Methanol range extender control method and device, storage medium and electronic equipment

Abstract

The application provides a methanol range extender control method and device, a storage medium and an electronic equipment, and the method comprises the following steps: in the case that the methanol range extender is in a PTO power take-off mode, the methanol engine adopts a torque control mode, and the generator adopts a rotating speed control mode; the demand rotating speed corresponding to the accelerator pedal opening value is determined; the demand rotating speed is taken as the first target rotating speed of the generator, and the rotating speed control is implemented on the generator; the first demand power generation power and the current actual torque of the generator are obtained, and whether the current power generation condition of the generator matches the power generation demand is judged according to the first demand power generation power and the current actual torque; if the current power generation condition of the generator does not match the power generation demand, the torque of the generator is adjusted, and the current set torque of the methanol engine is obtained; the current set torque is adjusted based on the first demand power generation power and the current actual torque, the first target torque is obtained, and the torque control is implemented on the methanol engine. By applying the method, the control error caused by the rotating speed control of the methanol engine can be avoided, and the control accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle control technology, and in particular to a methanol range extender control method and device, storage medium and electronic equipment. Background Technology

[0002] With the development of electric vehicle technology, range-extended electric vehicles have been widely used in the vehicle field. Range-extended electric vehicles are equipped with a range-extending system, which is often also called a range extender system. The range extender, which is mainly composed of a motor and a generator, generates electricity to provide auxiliary power to the vehicle.

[0003] In the application scenarios of range-extended electric vehicles (REEVs), vehicles equipped with a power take-off (PTO) device are commonly seen. Currently, the control method of the range extender in this type of REEV typically adopts the control method of traditional diesel range extender systems, that is, the engine uses a speed control mode and the generator uses a torque control mode. PTO, also known as a power take-off unit, generally refers to a device that outputs power from the engine to specialized equipment on the vehicle.

[0004] With the development of energy technology, methanol range extender systems have gradually become one of the common range extender systems. The inventors discovered that when existing control methods are used in methanol range extender systems, due to the fuel characteristics of methanol engines, the response to engine speed control is slow and the speed control error is large when the engine uses speed control. It is usually difficult to achieve stable speed control, resulting in poor control accuracy of the range extender system and difficulty in ensuring the vehicle's operational needs. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a methanol range extender control method to solve the problem that existing range extender control methods have poor control accuracy for methanol range extender systems, making it difficult to guarantee vehicle operation requirements.

[0006] This invention also provides a methanol range extender control device to ensure the practical implementation and application of the above method.

[0007] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0008] A methanol range extender control method, comprising:

[0009] When the methanol range extender is in power take-off mode, the methanol engine in the methanol range extender is configured to torque control mode, and the generator in the methanol range extender is configured to speed control mode.

[0010] Obtain the current accelerator pedal opening value and determine the required engine speed corresponding to the accelerator pedal opening value;

[0011] The required speed corresponding to the accelerator pedal opening value is taken as the first target speed of the generator, and the generator speed is controlled by the first target speed.

[0012] Obtain the first required power generation capacity corresponding to the methanol range extender and the current actual torque of the generator;

[0013] Based on the first required power generation and the current actual torque, determine whether the current power generation of the generator matches the power generation demand of the methanol range extender;

[0014] If the current power generation of the generator does not match the power generation demand of the methanol range extender, the torque of the generator is adjusted to match the power generation of the generator with the power generation demand of the methanol range extender, and the current set torque of the methanol engine is obtained.

[0015] Based on the first required power generation and the current actual torque, the current set torque is adjusted to obtain the first target torque corresponding to the current set torque, and the methanol engine is torque controlled by the first target torque.

[0016] Optionally, in the above method, determining whether the current power generation of the generator matches the power generation demand of the methanol range extender based on the first required power generation and the current actual torque includes:

[0017] Based on the first required power generation and the first target speed, the torque is calculated to obtain the power generation torque required by the methanol range extender.

[0018] Determine the torque difference between the current actual torque and the torque required for power generation;

[0019] Determine whether the torque value difference is within a preset torque adjustment threshold range;

[0020] If the torque difference is not within the torque adjustment threshold range, it is determined that the current power generation of the generator does not match the power generation demand of the methanol range extender.

[0021] Optionally, in the above method, adjusting the currently set torque based on the first required power generation and the current actual torque to obtain the first target torque corresponding to the currently set torque includes:

[0022] If the torque difference indicates that the current actual torque is greater than the torque value required for power generation, then a difference calculation is performed between the current set torque and the preset engine torque step size, and the calculation result is used as the first target torque.

[0023] The above methods may also include:

[0024] If the torque difference indicates that the current actual torque is less than the torque value required for power generation, then the current set torque and the engine torque step size are summed, and the result is used as the first target torque.

[0025] The above methods may also include:

[0026] If the torque difference is within the torque adjustment threshold range, then it is determined that the current power generation of the generator matches the power generation demand of the methanol range extender.

[0027] The above methods may also include:

[0028] When the methanol range extender is not in the power take-off mode of the power output device, when the methanol range extender is in the power generation state, the methanol engine is configured to torque control mode and the generator is configured to speed control mode.

