Cruise management method and device for extended-range electric vehicle

Abstract

The invention discloses a cruise management method and device for an extended-range electric vehicle, relates to the technical field of intelligent electric vehicles, and mainly aims to realize fine management of the extended-range electric vehicle under a cruise working condition, improve the fuel efficiency and ensure the fuel economy and the endurance achievement rate. According to the main technical scheme, when the vehicle is in a hybrid control mode, the cruise working condition of the vehicle is determined according to the vehicle existence condition within a first distance in front and the road unobstructed state within a second distance in front, and the cruise working condition comprises constant-speed cruise and vehicle-following cruise; if the vehicle is cruise at a constant speed, controlling the range extender to output according to a multi-point control strategy in the cruise at the constant speed of the vehicle; if yes, the range extender is controlled to output according to a power following strategy in the vehicle following cruise process. The method is used for cruise management of the extended-range electric vehicle.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent electric vehicles, and in particular to a cruise management method and device for an extended-range electric vehicle. Background Art

[0002] As the world pays more and more attention to environmental protection and energy efficiency, new energy vehicles, especially extended-range electric vehicles (EREVs), have attracted widespread attention due to their advantages in reducing emissions and increasing driving range. The cruise function is an important function in modern automobile assisted driving systems, especially on highways and urban expressways, which can help drivers reduce driving burdens and improve driving comfort and safety. In extended-range electric vehicles, energy management in cruise mode is particularly important because it directly affects the vehicle's fuel economy, battery life, and overall performance.

[0003] At present, the cruise management of extended-range electric vehicles in the existing technology generally adopts basic cruise control strategies, such as fixed-speed cruise and simple following cruise. These strategies mainly rely on the vehicle's drive motor and battery management system. However, in the fixed-speed cruise mode, the output power of the range extender usually remains constant and cannot be flexibly adjusted according to the actual road conditions and vehicle needs. In the following cruise mode, a single power output strategy is often adopted, which makes it difficult to quickly respond to the dynamic changes of the vehicle in front. This leads to imperfect energy distribution and collaborative working strategies between the range extender and the battery, and it is impossible to achieve refined management of the cruise function, especially when the vehicle needs to enter hybrid power control due to low remaining battery power, which makes the fuel efficiency of the extended-range electric vehicle low, thereby affecting fuel economy and endurance achievement rate. Summary of the invention

[0004] In view of the above problems, the present application provides a cruise management method and device for an extended-range electric vehicle, the main purpose of which is to achieve refined management of the extended-range electric vehicle under cruise conditions, improve fuel efficiency, and ensure fuel economy and endurance achievement rate.

[0005] In order to solve the above technical problems, this application proposes the following solutions:

[0006] In a first aspect, the present application provides a cruise management method for an extended-range electric vehicle, the method comprising:

[0007] When the vehicle is in the hybrid control mode, the cruising condition of the vehicle is determined according to the presence of vehicles within a first distance ahead and the unobstructed road condition within a second distance ahead, wherein the cruising condition includes constant speed cruising and following vehicle cruising;

[0008] If it is the cruise control, the range extender is controlled to output with a multi-point control strategy during the cruise control process of the vehicle;

[0009] If it is the following vehicle cruise, the range extender is controlled to output according to the power following strategy during the following vehicle cruise.

[0010] In a second aspect, the present application provides a cruise management device for an extended-range electric vehicle, the device comprising:

[0011] a determination unit, configured to determine a cruising condition of the vehicle according to the presence of vehicles within a first distance ahead and a clear road condition within a second distance ahead when the vehicle is in a hybrid control mode, wherein the cruising condition includes a fixed speed cruise and a vehicle-following cruise;

[0012] a first control unit, configured to control the range extender to output using a multi-point control strategy during the vehicle cruise control process if the determination unit determines that the vehicle is in cruise control mode;

[0013] The second control unit is used for controlling the range extender to output with a power following strategy during the vehicle following cruise if the determining unit determines that the vehicle is in the vehicle following cruise mode.

[0014] In order to achieve the above-mentioned purpose, according to the third aspect of the present application, a storage medium is provided, which includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the cruise management method for the extended-range electric vehicle of the above-mentioned first aspect.

[0015] In order to achieve the above-mentioned purpose, according to a fourth aspect of the present application, a processor is provided, wherein the processor is used to run a program, wherein when the program is running, the cruise management method for the extended-range electric vehicle of the above-mentioned first aspect is executed.

