Energy-saving control method and system for extended-range vehicle and extended-range vehicle

Abstract

The application discloses a kind of energy-saving control method and system of range extending vehicle and range extending vehicle, it includes: calculating the current comprehensive range of range extending vehicle, and judge whether to receive the instruction of opening energy-saving mode;If the current comprehensive range of range extending vehicle is less than the preset mileage threshold, then send the confirmation prompt whether to open energy-saving mode;If receiving the instruction of confirming opening energy-saving mode or receiving the instruction of opening energy-saving mode, then enter energy-saving mode, execute the vehicle energy-saving control strategy that has been selected.The vehicle energy-saving control strategy that has been selected is at least one strategy in the following strategies: drive motor control adjustment strategy, energy recovery control adjustment strategy, vehicle speed control adjustment strategy, intelligent driving control adjustment strategy, vehicle-mounted accessory control adjustment strategy and range extender control adjustment strategy.The application can improve the range of range extending vehicle, reduce the risk of range extending vehicle, reduce power consumption and fuel consumption, and make the trip of range extending vehicle more economical.

Description

Technical Field

[0001] This invention belongs to the field of vehicle energy-saving control, specifically relating to an energy-saving control method, system, and range-extended vehicle for range-extended vehicles. Background Technology

[0002] Range-extended vehicles are hybrid electric vehicles that generate electricity while driving by controlling the range extender to consume fuel, thus replenishing the battery. When the remaining battery power and fuel level are low, there is a risk that the remaining energy may not be enough to reach a charging or refueling station, causing the vehicle to break down. Furthermore, some range-extended vehicle users hope to minimize both electricity and fuel consumption during driving to reduce operating costs and extend the combined driving range (pure electric and fuel).

[0003] Currently, some electric vehicles have an energy-saving mode that enters when the battery charge is low. This mode reduces energy consumption by limiting vehicle speed, limiting drive torque, and increasing energy recovery intensity. However, this mode is designed for pure electric vehicles and does not address the fuel consumption issues that range-extended vehicles need to consider. Furthermore, its design of increasing energy recovery intensity regardless of actual driving conditions can sometimes lead to even greater energy loss. Therefore, how to effectively control energy consumption in range-extended vehicles is an urgent problem that needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide an energy-saving control method, system, and vehicle for range-extended vehicles, so as to increase the driving range of range-extended vehicles, reduce the risk of breakdowns, and reduce power and fuel consumption, making travel more economical.

[0005] In a first aspect, the present invention provides an energy-saving control method for range-extended vehicles, comprising:

[0006] Calculate the current combined driving range of the range-extended vehicle and determine whether a command to activate the energy-saving mode has been received.

[0007] If the current combined driving range of the range-extended vehicle is less than the preset mileage threshold, a confirmation prompt will be issued asking whether to activate the energy-saving mode.

[0008] If a confirmation command to activate energy-saving mode is received, or a command to open energy-saving mode is received, the vehicle enters energy-saving mode and executes the selected vehicle energy-saving control strategy. The selected vehicle energy-saving control strategy includes at least one of the following: drive motor control adjustment strategy, energy recovery control adjustment strategy, vehicle speed control adjustment strategy, intelligent driving control adjustment strategy, and on-board accessory control adjustment strategy, as well as a range extender control adjustment strategy. The total vehicle energy-saving control strategy includes: range extender control adjustment strategy, drive motor control adjustment strategy, energy recovery control adjustment strategy, vehicle speed control adjustment strategy, intelligent driving control adjustment strategy, and on-board accessory control adjustment strategy. The range extender control adjustment strategy is mandatory; at least one of the remaining five strategies must be selected, and two, three, four, or five strategies can also be selected.

[0009] Preferably, the method for calculating the current combined driving range of a range-extended vehicle is as follows:

[0010] Using the formula: S 电 =SOC0*E 电 / C 电 Calculate the pure electric driving range S of the range-extended vehicle. 电 (Unit: km). Where SOC0 represents the current battery SOC value, E 电 C represents the total energy of the power battery (unit: kWh). 电 This indicates the preset energy consumption per unit distance (unit: kWh / km); SOC0*E 电 This indicates the remaining energy of the power battery (unit: kWh).

[0011] Using the formula: S 油 =V 油 / C 油 Calculate the fuel-powered driving range S of the range-extended vehicle. 油 (Unit: km). Wherein, V 油 This indicates the current remaining fuel level in the vehicle (unit: L), C 油 This indicates the preset fuel consumption per unit distance (unit: L / km).

[0012] Using the formula: S 总 =S 电 +S 油 The current combined driving range S of the range-extended vehicle is calculated. 总 (Unit: km)

[0013] Preferably, the range extender control and regulation strategy includes a range extender start-stop control strategy and a range extender target power generation control strategy.

[0014] The range extender start-stop control strategy is as follows: if the range extender is in a stopped state, it starts generating electricity when the current battery SOC value is less than a preset first SOC threshold; if the range extender is in a working state, it stops operating when the current battery SOC value is greater than a preset second SOC threshold. The preset second SOC threshold is greater than the preset first SOC threshold. This start-stop control strategy only uses the current battery SOC value as the criterion, eliminating the influence of vehicle speed. This simplifies the control logic, reduces the repeated start-stop issues that might occur during short-distance driving due to vehicle speed fluctuations, and helps extend the range extender's lifespan, improve power generation efficiency, and reduce energy conversion losses.