[0029] Obtain the second required power generation capacity corresponding to the methanol range extender;

[0030] The second target torque corresponding to the second required power generation is determined by using a preset optimal economic characteristic curve table, and torque control is implemented on the methanol engine using the second target torque.

[0031] The rotational speed is calculated based on the second required power output and the second target torque. The calculation result is used as the second target rotational speed of the generator, and the generator is controlled by the second target rotational speed.

[0032] The above methods may also include:

[0033] When the methanol range extender is not in the power take-off mode of the power output device, when the methanol range extender is not in the power generation state, the methanol engine is configured to speed control mode and the methanol engine is in the idling state.

[0034] Configure the generator to torque control mode and set the required torque of the generator to zero.

[0035] A methanol range extender control device, comprising:

[0036] The configuration unit is used to configure the methanol engine in the methanol range extender to torque control mode and the generator in the methanol range extender to speed control mode when the methanol range extender is in power take-off mode.

[0037] The first acquisition unit is used to acquire the current accelerator pedal opening value and determine the required speed corresponding to the accelerator pedal opening value.

[0038] The first control unit is used to take the required speed corresponding to the accelerator pedal opening value as the first target speed corresponding to the generator, and to perform speed control on the generator through the first target speed;

[0039] The second acquisition unit is used to acquire the first required power generation power corresponding to the methanol range extender and the current actual torque of the generator;

[0040] The judgment unit is used to determine whether the current power generation of the generator matches the power generation demand of the methanol range extender based on the first required power generation and the current actual torque.

[0041] The third acquisition unit is used to adjust the torque of the generator if the current power generation of the generator does not match the power generation demand of the methanol range extender, so as to match the power generation of the generator with the power generation demand of the methanol range extender, and to acquire the current set torque of the methanol engine.

[0042] The second control unit is used to adjust the current set torque based on the first required power generation and the current actual torque to obtain a first target torque corresponding to the current set torque, and to perform torque control on the methanol engine through the first target torque.

[0043] A storage medium comprising stored instructions, wherein, when the instructions are executed, the device in which the storage medium is located is controlled to perform the methanol range extender control method described above.

[0044] An electronic device includes a memory and one or more instructions, wherein one or more instructions are stored in the memory and configured to be executed by one or more processors as described above for a methanol range extender control method.

[0045] A methanol range extender control method based on the above embodiments of the present invention includes: when the methanol range extender is in power take-off mode, configuring the methanol engine in the methanol range extender in torque control mode and configuring the generator in the methanol range extender in speed control mode; obtaining the current throttle pedal opening value and determining the required speed corresponding to the throttle pedal opening value; using the required speed corresponding to the throttle pedal opening value as the first target speed corresponding to the generator, and performing speed control on the generator through the first target speed; obtaining the first required power generation of the methanol range extender and the current actual torque of the generator; judging whether the current power generation of the generator matches the power generation demand of the methanol range extender based on the first required power generation and the current actual torque; if the current power generation of the generator does not match the power generation demand of the methanol range extender, adjusting the torque of the generator to match the power generation demand of the methanol range extender, and obtaining the current set torque of the methanol engine; adjusting the current set torque based on the first required power generation and the current actual torque to obtain the first target torque corresponding to the current set torque, and performing torque control on the methanol engine through the first target torque. By applying the method provided in this invention, when the methanol range extender is in PTO (Power Take-Off) mode, speed control is applied to the generator and torque control is applied to the methanol engine. This avoids the problems of slow speed response, large speed control errors, and difficulty in achieving stable speed control in the methanol engine speed control mode, thereby improving the control accuracy of the range extender system and ensuring the overall operation requirements of the vehicle. Secondly, during the control process in PTO mode, the actual torque and required power output of the generator can be used to determine whether the generator's power generation matches the power generation demand. That is, it can be determined whether the generator is only used for power generation and just meets the power generation demand. This helps identify whether changes in the PTO required speed have led to excessive generator power output or whether the generator is assisting the PTO. If the generator's power generation does not match the power generation demand, the set torque of the engine can be adjusted as needed. This allows for timely control of the engine when the PTO required speed changes, ensuring that the engine torque can simultaneously meet both PTO and power generation demands, and ensuring that the PTO assistance comes from the engine, avoiding low energy conversion efficiency. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0047] Figure 1A flowchart of a methanol range extender control method provided in an embodiment of the present invention;

[0048] Figure 2 This is a control schematic diagram of a power output device provided in an embodiment of the present invention;

[0049] Figure 3 Another flowchart of a methanol range extender control method provided in this embodiment of the invention;

[0050] Figure 4 This is a schematic diagram of the structure of a methanol range extender control device provided in an embodiment of the present invention;

[0051] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0054] This invention provides a methanol range extender control method, which can be applied to range-extended electric vehicles based on a methanol range extender system. The executing entity can be a range extender controller, i.e., the controller of the methanol range extender. The method flowchart is shown below. Figure 1 As shown, it includes:

[0055] S101: When the methanol range extender is in the power output device power take-off mode, the methanol engine in the methanol range extender is configured to torque control mode, and the generator in the methanol range extender is configured to speed control mode.

