CN112389410A - Range extender control method and system for hybrid electric vehicle, storage medium and terminal - Google Patents
Range extender control method and system for hybrid electric vehicle, storage medium and terminal Download PDFInfo
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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
- 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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- 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
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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
- 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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- 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
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/24—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means
- B60W10/26—Conjoint control of vehicle sub-units of different type or different function including control of energy storage means for electrical energy, e.g. batteries or capacitors
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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
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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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0638—Engine speed
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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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0657—Engine torque
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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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/08—Electric propulsion units
- B60W2510/081—Speed
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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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/08—Electric propulsion units
- B60W2510/083—Torque
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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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/24—Energy storage means
- B60W2510/242—Energy storage means for electrical energy
- B60W2510/244—Charge state
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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
- 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
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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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
- 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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- 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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses a method, a system, a storage medium and a terminal for controlling a range extender of a hybrid electric vehicle, belonging to the technical field of range extender control, wherein the method comprises the following steps: determining the working condition point of the current engine according to the real-time charge state information of the battery and/or the real-time rotating speed information and the torque information of the driving motor; and adjusting the rotating speed and the torque of the engine according to the working condition point of the engine. The invention determines the current working condition point of the engine according to the real-time charge state information of the battery and/or the real-time rotating speed information and the torque information of the driving motor, and further adjusts the working condition (rotating speed and torque) of the engine according to the different working condition points of the engine, so that the power requirement of the automobile can be considered when the engine works in a low fuel consumption rate interval, the high-power load of the battery is reduced, the fuel consumption rate of the engine is improved, and the charge-discharge efficiency of the battery can be improved.
Description
Technical Field
The invention relates to the technical field of range extender control, in particular to a method, a system, a storage medium and a terminal for controlling a range extender of a hybrid electric vehicle.
Background
Under the large background of automobile fuel laws and new energy automobiles, design and development of automobile energy management strategies are increasingly important. The control strategies of different types of hybrid vehicles are different. The extended range hybrid electric vehicle generally uses a thermostat control strategy, a power following strategy, an extended range multi-operating point working strategy (automotive engineering report, extended range hybrid electric vehicle control strategy research based on user acceptance-huping, zhang hao; Chinese agro-chemistry report, extended range hybrid electric vehicle control strategy research-scholarly, shengxi sail) and other control methods to associate the start-stop and working state of an engine with the vehicle speed, the vehicle power and the like as control strategies to achieve the purpose of improving the fuel economy, but all have certain defects:
1. regarding a thermostat control strategy and a multi-operating-point control strategy, the two control modes are that a specific working torque rotating speed point of an engine is determined according to the SOC of a power battery to supplement power, the battery is charged and discharged frequently to reduce the service life of the battery when a vehicle is actually used, and the engine is started and stopped frequently to cause dynamic loss, so that the overall loss power of an automobile system is increased, and the fuel economy is reduced;
2. the power following strategy is that the engine tracks the power required by the vehicle in the whole process, and the engine is stopped or idled only when the SOC is higher than the upper limit value and the battery power completely meets the vehicle requirement. This strategy causes the engine to operate in a large load region from low to high and further reduces efficiency through energy conversion, resulting in reduced engine emissions and overall vehicle efficiency.
3. Due to the huge data and calculation amount of the optimal control strategy based on the fuzzy control strategy and the genetic algorithm, the requirements on the hardware and software levels of the calculation on the automobile are too high, and the optimal control strategy is not widely applied.
Disclosure of Invention
The invention aims to solve the problems that an engine works in a high fuel consumption power interval and the battery charging and discharging efficiency is low in the prior art, and provides a range extender control method, a range extender control system, a storage medium and a terminal of a hybrid electric vehicle.
The purpose of the invention is realized by the following technical scheme: a method of controlling a range extender of a hybrid vehicle, the method comprising:
determining the working condition point of the current engine according to the real-time charge state information of the battery and/or the real-time rotating speed information and the torque information of the driving motor; and adjusting the rotating speed and the torque of the engine according to the working condition point of the engine.
