A control method, control system and vehicle for improving energy recovery of hybrid electric vehicle

Abstract

The present invention relates to a control method, a control system and a vehicle for improving the energy recovery of a hybrid vehicle. The control method is: if the vehicle enters energy recovery, the time interval ∆t between the current energy recovery and the previous one is obtained. 实 , the charging time t of the power battery under the current energy recovery, the battery temperature T and the battery SOC. Based on the latter three, the target time interval ∆t is obtained and ∆t is compared. 实 and ∆t, to obtain the total charging time t of the power battery 总 ; Based on T, SOC and t 总 , obtain the maximum allowable charging power of the battery; based on the current vehicle speed, brake pedal opening and energy recovery intensity gear, obtain the second recovery power; obtain the external characteristic power of the drive motor; obtain the minimum value of the three powers as the actual recovery power of the drive motor. The present invention comprehensively considers the influence of the power battery power, power battery temperature and power battery charging time on the maximum allowable charging power of the power battery, thereby improving the maximum energy recovery capacity of the whole vehicle.

Description

Technical Field

[0001] The invention relates to the technical field of automobile energy recovery, and in particular to a control method, a control system and a vehicle for improving energy recovery of a hybrid power automobile. Background Art

[0002] Energy recovery is one of the most important energy-saving methods for hybrid electric vehicles. In the actual development process, in order to prevent the increase of internal pressure, deformation and leakage of the power battery caused by overcharging, the energy recovery power cannot exceed the maximum allowable charging power of the power battery. Therefore, the maximum allowable charging power of the power battery is an important boundary that limits the energy recovery capacity of the whole vehicle, especially in the case of high speed, large braking force or downhill, the energy that can be recovered by the whole vehicle is large, and the maximum allowable charging power of the power battery will be the key to limiting energy recovery.

[0003] Prior art, such as a pure electric vehicle and its energy recovery control method and control system disclosed in CN 110877529 A, only considers the maximum allowable charging power of the power battery based on the remaining power of the power battery and the long-term charging of the power battery at different temperatures, and does not consider the maximum allowable charging power of the power battery based on the change of charging time. In order to avoid overcharging of the battery, it is speculated that it conservatively takes the maximum charging power of the power battery charged for a long time (continuous charging for more than 10 seconds) as the maximum allowable charging power of the power battery, which obviously limits the maximum recovery capacity of the power battery. At the same time, in this method, the battery power is calculated by the battery voltage, and the maximum allowable charging current of the battery is calculated by the battery power and the battery temperature. The impact of the battery charging time is also not considered.

[0004] However, research has found that the maximum charging power of a power battery is related to the battery SOC, battery temperature, and battery charging time. When the battery SOC and battery temperature are constant, the maximum charging power of the battery decreases as the battery charging time increases. Figure 2 As shown in Figure 1, the relationship between the maximum allowable charging power and charging time of a hybrid vehicle power battery when the battery temperature is 45°C and the battery SOC is 40%. Figure 2 It can be seen that when the power battery charging time is 1 second, the maximum charging power of the power battery is 70kw. When the charging time is 10 seconds, the maximum allowable charging power is only 52Kw, a difference of 34.6%. Summary of the invention

[0005] The purpose of the present invention is to provide a control method, a control system and a vehicle for improving the energy recovery of a hybrid electric vehicle, so as to comprehensively consider the influence of the power battery power, the power battery temperature and the power battery charging time on the maximum allowable charging power of the power battery, so as to improve the maximum energy recovery capability of the whole vehicle.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A control method for improving energy recovery of a hybrid electric vehicle comprises the following steps:

[0008] Determine whether the hybrid vehicle enters the energy recovery mode;

[0009] If the hybrid vehicle has entered the energy recovery mode, obtain the actual time interval between the current energy recovery mode and the previous energy recovery mode, obtain the charging time of the power battery in the current energy recovery mode, and the current power battery temperature and remaining power, and obtain the target time interval based on the charging time of the power battery, the power battery temperature and the remaining power;

[0010] Compare the actual time interval with the target time interval. When the actual time interval is greater than the target time interval, the total time the power battery has been charged is reset to zero. When the actual time interval is less than or equal to the target time interval, the total time the power battery has been charged is the sum of the time the power battery has been charged in the current energy recovery mode and the time the power battery has been charged in the previous energy recovery mode.

