CN111873812B - Vehicle torque determination method and device - Google Patents
Vehicle torque determination method and device Download PDFInfo
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- CN111873812B CN111873812B CN202011032926.0A CN202011032926A CN111873812B CN 111873812 B CN111873812 B CN 111873812B CN 202011032926 A CN202011032926 A CN 202011032926A CN 111873812 B CN111873812 B CN 111873812B
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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
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/10—Vehicle control parameters
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/10—Vehicle control parameters
- B60L2240/12—Speed
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/423—Torque
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/44—Drive Train control parameters related to combustion engines
- B60L2240/443—Torque
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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
- Y02T10/72—Electric energy management in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Hybrid Electric Vehicles (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
The invention provides a vehicle torque determination method and device, aiming at solving the problem of low engine thermal efficiency caused by unstable engine torque in the prior art. The vehicle torque determination method of the invention includes: acquiring the state of charge and the speed of a vehicle; determining the starting torque of the engine according to the state of charge and the vehicle speed; acquiring the opening degree of an accelerator pedal of a vehicle; determining a required torque according to the opening degree of an accelerator pedal and the vehicle speed; comparing the required torque with the starting torque; executing a torque control step if the required torque is greater than or equal to the starting torque, wherein the torque control step comprises the following steps: determining a target torque of the engine according to the vehicle speed, and correcting according to the power of the air conditioner accessory and the current SOC; controlling the engine to output an engine target torque; determining a motor target torque according to the required torque; controlling the motor to output a motor target torque; and if the required torque is smaller than the starting torque, controlling the engine to stop running, and returning to the step of acquiring the state of charge and the speed of the vehicle.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to a vehicle torque determination method and device.
Background
The engine and motor torque distribution method of the hybrid electric vehicle is a core technology and is the key for realizing the fuel economy and the cleanness and environmental protection of the vehicle.
The common torque distribution strategy is a torque distribution strategy based on a determination rule, and the main idea of the strategy is that from the viewpoint of optimizing the thermal efficiency of an engine, the working point of the engine is shifted by adjusting the charging torque of a motor, so that the engine can work in a high-efficiency interval as much as possible. However, the existing rule-based energy management strategy needs to make rules by depending on experience and energy consumption efficiency of an engine bench, is difficult to adapt to various actual working conditions and dynamic change requirements, has large fluctuation of engine torque along with an accelerator pedal, and is difficult to realize optimal control.
When the engine of the single-motor hybrid electric vehicle runs, because the driving demand torque is different at each moment when a driver drives the vehicle, the opening degree of the accelerator pedal is different, the torque of the engine and the motor is required to be adjusted by the power system all the time to meet the torque response demand of the driver, and the combustion state of the engine is deteriorated due to the continuous change of the torque of the engine in the process, so that the heat efficiency of the engine is reduced, and the oil consumption is high.
Therefore, it is necessary to provide a solution to the technical problem of low engine thermal efficiency caused by unstable engine torque in the prior art.
Disclosure of Invention
The invention provides a vehicle torque determination method and a vehicle torque determination device, aiming at solving the technical problem of low engine thermal efficiency caused by unstable engine torque in the prior art.
The invention provides a vehicle torque determination method, which comprises the following steps:
acquiring the state of charge and the speed of a vehicle;
determining the starting torque of the engine according to the state of charge and the vehicle speed;
acquiring the opening degree of an accelerator pedal of the vehicle;
determining a required torque according to the opening degree of the accelerator pedal and the vehicle speed;
comparing the required torque with the starting torque;
executing a torque control step if the required torque is greater than or equal to the start-up torque, wherein the torque control step comprises: determining an engine target torque according to the vehicle speed; controlling the engine to output the engine target torque; determining a motor target torque according to the required torque; controlling the motor to output the motor target torque;
and if the required torque is smaller than the starting torque, controlling the engine to stop running, and returning to the step of acquiring the state of charge and the speed of the vehicle.