[0015] The target power generation control strategy for the range extender is as follows: After the range extender starts, a preset target power generation table is consulted based on the current vehicle speed to obtain the corresponding target power generation; the range extender is then controlled to operate according to this target power generation. The preset target power generation table is a table calibrated to determine the correspondence between vehicle speed ranges and target power generation, taking fuel economy into consideration. When the energy-saving mode is not activated, because passengers in range-extended vehicles have certain requirements for NVH performance during driving, and the range extender noise is positively correlated with the range extender power generation, the range extender power is limited at different vehicle speeds. When the energy-saving mode is not activated, the target power output of the range extender is the minimum of the baseline target power output value and the power limit value of the range extender at the same vehicle speed. The baseline target power output value is obtained by consulting a preset target power output value table based on the vehicle speed range and battery SOC value range. The power limit value is obtained by consulting a preset power limit value table based on the vehicle speed range. In this mode, the target power output of the range extender corresponds to good NVH performance, but poor fuel economy. After activating the energy-saving mode, the target power output of the range extender is not constrained by NVH performance, but mainly considers fuel economy, thereby reducing fuel consumption and making range-extended vehicles more economical to travel, while also simplifying the control logic.

[0016] Preferably, the drive motor control and adjustment strategy includes a drive torque limiting strategy and a drive torque change rate limiting strategy.

[0017] The drive torque limiting strategy reduces the output torque of the drive motor (i.e., drive torque), and there are two main ways to achieve this. The first method involves: querying a preset drive torque limiting table based on the current vehicle speed and accelerator pedal opening to obtain the corresponding drive torque; and using this corresponding drive torque as the current drive torque. The preset drive torque limiting table is a table of correspondence between vehicle speed, accelerator pedal opening, and drive torque obtained through calibration. Compared to a preset unrestricted drive torque table, this preset limit table shows a smaller drive torque at the same vehicle speed and accelerator pedal opening. The preset unrestricted drive torque table is also a table of correspondence between vehicle speed, accelerator pedal opening, and drive torque obtained through calibration. The second method involves: querying a preset unrestricted drive torque table based on the current vehicle speed and accelerator pedal opening to obtain the corresponding (unrestricted) drive torque; and using the product of this (unrestricted) drive torque and f as the current drive torque; where f represents a preset torque limiting coefficient, 0. <f<1。

[0018] The drive torque change rate limiting strategy is to reduce the maximum value of the drive motor output torque change rate (i.e., the maximum drive torque change rate, also known as the drive torque change rate limit). This is achieved by: querying a preset maximum drive torque change rate limit table based on the current vehicle speed and current drive torque to obtain the corresponding maximum drive torque change rate; using this corresponding maximum drive torque change rate as the current maximum drive torque change rate. The preset maximum drive torque change rate limit table is a table of correspondence between vehicle speed, drive torque, and the maximum drive torque change rate obtained through calibration. Compared to a preset table of maximum drive torque change rate without limitation, this preset maximum drive torque change rate limit table results in a smaller maximum drive torque change rate at the same vehicle speed and drive torque. The preset table of maximum drive torque change rate without limitation is also a table of correspondence between vehicle speed, drive torque, and the maximum drive torque change rate obtained through calibration.

[0019] Preferably, the energy recovery control and regulation strategy is as follows:

[0020] Determine whether the current route of the range-extended vehicle is a highway or expressway.

[0021] If so, the corresponding energy recovery torque is obtained by consulting the preset energy recovery torque table I based on the current vehicle speed and current accelerator pedal opening. This corresponding energy recovery torque is then used as the current energy recovery torque. The preset energy recovery torque table I is a table of correspondence between vehicle speed, accelerator pedal opening, and energy recovery torque obtained through calibration. Compared to the preset unadjusted energy recovery torque table, the preset energy recovery torque table I shows a smaller energy recovery torque at the same vehicle speed and accelerator pedal opening. The preset unadjusted energy recovery torque table is a table of correspondence between vehicle speed, accelerator pedal opening, and energy recovery torque obtained through calibration. When the extended-range vehicle is traveling on highways or expressways, the vehicle speed is relatively high and stable, with less need for deceleration. If the energy recovery intensity (i.e., the energy recovery torque) is increased in this scenario, the vehicle speed will decrease rapidly when the user releases the accelerator pedal. Subsequently, if the user wishes to maintain the original speed, they need to depress the accelerator pedal more forcefully. This behavior will cause the kinetic energy of the extended-range vehicle to be converted into electrical energy through energy recovery, and then into kinetic energy through the drive motor. This process will be affected by the charging and discharging efficiency of the power battery. Therefore, in this scenario, the energy recovery intensity needs to be reduced (i.e., the energy recovery torque needs to be reduced). After the user releases the accelerator pedal, the vehicle can coast naturally. When the user needs to decelerate, the vehicle can brake by pressing the brake pedal, thus avoiding energy loss caused by repeated energy recovery and drive motor output in the range-extended vehicle.

[0022] If not, the system queries the preset energy recovery torque table II based on the current vehicle speed and accelerator pedal opening to obtain the corresponding energy recovery torque; this corresponding energy recovery torque is then used as the current energy recovery torque. The preset energy recovery torque table II is a calibrated table showing the correspondence between vehicle speed, accelerator pedal opening, and energy recovery torque. Compared to the preset unadjusted energy recovery torque table, this preset table II provides a higher energy recovery torque at the same vehicle speed and accelerator pedal opening. When the vehicle is not traveling on highways or expressways, but on urban roads, mountain roads, etc., the range-extended vehicle experiences frequent acceleration and deceleration. In this scenario, increasing the energy recovery intensity (i.e., increasing the energy recovery torque) can maximize the conversion of the range-extended vehicle's kinetic energy into electrical energy, thereby increasing the pure electric driving range.

