Starting method of extended-range electric vehicle, extended-range electric vehicle and storage medium

Abstract

The invention provides a starting method of an extended-range electric vehicle, the extended-range electric vehicle and a storage medium, and relates to the technical field of vehicle starting. According to the method, a power control domain module sends a starting signal to a battery management module under the condition that a preset starting condition is met. And the battery management module controls the power battery to discharge the start-up duration to the engine based on the start-up discharge power. Therefore, the discharge power does not need to be searched from the preset discharge power table according to the temperature and the SOC of the power battery, so that the engine can be normally started even under the extremely cold condition or under the condition that the SOC is inaccurate, and the starting reliability of the engine is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle starting technology, and more particularly to a starting method for a range-extended electric vehicle, the range-extended electric vehicle, and a storage medium. Background Technology

[0002] A range-extended electric vehicle is an electric vehicle equipped with an onboard auxiliary power generation system (also known as a range extender), which consists of an engine, generator, and controller. When the onboard rechargeable energy storage system cannot meet the vehicle's range requirements, the range extender provides electrical energy to the vehicle's power system.

[0003] Currently, one starting method for range-extended electric vehicles (REEVs) involves determining the temperature and state of charge (SOC) of the battery, and then finding the discharge power from a pre-set discharge power table based on these parameters. The battery then discharges to the engine according to the specified discharge power to start the engine.

[0004] However, discharge power meters typically only display the discharge power at normal temperatures (e.g., -30℃ to 55℃). If a range-extended electric vehicle is in extremely cold conditions (e.g., below -30℃), the discharge power cannot be found in the preset discharge power meter, causing the engine to fail to start. Furthermore, due to accumulated errors during battery pack use, the cumulative SOC of the power battery becomes inaccurate. If the cumulative SOC of the power battery is low, the detected discharge power will also be low, which will also prevent the engine from starting. Summary of the Invention

[0005] This application provides a starting method for a range-extended electric vehicle, a range-extended electric vehicle, and a storage medium to solve the problem in the prior art where the engine cannot start normally under certain conditions.

[0006] Firstly, this application provides a starting method for a range-extended electric vehicle, applicable to a range-extended electric vehicle. The range-extended electric vehicle includes a power control domain module, a battery management module, a power battery, and an engine. The power control domain module is electrically connected to the battery management module, the battery management module is electrically connected to the power battery, and the power battery is electrically connected to the engine. The method provided in this application includes: When the preset start-up conditions are met, the power control domain module sends a start-up signal to the battery management module. The start-up signal carries the start-up discharge power and start-up duration. The battery management module controls the start-up duration by which the power battery discharges to the engine based on the start-up discharge power. After confirming that the engine has started successfully, the power control domain module charges the power battery based on the engine until the power battery reaches the set power threshold.

[0007] In some embodiments, after the battery management module controls the power battery to discharge to the engine for a start-up duration based on the start-up discharge power, the method provided in this application further includes: After determining that the engine has failed to start, the power control domain module sends a start failure signal to the battery management module. In response to a start failure signal, the battery management module controls the power battery to stop discharging to the engine.

[0008] In some embodiments, after the battery management module controls the power battery to stop discharging to the engine, the method provided in this application further includes: Record the number of times the engine failed to start; If the number of engine start failures is less than the set threshold, wait for a preset time. Return to the step where the power control domain module sends a start signal to the battery management module, until the number of engine start failures reaches the set threshold.

[0009] In some implementations, after the number of engine start failures reaches a set threshold, the method further includes: The power control domain module determines whether the engine has started successfully. If it is determined that the engine has failed to start, the power control domain module will output a message indicating that the engine has failed to start.

[0010] In some implementations, if it is determined that the engine failed to start, a prompt message indicating the engine start failure is output, including: If it is determined that the engine has failed to start, the operating parameters of the power battery are obtained from the battery management module. Determine the cause of engine start failure based on the operating parameters of the power battery; Output a message indicating that the engine failed to start, including the reason for the failure.

[0011] In some implementations, the cause of engine start-up failure is determined based on the operating parameters of the power battery, including: When the operating parameters of the power battery are abnormal, the cause of the engine start failure is determined to be a power battery malfunction. If the operating parameters of the power battery are not abnormal, the cause of the engine start failure is determined to be an engine malfunction.

[0012] In some embodiments, the power battery includes multiple cells, each cell is equipped with a voltage sensor, and each voltage sensor is electrically connected to the power control domain module. The method further includes: During the process of controlling the power battery to discharge to the engine, the power control domain module receives the cell voltage collected by each voltage sensor; If the minimum cell voltage among the multiple cell voltages received is less than the set discharge cutoff voltage, the power control domain module sends a stop discharge signal to the battery management module. The battery management module controls the power battery to stop discharging to the engine.