[0016] By means of the above technical scheme, the present application provides a cruise management method and device for an extended-range electric vehicle. When it is necessary to perform cruise management on the extended-range electric vehicle, when the vehicle is in a hybrid control mode, the cruise condition of the vehicle is determined according to the existence of vehicles within a first distance directly in front and the road clearness within a second distance in front. The cruise conditions include constant speed cruise and following vehicle cruise. If it is constant speed cruise, the range extender is controlled to output with a multi-point control strategy during the vehicle's constant speed cruise. If it is following vehicle cruise, the range extender is controlled to output with a power following strategy during the vehicle's following vehicle cruise. The technical solution provided by the present application realizes intelligent working condition identification by detecting the presence of vehicles within the first distance ahead and the road clearness within the second distance. The vehicle can accurately judge and switch to the most appropriate cruise mode, i.e., cruise control or vehicle-following cruise, which improves the adaptability and intelligence level of cruise management, so that the vehicle can better adapt to different traffic environments. In the cruise control mode, the multi-point control strategy can accurately adjust the output power of the range extender to match the energy demand of the vehicle under different driving conditions, while in the vehicle-following cruise mode, the power following strategy can respond to the dynamics of the vehicle ahead in real time, adjust the output power of the range extender, and maintain a safe distance. This switching management of the cruise working condition can effectively reduce the fuel consumption caused by the frequent start-stop and long-term start-up of the range extender, improve the energy distribution and collaborative working strategy between the range extender and the battery, realize the refined management of the cruise function, improve the low fuel efficiency of the extended-range electric vehicle, and ensure the fuel economy and endurance achievement rate.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 A flow chart of a cruise management method for an extended-range electric vehicle provided in an embodiment of the present application is shown;

[0020] Figure 2 A flow chart of another cruise management method for an extended-range electric vehicle provided in an embodiment of the present application is shown;

[0021] Figure 3A block diagram showing a cruise management device for an extended-range electric vehicle provided in an embodiment of the present application is shown;

[0022] Figure 4 A block diagram of another cruise management device for an extended-range electric vehicle provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0024] At present, the cruise management of extended-range electric vehicles in the existing technology generally adopts basic cruise control strategies, such as fixed-speed cruise and simple following cruise. These strategies mainly rely on the vehicle's drive motor and battery management system. However, in the fixed-speed cruise mode, the output power of the range extender usually remains constant and cannot be flexibly adjusted according to the actual road conditions and vehicle needs. In the following cruise mode, a single power output strategy is often adopted, which makes it difficult to quickly respond to the dynamic changes of the vehicle in front. This leads to imperfect energy distribution and collaborative working strategies between the range extender and the battery, and it is impossible to achieve refined management of the cruise function, especially when the vehicle needs to enter hybrid power control due to low remaining battery power, which makes the fuel efficiency of the extended-range electric vehicle low, thereby affecting fuel economy and endurance achievement rate.

[0025] After research, the inventor found that intelligent working condition identification can be performed based on the vehicle and road conditions in front of the vehicle within the first distance and the second distance to determine the most suitable cruise condition for the vehicle, that is, cruise control or vehicle-following cruise, and set corresponding range extender working strategies for cruise control and vehicle-following cruise respectively, such as the range extender outputs with a multi-point control strategy during cruise control, and the range extender outputs with a power following strategy during vehicle-following cruise. In this way, the vehicle can accurately judge and switch to the most suitable cruise mode, improve the adaptability and intelligence level of cruise management, enable the vehicle to better adapt to different traffic environments, and effectively reduce the fuel consumption caused by frequent start-stop and long-term start-up of the range extender, improve the energy distribution and collaborative working strategy between the range extender and the battery, and realize the refined management of the cruise function, improve the low fuel efficiency of extended-range electric vehicles, and ensure fuel economy and endurance achievement rate.

[0026] Based on the above considerations, the embodiment of the present application provides a cruise management method for an extended-range electric vehicle, through which the extended-range electric vehicle can be finely managed under cruise conditions, improve fuel efficiency, and ensure fuel economy and endurance. The specific execution steps are as follows: Figure 1 As shown, including:

[0027] 101. When the vehicle is in the hybrid control mode, the cruising condition of the vehicle is determined according to the presence of vehicles within a first distance directly ahead and the road conditions within a second distance ahead.

[0028] Among them, cruising conditions include constant speed cruise and following cruise.

[0029] It should be noted that, in this embodiment, the hybrid control mode refers to the energy mode in which the vehicle needs to enter the oil-electric hybrid power control when the remaining battery power is insufficient. The corresponding energy mode is the pure electric control mode, that is, the energy mode in which the vehicle needs to enter the pure electric power control when the remaining battery power is sufficient. The judgment of whether the remaining power is sufficient usually sets a lower speed threshold for comparison and judgment, such as 30%. In addition, the switching of energy modes is also related to the driving speed of the vehicle. In actual applications, it is usually involved when driving at non-high speeds, because when driving at high speeds, the range extender is usually more efficient than the electric motor, so the preset speed threshold usually sets a higher speed threshold for comparison and judgment, such as 120KM / h.

