Method and system for controlling range extender, medium and product

Abstract

The invention provides a method and system for controlling a range extender, a medium and a product, and relates to the technical field of range extenders, the method is applied to a range-extended hybrid vehicle with the range extender, and the method comprises the steps that after a power clearing instruction of the range extender is received, the target torque of an engine is set to be zero; performing unauthorized control on the generator, setting the control mode of the generator as a rotating speed control mode, and dynamically adjusting the target rotating speed of the generator based on the bus electric signal of the output end of the generator controller in the rotating speed control mode; and in the process of implementing the unauthorized control, when the bus electric signal and the actual rotating speed of the engine meet a preset power clearing ending condition, the unauthorized control is ended, and the control mode of the generator controller is set to be an uncontrolled mode, so that the actual rotating speed of the engine is reduced to idle speed. According to the method, the control mode of the generator is adjusted according to the power clearing instruction, the target rotating speed of the generator is dynamically adjusted, and rapid power clearing of the range extender can be achieved.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of range extenders, and particularly relates to a method, system, medium and product for controlling a range extender. BACKGROUND

[0002] In a range-extended hybrid vehicle, the range extender generally includes an engine and a generator, and can also include a shaft coupling. The driving and braking functions of the vehicle are both completed by the drive motor. In the driving process, the required electric energy of the drive motor is provided by the range extender or the power battery. In the braking stage, the drive motor generates negative torque, and the drive motor controller generates negative current to charge the power battery.

[0003] In the power generation process of the range extender, when there is a high-power braking recovery demand, in order to avoid the sum of the braking feedback electric power and the power generation power exceeding the charging limit of the power battery, it is necessary to quickly reduce the power generation power of the range extender to zero to ensure that the power battery has more sufficient energy recovery space, thereby improving the energy efficiency of the vehicle, reducing the wear degree of the vehicle braking system, and prolonging the service life of the power battery.

[0004] The related art does not have a control strategy that can quickly remove the power generation power of the range extender, which leads to the fact that the energy recovery demand of the power battery cannot be fully met when there is a high-power braking recovery demand, thereby affecting the economy and braking performance of the vehicle. SUMMARY

[0005] The present disclosure provides a method, system, medium and product for controlling a range extender, which aims to at least partially solve the technical problem of poor energy recovery effect of the power battery due to the inability to quickly clear the power of the range extender in the related art.

[0006] At least one embodiment of the present disclosure provides a method for controlling a range extender, applied to a range-extended hybrid vehicle having a range extender, the range extender including an engine, a generator and a generator controller, the method comprising:

[0007] After receiving the power clearing instruction of the range extender, setting the control mode of the engine to a torque control mode and setting the target torque of the engine to zero;

[0008] Implementing an over-ride control on the generator, the over-ride control being configured to set the control mode of the generator to a speed control mode, and dynamically adjusting the target speed of the generator based on the bus electric signal at the output end of the generator controller in the speed control mode, so as to clear the power of the range extender by increasing the target speed of the generator; and

[0009] In the process of implementing the over-ride control, the bus electrical signal and the actual speed of the engine are monitored, and when the bus electrical signal and the actual speed of the engine meet a pre-set clear power end condition, the over-ride control is ended, the control mode of the generator controller is set to a non-control mode, and the actual speed of the engine is reduced to an idle speed.

[0010] In the method provided in at least one embodiment of the present disclosure, the extended-range hybrid vehicle includes a power battery coupled with the generator controller, and the method further includes:

[0011] In the process of implementing the over-ride control, the bus electrical signal and the actual speed of the engine are monitored, and when the bus electrical signal and the actual speed of the engine meet a pre-set clear power end condition, the over-ride control is ended, the control mode of the generator controller is set to a non-control mode, and the actual speed of the engine is reduced to an idle speed.

[0012] In the process of implementing the over-ride control, the bus electrical signal and the actual speed of the engine are monitored, and when the bus electrical signal and the actual speed of the engine meet a pre-set clear power end condition, the over-ride control is ended, the control mode of the generator controller is set to a non-control mode, and the actual speed of the engine is reduced to an idle speed.

[0013] In the process of implementing the over-ride control, the bus electrical signal and the actual speed of the engine are monitored, and when the bus electrical signal and the actual speed of the engine meet a pre-set clear power end condition, the over-ride control is ended, the control mode of the generator controller is set to a non-control mode, and the actual speed of the engine is reduced to an idle speed.

[0014] The method provided in at least one embodiment of the present disclosure further includes:

[0015] In the process of implementing the over-ride control, the bus electrical signal and the actual speed of the engine are monitored, and when the bus electrical signal and the actual speed of the engine meet a pre-set clear power end condition, the over-ride control is ended, the control mode of the generator controller is set to a non-control mode, and the actual speed of the engine is reduced to an idle speed.

[0016] In response to the signal value of the bus electrical signal being a negative value, second information is outputted for representing that the range extender is in a power generation state, and the target speed of the generator is controlled to increase; and,

[0017] In response to the signal value of the bus electrical signal being converted from a negative value to a positive value, third information is outputted for representing that the range extender has cleared its power generation.