[0023] Preferably, the vehicle speed control adjustment strategy is as follows:

[0024] Based on the current vehicle speed minus the preset speed limit value V lim The difference is used to query the preset drive torque limit ratio table to obtain the corresponding drive torque limit ratio f. lim The preset drive torque limit ratio table is obtained through calibration by subtracting V from the vehicle speed. lim A table showing the correspondence between the difference and the driving torque limit ratio; a table of preset driving torque limit ratios: vehicle speed decreases by V. limWhen the difference is less than or equal to the preset first speed threshold, the drive torque limit ratio is 1, and the vehicle speed decreases by V. lim When the difference is greater than or equal to the preset second speed threshold, the drive torque limit ratio is 0; the vehicle speed decreases by V. lim When the difference is greater than a preset first speed threshold and less than a preset second speed threshold, the drive torque limiting ratio decreases between 1 and 0 as the vehicle speed decreases. lim The difference decreases linearly as it increases.

[0025] Using the formula: T lim =T a ×f lim Calculate the driving torque T after the vehicle speed limit. lim Among them, T a This indicates the current driving torque.

[0026] Control the drive motor output of the drive torque T after vehicle speed limitation lim This allows for the limitation of vehicle speed.

[0027] Preferably, the intelligent driving control adjustment strategy is to disable adaptive cruise control, cruise control, lane keeping assist, and lane departure warning. The vehicle accessory control adjustment strategy includes at least one of the following: air conditioning control strategy, interior lighting control strategy, voice interaction control strategy, and vehicle display control strategy. The air conditioning control strategy is to adjust the air conditioning fan speed to the lowest setting and limit the air conditioning compressor power based on the number of occupants. The interior lighting control strategy is to disable the ambient lighting and reduce the brightness of the interior lights to a preset first brightness threshold. The voice interaction control strategy is to disable the voice interaction function. The vehicle display control strategy is to control the display screen to only show navigation information, vehicle speed information, and comprehensive driving range information, and reduce the display screen brightness to a preset second brightness threshold.

[0028] In a second aspect, the present invention provides an energy-saving control system for range-extended vehicles, comprising a controller programmed to execute the above-described energy-saving control method for range-extended vehicles.

[0029] Thirdly, the present invention provides a range-extended vehicle, which includes the above-described range-extended vehicle energy-saving control system.

[0030] The present invention has the following effects:

[0031] (1) Based on the comprehensive driving range (i.e. remaining driving range) and the user's instruction to turn on the energy-saving mode, the energy-saving mode is turned on; the user can choose the vehicle energy-saving control strategy triggered in the energy-saving mode according to their own needs, which improves the driving range of the extended range vehicle, reduces the risk of the extended range vehicle breaking down, and improves the user experience.

[0032] (2) The vehicle energy-saving control strategy in energy-saving mode is at least one of the following: drive motor control adjustment strategy, energy recovery control adjustment strategy, vehicle speed control adjustment strategy, intelligent driving control adjustment strategy, on-board accessory control adjustment strategy, and range extender control adjustment strategy. Implementing the range extender control adjustment strategy reduces the fuel consumption of the range-extended vehicle, lowers the cost of use, and makes travel more economical. Implementing at least one of the drive motor control adjustment strategy, energy recovery control adjustment strategy, vehicle speed control adjustment strategy, intelligent driving control adjustment strategy, and on-board accessory control adjustment strategy reduces the electricity consumption of the range-extended vehicle. After implementing the above vehicle energy-saving control strategies, the driving range of the range-extended vehicle is increased, the risk that the remaining energy of the range-extended vehicle cannot support driving to a gas station or charging station is reduced (i.e., the risk of the range-extended vehicle breaking down is reduced), and the reliability and safety of the range-extended vehicle are improved. Attached Figure Description

[0033] Figure 1 This is a flowchart of the energy-saving control method for range-extended vehicles in an embodiment of the present invention.

[0034] Figure 2 This is a flowchart illustrating the method for calculating the current combined driving range of a range-extended vehicle in an embodiment of the present invention.

[0035] Figure 3 This is a flowchart of the energy recovery control and regulation strategy in an embodiment of the present invention.

[0036] Figure 4 This is a flowchart of the vehicle speed control adjustment strategy in an embodiment of the present invention. Detailed Implementation

[0037] To gain a more detailed understanding of the features and technical content of the embodiments of the present invention, the implementation of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of the present invention.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing embodiments of the invention only and is not intended to limit the invention.

[0039] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0040] In this embodiment of the invention, it is necessary to obtain the current driving information of the range-extended vehicle and the road type (which comes from the navigation positioning information on the navigation system) from the CAN bus. The methods for obtaining this information are all existing technologies. The current driving information of the range-extended vehicle includes: current vehicle speed, current accelerator pedal opening, current battery SOC value, current remaining fuel level, etc.

[0041] like Figure 1 As shown, the range-extended vehicle energy-saving control method in this embodiment of the invention is executed by a controller, and the control method includes:

[0042] Step 1: Determine if a command to turn on power saving mode has been received. If yes, proceed to step 9; otherwise, proceed to step 2.

[0043] This is where users can actively open the energy-saving mode control interface on the display screen and actively turn on the energy-saving mode. There is no need to judge the current comprehensive driving range of the range-extended vehicle; it can be turned on directly.

[0044] Step 2: Calculate the current combined driving range S of the range-extended vehicle. 总 Then proceed to step three.

