CN114030457B - Dual-threshold working mode switching control method for series-parallel hybrid power system - Google Patents
Dual-threshold working mode switching control method for series-parallel hybrid power system Download PDFInfo
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- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
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- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
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- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/13—Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
- B60W20/14—Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion in conjunction with braking regeneration
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- B60W20/00—Control systems specially adapted for hybrid vehicles
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- B60W20/00—Control systems specially adapted for hybrid vehicles
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- B60W2510/00—Input parameters relating to a particular sub-units
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- B60W2540/00—Input parameters relating to occupants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2540/00—Input parameters relating to occupants
- B60W2540/12—Brake pedal position
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
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- B60W2710/06—Combustion engines, Gas turbines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/08—Electric propulsion units
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a switching control method for a dual-threshold working mode of a series-parallel hybrid power system, which divides the working mode into a pure electric driving mode, a pure electric energy recovery mode, a series driving mode, a series energy recovery mode, a parallel driving mode and a parallel energy recovery mode; a mode entering threshold and a mode exiting threshold are set for a pure electric mode, a series mode and a parallel mode, and a double-threshold mode switching control method under a driving working condition and a braking energy recovery working condition and a control method for forcibly entering the parallel mode under a special working condition are designed; the phenomenon that modes are switched back and forth when the vehicle speed fluctuates near the threshold value can be avoided, meanwhile, the maximum braking energy recovery can be realized, in addition, the working intervals of the vehicles under different modes can be reasonably distributed by setting the interval ranges of the two threshold values under different working conditions, and the use requirements of different working conditions are met.
Description
Technical Field
The invention belongs to the technical field of new energy automobiles, and particularly relates to a double-threshold working mode switching control method of a series-parallel hybrid power system.
Background
The hybrid electric vehicle is an important development direction for energy conservation and emission reduction of the automobile industry, and on one hand, the hybrid electric vehicle is provided with a plurality of power sources, and can fully play the working efficiency of different power sources under different working conditions by selecting proper power sources and power transmission paths under different working conditions through mode switching control, and on the other hand, the hybrid electric vehicle can realize the recovery of braking energy and realize the secondary utilization of energy. Therefore, the method can judge and select a proper working mode according to different working conditions, realize the high-efficiency output and energy recovery of power, and is the key content for ensuring the driving performance and the economic performance of the hybrid electric vehicle.
Patent application publication No. CN113320522A discloses a hybrid vehicle working mode switching method, and from the perspective of specific oil consumption of an engine, the working mode with lower oil consumption of the engine in a parallel working mode and a series working mode can be selected to utilize an engine high-efficiency area with the maximum efficiency, so that the oil consumption of the whole vehicle is reduced, and the economic level of the whole vehicle is improved.
Patent application publication No. CN110949368A has defined the whole car mode of hybrid vehicle to confirm target mode according to operating condition information, set up the operating condition threshold value of switching each other between the different modes, nevertheless when the operating condition information of whole car is undulant about the threshold value, can lead to whole car mode to switch back and forth between two kinds of modes, influence whole car driving stability and driving comfort.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a double-threshold working mode switching judgment condition and a double-threshold working mode switching control method of a series-parallel hybrid power system, so that the judgment and switching control of the working mode of a hybrid system are realized, and the full-working-condition driving requirement of a hybrid electric vehicle is met. The specific technical scheme of the invention is as follows:
a switching control method for dual-threshold working modes of a series-parallel hybrid power system comprises three working modes, namely a pure electric mode, a series mode and a parallel mode, wherein,
