A Power Reservation Method, Storage Medium and System for Hybrid Electric Vehicles Based on Power Priority

Abstract

The present invention provides a power reservation method, a storage medium and a system for a hybrid vehicle based on power priority. The power reservation method determines the current hybrid mode of the vehicle according to the engine state and the clutch state of the current hybrid vehicle, and then determines the current working condition of the vehicle according to the operating states of the generator and the drive motor. Based on the obtained hybrid mode and current working condition of the vehicle, the input and output powers of the vehicle are classified and the power priorities are sorted. Finally, according to the hybrid mode of the vehicle, the current working condition of the vehicle and the power priority sorting, a power reservation scheme is determined, and the power reservation values are calculated respectively. The power reservation method satisfies the power requests with higher priorities such as those related to driving safety, and at the same time does not cause sudden changes in vehicle power due to power requests with higher priorities. The power reservation method also satisfies the power limitations of various components of the vehicle drive system and does not cause overcharging or over-discharging of the battery.

Description

Technical Field

[0001] The present invention relates to the field of hybrid electric vehicles, and particularly to a power reservation method, a storage medium and a system for a hybrid electric vehicle based on power priority. Background Art

[0002] With the increasing global environmental problems and the policy guidance of energy conservation and emission reduction in China, new energy vehicles have achieved remarkable development. Compared with pure electric vehicles, hybrid electric vehicles do not have range anxiety, so they have received extensive attention. Hybrid electric vehicles usually include multiple systems such as engines, motors, gearboxes, and batteries, and can achieve switching between multiple hybrid modes such as pure electric, series, and parallel through different system combinations. However, due to the differences in output characteristics between different modes of hybrid electric vehicles, their control logic is relatively complex. When the mode of a hybrid electric vehicle is switched, if the power distribution is unreasonable when multiple power sources are switched, problems such as affecting the vehicle's power performance and economy are likely to occur, and even the service life of the battery or driving safety may be affected. Reasonable distribution and coordination of the power of each power source will effectively avoid problems such as power loss and overcharging / overdischarging of the battery that may occur during the switching of each mode.

[0003] Currently, there is no relevant power reservation scheme for hybrid electric vehicles in the Chinese patent publication literature. The known power distribution solutions in the industry include: 1. When multiple power sources are switched, power distribution is achieved by the power request timing sequence, and the maximum input and output power limits of the system are satisfied. 2. When multiple power sources are switched, according to the pre-set power priority comparison, power requests with lower priority are restricted to satisfy higher power priority requests. 3. When multiple power sources are switched, the current power request is satisfied, and the shortest time allowed to exceed the system's allowable input and output power limits is set.

[0004] All of these three solutions have certain drawbacks. In the first solution, when the power request related to driving safety is ranked in a relatively late timing sequence, it is possible that this part of the power request cannot be satisfied, resulting in driving safety problems. The second solution may cause a sudden change in power performance due to restricting power requests with lower priority, affecting the driving experience. The third solution may exceed the system's maximum output and input power limits for a short time, resulting in overcharging / overdischarging of the battery and affecting the battery life. Summary of the Invention

[0005] The object of the present invention is to provide a power reservation method, a storage medium and a system for a hybrid electric vehicle based on power priority to solve the problems existing in the above solutions, and it relates to a hybrid electric vehicle with a generator plus P1+P3 dual-motor hybrid configuration.

[0006] The present invention proposes a power reservation method for a hybrid electric vehicle based on power priority, including the following steps:

[0007] Step S1: Determine the vehicle's hybrid mode based on the engine state and clutch state. The vehicle's hybrid mode includes pure electric mode, series mode, and parallel mode.

[0008] Step S2: Based on the vehicle's hybrid mode obtained in Step S1, determine the vehicle's current working condition according to the operating states of the generator and the drive motor. The vehicle's current working condition includes pure electric drive condition, pure electric recovery condition, series charge and drive condition, series charge and recovery condition, parallel charge and drive condition, parallel charge and recovery condition, and special condition.

[0009] Step S3: Classify the input and output power of the vehicle, and perform power priority ranking based on the vehicle's hybrid mode obtained in Step S1 and the vehicle's current working condition obtained in Step S2.

