CN116811831A - Energy stable output control strategy for extended-range power system - Google Patents
Energy stable output control strategy for extended-range power system Download PDFInfo
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- CN116811831A CN116811831A CN202211050589.7A CN202211050589A CN116811831A CN 116811831 A CN116811831 A CN 116811831A CN 202211050589 A CN202211050589 A CN 202211050589A CN 116811831 A CN116811831 A CN 116811831A
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- 238000011217 control strategy Methods 0.000 title claims abstract description 63
- 239000004606 Fillers/Extenders Substances 0.000 claims abstract description 51
- 239000000446 fuel Substances 0.000 claims abstract description 19
- 238000003860 storage Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 3
- 239000000295 fuel oil Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
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- 230000005540 biological transmission Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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Classifications
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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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/12—Recording operating variables ; Monitoring of operating variables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
- B60L50/62—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles charged by low-power generators primarily intended to support the batteries, e.g. range extenders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Automation & Control Theory (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The invention discloses an energy stable output control strategy of a range extender power system, which relates to the technical field of energy output control, and comprises a whole vehicle control strategy and a range extender control strategy, wherein in the whole vehicle control strategy, when the part of the whole vehicle required energy is larger than the output energy of a power battery, the part of the whole vehicle required energy is compensated by the output energy of the range extender, so that the energy requirement of normal running of the vehicle is ensured, and in the range extender control strategy, if the SOC of the power battery is larger than the lower limit value of a charging interval, the whole vehicle runs in a pure electric mode; if the SOC of the power battery is reduced to the lower limit value of the charging interval, opening the range extender, running the whole vehicle in a range extending mode, and determining a control strategy adopted for the engine according to the energy required by the whole vehicle; according to the invention, the reasonable and effective control strategy is formulated, so that the required power of the whole vehicle is optimally distributed between two energy sources, the power performance and the fuel economy of the whole vehicle are improved, the high-efficiency work of the power component is ensured, and the adaptability is strong.
Description
Technical Field
The invention relates to the technical field of energy output control, in particular to an energy stable output control strategy of a range-extending power system.
Background
The range extender is a strategy for completing running control of the whole vehicle by a vehicle controller, mainly appears on vehicles such as a new energy vehicle and the like which use electric power as power, is a transitional vehicle type between a pure electric vehicle and a hybrid electric vehicle, the power system of the new energy vehicle generally comprises a power battery system, a power driving system, a whole vehicle control system and an auxiliary power system, the range extender is more than one range extender, the range extender can treat the vehicle as an engine, but not provides power for the vehicle but provides power for a generator, if the built-in battery of the vehicle is insufficient to provide power for the vehicle, the range extender can start the generator to generate electric energy and then transmit the electric energy to a motor, and finally, the motor generates mechanical energy to drive the vehicle to run, and the range extender electric vehicle can charge the battery directly through the engine, so that compared with other types of new energy vehicles, no extra large charging equipment is required to be built; the vehicle can directly run under pure electric power, the situation of power failure and anchor breaking does not occur, and the manufacturing cost is lower than that of a common pure electric vehicle;
at present, a stable output control strategy for the energy of a range-extending power system is still to be optimized, the power performance and the fuel economy of the whole vehicle are poor, the control and distribution effects on two power sources are poor under the current control strategy, the overall service performance of the vehicle is still to be improved, and in addition, the service life of a battery is further ensured; therefore, we propose an energy stable output control strategy for an extended range power system.
Disclosure of Invention
The main objective of the present invention is to provide an energy stable output control strategy for an extended range power system, so as to solve the above-mentioned problems.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the utility model provides an increase journey driving system energy stable output control strategy, includes whole car control strategy and increases journey ware control strategy, in the whole car control strategy, when the whole car demand energy is greater than the part of power battery output energy by increase journey ware output energy compensate to guarantee the energy demand that the car normally goes, increase journey ware control strategy includes the following step:
s1: when the SOC of the power battery is larger than the lower limit value of the charging interval, the whole vehicle runs in a pure electric mode, and the power battery singly outputs energy in the pure electric mode;
s2: when the SOC of the power battery is reduced to the lower limit value of the charging interval, the range extender is opened, and the whole vehicle operates in a range extending mode;
s3: based on the S2, the step-up device is operated at fixed point or calculated according to the power required by the step-up device under the power following state;
s4: under the fixed-point work of the range extender, the rotating speed of the engine is controlled, and then the torque of the engine is controlled;
s5: under the calculation of the required power according to the range extender, respectively calculating the target rotating speed of the engine and the target torque of the generator;
s6: based on the above S5, engine speed control is achieved by the engine target speed calculation, and generator torque control is achieved by the generator target torque calculation;
s7: and finishing the stable output control of the energy of the extended-range power system.
