151] For the sixth mapping function, the dependent variable is the output torque of the drive motor and the independent variable is the output power of the generator. Thus, by substituting the target output power into the sixth mapping function, the output torque of the drive motor corresponding to the target output power can be obtained, which can be used as the third target torque.

[0152] For the sixth lookup table, the drive motor output torque corresponding to the target output power can be found in the sixth lookup table and used as the third target torque. If the target output power cannot be found directly in the sixth lookup table, two values ​​adjacent to the target output power can be found, and the drive motor output torque corresponding to the target output power can be obtained by interpolation based on these two values ​​and the drive motor output torques corresponding to these two values, and used as the third target torque.

[0153] Step S3300: Control the output torque of the engine according to the first target torque, output the output torque of the generator according to the second target torque, and control the output torque of the drive motor according to the third target torque.

[0154] In this embodiment, controlling the engine's output torque according to the first target torque can make the engine's output torque approximately equal to the first target torque; outputting the generator's output torque according to the second target torque can make the generator's output torque approximately equal to the second target torque; and controlling the drive motor's output torque according to the third target torque can make the drive motor's output torque approximately equal to the third target torque.

[0155] When the engine output torque is controlled according to the first target torque, the engine output power is the target output power.

[0156] When the generator outputs its output torque according to the second target torque, the generator's output power is the sum of the vehicle's accessory power requirement, wheel-end power requirement, and vehicle error power, plus the allowable charging power of the power battery or minus the allowable discharging power of the power battery.

[0157] When the output torque of the drive motor is controlled according to the third target torque, the output power of the drive motor is the power required by the wheel end.

[0158] In this embodiment, when the vehicle control unit receives the first target torque, the second target torque, and the third target torque, it may send the first target torque to the engine management system, the second target torque to the generator controller, and the third target torque to the drive motor controller. This allows the engine management system to control the engine output torque based on the first target torque, the generator controller to output the generator output torque based on the second target torque, and the drive motor controller to control the drive motor output torque based on the third target torque.

[0159] This embodiment enables precise control of the engine, generator, and drive motor, allowing the vehicle to operate normally even when the power battery is in a low-temperature, low-power state.

[0160] <Vehicles>

[0161] This disclosure also provides a range-extended electric vehicle, such as Figure 3 As shown, the range-extended electric vehicle 3000 may include a processor 3100 and a memory 3200, the memory 3200 being used to store a computer program for controlling the processor 3100 to perform the methods described in any embodiment of this disclosure.

[0162] Computer-readable storage media

[0163] This disclosure also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the methods described in any embodiment of this disclosure.

[0164] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0165] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination thereof. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0166] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0167] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0168] Various aspects of this disclosure are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0169] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0170] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0171] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions. It will be known to those skilled in the art that implementation in hardware, implementation in software, and implementation in a combination of software and hardware are equivalent.

[0172] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. A control method for a range-extended electric vehicle, characterized in that, include: When the power battery of the range-extended electric vehicle is in a charging and discharging state, the current temperature and first power of the power battery are detected. When the current temperature is less than or equal to a temperature threshold and the first power is less than or equal to the corresponding power threshold, the engine is controlled to operate to heat the power battery; the engine is controlled to drive the generator to supply power to the drive motor so that the drive motor outputs power to the wheel end of the range-extended electric vehicle; and the power battery is controlled to stop charging and discharging.

2. The method according to claim 1, characterized in that, The control of the engine to heat the power battery includes: The engine is controlled to heat the water temperature circulation system; The water temperature circulation system is used to heat the power battery.

3. The method according to claim 1, characterized in that, When the current temperature is less than or equal to a temperature threshold and the first power is less than or equal to the corresponding power threshold, the method further includes: Obtain the current SOC of the power battery; When the current SOC is less than or equal to a set first target SOC and the current SOC is greater than or equal to a set second target SOC, the power battery is controlled to stop charging and discharging, and the engine-driven generator is controlled to supply power to the drive motor; wherein the first target SOC is greater than the second target SOC; If the current SOC is greater than the first target SOC, the power battery is controlled to supply power to the drive motor, and the engine is controlled to drive the generator to supply power to the drive motor. If the current SOC is less than the second target SOC, the engine is controlled to drive the generator to charge the power battery.

4. The method according to claim 3, characterized in that, The method further includes: Determine the target output power of the engine; The first target torque of the engine, the second target torque of the generator, and the third target torque of the drive motor are determined based on the target output power. The output torque of the engine is controlled according to the first target torque, the output torque of the generator is controlled according to the second target torque, and the output torque of the drive motor is controlled according to the third target torque.

5. The method according to claim 4, characterized in that, Determining the target output power of the engine includes: Determine the total power requirement of the range-extended electric vehicle; If the required power of the vehicle is less than or equal to the maximum output power of the engine, the target output power is determined to be equal to the required power of the vehicle. If the required power of the vehicle is greater than the maximum output power, the target output power is determined to be equal to the maximum output power.

6. The method according to claim 5, characterized in that, Determining the total power requirement of the range-extended electric vehicle includes: Determine the accessory power requirement of the range-extended electric vehicle, the wheel-end power requirement of the range-extended electric vehicle, and the second power of the power battery; The required power of the whole vehicle is obtained based on the required power of the accessories, the required power of the wheel ends, and the second power.

7. The method according to claim 6, characterized in that, The method further includes: Obtain the actual output power and actual power consumption of the range-extended electric vehicle; Based on the actual output power and the actual power consumption, the total vehicle error power of the range-extended electric vehicle is obtained, and the total vehicle demand power is determined based on the total vehicle error power.

8. A range-extended electric vehicle, characterized in that, It includes a processor and a memory, the memory being used to store a computer program, the computer program being used to control the processor to perform the method as described in any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by a processor, implements the method as described in any one of claims 1 to 7.

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