[0018] In the method provided in at least one embodiment of the present disclosure, the bus electrical signal is a bus current, and the clear power end condition includes:

[0019] The signal value of the bus electrical signal is greater than or equal to a first set value, where the first set value is used to represent that the generator does not generate power;

[0020] The actual torque of the engine is less than a second set value, where the second set value is used to represent that the engine stops outputting power; and,

[0021] The signal value of the bus electrical signal is greater than or equal to a first set value and the actual torque of the engine is less than a second set value, and the timing time when both conditions are met exceeds a set time, where the set time is used to exclude that the bus current signal is mutated.

[0022] In the method provided by at least one embodiment of the present disclosure, the over-ride control comprises:

[0023] switching the control mode of the engine from a current mode to a speed control mode, wherein the speed control mode is different from the current mode, and the speed control mode is provided with a plurality of control periods;

[0024] obtaining the busbar electric signal, generating a target speed of a first control period of the plurality of control periods based on the busbar electric signal, so as to control the operation of the generator in the first control period;

[0025] in each current control period after the first control period, obtaining an actual speed of the engine and an actual speed of the generator, and generating an ascending slope of the target speed based on a speed deviation between the actual speed of the engine and the actual speed of the generator; and

[0026] generating the target speed of the current control period based on the target speed of a previous control period of the current control period and the ascending slope, so as to control the operation of the generator in the current control period.

[0027] In the method provided by at least one embodiment of the present disclosure, the over-ride control further comprises:

[0028] monitoring a speed deviation between the actual speed of the engine and the actual speed of the generator; and

[0029] when the speed deviation continuously increases and the speed deviation at a current time is greater than a pre-set speed deviation threshold, correcting the ascending slope based on the speed deviation at the current time, so that the ascending slope is reduced.

[0030] In the method provided by at least one embodiment of the present disclosure, the first set value is greater than or equal to zero; and

[0031] the second set value is set in relation to the maximum net torque of the engine, and the second set value is less than a set percentage of the maximum net torque of the engine;

[0032] the set time is set in relation to a signal transmission period of the busbar electric signal, and the set time is greater than one signal transmission period.

[0033] In the method provided by at least one embodiment of the present disclosure, the method further comprises:

[0034] After ending the over-ride control, in response to receiving the power generation instruction of the range extender, setting the control mode of the engine to a speed control mode, and setting the control mode of the generator to a torque control mode;

[0035] obtaining a power generation demand of the range extender hybrid vehicle; and

[0036] setting a target torque of the generator in the torque control mode based on the power generation demand of the range extender hybrid vehicle.

[0037] At least one embodiment of the present disclosure further provides a system for controlling a range extender, applied to a range extender hybrid vehicle having a range extender, the range extender including an engine, a generator and a generator controller, the system including:

[0038] a pre-processing unit configured to, after receiving a power cleaning instruction of the range extender, set the control mode of the engine to a torque control mode, and set a target torque of the engine to zero;

[0039] a first control unit configured to implement an over-ride control on the generator, the over-ride control being configured to set the control mode of the generator to a speed control mode, and dynamically adjust a target speed of the generator based on a bus voltage signal at an output end of the generator controller in the speed control mode, so as to clean power of the range extender by increasing the target speed of the generator; and

[0040] a second control unit configured to, during implementation of the over-ride control, monitor the bus voltage signal and an actual speed of the engine, and when the bus voltage signal and the actual speed of the engine satisfy a pre-set power cleaning end condition, end the over-ride control, set the control mode of the generator controller to a non-control mode, so as to reduce the actual speed of the engine to an idle speed.

[0041] At least one embodiment of the present disclosure further provides a storage medium, the storage medium storing a program or instructions, the program or instructions being executed by a processor to implement steps of the method provided by any one of the embodiments of the present disclosure.

[0042] At least one embodiment of the present disclosure further provides a product including a program or instructions, wherein the program or instructions are executed by a processor to implement steps of the method provided by any one of the embodiments of the present disclosure.

[0043] The method, system, medium and product for controlling the range extender provided by the embodiments of the present disclosure can determine the timing of the range extender demand clean power according to the clean power instruction, adjust the control mode of the generator, and adjust the target speed of the generator based on the bus signal at the output end of the generator controller, so as to realize the fast clean power of the range extender, and significantly improve the power management efficiency of the range extender of the range-extending hybrid vehicle. Through intelligent and automatic control means, the method can quickly respond to various working condition requirements, effectively avoid safety hazards caused by sudden changes in power output, optimize the overall performance of the range-extending hybrid vehicle, ensure that the power battery has more sufficient energy recovery space, reduce the wear and tear of the vehicle braking system, and prolong the service life of the power battery. Therefore, the method has important significance for promoting the development and progress of range-extending hybrid vehicle technology, and solves the technical problem of poor power battery energy recovery effect caused by the inability of the related art to quickly clean the power of the range extender.

[0044] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0046] Figure 1 A flowchart of a method for controlling a range extender provided by at least one embodiment of the present disclosure;

[0047] Figure 2 A schematic diagram of a hybrid power system of a range-extending hybrid vehicle provided by at least one embodiment of the present disclosure;

[0048] Figure 3 A flowchart of another method for controlling a range extender provided by at least one embodiment of the present disclosure;

[0049] Figure 4 A flowchart of another method for controlling a range extender provided by at least one embodiment of the present disclosure;

[0050] Figure 5 A flowchart of an example of a method for controlling a range extender provided by at least one embodiment of the present disclosure;

[0051] Figure 6 A structural block diagram of a system for controlling a range extender provided by at least one embodiment of the present disclosure;

[0052] Figure 7 A schematic diagram of a program product according to an embodiment of the present disclosure.