[0030] In this step, the first distance is used to detect whether there is a vehicle in front of the vehicle. It usually refers to the farthest measurable distance of a vehicle distance sensor such as a vehicle-mounted radar or camera, such as 200 meters, or it can also refer to an effective measurable distance that can ensure measurement accuracy within the farthest measurable distance, such as 150 meters. The second distance is used to detect whether the unobstructed state of the road in front of the vehicle is blocked or unobstructed. It usually refers to the distance of the road condition predicted by intelligent devices such as the global positioning system (GPS) and the intelligent transportation system (ITS) for a period of time in the future. It can be a directly preset estimated distance, such as one kilometer in the future, or it can be calculated based on the preset estimated time (such as the next 3 minutes) and the current driving speed. After determining the first distance and the second distance, it can be detected whether there are other driving vehicles in the first distance in front and whether there is a blocked section in the road ahead in the second distance. If not, it means that the vehicle is currently suitable for the cruise control condition, and step 102 is executed at this time. If yes, it means that the vehicle is currently suitable for the cruise control condition, and step 103 is executed at this time.

[0031] 102. Control the range extender to output using a multi-point control strategy during vehicle cruise control.

[0032] In this step, since step 101 determines that the vehicle is currently suitable for the cruise control condition, that is, it is suitable to switch to the cruise control mode, it is necessary to control the range extender to output with a multi-point control strategy during the vehicle cruise control process. Specifically, a pre-calibrated working point table is obtained, and the optimal working point (speed and torque) of the range extender is pre-calibrated according to the current driving speed and load conditions of the vehicle. The working point table can be a two-dimensional or multi-dimensional table, the input is the vehicle speed and load, and the output is the optimal speed and torque of the range extender. Specifically, the current vehicle speed is obtained through the vehicle speed sensor, the current load is comprehensively judged by parameters such as the accelerator pedal position and the battery SOC, and the corresponding optimal working point is found in the pre-calibrated working point table. If an exact matching working point is not found, the nearest point can be selected as the optimal working point. The range extender is controlled to output according to the optimal working point found. By adjusting the throttle opening, fuel injection amount and other parameters of the range extender, the range extender is operated at the optimal speed and torque.

[0033] By controlling the range extender to output with the above-mentioned multi-point control strategy under the cruise control condition, the fuel waste caused by the frequent start and stop of the range extender can be effectively reduced and the fuel utilization efficiency can be improved.

[0034] 103. Control the range extender to output with a power following strategy during the vehicle following cruise.

[0035] In this step, since step 101 determines that the vehicle is currently suitable for the following cruise condition, that is, suitable for switching to the following cruise mode, it is necessary to control the range extender to output with a power following strategy during the vehicle following cruise. Specifically, the vehicle required power can be determined first, and the vehicle required power includes but is not limited to the wheel end required power, thermal management required power, accessory required power and power battery compensation required power, etc., and then the actual output power and maximum output power of the range extender are obtained, and the maximum output power of the range extender is compared with the vehicle required power to determine whether the range extender is capable of meeting the vehicle power demand. If the maximum output power of the range extender is greater than or equal to the vehicle required power, it means that the range extender alone can meet the vehicle power demand. At this time, the range extender can be controlled to output according to the actual output power. If the maximum output power of the range extender is less than the vehicle required power, it means that the range extender alone cannot meet the vehicle power demand. In other words, there is a gap in the vehicle power demand, and it is necessary to obtain output power from the battery to supplement it. That is, the vehicle power demand is dynamically met by the maximum output power of the range extender and the supplementary output power provided by the battery. Monitor the actual output power of the range extender and battery in real time. If the actual output deviates from the expected output, make appropriate adjustments to ensure stable operation and optimize energy efficiency.

[0036] By controlling the range extender to output with the above-mentioned power following strategy under the vehicle-following cruising condition, the fuel consumption caused by the long-term startup of the range extender can be reduced and the fuel utilization efficiency can be improved.