[0011] Based on the power battery temperature, the remaining power and the total charging time of the power battery, obtaining the maximum allowable charging power of the power battery, and using the maximum allowable charging power of the power battery as the first recovery power;

[0012] Based on the current vehicle speed, the opening degree of the brake pedal and the energy recovery intensity gear, a second recovery power is obtained;

[0013] Taking the external characteristic power value of the driving motor as the maximum recovery power of the driving motor, and taking the maximum recovery power of the driving motor as the third recovery power;

[0014] The first recovery power, the second recovery power and the third recovery power are compared to obtain a minimum value, and the minimum value is used as the actual recovery power of the drive motor.

[0015] Preferably, determining whether the hybrid electric vehicle enters the energy recovery mode includes:

[0016] When the hybrid vehicle is in a braking state or a coasting state, the hybrid vehicle is controlled to enter a corresponding energy recovery mode. After the hybrid vehicle enters the corresponding energy recovery mode, if it is detected that the current vehicle speed is less than a preset speed, the vehicle is controlled to exit the energy recovery mode.

[0017] Preferably, when the hybrid electric vehicle is in a braking state or a coasting state, controlling the hybrid electric vehicle to enter a corresponding energy recovery mode further includes the following steps:

[0018] It is determined whether the operating gear, vehicle speed and remaining power of the power battery of the hybrid vehicle meet the preset conditions. If the preset conditions are met and the hybrid vehicle is in a braking state or a coasting state, the hybrid vehicle is controlled to enter a corresponding energy recovery mode. If the preset conditions are not met, the hybrid vehicle is not controlled to enter a corresponding energy recovery mode even if the hybrid vehicle is in a braking state or a coasting state.

[0019] Preferably, when the hybrid electric vehicle is in a braking state or a coasting state, controlling the hybrid electric vehicle to enter a corresponding energy recovery mode includes:

[0020] When the hybrid vehicle is in a braking state, the hybrid vehicle is controlled to enter a braking energy recovery mode;

[0021] When the hybrid vehicle is in a coasting state, the hybrid vehicle is controlled to enter a coasting energy recovery mode.

[0022] Preferably, obtaining the target time interval based on the charging time of the power battery, the temperature of the power battery and the remaining power includes:

[0023] Based on the charging time of the power battery, the temperature of the power battery and the remaining power, the target time interval is obtained by looking up a table;

[0024] Based on the power battery temperature, the remaining power, and the total charging time of the power battery, obtaining the maximum allowable charging power of the power battery, including:

[0025] Based on the power battery temperature, the remaining power and the total charging time of the power battery, obtaining the maximum allowable charging power of the power battery by looking up a table;

[0026] The external characteristic power value of the driving motor is used as the maximum recovery power of the driving motor, including:

[0027] The external characteristic power value of the driving motor is obtained by looking up the table, and is used as the maximum recovery power of the driving motor.

[0028] Preferably, obtaining the second recovery power based on the current vehicle speed, the opening degree of the brake pedal and the energy recovery intensity gear includes:

[0029] In the braking condition energy recovery mode, the second recovery power is obtained by looking up the table based on the current vehicle speed, the opening of the brake pedal and the energy recovery intensity gear;

[0030] In the energy recovery mode of the coasting condition, the second recovery power is obtained by looking up the table based on the current vehicle speed and the energy recovery intensity gear.

[0031] The present invention also provides a control system for improving energy recovery of a hybrid electric vehicle, comprising:

[0032] A judgment module, used to judge whether the hybrid vehicle enters an energy recovery mode;

[0033] A first obtaining module is used to obtain an actual time interval between a current energy recovery mode and a previous energy recovery mode, and obtain a power battery charging time in the current energy recovery mode, as well as a current power battery temperature and a remaining power, and obtain a target time interval based on the power battery charging time, the power battery temperature and the remaining power;

[0034] A first comparison module is used to compare the actual time interval with the target time interval. When the actual time interval is greater than the target time interval, the total time of charging the power battery is reset to zero. When the actual time interval is less than or equal to the target time interval, the total time of charging the power battery is the sum of the charging time of the power battery in the current energy recovery mode and the charging time of the power battery in the previous energy recovery mode.

[0035] a second obtaining module, configured to obtain a maximum allowable charging power of the power battery based on the power battery temperature, the remaining power and the total charging time of the power battery, and use the maximum allowable charging power of the power battery as the first recovery power;

[0036] A third obtaining module, used for obtaining a second recovery power based on the current vehicle speed, the opening degree of the brake pedal and the energy recovery intensity gear;

[0037] A fourth obtaining module is used to obtain an external characteristic power value of the driving motor and use it as the third recovery power;

[0038] The second comparison module is used to compare the first recovery power, the second recovery power and the third recovery power to obtain a minimum value, and use the minimum value as the actual recovery power of the drive motor.