the pure electric mode comprises a pure electric driving mode and a pure electric braking energy recovery mode, the series mode comprises a series driving mode and a series braking energy recovery mode, and the parallel mode comprises a parallel driving mode and a parallel braking energy recovery mode; the pure electric driving mode, the series driving mode and the parallel driving mode are driving modes, and the pure electric braking energy recovery mode, the series braking energy recovery mode and the parallel braking energy recovery mode are braking energy recovery modes;
the setting of a mode determination threshold value, that is, a vehicle speed value, for mode switching control includes: the method comprises the following steps that a pure electric mode entering threshold value and a pure electric mode exiting threshold value, a series mode entering threshold value and a series mode exiting threshold value, a parallel mode entering threshold value and a parallel mode exiting threshold value, different battery SOC states and accelerator pedal opening values correspond to different mode entering threshold value and mode exiting threshold value combinations, working mode requirements are judged and switched through double-threshold mode switching control, and the mode switching control method comprises the following steps:
the steps in the driving mode are as follows:
s1: after the vehicle is started, the vehicle enters a working state, whether the current working condition meets the judgment condition of forcibly entering the parallel mode is judged, if yes, the vehicle directly enters the parallel mode, and if not, the vehicle executes the step S2;
s2: selecting a corresponding mode judgment threshold according to the opening degree of an accelerator pedal and the SOC state of a battery, comparing the current vehicle speed with the mode judgment threshold to judge the control requirement of a driving mode, outputting a control instruction of a pure electric driving mode, a series driving mode or a parallel driving mode, and controlling a corresponding execution element to enter a corresponding mode;
the steps in the braking energy recovery mode are as follows:
step 1: when a brake pedal is stepped on, if the judgment condition of the braking energy recovery mode is met, switching to the braking energy recovery mode;
step 2: and selecting a corresponding mode judgment threshold according to the condition that the opening degree of an accelerator pedal is 0 and the SOC state of the battery, comparing the current vehicle speed with the mode judgment threshold, combining a working mode before a braking energy recovery mode, outputting a control instruction of a pure electric braking energy recovery mode, a series braking energy recovery mode or a parallel braking energy recovery mode, and controlling a corresponding execution element to enter a corresponding mode.
Further, the priority of the working mode is that the parallel mode is the highest, the series mode is the second, and the pure electric mode is the lowest, that is, in the mode judging process, the parallel mode judging condition is judged firstly, if not, the series mode judging condition is judged again, and finally, the pure electric mode judging condition is judged.
Further, in step S1, the determination condition for forcing the parallel mode is: the torque requirement of the whole vehicle is too high, namely the maximum output torque of the driving motor cannot meet the torque requirement of the whole vehicle, the driving motor is forced to enter a parallel mode, and the engine is controlled to output the driving torque so as to meet the driving requirement of the whole vehicle.
Further, in step S2, the method of determining the control demand for the driving mode includes:
s2-1: reading a current battery SOC value and an accelerator pedal opening value, and inquiring a mode judgment threshold value according to the battery SOC value and the accelerator pedal opening value;
s2-2: comparing the current vehicle speed with a parallel mode entering threshold, if the current vehicle speed is higher than the parallel mode entering threshold, meeting a parallel mode entering condition, outputting a parallel driving mode control instruction, and entering a parallel driving mode; if the current vehicle speed is not met, comparing the current vehicle speed with a parallel mode exit threshold, and if the current vehicle speed is higher than the parallel mode exit threshold, keeping the current mode; if the current vehicle speed is lower than the parallel mode exit threshold, exiting the parallel mode judgment, and executing the step S2-3;
s2-3: comparing the current vehicle speed with a series mode entering threshold, if the current vehicle speed is higher than the series mode entering threshold, meeting a series mode entering condition, outputting a series driving mode control instruction, and entering a series driving mode; if the current vehicle speed is not met, comparing the current vehicle speed with a series mode exit threshold, and if the current vehicle speed is higher than the series mode exit threshold, keeping the current mode; if the current vehicle speed is lower than the exit threshold value of the series mode, judging the exit of the series mode, and executing the step S2-4;
s2-4: comparing the current vehicle speed with a pure electric mode entry threshold, if the current vehicle speed is higher than the pure electric mode entry threshold, meeting a pure electric mode entry condition, outputting a pure electric driving mode control instruction, and entering a pure electric driving mode; if the current vehicle speed is not met, comparing the current vehicle speed with the pure electric mode exit threshold, and if the current vehicle speed is higher than the pure electric mode exit threshold, keeping the current mode; and if the current vehicle speed is lower than the pure electric mode exit threshold, exiting the pure electric mode for judgment.
