Range-extended vehicle energy-saving control method and system and range-extended vehicle

Abstract

The invention discloses an energy-saving control method and system for an extended-range vehicle and the extended-range vehicle, and the method comprises the steps: calculating the current comprehensive driving range of the extended-range vehicle, and judging whether an energy-saving mode opening instruction is received or not; if the current comprehensive driving mileage of the extended-range vehicle is smaller than the preset mileage threshold value, a confirmation prompt whether the energy-saving mode is started or not is sent out; and if an energy-saving mode opening confirmation instruction is received or an energy-saving mode opening instruction is received, entering an energy-saving mode, and executing the selected vehicle energy-saving control strategy. Wherein the selected vehicle energy-saving control strategy comprises at least one of a driving motor control adjusting strategy, an energy recovery control adjusting strategy, a vehicle speed control adjusting strategy, an intelligent driving control adjusting strategy and a vehicle-mounted accessory control adjusting strategy and a range extender control adjusting strategy. By adopting the method, the driving range of the extended-range vehicle can be increased, the lying risk of the extended-range vehicle is reduced, the power consumption and the oil consumption are reduced, and the extended-range vehicle is more economical to travel.

Description

Technical Field

[0001] The present invention belongs to the field of vehicle energy-saving control, and in particular relates to an energy-saving control method and system for an extended-range vehicle and an extended-range vehicle. Background Art

[0002] Range-extended vehicles are hybrid electric vehicles that can generate electricity during driving and replenish the power battery by controlling the range extender to consume fuel. When the remaining power of the range-extended vehicle is low and the remaining fuel is low, there is a risk that the remaining energy cannot support the range-extended vehicle to drive to the charging station or gas station, causing the range-extended vehicle to break down. In addition, some range-extended vehicle users hope to reduce power consumption and fuel consumption as much as possible during driving to reduce vehicle use costs and extend the vehicle's combined pure electric and fuel driving range.

[0003] At present, some electric vehicles have energy-saving modes. When the power battery is low, they will enter energy-saving mode to reduce vehicle energy consumption by limiting vehicle speed, limiting driving torque, increasing energy recovery intensity, etc. However, it is aimed at pure electric vehicles and does not involve the fuel consumption issues that need to be considered for extended-range vehicles; in addition, the design of increasing energy recovery intensity regardless of actual driving conditions sometimes leads to more power loss. Therefore, how to control the energy saving of extended-range vehicles is an urgent problem that needs to be solved. Summary of the invention

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

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

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

[0007] If the current comprehensive cruising range of the extended-range vehicle is less than the preset mileage threshold, a confirmation prompt will be issued to ask whether to turn on the energy-saving mode.

[0008] If a confirmation instruction to turn on the energy-saving mode is received or an instruction to turn on the energy-saving mode is received, the energy-saving mode is entered and the selected vehicle energy-saving control strategy is executed. Among them, the selected vehicle energy-saving control strategy is: 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 vehicle accessory control adjustment strategy, and the range extender control adjustment strategy. 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 vehicle accessory control adjustment strategy. The range extender control adjustment strategy is required, and 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 comprehensive driving range of the extended-range vehicle is:

[0010] Using the formula: S 电 =SOC0*E 电 / C 电 , calculate the pure electric driving range S of the extended-range vehicle 电 (Unit: km). SOC0 represents the current battery SOC value, E 电 Indicates the total energy of the power battery (unit: kwh), C 电 Indicates the preset unit mileage power consumption (unit: kwh / km); SOC0*E 电 It indicates the remaining energy of the power battery (unit: kwh).

[0011] Using the formula: S 油 =V 油 / C 油 , calculate the fuel range S of the extended-range vehicle 油 (Unit: km). Where V 油 Indicates the current remaining fuel volume of the vehicle (unit: L), C 油 Indicates the preset fuel consumption per mileage (unit: L / km).

[0012] Using the formula: S 总 =S 电 +S 油 , calculate the current comprehensive driving range of the extended-range vehicle S 总 (Unit: km).

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

[0014] The start-stop control strategy of the range extender is: if the range extender is in a stopped state, when the current battery SOC value is less than the preset first SOC threshold, the range extender is controlled to start generating electricity; if the range extender is in a working state, when the current battery SOC value is greater than the preset second SOC threshold, the range extender is controlled to stop running; wherein the preset second SOC threshold is greater than the preset first SOC threshold. The start-stop control strategy of the range extender only uses the current battery SOC value as the basis for judgment, and no longer considers the influence of vehicle speed, which simplifies the control logic and reduces the problem of repeated start-stop of the range extender during short-distance driving caused by vehicle speed fluctuations, which is conducive to extending the life of the range extender, improving power generation efficiency, and reducing energy conversion losses.

