CN112428978A - Control method and device for hybrid electric vehicle - Google Patents
Control method and device for hybrid electric vehicle Download PDFInfo
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- CN112428978A CN112428978A CN201910786651.0A CN201910786651A CN112428978A CN 112428978 A CN112428978 A CN 112428978A CN 201910786651 A CN201910786651 A CN 201910786651A CN 112428978 A CN112428978 A CN 112428978A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—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
- B60W20/00—Control systems specially adapted for hybrid vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/20—Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration
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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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Abstract
The embodiment of the application discloses a control method and a control device of a hybrid electric vehicle, wherein the hybrid electric vehicle provides power through a second motor, the second motor supplies power through a power battery and a first motor, the current torque and the first target torque of the first motor can be obtained according to a mode switching instruction, if the discharge power of the power battery corresponding to the first target torque exceeds the limit, the second target torque of the first motor can be determined according to the preset torque and the current torque, the third target torque of an engine is calculated according to the second target torque, the first motor is controlled to be adjusted to the second target torque from the current torque, and the engine is controlled to work at the third target torque. The torque change of the first motor is limited, so that the adjustment speed of the torque of the first motor is reduced, the first motor can still supply power to the second motor in the adjustment process, the output power of the power battery is not over-limited, and the service life of the power battery is prolonged.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a control method and a control device for a hybrid electric vehicle.
Background
At present, an automobile is used as a vehicle and plays a higher role in daily life of people. A hybrid vehicle is a vehicle in which a drive system of the vehicle is combined by two or more single drive systems capable of operating, and the running power of the vehicle is provided by the single drive systems individually or collectively according to the actual running state of the vehicle. In a general hybrid vehicle, an engine and a motor are used as power sources, the engine can be powered by using diesel oil, gasoline, compressed natural gas and the like as fuels, and the motor can be powered by using a power battery as a power source.
Under normal conditions, the hybrid electric vehicle is in a series mode, a power battery is used as a power supply, and power is supplied through a motor. When the output power of the power battery can not meet the power demand, the series mode can be switched to the parallel mode, and the power battery is prevented from being over-discharged, namely the discharge power of the power battery is over-limited.
However, due to communication delay, the power battery is still prone to overrun during mode switching, and the service life of the power battery is reduced.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present application provide a control method and device for a hybrid vehicle, which prevent a power battery of the vehicle from exceeding a limit by limiting a torque variation of a motor, and improve a service life of the power battery.
The embodiment of the application provides a control method of a hybrid electric vehicle, the hybrid electric vehicle provides power through a second motor, the second motor supplies power through a power battery and a first motor, and the method comprises the following steps:
acquiring a current torque and a first target torque of a first motor according to a mode switching instruction, wherein the mode switching instruction is used for switching from a first mode in which a second motor supplies power to a second mode in which the first motor, the second motor and an engine cooperatively supply power;
if the discharge power of the power battery corresponding to the first target torque exceeds the limit, determining a second target torque of the first motor according to the first target torque and the current torque;
calculating a third target torque of the engine according to the second target torque;
and controlling the first motor to adjust the current torque to a second target torque, and controlling the engine to work at a third target torque.
Optionally, the determining a second target torque of the second motor according to the first target torque and the current torque includes:
judging whether the difference value of the first target torque and the current torque is larger than a preset torque or not;
and if so, taking the sum of the current torque and the preset torque as a second target torque.
Optionally, the determining a second target torque of the second motor according to the preset torque value and the current torque includes:
judging whether the difference value of the first target torque and the current torque is larger than a preset torque or not;
and if not, taking the current torque as a second target torque.
Alternatively, the first target torque of the motor is determined based on a fourth target torque of the engine.
Optionally, after the adjusting the motor, the second target torque is used as the current torque of the motor, and then the method further includes:
acquiring a sixth target torque of the motor after a preset time;
if the discharge power of the power battery corresponding to the sixth target torque exceeds the limit, determining a seventh target torque of the motor according to the sixth target torque and the second target torque;
calculating an eighth target torque of the engine according to the seventh target torque;
and controlling the first motor to adjust the second target torque to a seventh target torque, and controlling the engine to work at an eighth target torque.