[0056] In the method provided by this invention, when the range extender controller receives a power take-off request from the power output device (PTO) sent by the vehicle controller, it is considered that the methanol range extender enters the PTO power take-off mode, meaning that the methanol range extender's engine needs to provide power to the PTO. It can be understood that the methanol range extender is the range extender in a methanol range extender system, which includes a methanol engine and a generator, among other equipment. The methanol range extender system is equipped with an engine controller and a generator controller; the engine controller is used to perform the actual control operations on the methanol engine, and the generator controller is used to perform the actual control operations on the generator.

[0057] In the method provided by this embodiment of the invention, when the methanol range extender enters PTO power take-off mode, the range extender controller can send a torque control mode configuration command to the engine controller, causing the engine controller to switch the control mode of the methanol engine to torque control mode. Similarly, the range extender controller can send a speed control mode configuration command to the generator controller, causing the generator controller to switch the control mode of the generator to speed control mode. It should be noted that in actual operation, only one control mode switching operation is needed when the methanol range extender enters PTO power take-off mode. If the methanol engine is already in torque control mode and the generator is already in speed control mode before this, no change in control mode is required.

[0058] S102: Obtain the current accelerator pedal opening value and determine the required speed corresponding to the accelerator pedal opening value;

[0059] In the method provided by the embodiments of the present invention, the current accelerator pedal opening value of the vehicle can be obtained through the vehicle controller, and the speed that matches the current accelerator pedal opening value can be found in the preset accelerator pedal opening-speed relationship table, and the speed is used as the required speed corresponding to the current accelerator pedal opening value.

[0060] S103: The required speed corresponding to the accelerator pedal opening value is taken as the first target speed of the generator, and the generator is controlled by the first target speed.

[0061] In the method provided by this embodiment of the invention, the range extender controller can use the required speed corresponding to the current throttle pedal opening value as the target speed (i.e., the first target speed) of the generator, which is to say, this speed needs to be used as the set speed of the generator. The range extender controller can send the first target speed to the generator controller, instructing the generator controller to use the first target speed as the set speed of the generator, so as to implement speed control of the generator.

[0062] S104: Obtain the first required power generation capacity corresponding to the methanol range extender and the current actual torque of the generator;

[0063] In the method provided by this invention, the range extender controller can obtain the required power generation of the methanol range extender (i.e., the first required power generation) and the current actual torque of the generator in real time through the vehicle controller. The first required power generation is the power generation corresponding to the vehicle's electrical energy demand from the methanol range extender.

[0064] S105: Based on the first required power generation and the current actual torque, determine whether the current power generation of the generator matches the power generation demand of the methanol range extender;

[0065] In the method provided by the embodiments of the present invention, the range extender controller can measure the actual power generation of the generator based on the current actual torque of the generator and measure the power generation demand of the methanol range extender based on the first required power generation, and compare the actual power generation with the power generation demand to determine whether the current power generation of the generator matches the power generation demand of the methanol range extender.

[0066] Specifically, the relationship between torque, speed, and power can be expressed as follows:

[0067] T = 9550 P / n (Equation 1)

[0068] Where T represents torque, P represents power, and n represents rotational speed.

[0069] The generator employs a speed control mode, meaning it operates at a set speed. Based on Equation 1, the required power output or the generator's current actual torque can be converted, using parameters of the same attribute to represent both the power demand and the current power generation status. For example, the required power output can be converted into required torque to represent the power demand, while the generator's current actual torque represents the actual power generation status, allowing for a comparison between the actual power generation and the demand. Alternatively, the current actual torque can be converted into actual power output, with power representing both the actual power generation and the power demand for comparison.

[0070] Because when the methanol range extender is in PTO (Power Take-Off) mode, PTO typically only represents the demand through speed requirements, making it difficult to accurately estimate the load. Therefore, it's difficult to calculate an accurate torque value for engine control. Furthermore, as... Figure 2 As shown, Figure 2The motor mentioned refers to the generator. When entering PTO (Power Take-Off) mode, under normal circumstances, the engine directly assists the PTO. However, in some cases, the generator may participate in PTO assistance; that is, the engine first drives the generator to generate electricity, and then the generator drives the PTO. For example, when the PTO speed demand changes, because the generator responds quickly to speed changes, it is most likely that the generator will first adjust the speed by adjusting the torque. If the speed demand decreases, it may lead to excessive power generation or the generator participating in assistance. This embodiment of the invention uses the control strategies shown in steps S105-107 to control the methanol range extender accordingly, so as to ensure that the PTO is directly driven by the engine and accurately responds to power generation demands in PTO mode.

[0071] S106: If the current power generation of the generator does not match the power generation demand of the methanol range extender, the torque of the generator is adjusted to match the power generation of the generator with the power generation demand of the methanol range extender, and the current set torque of the methanol engine is obtained.

[0072] In the method provided by this invention, if it is determined that the current power generation of the generator does not match the power generation demand of the methanol range extender, the torque of the generator is adjusted to match the power generation of the generator with the power generation demand of the methanol range extender. For example, if the actual power generation of the generator exceeds the required power generation, the torque of the generator is adjusted to reduce the actual power generation. The range extender controller can calculate a new torque according to a predetermined adjustment method and send this torque to the generator controller, instructing the generator controller to adjust the generator torque to maintain the set speed of the generator. Conversely, if the actual power generation of the generator is less than the required power generation, the torque of the generator is adjusted to increase the actual power generation.