[0015] The range extender target power generation control strategy is: after the range extender is started, the preset range extender target power generation table is queried according to the current vehicle speed to obtain the corresponding range extender target power generation; the range extender is controlled to operate according to the corresponding range extender target power generation. Among them, the preset range extender target power generation table is a correspondence table between the vehicle speed range and the range extender target power generation obtained by calibration under the consideration of fuel economy. When the energy-saving mode is not turned on, since the driver and passengers of the range extender vehicle have certain requirements for NVH performance during driving, and the range extender noise is positively correlated with the range extender power generation; therefore, at different vehicle speeds, the range extender power is limited. When the energy-saving mode is not turned on, the target power generation of the range extender is the minimum value of the target power generation base value of the range extender and the power limit value of the range extender at the same vehicle speed; the target power generation base value of the range extender is obtained by querying the preset target power generation base value table of the range extender according to the vehicle speed range and the battery SOC value range, and the power limit value of the range extender is obtained by querying the preset power limit value table of the range extender according to the vehicle speed range. At this time, the NVH performance corresponding to the target power generation of the range extender is good, but the fuel economy is not good. After the energy-saving mode is turned on, the target power generation of the range extender is not constrained by the NVH performance, but mainly considers the fuel economy, thereby reducing fuel consumption, making the extended-range vehicle travel more economical, and also simplifying the control logic.

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

[0017] The driving torque limiting strategy is to reduce the output torque of the driving motor (i.e., the driving torque), and there are two main ways to implement it. The first is: query the preset driving torque limiting table according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding driving torque; and use the corresponding driving torque as the current driving torque. Among them, the preset driving torque limiting table is a correspondence table of vehicle speed, accelerator pedal opening and driving torque obtained through calibration; compared with the preset driving torque table when not limited, the preset driving torque limiting table has a smaller driving torque at the same vehicle speed and accelerator pedal opening; the preset driving torque table when not limited is a correspondence table of vehicle speed, accelerator pedal opening and driving torque obtained through calibration. The second is: query the preset driving torque table when not limited according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding (unlimited) driving torque; and use the product of the corresponding (unlimited) driving torque and f as the current driving torque; wherein f represents the preset torque limit coefficient, 0 <f<1。

[0018] The driving torque change rate limiting strategy is to reduce the maximum value of the output torque change rate of the driving motor (i.e., the maximum value of the driving torque change rate, which can also be referred to as the driving torque change rate limit), and is implemented as follows: query the preset driving torque change rate maximum value limiting table according to the current vehicle speed and the current driving torque to obtain the corresponding maximum value of the driving torque change rate; use the corresponding maximum value of the driving torque change rate as the current maximum value of the driving torque change rate; wherein, the preset driving torque change rate maximum value limiting table is a correspondence table of vehicle speed, driving torque and maximum value of driving torque change rate obtained by calibration; compared with the preset driving torque change rate maximum value table when not limited, the preset driving torque change rate maximum value limiting table has a smaller driving torque change rate maximum value under the same vehicle speed and driving torque; the preset driving torque change rate maximum value table when not limited is a correspondence table of vehicle speed, driving torque and maximum value of driving torque change rate obtained by calibration.

[0019] Preferably, the energy recovery control adjustment strategy is:

[0020] Determine whether the current extended-range vehicle driving road is a highway or an expressway.

[0021] If so, the preset energy recovery torque I table is queried according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding energy recovery torque; the corresponding energy recovery torque is used as the current energy recovery torque; wherein the preset energy recovery torque I table is a correspondence table of vehicle speed, accelerator pedal opening and energy recovery torque obtained by calibration; compared with the preset energy recovery torque table when not adjusted, the preset energy recovery torque I table has a smaller energy recovery torque at the same vehicle speed and accelerator pedal opening; the preset energy recovery torque table when not adjusted is a correspondence table of vehicle speed, accelerator pedal opening and energy recovery torque obtained by calibration. When the extended-range vehicle is traveling on a highway or expressway, the vehicle speed is high and relatively stable, and the deceleration demand is low. If the energy recovery intensity is increased (i.e., the energy recovery torque is increased) in this scenario, when the user releases the accelerator pedal, the vehicle speed will decrease rapidly, and then the user wants to continue to maintain the original vehicle speed, and needs to step on the accelerator pedal more significantly. This behavior will cause the kinetic energy of the extended-range vehicle to be converted into electrical energy through energy recovery, and then the electrical energy is converted into kinetic energy through the drive motor, which will be affected by the charging and discharging efficiency of the power battery. Therefore, in this scenario, it is necessary to reduce the energy recovery intensity (i.e., reduce the energy recovery torque). After the user releases the accelerator pedal, the vehicle can glide naturally. When the user needs to decelerate, the vehicle can brake by stepping on the brake pedal, thus avoiding the loss of electric energy due to repeated energy recovery and drive motor output of the extended-range vehicle.