[0053] Reference Signs:

[0054] 1 - engine; 2 - coupling; 3 - generator; 4 - generator controller; 5 - power battery; 6 - drive motor; 7 - drive motor controller; 8 - bus of output terminal of generator controller; 10 - system for controlling range extender; 11 - pre-processing unit; 12 - first control unit; 13 - second control unit; 21 - processor; 22 - memory; 23 - input device;

[0055] 24 - output device. DETAILED DESCRIPTION

[0056] The present disclosure will be further described by way of illustration with reference to the following drawings and embodiments. It is specifically pointed out that the following embodiments are merely for illustrative purposes and do not limit the scope of the present disclosure. Similarly, the following embodiments are only part of the embodiments of the present disclosure, and all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present disclosure.

[0057] The terms "first", "second", and "third" in the embodiments of the present disclosure are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", and "third" can explicitly or implicitly include at least one of the features.

[0058] In the description of the present disclosure, the meaning of "a plurality of" is at least two, such as two or three, etc., unless otherwise explicitly and specifically limited.

[0059] In the present disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0060] The terms "comprise", "comprising", "have", "having", "include", "including" and "contain", "containing", or any other variation thereof, used in the embodiments of the present disclosure, cover a non-exclusive inclusion. For example, a process, method, system, product or device that comprises a list of steps or units is not limited to the listed steps or units, but can optionally further include other steps or units not listed, or can optionally further include other steps or components inherent to such processes, methods, products or devices.

[0061] As used herein, "program product" is a software product that implements its solution primarily through computer programs, not limited to running on a certain type of electronic device or electronic device.

[0062] As used herein, "electronic device" includes, but is not limited to, devices configured to receive / send communication signals via wired lines (such as via public switched telephone network (PSTN), digital driver line (DSL), digital cable or direct cable connection, and / or another data connection / network) and / or via wireless interface (for example, for cellular network, wireless local area network (WLAN), digital television network such as DVB-H network, satellite network or AM-FM broadcast transmitter, and / or another communication terminal). The communication terminal configured to communicate through the wireless interface can be referred to as "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communication system (PCS) terminals that can combine cellular wireless telephones with data processing, fax, and data communication capabilities; PDAs that can include wireless telephones, pagers, Internet / intranet access, Web browser, notepad, calendar, and / or global positioning system (GPS) receiver; and conventional laptop and / or palm-top receivers or other electronic devices including wireless telephone transceivers.

[0063] The term "engine controller" in the embodiments of the present disclosure, abbreviated as ECU, is used to control the operation of the engine.

[0064] The term "generator controller" in the embodiments of the present disclosure, abbreviated as GCU, is used to control the operation of the generator.

[0065] The term "range extender controller" in the embodiments of the present disclosure, abbreviated as RCU, coordinates the work of GCU and ECU, and monitors the relevant states of GCU and ECU.

[0066] The term "vehicle control unit" in the embodiments of the present disclosure, abbreviated as VCU, coordinates the high-voltage electricity on the battery control system of the range extender hybrid vehicle, and coordinates the power generation of the range extender system.

[0067] The term "range extender" in the embodiments of the present disclosure includes the engine, the generator and the generator controller, and can also include the shaft coupling.

[0068] The term "busbar" in the embodiments of the present disclosure refers to an important component for connecting high-voltage electrical equipment and transmitting high-voltage electrical energy in a range-extending hybrid vehicle. The busbar usually has high electrical conductivity and mechanical strength, which can ensure the stability and reliability of power transmission.

[0069] The term "idling speed" in the embodiments of the present disclosure refers to the lowest speed state of the engine under no load.

[0070] Figure 1 A flowchart of a method for controlling a range extender is provided for at least one embodiment of the present disclosure. The method is applied to a range-extending hybrid vehicle having a range extender, and the range extender includes an engine, a generator, and a generator controller. As shown in Figure 1 The method can include the following steps S10-S30.

[0071] Step S10: After receiving the power cleaning instruction of the range extender, set the control mode of the engine to the torque control mode, and set the target torque of the engine to zero.

[0072] Step S20: Implement override control on the generator, wherein the override control is configured to set the control mode of the generator to the speed control mode, and dynamically adjust the target speed of the generator based on the busbar electrical signal (also referred to as the generator signal) at the output end of the generator controller in the speed control mode, so as to clean the power of the range extender by increasing the target speed of the generator.

[0073] Step S30: During the implementation of the override control, monitor the busbar electrical signal and the actual speed of the engine, and when the busbar electrical signal and the actual speed of the engine meet the pre-set power cleaning end condition, end the override control, set the control mode of the generator controller to the non-control mode, so as to reduce the actual speed of the engine to the idling speed.

[0074] It should be noted that steps S10-S30 are used to control the range extender to clean the power quickly. The method can be applied to the vehicle controller VCU or the range control unit RCU of the range-extending hybrid vehicle, and the embodiments of the present disclosure do not limit this. The busbar position at the output end of the generator controller is as shown in Figure 2

[0075] Some embodiments of the present disclosure also provide a system, a medium (storage medium), and a product (program product) corresponding to the above-mentioned method.