[0037] Based on the above Figure 1 It can be seen from the implementation method that, through the above technical scheme, a cruise management method for an extended-range electric vehicle provided in the present application is that when it is necessary to perform cruise management on the extended-range electric vehicle, when the vehicle is in a hybrid control mode, the cruise condition of the vehicle is determined according to the existence of vehicles within a first distance directly in front and the smoothness of the road within a second distance in front, and the cruise condition includes constant speed cruise and following cruise. If it is constant speed cruise, the range extender is controlled to output with a multi-point control strategy during the vehicle's constant speed cruise process. If it is following cruise, the range extender is controlled to output with a power following strategy during the vehicle's following cruise process. The technical solution provided by the present application realizes intelligent working condition identification by detecting the presence of vehicles within the first distance ahead and the road clearness within the second distance. The vehicle can accurately judge and switch to the most appropriate cruise mode, i.e., cruise control or vehicle-following cruise, which improves the adaptability and intelligence level of cruise management, so that the vehicle can better adapt to different traffic environments. In the cruise control mode, the multi-point control strategy can accurately adjust the output power of the range extender to match the energy demand of the vehicle under different driving conditions, while in the vehicle-following cruise mode, the power following strategy can respond to the dynamics of the vehicle ahead in real time, adjust the output power of the range extender, and maintain a safe distance. This switching management of the cruise working condition can effectively reduce the fuel consumption caused by the frequent start-stop and long-term start-up of the range extender, improve the energy distribution and collaborative working strategy between the range extender and the battery, realize the refined management of the cruise function, improve the low fuel efficiency of the extended-range electric vehicle, and ensure the fuel economy and endurance achievement rate.

[0038] Further, the preferred embodiment of the present application is in the above Figure 1 Based on this, a detailed description of the cruise management process for extended-range electric vehicles is provided. The specific steps are as follows: Figure 2 As shown, including:

[0039] 201. Determine whether the driving speed of the vehicle is less than a preset speed threshold.

[0040] It should be noted that because the range extender is usually more efficient than the electric motor under high-speed conditions (for example, exceeding 120km / h), based on considerations such as high-speed driving energy efficiency and cruising range optimization, the preset speed threshold is usually set to a threshold that can determine high-speed conditions and low-speed conditions, such as 120km / h.

[0041] In this step, the real-time driving speed of the vehicle is obtained through the vehicle speed sensor, which may be a wheel speed sensor, GPS or other vehicle-mounted speed measuring device. The real-time driving speed is compared with the preset speed threshold. If the driving speed is greater than or equal to the preset speed threshold, it means that the vehicle is currently driving at high speed. In order to improve fuel economy and avoid the motor's efficiency being reduced due to increased power loss when driving at high speed, step 206 is executed at this time. If the driving speed is less than the preset speed threshold, it means that the vehicle is currently driving at low speed, and it is necessary to further determine the remaining power of the power battery to decide whether to enter the pure electric control mode or the hybrid control mode. At this time, step 202 is executed.

[0042] It should be noted that the preset speed threshold can also be customized according to the design and performance requirements of the vehicle. It is only necessary to ensure that the energy efficiency and emission characteristics of the vehicle when driving at low speeds, as well as the efficiency of battery use, are taken into account.

[0043] 202. When the remaining power of the power battery is greater than or equal to the preset power threshold, the pure electric control mode is entered; when the remaining power of the power battery is less than the preset power threshold, the hybrid control mode is entered.

[0044] In this step, the preset power threshold can be customized according to the design and performance requirements of the vehicle, and is set by considering the health of the power battery, the mileage requirements, and the driver's usage habits, for example, 30% or 40%. The remaining power (State of Charge, SOC) of the power battery is obtained through the battery management system (BMS), and the obtained real-time remaining power is compared with the preset power threshold. If the remaining power of the power battery is greater than or equal to the preset power threshold, it means that the battery power is sufficient at this time, and it is more economical to rely on the power battery to supply the power demand of the whole vehicle, so the vehicle is controlled to enter the pure electric control mode at this time.

[0045] If the remaining power of the power battery is less than the preset power threshold, it means that the battery power is insufficient at this time, then it is necessary to rely on the range extender to supply the power demand of the whole vehicle. If the power demand of the whole vehicle cannot be met, relying on the power battery to supplement it is more economical and has higher endurance achievement rate. Therefore, the vehicle is controlled to enter the hybrid control mode at this time.

[0046] In pure electric control mode, the vehicle relies solely on battery power to drive the motor, and the range extender does not work, thus achieving zero emissions, low noise and high energy efficiency, which is particularly suitable for low-speed driving and short-distance driving in cities. Specific operation: turn off the range extender, monitor the battery status through the battery management system (BMS), ensure that the battery operates within a safe range, and the motor outputs power according to the driver's needs.

[0047] In the hybrid control mode, the vehicle uses the battery and the range extender to power the motor at the same time. The range extender can be started as needed to charge the battery or directly drive the motor, thereby extending the cruising range and improving fuel economy. Specifically, the range extender is started, and the output power of the range extender and the battery is dynamically adjusted according to the power demand and battery status of the vehicle. A multi-point control strategy or a power following strategy is adopted to optimize the operating point of the range extender and improve the overall energy efficiency. The battery status is monitored through the battery management system (BMS) to ensure that the battery operates within a safe range.