[0022] If not, the preset energy recovery torque II table is queried according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding energy recovery torque; the corresponding energy recovery torque is used as the current energy recovery torque; wherein the preset energy recovery torque II table is a corresponding relationship table of vehicle speed, accelerator pedal opening and energy recovery torque obtained through calibration; compared with the preset energy recovery torque table when not adjusted, the preset energy recovery torque II table has a larger energy recovery torque at the same vehicle speed and accelerator pedal opening. When the vehicle is not traveling on a highway or expressway, but on urban roads, mountain roads, etc., the extended-range vehicle has frequent acceleration and deceleration actions. In this scenario, increasing the energy recovery intensity (i.e., increasing the energy recovery torque) can convert the kinetic energy of the extended-range vehicle into electrical energy to the greatest extent, thereby increasing the pure electric driving range.

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

[0024] According to the current vehicle speed, the preset speed limit value V is reduced lim The difference is obtained by querying the preset driving torque limit ratio table to obtain the corresponding driving torque limit ratio f lim ; Among them, the preset driving torque limit ratio table is the vehicle speed minus V obtained by calibration lim The corresponding relationship table of the difference between the speed and the driving torque limit ratio; in the preset driving torque limit ratio table: the vehicle speed minus V limWhen the difference is less than or equal to the preset first speed threshold, the driving torque limit ratio is 1, and the vehicle speed is reduced by V lim When the difference between the vehicle speed and the speed threshold is greater than or equal to the preset second speed threshold, the driving torque limit ratio is 0; lim When the difference between V and V is greater than a preset first speed threshold and less than a preset second speed threshold, the driving torque limit ratio is between 1 and 0 as the vehicle speed decreases. lim It decreases linearly with the increase of the difference.

[0025] Using the formula: T lim =T a ×f lim , calculate the driving torque T after speed limit lim ; Among them, T a Indicates the current driving torque.

[0026] Control the drive motor to output the drive torque T after the vehicle speed is limited lim , thereby limiting the vehicle speed.

[0027] Preferably, the intelligent driving control adjustment strategy is: turning off the adaptive cruise function, the cruise control function, the lane keeping function and the lane departure warning function. The vehicle-mounted accessory control adjustment strategy includes: at least one of the air conditioning control strategy, the interior lighting control strategy, the voice interaction control strategy and the vehicle-mounted display control strategy. The air conditioning control strategy is: adjusting the air volume of the air conditioner to the minimum, and limiting the power of the air conditioning compressor according to the number of drivers and passengers in the car. The interior lighting control strategy is: controlling the interior atmosphere light to turn off, and controlling the brightness of the interior lighting to be reduced to a preset first brightness threshold. The voice interaction control strategy is: controlling the voice interaction function to turn off. The vehicle-mounted display control strategy is: controlling the display screen to only display navigation information, vehicle speed information, and comprehensive driving range information, and controlling the brightness of the display screen to be reduced to a preset second brightness threshold.

[0028] In a second aspect, the present invention provides an extended-range vehicle energy-saving control system, which includes a controller programmed to execute the above-mentioned extended-range vehicle energy-saving control method.

[0029] In a third aspect, the present invention provides an extended-range vehicle, which includes the above-mentioned extended-range vehicle energy-saving control system.

[0030] The present invention has the following effects:

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

[0032] (2) The energy-saving control strategies of the vehicle in the energy-saving mode are: 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 vehicle accessory control adjustment strategy, as well as the range extender control adjustment strategy. The implementation of the range extender control adjustment strategy reduces the fuel consumption of the range-extended vehicle, reduces the cost of using the vehicle, and makes the travel of the range-extended vehicle more economical; the implementation of 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 vehicle accessory control adjustment strategy reduces the power consumption of the range-extended vehicle; after the implementation of the above-mentioned vehicle energy-saving control strategies, the driving range of the range-extended vehicle is improved, the risk that the remaining energy of the range-extended vehicle cannot support driving to a gas station or charging station is reduced (that is, the risk of the range-extended vehicle breaking down is reduced), and the reliability and safety of the range-extended vehicle are improved. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0035] Figure 3 This is a flow chart of the energy recovery control adjustment strategy in an embodiment of the present invention.