The embodiment of the application provides a hybrid vehicle's controlling means, hybrid vehicle provides power through the second motor, the second motor pass through power battery with the power supply of first motor, the device includes:
the device comprises a first torque determination unit, a second torque determination unit and a control unit, wherein the first torque determination unit is used for acquiring the current torque and a first target torque of a first motor according to a mode switching instruction, and the mode switching instruction is used for switching from a first mode in which a second motor provides power to a second mode in which the first motor, the second motor and an engine cooperatively provide power;
a second torque determining unit, configured to determine a second target torque of the first motor according to the first target torque and the current torque if a discharge power of the power battery corresponding to the first target torque exceeds a limit;
a torque calculation unit for calculating a third target torque of the engine according to the second target torque;
and the first control unit is used for controlling the first motor to adjust the current torque to a second target torque and controlling the engine to work at a third target torque.
Optionally, the second torque determination unit includes:
the judging unit is used for judging whether the difference value between the first target torque and the current torque is larger than a preset torque or not if the discharging power of the power battery corresponding to the first target torque exceeds the limit, and activating a third torque determining unit if the difference value is larger than the preset torque;
the third torque determination unit is configured to use a sum of the current torque and the preset torque as a second target torque.
Optionally, the determining unit is further configured to activate a fourth torque determining unit if a difference between the first target torque and the current torque is less than or equal to a preset torque;
the fourth torque determination unit is configured to take the current torque as a second target torque.
Alternatively, the first target torque of the motor is determined based on a fourth target torque of the engine.
Optionally, after the adjusting the motor, the second target torque is used as the current torque of the motor, and then the apparatus further includes:
the torque acquisition unit is used for acquiring a sixth target torque of the motor after preset time;
a fifth torque determination unit, configured to determine a seventh target torque of the motor according to the sixth target torque and the second target torque if a discharge power of a power battery corresponding to the sixth target torque exceeds a limit;
a sixth torque determination unit configured to calculate an eighth target torque of the engine based on the seventh target torque;
and the second control unit is used for controlling the first motor to adjust the second target torque to a seventh target torque and controlling the engine to work at an eighth target torque.
The embodiment of the application provides a control method and a control device of a hybrid electric vehicle, the hybrid electric vehicle provides power through a second motor, the second motor is powered through a power battery and a first motor, the current torque and a first target torque of the first motor can be obtained according to a mode switching instruction, the mode switching instruction is used for switching a first mode of providing power from the second motor to a second mode of cooperatively providing power by the first motor, the second motor and an engine, if the discharge power of the power battery corresponding to the first target torque exceeds a limit, a second target torque of the first motor can be determined according to a preset torque and the current torque, a third target torque of the engine is calculated according to the second target torque, the first motor is controlled to be adjusted from the current torque to the second target torque, and the engine is controlled to work at the third target torque. In the process, the torque change of the first motor is limited, so that the adjustment speed of the torque of the first motor is reduced, the first motor can still supply power to the second motor in the adjustment process, the output power of the power battery cannot exceed the limit, and the service life of the power battery is prolonged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic diagram of a powertrain of a hybrid vehicle according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a control method of a hybrid electric vehicle according to an embodiment of the present application;
fig. 3 is a flowchart of another control method for a hybrid vehicle according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating powertrain parameters during a mode switch provided by an embodiment of the present application;
fig. 5 is a block diagram of a control device of a hybrid vehicle according to an embodiment of the present application.
Detailed Description
The inventor finds that under normal conditions, the hybrid electric vehicle is in a series mode, a power battery is used as a power supply, and power is supplied through a motor. Referring to fig. 1, the electric machine 2 is connected to a transmission mechanism via a clutch 2, the transmission mechanism is connected to a transmission system via an output shaft, and in a series mode, the clutch 1 is closed and the clutch 2 is opened, and the electric machine 2 powers the vehicle. In the process, the power battery supplies power to the motor1, meanwhile, the engine can charge the power battery, and the motor1 can also generate power to supply power to the motor 2.