[0073] Meanwhile, when the generator's current power generation does not match the power generation demand, the range extender controller can obtain the current set torque of the methanol engine, which is the torque currently used to control the torque of the methanol engine.

[0074] In the method provided by this invention, if the current power generation of the generator matches the power generation demand of the methanol range extender, no other control operations are required. The methanol engine can use the current set torque for torque control.

[0075] S107: Based on the first required power generation and the current actual torque, adjust the current set torque to obtain the first target torque corresponding to the current set torque, and implement torque control on the methanol engine through the first target torque.

[0076] In the method provided by this invention, the range extender controller can adjust the torque based on the first required power generation and the current actual torque of the generator, and on the basis of the current set torque of the methanol engine. The set torque of the methanol engine is determined by the torque transfer method. That is, the direction of the engine torque adjustment is determined by the difference between the generator power generation and the power generation demand. The torque obtained by adjusting the methanol engine based on the current set torque is taken as the first target torque. The first target torque is sent to the engine controller, instructing the engine controller to take the first target torque as the set torque of the methanol engine, thereby implementing torque control of the methanol engine.

[0077] It should be noted that the control process provided in the embodiments of the present invention is only an explanation of a single control process of the methanol range extender. During the operation of the methanol range extender, the range extender controller can continuously control the methanol range extender, for example, executing a control process once every preset time interval (except for changes in control mode).

[0078] On the other hand, it should be noted that in the actual control process, if the methanol range extender is in a non-generating state before entering the PTO power take-off mode, that is, the power generation is 0 before and after entering the PTO power take-off mode, in this scenario, the initial set torque of the methanol engine will be 0 after entering the PTO power take-off mode. The generator's required speed is related to the accelerator pedal opening. When entering the PTO power take-off mode, in order to ensure the PTO drive demand, the generator may need to be in drive mode to maintain the speed, which has a positive torque.

[0079] Based on the method provided in this embodiment of the invention, when the methanol range extender is in power take-off mode, the methanol engine in the methanol range extender is configured in torque control mode, and the generator in the methanol range extender is configured in speed control mode; the current throttle pedal opening value is obtained, and the required speed corresponding to the throttle pedal opening value is determined; the required speed corresponding to the throttle pedal opening value is used as the first target speed corresponding to the generator, and speed control is performed on the generator through the first target speed; the first required power generation of the methanol range extender and the current actual torque of the generator are obtained; based on the first required power generation and the current actual torque, it is determined whether the current power generation of the generator matches the power generation demand of the methanol range extender; if the current power generation of the generator does not match the power generation demand of the methanol range extender, the torque of the generator is adjusted to match the power generation of the generator with the power generation demand of the methanol range extender, and the current set torque of the methanol engine is obtained; based on the first required power generation and the current actual torque, the current set torque is adjusted to obtain the first target torque corresponding to the current set torque, and torque control is performed on the methanol engine through the first target torque. By applying the method provided in this invention, when the methanol range extender is in PTO (Power Take-Off) mode, speed control is applied to the generator and torque control is applied to the methanol engine. This avoids the problems of slow speed response, large speed control errors, and difficulty in achieving stable speed control in the methanol engine speed control mode, thereby improving the control accuracy of the range extender system and ensuring the overall operation requirements of the vehicle. Secondly, during the control process in PTO mode, the actual torque and required power output of the generator can be used to determine whether the generator's power generation matches the power generation demand. That is, it can be determined whether the generator is only used for power generation and just meets the power generation demand. This helps identify whether changes in the PTO required speed have led to excessive generator power output or whether the generator is assisting the PTO. If the generator's power generation does not match the power generation demand, the set torque of the engine can be adjusted as needed. This allows for timely control of the engine when the PTO required speed changes, ensuring that the engine torque can simultaneously meet both PTO and power generation demands, and ensuring that the PTO assistance comes from the engine, avoiding low energy conversion efficiency.

[0080] exist Figure 1 Based on the method shown, refer to Figure 3 The flowchart shown illustrates the process in step S105 of the method provided in this embodiment of the invention, which involves determining whether the current power generation of the generator matches the power generation demand of the methanol range extender based on the first required power generation and the current actual torque. This process includes:

[0081] S201: Based on the first required power generation and the first target speed, torque is calculated to obtain the power generation torque required by the methanol range extender;

[0082] In the method provided by this embodiment of the invention, the first target speed is the set speed of the generator, which is also the power generation demand speed of the methanol range extender. Based on the first demand power generation and the first target speed, torque is calculated using Equation 1, and the calculation result is the power generation demand torque of the methanol range extender. Specifically, the first demand power generation can be multiplied by a coefficient of 9550, and the product of the two can be divided by the first target speed. The final calculation result is the power generation demand torque.

[0083] S202: Determine the torque difference between the current actual torque and the torque required for power generation;

[0084] In the method provided by this invention, the difference between the current actual torque of the generator and the torque required for power generation can be calculated through difference operations. The torque difference refers to the difference in magnitude between the two torque values ​​corresponding to the power generation effect. In practical applications, the torque parameter carries a positive or negative sign. In actual data processing, it can be calculated using absolute value processing or with the torque sign included, depending on the appropriate interpretation method employed.