In a further improvement of the vehicle torque determination method of the invention, the determining an engine target torque based on the vehicle speed includes:
determining running resistance and engine common rotating speed according to the vehicle speed, and determining basic torque of the engine according to the vehicle speed, the running resistance and the engine common rotating speed;
acquiring the total power of electric equipment of the vehicle, and determining a first correction torque of the engine according to the total power of the electric equipment;
acquiring a balance point of a state of charge, and determining a second correction torque according to the state of charge and the balance point of the state of charge;
determining a state of charge change rate according to the state of charge, determining battery power according to the state of charge change rate, and determining a third correction torque according to the battery power and the common rotating speed of the engine;
and determining the target engine torque according to the basic torque, the first correction torque, the second correction torque and the third correction torque.
In a still further improvement of the vehicle torque determination method of the invention, the determining of the motor target torque based on the required torque includes:
acquiring actual torque, an engine gear and a motor gear of an engine;
and determining the motor target torque according to the required torque, the actual torque of the engine, the engine gear and the motor gear.
In a still further improvement of the vehicle torque determination method of the invention, the determining the motor target torque based on the required torque, the actual torque of the engine, the engine gear, and the motor gear includes:
determining an engine gear ratio based on the engine gear;
determining a motor transmission ratio according to the motor gear;
and determining the motor target torque according to the required torque, the actual torque of the engine, the engine transmission ratio and the motor transmission ratio.
In a further improvement of the vehicle torque determination method of the present invention, if the required torque is greater than or equal to the cranking torque, after the torque control step, the method further includes:
judging whether the opening degree of the accelerator pedal meets a shutdown condition, wherein the shutdown condition is that the duration of the opening degree of the accelerator pedal being smaller than a preset opening degree is longer than a preset duration;
if the shutdown condition is met, controlling the engine to stop, and returning to the step of acquiring the state of charge and the speed of the vehicle;
and if the stop condition is not met, returning to the step of executing the torque control.
In addition, the invention also provides a vehicle torque determination device which is used for executing the method and comprises a first acquisition module, a starting torque determination module, a second acquisition module, a required torque determination module, a comparison module, a first control module and a second control module;
the first acquisition module is used for acquiring the state of charge and the speed of the vehicle;
the starting torque determining module is used for determining the starting torque of the engine according to the state of charge and the vehicle speed;
the second acquisition module is used for acquiring the opening degree of an accelerator pedal of the vehicle;
the required torque determining module is used for determining required torque according to the opening degree of the accelerator pedal and the vehicle speed;
the comparison module is used for comparing the required torque with the starting torque;
the first control module is used for carrying out torque control when the required torque is larger than or equal to the starting torque, and comprises an engine torque control unit and a motor torque control unit; the engine torque control unit is used for determining an engine target torque according to the vehicle speed and controlling the engine to output the engine target torque; the motor torque control unit is used for determining a motor target torque according to the required torque and controlling the motor to output the motor target torque;
the second control module is used for controlling the engine to stop running and triggering the first obtaining module when the required torque is smaller than the starting torque.
A further improvement of the vehicle torque determination apparatus of the present invention resides in that the engine torque control unit includes an engine target torque determination subunit operable to: determining running resistance and engine common rotating speed according to the vehicle speed, and determining basic torque of the engine according to the vehicle speed, the running resistance and the engine common rotating speed;
acquiring the total power of electric equipment of the vehicle, and determining a first correction torque of the engine according to the total power of the electric equipment;
acquiring a balance point of a state of charge, and determining a second correction torque according to the state of charge and the balance point of the state of charge;
determining a state of charge change rate according to the state of charge, determining battery power according to the state of charge change rate, and determining a third correction torque according to the battery power and the common rotating speed of the engine;
and determining the target engine torque according to the basic torque, the first correction torque, the second correction torque and the third correction torque.