Further, in Step1, the braking energy recovery mode determination condition is: the brake pedal is stepped on and the duration is higher than a set value; the vehicle speed is higher than the set vehicle speed; the current gear is a forward gear; the motor and the battery are in normal working states without driving abnormal conditions; and when the four conditions are met, triggering a braking energy recovery mode.
Further, the process of Step2 is as follows:
step 2-1: the current opening value of the accelerator pedal is 0, the current SOC value is read, and a mode judgment threshold value is inquired;
step 2-2: if the working mode before the braking energy recovery mode is the parallel driving mode, the parallel braking energy recovery mode is firstly entered after the condition of the braking energy recovery mode is met until the vehicle speed is lower than the exit threshold of the parallel mode;
step 2-3: if the SOC of the battery is higher than a set value or the vehicle speed is lower than the exit threshold value of the series mode, entering a pure electric braking energy recovery mode, or else entering the series braking energy recovery mode;
step 2-4: if the working mode before the braking energy recovery mode is the series driving mode, the series braking energy recovery mode is firstly entered after the condition of the braking energy recovery mode is met, and the pure electric braking energy recovery mode is entered until the SOC of the battery is higher than a set value or the vehicle speed is lower than the exit threshold value of the series mode;
step 2-5: if the working mode before the braking energy recovery mode is the pure electric driving mode, directly entering the pure electric braking energy recovery mode after meeting the condition of the braking energy recovery mode until the braking energy recovery mode exits;
under the braking energy recovery mode, the entire vehicle working mode switching mode can be only from the parallel braking energy recovery mode to the series braking energy recovery mode and then to the pure braking energy recovery mode, or from the parallel braking energy recovery mode to the pure braking energy recovery mode directly, and reverse switching cannot be performed.
The invention has the beneficial effects that:
1. the mode switching determination condition and the control method of the series-parallel configuration hybrid power system can determine the mode switching determination condition under the conventional working condition according to the vehicle speed, the opening degree of an accelerator pedal and the SOC state of a battery;
2. the invention considers the judgment condition of the working condition of forcibly entering the parallel mode under the special working condition, and meets the driving requirement of the whole vehicle;
3. according to the invention, the mode entering threshold and the mode exiting threshold are set for the pure electric mode, the series mode and the parallel mode, so that on one hand, the phenomenon that the modes are switched back and forth when the vehicle speed fluctuates up and down near the threshold is avoided, and the driving comfort of the vehicle is improved, on the other hand, by setting the interval ranges of the entering threshold and the exiting threshold under different working conditions, the working intervals of the vehicle under different modes can be reasonably distributed, and the use requirements under different working conditions are met;
4. the invention sets the judgment method of the braking energy recovery mode aiming at the pure electric mode, the series mode and the parallel mode, sets the switching logic of the three braking energy recovery modes, can realize the maximum braking energy recovery and improve the economic performance of the whole vehicle.