[0010] Step S4: Determine the power reservation plan according to the vehicle's hybrid mode, vehicle's current working condition, and power priority ranking, and calculate the power reservation value respectively.

[0011] In one embodiment, the method for determining the vehicle's hybrid mode includes:

[0012] If the engine is in a stopped state, the vehicle is in pure electric mode.

[0013] If the engine starts and the clutch is in a disengaged state, the vehicle is in series mode.

[0014] If the engine starts and the clutch is in an engaged state, the vehicle is in parallel mode.

[0015] In one embodiment, the method for determining the vehicle's current specific working condition includes:

[0016] When the vehicle is in pure electric mode;

[0017] If the actual torque of the drive motor is greater than 0, the vehicle is in pure electric drive condition.

[0018] If the actual torque of the drive motor is less than 0, the vehicle is in pure electric recovery condition.

[0019] And / or

[0020] When the vehicle is in series mode;

[0021] If the actual torque of the generator is less than 0 and the actual torque of the drive motor is greater than 0, it is in series charge and drive condition.

[0022] If the actual torque of the generator is less than 0 and the actual torque of the drive motor is less than 0, it is in series charge and recovery condition.

[0023] And / or

[0024] When the vehicle is in parallel mode;

[0025] If the actual torque of the generator is less than 0 and the actual torque of the drive motor is less than 0, it is in the parallel charge replenishment and recovery working condition;

[0026] If the actual torque of the generator is less than 0 and the actual torque of the drive motor is greater than 0, it is in the parallel charge replenishment and drive working condition.

[0027] In one embodiment, when the vehicle is in any of the above working conditions, if the driver requests a sudden acceleration, and / or the generator set composed of the engine and the generator fails to generate electricity, it is in a special working condition.

[0028] In one embodiment, the classification of the input and output power of the vehicle in step S3 includes: the necessary power P of low-voltage accessories minDCDC , the necessary power P of safety defrosting and defogging mindefrost , the maximum allowable current drive power P of the vehicle maxdrive , the maximum discharge power P of the battery batmaxdisc , the maximum output power P of the generator EM1maxoutp , the maximum output power P of the drive motor EM2maxoutp , the reserved power P for engine starting ENGstr , the comfort air-conditioning power P climate , the maximum allowable energy recovery power P of the drive motor EM2maxinp , the engine power P ENG , the maximum power generation power P of the generator EM1maxinp , the charging power P to maintain the battery charge balance soc , the reserved speed regulation power generation power of the generator when switching from series to parallel mode EM1seri2prl , the power generation power P of the engine and the generator set ENGEM1char , the reserved speed regulation power generation power of the generator when switching from parallel to series mode EM1prl2seri and the driver demand drive power P drivereq .

[0029] In one embodiment, the power priority ranking in step S3 includes:

[0030] When the vehicle is in the pure electric drive working condition, the output power priority ranking is the necessary power of low-voltage accessories, the necessary power of safety defrosting and defogging > the reserved power for engine starting > the comfort air-conditioning power, the drive power; and / or

[0031] When the vehicle is in the pure electric recovery working condition, the energy recovery power of the drive motor is the highest priority of the input power; and / or

[0032] When the vehicle is in the series charge replenishment and drive working condition, the output power priority ranking is the necessary power of low-voltage accessories, the necessary power of safety defrosting and defogging > the comfort air-conditioning power, the drive power; and / or

[0033] When the vehicle is in the series charge replenishment and recovery working condition, the input power priority order is: the charging power for maintaining the battery charge balance > the speed regulation power generation power of the generator when switching from series to parallel mode > the energy recovery power of the drive motor; and / or

[0034] When the vehicle is in the parallel charge replenishment and drive working condition, the output power priority order is: the necessary power of low-voltage accessories, the necessary power request for safety defrosting and defogging > the power of the generator set for maintaining the battery charge balance > the power request of the comfort air conditioner, the drive power request; and / or

[0035] When the vehicle is in the parallel charge replenishment and recovery working condition, the input power priority order is: the generator speed regulation input power > the drive motor energy recovery power.