When the current power of the motor2 cannot meet the power demand, the output power of the power battery is increased, and if the output power of the power battery is limited, the output power of the power battery is possibly out of limit. Therefore, when the current power of the motor2 cannot meet the power demand, the current series mode can be switched to the parallel mode, the clutch 1 is closed, the clutch 2 is also closed, the motor1, the motor2 and the engine simultaneously provide power for the vehicle, and the pressure of a power battery is relieved, wherein the motor is connected with the motor1 through the clutch 1 and the speed change mechanism, and the engine is connected with the motor 1.
However, after the mode switching, the motor1 originally supplying power to the motor2 is adjusted to supply power to the vehicle, and no longer supplies power to the motor1, and during the mode switching, the torque of the motor2 cannot be reduced quickly, so that the output power of the power battery is increased accordingly, and the output power of the power battery is easily caused to exceed the limit.
Based on this, the embodiment of the application provides a control method and device for a hybrid electric vehicle, the hybrid electric vehicle provides power through a second motor, the second motor is powered through a power battery and the first motor, a current torque and a first target torque of the first motor can be obtained according to a mode switching instruction, the mode switching instruction is used for switching a first mode in which the second motor provides power to a second mode in which the first motor, the second motor and an engine cooperatively provide power, if a discharge power of the power battery corresponding to the first target torque exceeds a limit, a second target torque of the first motor can be determined according to a preset torque and the current torque, a third target torque of the engine can be calculated according to the second target torque, the first motor is controlled to be adjusted from the current torque to the second target torque, and the engine is controlled to operate at the third target torque. In the process, the torque change of the first motor is limited, so that the adjustment speed of the torque of the first motor is reduced, the first motor can still supply power to the second motor in the adjustment process, the output power of the power battery cannot exceed the limit, and the service life of the power battery is prolonged.
The following describes in detail a specific implementation of a control method and a control device for a hybrid electric vehicle according to an embodiment of the present application with reference to the accompanying drawings.
Referring to fig. 2, a flowchart of a control method of a hybrid electric vehicle provided by an embodiment of the present application, which is applied to a vehicle controller, may include the following steps.
S101, acquiring the current torque and the first target torque of the first motor according to the mode switching command.
Before obtaining the mode switching instruction, the hybrid electric vehicle provides power through the second motor, and the second motor passes through power battery power supply, and first motor can generate electricity simultaneously and supply the second motor to use. That is, the second motor is operated by the power battery and the second motor.
The mode switching command is a command for switching the working mode of the vehicle, and specifically, the vehicle can be powered by the second motor and switched to be powered by the first motor, the second motor and the engine in a cooperation manner. Generally, the mode switching command may be generated when the output power of the second electric machine cannot satisfy the power demand of the vehicle.
After the mode switching instruction is obtained, the torque of the first motor needs to be adjusted in response to the mode switching instruction, so that the rotating speed of the first motor is the same as that of the second motor, and the power is cooperatively provided. Referring to fig. 1, the clutch 1 can be closed only when the rotation speed of the first electric machine and the rotation speed of the second electric machine are the same, so that the electric machine 1 and the engine are connected to the transmission mechanism.
Therefore, the current torque of the first motor can be obtained first, the current torque of the first motor can be the current torque when the mode switching instruction is received, and at the moment, the first motor supplies power to the second motor; the current torque of the first motor may also be the adjusted current torque after receiving the mode switching instruction, and at this time, the first motor still supplies power to the second motor.
The first target torque of the first electric machine is a theoretical torque of the first electric machine, and may be obtained empirically or from a target torque of the engine.
As a possible implementation, the first target torque of the first electric machine may be obtained according to the target torque of the engine, because the power demand of the whole vehicle is usually allocated to the engine preferentially, and after the target torque of the engine is determined, the first target torque of the first electric machine is determined according to the target torque of the engine and the power demand of the whole vehicle.
And S102, if the discharge power of the power battery corresponding to the first target torque exceeds the limit, determining a second target torque of the second motor according to the preset torque and the current torque.