Drawings
In order to illustrate embodiments of the present invention or technical solutions in the prior art more clearly, the drawings which are needed in the embodiments will be briefly described below, so that the features and advantages of the present invention can be understood more clearly by referring to the drawings, which are schematic and should not be construed as limiting the present invention in any way, and for a person skilled in the art, other drawings can be obtained on the basis of these drawings without any inventive effort. Wherein:
FIG. 1 is a flow chart of the hybrid system mode switching operation of the present invention;
FIG. 2 is a logic diagram of driving mode determination according to the present invention;
FIG. 3 is a logic diagram for determining a braking energy recovery mode according to the present invention;
fig. 4 is a schematic structural diagram of a series-parallel hybrid system applied in the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
As shown in fig. 4, the series-parallel configuration hybrid system structure comprises a driving motor, a generator, an engine, a clutch, a gear Z1, a gear Z2, a gear Z3, a gear Z4, a gear Z5, a gear Z6 and a differential, wherein the gear Z1 is meshed with the gear Z2, the gear Z3 is meshed with the gear Z4, the gear Z5 is meshed with the gear Z6, the gear Z2, the gear Z4 and the gear Z5 are coaxial, the driving motor is connected with the gear Z3, the engine is connected with the generator, the generator is connected with the gear Z1 through the clutch, and the gear Z6 is connected with the differential as a power output gear.
As shown in fig. 1-3, a method for controlling switching between dual threshold operating modes of a series-parallel hybrid power system includes three operating modes, i.e. a pure electric mode, a series mode and a parallel mode, wherein,
the pure electric mode comprises a pure electric driving mode and a pure electric braking energy recovery mode, the series mode comprises a series driving mode and a series braking energy recovery mode, and the parallel mode comprises a parallel driving mode and a parallel braking energy recovery mode; the pure electric driving mode, the series driving mode and the parallel driving mode are driving modes, and the pure electric braking energy recovery mode, the series braking energy recovery mode and the parallel braking energy recovery mode are braking energy recovery modes; the modes are specifically as follows:
pure electric driving mode: the whole vehicle is driven by only the driving motor to provide kinetic energy, the generator and the engine do not participate in working, and the clutch is in a separation state;
pure electric braking energy recovery mode: when only the driving motor is in a working state, the braking energy is recovered, at the moment, the driving motor is in a power generation mode, the generator and the engine do not participate in working, and the clutch is in a separation state;
series driving mode: the whole vehicle is driven by a driving motor to provide kinetic energy, and meanwhile, an engine drives a generator to rotate to generate electric energy for driving the motor to work; the engine is only used for generating power by the generator, and does not participate in the driving of the whole vehicle, and the clutch is in a separation state;
recovering the series braking energy: the driving motor is in a working state, meanwhile, the engine drives the generator to recover braking energy in the power generation process, at the moment, the braking energy is recovered by the driving motor, the driving motor is in a power generation mode, the working states of the generator and the engine and a series driving mode are kept unchanged, and the clutch is in a separation state;
parallel driving mode: the whole vehicle is driven by the driving motor and the engine to provide kinetic energy at the same time, at the moment, the clutch is in a closed state, and the engine is coupled with the driving motor through the clutch and acts on a transmission system together; the generator can be driven by the engine to generate power according to the driving requirement of the whole vehicle, and can also be used as a second driving motor to participate in the driving of the whole vehicle;
parallel braking energy recovery mode: the engine and the driving motor are coupled through the clutch to recover braking energy, the braking energy is firstly recovered by the driving motor, and the braking energy can also be recovered by the driving motor and the generator together according to the control requirement of the whole vehicle; at the moment, the engine only serves as a load to output negative torque, and the clutch is in a closed state;
the setting of a mode determination threshold value, that is, a vehicle speed value, for mode switching control includes: the method comprises the following steps that a pure electric mode entering threshold value and a pure electric mode exiting threshold value, a series mode entering threshold value and a series mode exiting threshold value, a parallel mode entering threshold value and a parallel mode exiting threshold value, different battery SOC states and accelerator pedal opening values correspond to different mode entering threshold value and mode exiting threshold value combinations, working mode requirements are judged and switched through double-threshold mode switching control, and the mode switching control method comprises the following steps:
the steps in the driving mode are as follows:
s1: after the vehicle is started, the vehicle enters a working state, whether the current working condition meets the judgment condition of forcibly entering the parallel mode is judged, if yes, the vehicle directly enters the parallel mode, and if not, the vehicle executes the step S2;
s2: selecting a corresponding mode judgment threshold according to the opening degree of an accelerator pedal and the SOC state of a battery, comparing the current vehicle speed with the mode judgment threshold to judge the control requirement of a driving mode, outputting a control instruction of a pure electric driving mode, a series driving mode or a parallel driving mode, and controlling a corresponding execution element to enter a corresponding mode;
the steps in the braking energy recovery mode are as follows:
step 1: when a brake pedal is stepped on, if the judgment condition of the braking energy recovery mode is met, switching to the braking energy recovery mode;
step 2: and selecting a corresponding mode judgment threshold according to the condition that the opening degree of an accelerator pedal is 0 and the SOC state of the battery, comparing the current vehicle speed with the mode judgment threshold, combining a working mode before a braking energy recovery mode, outputting a control instruction of a pure electric braking energy recovery mode, a series braking energy recovery mode or a parallel braking energy recovery mode, and controlling a corresponding execution element to enter a corresponding mode.