As an option, the operating points include: engine off, low power operating point, medium power operating point, and external characteristic operating point.
As an option, the method further comprises a parameter association step:
the real-time charge state information of the battery, the real-time rotating speed information of the driving motor and the torque information of the driving motor under different working condition points of the engine are analyzed by combining the actual driving big data of the extended range type hybrid power driving system automobile and the speed and power information of the driving cycle working condition of the light automobile in China; and establishing a relation mapping table of the real-time state of charge information of the battery, the real-time rotating speed information of the driving motor and the torque information and the working condition point of the engine.
As an option, the relationship mapping table specifically includes:
when the engine does not work, the real-time charge state of the battery is more than 65, or the torque of the driving motor is a negative value and the rotating speed interval of the driving motor is 0-1800rpm, or the torque interval of the driving motor is 0-20Nm and the rotating speed interval of the driving motor is 0-1800 rpm; when the engine is at a low-power working point, the real-time charge state range of the battery is 50-60, or the torque interval of the driving motor is 20-50Nm and the rotating speed interval of the driving motor is 1800-3500 rpm; when the engine is at a medium-power working point, the real-time charge state of the battery is less than 45, or the torque interval of the driving motor is 30-80Nm and the rotating speed interval of the driving motor is 3500-5500 rpm; when the engine is at the external characteristic operating point, the torque of the driving motor is more than 50Nm and the rotating speed of the driving motor is more than 5500 rpm.
It should be further noted that the technical features corresponding to the above-mentioned method options can be combined with each other or replaced to form a new technical solution.
The present invention also includes a range extender control system for a hybrid vehicle, the system comprising: the system comprises a control subsystem, a battery, a driving motor and an engine, wherein the power of the engine is output to the driving motor, and the power output end of the battery is connected with the driving motor; the control subsystem is connected with the battery, the driving motor and the engine, acquires real-time charge state information of the battery and/or real-time rotating speed information and torque information of the driving motor, determines a current working condition point of the engine according to the real-time charge state information of the battery and/or the real-time rotating speed information and torque information of the driving motor, and further adjusts the rotating speed and the torque of the engine.
As an option, the control subsystem includes an engine management subsystem, a controller, and a battery management subsystem; the driving motor is connected with the controller, the battery output end is connected with the battery management subsystem, the battery management subsystem and the controller output end are connected with the engine management subsystem, and the engine management subsystem output end is connected with the engine.
As an option, the operating points include: engine off, low power operating point, medium power operating point, and external characteristic operating point.
As an option, when the engine does not work, the real-time state of charge of the battery is more than 65, or the torque of the driving motor is a negative value and the rotating speed interval of the driving motor is 0-1800rpm, or the torque interval of the driving motor is 0-20Nm and the rotating speed interval of the driving motor is 0-1800 rpm; when the engine is at a low-power working point, the real-time charge state range of the battery is 50-60, or the torque interval of the driving motor is 20-50Nm and the rotating speed interval of the driving motor is 1800-3500 rpm; when the engine is at a medium-power working point, the real-time charge state of the battery is less than 45, or the torque interval of the driving motor is 30-80Nm and the rotating speed interval of the driving motor is 3500-5500 rpm; when the engine is at the external characteristic operating point, the torque of the driving motor is more than 50Nm and the rotating speed of the driving motor is more than 5500 rpm.
It should be further noted that the technical features corresponding to the above-mentioned system options can be combined with each other or replaced to form a new technical solution.
The invention also includes a storage medium having stored thereon computer instructions which, when executed, perform the steps of the above-described hybrid vehicle range extender control method.
The invention also comprises a terminal which comprises a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor, and the processor executes the steps of the range extender control method of the hybrid electric vehicle when running the computer instructions.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention determines the current working condition point of the engine according to the real-time charge state information of the battery and/or the real-time rotating speed information and the torque information of the driving motor, and further adjusts the working condition (rotating speed and torque) of the engine according to the different working condition points of the engine, so that the power requirement of the automobile can be considered when the engine works in a low fuel consumption rate interval, the high-power load of the battery is reduced, the fuel consumption rate of the engine is improved, and the charge-discharge efficiency of the battery can be improved.