A still further improvement of the vehicle torque determination apparatus of the present invention resides in that the motor torque control unit includes a motor target torque determination subunit operable to: acquiring actual torque, an engine gear and a motor gear of an engine;
and determining the motor target torque according to the required torque, the actual torque of the engine, the engine gear and the motor gear.
A still further improvement of the vehicle torque determination device of the present invention resides in that the motor target torque determination subunit is operable to: determining an engine gear ratio based on the engine gear;
determining a motor transmission ratio according to the motor gear;
and determining the motor target torque according to the required torque, the actual torque of the engine, the engine transmission ratio and the motor transmission ratio.
In a further refinement of the vehicle torque determination apparatus of the present invention, the control module further includes a second shutdown control submodule for: after the torque control submodule carries out torque control, judging whether the opening degree of the accelerator pedal meets a stop condition, wherein the stop condition is that the duration of the opening degree of the accelerator pedal, which is smaller than a preset opening degree, is longer than a preset duration; if the stop condition is met, controlling the engine to stop and triggering the first acquisition module; and if the shutdown condition is not met, triggering the torque control submodule.
By adopting the technical scheme, the vehicle torque determining method and the vehicle torque determining device provided by the invention have the following beneficial effects: the invention is applied to a single-motor hybrid power system, so that the engine can work with stable torque and the efficiency of the engine can be improved. The invention is used for distributing the torque of the engine and the motor, and the torque of the engine is kept at a certain value for a long time or slowly changes near the value, so that the working condition of the engine is stable, and the thermal efficiency is higher; meanwhile, the torque of the motor is controlled, so that the torque of the engine is matched with the torque of the motor, and the torque requirement required by driving is met; once the engine is started, the engine can work at stable torque for a long time, and the engine is high in efficiency and low in oil consumption.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a vehicle torque determination method according to embodiment 1 of the present invention.
Fig. 2 is a flowchart of a method for determining a target engine torque according to a vehicle speed in embodiment 1 of the present invention.
Fig. 3 is a flowchart of a method for determining a target torque of the motor according to the required torque in embodiment 1 of the present invention.
Fig. 4 is a block diagram of a vehicle torque determination device provided in embodiment 2 of the invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a vehicle torque determination method and device, aiming at solving the technical problem of low engine thermal efficiency caused by unstable engine torque in the prior art.
Example 1:
referring to fig. 1 to 3, a vehicle torque determination method provided in embodiment 1 includes:
step S101: acquiring the state of charge and the speed of a vehicle;
step S102: determining the starting torque of the engine according to the state of charge and the vehicle speed;
step S103: acquiring the opening degree of an accelerator pedal of a vehicle;
step S104: determining a required torque according to the opening degree of an accelerator pedal and the vehicle speed;
step S105: comparing the required torque with the starting torque;
step S106: executing a torque control step if the required torque is greater than or equal to the starting torque, wherein the torque control step comprises the following steps: determining an engine target torque according to the vehicle speed; controlling the engine to output an engine target torque; determining a motor target torque according to the required torque; controlling the motor to output a motor target torque;
step S107: and if the required torque is smaller than the starting torque, controlling the engine to stop running, and returning to the step of acquiring the state of charge and the speed of the vehicle.
In embodiment 1, if the required torque is greater than or equal to the start torque, which indicates that the driver wishes to start the engine at the moment, the engine operation request flag is set to 1, and the torque control step is executed to control the engine to output the target engine torque, so that the engine can be started and operated; if the required torque is smaller than the starting torque, which indicates that the driver does not want the engine to start at the moment, the engine operation request mark position 0 sends an engine stop operation request to the engine controller, and the steps of acquiring the charge state and the vehicle speed of the vehicle are executed again in the next operation period of the vehicle controller, so that the engine does not start at the moment.