In some embodiments, the priority of the operating mode is the highest in the parallel mode, the second in the series mode, and the lowest in the pure electric mode, that is, in the mode determination process, the parallel mode determination condition is determined first, if not, the series mode determination condition is determined, and finally, the pure electric mode determination condition is determined.
In some embodiments, in step S1, the determination condition for forcing to enter the parallel mode is: the torque requirement of the whole vehicle is too high, namely the maximum output torque of the driving motor cannot meet the torque requirement of the whole vehicle, the driving motor is forced to enter a parallel mode, and the engine is controlled to output the driving torque so as to meet the driving requirement of the whole vehicle.
As shown in fig. 2, in some embodiments, the method of determining the control demand of the driving drive mode in step S2 is:
s2-1: reading a current battery SOC value and an accelerator pedal opening value, and inquiring a mode judgment threshold value according to the battery SOC value and the accelerator pedal opening value;
s2-2: comparing the current vehicle speed with a parallel mode entering threshold, if the current vehicle speed is higher than the parallel mode entering threshold, meeting a parallel mode entering condition, outputting a parallel driving mode control instruction, and entering a parallel driving mode; if the current vehicle speed is not met, comparing the current vehicle speed with a parallel mode exit threshold, and if the current vehicle speed is higher than the parallel mode exit threshold, keeping the current mode; if the current vehicle speed is lower than the parallel mode exit threshold, exiting the parallel mode judgment, and executing the step S2-3;
s2-3: comparing the current vehicle speed with a series mode entering threshold, if the current vehicle speed is higher than the series mode entering threshold, meeting a series mode entering condition, outputting a series driving mode control instruction, and entering a series driving mode; if the current vehicle speed is not met, comparing the current vehicle speed with a series mode exit threshold, and if the current vehicle speed is higher than the series mode exit threshold, keeping the current mode; if the current vehicle speed is lower than the exit threshold value of the series mode, judging the exit of the series mode, and executing the step S2-4;
s2-4: comparing the current vehicle speed with a pure electric mode entry threshold, if the current vehicle speed is higher than the pure electric mode entry threshold, meeting a pure electric mode entry condition, outputting a pure electric driving mode control instruction, and entering a pure electric driving mode; if the current vehicle speed is not met, comparing the current vehicle speed with the pure electric mode exit threshold, and if the current vehicle speed is higher than the pure electric mode exit threshold, keeping the current mode; and if the current vehicle speed is lower than the pure electric mode exit threshold, exiting the pure electric mode for judgment.
As shown in fig. 3, in some embodiments, in Step1, the determination condition of the braking energy recovery mode is: the brake pedal is stepped on and the duration is higher than a set value; the vehicle speed is higher than the set vehicle speed; the current gear is a forward gear; the motor and the battery are in normal working states without driving abnormal conditions; and when the four conditions are met, triggering a braking energy recovery mode.