[0045] In some embodiments, a method for calculating the current combined driving range of a range-extended vehicle (see...) Figure 2 )for:

[0046] First, using the formula: S 电 =SOC0*E 电 / C 电 Calculate the pure electric driving range S of the range-extended vehicle. 电 (Unit: km). Where SOC0 represents the current battery SOC value, E 电 C represents the total energy of the power battery (a known quantity, unit: kWh). 电 This indicates the preset energy consumption per unit distance (unit: kWh / km); SOC0*E 电 This represents the remaining energy of the power battery (unit: kWh). The preset energy consumption per unit mileage, C... 电 Test values ​​used when applying WLTC or CLTC test conditions to range-extended vehicles. For example, the energy consumption per unit mile under the CLTC test condition for range-extended vehicles is 0.13 kWh / km, which can be used as the preset energy consumption per unit mile, i.e., C. 电 = 0.13 kWh / km.

[0047] Then, using the formula: S 油 =V 油 / C 油 Calculate the fuel-powered driving range S of the range-extended vehicle. 油 (Unit: km). Wherein, V 油This indicates the current remaining fuel level in the vehicle (unit: L), C 油 This indicates the preset fuel consumption per unit distance (unit: L / km). Preset fuel consumption per unit distance C 油 Test values ​​when using range-extended vehicles under WLTC or CLTC regulatory test conditions. For example, if the fuel consumption per unit mileage under the CLTC test condition for a range-extended vehicle is 0.04 L / km, this value can be used as the preset fuel consumption per unit mileage, i.e., C. 油 =0.04L / km.

[0048] Finally, using the formula: S 总 =S 电 +S 油 The current combined driving range S of the range-extended vehicle is calculated. 总 (Unit: km)

[0049] Step 3: Determine whether the vehicle's current combined driving range (S) is an extended-range vehicle. 总 If the distance is less than the preset mileage threshold, proceed to step four; otherwise, proceed to step eight. For example, the preset mileage threshold is 50km.

[0050] Step 4: A confirmation prompt will be sent asking whether to enable energy-saving mode, and then step 5 will be executed.

[0051] In some embodiments, the confirmation prompt for whether to enable energy-saving mode is issued by displaying a pop-up window on the screen that says "The remaining driving range is low, it is recommended to enable energy-saving mode." The pop-up window has two selectable buttons: "Enable" and "Cancel."

[0052] Step 5: Determine if a confirmation command to activate energy-saving mode has been received. If yes, proceed to step 9; otherwise, proceed to step 6.

[0053] In some embodiments, if the user clicks the "On" button, they will receive a confirmation instruction to enable the energy-saving mode.

[0054] Step 6: Determine if a command to cancel power saving mode has been received. If yes, proceed to step 8; otherwise, proceed to step 7.

[0055] In some embodiments, if the user clicks the "Cancel" button, they will receive a command to cancel the activation of the energy-saving mode. When the command to cancel the activation of the energy-saving mode is received, the range-extended vehicle will maintain its original control strategy and will not enter energy-saving mode.

[0056] Step 7: Determine if the preset duration has been reached. If so, proceed to step 8; otherwise, return to step 5.

[0057] In some embodiments, if the user does not make a selection (click) within a preset duration, the range-extended vehicle will continue to drive using the original control strategy and will not enter energy-saving mode. As an example, the preset duration is 10 seconds.

[0058] Step 8: Continue driving with the original control strategy, and then end.

[0059] Step 9: Enter energy-saving mode, execute the selected vehicle energy-saving control strategy, and then end.

[0060] The selected vehicle energy-saving control strategies include at least one of the following: drive motor control adjustment strategy, energy recovery control adjustment strategy, vehicle speed control adjustment strategy, intelligent driving control adjustment strategy, vehicle accessory control adjustment strategy, and range extender control adjustment strategy.

[0061] The overall vehicle energy-saving control strategy includes: range extender control adjustment strategy, drive motor control adjustment strategy, energy recovery control adjustment strategy, vehicle speed control adjustment strategy, intelligent driving control adjustment strategy, and on-board accessory control adjustment strategy. The range extender control adjustment strategy is mandatory, and at least one of the remaining five strategies must be selected, although two, three, four, or five additional strategies can also be selected. For example, the selected vehicle energy-saving control strategies are: energy recovery control adjustment strategy and range extender control adjustment strategy. Alternatively, the selected strategies might be: drive motor control adjustment strategy, energy recovery control adjustment strategy, and range extender control adjustment strategy. Another example is: drive motor control adjustment strategy, energy recovery control adjustment strategy, vehicle speed control adjustment strategy, and range extender control adjustment strategy. Finally, the selected energy-saving mode can be called the ultimate energy-saving mode.

[0062] In some embodiments, the range extender control and regulation strategy includes a range extender start-stop control strategy and a range extender target power generation control strategy.

[0063] When not in energy-saving mode, the range extender maintains its original start-stop control strategy, specifically: if the range extender is in a stopped state, and the current vehicle speed is greater than 60km / h for more than 3 seconds, and the current battery SOC value is less than 18%, the range extender will be controlled to start generating electricity; if the range extender is in a working state, and the current vehicle speed is less than 50km / h for more than 3 seconds, or the current battery SOC value is greater than 23%, the range extender will be controlled to stop operating.

[0064] When not in energy-saving mode, the range extender's target power generation maintains the original control strategy, specifically: the target power generation of the range extender is the minimum value between the baseline value of the target power generation of the range extender at the same vehicle speed and the power limit of the range extender. The baseline value of the target power generation of the range extender is obtained by querying a preset baseline value table of the target power generation of the range extender based on the vehicle speed range and the battery SOC value range. As an example, the preset baseline value table of the target power generation of the range extender is shown in Table 1.