The first target torque of the first motor, although able to satisfy the power demand of the vehicle, is not necessarily able to satisfy the output limit of the power battery. This is because the second motor is operated by supplying power to the power battery and the second motor before the mode switching, and if the first motor removes the power supply to the second motor in order to provide the power of the vehicle, the power of the second motor is insufficient, and the output power of the power battery is increased accordingly, and at this time, the output power of the power battery is easily overrun.
If the output power of the power battery is not limited or the improved output power of the power battery is not over-limited, the requirement of normal operation of the power battery is met, the first target torque of the second motor can be directly used as the second target torque, and no other determination is needed.
If the adjustment of the first motor from the current torque to the first target torque would cause the discharge power of the power battery to exceed the limit, the first target torque needs to be adjusted. At this time, the second target torque of the first motor may be determined according to the preset torque and the current torque. The preset torque may be a preset torque, the preset torque may be a fixed value, or a torque value related to a time interval for acquiring the current torque of the first motor.
The method includes the steps of determining a second target torque of a first motor according to a preset torque and a current torque, wherein the second target torque of the first motor is determined by judging whether a difference value between the first target torque and the current torque is larger than the preset torque, if so, the difference between the current torque and the first target torque is larger, and after the current torque is adjusted to the first target torque, the adjustment range is too large, so that the discharge power of a power battery is over-limited, and therefore, the sum of the current torque and the preset torque can be used as the second target torque.
The second target torque of the first motor is determined according to the preset torque and the current torque, and specifically, whether a difference value between the first target torque and the current torque is greater than the preset torque is judged, if not, it is shown that the discharge power of the power battery is still exceeded after the current torque is adjusted to the first target torque even though the difference between the current torque and the first target torque is not large, and therefore, the current torque can be used as the second target torque.
And S103, calculating a third target torque of the engine according to the second target torque.
The second target torque is the theoretical torque of the first motor, but the second target torque is the adjusted torque and is smaller than the originally set first target torque, so the second target torque cannot meet the requirement of the whole vehicle, and at the moment, the torque of the engine needs to be adjusted according to the second target torque. Specifically, the third target torque of the engine may be calculated according to the power demand of the entire vehicle and the second target torque of the first motor, so that the second target torque of the first motor and the third target torque of the engine can meet the power demand of the entire vehicle.
And S104, controlling the first motor to adjust the current torque to the second target torque, and controlling the engine to work at the third target torque.
The first motor is controlled to adjust from the current torque to the second target torque, which may be specifically, the second target torque is sent to the motor management system, so that the motor management system adjusts the first motor from the current torque to the second target torque.
The engine is controlled to operate at the third target torque, which may be specifically, the third target torque is sent to the engine management system, so that the engine management system controls the engine to operate at the third target torque.
According to the control method of the hybrid electric vehicle, the hybrid electric vehicle provides power through the second motor, the second motor supplies power through the power battery and the first motor, the current torque and the first target torque of the first motor can be obtained according to the mode switching instruction, the mode switching instruction is used for providing the first mode of the power from the second motor, the first mode is switched to the second mode in which the first motor, the second motor and the engine cooperatively provide the power, if the discharge power of the power battery corresponding to the first target torque exceeds the limit, the second target torque of the first motor can be determined according to the preset torque and the current torque, the third target torque of the engine is calculated according to the second target torque, the first motor is controlled to be adjusted to the second target torque from the current torque, and the engine is controlled to work at the third target torque. In the process, the torque change of the first motor is limited, so that the adjustment speed of the torque of the first motor is reduced, the first motor can still supply power to the second motor in the adjustment process, the output power of the power battery cannot exceed the limit, and the service life of the power battery is prolonged.
In the following, the control method of the hybrid electric vehicle is described in detail with reference to specific scenarios, and referring to fig. 3, for another control method of a hybrid electric vehicle provided in the embodiment of the present application, the method may include the following steps:
and S201, determining a fourth target torque of the engine according to the mode switching command.