(2) The invention divides the working points of the engine into a plurality of sections, namely the working points of the engine comprise the working points of the engine which does not work, the working points with low power, the working points with medium power and the working points with external characteristics, enlarges the power supply section of the engine, reduces the high-power load of the battery, improves the fuel consumption rate of the engine and simultaneously improves the charging and discharging efficiency of the battery.
(3) The controller receives the torque and rotating speed signals of the driving motor and transmits the torque and rotating speed signals to the engine management subsystem, and then the engine management subsystem regulates and controls the working rotating speed and the working torque of the engine, so that the signal transmission is rapid and accurate, and the engine can be accurately controlled.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.
FIG. 1 is a flowchart of a method of example 1 of the present invention;
FIG. 2 is a block diagram of a system according to embodiment 2 of the present invention;
fig. 3 is a system block diagram of embodiment 2 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that directions or positional relationships indicated by "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are directions or positional relationships described based on the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The control strategy of the range extender (engine + generator) is embodied in that: the control idea is transferred from the power calculation of the battery and the whole vehicle to the SOC (state of charge) of the battery and the working rotating speed and torque interval of the driving motor to be associated, the power of the whole vehicle does not need to be further calculated, the running state is rapidly judged in real time, and the starting and stopping of the engine are controlled corresponding to different working rotating speed and torque points of the engine by combining the idea of optimally controlling the fuel consumption rate of the engine by a multi-operating-point control strategy.
Example 1
As shown in fig. 1, in embodiment 1, the method for controlling the range extender of the hybrid vehicle specifically includes the following steps:
s11: determining the working condition point of the current engine according to the real-time charge state information of the battery and/or the real-time rotating speed information and the torque information of the driving motor; the working points of the engine are divided into 4 working points which are respectively the engine non-working point, the low-power working point, the medium-power working point and the external characteristic working point, so that the power supply interval of the engine is expanded, the high-power load of the battery is reduced, the fuel consumption rate of the engine is improved, and the charging and discharging efficiency of the battery is improved.
S12: and adjusting the rotating speed and the torque of the engine according to the working condition point of the engine so as to enable the engine to work in a low fuel consumption rate interval.
The invention determines the current working condition point of the engine according to the real-time charge state information of the battery and/or the real-time rotating speed information and the torque information of the driving motor, and further adjusts the working condition (rotating speed and torque) of the engine according to the different working condition points of the engine, so that the power requirement of the automobile can be considered when the engine works in a low fuel consumption rate interval, the high-power load of the battery is reduced, the fuel consumption rate of the engine is improved, and the charge-discharge efficiency of the battery can be improved.
Further, before step S11, a parameter associating step is further included:
s01: the real-time charge state information of a battery, the real-time rotating speed information of a driving motor and the torque information of the driving motor at different working condition points of an engine are analyzed by combining the actual driving big data of the extended range hybrid power driving system automobile and the speed and power information of the driving cycle working condition (CLTC) of the light automobile in China; specifically, data investigation is carried out on the speed and power of domestic automobiles, and distribution characteristics of the speed, the power and the torque are analyzed. As an option, the vehicle speed is 30-60km/h in normal running usually in urban road running; the regulations stipulate 120km/h and the like when the vehicle runs at high speed. More specifically, the CLTC cycle conditions are analyzed. Compared with the NEDC, the CLTC cycle working condition time is increased, the average speed and the highest speed are lower, and the CLTC cycle working condition time is matched with big data collected by the current traffic; from the analysis of acceleration, deceleration, uniform speed and parking, the acceleration and deceleration proportion of the CLTC is obviously improved to 35-45%, the road is severer in running, the uniform speed time is shorter, and the power changes frequently; the acceleration and deceleration of the CLTC are more in the middle and low speed range (<80km/h), the deceleration proportion is increased, the time for which the engine does not need to work is increased, and the energy recovery is more favorable.
