CN116605205A - Method and system for optimizing efficiency of hybrid power system - Google Patents
Method and system for optimizing efficiency of hybrid power system Download PDFInfo
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- CN116605205A CN116605205A CN202210118102.8A CN202210118102A CN116605205A CN 116605205 A CN116605205 A CN 116605205A CN 202210118102 A CN202210118102 A CN 202210118102A CN 116605205 A CN116605205 A CN 116605205A
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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
- B60W20/15—Control strategies specially adapted for achieving a particular effect
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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
- 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
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
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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
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/10—Longitudinal 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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0644—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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0666—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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/08—Electric propulsion units
- B60W2710/081—Speed
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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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- Mechanical Engineering (AREA)
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Abstract
The invention provides a method and a system for optimizing efficiency of a hybrid vehicle, wherein the hybrid vehicle comprises a first motor, a second motor and an engine, and the method is characterized by comprising the following steps: determining the current speed of a vehicle and the engine torque corresponding to the speed; calculating the energy loss power of the vehicle according to the engine torque; adjusting the engine torque in an adjustment step; calculating energy loss power corresponding to the adjusted engine torque; repeating the steps until the adjusted engine torque reaches a limit torque setting; and comparing all the energy loss power obtained by repeating the steps to determine the minimum energy loss power of the vehicle.
Description
Technical Field
The present invention relates to the field of hybrid vehicles, and in particular to a method and system for optimizing efficiency of a hybrid system, a computer device and a computer-readable storage medium for implementing the method.
Background
Hybrid electric vehicles developed and developed at present can be classified into three types: serial, parallel and series-parallel hybrid electric vehicles. For these three vehicles, after the selection of each component is determined, the adoption of a proper control strategy is the key to achieving the best fuel economy and reducing the emission. For a series-parallel hybrid electric vehicle, a control strategy based on logic threshold control is common for efficiency optimization of a system. The logic threshold control strategy is a control strategy for limiting the working interval of the battery and the engine, and the engine is controlled to run in a high-efficiency interval by setting a threshold value to provide required torque; the motor is used as a load adjusting device in efficiency optimization, the motor participates in driving when large torque output is needed, and the motor absorbs engine torque to generate power when small torque output is needed, and the state of charge (SOC) of the battery is maintained in a reasonable range.
The control method is simple in design and small in calculation amount, and is only suitable for being applied to the optimal efficiency under the fixed working condition although the optimal efficiency is also targeted. Meanwhile, the method is also affected by the charge state, aging, dynamic characteristics of an engine and the like of the battery, and the efficiency of the vehicle under various working conditions and different part states cannot be optimized in real time.
Disclosure of Invention
According to a first aspect of the present invention, there is provided a method of optimizing efficiency of a hybrid vehicle comprising a first electric machine, a second electric machine and an engine, the method comprising the steps of: determining the current speed of a vehicle and the engine torque corresponding to the speed; calculating the energy loss power of the vehicle according to the engine torque; adjusting the engine torque in an adjustment step; calculating energy loss power corresponding to the adjusted engine torque; repeating the steps until the adjusted engine torque reaches a limit torque setting; and comparing all the energy loss power obtained by repeating the steps to determine the minimum energy loss power of the vehicle.
Alternatively, according to one or more embodiments of the first aspect of the invention, the respective torques and rotational speeds of the first electric machine, the second electric machine and the engine are determined based on a minimum power loss of the vehicle.
Optionally, according to one or more embodiments of the first aspect of the invention, wherein the energy loss power of the vehicle is calculated from one or more of the following data: effective mechanical power T of the engine ENG Energy loss power L of engine Eng Effective mechanical power T of the first motor MtrA Energy loss power L of first motor MtrA Effective mechanical power T of the second motor MtrB Energy loss power L of second motor MtrB 。
Alternatively, according to one or more embodiments of the first aspect of the present invention, the adjusting is adding/subtracting the engine torque corresponding to the speed by the adjustment step.
According to a second aspect of the present invention, there is provided a method of optimizing efficiency of a hybrid vehicle comprising a first electric machine, a second electric machine and an engine, the method comprising the steps of: determining the current speed of the vehicle and the engine speed corresponding to the speed; calculating the energy loss power of the vehicle according to the engine speed; adjusting the engine speed with an adjustment step; calculating energy loss power corresponding to the adjusted engine speed; repeating the steps until the adjusted engine speed reaches a limit speed setting value; and comparing all the energy loss power obtained by repeating the steps to determine the minimum energy loss power of the vehicle.