Generally, the target torque of the engine is determined according to the power demand of the entire vehicle. Specifically, referring to fig. 1, a target torque tqdm (n) at the clutch 1 end may be determined according to the power demand of the whole vehicle, and the target torque is preferentially distributed to the engine, that is, the fifth target torque of the engine is TqEng1(n) ═ tqdm (n).
After the target torque of the engine is determined, in order to protect the engine, the torque variation of the engine may be limited, specifically, the current torque TqEng1(n-1) of the engine may be detected, and it may be determined whether the difference Δ 1 between the fifth target torque and the current torque satisfies a preset condition: Δ 1< X1, where X1 is a defined torque rise rate of the engine.
If the difference Δ 1 satisfies the preset condition, the fifth target torque TqEng1(n) is regarded as the fourth target torque TqEng2(n), that is,
TqEng2(n)＝TqEng1(n)＝TqDmd(n)；
if the difference Δ 1 does not satisfy the preset condition, determining a fourth target torque TqEng2(n) according to the fifth target torque TqEng1(n) and X1, wherein,
TqEng2(n)＝TqEng1(n)+X1。
s202, a first target torque of the first electric machine is determined according to the fourth target torque of the engine.
The first target torque of the first motor and the fourth target torque of the engine are such that the target torque of the clutch 1 can be satisfied, and therefore, the first target torque of the first motor can be calculated according to the following formula:
TqMotor1(n)＝TqDmd(n)-TqEng2(n)，
that is, the first target torque of the first electric machine may be 0 after the target torque of the clutch 1 is fully allocated to the engine.
S203, judging whether the output power of the power battery corresponding to the first target torque exceeds the limit, if so, executing S204.
Before the mode switching, the power battery and the first motor supply power to the second motor, so if the target torque of the first motor is changed, the torque required by the operation of the second motor is compensated by the power battery, and if the output power of the power battery is increased when the power battery is limited, the output power of the power battery is easily over-limited, and the service life of the power battery is reduced.
Therefore, before the torque of the first motor is adjusted, whether the adjusted target torque exceeds the output power of the power battery can be judged, so that the torque of the first motor can be adjusted. Of course, if the output power of the power battery is not exceeded, the engine and the first motor may be controlled to operate according to the determined fourth target torque and the first target torque.
S204, acquiring the current torque of the first motor, and determining a second target torque of the first motor according to the current torque and the first target torque.
Specifically, it may be determined whether the difference Δ 2 between the current torque and the first target torque is a preset torque, which may be a limited torque-up rate X2 of the first motor, that is, the preset torque may be associated with a time interval during which the current torque of the first motor is acquired.
Specifically, if the difference Δ 2 satisfies the preset condition, the first target torque TqMotor1(n) is regarded as the second target torque TqMotor2(n), that is,
TqMotor2(n)＝TqMotor1(n)＝TqDmd(n)-TqEng2(n)；
if the difference value delta 2 does not meet the preset condition, determining a second target torque TqMotor2(n) according to the first target torque TqMotor1(n) and X1, wherein,
TqMotor2(n)＝TqMotor1(n)+X2。
and S205, determining a third target torque of the engine according to the second target torque.
Since the second target torque is the adjusted target torque of the first electric machine, the target torque of the engine needs to be re-determined so that the target torque of the first electric machine and the target torque of the engine satisfy the torque demand of the clutch 1, and therefore, the third target torque TqEng3(n) of the engine can be determined by the following equation:
TqEng3(n)＝TqDmd(n)-TqMotor2(n)。
and S206, controlling the engine to work at the third target torque, and controlling the first motor to work at the second target torque.
The first motor is controlled to adjust from the current torque to the second target torque, which may be specifically, the second target torque is sent to the motor management system, so that the motor management system adjusts the first motor from the current torque to the second target torque.
The engine is controlled to operate at the third target torque, which may be specifically, the third target torque is sent to the engine management system, so that the engine management system controls the engine to operate at the third target torque.