[0065] Table 1

[0066] 0~30km / h 30~60km / h 60~80km / h 80~100km / h 100km / h and above 0～10％ 18 kW 22kw 22kw 28kw 32kW 10～15％ 12kW 17kw 21kw 25kw 31kw 15% or more 5 kW 9kw 14kw 16kw 24kw

[0067] The range extender power limit is obtained by consulting a preset range extender power limit table based on the vehicle speed range. As an example, the preset range extender power limit table is shown in Table 2.

[0068] Table 2

[0069] Speed ​​range 0~40km / h 40~80km / h 80km / h and above Range extender power limit 20kW 40kW 60kW

[0070] After entering energy-saving mode, the range extender's start-stop control strategy is as follows: If the range extender is in a stopped state, it will start generating electricity when the current battery SOC value is less than a preset first SOC threshold; if the range extender is in an operating state, it will stop operating when the current battery SOC value is greater than a preset second SOC threshold. The preset second SOC threshold is greater than the preset first SOC threshold. For example, the preset first SOC threshold is 5%, and the preset second SOC threshold is 10%.

[0071] After entering energy-saving mode, the target power generation control strategy of the range extender is as follows:

[0072] After the range extender starts, the preset target power generation table of the range extender is consulted based on the current vehicle speed to obtain the corresponding target power generation of the range extender.

[0073] Then control the range extender to operate according to the corresponding target power generation capacity.

[0074] The preset target power generation table for the range extender is a table showing the correspondence between vehicle speed ranges and target power generation of the range extender, calibrated with fuel economy in mind. As an example, the preset target power generation table for the range extender is shown in Table 3.

[0075] Table 3

[0076] Speed ​​range 0~40km / h 40~80km / h 80km / h and above Target power generation of range extender 14kw 25kw 35kw

[0077] In some embodiments, the drive motor control adjustment strategy includes a drive torque limiting strategy and a drive torque change rate limiting strategy.

[0078] When not in the energy-saving mode, or when in the energy-saving mode but no drive motor control regulation strategy is selected, the driving torque maintains the original control strategy, specifically: First, query the preset driving torque table without limit according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding driving torque; then use this corresponding driving torque as the current driving torque. The preset driving torque table without limit is a corresponding relationship table of vehicle speed, accelerator pedal opening and driving torque obtained through calibration. As an example, the preset driving torque table without limit is shown in Table 4.

[0079] Table 4

[0080] 30km / h 60km / h 90km / h 20％ 18 Nm 10Nm 8Nm 50％ 35Nm 32Nm 26Nm 80％ 50Nm 48Nm 46Nm

[0081] When in the energy-saving mode and a drive motor control regulation strategy is selected, the driving torque limitation strategy is to reduce the output torque of the drive motor (i.e., the driving torque), and there are mainly two implementation methods. The first one is: First, query the preset driving torque limitation table according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding driving torque; then use this corresponding driving torque as the current driving torque. The preset driving torque limitation table is a corresponding relationship table of vehicle speed, accelerator pedal opening and driving torque obtained through calibration. As an example, the preset driving torque limitation table is shown in Table 5.

[0082] Table 5

[0083] 30km / h 60km / h 90km / h 20％ 15Nm 8Nm 6Nm 50％ 28Nm 25Nm 20Nm 80％ 40Nm 35Nm 30Nm

[0084] Comparing Table 4 and Table 5, it can be seen that at the same vehicle speed and accelerator pedal opening, the driving torque in the preset driving torque limitation table is smaller than the driving torque in the preset driving torque table without limit.

[0085] The second one is: First, query the preset driving torque table without limit (such as Table 4) according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding driving torque without limit; then use the product of this corresponding driving torque without limit and f as the current driving torque. Here, f represents the preset torque limitation coefficient, and 0 < f < 1. As an example, f = 0.8.

[0086] When not in energy-saving mode, or even if in energy-saving mode but without selecting a drive motor control adjustment strategy, the maximum value of the drive torque change rate remains unchanged. Specifically, it works as follows: first, based on the current vehicle speed and current drive torque, it queries a preset table of maximum drive torque change rate under unrestricted conditions to obtain the corresponding maximum drive torque change rate; then, it uses this corresponding maximum drive torque change rate as the current maximum drive torque change rate. The preset table of maximum drive torque change rate under unrestricted conditions is a table of correspondence between vehicle speed, drive torque, and maximum drive torque change rate obtained through calibration. As an example, the preset table of maximum drive torque change rate under unrestricted conditions is shown in Table 6.

[0087] Table 6

[0088] 30km / h 60km / h 90km / h 20Nm 170 Nm / s 220Nm / s 230Nm / s 30Nm 230Nm / s 280Nm / s 300Nm / s 50Nm 300Nm / s 350Nm / s 370Nm / s

[0089] When entering energy-saving mode and selecting the drive motor control adjustment strategy, the drive torque change rate limiting strategy reduces the maximum value of the drive motor output torque change rate (i.e., the maximum drive torque change rate). This is achieved by first querying a preset maximum drive torque change rate limit table based on the current vehicle speed and current drive torque to obtain the corresponding maximum drive torque change rate; then, using this corresponding maximum drive torque change rate as the current maximum drive torque change rate. The preset maximum drive torque change rate limit table is a table of correspondence between vehicle speed, drive torque, and the maximum drive torque change rate obtained through calibration. As an example, the preset maximum drive torque change rate limit table is shown in Table 7.