The existing single-motor hybrid power system can not enable the engine to work with stable torque, the torque of the engine changes along with the change of an accelerator pedal of a driver, the engine is in a transient working condition for a long time, and the thermal efficiency is poor. The present embodiment 1 determines the engine base torque among the engine target torques according to the vehicle speed by completely decoupling the engine target torque from the driver's accelerator pedal, and since the vehicle speed changes continuously and with a small magnitude, the engine base torque may be kept stable or slowly changed, and thus the engine target torque may be kept relatively stable or slowly changed.
In addition, in the embodiment 1, the target torque of the motor can be determined according to the required torque, and the engine and the motor can be coordinately controlled by controlling the engine torque and the motor torque simultaneously, so as to meet the torque required by the driver.
In embodiment 1, the calibrated starting torque of the engine may be determined according to the state of charge, the vehicle speed, and the preset corresponding relationship. When the torque actually output by the engine reaches the start torque, the engine is started.
Further, determining the engine target torque according to the vehicle speed includes:
step S201: determining running resistance and engine common rotating speed according to the vehicle speed, and determining basic torque of the engine according to the vehicle speed, the running resistance and the engine common rotating speed;
step S202: acquiring the total power of electric equipment of a vehicle, and determining a first correction torque of an engine according to the total power of the electric equipment;
step S203: acquiring a balance point of the state of charge, and determining a second correction torque according to the state of charge and the balance point of the state of charge;
step S204: determining a state of charge change rate according to the state of charge, determining battery power according to the state of charge change rate, and determining a third correction torque according to the battery power and the common rotating speed of the engine;
step S205: and determining the target torque of the engine according to the basic torque, the first correction torque, the second correction torque and the third correction torque.
In embodiment 1, the engine normal rotation speed is a middle value of the engine normal rotation speed interval, and the engine basic torque is determined according to the following formula: engine base torque = running resistance vehicle speed 9550/engine common speed. Determining a first correction torque according to the sum of the power of all electric equipment of the vehicle, wherein the first correction torque = the total power of the electric equipment 9550/1000, so as to ensure that the engine power corresponding to the first correction torque can meet the use of the electric equipment at any rotating speed; the electric equipment comprises an air conditioner, air conditioner accessories and the like. The balance point of the state of charge may be a preset parameter, for example, the balance point of the state of charge may be 20% state of charge; the state of charge is a positive value when the state of charge is lower than the balance point, and the larger the difference between the state of charge and the balance point is, the larger the absolute value of the second correction torque is; the state of charge is a negative value above the balance point, and the larger the state of charge and balance point interpolation is, the larger the absolute value of the second correction torque is. The soc change rate may be a soc change rate in a period from the power-on of the entire vehicle, for example, the soc change rate may be determined according to the soc within 20S from the power-on of the entire vehicle, the battery power may be calculated according to the soc change rate, and the third correction torque may be calculated, where the third correction torque = the battery power × 9550/the engine common rotation speed intermediate value. And determining the target torque of the engine according to the basic torque, the first correction torque, the second correction torque and the third correction torque, and preferably, limiting the target torque of the engine by a minimum value and a maximum value, and setting the minimum value and the maximum value of the target torque of the engine. The embodiment 1 can also achieve the purpose of SOC balance when the engine torque is stabilized by determining a first correction torque of the engine according to the total power of the electric equipment (for example, air conditioner accessories), determining a second correction torque according to the state of charge and the balance point of the state of charge, and determining a third correction torque according to the battery power and the engine common rotation speed.
Further, determining the motor target torque according to the required torque includes:
step S301: acquiring actual torque, an engine gear and a motor gear of an engine;
step S302: determining an engine gear ratio based on the engine gear;
step S303: determining a motor transmission ratio according to a motor gear;
step S304: and determining the target torque of the motor according to the required torque, the actual torque of the engine, the transmission ratio of the engine and the transmission ratio of the motor.