After S206, the torques of the first electric machine and the engine are primarily adjusted, and although the power requirement of the whole vehicle is met, the optimal energy distribution is not achieved, and therefore, the torques of the engine and the first electric machine need to be further adjusted, and the adjustment process is as follows:
acquiring a sixth target torque of the motor after a preset time;
if the discharge power of the power battery corresponding to the sixth target torque exceeds the limit, determining a seventh target torque of the motor according to the sixth target torque and the second target torque;
calculating an eighth target torque of the engine according to the seventh target torque;
and controlling the first motor to adjust the second target torque to a seventh target torque, and controlling the engine to work at an eighth target torque.
For further adjusting the torque of the engine and the first motor, reference may be made to the above S201-S206, which are not described herein again.
In the optimized mode adjustment process, since the adjustment rate of the torque of the first motor is limited, the output power of the power battery does not exceed the limit, and fig. 4 is a schematic diagram of the mode adjustment process provided in the embodiment of the present application, in which the rotation speed of the first motor is increased to be the same as the rotation speed of the second motor, the torque of the engine is increased and then decreased, the torque of the first motor is continuously increased to a certain value, and the actual discharge power of the power battery is always below the available discharge power.
In the control method of the hybrid electric vehicle provided by the embodiment of the application, the change of the torque of the first motor is limited, so that the adjustment speed of the torque of the first motor is reduced, the first motor can still supply power to the second motor in the adjustment process, the output power of the power battery is not over-limited, and the service life of the power battery is prolonged.
Based on the above control method of the hybrid electric vehicle, an embodiment of the present application further provides a control device of the hybrid electric vehicle, and referring to fig. 5, a structural block diagram of the control device of the hybrid electric vehicle provided in the embodiment of the present application is shown, where the hybrid electric vehicle is powered by a second motor, and the second motor is powered by a power battery and the first motor, and the control device may include:
a first torque determination unit 110, configured to obtain a current torque and a first target torque of the first motor according to a mode switching instruction, where the mode switching instruction is used to switch from a first mode in which the second motor provides power to a second mode in which the first motor, the second motor, and the engine cooperatively provide power;
a second torque determining unit 120, configured to determine a second target torque of the first motor according to the first target torque and the current torque if the discharge power of the power battery corresponding to the first target torque exceeds a limit;
a torque calculation unit 130 for calculating a third target torque of the engine based on the second target torque;
and a first control unit 140, configured to control the first motor to adjust the current torque to a second target torque, and control the engine to operate at a third target torque.
Optionally, the second torque determination unit includes:
the judging unit is used for judging whether the difference value between the first target torque and the current torque is larger than a preset torque or not if the discharging power of the power battery corresponding to the first target torque exceeds the limit, and activating a third torque determining unit if the difference value is larger than the preset torque;
the third torque determination unit is configured to use a sum of the current torque and the preset torque as a second target torque.
Optionally, the determining unit is further configured to activate a fourth torque determining unit if a difference between the first target torque and the current torque is less than or equal to a preset torque;
the fourth torque determination unit is configured to take the current torque as a second target torque.
Alternatively, the first target torque of the motor is determined based on a fourth target torque of the engine.
Optionally, after the adjusting the motor, the second target torque is used as the current torque of the motor, and then the apparatus further includes:
the torque acquisition unit is used for acquiring a sixth target torque of the motor after preset time;
a fifth torque determination unit, configured to determine a seventh target torque of the motor according to the sixth target torque and the second target torque if a discharge power of a power battery corresponding to the sixth target torque exceeds a limit;
a sixth torque determination unit configured to calculate an eighth target torque of the engine based on the seventh target torque;
and the second control unit is used for controlling the first motor to adjust the second target torque to a seventh target torque and controlling the engine to work at an eighth target torque.
The embodiment of the application provides a control device of a hybrid electric vehicle, the hybrid electric vehicle provides power through a second motor, the second motor is powered through a power battery and a first motor, the current torque and a first target torque of the first motor can be obtained according to a mode switching instruction, the mode switching instruction is used for providing a first mode of the power from the second motor, the first mode is switched to a second mode of the power cooperatively provided by the first motor, the second motor and an engine, if the discharge power of the power battery corresponding to the first target torque exceeds a limit, a second target torque of the first motor can be determined according to a preset torque and the current torque, a third target torque of the engine is calculated according to the second target torque, the first motor is controlled to be adjusted to the second target torque from the current torque, and the engine is controlled to work at the third target torque. In the process, the torque change of the first motor is limited, so that the adjustment speed of the torque of the first motor is reduced, the first motor can still supply power to the second motor in the adjustment process, the output power of the power battery cannot exceed the limit, and the service life of the power battery is prolonged.