Optionally, according to one or more embodiments of the second aspect of the invention, wherein the respective torques and rotational speeds of the first electric machine, the second electric machine and the engine are determined according to a minimum energy loss power of the vehicle.
Optionally, according to one or more embodiments of the second aspect of the invention, wherein the energy loss power of the vehicle is calculated from one or more of the following data: effective mechanical power T of the engine ENG Energy loss power L of engine Eng Effective mechanical power T of the first motor MtrA Energy loss power L of first motor MtrA Effective mechanical power T of the second motor MtrB Energy loss power L of second motor MtrB 。
Optionally, according to one or more embodiments of the second aspect of the present invention, the adjusting is increasing/decreasing the engine speed corresponding to the speed by the adjustment step.
According to a third aspect of the present invention, there is provided a method of optimizing efficiency of a hybrid vehicle comprising a first electric machine, a second electric machine and an engine, the method comprising the steps of: determining the current speed of the vehicle and the second motor rotating speed corresponding to the speed; calculating the energy loss power of the vehicle according to the second motor rotating speed; adjusting the rotating speed of the second motor by an adjusting step length; calculating energy loss power corresponding to the adjusted second motor rotating speed; repeating the steps until the adjusted engine speed reaches a limit speed setting value; and comparing all the energy loss power obtained by repeating the steps to determine the minimum energy loss power of the vehicle.
According to a fourth aspect of the present invention, there is provided a system for efficiency optimization of a hybrid vehicle including a first electric machine, a second electric machine, and an engine, the system comprising: an electronic control unit configured to determine a current speed of the vehicle and an engine torque corresponding to the speed; a processor unit configured to execute instructions; a memory unit storing instructions that, when executed, cause the processor unit to: calculating the energy loss power of the vehicle according to the engine torque; adjusting the engine torque in an adjustment step; calculating energy loss power corresponding to the adjusted engine torque; repeating the steps until the adjusted engine torque reaches a limit torque setting; and comparing all the energy loss power obtained by repeating the steps to determine the minimum energy loss power of the vehicle.
Optionally, according to one or more embodiments of the fourth aspect of the invention, wherein the respective torques and rotational speeds of the first electric machine, the second electric machine and the engine are determined according to a minimum power loss of the vehicle.
Optionally, according to one or more embodiments of the fourth aspect of the invention, wherein the energy loss power of the vehicle is calculated from one or more of the following data: effective mechanical power T of the engine ENG Energy loss power L of engine Eng Effective mechanical power T of the first motor MtrA Energy loss power L of first motor MtrA Effective mechanical power T of the second motor MtrB Energy loss power L of second motor MtrB 。
Optionally, according to one or more embodiments of the fourth aspect of the present invention, the adjusting is adding/subtracting the engine torque corresponding to the speed by the adjustment step.
According to a fifth aspect of the present invention, there is provided a system for efficiency optimization of a hybrid vehicle including a first electric machine, a second electric machine, and an engine, the system comprising: an electronic control unit configured to determine a current speed of the vehicle and an engine speed corresponding to the speed; a processor unit configured to execute instructions; a memory unit storing instructions that, when executed, cause the processor unit to: calculating the energy loss power of the vehicle according to the engine speed; adjusting the engine speed with an adjustment step; calculating energy loss power corresponding to the adjusted engine speed; repeating the steps until the adjusted engine speed reaches a limit speed setting value; and comparing all the energy loss power obtained by repeating the steps to determine the minimum energy loss power of the vehicle.
Optionally, according to one or more embodiments of the fifth aspect of the invention, wherein the respective torques and rotational speeds of the first electric machine, the second electric machine and the engine are determined according to a minimum power loss of the vehicle.
Optionally, according to one or more embodiments of the fifth aspect of the invention, wherein the energy loss power of the vehicle is calculated from one or more of the following data: effective mechanical power T of the engine ENG Energy loss power L of engine Eng Effective mechanical power T of the first motor MtrA Energy loss power L of first motor MtrA Effective mechanical power T of the second motor MtrB Energy loss power L of second motor MtrB 。
Optionally, according to one or more embodiments of the fifth aspect of the present invention, the adjusting is adding/subtracting the engine speed corresponding to the speed by the adjustment step.