[0039] Preferably, the third acquisition module includes a first acquisition submodule and a second acquisition submodule;

[0040] The first acquisition submodule is used to obtain the second recovery power by looking up a table based on the current vehicle speed, the opening of the brake pedal and the energy recovery intensity gear in the braking condition energy recovery mode;

[0041] The second acquisition submodule is used to obtain the second recovery power by looking up a table based on the current vehicle speed and the energy recovery intensity gear in the coasting condition energy recovery mode.

[0042] The present invention also provides a vehicle, comprising the control system for improving energy recovery of a hybrid electric vehicle according to the present invention.

[0043] Beneficial effects of the present invention:

[0044] The control method for improving the energy recovery of a hybrid vehicle of the present invention comprehensively considers the influence of the power battery power, the power battery temperature and the power battery charging time on the maximum allowable charging power of the power battery when obtaining the maximum allowable charging power of the power battery, thereby fully utilizing the maximum allowable charging power of the power battery. When the charging time is short, a larger maximum allowable charging power can be obtained, thereby effectively improving the maximum energy recovery capacity of the whole vehicle. At the same time, in order to avoid overcharging of the battery, a timing logic is introduced, and the target interval time is obtained by calibration, thereby effectively solving the problem of easily causing overcharging of the battery by re-entering the energy recovery mode after exiting the energy recovery mode for a short time during actual driving. The method has promotion and application value in the field of automobile energy recovery technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a flow chart of the control method of the present invention;

[0046] Figure 2 This is a graph showing the relationship between the maximum allowable charging power and charging time of a hybrid vehicle power battery at 45°C and 40% SOC;

[0047] Figure 3 This is a diagram showing the energy recovery increment effect obtained by using the control method of the present invention when the hybrid vehicle power battery is decelerated for 10 seconds at 45°C and 40% SOC. DETAILED DESCRIPTION

[0048] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0049] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0050] Example 1

[0051] like Figure 1 As shown, a control method for improving energy recovery of a hybrid vehicle comprises the following steps:

[0052] S1. Determine whether the hybrid vehicle enters the energy recovery mode, including:

[0053] S11, determining whether the operating gear position, vehicle speed, and remaining power of the power battery of the hybrid vehicle meet preset conditions;

[0054] S12, if the preset conditions are met and when the hybrid electric vehicle is in a braking state or a coasting state, controlling the hybrid electric vehicle to enter a corresponding energy recovery mode;

[0055] S121, if the preset conditions are met and the hybrid electric vehicle is in a braking state, controlling the hybrid electric vehicle to enter a braking condition energy recovery mode;

[0056] S122, if the preset conditions are met, when the hybrid electric vehicle is in a coasting state, controlling the hybrid electric vehicle to enter a coasting energy recovery mode;

[0057] Among them, after the hybrid electric vehicle enters the corresponding energy recovery mode, if it is detected that the current vehicle speed is less than the preset speed, the vehicle is controlled to exit the energy recovery mode;

[0058] S2. If the hybrid vehicle has entered the corresponding energy recovery mode, obtain the actual time interval between the current energy recovery mode and the previous energy recovery mode, obtain the charging time of the power battery in the current energy recovery mode, and the current power battery temperature and remaining power, and obtain the target time interval by looking up the table based on the charging time of the power battery, the power battery temperature and the remaining power;

[0059] Among them, the target time interval Δt is obtained through experimental calibration. The target time interval Δt is the time interval for the total charging time to be reset to zero. It represents how long it takes for the power battery to recover to its original charging capacity after charging at the maximum allowable power for a certain period of time. The three-dimensional characteristic table of the target time interval of the power battery obtained by experimental calibration is shown in Table 1. Table 1 is stored in the battery management system as a calibration quantity for subsequent table lookup to obtain the target time interval for the total charging time to be reset to zero. In order to ensure the safety of battery charging, the maximum allowable charging power is used for charging tests to obtain the target time interval. As shown in Table 1, when the remaining power is SOC1, the battery temperature is T1, and the battery charging time is t1, the battery needs an interval of 1Δt1 to recover to its original charging capacity;

[0060] Table 1 Three-dimensional characteristics of target time interval of power battery

[0061]

[0062] In Table 1, SOC represents the remaining power, T represents the power battery temperature, t represents the power battery charging time, Δt represents the target time interval of the power battery, and n and m are positive integers. For example, if a hybrid vehicle has entered the corresponding energy recovery mode, the power battery has been charged for t1, the power battery temperature is T1, and the remaining power is SOC1, then the target time interval of the power battery is 1Δt1.