[0090] Table 7

[0091] 30km / h 60km / h 90km / h 20Nm 130Nm / s 170Nm / s 180Nm / s 30Nm 180Nm / s 220Nm / s 240Nm / s 50Nm 240Nm / s 270Nm / s 290Nm / s

[0092] Comparing Tables 6 and 7, it can be seen that, under the same vehicle speed and driving torque, the maximum value of the driving torque change rate in the preset maximum limit table is smaller than the maximum value of the driving torque change rate in the preset unrestricted table.

[0093] In some embodiments, when not in energy-saving mode, or when in energy-saving mode but without selecting an energy recovery control adjustment strategy, the energy recovery maintains its original control strategy. Specifically, it first queries a preset unadjusted energy recovery torque table based on the current vehicle speed and current accelerator pedal opening to obtain the corresponding energy recovery torque; then, it uses this corresponding energy recovery torque as the current energy recovery torque. The preset unadjusted energy recovery torque table (i.e., the existing energy recovery torque table when energy-saving mode is not activated) is a table of correspondence between vehicle speed, accelerator pedal opening, and energy recovery torque obtained through calibration. As an example, the preset unadjusted energy recovery torque table is shown in Table 8.

[0094] Table 8

[0095] 20km / h 60km / h 100km / h 0％ 100Nm 130Nm 60Nm 10％ 60Nm 90Nm 40Nm 20％ 5Nm 20Nm 20Nm

[0096] When entering energy-saving mode and selecting an energy recovery control adjustment strategy, the energy recovery control adjustment strategy will be executed (see [link]). Figure 3 This strategy includes:

[0097] Step S11: (Based on navigation information) Determine whether the current route of the extended-range vehicle is a highway or expressway. If so, proceed to step S12; otherwise (i.e., if the current route of the extended-range vehicle is an urban road or a mountain road), proceed to step S14.

[0098] Step S12: Query the preset energy recovery torque table I based on the current vehicle speed and current accelerator pedal opening to obtain the corresponding energy recovery torque, and then execute step S13. The preset energy recovery torque table I is a table showing the correspondence between vehicle speed, accelerator pedal opening, and energy recovery torque obtained through calibration. As an example, the preset energy recovery torque table I is shown in Table 9.

[0099] Table 9

[0100] 20km / h 60km / h 100km / h 0％ 90Nm 100Nm 20Nm 10％ 50Nm 70Nm 0Nm 20％ 0Nm 10Nm 0Nm

[0101] Comparing Tables 8 and 9, it can be seen that, compared with the preset unadjusted energy recovery torque table, at the same vehicle speed and accelerator pedal opening, the energy recovery torque in the preset energy recovery torque table I is smaller than the energy recovery torque in the preset unadjusted energy recovery torque table.

[0102] Step S13: Use the corresponding energy recovery torque as the current energy recovery torque, and then end.

[0103] Step S14: Query the preset energy recovery torque table II based on the current vehicle speed and current accelerator pedal opening to obtain the corresponding energy recovery torque, and then execute step S15. The preset energy recovery torque table II is a table showing the correspondence between vehicle speed, accelerator pedal opening, and energy recovery torque obtained through calibration. As an example, the preset energy recovery torque table II is shown in Table 10.

[0104] Table 10

[0105] 20km / h 60km / h 100km / h 0％ 120Nm 150Nm 62Nm 10％ 80Nm 110Nm 42Nm 20％ 20Nm 30Nm 22Nm

[0106] Comparing Tables 8 and 10, it can be seen that, compared with the preset unadjusted energy recovery torque table, at the same vehicle speed and accelerator pedal opening, the energy recovery torque in the preset energy recovery torque table II is greater than the energy recovery torque in the preset unadjusted energy recovery torque table.

[0107] Step S15: Use the corresponding energy recovery torque as the current energy recovery torque, and then end.

[0108] When not in energy-saving mode, or when in energy-saving mode but without selecting a speed control adjustment strategy, the vehicle speed will be controlled according to the original normal speed control logic, and no speed limit will be imposed.

[0109] In some embodiments, when entering energy-saving mode and selecting a vehicle speed control adjustment strategy, the vehicle speed control adjustment strategy will be executed (see...). Figure 4 This strategy specifically includes:

[0110] Step S21: Reduce the preset speed limit value V according to the current vehicle speed. lim The difference is used to query the preset drive torque limit ratio table to obtain the corresponding drive torque limit ratio f. lim Then proceed to step S22.

[0111] Among them, the preset drive torque limit ratio table is obtained by calibrating the vehicle speed minus V. lim The difference (i.e., the speed limit difference: vehicle speed - V) lim A table showing the correspondence between the speed limit value V and the drive torque limit ratio. As an example, the preset speed limit value V... lim =120km / h.

[0112] The preset drive torque limit ratio table is as follows:

[0113] Vehicle speed - V lim When the speed is less than or equal to the preset first speed threshold, the drive torque limit ratio is 1.

[0114] Vehicle speed - V lim When the speed is greater than or equal to the preset second speed threshold, the drive torque limit ratio is 0.

[0115] Vehicle speed - V lim When the speed is greater than a preset first speed threshold and less than a preset second speed threshold, the drive torque limiting ratio is between 1 and 0, varying with vehicle speed -V. lim It decreases linearly as it increases.

[0116] As an example, the preset first speed threshold is -5km / h, and the preset second speed threshold is 0km / h.

[0117] Step S22, using the formula: T lim =T a ×f lim Calculate the driving torque T after the vehicle speed limit. lim Then proceed to step S23. Where T a This indicates the current driving torque.