[0085] S203: Determine whether the torque value difference is within the preset torque adjustment threshold range;

[0086] In the method provided by this invention, a torque adjustment threshold range can be preset according to the matching accuracy requirements. The torque value difference is compared with the upper and lower limits of the torque adjustment threshold range to determine whether the torque value difference falls within the preset torque adjustment threshold range.

[0087] S204: If the torque difference is not within the torque adjustment threshold range, it is determined that the current power generation of the generator does not match the power generation demand of the methanol range extender.

[0088] In the method provided by this embodiment of the invention, if it is determined that the torque value difference is not within the preset torque adjustment threshold range, it is considered that the current power generation of the generator does not match the power generation demand of the methanol range extender.

[0089] Based on the method provided in this embodiment of the invention, the power generation status and power generation demand of the generator are measured by torque, and the matching status of power generation status and power generation demand is judged by the torque adjustment threshold range. The torque adjustment threshold range can reflect the actual control error. In actual control scenarios, parameter control usually has a certain error. Therefore, the adaptability of the matching judgment process of power generation status and power generation demand to actual control scenarios can be improved.

[0090] existFigure 3 Based on the method shown, in the method provided by the embodiments of the present invention, the process mentioned in step S107 of adjusting the current set torque based on the first required power generation and the current actual torque to obtain the first target torque corresponding to the current set torque includes:

[0091] If the torque difference indicates that the current actual torque is greater than the torque value required for power generation, then a difference calculation is performed between the current set torque and the preset engine torque step size, and the calculation result is used as the first target torque.

[0092] In the method provided by this invention, the direction of adjusting the engine's set torque can be determined by using the torque difference calculated based on the first required power generation and the current actual torque. Specifically, if the torque difference indicates that the current actual torque of the generator is greater than the required torque, meaning the actual power generation exceeds the required power generation, then the engine's set torque needs to be reduced.

[0093] In the method provided by the embodiments of the present invention, an engine torque step size is preset. When it is necessary to reduce the set torque of the engine, the engine torque step size can be subtracted from the current set torque of the engine, and the difference between the current set torque and the engine torque step size is used as the first target torque, which is the new set torque of the engine.

[0094] Based on the method provided in the embodiments of the present invention, the current set torque can be adjusted by a preset engine torque step size, which helps to avoid engine speed and torque overshoot.

[0095] Based on the methods provided in the above embodiments, the methods provided in the embodiments of the present invention further include:

[0096] If the torque difference indicates that the current actual torque is less than the torque value required for power generation, then the current set torque and the engine torque step size are summed, and the result is used as the first target torque.

[0097] In the method provided by this invention, if the torque difference, representing the current actual torque value, is less than the torque value required for power generation (i.e., the actual power generation is less than the required power generation), then the engine's set torque needs to be increased. Specifically, based on the engine's current set torque, an engine torque step size is added, and the sum of the current set torque and the engine torque step size is used as the first target torque.

[0098] exist Figure 3 Based on the method shown, the method provided in this embodiment of the invention further includes:

[0099] If the torque difference is within the torque adjustment threshold range, then it is determined that the current power generation of the generator matches the power generation demand of the methanol range extender.

[0100] In the method provided by this invention, when the torque difference is within the torque adjustment threshold range, it is considered that the generator's power generation is matched with the power generation demand of the methanol range extender, and no additional control adjustment is required for the generator and engine.

[0101] exist Figure 1 Based on the method shown, the method provided in this embodiment of the invention further includes:

[0102] When the methanol range extender is not in the power take-off mode of the power output device, when the methanol range extender is in the power generation state, the methanol engine is configured to torque control mode and the generator is configured to speed control mode.

[0103] In the method provided by this invention, if the PTO (Power Take-Off) has no power demand, i.e., the methanol range extender is not in PTO power take-off mode, when the methanol range extender system receives a power generation demand from the vehicle controller, the methanol range extender enters the power generation state. At this time, the range extender controller can send configuration commands to the engine controller and generator controller respectively, so that the methanol engine switches to torque control mode and the generator switches to speed control mode. It is understood that the mode configuration operation only needs to be performed once when the methanol range extender enters the power generation state. If the methanol engine is already in torque control mode and the generator is already in speed control mode before this, the original mode can be maintained.

[0104] Obtain the second required power generation capacity corresponding to the methanol range extender;

[0105] In the method provided by this embodiment of the invention, the range extender controller can obtain the required power generation of the methanol range extender at this time (i.e., the second required power generation) through the vehicle controller.

[0106] The second target torque corresponding to the second required power generation is determined by using a preset optimal economic characteristic curve table, and torque control is implemented on the methanol engine using the second target torque.

[0107] In the method provided by this invention, a corresponding torque can be found in a preset optimal economic characteristic curve table based on the second required power generation. The torque matching the second required power generation is then used as the second target torque. This second target torque is sent to the engine controller, instructing it to use it as the set torque for the methanol engine, thereby implementing torque control on the methanol engine.

[0108] The rotational speed is calculated based on the second required power output and the second target torque. The calculation result is used as the second target rotational speed of the generator, and the generator is controlled by the second target rotational speed.