[0013] Secondly, this application provides a range-extended electric vehicle, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it causes the range-extended electric vehicle to perform the method provided in the first aspect of this application.

[0014] Thirdly, this application also provides a storage medium storing a computer program, which, when executed by a processor, causes the computer to perform the method provided in the first aspect of this application.

[0015] Fourthly, this application also provides a computer program product, including a computer program that, when run, causes a range-extended electric vehicle to perform the method provided in the first aspect of this application.

[0016] This application provides a starting method for a range-extended electric vehicle, the range-extended electric vehicle, and a storage medium. The power control domain module sends a start-up signal to the battery management module when preset start-up conditions are met. The battery management module controls the power battery to discharge to the engine for a start-up duration based on the start-up discharge power. This eliminates the need to look up the discharge power from a preset discharge power table based on the power battery's temperature and state of charge (SOC), allowing the engine to start normally even under extreme cold conditions or when the SOC is inaccurate, thus improving the reliability of engine starting. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A circuit module connection block diagram of a range-extended electric vehicle provided in an embodiment of this application; Figure 2 A flowchart illustrating the starting method of a range-extended electric vehicle provided in an embodiment of this application; Figure 3A functional block diagram of the starting device for a range-extended electric vehicle provided in an embodiment of this application. Detailed Implementation

[0019] Embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0020] The accompanying drawings illustrate various structural schematics according to embodiments of the present disclosure. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0021] In the context of this disclosure, when a layer / element is referred to as being "above" another layer / element, the layer / element may be directly above the other layer / element, or there may be an intermediate layer / element between them. Additionally, if a layer / element is "above" another layer / element in one orientation, then when the orientation is reversed, the layer / element may be "below" the other layer / element.

[0022] The technical solutions of this application and how they solve the aforementioned technical problems will be described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0023] This application provides a starting method for a range-extended electric vehicle, applicable to range-extended electric vehicles. For example... Figure 1 As shown, a range-extended electric vehicle includes a Power Domain Control Module (PDCM), a Battery Management Module, a power battery, and an engine. The PDCM is electrically connected to the Battery Management Module, the Battery Management Module is electrically connected to the power battery, and the power battery is electrically connected to the engine. Figure 2 As shown, the method provided in this application embodiment includes: S201: The power control domain module sends a start signal to the battery management module when the preset start conditions are met.

[0024] The start signal carries the start-up discharge power and start-up duration. The start-up discharge power and start-up duration are the required start-up discharge power and start-up duration to enable engine start-up; different engine models have different start-up discharge power and start-up durations. For example, the start-up signal can be represented as 0x1: Cold Start Request.

[0025] It should be noted that the preset start-up conditions can be, but are not limited to, detecting an ignition command.

[0026] S202: The battery management module controls the start-up duration by which the power battery discharges to the engine based on the start-up discharge power.

[0027] For example, the start-up discharge power can be, but is not limited to, 10KW, 12KW, and 15KW, and the start-up time can be, but is not limited to, 2s, 3s, or 4s, etc., which are not limited here.

[0028] S203: After confirming that the engine has started successfully, the power control domain module charges the power battery based on the engine until the power battery reaches the set power threshold.

[0029] It should be noted that after the power control domain module confirms that the engine has started successfully, it can send a start success notification to the battery management module. The start success notification can be expressed as "No Cold Start Request".

[0030] For example, the set battery threshold can be, but is not limited to, 90%, 95%, or 98%, etc., and is not limited here.

[0031] In addition, the method provided in this application embodiment also includes: Step 1: After determining that the engine has failed to start, the power control domain module sends a start failure signal to the battery management module.

[0032] For example, a startup failure signal can be represented as 0x3: Cold Start failure.

[0033] Step 2: In response to the start failure signal, the battery management module controls the power battery to stop discharging to the engine.

[0034] Furthermore, after step 2, the method provided in this application embodiment further includes: Step 3: Record the number of times the engine failed to start.

[0035] Step 4: Determine if the number of engine start failures is less than the set threshold. If so, proceed to Step 5.

[0036] For example, the set threshold number of times can be, but is not limited to, 2 times, 3 times, or 4 times, etc., and is not limited here.

[0037] Step 5: Wait for the preset time, then return to the step of the power control domain module sending a start signal to the battery management module, until the number of engine start failures reaches the set threshold.

[0038] For example, the preset duration can be, but is not limited to, 5s, 10s, 15s, etc., and is not limited here. Based on the above steps 3-5, the engine can be started more reliably.