[0036] In one embodiment, in the power priority order, when the vehicle is in any of the above working conditions;

[0037] If a special working condition is recognized, then the drive power priority > the comfort air conditioner priority;

[0038] If a special working condition is not recognized, then the comfort air conditioner power priority > the drive power priority.

[0039] In one embodiment, determining the power reservation scheme and calculating the power reservation value in step S4 includes:

[0040] When the vehicle is in the pure electric drive working condition;

[0041] If no special working condition occurs, then the maximum allowable drive power P maxdrive = MIN(P EM2maxoutp , P batmaxdisc - P minDCDC - P mindefrost - P ENGstr - P climate );

[0042] If a special working condition occurs, then the allowable comfort air conditioner power P climate = MIN(P EM2maxoutp , P batmaxdisc - P minDCDC - P mindefrost - P ENGstr - P drivereq );

[0043] Wherein, P minDCDC , P mindefrost , P ENGstr are reserved powers;

[0044] and / or

[0045] When the vehicle is in the pure electric energy recovery mode;

[0046] The maximum allowable energy recovery power P of the drive motor EM2maxinp is equal to the maximum chargeable power P of the battery batmaxchar ;

[0047] and / or

[0048] When the vehicle is in the series charging drive mode;

[0049] If no special conditions occur, the maximum allowable drive power P of the vehicle maxdrive = MIN{P EM2maxoutp , MIN(P EM1maxinp , P ENG ) + P batmaxdisc - P minDCDC - P mindefrost - P climate};

[0050] If special conditions occur, the allowable comfort air - conditioning power P of the vehicle climate = MIN(P EM2maxoutp , MIN(P EM1maxinp , P ENG ) + P batmaxdisc - P minDCDC - P mindefrost - P ENGstr - P drivereq );

[0051] where P minDCDC , P mindefrost , P ENGstr are reserved powers;

[0052] and / or

[0053] When the vehicle is in the series charging and energy recovery mode, the maximum allowable energy recovery power P of the drive motor EM2maxinp = P batmaxchar - P soc - P EM1seri2prl ;

[0054] where P EM1seri2prl is the reserved power, which can be calculated from the difference between the actual speed S of the generator EM1rpm and the actual speed S of the drive motor EM2rpm ; P soc is the battery charge balance charging power, which can be calculated from the difference between the current state of charge SOC of the battery act and the target balanced state of charge SOC of the battery trg ;

[0055] and / or

[0056] When the vehicle is in the parallel charge drive condition;

[0057] If no special condition occurs, the maximum allowable drive power P of the vehicle maxdrive = P batmaxdisc + P ENG - P minDCDC - P mindefrost - P climate - P soc ;

[0058] If a special condition occurs, the allowable comfort air-conditioning power P of the vehicle climate = P batmaxdisc + P ENG - P minDCDC - P mindefrost - P drivereq - P soc ;

[0059] And / or

[0060] When the vehicle is in the parallel charge recovery condition, the maximum energy recovery power P of the drive motor EM2maxinp = P batmaxchar - P EM1prl2seri ;

[0061] Wherein, P EM1prl2seri is the reserved power, which can be calculated by the difference between the actual speed S of the generator EM1rpm and the actual speed S of the drive motor EM2rpm .

[0062] To achieve the above object, the present invention provides a power reservation system for a hybrid vehicle based on power priority, including a memory and a processor. The memory is used to store computer programs. The processor is used to implement a power reservation method for a hybrid vehicle based on power priority when executing the computer programs.

[0063] To achieve the above object, the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, a power reservation method for a hybrid vehicle based on power priority is implemented.

[0064] The present invention has the following beneficial effects:

[0065] 1. The present invention can ensure high-priority power requests related to driving safety according to power priority, which is beneficial to driving safety.

[0066] 2. The power reservation in the present invention can ensure the corresponding power request without causing a sudden change in the driving feeling due to a sudden change in the drive power.

[0067] 3. The present invention can ensure that the power limits of all components of the system are met, which is beneficial to protecting the service life of the battery and the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 FIG. is a flowchart of a power reservation method for a hybrid vehicle based on power priority according to an embodiment of the present invention. DETAILED DESCRIPTION

[0069] The following describes an embodiment of the present invention in detail with reference to the accompanying drawings. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited thereby.