[0109] In the method provided by this embodiment of the invention, the rotational speed corresponding to the second required power generation and the second target torque can be calculated based on Equation 1. The calculated rotational speed is then used as the second target rotational speed. Specifically, the second required power generation can be multiplied by a coefficient of 9550, and the product can be divided by the second target torque. The final calculation result is then used as the second target rotational speed. The second target rotational speed is sent to the generator controller, instructing the generator controller to use the second target rotational speed as the set rotational speed of the generator, thereby implementing speed control on the generator.

[0110] Based on the method provided in this embodiment of the invention, when the methanol range extender is in the power generation state, torque control can be applied to the methanol engine and speed control can be applied to the generator. This can avoid the problems of slow speed response, large speed control error, and difficulty in achieving stable speed control of the methanol engine in the speed control mode, thereby improving the control accuracy of the range extender system and helping to ensure the vehicle's operating needs.

[0111] exist Figure 1 Based on the method shown, the method provided in this embodiment of the invention further includes:

[0112] When the methanol range extender is not in the power take-off mode of the power output device, when the methanol range extender is not in the power generation state, the methanol engine is configured to speed control mode and the methanol engine is in the idling state.

[0113] Configure the generator to torque control mode and set the required torque of the generator to zero.

[0114] In the method provided by this embodiment of the invention, when the PTO power take-off mode is not activated, if the methanol range extender is in a non-generating state, that is, the methanol range extender system currently has no power generation demand, the methanol engine is configured to speed control mode, and the generator is configured to torque control mode. The methanol engine is made to idle, and the generator torque is set to zero.

[0115] Based on the method provided in the embodiments of the present invention, when the methanol range extender has no PTO power take-off requirement and no power generation requirement, the methanol engine can be allowed to idle, and the generator torque can be set to zero, thereby saving energy consumption.

[0116] To better illustrate the methods provided in the embodiments of the present invention, based on the methods provided in the preceding embodiments and in combination with actual application scenarios, the embodiments of the present invention provide yet another methanol range extender control method.

[0117] The overall control method of the methanol range extender provided in this embodiment of the invention will be briefly described below. The control process of the methanol range extender provided in this embodiment of the invention mainly includes:

[0118] When the methanol range extender has no PTO demand and no power generation demand, the methanol engine operates in speed control mode to maintain its idle speed, while the generator is in torque control mode to set its required torque to 0.

[0119] When the methanol range extender has no PTO (Power Toll Collection) requirement, but a power generation requirement, the methanol engine is in torque control mode, and the generator is in speed control mode. The set torque of the methanol engine is obtained from the optimal economic characteristic curve table based on the range extender's required power generation. The set speed of the generator is calculated based on Equation 1, specifically by multiplying the required power generation by a coefficient of 9550 after unit conversion, and then dividing it by the set torque of the methanol engine.

[0120] When the methanol range extender has a PTO (Power Toll-Off) requirement, the methanol engine is put into torque control mode, and the generator is put into speed control mode. The generator's set speed is obtained by looking up a table based on the accelerator pedal opening. Specifically, the current accelerator pedal opening value can be obtained, and the speed matching the current accelerator pedal opening value can be found in the preset accelerator pedal opening-speed relationship table, which is then used as the generator's set speed.

[0121] Since the PTO load cannot be accurately predicted, the engine's set torque cannot be directly adjusted. Therefore, the engine's set torque is adjusted through torque transfer. The purpose is to ensure the required power generation while guaranteeing that all PTO assistance comes from the engine, thus avoiding low energy conversion efficiency. Specifically, based on the range extender's required power generation and the generator's actual torque, it can be determined whether the generator's torque is solely for power generation and precisely meets the demand. Specifically, the required torque corresponding to the required power generation can be calculated using the torque-speed-power conversion relationship (Equation 1). By comparing the required torque with the generator's actual torque, the relationship between the generator's actual power generation and the required power generation can be measured. If it is determined that the generator's actual power generation exceeds the required power generation, the methanol engine's set torque is reduced, and the generator needs to maintain the set speed by reducing the generating torque. If the generator's actual power generation does not meet the required power generation, the methanol engine's set torque is increased, and the generator needs to maintain the set speed by increasing the generating torque. This ensures both the required power generation and prevents low energy conversion efficiency. Specifically, an engine torque step size can be set. When adjusting the set torque of a methanol engine, the current set torque can be increased or decreased by the set torque step size to obtain a new set torque. By adjusting the set engine torque step size, engine speed and torque overshoot can be avoided.

[0122] Specifically, if the required power generation is 0 before and after entering PTO power take-off mode, the engine speed is controlled before entering PTO mode and the torque is controlled after entering PTO mode. After entering PTO mode, the initial set torque of the methanol engine is 0. The generator's required speed is related to the accelerator pedal opening. Therefore, when entering PTO mode, in order to ensure the PTO drive demand, the generator may need to be in drive mode to maintain the speed, which has a positive torque. The range extender can then be controlled using the above control logic.

[0123] Based on the method provided in this invention, when the methanol range extender system is operating, a torque control mode can be used for the methanol engine of the methanol range extender, and a speed control mode can be used for the generator. This avoids problems such as slow speed response and large errors of the methanol engine, and leverages the generator's fast response and good speed stability. When entering PTO power take-off mode, it ensures both PTO drive requirements and real-time accurate response to power generation demands. Simultaneously, within the methanol engine's drive capability range, it ensures that the PTO is directly driven by the methanol engine as much as possible, avoiding the low energy conversion efficiency caused by generator assistance. Furthermore, it avoids speed fluctuations caused by active speed regulation of the methanol engine, preventing excessive vibration of the methanol range extender system.