[0048] By flexibly selecting the most appropriate control mode under different driving speeds and battery power conditions, fuel efficiency can be effectively improved, ensuring fuel economy and range achievement rate. Specifically, when driving at low speeds, if the battery power is sufficient, it enters the pure electric control mode to achieve zero emissions and high energy efficiency. If the battery power is insufficient, it enters the hybrid control mode to extend the range and improve fuel economy. When driving at high speeds, the range extender is directly controlled to output with a multi-point control strategy, optimizing the working point of the range extender and improving fuel economy. It not only takes into account the actual driving conditions of the vehicle, but also makes full use of the advantages of the battery and the range extender to achieve refined energy management.

[0049] 203. When the vehicle is in the hybrid control mode, the cruising condition of the vehicle is determined according to the presence of vehicles within a first distance directly ahead and the smoothness of the road within a second distance ahead.

[0050] This step is combined with the description of step 101 in the above method, and the same content is not repeated here. It should be noted that the specific determination process of the first distance and the second distance is: taking the farthest measurable distance of the vehicle distance sensor as the first distance; taking the preset estimated distance as the second distance, and / or calculating the second distance according to the preset estimated duration and the current vehicle speed.

[0051] By taking the longest measurable distance as the first distance and setting a second distance greater than the first distance, the accuracy and rationality of the subsequent determination of the cruise condition can be guaranteed to the maximum extent, avoiding frequent switching of the vehicle's cruise condition, and improving the driving experience and driving safety.

[0052] It should also be noted that, based on the first distance and the second distance determined above, the specific execution process of determining the cruising condition of the vehicle according to the presence of vehicles within the first distance directly in front and the smoothness of the road within the second distance in front is: detecting whether there are other moving vehicles within the first distance directly in front of the vehicle, and estimating whether there is a blocked section on the road in front of the vehicle within the second distance; if so, determining that the cruising condition is following cruise; if not, determining that the cruising condition is constant speed cruise.

[0053] By detecting the presence of vehicles within a first distance ahead and the road conditions within a second distance to achieve intelligent operating condition recognition, the vehicle can accurately judge and switch to the most appropriate cruise mode, improving the adaptability and intelligence level of cruise management, allowing the vehicle to better adapt to different traffic environments and improve fuel efficiency.

[0054] 204. Control the range extender to output using a multi-point control strategy during the vehicle's cruise control process.

[0055] This step is combined with the description of step 102 in the above method, and the same contents are not repeated here.

[0056] 205. Control the range extender to output with a power following strategy during the vehicle following cruise.

[0057] This step is combined with the description of step 103 in the above method, and the same content will not be repeated here. It should be noted that the specific execution process of controlling the range extender to output with a power following strategy during the vehicle following cruise is: calculating the vehicle required power based on the vehicle's wheel-end required power, thermal management required power, accessory required power and power battery compensation required power; obtaining the actual output power of the range extender and the maximum output power of the range extender; if the maximum output power of the range extender is greater than or equal to the vehicle required power, then controlling the range extender to output according to the actual output power of the range extender during the vehicle following cruise; if the maximum output power of the range extender is less than the vehicle required power, then controlling the range extender to output according to the sum of the maximum output power of the range extender and the supplementary output power of the power battery during the vehicle following cruise.

[0058] Based on the above specific execution process of controlling the range extender to output with the power following strategy during the vehicle following cruise, it can be known that the output power of the range extender changes in real time with the power demand of the vehicle, and the specific relationship expression is:

[0059]

[0060] Among them, P req P is the required power of the vehicle; APU is the output power of the range extender; P APUmax is the maximum output power of the range extender, P bat_rep To supplement the output power of the power battery.

[0061] In this step, the vehicle power requirement P req Including but not limited to wheel end required power P d , Thermal management required power P a 、Accessory power requirement P f And the compensation power required by the power battery P soc Etc. Among them, the wheel end power demand Pd Based on the vehicle's speed and acceleration, the thermal management power requirement P a The accessory power requirement P is determined based on the ambient temperature and vehicle status (such as whether the air conditioner is turned on). f Determined according to the electrical equipment currently in use, the compensation power required by the power battery P soc According to the battery status information (such as SOC, temperature, etc.) provided by the battery management system (BMS), it is determined whether the battery needs to be charged or discharged. The compensation required power P soc It can be a positive number (indicating that charging is required) or a negative number (indicating that discharge is possible). The specific determination process is: obtain the wheel-end power demand, thermal management power demand, accessory power demand, and compensation power demand respectively; add the wheel-end power demand, thermal management power demand, accessory power demand, and compensation power demand to obtain the vehicle power demand. At the same time, the actual output power P of the current range extender is obtained through the range extender's sensors (such as speed sensors, torque sensors, etc.). APU , the actual output power P APU It can be obtained through real-time monitoring of the working status and control parameters of the range extender, and the maximum output power P of the range extender APUmax It is determined by the vehicle's driving speed and the pre-calibrated maximum output power table, that is, by obtaining and querying the pre-calibrated operating point table, the pre-calibrated optimal operating point (speed and torque) of the range extender is determined according to the vehicle's current driving speed and load conditions.