[0039] In addition, after step 5, the method provided in this embodiment further includes: the power control domain module determining whether the engine has started successfully; if it is determined that the engine has not started successfully, the power control domain module outputs a prompt message indicating that the engine has failed to start. This allows the user to be aware that the engine has failed to start.

[0040] Specifically, if it is determined that the engine failed to start, the system retrieves the operating parameters of the power battery (such as the voltage, power, and current of each cell) from the battery management module. Based on these parameters, the system determines the cause of the engine start failure and outputs a prompt message indicating the reason for the failure. This informs the user of the specific reason for the engine start failure, allowing them to take appropriate action.

[0041] For example, if the operating parameters of the power battery are abnormal, the cause of the engine start failure is determined to be a power battery malfunction; conversely, if the operating parameters of the power battery are not abnormal, the cause of the engine start failure is determined to be an engine malfunction.

[0042] In addition, the power battery includes multiple cells, each equipped with a voltage sensor, and each voltage sensor is electrically connected to the power control domain module. Specifically, each voltage sensor is electrically connected to the battery management module, and the battery management module is electrically connected to the power control domain module. Each voltage sensor can transmit the collected cell voltage to the battery management module. The power control domain module can obtain the cell voltages collected by each voltage sensor from the battery management module. The method provided in this application embodiment may further include: During the process of controlling the power battery to discharge to the engine, the power control domain module receives the cell voltage collected by each voltage sensor. If the minimum cell voltage among the received cell voltages is less than the set discharge cutoff voltage, it indicates that the power battery is low on charge. The reliability of determining that the power battery is low on charge is high by the fact that the minimum cell voltage among the received cell voltages is less than the set discharge cutoff voltage. Therefore, the power control domain module sends a stop discharge signal to the battery management module. The battery management module then controls the power battery to stop discharging to the engine.

[0043] In summary, this application provides a starting method for a range-extended electric vehicle. When preset starting conditions are met, the power control domain module can send a starting signal to the battery management module. The battery management module controls the power battery to discharge to the engine for the specified starting duration based on the starting discharge power. This eliminates the need to look up the discharge power from a preset discharge power table based on the power battery's temperature and state of charge (SOC), enabling the engine to start normally even in extremely cold conditions or when the SOC is inaccurate, thus improving the reliability of engine starting.

[0044] Please see Figure 3 This application also provides a starting device for a range-extended electric vehicle, configured in the range-extended electric vehicle. It should be noted that the starting device for the range-extended electric vehicle provided in this application has the same basic principle and technical effects as the above embodiments. For the sake of brevity, any parts not mentioned in this application's embodiments can be referred to the corresponding content in the above embodiments. As before... Figure 1 As shown, the range-extended electric vehicle includes a power control domain module, a battery management module, a power battery, and an engine. The power control domain module is electrically connected to the battery management module, the battery management module is electrically connected to the power battery, and the power battery is electrically connected to the engine. The device provided in this embodiment includes a discharge control unit and an engine control unit, wherein... The discharge control unit is used to send a start signal to the battery management module when the preset start conditions are met, so as to notify the battery management module to control the power battery to discharge to the engine based on the start discharge power and start duration. The start signal carries the start discharge power and start duration. The engine control unit is used to charge the power battery based on the engine after confirming that the engine has started successfully, until the power battery reaches a set charge threshold.

[0045] In some implementations, the discharge control unit is also configured to, upon determining that the engine has failed to start, send a start failure signal to the battery management module; and, in response to the start failure signal, control the power battery to stop discharging to the engine.

[0046] In some embodiments, the apparatus provided in this application further includes: The count recording unit is used to record the number of times the engine failed to start.

[0047] The waiting unit is used to wait for a preset time if the number of engine start failures is less than a set threshold number.

[0048] The step return unit is used to return to the step of sending a start signal to the battery management module until the number of engine start failures reaches a set threshold.

[0049] In some embodiments, the apparatus provided in this application further includes: a prompt information output unit, used to determine whether the engine has started successfully; if it is determined that the engine has not started successfully, then output a prompt information indicating that the engine has failed to start.

[0050] In some implementations, the prompt information output unit is specifically used to obtain the operating parameters of the power battery from the battery management module if it is determined that the engine has not started successfully; determine the reason for the engine starting failure based on the operating parameters of the power battery; and output a prompt information for the engine starting failure, the prompt information including the reason for the engine starting failure.

[0051] In some implementations, the prompt information output unit is specifically used to determine that the cause of engine start failure is a power battery malfunction when the operating parameters of the power battery are abnormal; and to determine that the cause of engine start failure is an engine malfunction when the operating parameters of the power battery are not abnormal.