[0118] Step S23: Control the drive motor to output the drive torque T after the vehicle speed limit. lim Then it ends, thus achieving the limitation on vehicle speed.

[0119] In some embodiments, when entering energy-saving mode and selecting an intelligent driving control adjustment strategy, the intelligent driving control adjustment strategy will be executed. This strategy is to disable adaptive cruise control, cruise control, lane keeping assist, and lane departure warning (provided that the range-extended vehicle has intelligent driving functions; if the range-extended vehicle does not have intelligent driving functions, the intelligent driving control adjustment strategy does not need to be executed).

[0120] In some embodiments, when entering energy-saving mode and selecting an in-vehicle accessory control adjustment strategy, the in-vehicle accessory control adjustment strategy will be executed. This strategy includes at least one of the following: air conditioning control strategy, in-vehicle lighting control strategy, voice interaction control strategy, and in-vehicle display control strategy.

[0121] The air conditioning control strategy is as follows: the air conditioning fan speed is adjusted to the lowest setting, and the air conditioning compressor power is limited according to the number of passengers in the vehicle. For example, with the air conditioning fan speed adjusted to the lowest setting and the air conditioning temperature set to 26℃, the air conditioning compressor power is limited to 1kW when there is only one person in the vehicle (driver), 2kW when there are two people in the vehicle, and 5kW when there are more than two people in the vehicle.

[0122] The interior lighting control strategy is as follows: turn off the ambient lighting and reduce the brightness of the interior lights to a preset first brightness threshold. For example, the preset first brightness threshold is 20% of the maximum brightness of the interior lights.

[0123] The voice interaction control strategy is to disable the voice interaction function.

[0124] The in-vehicle display control strategy is as follows: the display screen is controlled to only show navigation information, vehicle speed information, and overall driving range information, and the display screen brightness is reduced to a preset second brightness threshold. For example, the preset second brightness threshold is 20% of the display screen's maximum brightness.

[0125] In addition, embodiments of the present invention also provide an energy-saving control system for range-extended vehicles, which includes a controller programmed to execute the above-described energy-saving control method for range-extended vehicles.

[0126] In addition, this invention also provides a range-extended vehicle, which includes the above-mentioned range-extended vehicle energy-saving control system and is equipped with a vehicle infotainment system, air conditioning, in-vehicle lighting equipment, etc., and has functions such as voice interaction and intelligent driving.

[0127] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for energy saving control of a range extended vehicle, characterized by, The method comprises: calculating the current comprehensive driving range of the extended-range vehicle and determining whether an instruction to open the energy-saving mode is received; if the current comprehensive driving range of the extended-range vehicle is less than a preset range threshold, issuing a confirmation prompt for whether to open the energy-saving mode; if an instruction to open the energy-saving mode is received or an instruction to confirm opening the energy-saving mode is received, entering the energy-saving mode and executing a selected vehicle energy-saving control strategy; wherein the selected vehicle energy-saving control strategy is at least one of a driving motor control adjustment strategy, an energy recovery control adjustment strategy, a vehicle speed control adjustment strategy, an intelligent driving control adjustment strategy, a vehicle-mounted accessory control adjustment strategy, and an extended-range device control adjustment strategy; the energy recovery control adjustment strategy comprises: determining whether the current road on which the extended-range vehicle is traveling is a highway or an expressway; if yes, querying a preset energy recovery torque table I according to the current vehicle speed and the current accelerator pedal opening degree to obtain a corresponding energy recovery torque; and taking the corresponding energy recovery torque as the current energy recovery torque; wherein the preset energy recovery torque table I is a correspondence table of vehicle speed, accelerator pedal opening degree, and energy recovery torque obtained through calibration; compared with a preset energy recovery torque table without adjustment, the energy recovery torque table I has a smaller energy recovery torque at the same vehicle speed and accelerator pedal opening degree; if no, querying a preset energy recovery torque table II according to the current vehicle speed and the current accelerator pedal opening degree to obtain a corresponding energy recovery torque; and taking the corresponding energy recovery torque as the current energy recovery torque; wherein the preset energy recovery torque table II is a correspondence table of vehicle speed, accelerator pedal opening degree, and energy recovery torque obtained through calibration; compared with a preset energy recovery torque table without adjustment, the energy recovery torque table II has a larger energy recovery torque at the same vehicle speed and accelerator pedal opening degree.

2. The range extending vehicle energy saving control method of claim 1, wherein, The method for calculating the current comprehensive driving range of the extended-range vehicle comprises: Using the formula: S 电 = SOC0 * E 电 / C 电 , the pure electric cruising range S 电 of the extended-range vehicle is calculated. Wherein, SOC0 represents a current battery SOC value, E 电 represents the total energy of the power battery, C 电 represents a preset unit mileage power consumption; Using the formula: S 油 =V 油 / C 油 , the fuel range S 油 of the extended-range vehicle is calculated; wherein V 油 represents the current remaining fuel amount of the vehicle, and C 油 represents the preset fuel consumption per unit distance. Using the formula: S 总 = S 电 + S 油 , the current comprehensive cruising range S 总 of the extended-range vehicle is calculated.