[0062] Compare the maximum output power of the range extender with the required power of the vehicle. If P APUmax ≥P req , then the range extender is controlled according to P APU Output is made by adjusting the throttle opening, fuel injection amount and other parameters of the range extender to ensure that the range extender operates at the required power. APUmax <P req , then the range extender is controlled according to P APUmax +P bat_rep Output is performed, that is, the sum of the maximum output power of the range extender and the supplementary output power of the power battery is output. Specifically, the throttle opening, fuel injection amount and other parameters of the range extender are adjusted to ensure that the range extender operates at the maximum output power. At the same time, the charge and discharge current of the power battery is adjusted through the battery management system (BMS) to ensure that the power battery operates within a safe range.

[0063] Since the size of the supplementary output power of the power battery is not only related to the difference between the vehicle's required power and the range extender's maximum output power, but also subject to its own maximum output power limit, the specific determination process of controlling the range extender to output according to the sum of the range extender's maximum output power and the supplementary output power of the power battery during the vehicle's cruising is as follows: subtract the range extender's maximum output power from the vehicle's required power to obtain the required output power of the power battery; if the required output power of the power battery is less than the maximum output power of the power battery, the required output power of the power battery is used as the supplementary output power of the power battery; if the required output power of the power battery is greater than or equal to the maximum output power of the power battery, the maximum output power of the power battery is used as the supplementary output power of the power battery; control the range extender to output according to the range extender's maximum output power during the vehicle's cruising, and control the power battery to output according to the supplementary output power.

[0064] In this step, the required output power P of the power battery is calculated. bat_rep , that is, the maximum output power P of the range extender APUmax and the vehicle power requirement P req The required output power P bat_rep The maximum output power P of the power battery bat_max For comparison, if P bat_rep <P bat_max , then the range extender is controlled according to the maximum output power P of the range extender APUmax While outputting, control the power battery to P bat_rep Output, if P bat_rep ≥P bat_max , in controlling the range extender according to the maximum output power P of the range extender APUmax While outputting, control the power battery to P bat_max Output.

[0065] By comprehensively considering the wheel-end power demand, thermal management power demand, accessory power demand and battery compensation power demand, the total power demand of the vehicle is calculated and compared with the maximum output power of the range extender. The output strategy of the range extender and the battery is determined based on the comparison result, that is, when the maximum output power of the range extender is greater than or equal to the vehicle power demand, the range extender is controlled to output according to the power demand; when the maximum output power of the range extender is less than the vehicle power demand, the range extender is controlled to output according to the maximum output power, and the battery supplements the remaining power. This not only improves the accuracy of energy management, but also ensures the driving experience.

[0066] 206. Control the range extender to output using a multi-point control strategy.

[0067] This step is combined with the description of the multi-point control strategy in step 102 of the above method, and the same contents are not repeated here.

[0068] Furthermore, as a response to the above Figure 1-2 The implementation of the method embodiment shown in the figure, the embodiment of the present application provides a cruise management device for an extended-range electric vehicle, which is used to achieve refined management of the extended-range electric vehicle under cruising conditions, improve fuel efficiency, and ensure fuel economy and endurance. The embodiment of the device corresponds to the aforementioned method embodiment. For ease of reading, this embodiment will no longer repeat the details of the aforementioned method embodiment one by one, but it should be clear that the device in this embodiment can correspond to all the contents of the aforementioned method embodiment. Specifically, Figure 3 As shown, the device comprises:

[0069] a determination unit 31, configured to determine a cruising condition of the vehicle according to the presence of vehicles within a first distance ahead and a clear road condition within a second distance ahead when the vehicle is in a hybrid control mode, wherein the cruising condition includes a constant speed cruise and a following cruise;

[0070] A first control unit 32 is configured to control the range extender to output using a multi-point control strategy during the vehicle cruise control process if the determination unit 31 determines that the vehicle is in cruise control mode;

[0071] The second control unit 33 is configured to control the range extender to output power in a power following strategy during the vehicle following cruise if the determination unit 31 determines that the vehicle is in the vehicle following cruise mode.