In the present embodiment 1, the engine torque and the motor torque are simultaneously controlled to output the engine target torque and the motor target torque so as to satisfy the required torque. Determining the basic torque of the engine through the vehicle speed, and keeping the basic torque of the engine stable or slowly changing; simultaneously outputting a motor target torque; the torque requirement of the required torque is met by combining the torque of the motor while the stability of the output torque of the engine is kept. In the present embodiment 1, the motor target torque = (required torque — engine actual torque) × engine gear ratio/motor gear ratio.
With reference to fig. 1, further, if the required torque is greater than or equal to the starting torque, after the step of performing the torque control, the method further includes:
step S108: judging whether the opening degree of an accelerator pedal meets a shutdown condition, wherein the shutdown condition is that the duration of the opening degree of the accelerator pedal being smaller than a preset opening degree is longer than a preset duration;
step S109: if the stopping condition is met, controlling the engine to stop, and returning to the step of acquiring the state of charge and the speed of the vehicle;
step S110: and if the stop condition is not met, returning to the step of executing the torque control.
In embodiment 1, whether the opening degree of an accelerator pedal meets a shutdown condition is judged, if the opening degree of the accelerator pedal is lower than a certain value (the preset opening degree can be 0% to 5%) and reaches a certain time (the preset time can be 0.01S to 30S), an engine is shut down, an engine operation request mark position is 0, a vehicle controller and an engine controller communicate to send an engine operation stop request, and then step S101 is executed; if the stopping condition is not met, the software period calculation work of the vehicle controller is finished, the torque control step is executed in the next software period, and the operation is repeated in a circulating mode.
In this embodiment 1, the vehicle control unit may receive current gear information of the transmission controller, and may send an engine gear and a motor gear; the vehicle control unit can receive the current SOC condition of the battery management system; the vehicle control unit can receive the current motor torque and rotation speed of the motor controller and can send a motor target torque; the vehicle control unit can receive the current accelerator pedal opening, the engine speed and the torque of the engine controller and can send an engine target torque, an engine operation request and an engine stop operation request.
Example 2:
referring to fig. 4, the present embodiment 2 provides a vehicle torque determination apparatus 100 for performing the above method, the apparatus includes a first obtaining module 10, a start-up torque determination module 30, a second obtaining module 20, a required torque determination module 40, a comparison module 50, a first control module 60, and a second control module 70; the first acquisition module 10 is used for acquiring the state of charge and the speed of the vehicle; the starting torque determining module 30 is used for determining the starting torque of the engine according to the state of charge and the vehicle speed; the second obtaining module 20 is used for obtaining the opening degree of an accelerator pedal of the vehicle; the required torque determining module 40 is used for determining required torque according to the opening degree of an accelerator pedal and the vehicle speed; the comparison module 50 is used for comparing the required torque and the starting torque; the first control module 60 is used for performing torque control when the required torque is greater than or equal to the start-up torque, and the first control module 60 comprises an engine torque control unit and a motor torque control unit; the engine torque control unit is used for determining an engine target torque according to the vehicle speed and controlling the engine to output the engine target torque; the motor torque control unit is used for determining a motor target torque according to the required torque and controlling the motor to output the motor target torque; the second control module 70 is configured to control the engine to stop operating and to trigger the first obtaining module 10 when the requested torque is less than the start-up torque.
Further, the engine torque control unit comprises an engine target torque determination subunit for: determining running resistance and engine common rotating speed according to the vehicle speed, and determining basic torque of the engine according to the vehicle speed, the running resistance and the engine common rotating speed; acquiring the total power of electric equipment of a vehicle, and determining a first correction torque of an engine according to the total power of the electric equipment; determining a balance point of the state of charge according to the state of charge, and determining a second correction torque according to the state of charge and the balance point of the state of charge; determining a state of charge change rate according to the state of charge, determining battery power according to the state of charge change rate, and determining a third correction torque according to the battery power and the common rotating speed of the engine; and determining the target torque of the engine according to the basic torque, the first correction torque, the second correction torque and the third correction torque.