[0070] The flowchart of the power reservation method for a hybrid vehicle based on power priority according to an embodiment of the present invention is as Figure 1 shown.

[0071] In step S1, the hybrid mode of the vehicle is judged according to the engine state and the clutch state, and the hybrid mode of the vehicle includes a pure electric mode, a series mode, and a parallel mode.

[0072] In step S2, based on the hybrid mode of the vehicle obtained in step S1, the current working condition of the vehicle is judged according to the operating states of the generator and the drive motor, and the current working condition of the vehicle includes a pure electric drive condition, a pure electric recovery condition, a series charge drive condition, a series charge recovery condition, a parallel charge drive condition, a parallel charge recovery condition, and a special condition.

[0073] In step S3, the input and output powers of the vehicle are classified, and the power priority is sorted based on the hybrid mode of the vehicle obtained in step S1 and the current working condition of the vehicle obtained in step S2.

[0074] In step S4, a power reservation scheme is determined according to the hybrid mode of the vehicle, the current working condition of the vehicle, and the power priority sorting, and the power reservation values are calculated respectively.

[0075] In one embodiment, the method for judging the hybrid mode of the vehicle includes:

[0076] If the engine is in a stopped state, the vehicle is in a pure electric mode;

[0077] If the engine is started and the clutch is in a disengaged state, the vehicle is in a series mode;

[0078] If the engine is started and the clutch is in an engaged state, the vehicle is in a parallel mode.

[0079] In one embodiment, the method for judging the current specific working condition includes:

[0080] When the vehicle is in a pure electric mode;

[0081] If the actual torque of the drive motor is greater than 0, the vehicle is in the pure electric drive mode;

[0082] If the actual torque of the drive motor is less than 0, the vehicle is in the pure electric recovery mode;

[0083] and / or

[0084] When the vehicle is in the series mode;

[0085] If the actual torque of the generator is less than 0 and the actual torque of the drive motor is greater than 0, it is in the series charge and drive mode;

[0086] If the actual torque of the generator is less than 0 and the actual torque of the drive motor is less than 0, it is in the series charge and recovery mode;

[0087] and / or

[0088] When the vehicle is in the parallel mode;

[0089] If the actual torque of the generator is less than 0 and the actual torque of the drive motor is greater than 0, it is in the parallel charge and drive mode;

[0090] If the actual torque of the generator is less than 0 and the actual torque of the drive motor is less than 0, it is in the parallel charge and recovery mode.

[0091] In one embodiment, when the vehicle is in any of the above conditions, if the driver makes a sudden acceleration request, that is, when it is determined that the opening of the accelerator pedal is greater than a certain value X1 and the change rate of the opening of the accelerator pedal is greater than a certain value X2, and / or when a power generation failure occurs in the generator set composed of the engine and the generator, it is in a special condition. Otherwise, it is not in a special condition.

[0092] In one embodiment, the classification of the input and output power of the vehicle in step S3 includes: the necessary power P of low-voltage accessories minDCDC , the necessary power P of safety defrosting and defogging mindefrost , the maximum allowable drive power P of the vehicle at present maxdrive , the maximum dischargeable power P of the battery batmaxdisc , the maximum output power P of the generator EM1maxoutp , the maximum output power P of the drive motor EM2maxoutp , the reserved engine start power P ENGstr , the comfort air-conditioning power P climate , the maximum allowable energy recovery power P of the drive motor EM2maxinp , the engine power P ENG , the maximum power generation power P of the generator EM1maxinp , the charging power P to maintain the battery charge balance soc , the reserved speed regulation and power generation power of the generator when switching from series to parallel mode P EM1seri2prl, the power generation power P of the engine and the generator set ENGEM1char , the reserved power P for speed regulation power generation of the generator when switching from parallel to series mode EM1prl2seri , the driver demand drive power P drivereq .

[0093] In one embodiment, the power priority ranking in step S3 includes:

[0094] (a) When the vehicle is in pure electric drive mode, the engine is not started, and the battery supplies power to the drive motor to drive the vehicle. At this time, the battery is the only power source, and its output power limit needs to be considered. At the same time, it is necessary to ensure that the engine can be started smoothly in pure electric mode. Therefore, the output power priority ranking is: ① The necessary power of low-voltage accessories, the necessary power of safety defrosting and defogging power > ② The reserved power for engine start > ③ The comfort air-conditioning power, the drive power.