[0076] ​The method provided by at least one embodiment of the present disclosure is suitable for any existing scenario requiring quick power clearing of the range extender of the range-extended hybrid vehicle. For example, when the range-extended hybrid vehicle needs to immediately reduce power output due to emergency braking or sudden failure, the method can quickly respond to achieve quick power clearing of the range extender by adjusting the control mode and target parameters of the engine and generator, thereby ensuring safe and smooth operation of the vehicle. In addition, the method can also be applied to simulate the performance of the range extender in different working states during vehicle maintenance or testing, and meet diversified testing requirements by flexibly adjusting the control strategy, thereby significantly improving the safety and reliability of the range-extended hybrid vehicle and providing strong support for performance optimization and maintenance testing of the vehicle.

[0077] Compared with the related art, the method provided by the present disclosure can determine the timing of the range extender demand power clearing according to the power clearing instruction, adjust the control mode of the generator, and adjust the target speed of the generator based on the bus electrical signal at the output end of the generator controller, thereby achieving quick power clearing of the range extender and significantly improving the power management efficiency of the range extender of the range-extended hybrid vehicle. Through intelligent and automatic control means, the method can quickly respond to various working condition requirements, effectively avoid safety hazards caused by sudden changes in power output, optimize the overall performance of the range-extended hybrid vehicle, ensure that the power battery has more sufficient energy recovery space, reduce the wear degree of the vehicle braking system, and prolong the service life of the power battery. Therefore, the method has important significance for promoting the development and progress of range-extended hybrid vehicle technology, and solves the technical problem of poor energy recovery effect of the power battery caused by the inability of the related art to quickly clear the power of the range extender.

[0078] For step S10, the power clearing instruction of the range extender indicates that the range-extended hybrid vehicle has a quick power clearing demand of the range extender. When the vehicle controller identifies the quick power clearing demand of the range extender, the power clearing instruction of the range extender is generated. Under the power clearing instruction, the target torque of the engine is set to zero, so that the engine stops outputting power.

[0079] For step S20, under the power clearing instruction, the target torque of the engine is set to zero, and the target speed of the over-ride control generator is also set. The over-ride control aims to switch the control mode from the current mode which is not a speed control mode to a speed control mode, and dynamically adjust the target speed of the generator, so that the range extender can quickly clear power.

[0080] For step S30, when the bus electrical signal and the actual speed of the engine meet the power clearing end condition, the target speed of the generator is no longer over-ride, the control mode of the generator controller is switched from the current control mode to a non-control mode, and the actual speed of the engine freely falls to idle speed, and the power clearing is completed.

[0081] In order to better understand the over-control, an example of over-control in the process of clearing power is listed below for illustration. In the example, when the extended-range hybrid vehicle is running, the power generation demand of the vehicle controller is 100 kW, at this time the control mode of the engine is the speed control mode, the target speed is 1200 rpm, and the control mode of the generator is the torque control mode, and the target torque is 800 N·m. When there is a braking condition, the power generation demand of the vehicle controller immediately changes to 0 kW, at this time the control mode of the engine is switched to the torque control mode, and the target torque is 0 N·m. The control mode of the generator is switched to the speed control mode, and the target speed of the generator is no longer equal to the target speed corresponding to the power generation demand of 0 in the vehicle controller. The target speed corresponding to 0 power is generally higher than the idle speed of the engine, for example, the idle speed of the engine is 700 rpm, and the target speed corresponding to 0 power is 800 rpm. After the method of the embodiment of the present disclosure is adopted, the target speed of the generator at this time is equal to the target speed obtained based on the bus current value at the output end of the generator controller in step S20, that is, the over-control target speed of the generator.

[0082] Figure 2 A schematic diagram of a hybrid power system of an extended-range hybrid vehicle is provided for at least one embodiment of the present disclosure. As shown in Figure 2 , the engine 1, the shaft coupling 2, the generator 3 and the generator controller 4 together constitute an extender. The bus 8 at the output end of the generator controller is located on the connection line between the generator output end and the controller. In the extended-range hybrid system, the vehicle driving and braking are all completed by the drive motor 6. When driving, the extender or the power battery 5 can provide electric energy, and when braking, the drive motor 6 generates negative torque, and the drive motor controller 7 generates negative current to feed the electric energy back to the power battery 5. When the charging power of the power battery 5 is limited, the generator power of the extender needs to be immediately cleared to prevent the sum of the braking feedback electric power and the generator power from exceeding the charging limit allowed by the power battery 5.

[0083] Figure 3 A flowchart of another method for controlling the extender is provided for at least one embodiment of the present disclosure. As shown in Figure 3 , based on Figure 1 , in order to optimize the energy management of the extended-range hybrid vehicle in the process of clearing power, the method can further include the following steps S01-S03.

[0084] Step S01: obtaining vehicle data during the power generation of the extender.

[0085] Step S02: obtaining the charging power of the power battery and the power generation demand of the extended-range hybrid vehicle based on the vehicle data.

[0086] Step S03: When the charging power of the power battery is triggered by power limitation or the power generation demand power of the range extended vehicle is reduced to zero, output the first information for representing the range extender entering the clean power operation process, and generate the clean power instruction of the range extender.