According to a sixth aspect of the present invention, there is provided a system for efficiency optimization of a hybrid vehicle including a first electric machine, a second electric machine, and an engine, the system comprising: an electronic control unit configured to determine a current speed of the vehicle and a second motor speed corresponding to the speed; a processor unit configured to execute instructions; a memory unit storing instructions that, when executed, cause the processor unit to: calculating the energy loss power of the vehicle according to the second motor rotating speed; adjusting the rotating speed of the second motor by an adjusting step length; calculating energy loss power corresponding to the adjusted second motor rotating speed; repeating the steps until the adjusted engine speed reaches a limit speed setting value; and comparing all the energy loss power obtained by repeating the steps to determine the minimum energy loss power of the vehicle.
According to a seventh aspect of the present invention there is provided a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor running the computer program to implement: a method as described above.
According to an eighth aspect of the present invention, there is provided a computer readable storage medium having stored thereon a computer program, the computer program being implementable when executed by a processor: a method as described above.
Other features and advantages of the methods and systems of the present invention will be apparent from or elucidated with reference to the drawings, which are incorporated herein, and with the following detailed description of certain principles of the invention.
Drawings
The foregoing and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the following description of the various aspects taken in conjunction with the accompanying drawings in which like or similar elements are designated with the same reference numerals. The drawings include:
fig. 1 shows a schematic diagram of a hybrid system 100 according to an embodiment of the invention.
FIG. 2 illustrates a flow chart of a method 200 of hybrid vehicle efficiency optimization in accordance with one embodiment of the invention.
FIG. 3 illustrates a flow chart of a method 300 of hybrid vehicle efficiency optimization in accordance with one embodiment of the invention.
FIG. 4 illustrates a flow chart of a method 400 of hybrid vehicle efficiency optimization in accordance with one embodiment of the invention.
FIG. 5 illustrates a hybrid vehicle efficiency optimization system 500 in accordance with one embodiment of the invention.
Fig. 6 illustrates a hybrid vehicle efficiency optimization system 600 in accordance with one embodiment of the invention.
Fig. 7 illustrates a hybrid vehicle efficiency optimization system 700 in accordance with one embodiment of the invention.
Fig. 8 is a schematic block diagram of a computer device in accordance with yet another embodiment of the present invention.
Detailed Description
In this specification, the invention will be described more fully with reference to the accompanying drawings in which illustrative embodiments of the invention are shown. This invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. The embodiments are presented in order to fully complete the disclosure herein to more fully convey the scope of the invention to those skilled in the art.
Terms such as "comprising" and "including" mean that in addition to having elements and steps that are directly and explicitly recited in the description, the inventive aspects also do not exclude the presence of other elements and steps not directly or explicitly recited. The terms such as "first" and "second" do not denote the order of units in terms of time, space, size, etc. but rather are merely used to distinguish one unit from another.
The present invention is described below with reference to flowchart illustrations, block diagrams, and/or flowchart illustrations of methods and systems according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block and/or flow diagram block or blocks. Fig. 1 shows a schematic diagram of a hybrid system 100 according to an embodiment of the invention. As shown in fig. 1, the hybrid system 100 includes an engine 101, a transmission 102, a first electric machine 103 (MtrA) coupled to the engine, and a second electric machine (MtrB) 104. In the context of the present invention, the engine may be an automotive engine commonly used in the art, such as a gasoline engine, a diesel engine, etc. An electric motor refers to an electric drive power source commonly used in the art that outputs power through rotational speed and torque. As shown in fig. 1, the first electric machine (MtrA) 103 may be coupled to the engine through a fixed or non-fixed ratio, while the second electric machine (MtrB) 104 is on the independent drive wheel side, while the engine is coupled to the drive shaft through a driveline and gearbox.
As described in the background, the control method and system provided by the present invention are directed to a hybrid vehicle of the hybrid type. In a hybrid system including an engine 101, a first motor (MtrA) connected to the engine, and a second motor (MtrB), the operational energy consumption loss of the hybrid system can be calculated by the following formula:
(equation 1)
Wherein L represents the energy loss power of the system, and T represents the effective mechanical power of the system; the first motor is represented by MtrA, the second motor is represented by MtrB, the engine is represented by Eng, and F represents the combination of the influencing factors such as the vehicle battery state of charge SOC, the battery state of health SOH, emissions and the driveline. The parameter F can be determined by testing or by looking up a table, so that the energy loss rate of the whole system during the running process of the vehicle, namely L, is determined MX One or more of the following parameters need to be determined: effective mechanical power T of engine ENG Energy loss power L of engine Eng Effective mechanical power T of first motor MtrA Energy loss power L of first motor MtrA Effective mechanical power T of second motor MtrB Energy loss power L of second motor MtrB . So long as the system energy loss rate L can be ensured in real time MX Minimum, the system can be ensured to work at the working point with optimal efficiency at any time.