S02: and establishing a relation mapping table of the real-time state of charge information of the battery, the real-time rotating speed information of the driving motor and the torque information and the working condition point of the engine. Based on the analysis of actual driving big data and CLTC working condition, the invention takes the SOC of the battery, the four interval range signals of the rotating speed and the torque of the driving machine as control signals to be input into EMS (engine management subsystem) in the control subsystem, and concretely comprises the following steps:
when the engine does not work, the real-time charge state of the battery is more than 65, or the torque of the driving motor is a negative value and the rotating speed interval of the driving motor is 0-1800rpm, or the torque interval of the driving motor is 0-20Nm and the rotating speed interval of the driving motor is 0-1800 rpm; it should be noted that the current operating point motor does not work, and does not generate power.
When the engine is at a low-power working point, the real-time charge state range of the battery is 50-60, or the torque interval of the driving motor is 20-50Nm and the rotating speed interval of the driving motor is 1800-3500 rpm; it should be noted that the operating torques and the engine operating point rotational speeds and torque values corresponding to the range of the rotational speed intervals of the automobile driving motors of different brands and models are different, and the engine is started and drives the generator to start at the current operating point.
When the engine is at a medium-power working point, the real-time charge state of the battery is less than 45, or the torque interval of the driving motor is 30-80Nm and the rotating speed interval of the driving motor is 3500-5500 rpm.
When the engine is at the external characteristic operating point, the torque of the driving motor is more than 50Nm and the rotating speed of the driving motor is more than 5500 rpm.
Example 2
The present embodiment has the same inventive concept as embodiment 1, and on the basis of embodiment 1, provides a range extender control system for a hybrid electric vehicle, as shown in fig. 2, the system specifically includes: the system comprises a control subsystem, a battery, a driving motor and an engine, wherein the power of the engine is output to the driving motor, and the power output end of the battery is connected with the driving motor; the control subsystem is connected with the battery, the driving motor and the engine, acquires real-time charge state information of the battery and/or real-time rotating speed information and torque information of the driving motor, determines the current working condition point of the engine according to the real-time charge state information of the battery and/or the real-time rotating speed information and torque information of the driving motor, and further adjusts the rotating speed and the torque of the engine, so that the power requirement of the automobile can be considered when the engine works in a low fuel consumption interval, and meanwhile, the charging and discharging efficiency of the battery can be well improved.
It should be noted that the collection of the operating speed and torque information of the driving motor and the state of charge information of the battery can be collected and fed back through a sensor of the vehicle's own system, which belongs to the common general knowledge of those skilled in the art and is not within the scope of the claimed invention.
Furthermore, the working points of the engine are divided into 4 working points which are respectively the engine non-working point, the low-power working point, the medium-power working point and the external characteristic working point, so that the power supply interval of the engine is expanded, the high-power load of the battery is reduced, the fuel consumption rate of the engine is improved, and the charging and discharging efficiency of the battery is improved.
Further, as shown in fig. 3, the power drive of the system of the present invention is that the engine is connected to the driving motor through the generator and the first power converter, one end of the battery is connected to the first power converter, the other end is connected to the charging device through the second power converter, and the driving motor is in transmission connection with the mechanical transmission system. More specifically, the engine does not directly drive the vehicle to run, and is connected with the generator through the speed increaser so as to drive the generator to generate electricity; the driving motor is powered by a battery or a range extender (an engine and a generator); the driving motor and the mechanical transmission system are in gear connection, and the power is transmitted to the driving wheel through a half shaft to drive the vehicle to run by connecting a single-stage speed reducer and a differential mechanism.
Further, the control subsystem includes an engine management subsystem, a controller, and a battery management subsystem; the controller is connected with the driving motor in a bidirectional mode, the battery output end is connected with the battery management subsystem, the battery management subsystem and the controller output end are connected with the engine management subsystem, and the engine management subsystem output end is connected with the engine. The controller receives the torque and rotating speed signals of the driving motor and transmits the torque and rotating speed signals to the engine management subsystem, and then the engine management subsystem regulates and controls the working rotating speed and the working torque of the engine, so that the signal transmission is rapid and accurate, and the engine can be accurately controlled.