[0063] S3. Compare the actual time interval with the target time interval. When the actual time interval is greater than the target time interval, the total time of the power battery charging is reset to zero. When the actual time interval is less than or equal to the target time interval, the total time of the power battery charging is the sum of the power battery charging time in the current energy recovery mode and the power battery charging time in the previous energy recovery mode. For example, the actual time interval Δt between the current energy recovery mode and the previous energy recovery mode is obtained. 实 , compare Δt 实 The relationship between the size of Δt, when Δt 实 >Δt, reset the total charging time of the power battery to zero. 实 ≤Δt, the total charging time of the power battery is the sum of the charging time of the power battery in the current energy recovery mode and the charging time of the power battery in the previous energy recovery mode;

[0064] S4. Based on the power battery temperature, the remaining power, and the total charging time of the power battery, obtain the maximum allowable charging power of the power battery by looking up a table, and use the maximum allowable charging power of the power battery as the first recovery power;

[0065] Among them, the maximum allowable charging power of the power battery is obtained through experimental calibration. The three-dimensional characteristic table between the maximum allowable charging power of the power battery and the remaining power, power battery temperature, and total charging time is measured in the laboratory and stored in the battery management system as a calibration quantity for subsequent table lookup to obtain the maximum allowable charging power of the power battery. The maximum allowable charging power of the battery under a specific remaining power, specific temperature, and specific total charging time is characterized, and the results are shown in Table 2.

[0066] Table 2 Three-dimensional characteristics of the maximum allowable charging power of power batteries

[0067]

[0068] In Table 2, SOC represents the remaining power, T represents the power battery temperature, and t 总 Indicates the total charging time of the power battery, kW indicates the maximum allowable charging power of the power battery, and n and m are positive integers. For example, when the remaining power is SOC1, the battery temperature is T1, and the total battery charging time is t 总1, the maximum allowable charging power of the power battery is 1kw1.

[0069] S5. Obtaining a second recovery power based on the current vehicle speed, the opening degree of the brake pedal, and the energy recovery intensity gear, specifically including:

[0070] In the braking condition energy recovery mode, the second recovery power is obtained by looking up the table based on the current vehicle speed, the opening of the brake pedal and the energy recovery intensity gear;

[0071] In the coasting energy recovery mode, the second recovery power is obtained by looking up the table based on the current vehicle speed and energy recovery intensity gear;

[0072] Among them, the second recovery power is obtained through experimental calibration;

[0073] S6, obtaining an external characteristic power value of the driving motor by looking up a table, using the external characteristic power value of the driving motor as the maximum recovery power of the driving motor, and using the maximum recovery power of the driving motor as the third recovery power;

[0074] The first recovery power, the second recovery power and the third recovery power are compared to obtain a minimum value, and the minimum value is used as the actual recovery power of the driving motor.

[0075] by Figure 2 Take the relationship between the maximum allowable charging power and charging time of a hybrid vehicle power battery in the case of a battery temperature of 45°C and a battery SOC of 40% as an example. Assume that a common operating condition of a user of the hybrid vehicle is: the vehicle weight is 2000kg, the vehicle speed is 80km / s, the battery temperature is 45°C, and the battery SOC is 40%. 2 ) for 1 second, assuming that the vehicle resistance is 600N (wind resistance, rolling resistance, internal resistance, etc.), the maximum recovery power of the drive motor (i.e., the third recovery power) P3=200kw. At this time, the control method in this embodiment is used to calculate that the recoverable power of the whole vehicle (i.e., the second recovery power) P2=(2000*2-700)*80 / 3600=75kW, and the maximum allowable charging power of the power battery (i.e., the first recovery power) P1=70kw. Accordingly, the actual recovered energy of the power battery E1=70Kw*1s / 3600=19.4Wh. If the control method of the present invention is not used for calculation, the maximum allowable charging power of the power battery (i.e., the first recovery power) P1'=52KW, and the recovered energy E2=52kw*1s / 3600=14.4Wh. Therefore, after adopting the control method of the present invention, the energy recovery efficiency is improved by 34.6%. If under this working condition, deceleration is performed for 10 seconds, during the entire recovery process, the energy recovery increment effect is as follows. Figure 3 , mark 1 area.