[0036] Figure 4 It is a flow chart of the vehicle speed control adjustment strategy in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present invention, the implementation of the embodiments of the present invention is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference 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 those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0039] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be 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 the embodiment of the present invention, it is necessary to obtain the current extended-range vehicle driving information and the type of road on which the extended-range vehicle is traveling from the CAN bus (the road type comes from the navigation positioning information on the navigation system), and the methods of obtaining this information belong to the prior art. The current extended-range vehicle driving information includes: current vehicle speed, current accelerator pedal opening, current battery SOC value, current vehicle remaining fuel, etc.

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

[0042] The first step is to determine whether an instruction to turn on the energy-saving mode is received. If so, execute step 9, otherwise execute step 2.

[0043] Here, the user actively opens the energy-saving mode control interface on the display screen and actively turns on the energy-saving mode. There is no need to judge the current comprehensive driving range conditions of the extended-range vehicle and it can be turned on directly.

[0044] Step 2: Calculate the current comprehensive driving range S of the extended-range vehicle 总 , and then proceed to step 3.

[0045] In some embodiments, a method for calculating the current comprehensive driving range of an extended-range 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 extended-range vehicle 电 (Unit: km). SOC0 represents the current battery SOC value, E 电 Represents the total energy of the power battery (a known quantity, unit: kwh), C 电 Indicates the preset unit mileage power consumption (unit: kwh / km); SOC0*E 电 It indicates the remaining energy of the power battery (unit: kwh). The preset unit mileage power consumption C 电 The test value when using an extended-range vehicle for the WLTC or CLTC test conditions. For example, the unit mileage power consumption of the extended-range vehicle CLTC test condition is 0.13 kwh / km, which can be used as the preset unit mileage power consumption, i.e. C 电 =0.13kwh / km.

[0047] Then, using the formula: S 油 =V 油 / C 油 , calculate the fuel range S of the extended-range vehicle 油 (Unit: km). Where V 油Indicates the current remaining fuel volume of the vehicle (unit: L), C 油 Indicates the preset unit mileage fuel consumption (unit: L / km). 油 The test value when using an extended-range vehicle for the WLTC or CLTC test conditions. For example, the unit mileage fuel consumption of the extended-range vehicle CLTC test condition is 0.04L / km, which can be used as the preset unit mileage fuel consumption, i.e. C 油 =0.04L / km.

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

[0049] Step 3: Determine whether the current comprehensive driving range of the extended-range vehicle is S 总 If the mileage is less than the preset mileage threshold, then the fourth step is executed, otherwise the eighth step is executed. As an example, the preset mileage threshold is 50 km.

[0050] Step 4: A confirmation prompt is issued to confirm whether to turn on the energy-saving mode, and then proceed to step 5.

[0051] In some embodiments, the method of issuing a confirmation prompt for turning on the energy-saving mode is: a pop-up prompt "The remaining driving range is low, it is recommended to turn on the energy-saving mode" is displayed on the display screen, and the pop-up prompt has two selectable buttons: "Turn on" and "Cancel".

[0052] Step 5: Determine whether a confirmation instruction to start the energy-saving mode is received. If yes, execute step 9; otherwise, execute step 6.

[0053] In some embodiments, if the user clicks the "On" button, an instruction to confirm turning on the energy saving mode will be received.

[0054] Step 6: Determine whether a command to cancel the energy saving mode is received. If yes, execute step 8; otherwise, execute step 7.

[0055] In some embodiments, if the user clicks the "Cancel" button, an instruction to cancel the energy-saving mode will be received. When the instruction to cancel the energy-saving mode is received, the extended-range vehicle will maintain the original control strategy and will not enter the energy-saving mode.

[0056] Step 7: Determine whether the preset duration has been reached. If yes, execute step 8; otherwise, return to execute step 5.

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

[0058] Step 8. Maintain 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] Among them, the selected vehicle energy-saving control strategies are: 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, 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 vehicle accessories control adjustment strategy. The range extender control adjustment strategy is mandatory, and at least one of the remaining five strategies must be selected, and two, three, four or five strategies can also be selected. For example, the selected vehicle energy-saving control strategy is: energy recovery control adjustment strategy and range extender control adjustment strategy. For example, the selected vehicle energy-saving control strategy is: drive motor control adjustment strategy, energy recovery control adjustment strategy and range extender control adjustment strategy. For example, the selected vehicle energy-saving control strategy is: drive motor control adjustment strategy, energy recovery control adjustment strategy, vehicle speed control adjustment strategy and range extender control adjustment strategy. For example, the selected vehicle energy-saving control strategy is: drive motor control adjustment strategy, energy recovery control adjustment strategy, vehicle speed control adjustment strategy, intelligent driving control adjustment strategy, vehicle accessories control adjustment strategy and range extender control adjustment strategy. The energy-saving mode at this time can be called the extreme energy-saving mode.