Further, before the control subsystem of the present invention receives the real-time state of charge information of the battery, and/or the real-time rotational speed information and the torque information of the driving motor, the present invention further comprises:
s01: the real-time charge state information of a battery, the real-time rotating speed information of a driving motor and the torque information of the driving motor at different working condition points of an engine are analyzed by combining the actual driving big data of the extended range hybrid power driving system automobile and the speed and power information of the driving cycle working condition (CLTC) of the light automobile in China; specifically, data investigation is carried out on the speed and power of domestic automobiles, and distribution characteristics of the speed, the power and the torque are analyzed. As an option, the vehicle speed is 30-60km/h in normal running usually in urban road running; the regulations stipulate 120km/h and the like when the vehicle runs at high speed. More specifically, the CLTC cycle conditions are analyzed. Compared with the NEDC, the CLTC cycle working condition time is increased, the average speed and the highest speed are lower, and the CLTC cycle working condition time is matched with big data collected by the current traffic; from the analysis of acceleration, deceleration, uniform speed and parking, the acceleration and deceleration proportion of the CLTC is obviously improved to 35-45%, the road is severer in running, the uniform speed time is shorter, and the power changes frequently; the acceleration and deceleration of the CLTC are more in the middle and low speed range (<80km/h), the deceleration proportion is increased, the time for which the engine does not need to work is increased, and the energy recovery is more favorable.
S02: and establishing a relation mapping table of the real-time state of charge information of the battery, the real-time rotating speed information of the driving motor and the torque information and the working condition point of the engine. Based on the analysis of actual driving big data and CLTC working condition, the invention takes the SOC of the battery, the four interval range signals of the rotating speed and the torque of the driving machine as control signals to be input into EMS (engine management subsystem) in the control subsystem, and concretely comprises the following steps:
when the engine does not work, the real-time charge state of the battery is more than 65, or the torque of the driving motor is a negative value and the rotating speed interval of the driving motor is 0-1800rpm, or the torque interval of the driving motor is 0-20Nm and the rotating speed interval of the driving motor is 0-1800 rpm; it should be noted that the current operating point motor does not work, and does not generate power.
When the engine is at a low-power working point, the real-time charge state range of the battery is 50-60, or the torque interval of the driving motor is 20-50Nm and the rotating speed interval of the driving motor is 1800-3500 rpm; it should be noted that the operating torques and the engine operating point rotational speeds and torque values corresponding to the range of the rotational speed intervals of the automobile driving motors of different brands and models are different, and the engine is started and drives the generator to start at the current operating point.
When the engine is at a medium-power working point, the real-time charge state of the battery is less than 45, or the torque interval of the driving motor is 30-80Nm and the rotating speed interval of the driving motor is 3500-5500 rpm.
When the engine is at the external characteristic operating point, the torque of the driving motor is more than 50Nm and the rotating speed of the driving motor is more than 5500 rpm.
Example 3
The present embodiment provides a storage medium having the same inventive concept as embodiment 1, and having stored thereon computer instructions which, when executed, perform the steps of the range extender control method of the hybrid vehicle described in embodiment 1.
Based on such understanding, the technical solution of the present embodiment or parts of the technical solution may be essentially implemented in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Example 4
The embodiment also provides a terminal, which has the same inventive concept as the embodiment 1, and comprises a memory and a processor, wherein the memory stores computer instructions capable of running on the processor, and the processor executes the steps of the range extender control method of the hybrid electric vehicle described in the embodiment 1 when running the computer instructions. The processor may be a single or multi-core central processing unit or a specific integrated circuit, or one or more integrated circuits configured to implement the present invention.
Each functional unit in the embodiments provided by the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The above detailed description is for the purpose of describing the invention in detail, and it should not be construed that the detailed description is limited to the description, and it will be apparent to those skilled in the art that various modifications and substitutions can be made without departing from the spirit of the invention.
Claims (10)
1. A control method of a range extender of a hybrid electric vehicle is characterized by comprising the following steps: the method comprises the following steps:
determining the working condition point of the current engine according to the real-time charge state information of the battery and/or the real-time rotating speed information and the torque information of the driving motor;
and adjusting the rotating speed and the torque of the engine according to the working condition point of the engine.