The energy stable output control strategy comprises a range extender control module and a motor control module, wherein the range extender control module comprises vehicle working mode judgment, engine control and generator control, and the motor control module comprises motor driving control and motor braking control.
In the energy management control strategy formulated by the range extender control module, the working state of the range extender changes along with the change of the running mode of the vehicle, whether the range extender needs to be started or not is judged according to the SOC of the power battery and the size between the required power of the whole vehicle and the maximum discharge power of the power battery, and when the range extender needs to be started, the constant power control strategy or the power following control strategy is decided to be adopted according to the required power of the whole vehicle and the output power of the engine working at the high-efficiency point.
The motor control module judges whether the vehicle is in a driving mode or a braking energy recovery mode according to the detected vehicle speed and pedal signals, and then calculates the output torque of the motor through the input pedal signals.
After the range extender is started, the engine outputs constant power at a preset working point, the output power does not change along with the change of working conditions, the working point comprises an optimal power point and a lowest oil consumption point under the premise of ensuring the dynamic property, and the selection of the working point gives consideration to the fuel consumption, the power and the rotating speed of the engine.
The power following control strategy comprises three-point power following control and curve power following control, wherein the three-point power following control preselects engine power values of three optimal working areas, corresponding working points are determined according to different working condition environments and driving intentions of a driver, the working points of the engine are increased, the curve power following control is that the operation of the engine is changed along a fixed curve, the power values of the engine can be continuously changed, and an engine power curve in the optimal fuel economy is selected as a target following curve.
The curve power following control is determined by the running condition of the vehicle, the characteristic of the engine is known, the required power of the vehicle under the condition of a certain moment, the numerical value of the lowest fuel consumption rate point under the power is determined, and when the SOC value of the storage battery reaches the lowest limit, the engine or the generator set is started and runs along the curve of the lowest fuel consumption rate.
The invention has the following beneficial effects:
the energy stable output control strategy of the extended range power system provided by the invention optimally distributes the required power of the whole vehicle between two energy sources by formulating a reasonable and effective control strategy, improves the power performance and fuel economy of the whole vehicle and ensures the efficient operation of power components.
According to the energy stable output control strategy of the extended range power system, two vehicle-mounted power sources are controlled by proposing a reasonable and effective energy management strategy, so that the energy required by normal running of an automobile is ensured, and the performance of the extended range electric automobile is improved;
meanwhile, the lower limit value of the battery electric quantity falling to the set charge interval when the automobile finishes running is taken as an optimization target, and the model is optimized by reasonably controlling the closing time of the range extender in the running process of the automobile, so that the overdischarge of the power battery is avoided, and the service life of the battery is prolonged.
Drawings
FIG. 1 is a flow chart illustrating the operation of the energy stable output control strategy of the extended range powertrain of the present invention;
FIG. 2 is a schematic diagram of a range extender control strategy flow scheme of the energy stable output control strategy of the range extender power system of the present invention.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
Please refer to fig. 1-2: the utility model provides an increase journey driving system energy stable output control strategy, includes whole car control strategy and increases journey ware control strategy, in the whole car control strategy, when whole car demand energy is greater than the part of power battery output energy by increase journey ware output energy compensate to guarantee the energy demand that the car normally goes, increase journey ware control strategy includes the following step:
when the SOC of the power battery is larger than the lower limit value of the charging interval, the whole vehicle runs in a pure electric mode, and the power battery singly outputs energy in the pure electric mode; when the SOC of the power battery is reduced to the lower limit value of the charging interval, the range extender is opened, and the whole vehicle operates in a range extending mode;
the power following state of the range extender comprises the fixed-point working of the range extender or the calculation according to the required power of the range extender; under the fixed-point work of the range extender, the rotating speed of the engine is controlled, and then the torque of the engine is controlled; under the calculation of the required power of the range extender, respectively calculating the target rotating speed of the engine and the target torque of the generator; engine speed control is realized by calculating the target engine speed, and generator torque control is realized by calculating the target generator torque;
and finishing the stable output control of the energy of the extended-range power system.