[0095] (b) When the vehicle is in pure electric recovery mode, the only source of the battery input power is the energy recovery power of the drive motor. At this time, the energy recovery power of the drive motor is the highest priority of the input power. Therefore, the energy recovery power of the drive motor is the highest priority of the input power.

[0096] (c) When the vehicle is in series charge and drive mode, the engine has been started, and the generator set composed of the engine and the generator supplies power to the system, and then the drive motor directly drives the vehicle. At this time, there is no need to consider the engine start power. Therefore, the output power priority ranking is: ① The necessary power of low-voltage accessories, the necessary power of safety defrosting and defogging power > ② The comfort air-conditioning power, the drive power.

[0097] (d) When the vehicle is in series charge and recovery mode, the sources of the system input power include the power generation power of the generator set and the energy recovery power of the drive motor. At this time, it is necessary to consider the speed regulation process when switching from series mode to parallel mode. Therefore, the power generation power of the generator set needs to be divided into the charging power to maintain the battery charge and the generator speed regulation power generation power when switching from series mode to parallel mode. Subject to the allowable charge and discharge power of the power battery of the hybrid vehicle, the input power priority ranking is: ① The charging power to maintain the battery charge balance > ② The generator speed regulation power generation power when switching from series to parallel mode > ③ The energy recovery power of the drive motor.

[0098] (e) When the vehicle is in the parallel charge drive condition, the engine starts and directly drives the vehicle at this time. The generator can charge the battery, and the drive motor can participate in driving and regeneration. At this time, the engine needs to meet the requirements of vehicle driving and maintaining the battery charge balance, and the engine power limit needs to be considered. Therefore, the output power priority order is: ① The necessary power of low-voltage accessories and the necessary power request for safety defrosting and defogging > ② The power of the generator set to maintain the battery charge balance > ③ The power request of the comfort air conditioner and the drive power request.

[0099] (f) When the vehicle is in the parallel charge regeneration condition, it is necessary to consider the dynamic power distribution when stepping on the brake pedal to exit the parallel mode to the series mode to prevent the engine speed from rising rapidly when exiting the parallel mode to the series mode. Therefore, the input power priority order is: ① The input power of the generator speed regulation > ② The energy regeneration power of the drive motor.

[0100] Among them, in all the above conditions, the power priority between the comfort air conditioner power and the drive power needs to be considered at the same time. When a special condition occurs, the drive power priority > the comfort air conditioner priority. Otherwise, the comfort air conditioner power priority > the drive power priority.

[0101] In one embodiment, determining the power reservation scheme and calculating the power reservation value in step S4 includes:

[0102] When the vehicle is in the pure electric drive condition, if no special condition occurs, the formula for calculating the maximum allowable drive power of the vehicle can be expressed as:

[0103] P maxdrive =MIN(P EM2maxoutp ,P batmaxdisc -P minDCDC -P mindefrost -P ENGstr -P climate ) (1)

[0104] If the special condition occurs, the formula for calculating the allowable comfort air conditioner power of the vehicle can be expressed as:

[0105] P climate =MIN(P EM2maxoutp ,P batmaxdisc -P minDCDC -P mindefrost -P ENGstr -P drivereq ) (2)

[0106] Among them, the necessary power of low-voltage accessories is reserved power, which is the sum of the rated powers of low-voltage accessories necessary to maintain vehicle operation. The necessary power for safety defrosting and defogging is reserved power, which is the value calculated by looking up the table according to the ambient temperature. The engine starting power is reserved power. To ensure that the engine can start smoothly under various working conditions, the reserved value of the engine starting power is related to the engine starting torque and the engine starting target speed. The engine starting torque is obtained by looking up the table according to the ambient temperature to compensate for the engine oil stirring resistance at low temperatures. At the same time, when the engine fails to start successfully twice in one driving cycle, a large torque start is adopted. When the vehicle is in motion, to ensure a smooth start process, the engine starting target speed is the same as the series optimal ignition speed; at the same time, when the vehicle is in the catalytic converter heating process, the starting target speed is the catalytic converter heating target speed; when the vehicle is in the cold start process, the starting target speed is the cold start target speed.