[0087] Wherein, through steps S01-S03, the energy management of the range extended vehicle can be further optimized, ensuring that the state of charge of the power battery is effectively managed during the power generation process of the range extender, while avoiding the range extender working continuously in unnecessary situations. This improvement not only improves energy utilization efficiency, but also effectively prolongs the service life of key components of the range extended vehicle. When the charging power of the power battery is triggered by power limitation or the power generation demand power of the range extended vehicle is reduced to zero, the system can quickly respond by outputting the first information to indicate the range extender entering the clean power operation process, and automatically generating the corresponding clean power instruction. This process realizes precise control of the range extender working, avoids energy waste and component wear, and provides a more reliable and efficient travel experience for the driver.

[0088] Figure 4 Another flowchart of a method for controlling the range extender is provided for at least one embodiment of the present disclosure. As shown in Figure 4 , on the basis of Figure 1 , in order to intuitively display the progress of the clean power operation process and ensure the effectiveness of the clean power operation process, the method further includes steps S40-S60.

[0089] Step S40: In the process of implementing the override control, the busbar electrical signal at the output end of the generator controller is monitored.

[0090] Step S50: In response to the signal value of the busbar electrical signal being negative, the second information for representing the range extender being in the power generation state is sent out, and the target speed of the generator is controlled to increase.

[0091] Step S60: In response to the signal value of the busbar electrical signal being converted from negative to positive, the third information for representing that the range extender has cleaned its power generation power is sent out.

[0092] The bus electrical signal can be current or voltage. When the signal value of the bus electrical signal is negative, it represents that the range extender is still generating electricity. When the signal value of the bus electrical signal is positive, it represents that the range extender is consuming electricity. Through steps S40-S60, real-time monitoring and response of the bus electrical signal are realized, ensuring the stability and safety of the range extender during the power clearing operation. When the bus electrical signal is abnormal, i.e., the signal value is negative, the system can quickly identify and adjust, and maintain the stability of the power generation state by increasing the target speed of the generator. When the bus electrical signal returns to normal, i.e., the signal value changes from negative to positive, the system can accurately determine that the range extender has completed the removal of the generated power, and issue a corresponding third information for the next operation. The design of this series of steps not only improves the working efficiency of the range extender, but also enhances the reliability and safety of the entire system, providing a strong guarantee for the driving experience of the driver.

[0093] In some embodiments, the bus electrical signal is selected as the bus current (also referred to as the generated current). The bus current is an important parameter reflecting the state of the range extender power clearing, and its real-time monitoring and accurate control are crucial to improving the overall performance of the system. By setting the bus electrical signal as the bus current, the system can more directly obtain the current change of the range extender during the power clearing operation. This setting improves the response speed of the system to the working state of the range extender. When the bus current is negative, the system can quickly identify that the range extender is in the power generation state, and take corresponding measures to adjust the target speed of the generator to maintain stable power generation of the system. When the bus current changes from negative to positive, the system can accurately determine that the range extender has completed the removal of the generated power, and issue a third information for the next operation. This series of control strategies based on the bus current not only further optimizes the working efficiency of the range extender, but also improves the reliability and safety of the entire system.

[0094] As an exemplary embodiment, when there is a power clearing demand, the bus current value at the output end of the generator controller is -300A, and the actual speed of the generator is 1300 revolutions, indicating that the current range extender is still generating electricity at a large current. According to the current adjustment of the target speed of the generator, the target speed of the generator obtained by PID control is 1600 revolutions, and the generator controller will immediately adjust the bus current for speed increase. The bus current at the output end of the generator controller quickly changes from negative to positive. When the bus current becomes positive, it represents that the range extender has removed the generated power. In this example, by increasing the target speed of the generator, the bus current at the output end of the generator controller is quickly changed from negative to positive, achieving the goal of rapid power clearing.

[0095] In some embodiments, to accurately determine that the range extender has completed the power clearing operation process, the power clearing end condition in step S30 is configured as: the signal value of the bus electrical signal is greater than or equal to a first set value, the actual torque of the engine is less than a second set value, and the signal value of the bus electrical signal is greater than or equal to the first set value and the actual torque of the engine is less than the second set value simultaneously for a timing time exceeding a set time. The first set value is used to represent that the generator does not generate electricity. The second set value is used to represent that the engine stops outputting power. The set time is used to exclude the mutation of the bus current signal, and the set time is a time threshold value for excluding the mutation of the bus current signal. Through the double monitoring of the bus electrical signal and the actual torque of the engine, it can be more accurately determined whether the range extender has completed the power clearing operation process. When the signal value of the bus electrical signal reaches or exceeds the first set value, it indicates that the output current of the range extender has been reduced to a certain extent, indicating the preliminary completion of power clearing. When the actual torque of the engine is less than the second set value, it further confirms the reduction of the engine load, which usually means that the range extender has gradually stopped providing additional power output. Only when these two conditions are met simultaneously and the duration exceeds the pre-set set time, the system will finally determine that the power clearing operation process is completed. Such a determination logic effectively avoids false judgments caused by transient fluctuations or disturbances, ensuring the accuracy and reliability of the control strategy. Moreover, through such design, the system can more finely manage the working state of the range extender, further improving the performance and stability of the overall system.