In some embodiments, the process of Step2 is:
step 2-1: the current opening value of the accelerator pedal is 0, the current SOC value is read, and a mode judgment threshold value is inquired;
step 2-2: if the working mode before the braking energy recovery mode is the parallel driving mode, the parallel braking energy recovery mode is firstly entered after the condition of the braking energy recovery mode is met until the vehicle speed is lower than the exit threshold of the parallel mode;
step 2-3: if the SOC of the battery is higher than a set value or the vehicle speed is lower than the exit threshold value of the series mode, entering a pure electric braking energy recovery mode, or else entering the series braking energy recovery mode;
step 2-4: if the working mode before the braking energy recovery mode is the series driving mode, the series braking energy recovery mode is firstly entered after the condition of the braking energy recovery mode is met, and the pure electric braking energy recovery mode is entered until the SOC of the battery is higher than a set value or the vehicle speed is lower than the exit threshold value of the series mode;
step 2-5: if the working mode before the braking energy recovery mode is the pure electric driving mode, directly entering the pure electric braking energy recovery mode after meeting the condition of the braking energy recovery mode until the braking energy recovery mode exits;
under the braking energy recovery mode, the entire vehicle working mode switching mode can be only from the parallel braking energy recovery mode to the series braking energy recovery mode and then to the pure braking energy recovery mode, or from the parallel braking energy recovery mode to the pure braking energy recovery mode directly, and reverse switching cannot be performed.
For the convenience of understanding the above technical aspects of the present invention, the following detailed description will be given of the above technical aspects of the present invention by way of specific examples.
Example 1
Table 1 shows the setting of the entry threshold and the exit threshold for three modes at a certain accelerator pedal opening, an SOC of 60% and an SOC of 20%. When the SOC =60%, the battery electric quantity is sufficient and belongs to a high SOC working condition, and when the SOC =20%, the battery electric quantity is insufficient and belongs to a low SOC working condition.
TABLE 1 Accelerator pedal opening degree, different mode entry and exit thresholds under different working conditions
When the SOC =60%, in the vehicle acceleration process, according to the judging method shown in FIG. 2, when the vehicle speed interval is between 0 and 60km/h, the mode is the pure electric mode; when the vehicle speed exceeds 60km/h but is lower than 70km/h, the vehicle is in a series mode; when the vehicle speed is higher than 70km/h, the parallel mode is adopted; in the process of vehicle deceleration, when the vehicle speed is higher than 70km/h, the parallel mode is adopted; when the vehicle speed is 65-70km/h, the current mode is kept and the parallel mode is adopted; when the vehicle speed is 60-65 km/h, the vehicle is in a series mode; when the vehicle speed is 55-60km/h, the current mode is kept and the current mode is a series mode; and when the vehicle speed is lower than 55km/h, the pure electric mode is adopted.
When the SOC =20%, when the vehicle accelerates to 15km/h, namely the pure electric mode is switched to the series mode, and the vehicle accelerates to 60km/h under the working condition of SOC =60% and then is switched to the series mode, the mode switching control method can realize that the pure electric mode interval is reduced under the working condition of low SOC, the series mode interval is increased, the engine is started to generate electricity as soon as possible, the power requirement of the motor is met, the pure electric mode use interval is expanded as far as possible under the working condition of high SOC through setting different threshold values, and the driving performance of the motor at low speed is fully exerted; by setting the range of the entering threshold and the exiting threshold under different working conditions, the working ranges of the vehicle under different modes can be reasonably distributed, and the use requirements under different working conditions are met.