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

[0063] When the energy-saving mode is not entered, the start and stop of the range extender maintains the original control strategy, specifically: if the range extender is in the stopped state, when the current vehicle speed is greater than 60km / h and the duration exceeds 3s, and the current battery SOC value is less than 18%, the range extender is controlled to start and generate electricity; if the range extender is in the working state, when the current vehicle speed is less than 50km / h and the duration exceeds 3s, or the current battery SOC value is greater than 23%, the range extender is controlled to stop running.

[0064] When the energy-saving mode is not entered, the target power generation power of the range extender maintains the original control strategy, specifically: the target power generation power of the range extender takes the minimum value of the target power generation power reference value of the range extender and the power limit value of the range extender at the same vehicle speed. The target power generation power reference value of the range extender is obtained by querying the preset target power generation power reference value table of the range extender according to the vehicle speed range and the battery SOC value range. As an example, the preset target power generation power reference value table 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 or more 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 querying a preset range extender power limit table according to 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 or above Range extender power limit 20kw 40kw 60kw

[0070] After entering the energy-saving mode, the start-stop control strategy of the range extender is: if the range extender is in the stopped state, when the current battery SOC value is less than the preset first SOC threshold, the range extender is controlled to start generating electricity; if the range extender is in the working state, when the current battery SOC value is greater than the preset second SOC threshold, the range extender is controlled to stop running. Among them, the preset second SOC threshold is greater than the preset first SOC threshold. As an example, the preset first SOC threshold is 5%, and the preset second SOC threshold is 10%.

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

[0072] After the range extender is started, the preset range extender target power generation table is queried according to the current vehicle speed to obtain the corresponding range extender target power generation power.

[0073] The range extender is then controlled to operate according to the corresponding target power generation power of the range extender.

[0074] The preset range extender target power table is a correspondence table between the vehicle speed range and the range extender target power obtained by calibration under the consideration of fuel economy. As an example, the preset range extender target power table is shown in Table 3.

[0075] Table 3

[0076] Speed ​​range 0~40km / h 40~80km / h 80km / h or above Range extender target power generation 14kw 25kw 35kw

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

[0078] When not in the energy-saving mode, or when in the energy-saving mode but no drive motor control adjustment strategy is selected, the drive torque maintains the original control strategy, specifically: First, query the preset drive torque table without restrictions according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding drive torque; then use this corresponding drive torque as the current drive torque. The preset drive torque table without restrictions is a correspondence table of vehicle speed, accelerator pedal opening, and drive torque obtained through calibration. As an example, the preset drive torque table without restrictions 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 adjustment strategy is selected, the drive torque limitation strategy is to reduce the output torque of the drive motor (i.e., the drive torque), and there are mainly two implementation methods. The first one is: First, query the preset drive torque limitation table according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding drive torque; then use this corresponding drive torque as the current drive torque. The preset drive torque limitation table is a correspondence table of vehicle speed, accelerator pedal opening, and drive torque obtained through calibration. As an example, the preset drive 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 drive torque in the preset drive torque limitation table is smaller than that in the preset drive torque table without restrictions.

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

[0086] When the energy-saving mode is not entered, or when the energy-saving mode is entered but the drive motor control adjustment strategy is not selected, the maximum value of the drive torque change rate maintains the original control strategy, specifically: first query the preset maximum value table of the drive torque change rate when not restricted according to the current vehicle speed and the current drive torque, and obtain the corresponding maximum value of the drive torque change rate; then use the corresponding maximum value of the drive torque change rate as the current maximum value of the drive torque change rate. Among them, the preset maximum value table of the drive torque change rate when not restricted is a correspondence table of the vehicle speed, drive torque and the maximum value of the drive torque change rate obtained by calibration. As an example, the preset maximum value table of the drive torque change rate when not restricted is shown in Table 6.