The energy stable output control strategy comprises a range extender control module and a motor control module, wherein the range extender control module comprises vehicle working mode judgment, engine control and generator control, and the motor control module comprises motor drive control and motor brake control; in the energy management control strategy formulated by the range extender control module, the working state of the range extender changes along with the change of the running mode of the vehicle, whether the range extender needs to be started or not is judged according to the SOC of the power battery and the size between the required power of the whole vehicle and the maximum discharge power of the power battery, and when the range extender needs to be started, the constant power control strategy or the power following control strategy is determined according to the required power of the whole vehicle and the output power of the engine working at a high-efficiency point; the motor control module judges whether the vehicle is in a driving mode or a braking energy recovery mode according to the detected vehicle speed and pedal signals, and then calculates the output torque of the motor through the input pedal signals.
After the range extender is started, the engine outputs according to constant power at a preset working point, the output power does not change along with the change of working conditions, the working point comprises an optimal power point and a lowest oil consumption point under the premise of ensuring the dynamic property, and the selection of the working point gives consideration to the fuel consumption, the power and the rotating speed of the engine; the output power of the engine is preferentially used for driving wheels to run under the control strategy, when the driving requirement power of the vehicle is smaller, the remaining engine output power is used for charging a storage battery, in addition, in order to provide enough electric energy under the condition of lowest battery SOC and meet the requirements of various running working conditions, the engine is required to work at a higher rotating speed, the working process of constant power running of the engine is required to be continued until the SOC of the storage battery pack is maximized, and then the range extender is closed or the engine is made to run at idle speed.
The power following control strategy comprises three-point power following control and curve power following control, the three-point power following control preselects engine power values of three optimal working areas, corresponding working points are determined according to different working condition environments and driving intentions of a driver, and the working points of the engine are increased, so that compared with the constant power control strategy, the power following control strategy has two advantages: firstly, most of the engine power can be transmitted to a driving motor through a power transmission route to drive an automobile to run, so that the multi-stage conversion of energy from chemical energy to electric energy to chemical energy to electric energy is reduced, the power loss of the motor is reduced, the efficiency of the whole automobile is improved, secondly, the charging and discharging fluctuation of a storage battery is small, the overdischarge of the storage battery is effectively avoided, the service life and the use stability of the storage battery are improved, the curve power following control, namely the running of the engine is changed along a fixed curve, the power value of the engine can be continuously changed, and the engine power curve in the process of optimal fuel economy is selected as a target following curve; the curve power following control is determined by the running condition of the vehicle, the characteristic of the engine is known, the required power of the vehicle under the condition of a certain moment is determined, the value of the lowest fuel consumption rate point under the power is determined, when the SOC value of the storage battery reaches the lowest limit, the engine or the generator set is started and runs along the lowest fuel consumption rate curve, and in the control mode, the engine can provide little power for the storage battery to charge, the secondary conversion between chemical energy and electric energy is reduced, and the dynamic property and the fuel economy are greatly improved.