Since the hybrid system of the hybrid vehicle can be in different operation modes, how to determine the system energy loss rate L will be described below for three different modes, respectively MX 。
When the vehicle is in a normal gear mode, i.e. when the engine is used as the main output power source, the working interval of the engine is firstly considered to be optimized, and then the efficiency of the first motor and the second motor is combined to optimize the efficiency of the whole system. The lost power and the effective power of the engine are determined by the rotating speed and the torque of the engine, the rotating speed of the engine can be determined by the current vehicle speed in a gear mode, and the engine is mainly operated at an operating point with relatively optimal efficiency by determining the torque of the engine.
FIG. 2 illustrates a flow chart of a method 200 of hybrid vehicle efficiency optimization in accordance with one embodiment of the invention. As shown in fig. 2, the method 200 includes: step S201, determining the current speed of the vehicle and the engine torque corresponding to the speed; step S202, calculating the energy loss power of the vehicle according to the engine torque; step S203, adjusting the engine torque by an adjustment step; step S204, calculating energy loss power corresponding to the adjusted engine torque; step S205, repeating the above steps until the adjusted engine torque reaches the limit torque set value; and step S206, comparing all the power loss obtained by repeating the above steps to determine the minimum power loss of the vehicle.
Step S201 includes determining a current speed of the vehicle and an engine torque corresponding to the speed. Specifically, a range of torque capacities of the engine, i.e., torque maximum/torque minimum, may be first determined and the engine torque corresponding to the current speed may be determined from the current speed of the vehicle.
Step S202 includes calculating a loss of power of the vehicle based on the engine torque. Specifically, a torque may be determined from the minimum torque with a fixed step torque within the range determined in step S201, and then the effective mechanical power T of the engine may be calculated based on the torque and the current rotational speed Eng . By means of table look-up, the effective mechanical power T can be calculated Eng Determining engine energy consumption lost power L under current torque and rotation speed in an effective power-lost power correspondence table (map) Eng . Since the first electric machine and the engine are connected at a fixed speed ratio, the rotational speed of the first electric machine may be determined from the rotational speed of the engine such that the torque of the first electric machine may be calculated from the driver demand torque and the engine torque. Specifically, the torque of the first motor= (engine torque-driver demand torque) × (-1).
In this case, the torque result of the first motor is negative. Meanwhile, the rotating speed of the second motor can be calculated according to the speed of the current vehicle and the speed ratio of the transmission end, so that,
torque of the second motor= (driver demand torque-engine torque), the calculation result is a positive value. Calculating the effective mechanical power T of the first motor according to the rotating speed and the torque of the first motor MtrA . Also calculate the energy loss power L according to the effective power-loss power corresponding table (map) MtrA The method comprises the steps of carrying out a first treatment on the surface of the Similarly, calculating T according to the rotation speed and torque of the second motor MtrB And L MtrB . At the time of calculating T Eng 、L Eng 、T MtrA 、L MtrA 、T MtrB 、L MtrB The system energy loss rate L at the current vehicle speed can then be calculated according to equation 1 shown above MX1 。
Step S203 includes adjusting the engine torque in an adjustment step. Specifically, a specific torque adjustment step size (e.g., 5n·m) may be set.
Step S204 includes calculating the energy loss power corresponding to the adjusted engine torque, by setting the adjustment step torque in step S203, and then adding the set adjustment torque of the fixed step to the current torque to obtain a new torque value and a new L according to the method in step S202 MX2 。
Step S205 includes repeating the above steps until the adjusted engine torque reaches the limit torque setting. Specifically, according to steps S202, S203 and S204, L corresponding to each adjustment step is calculated in turn MX3 、L MX4 、L MX5 … until the current torque reaches a limit torque setting, which may be a maximum torque value set by the user or a maximum torque capacity value of the system. For example, the engine torque may be added to the fixed step torque until the maximum torque is reached.
The final step S206 includes comparing all the power loss obtained by repeating the above steps to determine the minimum power loss of the vehicle. Specific comparison L MX1 -L MXn Is of the size of (a)Obtaining L MX Torque and rotational speed values of the engine and the first and second motors at a minimum value. This L MX The minimum value is the working point with the optimal system efficiency under the current vehicle speed. Alternatively, the torque and rotational speed values of the engine and the first and second electric machines may be adjusted to L MX The torque value and the rotating speed value corresponding to the minimum value can keep the whole system at the minimum energy loss.