[0087] Table 6

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

[0089] When entering the energy-saving mode and selecting the drive motor control adjustment strategy, 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 value of the drive torque change rate), which is implemented as follows: first query the preset drive torque change rate maximum value limiting table according to the current vehicle speed and the current drive torque to obtain the corresponding maximum value of the drive torque change rate; then use the corresponding maximum value of the drive torque change rate as the current maximum value of the drive torque change rate. The preset drive torque change rate maximum value limiting table is a correspondence table of the vehicle speed, drive torque and drive torque change rate maximum value obtained by calibration. As an example, the preset drive torque change rate maximum value limiting 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] By comparing Table 6 and Table 7, it can be seen that under the same vehicle speed and driving torque, the maximum driving torque change rate in the preset driving torque change rate maximum limit table is smaller than the maximum driving torque change rate in the preset unlimited driving torque change rate maximum table.

[0093] In some embodiments, when the energy-saving mode is not entered, or when the energy-saving mode is entered but the energy recovery control adjustment strategy is not selected, the energy recovery maintains the original control strategy, specifically: first query the preset unadjusted energy recovery torque table according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding energy recovery torque; then use the 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 the energy-saving mode is not turned on) is a correspondence table of 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 the energy recovery control adjustment strategy, the energy recovery control adjustment strategy will be executed (see Figure 3 ), the strategy includes:

[0097] Step S11, (according to the navigation information) determine whether the current extended-range vehicle driving road is a highway or an expressway, if so, execute step S12, otherwise (that is, when the current extended-range vehicle driving road is an urban road or a mountain road), execute step S14.

[0098] Step S12: query the preset energy recovery torque I table according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding energy recovery torque, and then execute step S13. The preset energy recovery torque I table is a correspondence table of vehicle speed, accelerator pedal opening and energy recovery torque obtained by calibration. As an example, the preset energy recovery torque I table 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] By comparing Table 8 and Table 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 I table 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 II table according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding energy recovery torque, and then execute step S15. The preset energy recovery torque II table is a correspondence table of vehicle speed, accelerator pedal opening and energy recovery torque obtained by calibration. As an example, the preset energy recovery torque II table 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] By comparing Table 8 and Table 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 II table 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 the energy-saving mode is not entered, or when the energy-saving mode is entered but the vehicle speed control adjustment strategy is not selected, the vehicle speed is controlled according to the original normal speed control logic and no speed limit is performed.

[0109] In some embodiments, when the energy saving mode is entered and the vehicle speed control adjustment strategy is selected, the vehicle speed control adjustment strategy is executed (see Figure 4 ), the strategy specifically includes:

[0110] Step S21: Reduce the preset speed limit value V according to the current vehicle speed. lim The difference is obtained by querying the preset driving torque limit ratio table to obtain the corresponding driving torque limit ratio f lim , then execute step S22.

[0111] The preset driving torque limit ratio table is the vehicle speed minus V obtained by calibration. lim The difference (i.e. speed limit difference: vehicle speed - V lim ) and the corresponding relationship table of the driving torque limit ratio. As an example, the preset speed limit value V lim =120km / h.

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

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

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

[0115] Vehicle speed - V lim When the speed is greater than the preset first speed threshold and less than the preset second speed threshold, the driving torque limit ratio is between 1 and 0 as the vehicle speed -V lim decreases linearly with the increase of .

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

[0117] Step S22, using the formula: T lim =T a ×f lim , calculate the driving torque T after speed limit lim , then execute step S23. Wherein, T a Indicates the current driving torque.

[0118] Step S23: Control the drive motor to output the drive torque T after the vehicle speed is limited. lim , and then end, thereby achieving the speed limit.

[0119] In some embodiments, when entering the energy-saving mode and selecting the intelligent driving control adjustment strategy, the intelligent driving control adjustment strategy will be executed, which is: turning off the adaptive cruise function, cruise control function, lane keeping function and lane departure warning function (provided that the extended-range vehicle has an intelligent driving function; if the extended-range vehicle does not have an intelligent driving function, there is no need to execute the intelligent driving control adjustment strategy).

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

[0121] The air conditioning control strategy is: adjust the air conditioning volume to the minimum and limit the air conditioning compressor power according to the number of passengers in the car. For example, adjust the air conditioning volume to the minimum, set the air conditioning temperature to 26°C, and limit the air conditioning compressor power to 1kw when there is only one driver in the car, limit the air conditioning compressor power to 2kw when there are two people in the car, and limit the air conditioning compressor power to 5kw when there are more than two people in the car.

[0122] The vehicle interior lighting control strategy is: controlling the vehicle interior ambient light to be turned off, and controlling the brightness of the vehicle interior lighting to be reduced to a preset first brightness threshold. As an example, the preset first brightness threshold is 20% of the maximum brightness of the vehicle interior lighting.

[0123] The voice interaction control strategy is: control the voice interaction function to be turned off.