[0107] The vehicle repeats the above steps under the following various working conditions.

[0108] When the vehicle is in the pure electric recovery working condition, the maximum allowable energy recovery power P of the drive motor EM2maxinp is equal to the maximum chargeable power P of the battery batmaxchar ;

[0109] P EM2maxinp = P batmaxchar (3)

[0110] When the vehicle is in the series charge drive working condition, if the above-mentioned special working condition does not occur, the formula for calculating the maximum allowable drive power of the vehicle can be expressed as:

[0111] P maxdrive = MIN{P EM2maxoutp , MIN(P EM1maxinp , P ENG ) + P batmaxdisc - P minDCDC - P mindefrost - P climate}(4)

[0112] If the above-mentioned special working condition occurs, the formula for calculating the allowable comfort air-conditioning power of the vehicle can be expressed as:

[0113] P climate = MIN{P EM2maxoutp , MIN(P EM1maxinp , P ENG ) + P batmaxdisc - P minDCDC - P mindefrost - P ENGstr - P drivereq ) (5)

[0114] Among them, P minDCDC 、Pmindefrost , P ENGstr is the reserved power.

[0115] When the vehicle is in the series charge replenishment and recovery working condition, the calculation formula for the maximum allowable energy recovery power of the drive motor can be expressed as:

[0116] P EM2maxinp = P batmaxchar - P soc - P EM1seri2prl (6)

[0117] Among them, P EM1seri2prl is the reserved power, which can be calculated from the difference between the actual speed S EM1rpm of the generator and the actual speed S EM2rpm of the drive motor; Psoc is the battery charge balance charging power, which can be calculated from the difference between the current SOC of the battery (SOC act ) and the target balance SOC (SOC trg ). Formula (6) can be expressed as:

[0118] P EM2maxinp = P batmaxchar - f(SOC act - SOC trg ) - f(S EM1rpm - S EM2rpm ) (7)

[0119] When the vehicle is in the parallel charge replenishment and drive working condition, if the special working condition does not occur, the calculation formula for the maximum allowable drive power of the vehicle can be expressed as:

[0120] P maxdrive = P batmaxdisc + P ENG - P minDCDC - P mindefrost - P climate - P soc (8)

[0121] If the special working condition occurs, the calculation formula for the allowable comfort air-conditioning power of the vehicle can be expressed as:

[0122] P climate = P batmaxdisc + P ENG - P minDCDC - P mindefrost - P drivereq - P soc (9)

[0123] When the vehicle is in the parallel charge replenishment and recovery working condition, the calculation formula for the maximum energy recovery power of the drive motor can be expressed as:

[0124] PEM2maxinp = P batmaxchar -P EM1prl2seri (10)

[0125] where P EM1prl2seri is the reserved power, which is calculated based on the difference between the actual rotational speed S EM1rpm of the generator and the actual rotational speed S EM2rpm of the drive motor. Formula (10) can be expressed as:

[0126] P EM2maxinp = P batmaxchar - f(S EM1rpm - S EM2rpm ) (11)

[0127] The power reservation method for a hybrid electric vehicle based on the power priority of different mode conditions can effectively meet the power requests with higher priorities such as those related to driving safety and vehicle comfort. At the same time, it will not cause sudden changes in vehicle power due to power requests with higher priorities, and it also meets the power limitations of various components of the vehicle drive system and will not cause overcharging or over-discharging of the battery.

[0128] The present invention provides a power reservation system for a hybrid electric vehicle based on power priority, including a memory and a processor. Among them, the memory is used to store computer programs. The processor is used to implement the above-mentioned power reservation method for a hybrid electric vehicle based on power priority when executing the computer program.

[0129] The present invention provides a computer-readable storage medium, including a power driver, a register, and a read-write driver. A computer program is stored on this storage medium, and when the computer program is executed by the processor, it implements the above-mentioned power reservation method for a hybrid electric vehicle based on power priority.