Alternatively, a vehicle speed threshold range (e.g., + -10 KM/h) may also be set. When the vehicle speed variation is outside the vehicle speed threshold range, the calculation of L is restarted MX Minimum value. This is because the running condition of the vehicle may be changed in real time, and when the vehicle speed changes beyond the threshold value, the above L can be considered MX The cycle period has ended. A new round of L can be started from the minimum torque point MX Is calculated by the computer. Continuously update L MX The minimum value and the torque values of the corresponding engine and motor, thereby realizing that the system is at the working point with optimal efficiency in real time.
When the vehicle is not in the gear mode, but in the EREV mode, the energy loss power L can be calculated using a similar method MX But the specific steps are slightly different.
FIG. 3 illustrates a flow chart of a method 300 of hybrid vehicle efficiency optimization in accordance with one embodiment of the invention. As shown in fig. 3, the method 300 includes: step S301, determining the current speed of the vehicle and the engine speed corresponding to the speed; step S302, calculating the energy loss power of the vehicle according to the engine speed; step S303, adjusting the engine speed by an adjustment step; step S304, calculating energy loss power corresponding to the adjusted engine speed; step S305, repeating the above steps until the adjusted engine speed reaches the limit speed setting; and step S306, comparing all the energy loss power obtained by repeating the steps to determine the minimum energy loss power of the vehicle.
Step S301 includes determining a current speed of the vehicle and an engine speed corresponding to the speed. Specifically, a range of rotational speed capabilities of the engine, i.e., a rotational speed maximum/minimum, may first be determined and an engine rotational speed corresponding to a current speed may be determined from the current speed of the vehicle.
Step S302 includes calculating energy loss power of the vehicle based on the engine speed. Specifically, a rotation speed may be determined from the maximum rotation speed at a fixed step rotation speed within the range determined in step S301, and then the effective mechanical power T of the engine may be calculated based on the rotation speed and the current rotation speed Eng . By means of table look-up, the effective mechanical power T can be calculated Eng Determining engine energy consumption lost power L under current torque and rotation speed in an effective power-lost power correspondence table (map) Eng . The torque and speed of the first motor can be calculated when the engine torque and speed are determined, since the torque and speed of the first motor can be obtained by a fixed speed ratio shift connected to the engine, and the effective mechanical power T of the first motor can be calculated MtrA And energy loss power L MtrA The method comprises the steps of carrying out a first treatment on the surface of the The rotation speed of the second motor is converted from the current speed, the torque is converted from the torque required by the driver, and the effective mechanical power T is obtained by the same method MtrB And energy loss power L MtrB . At the time of calculating T Eng 、L Eng 、T MtrA 、L MtrA 、T MtrB 、L MtrB The system energy loss rate L at the current vehicle speed can then be calculated according to equation 1 shown above MX1 。
Step S303 includes adjusting the engine speed in an adjustment step. Specifically, a specific rotational speed adjustment step size (e.g., 100 r/min) may be set.
Step S304 includes calculating the energy loss power corresponding to the adjusted engine speed, by setting the adjustment step speed in step S303, and then subtracting the adjustment step speed from the existing speed to obtain a new speed value and a new L according to the method of step S302 MX2 。
Step S305 includes repeating the above steps until the adjusted engine speed reaches the limit speed setting. Specifically, according to steps S302, S303 and S304, andsequentially calculating L corresponding to each adjustment step MX3 、L MX4 、L MX5 … until the current rotational speed reaches a limit rotational speed set value, wherein the limit rotational speed set value may be a maximum rotational speed value set by a user or a minimum rotational speed capability value of the system. For example, the engine speed may be subtracted by a fixed step speed until a minimum speed is reached.
The final step S306 includes comparing all the power loss obtained by repeating the above steps to determine the minimum power loss of the vehicle. Specific comparison L MX1 -L MXn To obtain L MX Torque and rotational speed values of the engine and the first and second motors at a minimum value. This L MX The minimum value is the working point with the optimal system efficiency under the current vehicle speed. Alternatively, the torque and rotational speed values of the engine and the first and second electric machines may be adjusted to L MX The torque value and the rotating speed value corresponding to the minimum value can keep the whole system at the minimum energy loss.