[0124] The vehicle display control strategy is: control the display screen to only display navigation information, vehicle speed information, and comprehensive driving range information, and control the display screen brightness to be reduced to a preset second brightness threshold. As an example, the preset second brightness threshold is 20% of the maximum brightness of the display screen.

[0125] In addition, an embodiment of the present invention further provides an extended-range vehicle energy-saving control system, which includes a controller, and the controller is programmed to execute the above-mentioned extended-range vehicle energy-saving control method.

[0126] In addition, an embodiment of the present invention further provides an extended-range vehicle, which includes the above-mentioned extended-range vehicle energy-saving control system, and is equipped with a vehicle computer, air conditioning, interior lighting equipment, etc., and has functions such as voice interaction and intelligent driving.

[0127] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A range-extended vehicle energy-saving control method, characterized in that: include: Calculate the current comprehensive driving range of the extended-range vehicle and determine whether a command to turn on the energy-saving mode has been received; If the current comprehensive driving range of the extended-range vehicle is less than the preset mileage threshold, a confirmation prompt will be issued to ask whether to turn on the energy-saving mode; If a confirmation instruction to turn on the energy-saving mode is received or a instruction to turn on the energy-saving mode is received, the energy-saving mode is entered and the selected vehicle energy-saving control strategy is executed; wherein the selected vehicle energy-saving control strategy is: 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 vehicle accessory control adjustment strategy, and the range extender control adjustment strategy.

2. The range-extended vehicle energy-saving control method according to claim 1, characterized in that: The method for calculating the current comprehensive driving range of the extended-range vehicle is: Using the formula: S 电 =SOC0*E 电 / C 电 , calculate the pure electric driving range S of the extended-range vehicle 电 ; Among them, SOC0 represents the current battery SOC value, E 电 Indicates the total energy of the power battery, C 电 Indicates the preset power consumption per unit mileage; Using the formula: S 油 =V 油 / C 油 , calculate the fuel range S of the extended-range vehicle 油 ; Among them, V 油 Indicates the current remaining fuel volume of the vehicle, C 油 Indicates the preset unit mileage fuel consumption; Using the formula: S 总 =S 电 +S 油 , calculate the current comprehensive driving range of the extended-range vehicle S 总 .

3. The range-extended vehicle energy-saving control method according to claim 1, characterized in that: The range extender control and regulation strategy includes a range extender start and stop control strategy and a range extender target power generation control strategy; The start-stop control strategy of the range extender is: if the range extender is in a stopped state, when the current battery SOC value is less than a preset first SOC threshold, the range extender is controlled to start generating electricity; if the range extender is in a working state, when the current battery SOC value is greater than a preset second SOC threshold, the range extender is controlled to stop running; wherein the preset second SOC threshold is greater than the preset first SOC threshold; The range extender target power generation control strategy is: after the range extender is started, a preset range extender target power generation table is queried according to the current vehicle speed to obtain the corresponding range extender target power generation; the range extender is controlled to operate according to the corresponding range extender target power generation; wherein the preset range extender target power generation table is a correspondence table between vehicle speed intervals and range extender target power generation obtained by calibration under the consideration of fuel economy.

4. The range-extended vehicle energy-saving control method according to claim 1, characterized in that: The drive motor control adjustment strategy includes a drive torque limitation strategy and a drive torque change rate limitation strategy; The driving torque limiting strategy is: querying a preset driving torque limiting table according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding driving torque; using the corresponding driving torque as the current driving torque; wherein the preset driving torque limiting table is a corresponding relationship table of vehicle speed, accelerator pedal opening and driving torque obtained by calibration; compared with the preset driving torque table when not limited, the preset driving torque limiting table has a smaller driving torque under the same vehicle speed and accelerator pedal opening; The driving torque change rate limiting strategy is: query the preset driving torque change rate maximum value limiting table according to the current vehicle speed and the current driving torque to obtain the corresponding driving torque change rate maximum value; use the corresponding driving torque change rate maximum value as the current driving torque change rate maximum value; wherein, the preset driving torque change rate maximum value limiting table is a correspondence table of vehicle speed, driving torque and driving torque change rate maximum value obtained by calibration; compared with the preset driving torque change rate maximum value table when not limited, the preset driving torque change rate maximum value limiting table has a smaller driving torque change rate maximum value under the same vehicle speed and driving torque.