[0130] The above-described embodiments are only further explanations of the present invention and do not impose other forms of limitations on the present invention. The present invention can also have many other embodiments. It should be understood that the term "computer" should be understood in a broad sense and can include, but is not limited to, cloud computing servers, intelligent mobile terminals, Internet of Things devices, computer computers, etc. It should also be understood that the computer-readable storage medium can include, but is not limited to, magnetic storage devices (e.g., hard disks, floppy disks, magnetic strips), optical discs (e.g., compact discs (CDs), digital versatile discs (DVDs)), smart cards, and flash memory devices (e.g., electrically erasable programmable read-only memories (EPROMs), cards, sticks, key drives). In addition, the various storage media described herein can represent one or more devices and / or other machine-readable media for storing information. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding modifications and changes according to the present invention, but these corresponding modifications and changes should all fall within the protection scope of the claims of the present invention.

Claims

1. A power reservation method for a hybrid vehicle based on power priority, characterized in that, Including the following steps: Step S1: Determine the vehicle's hybrid mode based on the engine state and the clutch state. The vehicle's hybrid mode includes pure electric mode, series mode, and parallel mode. Step S2: Based on the vehicle's hybrid mode obtained in Step S1, determine the vehicle's current working condition according to the operating states of the generator and the drive motor. The vehicle's current working condition includes pure electric drive condition, pure electric regeneration condition, series charge and drive condition, series charge and regeneration condition, parallel charge and drive condition, parallel charge and regeneration condition, and special condition. Among them, when the vehicle is in any mode, if the driver requests a sudden acceleration, and / or the generator set composed of the engine and the generator fails to generate electricity, it is in a special condition. Step S3: Classify the input and output power of the vehicle, and perform power priority ranking based on the hybrid mode of the vehicle obtained in Step S1 and the current operating conditions of the vehicle obtained in Step S2. The classification of the input and output power of the vehicle includes: low-voltage accessory necessary power P minDCDC , safety defrosting and defogging power necessary power P mindefrost , maximum allowable current drive power P of the vehicle maxdrive , maximum discharge power P of the battery batmaxdisc , maximum output power P of the generator EM1maxoutp , maximum output power P of the drive motor EM2maxoutp , reserved engine starting power P ENGstr , comfort air-conditioning power P climate , maximum allowable energy recovery power P of the drive motor EM2maxinp , engine power P ENG , maximum power generation power P of the generator EM1maxinp , charging power P to maintain battery charge balance soc , reserved speed regulation power generation power of the generator when switching from series to parallel mode EM1seri2prl , power generation power of the engine and generator set ENGEM1char , reserved speed regulation power generation power of the generator when switching from parallel to series mode EM1prl2seri and driver demand drive power P drivereq ; Step S4: Determine the power reservation plan according to the vehicle's hybrid mode, the vehicle's current working condition, and the power priority ranking, and calculate the power reservation value respectively, including: When the vehicle is in the pure electric drive condition; If no special working conditions occur, then P maxdrive = MIN(P EM2maxoutp , P batmaxdisc - P minDCDC - P mindefrost - P ENGstr - P climate ); If a special working condition occurs, then P climate = MIN(P EM2maxoutp , P batmaxdisc - P minDCDC - P mindefrost - P ENGstr -P drivereq ); Among them, P minDCDC , P mindefrost , P ENGstr are reserved powers; and / or When the vehicle is in the pure electric regeneration condition; P EM2maxinp is equal to the maximum rechargeable power P of the battery batmaxchar ; and / or When the vehicle is in the series charge and drive condition; If no special working conditions occur, then P maxdrive = MIN{P EM2maxoutp , MIN(P EM1maxinp , P ENG ) + P batmaxdisc - P minDCDC - P mindefrost - P climate}; If a special working condition occurs, then P climate = MIN{(P EM2maxoutp , MIN(P EM1maxinp , P ENG ) + P batmaxdisc - P minDCDC - P mindefrost - P ENGstr - P drivereq )}; Among them, P minDCDC , P mindefrost , P ENGstr are reserved powers; and / or When the vehicle is in the series charge replenishment recovery working condition, P EM2maxinp =P batmaxchar - P soc - P EM1seri2prl ; Among them, P EM1seri2prl is the reserved power, which is calculated by the difference between the actual rotational speed S EM1rpm of the generator and the actual rotational speed S EM2rpm of the drive motor; P soc is calculated by the difference between the state of charge SOC act of the current battery and the state of charge SOC trg of the target balanced battery; and / or When the vehicle is in the parallel charge and drive condition; If no special working conditions occur, then P maxdrive = P batmaxdisc + P ENG - P minDCDC - P mindefrost - P climate - P soc ; If special working conditions occur, then P climate = P batmaxdisc + P ENG - P minDCDC - P mindefrost - P drivereq - P soc ; and / or When the vehicle is in the parallel charging and recuperation working condition, P EM2maxinp = P batmaxchar - P EM1prl2seri ; Among them, P EM1prl2seri is the reserved power, which is calculated based on the difference between the actual rotational speed S EM1rpm of the generator and the actual rotational speed S EM2rpm of the drive motor.