[0072] Further, such as Figure 4 As shown, the device also includes:

[0073] An acquiring unit 34 is configured to use the longest measurable distance of the vehicle distance sensor as the first distance before the determining unit 31;

[0074] The calculation unit 35 is used to use a preset estimated distance as the second distance, and / or calculate the second distance according to a preset estimated duration and a current vehicle speed, and the second distance is greater than the first distance.

[0075] Further, such as Figure 4 As shown, the determining unit 31 includes:

[0076] A detection module 311 is used to detect whether there are other vehicles in front of the vehicle within the first distance, and to estimate whether there is a blocked section on the road in front of the vehicle within the second distance;

[0077] A first determination module 312 is configured to determine that the cruising condition is the following cruise if the detection module 311 detects that there are other vehicles in front within the first distance or there is a blocked section on the road ahead within the second distance;

[0078] The second determination module 313 is used to determine that the cruising condition is the constant speed cruise if the detection module 311 detects that there are no other vehicles in front within the first distance and there is no blocked section on the road ahead within the second distance.

[0079] Further, such as Figure 4 As shown, the second control unit 33 includes:

[0080] A calculation module 331 is used to calculate the vehicle power requirement based on the vehicle's wheel-end power requirement, thermal management power requirement, accessory power requirement, and power battery compensation power requirement;

[0081] An acquisition module 332 is used to acquire the actual output power of the range extender and the maximum output power of the range extender;

[0082] A control module 333, configured to control the range extender to output according to the actual output power of the range extender during the vehicle following cruise if the maximum output power of the range extender obtained by the acquisition module 332 is greater than or equal to the vehicle required power obtained by the calculation module 331;

[0083] The control module 333 is further used to control the range extender to output power according to the sum of the maximum output power of the range extender and the supplementary output power of the power battery during the vehicle following cruise if the maximum output power of the range extender obtained by the acquisition module 332 is less than the vehicle required power obtained by the calculation module 331.

[0084] Further, such as Figure 4 As shown, the control module 333 is specifically used for:

[0085] Subtract the maximum output power of the range extender from the required power of the vehicle to obtain the required output power of the power battery;

[0086] If the required output power of the power battery is less than the maximum output power of the power battery, the required output power of the power battery is used as the supplementary output power of the power battery;

[0087] If the required output power of the power battery is greater than or equal to the maximum output power of the power battery, the maximum output power of the power battery is used as the supplementary output power of the power battery;

[0088] The range extender is controlled to output according to the maximum output power of the range extender during the vehicle following cruise, and the power battery is controlled to output according to the supplementary output power.

[0089] Further, such as Figure 4 As shown, the calculation module 331 is specifically used for:

[0090] Respectively obtaining the wheel end required power, the thermal management required power, the accessory required power and the compensation required power;

[0091] The wheel-end power requirement, the thermal management power requirement, the accessory power requirement and the compensation power requirement are added together to obtain the vehicle power requirement.

[0092] Further, such as Figure 4 As shown, the device also includes:

[0093] A judging unit 36, used for judging whether the driving speed of the vehicle is less than a preset speed threshold before the determining unit 31;

[0094] The processing unit 37 is configured to, if the judging unit 36 ​​judges that the driving speed of the vehicle is less than a preset speed threshold, enter the pure electric control mode when the remaining power of the power battery is greater than or equal to the preset power threshold, and enter the hybrid control mode when the remaining power of the power battery is less than the preset power threshold;

[0095] The third control unit 38 is configured to control the range extender to output according to the multi-point control strategy if the judgment unit 36 ​​judges that the driving speed of the vehicle is not less than a preset speed threshold.

[0096] Furthermore, an embodiment of the present application further provides a storage medium, wherein the storage medium is used to store a computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the above Figure 1-2 The cruise management method for the extended-range electric vehicle described in.

[0097] Furthermore, the embodiment of the present application also provides a processor, the processor is used to run a program, wherein the program executes the above Figure 1-2 The cruise management method for the extended-range electric vehicle described in.

[0098] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0099] It is understandable that the related features in the above methods and devices can be referenced to each other. In addition, the "first", "second" and the like in the above embodiments are used to distinguish the embodiments, but do not represent the advantages and disadvantages of the embodiments.

[0100] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0101] The algorithm and display provided herein are not inherently related to any particular computer, virtual system or other device. Various general purpose systems can also be used together with the teachings based on this. According to the above description, it is obvious that the structure required for constructing such systems. In addition, the application is not directed to any specific programming language either. It should be understood that various programming languages ​​can be utilized to realize the content of the application described herein, and the description of the specific language above is for the purpose of disclosing the best mode of implementation of the application.

[0102] In addition, the memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0103] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0104] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0105] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0106] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0107] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0108] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0109] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include transitory media such as modulated data signals and carrier waves.