Alternatively, a vehicle speed threshold range (e.g., + -10 KM/h) may also be set. When the vehicle speed variation is outside the vehicle speed threshold range, the calculation of L is restarted MX Minimum value. This is because the running condition of the vehicle may be changed in real time, and when the vehicle speed changes beyond the threshold value, the above L can be considered MX The cycle period has ended. A new round of L can be started from the minimum torque point MX Is calculated by the computer. Continuously update L MX The minimum value and the torque values of the corresponding engine and motor, thereby realizing that the system is at the working point with optimal efficiency in real time.
Finally, when the vehicle is not in the gear mode, but in the EV mode, the energy loss power L can be calculated using a similar method MX But the specific steps are slightly different. In EV mode, only the second motor is operated, so that only the minimum power loss L of the second motor is calculated MX And (3) obtaining the product.
FIG. 4 illustrates a flow chart of a method 400 of hybrid vehicle efficiency optimization in accordance with one embodiment of the invention. As shown in fig. 4, the method 400 includes the steps of: step S401, determining the current speed of the vehicle and the second motor rotating speed corresponding to the speed; step S402, calculating the energy loss power of the vehicle according to the second motor rotating speed; step S403, adjusting the rotating speed of the second motor by an adjusting step; step S404, calculating the energy loss power corresponding to the adjusted second motor rotation speed; step S405, repeating the above steps until the adjusted engine speed reaches a limit speed setting; and step S406, comparing all the power loss obtained by repeating the above steps to determine the minimum power loss of the vehicle.
Method 400 is similar to method 200 and method 300, except that only the effective mechanical power T of the second motor is calculated in method 400 MtrB And energy loss power L MtrB Further calculate the minimum power loss L MX Determining L MX And the rotation speed and torque point with optimal system efficiency are the smallest.
The invention also provides a system corresponding to the method 200, the method 300 and the method 400, which are used for realizing the efficiency optimization method. Specifically, FIG. 5 illustrates a hybrid vehicle efficiency optimization system 500 in accordance with one embodiment of the invention. The system 500 includes: an electronic control unit 501, said electronic control unit 501 being configured to determine a current speed of the vehicle and an engine speed corresponding to said speed; a processor unit 502, the processor unit 502 being configured to execute instructions; a storage unit 503 storing instructions that, when executed, cause the processor unit to: calculating the energy loss power of the vehicle according to the engine speed; adjusting the engine speed with an adjustment step; calculating energy loss power corresponding to the adjusted engine speed; repeating the steps until the adjusted engine speed reaches a limit speed setting value; and comparing all the energy loss power obtained by repeating the steps to determine the minimum energy loss power of the vehicle. The system 500 may be used to implement the above method 200.
Fig. 6 illustrates a hybrid vehicle efficiency optimization system 600 in accordance with one embodiment of the invention. The system 600 includes: an electronic control unit 601, the electronic control unit 601 being configured to determine a current speed of the vehicle and a second motor speed corresponding to the speed; a processor unit 602, the processor unit 602 being configured to execute instructions; a storage unit 603 storing instructions that, when executed, cause the processor unit to: calculating the energy loss power of the vehicle according to the second motor rotating speed; adjusting the rotating speed of the second motor by an adjusting step length; calculating energy loss power corresponding to the adjusted second motor rotating speed; repeating the steps until the adjusted engine speed reaches a limit speed setting value; and comparing all the energy loss power obtained by repeating the steps to determine the minimum energy loss power of the vehicle. The system 600 may be used to implement the above method 300.
Fig. 7 illustrates a hybrid vehicle efficiency optimization system 700 in accordance with one embodiment of the invention. The system 700 includes: an electronic control unit 701, the electronic control unit 701 being configured to determine a current speed of the vehicle and a second motor speed corresponding to the speed; a processor unit 702, the processor unit 702 being configured to execute instructions; a memory unit 703 storing instructions that, when executed, cause the processor unit to: calculating the energy loss power of the vehicle according to the second motor rotating speed; adjusting the rotating speed of the second motor by an adjusting step length; calculating energy loss power corresponding to the adjusted second motor rotating speed; repeating the steps until the adjusted engine speed reaches a limit speed setting value; and comparing all the energy loss power obtained by repeating the steps to determine the minimum energy loss power of the vehicle. The system 700 may be used to implement the above method 400.