2. The power reservation method for a hybrid vehicle based on power priority as described in claim 1, wherein The method for judging the vehicle's hybrid mode in Step S1 includes: If the engine is in the stopped state, the vehicle is in the pure electric mode; If the engine starts and the clutch is in the disengaged state, the vehicle is in the series mode; If the engine starts and the clutch is in the engaged state, the vehicle is in the parallel mode.

3. The power reservation method for a hybrid vehicle based on power priority as described in claim 1, wherein In Step S2, the method for judging the vehicle's current specific working condition includes: When the vehicle is in the pure electric mode; If the actual torque of the drive motor is greater than 0, the vehicle is in the pure electric drive condition; If the actual torque of the drive motor is less than 0, the vehicle is in the pure electric regeneration condition; and / or When the vehicle is in the series mode; If the actual torque of the generator is less than 0 and the actual torque of the drive motor is greater than 0, it is in the series charge and drive condition; If the actual torque of the generator is less than 0 and the actual torque of the drive motor is less than 0, it is in the series charge and regeneration condition; and / or When the vehicle is in the parallel mode; If the actual torque of the generator is less than 0 and the actual torque of the drive motor is greater than 0, it is in the parallel charge and drive condition; If the actual torque of the generator is less than 0 and the actual torque of the drive motor is less than 0, it is in the parallel charge and regeneration condition.

4. The power reservation method for a hybrid electric vehicle based on power priority as claimed in claim 1, wherein The power priority ranking in Step S3 includes: When the vehicle is in the pure electric drive condition, the output power priority ranking is low-voltage accessory necessary power, safety defrosting and demisting power necessary power > engine start reservation power > comfort air-conditioning power, drive power; and / or When the vehicle is in the pure electric regeneration condition, the drive motor energy recovery power is the highest priority for input power; and / or When the vehicle is in the series charge and drive condition, the output power priority ranking is low-voltage accessory necessary power, safety defrosting and demisting power necessary power > comfort air-conditioning power, drive power; and / or When the vehicle is in the series charge and regeneration condition, the input power priority ranking is the charging power to maintain the battery charge balance > the speed regulation power generation of the generator when switching from series to parallel mode > the energy recovery power of the drive motor; and / or When the vehicle is in the parallel charge drive condition, the output power priority order is: the necessary power of low-voltage accessories, the necessary power request for safety defrosting and defogging > the power for the generator set to maintain the battery charge balance > the power request for the comfort air conditioner, the drive power request; and / or When the vehicle is in the parallel charge recovery condition, the input power priority order is: the input power for generator speed regulation > the energy recovery power of the drive motor.

5. The power reservation method for a hybrid electric vehicle based on power priority as described in claim 4, wherein In the said power priority order, when the vehicle is in any one of the working conditions; If a special working condition is recognized, the drive power priority > the comfort air conditioner priority; If a special working condition is not recognized, the comfort air conditioner power priority > the drive power priority.

6. A power reservation system for a hybrid vehicle based on power priority, characterized in that, Including: A memory for storing a computer program; A processor, when executing the said computer program, realizes the power reservation method for a hybrid electric vehicle based on power priority as described in any one of claims 1 to 5.

7. A computer-readable storage medium, characterized in that, A computer program is stored on the said storage medium, and when the computer program is executed by a processor, it realizes the power reservation method for a hybrid electric vehicle based on power priority as described in any one of claims 1 to 5.

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