[0076] At the same time, in order to avoid overcharging of the power battery, timing logic is introduced and a target interval time is set, which effectively solves the problem of exiting the energy recovery mode for a short time and then entering the energy recovery mode again during actual driving. For example, after recovering energy at the maximum allowable power of the power battery for 1 second, the energy recovery mode is exited for 0.3 seconds, and then the energy recovery mode is entered again. At this time, if charging is performed according to the maximum allowable charging power at 1 second, the battery may be overcharged.

[0077] Example 2

[0078] A control system for improving energy recovery in a hybrid electric vehicle, comprising:

[0079] A judgment module, used to judge whether the hybrid vehicle enters an energy recovery mode;

[0080] A first obtaining module is used to obtain an actual time interval between a current energy recovery mode and a previous energy recovery mode, and obtain a power battery charging time in the current energy recovery mode, as well as a current power battery temperature and a remaining power, and obtain a target time interval based on the power battery charging time, the power battery temperature and the remaining power;

[0081] A first comparison module is used to compare the actual time interval with the target time interval. When the actual time interval is greater than the target time interval, the total time of charging the power battery is reset to zero. When the actual time interval is less than or equal to the target time interval, the total time of charging the power battery is the sum of the charging time of the power battery in the current energy recovery mode and the charging time of the power battery in the previous energy recovery mode.

[0082] a second obtaining module, configured to obtain a maximum allowable charging power of the power battery based on the power battery temperature, the remaining power and the total charging time of the power battery, and use the maximum allowable charging power of the power battery as the first recovery power;

[0083] A third obtaining module, used for obtaining a second recovery power based on the current vehicle speed, the opening degree of the brake pedal and the energy recovery intensity gear;

[0084] A fourth obtaining module is used to obtain an external characteristic power value of the driving motor and use it as the third recovery power;

[0085] The second comparison module is used to compare the first recovery power, the second recovery power and the third recovery power to obtain a minimum value, and use the minimum value as the actual recovery power of the drive motor.

[0086] Wherein, the third acquisition module includes a first acquisition submodule and a second acquisition submodule;

[0087] The first acquisition submodule is used to obtain the second recovery power by looking up a table based on the current vehicle speed, the opening of the brake pedal and the energy recovery intensity gear in the braking condition energy recovery mode;

[0088] The second acquisition submodule is used to obtain the second recovery power by looking up a table based on the current vehicle speed and the energy recovery intensity gear in the coasting condition energy recovery mode.

[0089] This embodiment also provides a vehicle, including the control system for improving energy recovery of a hybrid electric vehicle in this embodiment.

[0090] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A control method for improving energy recovery of a hybrid electric vehicle, characterized in that: The following steps are involved: Determine whether the hybrid vehicle enters the energy recovery mode; If the hybrid vehicle has entered the energy recovery mode, obtain the actual time interval between the current energy recovery mode and the previous energy recovery mode, obtain the charging time of the power battery in the current energy recovery mode, and the current power battery temperature and remaining power, and obtain the target time interval based on the charging time of the power battery, the power battery temperature and the remaining power; Compare the actual time interval with the target time interval. When the actual time interval is greater than the target time interval, the total time the power battery has been charged is reset to zero. When the actual time interval is less than or equal to the target time interval, the total time the power battery has been charged is the sum of the time the power battery has been charged in the current energy recovery mode and the time the power battery has been charged in the previous energy recovery mode. Based on the power battery temperature, the remaining power and the total charging time of the power battery, obtaining the maximum allowable charging power of the power battery, and using the maximum allowable charging power of the power battery as the first recovery power; Based on the current vehicle speed, the opening degree of the brake pedal and the energy recovery intensity gear, a second recovery power is obtained; Taking the external characteristic power value of the driving motor as the maximum recovery power of the driving motor, and taking the maximum recovery power of the driving motor as the third recovery power; The first recovery power, the second recovery power and the third recovery power are compared to obtain a minimum value, and the minimum value is used as the actual recovery power of the drive motor.

2. The control method for improving energy recovery of a hybrid vehicle according to claim 1, characterized in that: Determine whether the hybrid vehicle enters the energy recovery mode, including: When the hybrid vehicle is in a braking state or a coasting state, the hybrid vehicle is controlled to enter a corresponding energy recovery mode. After the hybrid vehicle enters the corresponding energy recovery mode, if it is detected that the current vehicle speed is less than a preset speed, the vehicle is controlled to exit the energy recovery mode.