On the other hand, compared with a single threshold judgment method, the mode switching control method can effectively avoid the mode switching phenomenon when the vehicle speed fluctuates up and down near the threshold, and improves the driving comfort of the vehicle; taking the high SOC working condition shown in the table 1 as an example, when the vehicle speed is accelerated to 55-60km/h in the pure electric mode, the current mode is kept to be the pure electric mode, and when the vehicle speed exceeds 60km/h, the mode is switched to the series mode; at the moment, if the vehicle speed is reduced to the range of 55-60km/h again, the current mode is kept to be the series mode, and the pure electric mode is not switched until the vehicle speed is reduced to be below 55 km/h. And similarly, if the vehicle speed is increased to the range of 55-60km/h again at the moment, the current mode is kept as the pure electric mode. Therefore, the method can effectively avoid the phenomenon that the working mode is switched back and forth along with the fluctuation of the vehicle speed up and down near the threshold value, and ensures the stability of the working mode and the driving comfort.
TABLE 2 entry and exit thresholds for different modes at different accelerator pedal opening under certain SOC conditions
Table 2 shows the setting conditions of mode determination thresholds under different accelerator pedal opening degrees under the same SOC operating condition, in which the torque demand of the entire vehicle when the accelerator pedal opening degree is 80% is considered to be higher than the torque demand when the accelerator pedal opening degree is 20%, and the battery capacity and the motor torque output capacity are considered to be limited, so that when the accelerator pedal opening degree is 80%, the operating range of the parallel mode needs to be expanded to start the engine as soon as possible, and the torque demand of the entire vehicle is met.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A switching control method for dual-threshold working modes of a series-parallel hybrid power system is characterized by comprising three working modes, namely a pure electric mode, a series mode and a parallel mode, wherein,
the pure electric mode comprises a pure electric driving mode and a pure electric braking energy recovery mode, the series mode comprises a series driving mode and a series braking energy recovery mode, and the parallel mode comprises a parallel driving mode and a parallel braking energy recovery mode; the pure electric driving mode, the series driving mode and the parallel driving mode are driving modes, and the pure electric braking energy recovery mode, the series braking energy recovery mode and the parallel braking energy recovery mode are braking energy recovery modes;
the setting of a mode determination threshold value, that is, a vehicle speed value, for mode switching control includes: the method comprises the following steps that a pure electric mode entering threshold value and a pure electric mode exiting threshold value, a series mode entering threshold value and a series mode exiting threshold value, a parallel mode entering threshold value and a parallel mode exiting threshold value, different battery SOC states and accelerator pedal opening values correspond to different mode entering threshold value and mode exiting threshold value combinations, working mode requirements are judged and switched through double-threshold mode switching control, and the mode switching control method comprises the following steps:
the steps in the driving mode are as follows:
s1: after the vehicle is started, the vehicle enters a working state, whether the current working condition meets the judgment condition of forcibly entering the parallel mode is judged, if yes, the vehicle directly enters the parallel mode, and if not, the vehicle executes the step S2;
wherein, the judgment condition for forcing to enter the parallel mode is as follows: the torque demand of the whole vehicle is too high, namely the maximum output torque of the driving motor cannot meet the torque demand of the whole vehicle, the driving motor is forced to enter a parallel mode, and the engine is controlled to output the driving torque so as to meet the driving demand of the whole vehicle;
s2: selecting a corresponding mode judgment threshold according to the opening degree of an accelerator pedal and the SOC state of a battery, comparing the current vehicle speed with the mode judgment threshold to judge the control requirement of a driving mode, outputting a control instruction of a pure electric driving mode, a series driving mode or a parallel driving mode, and controlling a corresponding execution element to enter a corresponding mode;
the method for judging the control requirement of the driving mode comprises the following steps:
s2-1: reading a current battery SOC value and an accelerator pedal opening value, and inquiring a mode judgment threshold value according to the battery SOC value and the accelerator pedal opening value;