[0124] and Figure 1Corresponding to the methanol range extender control method shown, this embodiment of the invention also provides a methanol range extender control device for controlling... Figure 1 The specific implementation of the method shown is illustrated in the following diagram. Figure 4 As shown, it includes:

[0125] Configuration unit 301 is used to configure the methanol engine in the methanol range extender to torque control mode and the generator in the methanol range extender to speed control mode when the methanol range extender is in power output device power take-off mode.

[0126] The first acquisition unit 302 is used to acquire the current accelerator pedal opening value and determine the required speed corresponding to the accelerator pedal opening value.

[0127] The first control unit 303 is used to take the required speed corresponding to the throttle pedal opening value as the first target speed corresponding to the generator, and to perform speed control on the generator through the first target speed;

[0128] The second acquisition unit 304 is used to acquire the first required power generation power corresponding to the methanol range extender and the current actual torque of the generator;

[0129] The judgment unit 305 is used to determine whether the current power generation of the generator matches the power generation demand of the methanol range extender based on the first required power generation and the current actual torque.

[0130] The third acquisition unit 306 is used to adjust the torque of the generator if the current power generation of the generator does not match the power generation demand of the methanol range extender, so as to match the power generation of the generator with the power generation demand of the methanol range extender, and to acquire the current set torque of the methanol engine.

[0131] The second control unit 307 is used to adjust the current set torque based on the first required power generation and the current actual torque to obtain a first target torque corresponding to the current set torque, and to perform torque control on the methanol engine through the first target torque.

[0132] By applying the device provided in this embodiment of the invention, when the methanol range extender is in PTO power take-off mode, speed control is applied to the generator and torque control is applied to the methanol engine. This avoids the problems of slow speed response, large speed control error, and difficulty in achieving stable speed control of the methanol engine in speed control mode, thereby improving the control accuracy of the range extender system and helping to ensure the overall operation requirements of the vehicle. Secondly, during the control process in PTO power take-off mode, by using the actual torque and required power generation of the generator, it is possible to determine whether the generator's power generation matches the power generation demand, that is, whether the generator is only used for power generation and just meets the power generation demand. This helps to identify whether the generator's power generation is too high or whether the generator is assisting the PTO due to changes in the required PTO speed. If the generator's power generation does not match the power generation demand, the set torque of the engine can be adjusted as needed to promptly control the engine when the required PTO speed changes. This helps to ensure that the engine torque can simultaneously meet the PTO and power generation demands, and ensures that the PTO assistance comes from the engine, avoiding low energy conversion efficiency.

[0133] exist Figure 4 Based on the device shown, the device provided in this embodiment of the invention can be further extended to include multiple units. The functions of each unit can be found in the descriptions of the various embodiments of the methanol range extender control method provided above, and will not be further illustrated here.

[0134] This invention also provides a storage medium that includes stored instructions, wherein when the instructions are executed, the device containing the storage medium is controlled to perform the methanol range extender control method described above.

[0135] This invention also provides an electronic device, the structural schematic of which is shown below. Figure 5 As shown, it specifically includes a memory 401 and one or more instructions 402, wherein one or more instructions 402 are stored in the memory 401 and configured to be executed by one or more processors 403 to perform the following operations:

[0136] When the methanol range extender is in power take-off mode, the methanol engine in the methanol range extender is configured to torque control mode, and the generator in the methanol range extender is configured to speed control mode.

[0137] Obtain the current accelerator pedal opening value and determine the required engine speed corresponding to the accelerator pedal opening value;

[0138] The required speed corresponding to the accelerator pedal opening value is taken as the first target speed of the generator, and the generator speed is controlled by the first target speed.

[0139] Obtain the first required power generation capacity corresponding to the methanol range extender and the current actual torque of the generator;

[0140] Based on the first required power generation and the current actual torque, determine whether the current power generation of the generator matches the power generation demand of the methanol range extender;

[0141] If the current power generation of the generator does not match the power generation demand of the methanol range extender, the torque of the generator is adjusted to match the power generation of the generator with the power generation demand of the methanol range extender, and the current set torque of the methanol engine is obtained.

[0142] Based on the first required power generation and the current actual torque, the current set torque is adjusted to obtain the first target torque corresponding to the current set torque, and the methanol engine is torque controlled by the first target torque.

[0143] The electronic device in this embodiment of the invention can be the range extender controller in the methanol range extender system of a range-extended electric vehicle. Alternatively, it can be other functional ECUs (Electronic Control Units), MCUs (Micro Controller Units), etc.