2. The range extender control method of a hybrid vehicle according to claim 1, characterized in that: the operating points include: engine off, low power operating point, medium power operating point, and external characteristic operating point.
3. The range extender control method of a hybrid vehicle according to claim 2, characterized in that: the method further comprises a parameter association step:
the real-time charge state information of the battery, the real-time rotating speed information of the driving motor and the torque information of the driving motor under different working condition points of the engine are analyzed by combining the actual driving big data of the extended range type hybrid power driving system automobile and the speed and power information of the driving cycle working condition of the light automobile in China;
and establishing a relation mapping table of the real-time state of charge information of the battery, the real-time rotating speed information of the driving motor and the torque information and the working condition point of the engine.
4. The range extender control method of a hybrid vehicle according to claim 1, characterized in that: the relation mapping table specifically comprises:
when the engine does not work, the real-time charge state of the battery is more than 65, or the torque of the driving motor is a negative value and the rotating speed interval of the driving motor is 0-1800rpm, or the torque interval of the driving motor is 0-20Nm and the rotating speed interval of the driving motor is 0-1800 rpm;
when the engine is at a low-power working point, the real-time charge state range of the battery is 50-60, or the torque interval of the driving motor is 20-50Nm and the rotating speed interval of the driving motor is 1800-3500 rpm;
when the engine is at a medium-power working point, the real-time charge state of the battery is less than 45, or the torque interval of the driving motor is 30-80Nm and the rotating speed interval of the driving motor is 3500-5500 rpm;
when the engine is at the external characteristic operating point, the torque of the driving motor is more than 50Nm and the rotating speed of the driving motor is more than 5500 rpm.
5. The utility model provides a hybrid vehicle's range extender control system which characterized in that: the system comprises: the system comprises a control subsystem, a battery, a driving motor and an engine, wherein the power of the engine is output to the driving motor, and the power output end of the battery is connected with the driving motor;
the control subsystem is connected with the battery, the driving motor and the engine, acquires real-time charge state information of the battery and/or real-time rotating speed information and torque information of the driving motor, determines a current working condition point of the engine according to the real-time charge state information of the battery and/or the real-time rotating speed information and torque information of the driving motor, and further adjusts the rotating speed and the torque of the engine.
6. The range extender control system of a hybrid vehicle according to claim 5, characterized in that: the control subsystem comprises an engine management subsystem, a controller and a battery management subsystem;
the driving motor is connected with the controller, the battery output end is connected with the battery management subsystem, the battery management subsystem and the controller output end are connected with the engine management subsystem, and the engine management subsystem output end is connected with the engine.
7. The range extender control system of a hybrid vehicle according to claim 6, characterized in that: the operating points include: engine off, low power operating point, medium power operating point, and external characteristic operating point.
8. The range extender control system for a hybrid vehicle according to claim 7, characterized in that: when the engine does not work, the real-time charge state of the battery is more than 65, or the torque of the driving motor is a negative value and the rotating speed interval of the driving motor is 0-1800rpm, or the torque interval of the driving motor is 0-20Nm and the rotating speed interval of the driving motor is 0-1800 rpm;
when the engine is at a low-power working point, the real-time charge state range of the battery is 50-60, or the torque interval of the driving motor is 20-50Nm and the rotating speed interval of the driving motor is 1800-3500 rpm;
when the engine is at a medium-power working point, the real-time charge state of the battery is less than 45, or the torque interval of the driving motor is 30-80Nm and the rotating speed interval of the driving motor is 3500-5500 rpm;
when the engine is at the external characteristic operating point, the torque of the driving motor is more than 50Nm and the rotating speed of the driving motor is more than 5500 rpm.
9. A storage medium having stored thereon computer instructions, characterized in that: the computer instructions when executed perform the steps of the hybrid vehicle range extender control method as set forth in any one of claims 1-4.
10. A terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, the terminal comprising: the processor executes the computer instructions to execute the steps of the hybrid vehicle range extender control method according to any one of claims 1-4.
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Application publication date: 20210223 |