s2-2: comparing the current vehicle speed with a parallel mode entering threshold, if the current vehicle speed is higher than the parallel mode entering threshold, meeting a parallel mode entering condition, outputting a parallel driving mode control instruction, and entering a parallel driving mode; if the current vehicle speed is not met, comparing the current vehicle speed with a parallel mode exit threshold, and if the current vehicle speed is higher than the parallel mode exit threshold, keeping the current mode; if the current vehicle speed is lower than the parallel mode exit threshold, exiting the parallel mode judgment, and executing the step S2-3;
s2-3: comparing the current vehicle speed with a series mode entering threshold, if the current vehicle speed is higher than the series mode entering threshold, meeting a series mode entering condition, outputting a series driving mode control instruction, and entering a series driving mode; if the current vehicle speed is not met, comparing the current vehicle speed with a series mode exit threshold, and if the current vehicle speed is higher than the series mode exit threshold, keeping the current mode; if the current vehicle speed is lower than the exit threshold value of the series mode, judging the exit of the series mode, and executing the step S2-4;
s2-4: comparing the current vehicle speed with a pure electric mode entry threshold, if the current vehicle speed is higher than the pure electric mode entry threshold, meeting a pure electric mode entry condition, outputting a pure electric driving mode control instruction, and entering a pure electric driving mode; if the current vehicle speed is not met, comparing the current vehicle speed with the pure electric mode exit threshold, and if the current vehicle speed is higher than the pure electric mode exit threshold, keeping the current mode; if the current vehicle speed is lower than the pure electric mode exit threshold, then the pure electric mode is exited for judgment;
the steps in the braking energy recovery mode are as follows:
step 1: when a brake pedal is stepped on, if the judgment condition of the braking energy recovery mode is met, switching to the braking energy recovery mode;
step 2: and selecting a corresponding mode judgment threshold according to the condition that the opening degree of an accelerator pedal is 0 and the SOC state of the battery, comparing the current vehicle speed with the mode judgment threshold, combining a working mode before a braking energy recovery mode, outputting a control instruction of a pure electric braking energy recovery mode, a series braking energy recovery mode or a parallel braking energy recovery mode, and controlling a corresponding execution element to enter a corresponding mode.
2. The switching control method according to claim 1, wherein the priority of the working mode is the highest parallel mode, the second serial mode and the lowest pure electric mode, that is, in the mode determination process, the parallel mode determination condition is determined first, if not, the serial mode determination condition is determined again, and finally, the pure electric mode determination condition is determined.
3. The switching control method according to claim 1 or 2, wherein in Step1, the judgment condition of the braking energy recovery mode is: the brake pedal is stepped on and the duration is higher than a set value; the vehicle speed is higher than the set vehicle speed; the current gear is a forward gear; the motor and the battery are in normal working states without driving abnormal conditions; and when the four conditions are met, triggering a braking energy recovery mode.
4. The handover control method according to claim 1 or 2, wherein the Step2 includes:
step 2-1: the current opening value of the accelerator pedal is 0, the current SOC value is read, and a mode judgment threshold value is inquired;
step 2-2: if the working mode before the braking energy recovery mode is the parallel driving mode, the parallel braking energy recovery mode is firstly entered after the condition of the braking energy recovery mode is met until the vehicle speed is lower than the exit threshold of the parallel mode;
step 2-3: if the SOC of the battery is higher than a set value or the vehicle speed is lower than the exit threshold value of the series mode, entering a pure electric braking energy recovery mode, or else entering the series braking energy recovery mode;
step 2-4: if the working mode before the braking energy recovery mode is the series driving mode, the series braking energy recovery mode is firstly entered after the condition of the braking energy recovery mode is met, and the pure electric braking energy recovery mode is entered until the SOC of the battery is higher than a set value or the vehicle speed is lower than the exit threshold value of the series mode;
step 2-5: if the working mode before the braking energy recovery mode is the pure electric driving mode, directly entering the pure electric braking energy recovery mode after meeting the condition of the braking energy recovery mode until the braking energy recovery mode exits;
under the braking energy recovery mode, the entire vehicle working mode switching mode can be only from the parallel braking energy recovery mode to the series braking energy recovery mode and then to the pure braking energy recovery mode, or from the parallel braking energy recovery mode to the pure braking energy recovery mode directly, and reverse switching cannot be performed.
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