3. The energy-saving control method for the extended-range vehicle according to claim 1, wherein: the extended-range device control adjustment strategy comprises an extended-range device start-stop control strategy and an extended-range device target power generation control strategy; the extended-range device start-stop control strategy comprises: if the extended-range device is in a stopped state, controlling the extended-range device to start power generation when the current battery SOC value is less than a preset first SOC threshold; and if the extended-range device is in a working state, controlling the extended-range device to stop running when the current battery SOC value is greater than a preset second SOC threshold; wherein the preset second SOC threshold is greater than the preset first SOC threshold; the extended-range device target power generation control strategy comprises: after the extended-range device is started, querying a preset extended-range device target power generation table according to the current vehicle speed to obtain a corresponding extended-range device target power generation; and controlling the extended-range device to run according to the corresponding extended-range device target power generation; wherein the preset extended-range device target power generation table is a correspondence table of vehicle speed intervals and extended-range device target power generation obtained through calibration under consideration of fuel economy.

4. The energy-saving control method for the extended-range vehicle according to claim 1, wherein: The driving motor control adjustment strategy comprises a driving torque limitation strategy and a driving torque rate of change limitation strategy. The driving torque limitation strategy is: according to the current vehicle speed and the current accelerator pedal opening, a preset driving torque limitation table is inquired to obtain a corresponding driving torque; the corresponding driving torque is taken as the current driving torque; wherein the preset driving torque limitation table is a correspondence table of vehicle speed, accelerator pedal opening and driving torque obtained through calibration; compared with the preset driving torque table without limitation, the driving torque is smaller under the same vehicle speed and accelerator pedal opening. The driving torque rate of change limitation strategy is: according to the current vehicle speed and the current driving torque, a preset driving torque rate of change maximum value limitation table is inquired to obtain a corresponding driving torque rate of change maximum value; the corresponding driving torque rate of change maximum value is taken as the current driving torque rate of change maximum value; wherein the preset driving torque rate of change maximum value limitation table is a correspondence table of vehicle speed, driving torque and driving torque rate of change maximum value obtained through calibration; compared with the preset driving torque rate of change maximum value table without limitation, the driving torque rate of change maximum value is smaller under the same vehicle speed and driving torque.

5. The energy-saving control method of the range-extended vehicle according to claim 1, characterized in that: The driving motor control adjustment strategy comprises a driving torque limitation strategy and a driving torque rate of change limitation strategy. The driving torque limitation strategy is: according to the current vehicle speed and the current accelerator pedal opening, a preset driving torque table without limitation is inquired to obtain a corresponding driving torque; the product of the corresponding driving torque and f is taken as the current driving torque; wherein the preset driving torque table without limitation is a correspondence table of vehicle speed, accelerator pedal opening and driving torque obtained through calibration, and f represents a preset torque limitation coefficient, 0 < f < 1. The driving torque rate of change limitation strategy is: according to the current vehicle speed and the current driving torque, a preset driving torque rate of change maximum value limitation table is inquired to obtain a corresponding driving torque rate of change maximum value; the corresponding driving torque rate of change maximum value is taken as the current driving torque rate of change maximum value; wherein the preset driving torque rate of change maximum value limitation table is a correspondence table of vehicle speed, driving torque and driving torque rate of change maximum value obtained through calibration; compared with the preset driving torque rate of change maximum value table without limitation, the driving torque rate of change maximum value is smaller under the same vehicle speed and driving torque.

6. The range extending vehicle energy saving control method of claim 4 or 5, characterized in that, The vehicle speed control adjustment strategy is: According to the current vehicle speed minus the preset speed limit value V lim , a preset drive torque limit proportion table is queried to obtain a corresponding drive torque limit proportion f lim ; wherein the preset drive torque limit proportion table is a correspondence relationship table between the difference between the vehicle speed minus V lim and the drive torque limit proportion obtained through calibration; in the preset drive torque limit proportion table: when the difference between the vehicle speed minus V lim is less than or equal to a preset first speed threshold, the drive torque limit proportion is 1; when the difference between the vehicle speed minus V lim is greater than or equal to a preset second speed threshold, the drive torque limit proportion is 0; when the difference between the vehicle speed minus V lim is greater than the preset first speed threshold and less than the preset second speed threshold, the drive torque limit proportion linearly decreases between 1 and 0 with the increase of the difference between the vehicle speed minus V lim . Using the formula: T lim = T a × f lim , the driving torque T lim after speed limitation is calculated; wherein T a represents the current driving torque; controlling the drive motor to output the drive torque T after the vehicle speed limitation lim .

7. The energy-saving control method of the range-extended vehicle according to any one of claims 1 to 5, characterized in that: The intelligent driving control adjustment strategy is: the adaptive cruise function, the constant speed cruise function, the lane keeping function and the lane departure warning function are closed; The vehicle-mounted accessory control adjustment strategy comprises at least one of the following: an air conditioner control strategy, an interior light control strategy, a voice interaction control strategy and a vehicle-mounted display control strategy. The air conditioner control strategy is: adjusting the air conditioner air volume to the lowest, limiting the air conditioner compressor power according to the number of drivers and passengers in the vehicle; The vehicle interior light control strategy is: controlling the vehicle interior atmosphere lamp to be off, and controlling the brightness of the vehicle interior illuminating lamp to be reduced to a preset first brightness threshold; The voice interaction control strategy is: controlling the voice interaction function to be off; The vehicle display control strategy is: controlling the display screen to display only navigation information, vehicle speed information and comprehensive cruising range information, and controlling the display screen brightness to be reduced to a preset second brightness threshold.

8. A range extending vehicle energy saving control system comprising a controller, characterized by: The controller is programmed to perform the range-extended vehicle energy-saving control method according to any one of claims 1 to 7.

9. A range extended vehicle characterized by: The range-extended vehicle energy-saving control system according to claim 8. The range-extended vehicle energy-saving control system according to claim 8.

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