[0096] As a preferred embodiment, the first setting value is greater than or equal to zero, the second setting value is set in relation to the maximum net torque of the engine, and the second setting value is less than a set percentage of the maximum net torque of the engine, and the setting time is set in relation to the signal transmission period of the bus electric signal, and the setting time is greater than one signal transmission period. For example, the first setting value can be set to 0 or a value close to 0 to quickly clear the bus current to 0 to meet the requirement of fast power clearing. Moreover, the maximum net torque of the engine is 1000 N·m, and the second setting value can be 10% of the maximum net torque, representing that the actual torque of the engine has been substantially cleared. In addition, the signal transmission period of the bus current is 20 ms, and the delay is 5 periods, i.e., the setting time is set to 100 ms. Through such specific numerical setting, the system can flexibly adjust the threshold and determination time of the power clearing operation according to the actual requirement under different working conditions. When the first setting value is close to 0, the system can respond quickly and cut off the bus current in time to avoid unnecessary energy loss. At the same time, the second setting value is set to 10% of the maximum net torque of the engine, which not only ensures a significant reduction in engine load, but also avoids the damage that excessive reduction of torque may cause to the engine. In addition, the setting time matches the signal transmission period of the bus electric signal, ensuring the accuracy and timeliness of the determination logic. Such design not only improves the efficiency of the power clearing operation, but also enhances the stability and reliability of the system, providing strong support for the intelligent control of the range extender.

[0097] In some embodiments, in order to speed up the power clearing operation process, the over-riding control in step S20 is refined to include the following sub-steps S201-S204.

[0098] Sub-step S201: Switching the control mode of the engine from the current mode to a speed control mode, wherein the speed control mode is different from the current mode, and the speed control mode is provided with a plurality of control periods.

[0099] Sub-step S202: Obtaining the bus electric signal, generating a target speed in the first control period of the plurality of control periods based on the bus electric signal, to control the operation of the generator in the first control period.

[0100] Sub-step S203: In each current control period after the first control period, obtaining the actual speed of the engine and the actual speed of the generator, and generating an ascending slope of the target speed based on the speed deviation between the actual speed of the engine and the actual speed of the generator.

[0101] Sub-step S204: Generating the target speed of the current control period based on the target speed of the previous control period of the current control period and the ascending slope, to control the operation of the generator in the current control period.

[0102] The target rotating speed of the first control period can be obtained by PID control according to the bus current at the output end of the generator controller, and the target rotating speed of the subsequent control period is adjusted based on the rising slope, and the rising slope is determined according to the rotating speed deviation. Through sub-steps S201-S204, more precise control of the engine can be achieved, and the generator can be ensured to operate stably under different working conditions. In sub-step S201, the control mode of the engine is switched to adapt to different operating requirements, and the multiple control periods of the rotating speed control mode provide a basis for rapid adjustment. In sub-step S202, the target rotating speed is generated based on the bus signal, which can ensure that the generator operates at an appropriate rotating speed in the first control period. In sub-step S203, the actual rotating speed of the engine and the actual rotating speed of the generator are obtained, and the rotating speed deviation is calculated, so that the operating state of the generator can be understood in real time, and a basis is provided for adjusting the target rotating speed of the generator. In sub-step S204, the target rotating speed of the current control period is generated based on the initial target rotating speed of the previous control period and the rising slope, which can realize step-by-step adjustment of the rotating speed of the generator and avoid sudden changes that may cause impact on the system. Such an override control method not only improves the stability of the system, but also optimizes the operating efficiency of the generator.

[0103] In some embodiments, in order to avoid affecting the reliability of the shaft coupling, the override control in step S20 further includes the following sub-steps S205-S206.

[0104] Sub-step S205: Monitor the rotating speed deviation between the actual rotating speed of the engine and the actual rotating speed of the generator.

[0105] Sub-step S206: When the rotating speed deviation continues to increase and the rotating speed deviation at the current time is greater than a pre-set rotating speed deviation threshold, the rising slope is corrected based on the rotating speed deviation at the current time, so that the rising slope is reduced.

[0106] The rising slope is initially determined according to the rotating speed deviation, and then corrected based on the rotating speed deviation according to the change of the rotating speed deviation. If the actual rotating speed of the generator rises too fast, it will cause a rotating speed deviation between the actual rotating speed of the engine and the actual rotating speed of the generator, which will affect the reliability of the shaft coupling, so the rising slope needs to be corrected based on the rotating speed deviation. Through sub-steps S205-S206, a significant deviation between the actual rotating speed of the generator and the actual rotating speed of the engine can be effectively avoided, and the engine and the generator are protected from overload damage. In addition, this strategy dynamically adjusts the rising slope based on the rotating speed deviation, significantly improves the adaptability and stability of the range extender under complex working conditions, and ensures the smoothness and efficiency of system operation. This design not only optimizes the driver experience, but also prolongs the service life of the equipment.

[0107] As an exemplary embodiment, in this example, the target speed of the generator is calculated to be 1800 revolutions, the rising slope of the target speed is 1000 revolutions per second, and during the rising process of the actual speed of the engine and the actual speed of the generator, the speed deviation between the two gradually increases, and the speed deviation is greater than a certain value, then the rising slope of the target speed is corrected based on the speed deviation, for example, the speed deviation exceeds 10 revolutions, at this time the speed deviation in step S206 is updated to 12 revolutions, then the corrected rising slope is 800 revolutions per second, and if the speed deviation is 15 revolutions, the rising slope is 600 revolutions per second, which can clear the power as soon as possible while ensuring the reliability of the coupling.

[0108] In some embodiments, in order to ensure that the power of the range extender is smoothly output during power generation, the method further includes steps S70-S90.

[0109] Step S70: After ending the override control, in response to receiving the power generation instruction of the range extender, setting the control mode of the engine to the speed control mode and setting the control mode of the generator to the torque control mode.