5. The range-extended vehicle energy-saving control method according to claim 1, characterized in that: The drive motor control strategy includes a drive torque limiting strategy and a drive torque change rate limiting strategy; The driving torque limiting strategy is: according to the current vehicle speed and the current accelerator pedal opening, a preset driving torque table when not limited is searched to obtain the corresponding driving torque; the product of the corresponding driving torque and f is used as the current driving torque; wherein the preset driving torque table when not limited is a corresponding relationship table of vehicle speed, accelerator pedal opening and driving torque obtained by calibration, f represents a preset torque limiting coefficient, 0 <f<1; The driving torque change rate limiting strategy is: query the preset driving torque change rate maximum value limiting table according to the current vehicle speed and the current driving torque to obtain the corresponding driving torque change rate maximum value; use the corresponding driving torque change rate maximum value as the current driving torque change rate maximum value; wherein, the preset driving torque change rate maximum value limiting table is a correspondence table of vehicle speed, driving torque and driving torque change rate maximum value obtained by calibration; compared with the preset driving torque change rate maximum value table when not limited, the preset driving torque change rate maximum value limiting table has a smaller driving torque change rate maximum value under the same vehicle speed and driving torque.

6. The range-extended vehicle energy-saving control method according to claim 1, characterized in that: The energy recovery control adjustment strategy is: Determine whether the current extended-range vehicle driving road is a highway or expressway; If so, query the preset energy recovery torque I table according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding energy recovery torque; use the corresponding energy recovery torque as the current energy recovery torque; wherein the preset energy recovery torque I table is a correspondence table of vehicle speed, accelerator pedal opening and energy recovery torque obtained by calibration; compared with the preset unadjusted energy recovery torque table, the preset energy recovery torque I table has a smaller energy recovery torque at the same vehicle speed and accelerator pedal opening; If not, the preset energy recovery torque II table is queried according to the current vehicle speed and the current accelerator pedal opening to obtain the corresponding energy recovery torque; the corresponding energy recovery torque is used as the current energy recovery torque; wherein, the preset energy recovery torque II table is a correspondence table of vehicle speed, accelerator pedal opening and energy recovery torque obtained through calibration; compared with the preset unadjusted energy recovery torque table, the preset energy recovery torque II table has a larger energy recovery torque at the same vehicle speed and accelerator pedal opening.

7. The range-extended vehicle energy-saving control method according to claim 4 or 5, characterized in that: The vehicle speed control adjustment strategy is: According to the current vehicle speed, the preset speed limit value V is reduced lim The difference is obtained by querying the preset driving torque limit ratio table to obtain the corresponding driving torque limit ratio f lim ; Among them, the preset driving torque limit ratio table is the vehicle speed minus V obtained by calibration lim The corresponding relationship table of the difference between the speed and the driving torque limit ratio; in the preset driving torque limit ratio table: the vehicle speed minus V lim When the difference is less than or equal to the preset first speed threshold, the driving torque limit ratio is 1, and the vehicle speed is reduced by V lim When the difference between the vehicle speed and the speed threshold is greater than or equal to the preset second speed threshold, the driving torque limit ratio is 0; lim When the difference between V and V is greater than a preset first speed threshold and less than a preset second speed threshold, the driving torque limit ratio is between 1 and 0 as the vehicle speed decreases. lim It decreases linearly with the increase of the difference; Using the formula: T lim =T a ×f lim , calculate the driving torque T after speed limit lim ; Among them, T a Indicates the current driving torque; Control the drive motor to output the drive torque T after the vehicle speed is limited lim .

8. The energy-saving control method for a range-extended vehicle according to any one of claims 1 to 6, characterized in that: The intelligent driving control adjustment strategy is: turning off the adaptive cruise function, the cruise control function, the lane keeping function and the lane departure warning function; The vehicle-mounted accessory control and adjustment strategy includes: at least one of an air conditioning control strategy, an in-vehicle lighting control strategy, a voice interaction control strategy, and a vehicle-mounted display control strategy; The air conditioning control strategy is: adjusting the air conditioning air volume to the minimum and limiting the air conditioning compressor power according to the number of passengers in the vehicle; The in-car lighting control strategy is: controlling the in-car ambient light to be turned off, and controlling the brightness of the in-car lighting to be reduced to a preset first brightness threshold; The voice interaction control strategy is: controlling the voice interaction function to be turned off; The vehicle-mounted display control strategy is: controlling the display screen to only display navigation information, vehicle speed information, and comprehensive driving range information, and controlling the brightness of the display screen to be reduced to a preset second brightness threshold.

9. An energy-saving control system for an extended-range vehicle, comprising a controller, characterized in that: The controller is programmed to execute the extended-range vehicle energy-saving control method as claimed in any one of claims 1 to 8.

10. A range-extended vehicle, characterized in that: It includes the range-extended vehicle energy-saving control system as claimed in claim 9.

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