Further, the torque control submodule further comprises a motor torque control unit comprising a motor target torque determination subunit for: acquiring actual torque, an engine gear and a motor gear of an engine; and determining the target torque of the motor according to the required torque, the actual torque of the engine, the engine gear and the motor gear.
Still further, the motor target torque determination subunit is configured to: determining an engine gear ratio based on the engine gear; determining a motor transmission ratio according to a motor gear; and determining the target torque of the motor according to the required torque, the actual torque of the engine, the transmission ratio of the engine and the transmission ratio of the motor.
Still further, the control module 60 also includes a second shutdown control submodule 80, the second shutdown control submodule 80 operable to: after the torque control submodule carries out torque control, whether the opening degree of an accelerator pedal meets a stop condition is judged, and the stop condition is that the duration of the opening degree of the accelerator pedal being smaller than a preset opening degree is longer than a preset duration; if the stop condition is met, controlling the engine to stop and triggering the first acquisition module 10; if the shutdown condition is not met, the torque control submodule is triggered.
When an engine of an existing single-motor hybrid electric vehicle runs, because driving requirements of a driver are different at each moment when the driver drives the vehicle, the opening degree of stepping on an accelerator pedal is different, the torque of the engine and the torque of a motor are required to be adjusted by a power system constantly to meet the torque response requirements of the driver, and the combustion state of the engine is deteriorated due to the fact that the torque of the engine is continuously changed in the process, so that the thermal efficiency of the engine is reduced, and oil consumption is high.
The invention is applied to a single-motor hybrid power system, so that the engine can work with stable torque and the efficiency of the engine can be improved. The invention is used for distributing the torque of the engine and the motor, and the torque of the engine is kept at a certain value for a long time or slowly changes near the value, so that the working condition of the engine is stable, and the thermal efficiency is higher; and meanwhile, the torque of the motor is controlled, so that the torque of the engine is matched with the torque of the motor, and the torque requirement required by driving is met. The engine can work at stable torque for a long time once started, and is high in efficiency and low in oil consumption.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A vehicle torque determination method, characterized by comprising:
acquiring the state of charge and the speed of a vehicle;
determining the starting torque of the engine according to the state of charge and the vehicle speed;
acquiring the opening degree of an accelerator pedal of the vehicle;
determining a required torque according to the opening degree of the accelerator pedal and the vehicle speed;
comparing the required torque with the starting torque;
executing a torque control step if the required torque is greater than or equal to the start-up torque, wherein the torque control step comprises: determining an engine target torque according to the vehicle speed; controlling the engine to output the engine target torque; determining a motor target torque according to the required torque; controlling the motor to output the motor target torque;
if the required torque is smaller than the starting torque, controlling the engine to stop running, and returning to the step of acquiring the state of charge and the speed of the vehicle;
wherein said determining an engine target torque based on said vehicle speed comprises:
determining running resistance and engine common rotating speed according to the vehicle speed, and determining basic torque of the engine according to the vehicle speed, the running resistance and the engine common rotating speed;
acquiring the total power of electric equipment of the vehicle, and determining a first correction torque of the engine according to the total power of the electric equipment;
acquiring a balance point of a state of charge, and determining a second correction torque according to the state of charge and the balance point of the state of charge;
determining a state of charge change rate according to the state of charge, determining battery power according to the state of charge change rate, and determining a third correction torque according to the battery power and the common rotating speed of the engine;
and determining the target engine torque according to the basic torque, the first correction torque, the second correction torque and the third correction torque.
2. The vehicle torque determination method according to claim 1, wherein the determining a motor target torque according to the required torque includes:
acquiring actual torque, an engine gear and a motor gear of an engine;
and determining the motor target torque according to the required torque, the actual torque of the engine, the engine gear and the motor gear.