[0110] Step S80: Obtaining the power generation demand power of the range extender hybrid vehicle.

[0111] Step S90: Setting the target torque of the generator in the torque control mode based on the power generation demand power of the range extender hybrid vehicle.

[0112] Through steps S70-S90, fine control of the range extender can be achieved to ensure efficient and stable power generation. In step S70, the control modes of the engine and the generator are adjusted to the speed control mode and the torque control mode respectively, which helps to achieve smooth output of power during power generation and avoid energy loss or system instability due to improper control mode. In step S80, the power generation demand power of the range extender hybrid vehicle is obtained in real time, providing accurate data support for subsequent torque setting and ensuring that the power generation process can meet the actual needs of the vehicle. In step S90, the target torque of the generator is dynamically adjusted based on the obtained power generation demand power, which not only improves the power generation efficiency but also helps to protect the generator from overload damage, further prolonging the service life of the equipment. In summary, through the fine control of steps S70-S90, the performance of the range extender during power generation is significantly improved.

[0113] Figure 5 A flowchart of an example of a method for controlling a range extender according to at least one embodiment of the present disclosure is provided. As shown in FIG. 7, the method includes steps S70-S90. Figure 5As shown, when receiving the clear power instruction of the range extender, the target torque of the engine is first set to zero, and the target speed of the generator is over-controlled. When the bus current value at the output end of the generator controller is greater than or equal to a first set value, and the actual torque of the engine is less than a second set value and is maintained for a certain time, the target speed of the generator is no longer over-controlled, the control mode of the generator controller is switched to the non-control mode, the actual speed of the engine freely falls to the idle speed, and the clear power process is completed.

[0114] Figure 6 A structural block diagram of a system for controlling a range extender is provided for at least one embodiment of the present disclosure. The system is applied to a range-extended hybrid vehicle with a range extender, and the range extender includes an engine, a generator and a generator controller. As shown in Figure 6 The system 10 for controlling the range extender includes a preprocessing unit 11, a first control unit 12 and a second control unit 13.

[0115] The preprocessing unit 11 is configured to send a first control instruction for setting the torque and speed of the generator to zero to the generator controller when the range extension system accesses high-voltage power supply and the range-extended hybrid vehicle has power generation demand.

[0116] The first control unit 12 is configured to implement over-control on the generator, and the over-control is configured to set the control mode of the generator to the speed control mode, and dynamically adjust the target speed of the generator based on the bus electrical signal at the output end of the generator controller in the speed control mode, so as to clear the power of the range extender by increasing the target speed of the generator.

[0117] The second control unit 13 is configured to monitor the bus electrical signal at the output end of the generator controller and the actual speed of the engine during the implementation of the over-control, and end the over-control when the bus electrical signal and the actual speed of the engine meet the pre-set clear power end condition, and set the control mode of the generator controller to the non-control mode, so as to reduce the actual speed of the engine to the idle speed.

[0118] The specific manner of the execution operation of each unit in the above system embodiment has been described in detail in the embodiment related to the method, and will not be described in detail here.

[0119] The embodiment of the present disclosure further provides a storage medium, and the storage medium stores a program or instructions, and the program or instructions realize the steps of the above method embodiments when executed by a processor.

[0120] The embodiment of the present disclosure further provides a program product, as shown in Figure 7 The program product includes one or more processors 21 and a memory 22, Figure 7 The processor 21 is taken as an example.

[0121] The controller can also include an input device 23 and an output device 24.

[0122] The processor 21, the memory 22, the input device 23 and the output device 24 can be connected by a bus or other means, Figure 7 For example, by a bus connection.

[0123] The processor 21 can be a central processing unit (CPU), and the processor 21 can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. chips, or combinations of the above-mentioned chips, and the general-purpose processor can be a microprocessor or any conventional processor.

[0124] The memory 22 is a non-transitory computer readable storage medium, which can be used to store non-transitory software programs, non-transitory computer executable programs and modules, such as program instructions / modules corresponding to the method in the embodiments of the present disclosure. The processor 21 executes various functions of the server and data processing by running the non-transitory software programs, instructions and modules stored in the memory 22, that is, implements the steps of the above method embodiments.

[0125] The memory 22 can include a program storage area and a data storage area, wherein the program storage area can store an operating system and at least one application program required by a function; the data storage area can store data created by the use of the processing device of the server operation, etc. In addition, the memory 22 can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device or other non-transitory solid-state storage device. In some embodiments, the memory 22 can optionally include a memory remotely arranged with respect to the processor 21, and these remote memories can be connected to the network connection device through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

[0126] The input device 23 can receive input digital or character information, and generate key signal input related to the driver settings and function control of the processing device of the server. The output device 24 can include a display device such as a display screen.

[0127] One or more modules are stored in the memory 22, which when executed by the one or more processors 21, perform the method as shown in Figure 1

[0128] Those skilled in the art can understand that all or part of the processes in the above-mentioned method embodiments can be completed by instructing the relevant hardware through a computer program. The program can be stored in a computer readable storage medium. When the program is executed, it can include the processes of the above-mentioned method embodiments. The storage medium can be a magnetic disc, an optical disc, a read-only memory (ROM), a random access memory (RAM), a flash memory (FM), a hard disk drive (HDD), or a solid-state drive (SSD), etc. The storage medium can also include a combination of the above-mentioned types of memories.