3. The control method for improving energy recovery of a hybrid vehicle according to claim 2, characterized in that: When the hybrid electric vehicle is in a braking state or a coasting state, controlling the hybrid electric vehicle to enter a corresponding energy recovery mode also includes the following steps: It is determined whether the operating gear, vehicle speed and remaining power of the power battery of the hybrid vehicle meet the preset conditions. If the preset conditions are met and when the hybrid vehicle is in a braking state or a coasting state, the hybrid vehicle is controlled to enter a corresponding energy recovery mode.

4. The control method for improving energy recovery of a hybrid vehicle according to claim 2, characterized in that: When the hybrid electric vehicle is in a braking state or a coasting state, controlling the hybrid electric vehicle to enter a corresponding energy recovery mode includes: When the hybrid vehicle is in a braking state, the hybrid vehicle is controlled to enter a braking energy recovery mode; When the hybrid vehicle is in a coasting state, the hybrid vehicle is controlled to enter a coasting energy recovery mode.

5. The control method for improving energy recovery of a hybrid electric vehicle according to claim 1, characterized in that: Based on the power battery charging time, power battery temperature and remaining power, the target time interval is obtained, including: Based on the charging time of the power battery, the temperature of the power battery and the remaining power, the target time interval is obtained by looking up a table; Based on the power battery temperature, the remaining power, and the total charging time of the power battery, obtaining the maximum allowable charging power of the power battery, including: Based on the power battery temperature, the remaining power and the total charging time of the power battery, obtaining the maximum allowable charging power of the power battery by looking up a table; The external characteristic power value of the driving motor is used as the maximum recovery power of the driving motor, including: The external characteristic power value of the driving motor is obtained by looking up the table, and is used as the maximum recovery power of the driving motor.

6. The control method for improving energy recovery of a hybrid vehicle according to claim 4, characterized in that: Based on the current vehicle speed, the opening degree of the brake pedal and the energy recovery intensity gear, the second recovery power is obtained, including: In the braking condition energy recovery mode, the second recovery power is obtained by looking up the table based on the current vehicle speed, the opening of the brake pedal and the energy recovery intensity gear; In the energy recovery mode of the coasting condition, the second recovery power is obtained by looking up the table based on the current vehicle speed and the energy recovery intensity gear.

7. A control system for improving energy recovery in a hybrid vehicle, characterized in that: include: A judgment module, used to judge whether the hybrid vehicle enters an energy recovery mode; A first obtaining module is used to obtain an actual time interval between a current energy recovery mode and a previous energy recovery mode, and obtain a power battery charging time in the current energy recovery mode, as well as a current power battery temperature and a remaining power, and obtain a target time interval based on the power battery charging time, the power battery temperature and the remaining power; A first comparison module is used to compare the actual time interval with the target time interval. When the actual time interval is greater than the target time interval, the total time of charging the power battery is reset to zero. When the actual time interval is less than or equal to the target time interval, the total time of charging the power battery is the sum of the charging time of the power battery in the current energy recovery mode and the charging time of the power battery in the previous energy recovery mode. a second obtaining module, configured to obtain a maximum allowable charging power of the power battery based on the power battery temperature, the remaining power and the total charging time of the power battery, and use the maximum allowable charging power of the power battery as the first recovery power; A third obtaining module, used for obtaining a second recovery power based on the current vehicle speed, the opening degree of the brake pedal and the energy recovery intensity gear; A fourth obtaining module is used to obtain an external characteristic power value of the driving motor and use it as the third recovery power; The second comparison module is used to compare the first recovery power, the second recovery power and the third recovery power to obtain a minimum value, and use the minimum value as the actual recovery power of the drive motor.

8. The control system for improving energy recovery of a hybrid vehicle according to claim 7, characterized in that: The third acquisition module includes a first acquisition submodule and a second acquisition submodule; The first acquisition submodule is used to obtain the second recovery power by looking up a table based on the current vehicle speed, the opening of the brake pedal and the energy recovery intensity gear in the braking condition energy recovery mode; The second acquisition submodule is used to obtain the second recovery power by looking up a table based on the current vehicle speed and the energy recovery intensity gear in the coasting condition energy recovery mode.

9. A vehicle, characterized in that: It comprises a control system for improving energy recovery of a hybrid vehicle as described in claim 7 or claim 8.

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