[0144] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0145] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0146] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for a methanol range extender, characterized in that, include: When the methanol range extender is in the PTO (Power Take-Off) mode, the engine of the methanol range extender needs to provide power to the PTO. The methanol engine in the methanol range extender is configured in torque control mode, and the generator in the methanol range extender is configured in speed control mode. Obtain the current accelerator pedal opening value and determine the required engine speed corresponding to the accelerator pedal opening value; The required speed corresponding to the accelerator pedal opening value is taken as the first target speed of the generator, and the generator speed is controlled by the first target speed. Obtain the first required power generation capacity corresponding to the methanol range extender and the current actual torque of the generator; Based on the first required power generation and the current actual torque, determine whether the current power generation of the generator matches the power generation demand of the methanol range extender. This includes: calculating the torque based on the first required power generation and the first target speed to obtain the power generation demand torque corresponding to the methanol range extender; determining the torque value difference between the current actual torque and the power generation demand torque; determining whether the torque value difference is within a preset torque adjustment threshold range; if the torque value difference is not within the torque adjustment threshold range, then determine that the current power generation of the generator does not match the power generation demand of the methanol range extender. If the current power generation of the generator does not match the power generation demand of the methanol range extender, the torque of the generator is adjusted to match the power generation of the generator with the power generation demand of the methanol range extender, and the current set torque of the methanol engine is obtained. Based on the torque difference, the current set torque is adjusted to obtain a first target torque corresponding to the current set torque, and the methanol engine is torque controlled by the first target torque; When the methanol range extender is not in the PTO power take-off mode of the power output device, when the methanol range extender is in the power generation state, the methanol engine is configured to torque control mode and the generator is configured to speed control mode. The target torque of the engine and the target speed of the generator are determined based on the required power generation and the preset optimal economic characteristic curve table. When the methanol range extender is not in the PTO power take-off mode of the power output device, and when the methanol range extender is not in the power generation state, the methanol engine is configured to speed control mode and the methanol engine is in the idling state. Configure the generator to torque control mode and set the required torque of the generator to zero.

2. The method according to claim 1, characterized in that, The step of adjusting the current set torque based on the torque value difference to obtain the first target torque corresponding to the current set torque includes: If the torque difference indicates that the current actual torque is greater than the torque value required for power generation, then a difference calculation is performed between the current set torque and the preset engine torque step size, and the calculation result is used as the first target torque.

3. The method according to claim 2, characterized in that, Also includes: If the torque difference indicates that the current actual torque is less than the torque value required for power generation, then the current set torque and the engine torque step size are summed, and the result is used as the first target torque.

4. The method according to claim 1, characterized in that, Also includes: If the torque difference is within the torque adjustment threshold range, then it is determined that the current power generation of the generator matches the power generation demand of the methanol range extender.

5. The method according to claim 1, characterized in that, Also includes: When the methanol range extender is not in the PTO power take-off mode of the power output device, when the methanol range extender is in the power generation state, the second required power generation power corresponding to the methanol range extender is obtained. The second target torque corresponding to the second required power generation is determined by using a preset optimal economic characteristic curve table, and torque control is implemented on the methanol engine using the second target torque. The rotational speed is calculated based on the second required power output and the second target torque. The calculation result is used as the second target rotational speed of the generator, and the generator is controlled by the second target rotational speed.

6. A methanol range extender control device, characterized in that, include: The configuration unit is used to configure the methanol engine in the methanol range extender to torque control mode and the generator in the methanol range extender to speed control mode when the methanol range extender is in the power take-off mode (PTO) and the engine of the methanol range extender needs to provide power to the power take-off device. The first acquisition unit is used to acquire the current accelerator pedal opening value and determine the required speed corresponding to the accelerator pedal opening value. The first control unit is used to take the required speed corresponding to the accelerator pedal opening value as the first target speed corresponding to the generator, and to perform speed control on the generator through the first target speed; The second acquisition unit is used to acquire the first required power generation power corresponding to the methanol range extender and the current actual torque of the generator; The judgment unit is used to determine whether the current power generation of the generator matches the power generation demand of the methanol range extender based on the first required power generation and the current actual torque. This includes: calculating the torque based on the first required power generation and the first target speed to obtain the required torque for the methanol range extender; determining the torque difference between the current actual torque and the required torque; determining whether the torque difference is within a preset torque adjustment threshold range; and if the torque difference is not within the torque adjustment threshold range, determining that the current power generation of the generator does not match the power generation demand of the methanol range extender. The third acquisition unit is used to adjust the torque of the generator if the current power generation of the generator does not match the power generation demand of the methanol range extender, so as to match the power generation of the generator with the power generation demand of the methanol range extender, and to acquire the current set torque of the methanol engine. The second control unit is used to adjust the current set torque based on the torque value difference to obtain a first target torque corresponding to the current set torque, and to perform torque control on the methanol engine through the first target torque; The methanol range extender control device is also used for: When the methanol range extender is not in the PTO power take-off mode of the power output device, when the methanol range extender is in the power generation state, the methanol engine is configured to torque control mode and the generator is configured to speed control mode. The target torque of the engine and the target speed of the generator are determined based on the required power generation and the preset optimal economic characteristic curve table. When the methanol range extender is not in the PTO power take-off mode of the power output device, and when the methanol range extender is not in the power generation state, the methanol engine is configured to speed control mode and the methanol engine is in the idling state. Configure the generator to torque control mode and set the required torque of the generator to zero.

7. A storage medium, characterized in that, The storage medium includes stored instructions, wherein, when the instructions are executed, the device containing the storage medium is controlled to perform the methanol range extender control method as described in any one of claims 1 to 5.

8. An electronic device, characterized in that, It includes a memory and one or more instructions, wherein one or more instructions are stored in the memory and configured to be executed by one or more processors as described in any one of claims 1 to 5.

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