[0129] Although the embodiments of the present disclosure are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and such modifications and changes fall within the scope defined by the appended claims.

[0130] Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present disclosure, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present disclosure.​

Claims

1. A method for controlling a range extender, applied to a range-extended hybrid vehicle having a range extender, wherein the range extender includes an engine, a generator, and a generator controller, characterized in that: The method comprises: After receiving the power clearing instruction of the range extender, setting the control mode of the engine to the torque control mode and setting the target torque of the engine to zero; implementing an override control on the generator, wherein the override control is configured to set a control mode of the generator to a speed control mode, and dynamically adjust a target speed of the generator based on a bus electrical signal at an output end of the generator controller in the speed control mode, so as to clear power to the range extender by increasing the target speed of the generator; and During the implementation of the override control, the bus electrical signal and the actual speed of the engine are monitored, and when the bus electrical signal and the actual speed of the engine meet a preset power clearing end condition, the override control is terminated and the control mode of the generator controller is set to a non-control mode to reduce the actual speed of the engine to idle.

2. The method according to claim 1, characterized in that The extended-range hybrid vehicle includes a power battery connected to the generator controller, and the method further includes: During the range extender power generation process, obtaining vehicle data; Obtaining the charging power of the power battery and the power generation demand of the extended-range hybrid vehicle based on the vehicle data; and When the charging power of the power battery is triggered to be limited or the power generation demand of the range-extended hybrid vehicle drops to zero, first information indicating that the range extender has entered a power clearing operation process is output, and a power clearing instruction for the range extender is generated.

3. The method according to claim 1 or 2, characterized in that The method further comprises: During the process of implementing the overriding control, monitoring the bus electrical signal; In response to the signal value of the bus electrical signal being a negative value, sending second information indicating that the range extender is in a power generation state, and controlling the target speed of the generator to increase; and In response to the signal value of the bus electrical signal being converted from a negative value to a positive value, third information indicating that the range extender has cleared its generated power is sent.

4. The method according to claim 1 or 2, characterized in that The bus electrical signal is a bus current, and the power clearing end condition includes: The signal value of the bus electrical signal is greater than or equal to a first set value, wherein the first set value is used to indicate that the generator is not generating electricity; The actual torque of the engine is less than a second set value, wherein the second set value is used to indicate that the engine stops outputting power; and The signal value of the bus electrical signal is greater than or equal to a first set value and the actual torque of the engine is less than a second set value. The timing time required for both conditions to be met exceeds a set time, wherein the set time is used to exclude sudden changes in the bus current signal.

5. The method according to claim 1 or 2, characterized in that The overriding control includes: Switching the control mode of the engine from a current mode to a speed control mode, wherein the speed control mode is different from the current mode and has a plurality of control cycles; Acquiring the bus electrical signal, and generating a target speed of a first control cycle among the multiple control cycles based on the bus electrical signal to control the operation of the generator in the first control cycle; In each current control cycle after the first control cycle, obtaining the actual speed of the engine and the actual speed of the generator, and generating a rising slope of the target speed based on a speed deviation between the actual speed of the engine and the actual speed of the generator; and The target speed of the current control cycle is generated based on the target speed of the previous control cycle and the rising slope to control the operation of the generator in the current control cycle.

6. The method according to claim 5, characterized in that The overriding control also includes: monitoring a speed deviation between an actual speed of the engine and an actual speed of the generator; and, When the rotation speed deviation continues to increase and the rotation speed deviation at a current moment is greater than a preset rotation speed deviation threshold, the rising slope is corrected based on the rotation speed deviation at a current moment so that the rising slope decreases.

7. The method according to claim 4, characterized in that The first set value is greater than or equal to zero; and The second set value is configured to be related to the maximum net torque of the engine, and the second set value is less than a set percentage of the maximum net torque of the engine; The set time is configured to be related to a signal transmission cycle of the bus electrical signal, and the set time is greater than one of the signal transmission cycles.

8. The method according to claim 3, characterized in that The method further comprises: After the overriding control is terminated, in response to receiving a power generation instruction from the range extender, the control mode of the engine is set to a speed control mode, and the control mode of the generator is set to a torque control mode; Obtaining the power generation demand of the extended-range hybrid vehicle; and The target torque of the generator in the torque control mode is set based on the power generation demand of the extended-range hybrid vehicle.

9. A system for controlling a range extender, applied to a range-extended hybrid vehicle having a range extender, wherein the range extender includes an engine, a generator, and a generator controller, characterized in that: The system comprises: a pre-processing unit configured to, upon receiving a power clearing instruction from the range extender, set the control mode of the engine to a torque control mode and set the target torque of the engine to zero; a first control unit configured to implement an override control on the generator, wherein the override control is configured to set a control mode of the generator to a speed control mode, and dynamically adjust a target speed of the generator based on a bus electrical signal at an output end of the generator controller in the speed control mode, so as to clear power to the range extender by increasing the target speed of the generator; and The second control unit is configured to monitor the bus electrical signal and the actual speed of the engine during the implementation of the override control, and terminate the override control when the bus electrical signal and the actual speed of the engine meet a preset power clearing termination condition, and set the control mode of the generator controller to a non-control mode to reduce the actual speed of the engine to idle.

10. A storage medium, characterized in that: The storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

11. A program product comprising a program or instructions, characterized in that When the program or instruction is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

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