In the scheme, the system also comprises an instantaneous optimization control strategy which is mainly used for a power system taking consumed fuel oil in the hybrid electric vehicle, wherein the fuel oil consumption is the sum of indirect consumed fuel oil of electric energy of a battery and direct consumed fuel oil of an engine, and the electric energy consumed by the power battery is equivalent to the fuel oil consumption in calculation, so that the fuel oil consumption and emission can be effectively combined, and an accurate evaluation is made on the electric energy and the fuel oil consumption; the self-adaptive control strategy is characterized in that the size of a weight coefficient is uniformly defined by two different dimensions of fuel consumption and emission of the whole vehicle to obviously reduce the fuel consumption of the whole vehicle or reduce the emission of the two control targets, the controlled factors are acceleration time, hundred kilometers of fuel consumption, HC, CO, PM and NO compounds, the weight of each factor is determined according to the running working condition environment of the vehicle, the control strategy has the advantages that the flexibility of a driver is better, the driver can adjust the driving target according to the environment or own will, and the strategy takes the dynamic property and the economical property as influence factors at the same time, comprehensively considers the optimal working point of an engine-motor, so that the comprehensive performance of the vehicle is better under the control strategy.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. An energy stable output control strategy of a range-extending power system is characterized in that: the control method comprises a whole vehicle control strategy and a range extender control strategy, wherein in the whole vehicle control strategy, when the part of the whole vehicle required energy is larger than the output energy of the power battery, the part of the whole vehicle required energy is compensated by the output energy of the range extender, so that the energy requirement of normal running of the automobile is ensured, and the range extender control strategy comprises the following steps:
s1: when the SOC of the power battery is larger than the lower limit value of the charging interval, the whole vehicle runs in a pure electric mode, and the power battery singly outputs energy in the pure electric mode;
s2: when the SOC of the power battery is reduced to the lower limit value of the charging interval, the range extender is opened, and the whole vehicle operates in a range extending mode;
s3: based on the S2, the step-up device is operated at fixed point or calculated according to the power required by the step-up device under the power following state;
s4: under the fixed-point work of the range extender, the rotating speed of the engine is controlled, and then the torque of the engine is controlled;
s5: under the calculation of the required power according to the range extender, respectively calculating the target rotating speed of the engine and the target torque of the generator;
s6: based on the above S5, engine speed control is achieved by the engine target speed calculation, and generator torque control is achieved by the generator target torque calculation;
s7: and finishing the stable output control of the energy of the extended-range power system.
2. The extended range power system energy stable output control strategy of claim 1, wherein: the energy stable output control strategy comprises a range extender control module and a motor control module, wherein the range extender control module comprises vehicle working mode judgment, engine control and generator control, and the motor control module comprises motor driving control and motor braking control.
3. The extended range power system energy stable output control strategy of claim 2, wherein: in the energy management control strategy formulated by the range extender control module, the working state of the range extender changes along with the change of the running mode of the vehicle, whether the range extender needs to be started or not is judged according to the SOC of the power battery and the size between the required power of the whole vehicle and the maximum discharge power of the power battery, and when the range extender needs to be started, the constant power control strategy or the power following control strategy is decided to be adopted according to the required power of the whole vehicle and the output power of the engine working at the high-efficiency point.
4. The extended range power system energy stable output control strategy of claim 2, wherein: the motor control module judges whether the vehicle is in a driving mode or a braking energy recovery mode according to the detected vehicle speed and pedal signals, and then calculates the output torque of the motor through the input pedal signals.
5. An extended range power system energy stable output control strategy according to claim 3, wherein: after the range extender is started, the engine outputs constant power at a preset working point, the output power does not change along with the change of working conditions, the working point comprises an optimal power point and a lowest oil consumption point under the premise of ensuring the dynamic property, and the selection of the working point gives consideration to the fuel consumption, the power and the rotating speed of the engine.
6. An extended range power system energy stable output control strategy according to claim 3, wherein: the power following control strategy comprises three-point power following control and curve power following control, wherein the three-point power following control preselects engine power values of three optimal working areas, corresponding working points are determined according to different working condition environments and driving intentions of a driver, the working points of the engine are increased, the curve power following control is that the operation of the engine is changed along a fixed curve, the power values of the engine can be continuously changed, and an engine power curve in the optimal fuel economy is selected as a target following curve.
7. The extended range power system energy stable output control strategy of claim 6, wherein: the curve power following control is determined by the running condition of the vehicle, the characteristic of the engine is known, the required power of the vehicle under the condition of a certain moment, the numerical value of the lowest fuel consumption rate point under the power is determined, and when the SOC value of the storage battery reaches the lowest limit, the engine or the generator set is started and runs along the curve of the lowest fuel consumption rate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118025124A (en) * | 2024-04-12 | 2024-05-14 | 潍柴动力股份有限公司 | Energy control method and device of range extender, electronic equipment and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118025124A (en) * | 2024-04-12 | 2024-05-14 | 潍柴动力股份有限公司 | Energy control method and device of range extender, electronic equipment and storage medium |
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