[0052] In some embodiments, the power battery includes multiple cells, each cell is equipped with a voltage sensor, and each voltage sensor is electrically connected to the power control domain module. The device provided in this application embodiment also includes: The data receiving unit is used to receive the cell voltage collected by each voltage sensor during the process of controlling the power battery to discharge to the engine. The discharge control unit is also used to send a stop discharge signal to the battery management module when the minimum cell voltage among the received multiple cell voltages is less than the set discharge cutoff voltage, so that the battery management module controls the power battery to stop discharging to the engine.

[0053] In addition, an extended-range electric vehicle provided in this application includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it causes the extended-range electric vehicle to perform the method provided in the above embodiments of this application.

[0054] In addition, this application embodiment also provides a storage medium storing a computer program, which, when executed by a processor, causes the computer to perform the method provided in the above embodiments of this application.

[0055] In addition, this application also provides a computer program product, including a computer program that, when run, causes a range-extended electric vehicle to perform the method provided in the above embodiments of this application.

[0056] The above description does not provide detailed technical specifications regarding the structure of each layer. However, those skilled in the art should understand that layers and regions of desired shapes can be formed using various technical means. Furthermore, to form the same structure, those skilled in the art can also design methods that are not entirely identical to those described above. Additionally, although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be advantageously combined.

[0057] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0058] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A starting method for a range-extended electric vehicle, characterized in that, The method is applied to range-extended electric vehicles, wherein the range-extended electric vehicle includes a power control domain module, a battery management module, a power battery, and an engine, wherein the power control domain module is electrically connected to the battery management module, the battery management module is electrically connected to the power battery, and the power battery is electrically connected to the engine. The method includes: When the preset start-up conditions are met, the power control domain module sends a start-up signal to the battery management module, wherein the start-up signal carries the start-up discharge power and start-up duration. The battery management module controls the power battery to discharge to the engine for the start-up duration based on the start-up discharge power. After confirming that the engine has started successfully, the power control domain module charges the power battery based on the engine until the power battery reaches a set power threshold.

2. The method according to claim 1, characterized in that, After the battery management module controls the power battery to discharge to the engine for the start-up duration based on the start-up discharge power, the method further includes: After determining that the engine has failed to start, the power control domain module sends a start failure signal to the battery management module. In response to the start failure signal, the battery management module controls the power battery to stop discharging to the engine.

3. The method according to claim 2, characterized in that, After the battery management module controls the power battery to stop discharging to the engine, the method further includes: Record the number of times the engine failed to start; If the number of engine start failures is less than a set threshold, then wait for a preset time. Return to the step of sending a start signal from the power control domain module to the battery management module, until the number of engine start failures reaches a set threshold.

4. The method according to claim 3, characterized in that, After the number of engine start failures reaches a set threshold, the method further includes: The power control domain module determines whether the engine has started successfully. If it is determined that the engine has failed to start, the power control domain module outputs a prompt message indicating that the engine has failed to start.

5. The method according to claim 4, characterized in that, If it is determined that the engine failed to start, a prompt message for the engine start failure will be output, including: If it is determined that the engine has failed to start, the operating parameters of the power battery are obtained from the battery management module. Based on the operating parameters of the power battery, determine the cause of the engine start failure; Output a prompt message indicating that the engine failed to start, the prompt message including the reason for the engine starting failure.

6. The method according to claim 5, characterized in that, The step of determining the cause of the engine start failure based on the operating parameters of the power battery includes: If the operating parameters of the power battery are abnormal, the cause of the engine start failure is determined to be an abnormality in the power battery. If the operating parameters of the power battery are not abnormal, the cause of the engine start failure is determined to be an engine malfunction.

7. The method according to claim 1, characterized in that, The power battery includes multiple cells, each cell is equipped with a voltage sensor, and each voltage sensor is electrically connected to the power control domain module. The method further includes: During the process of controlling the power battery to discharge to the engine, the power control domain module receives the cell voltage collected by each of the voltage sensors; If the minimum cell voltage among the multiple cell voltages received is less than the set discharge cutoff voltage, the power control domain module sends a stop discharge signal to the battery management module. The battery management module controls the power battery to stop discharging to the engine.

8. A range-extended electric vehicle, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it causes the range-extended electric vehicle to perform the method as described in any one of claims 1 to 7.

9. A storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it causes the computer to perform the method as described in any one of claims 1 to 7.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is run, it causes the range-extended electric vehicle to perform the method as described in any one of claims 1 to 7.

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