[0110] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0111] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0112] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A cruise management method for an extended-range electric vehicle, characterized in that: The method comprises: When the vehicle is in the hybrid control mode, the cruising condition of the vehicle is determined according to the presence of vehicles within a first distance ahead and the unobstructed road condition within a second distance ahead, wherein the cruising condition includes constant speed cruising and following vehicle cruising; If it is the cruise control, the range extender is controlled to output with a multi-point control strategy during the cruise control process of the vehicle; If it is the following vehicle cruise, the range extender is controlled to output according to the power following strategy during the following vehicle cruise.

2. The method according to claim 1, characterized in that: Before determining the cruising condition of the vehicle according to the presence of vehicles within the first distance ahead and the unobstructed road condition within the second distance ahead, the method further includes: The longest measurable distance of the vehicle distance sensor is taken as the first distance; A preset estimated distance is used as the second distance, and / or the second distance is calculated according to a preset estimated duration and a current vehicle speed, and the second distance is greater than the first distance.

3. The method according to claim 2, characterized in that The cruising condition of the vehicle is determined according to the presence of vehicles within a first distance ahead and the unobstructed road condition within a second distance ahead, including: Detecting whether there are other vehicles in front of the vehicle within the first distance, and estimating whether there is a blocked section on the road in front of the vehicle within the second distance; If yes, determining that the cruising condition is the following vehicle cruising; If not, it is determined that the cruise operating condition is the constant speed cruise.

4. The method according to claim 1, characterized in that Control the range extender to output with a power following strategy during vehicle following cruise, including: Calculate the vehicle power requirement based on the vehicle's wheel-end power requirement, thermal management power requirement, accessory power requirement, and power battery compensation power requirement; Obtain the actual output power and maximum output power of the range extender; If the maximum output power of the range extender is greater than or equal to the required power of the whole vehicle, the range extender is controlled to output according to the actual output power of the range extender during the vehicle following cruise; If the maximum output power of the range extender is less than the required power of the whole vehicle, the range extender is controlled to output power according to the sum of the maximum output power of the range extender and the supplementary output power of the power battery during the vehicle following cruise.

5. The method according to claim 4, characterized in that Controlling the range extender to output power according to the sum of the maximum output power of the range extender and the supplementary output power of the power battery during the vehicle following cruise, including: Subtract the maximum output power of the range extender from the required power of the vehicle to obtain the required output power of the power battery; If the required output power of the power battery is less than the maximum output power of the power battery, the required output power of the power battery is used as the supplementary output power of the power battery; If the required output power of the power battery is greater than or equal to the maximum output power of the power battery, the maximum output power of the power battery is used as the supplementary output power of the power battery; The range extender is controlled to output according to the maximum output power of the range extender during the vehicle following cruise, and the power battery is controlled to output according to the supplementary output power.

6. The method according to claim 4, characterized in that The vehicle power requirement is calculated based on the vehicle's wheel-end power requirement, thermal management power requirement, accessory power requirement, and power battery compensation power requirement, including: Respectively obtaining the wheel end required power, the thermal management required power, the accessory required power and the compensation required power; The wheel-end power requirement, the thermal management power requirement, the accessory power requirement and the compensation power requirement are added together to obtain the vehicle power requirement.

7. The method according to any one of claims 1 to 6, characterized in that When the vehicle is in the hybrid control mode, before determining the cruising condition of the vehicle according to the presence of vehicles within a first distance ahead and the unobstructed road condition within a second distance ahead, the method further includes: Determine whether the vehicle's driving speed is less than a preset speed threshold; If so, the pure electric control mode is entered when the remaining power of the power battery is greater than or equal to the preset power threshold, and the hybrid control mode is entered when the remaining power of the power battery is less than the preset power threshold; If not, the range extender is controlled to output using the multi-point control strategy.

8. A cruise management device for an extended-range electric vehicle, characterized in that: The device comprises: a determination unit, configured to determine a cruising condition of the vehicle according to the presence of vehicles within a first distance ahead and a clear road condition within a second distance ahead when the vehicle is in a hybrid control mode, wherein the cruising condition includes a fixed speed cruise and a vehicle-following cruise; a first control unit, configured to control the range extender to output using a multi-point control strategy during the vehicle cruise control process if the determination unit determines that the vehicle is in cruise control mode; The second control unit is used for controlling the range extender to output with a power following strategy during the vehicle following cruise if the determining unit determines that the vehicle is in the vehicle following cruise mode.

9. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the cruise management method for the extended-range electric vehicle as described in any one of claims 1 to 7.

10. A processor, characterized in that: The processor is used to run a program, wherein the program, when running, executes the cruise management method for an extended-range electric vehicle as described in any one of claims 1 to 7.

Images