3. The vehicle torque determination method according to claim 2, wherein the determining the motor target torque based on the required torque, the actual torque of the engine, the engine gear, and the motor gear includes:
determining an engine gear ratio based on the engine gear;
determining a motor transmission ratio according to the motor gear;
and determining the motor target torque according to the required torque, the actual torque of the engine, the engine transmission ratio and the motor transmission ratio.
4. The vehicle torque determination method according to claim 1, wherein if the required torque is greater than or equal to the cranking torque, further comprising after performing the torque control step:
judging whether the opening degree of the accelerator pedal meets a shutdown condition, wherein the shutdown condition is that the duration of the opening degree of the accelerator pedal being smaller than a preset opening degree is longer than a preset duration;
if the shutdown condition is met, controlling the engine to stop, and returning to the step of acquiring the state of charge and the speed of the vehicle;
and if the stop condition is not met, returning to the step of executing the torque control.
5. A vehicle torque determination apparatus for performing the method of any one of claims 1 to 4, the apparatus comprising a first obtaining module, a start-up torque determination module, a second obtaining module, a required torque determination module, a comparison module, a first control module, and a second control module;
the first acquisition module is used for acquiring the state of charge and the speed of the vehicle;
the starting torque determining module is used for determining the starting torque of the engine according to the state of charge and the vehicle speed;
the second acquisition module is used for acquiring the opening degree of an accelerator pedal of the vehicle;
the required torque determining module is used for determining required torque according to the opening degree of the accelerator pedal and the vehicle speed;
the comparison module is used for comparing the required torque with the starting torque;
the first control module is used for carrying out torque control when the required torque is larger than or equal to the starting torque, and comprises an engine torque control unit and a motor torque control unit; the engine torque control unit is used for determining an engine target torque according to the vehicle speed and controlling the engine to output the engine target torque; the motor torque control unit is used for determining a motor target torque according to the required torque and controlling the motor to output the motor target torque;
the second control module is used for controlling the engine to stop running and triggering the first obtaining module when the required torque is smaller than the starting torque.
6. The vehicle torque determination device according to claim 5, wherein the engine torque control unit includes an engine target torque determination subunit operable to: determining running resistance and engine common rotating speed according to the vehicle speed, and determining basic torque of the engine according to the vehicle speed, the running resistance and the engine common rotating speed;
acquiring the total power of electric equipment of the vehicle, and determining a first correction torque of the engine according to the total power of the electric equipment;
acquiring a balance point of a state of charge, and determining a second correction torque according to the state of charge and the balance point of the state of charge;
determining a state of charge change rate according to the state of charge, determining battery power according to the state of charge change rate, and determining a third correction torque according to the battery power and the common rotating speed of the engine;
and determining the target engine torque according to the basic torque, the first correction torque, the second correction torque and the third correction torque.
7. The vehicle torque determination device according to claim 6, characterized in that the motor torque control unit includes a motor target torque determination subunit operable to: acquiring actual torque, an engine gear and a motor gear of an engine;
and determining the motor target torque according to the required torque, the actual torque of the engine, the engine gear and the motor gear.
8. The vehicle torque determination device according to claim 7, wherein the motor target torque determination subunit is configured to: determining an engine gear ratio based on the engine gear;
determining a motor transmission ratio according to the motor gear;
and determining the motor target torque according to the required torque, the actual torque of the engine, the engine transmission ratio and the motor transmission ratio.
9. The vehicle torque determination device as defined in claim 5, wherein the control module further includes a second shutdown control submodule for: after the torque control submodule carries out torque control, judging whether the opening degree of the accelerator pedal meets a stop condition, wherein the stop condition is that the duration of the opening degree of the accelerator pedal, which is smaller than a preset opening degree, is longer than a preset duration; if the stop condition is met, controlling the engine to stop and triggering the first acquisition module; and if the shutdown condition is not met, triggering the torque control submodule.
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| CN114312742A (en) * | 2022-01-27 | 2022-04-12 | 重庆金康动力新能源有限公司 | Driving power generation control method and device, storage medium and vehicle control unit |
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