Optionally, when the system is in a specific mode (e.g. in gear or EV mode), the system rotation speed and torque point when the energy loss rate L is minimum can be determined according to the control method herein to be the working point with the optimal system efficiency, and in addition, the L corresponding to each mode can be compared in real time MX And determining which mode has the optimal efficiency, and then switching the system to the mode with the optimal efficiency.
In addition, the parameter F in the first formula contains factors such as SOC and SOH of the high-voltage battery, and the calculation of the energy loss rate of the system is affected by the own requirements of the factors, so that the calculation result tends to meet the requirements of the factors. The factors in F can influence the calculation of the final energy loss rate L by a table lookup method, the numerical values in the table are determined by a test mode according to the respective factor requirements according to different vehicle types and different part characteristics. The method and the system can finally ensure that the system efficiency of the hybrid system can be optimized in real time under the conditions of different working conditions, different battery charge states, different battery lives, NVH, emission requirements and the like, and the aim of realizing the optimal fuel economy at any moment can be fulfilled.
Fig. 8 is a schematic block diagram of a computer device in accordance with yet another embodiment of the present invention. The computer device comprises a memory, a processor, and a computer program stored on the memory and executable on the processor. The processor runs the program to implement the above hybrid vehicle efficiency optimization method.
According to another aspect of the present invention, there is also provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described hybrid vehicle efficiency optimization method.
The embodiments and examples set forth herein are presented to best explain the embodiments in accordance with the present technology and its particular application and to thereby enable those skilled in the art to make and use the invention. However, those skilled in the art will recognize that the foregoing description and examples have been presented for the purpose of illustration and example only. The description as set forth is not intended to cover various aspects of the invention or to limit the invention to the precise form disclosed.
Claims (20)
1. A method of optimizing efficiency of a hybrid vehicle, the hybrid vehicle including a first electric machine, a second electric machine, and an engine, the method comprising the steps of:
determining the current speed of a vehicle and the engine torque corresponding to the speed;
calculating the energy loss power of the vehicle according to the engine torque;
adjusting the engine torque in an adjustment step;
calculating energy loss power corresponding to the adjusted engine torque;
repeating the steps until the adjusted engine torque reaches a limit torque setting; and
comparing all the power loss obtained by repeating the steps to determine the minimum power loss of the vehicle.
2. The method of optimizing efficiency of a hybrid vehicle of claim 1, wherein the respective torques and speeds of the first and second electric machines and the engine are determined based upon a minimum power loss of the vehicle.
3. The method of hybrid vehicle efficiency optimization of claim 2, wherein the energy loss power of the vehicle is calculated from one or more of the following data: effective mechanical power T of the engine ENG Energy loss power L of engine Eng Effective mechanical power T of the first motor MtrA Energy loss power L of first motor MtrA Effective mechanical power T of the second motor MtrB Energy loss power L of second motor MtrB 。
4. A method of hybrid vehicle efficiency optimization as recited in claim 3 wherein the adjustment is an increase/decrease of the speed-corresponding engine torque by the adjustment step.
5. A method of optimizing efficiency of a hybrid vehicle, the hybrid vehicle including a first electric machine, a second electric machine, and an engine, the method comprising the steps of:
determining the current speed of the vehicle and the engine speed corresponding to the speed;
calculating the energy loss power of the vehicle according to the engine speed;
adjusting the engine speed with an adjustment step;
calculating energy loss power corresponding to the adjusted engine speed;
repeating the steps until the adjusted engine speed reaches a limit speed setting value; and
comparing all the power loss obtained by repeating the steps to determine the minimum power loss of the vehicle.
6. The method of optimizing efficiency of a hybrid vehicle of claim 5 wherein the respective torques and speeds of the first and second electric machines and the engine are determined based upon a minimum power loss of the vehicle.
7. The method of hybrid vehicle efficiency optimization of claim 6, wherein the energy loss power of a vehicle is calculated from one or more of the following data: effective mechanical power T of the engine ENG Energy loss power L of engine Eng Effective mechanical power T of the first motor MtrA Energy loss power L of first motor MtrA Effective mechanical power T of the second motor MtrB Energy loss power L of second motor MtrB 。
8. The method of hybrid vehicle efficiency optimization of claim 7, wherein the adjustment is increasing/decreasing the speed-corresponding engine speed by the adjustment step.
9. A method of optimizing efficiency of a hybrid vehicle, the hybrid vehicle including a first electric machine, a second electric machine, and an engine, the method comprising the steps of:
determining the current speed of the vehicle and the second motor rotating speed corresponding to the speed;
calculating the energy loss power of the vehicle according to the second motor rotating speed;
adjusting the rotating speed of the second motor by an adjusting step length;
calculating energy loss power corresponding to the adjusted second motor rotating speed;
repeating the steps until the adjusted engine speed reaches a limit speed setting value; and
comparing all the power loss obtained by repeating the steps to determine the minimum power loss of the vehicle.
10. A system for efficiency optimization of a hybrid vehicle, the hybrid vehicle including a first electric machine, a second electric machine, and an engine, the system comprising:
an electronic control unit configured to determine a current speed of the vehicle and an engine torque corresponding to the speed;
a processor unit configured to execute instructions;
a memory unit storing instructions that, when executed, cause the processor unit to:
calculating the energy loss power of the vehicle according to the engine torque;
adjusting the engine torque in an adjustment step;
calculating energy loss power corresponding to the adjusted engine torque;
repeating the steps until the adjusted engine torque reaches a limit torque setting; and
comparing all the power loss obtained by repeating the steps to determine the minimum power loss of the vehicle.
11. The system for hybrid vehicle efficiency optimization of claim 10, wherein the respective torques and speeds of the first and second electric machines and the engine are determined based upon a minimum power loss of the vehicle.
12. The system for hybrid vehicle efficiency optimization of claim 11, wherein the system is based on one of the following dataOne or more terms to calculate the energy loss power of the vehicle: effective mechanical power T of the engine ENG Energy loss power L of engine Eng Effective mechanical power T of the first motor MtrA Energy loss power L of first motor MtrA Effective mechanical power T of the second motor MtrB Energy loss power L of second motor MtrB 。
13. The hybrid vehicle efficiency optimization system of claim 12, wherein the adjustment is to add/subtract the speed-corresponding engine torque by the adjustment step.
14. A system for efficiency optimization of a hybrid vehicle, the hybrid vehicle including a first electric machine, a second electric machine, and an engine, the system comprising:
an electronic control unit configured to determine a current speed of the vehicle and an engine speed corresponding to the speed;
a processor unit configured to execute instructions;
a memory unit storing instructions that, when executed, cause the processor unit to:
calculating the energy loss power of the vehicle according to the engine speed;
adjusting the engine speed with an adjustment step;
calculating energy loss power corresponding to the adjusted engine speed;
repeating the steps until the adjusted engine speed reaches a limit speed setting value; and
comparing all the power loss obtained by repeating the steps to determine the minimum power loss of the vehicle.
15. The system for hybrid vehicle efficiency optimization of claim 14, wherein the respective torques and speeds of the first and second electric machines and the engine are determined based upon a minimum power loss of the vehicle.
16. The hybrid vehicle efficiency optimization system of claim 15, wherein the energy loss power of the vehicle is calculated from one or more of the following data: effective mechanical power T of the engine ENG Energy loss power L of engine Eng Effective mechanical power T of the first motor MtrA Energy loss power L of first motor MtrA Effective mechanical power T of the second motor MtrB Energy loss power L of second motor MtrB 。
17. The hybrid vehicle efficiency optimization system of claim 16, wherein the adjustment is to increase/decrease the speed-corresponding engine speed by the adjustment step.
18. A system for efficiency optimization of a hybrid vehicle, the hybrid vehicle including a first electric machine, a second electric machine, and an engine, the system comprising:
an electronic control unit configured to determine a current speed of the vehicle and a second motor speed corresponding to the speed;
a processor unit configured to execute instructions;
a memory unit storing instructions that, when executed, cause the processor unit to:
calculating the energy loss power of the vehicle according to the second motor rotating speed;
adjusting the rotating speed of the second motor by an adjusting step length;
calculating energy loss power corresponding to the adjusted second motor rotating speed;
repeating the steps until the adjusted engine speed reaches a limit speed setting value; and
comparing all the power loss obtained by repeating the steps to determine the minimum power loss of the vehicle.
19. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor runs the computer program to implement:
the method of any one of claims 1-9.
20. A computer readable storage medium having stored thereon a computer program, the computer program being implementable when executed by a processor:
the method of any one of claims 1-9.
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| CN117984988A (en) * | 2024-04-07 | 2024-05-07 | 西安建筑科技大学 | Hybrid power control method and system based on bionic dynamic system |
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| CN117984988A (en) * | 2024-04-07 | 2024-05-07 | 西安建筑科技大学 | Hybrid power control method and system based on bionic dynamic system |
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