The name "first" in the names "first … …", "first … …", etc. mentioned in the embodiments of the present application is only used for name identification, and does not represent the first in sequence. The same applies to "second" etc.
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a general hardware platform. Based on such understanding, the technical solution of the present application may be embodied in the form of a software product, which may be stored in a storage medium, such as a read-only memory (ROM)/RAM, a magnetic disk, an optical disk, or the like, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a router) to execute the method according to the embodiments or some parts of the embodiments of the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the method embodiments and apparatus embodiments are substantially similar to the system embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the system embodiments for related points. The above-described embodiments of the apparatus and system are merely illustrative, wherein modules described as separate parts may or may not be physically separate, and parts shown as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only a preferred embodiment of the present application and is not intended to limit the scope of the present application. It should be noted that, for a person skilled in the art, several improvements and modifications can be made without departing from the scope of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (10)
1. A control method of a hybrid vehicle, the hybrid vehicle being powered by a second electric machine, the second electric machine being powered by a power battery and the first electric machine, the method comprising:
acquiring a current torque and a first target torque of a first motor according to a mode switching instruction, wherein the mode switching instruction is used for switching from a first mode in which a second motor supplies power to a second mode in which the first motor, the second motor and an engine cooperatively supply power;
if the discharge power of the power battery corresponding to the first target torque exceeds the limit, determining a second target torque of the first motor according to the first target torque and the current torque;
calculating a third target torque of the engine according to the second target torque;
and controlling the first motor to adjust the current torque to a second target torque, and controlling the engine to work at a third target torque.
2. The method of claim 1, wherein determining a second target torque for the second electric machine based on the first target torque and the current torque comprises:
judging whether the difference value of the first target torque and the current torque is larger than a preset torque or not;
and if so, taking the sum of the current torque and the preset torque as a second target torque.
3. The method of claim 1, wherein said determining a second target torque for the second electric machine based on a preset torque value and the current torque comprises:
judging whether the difference value of the first target torque and the current torque is larger than a preset torque or not;
and if not, taking the current torque as a second target torque.
4. A method according to any one of claims 1-3, in which the first target torque of the electric machine is determined on the basis of a fourth target torque of the engine.
5. The method according to any one of claims 1-3, wherein after said adjusting the electric machine, the second target torque is taken as a current torque of the electric machine, the method further comprising:
acquiring a sixth target torque of the motor after a preset time;
if the discharge power of the power battery corresponding to the sixth target torque exceeds the limit, determining a seventh target torque of the motor according to the sixth target torque and the second target torque;
calculating an eighth target torque of the engine according to the seventh target torque;
and controlling the first motor to adjust the second target torque to a seventh target torque, and controlling the engine to work at an eighth target torque.
6. A control device for a hybrid electric vehicle, the hybrid electric vehicle being powered by a second electric machine, the second electric machine being powered by a power battery and the first electric machine, the device comprising:
the device comprises a first torque determination unit, a second torque determination unit and a control unit, wherein the first torque determination unit is used for acquiring the current torque and a first target torque of a first motor according to a mode switching instruction, and the mode switching instruction is used for switching from a first mode in which a second motor provides power to a second mode in which the first motor, the second motor and an engine cooperatively provide power;
a second torque determining unit, configured to determine a second target torque of the first motor according to the first target torque and the current torque if a discharge power of the power battery corresponding to the first target torque exceeds a limit;
a torque calculation unit for calculating a third target torque of the engine according to the second target torque;
and the first control unit is used for controlling the first motor to adjust the current torque to a second target torque and controlling the engine to work at a third target torque.
7. The apparatus of claim 6, wherein the second torque determination unit comprises:
the judging unit is used for judging whether the difference value between the first target torque and the current torque is larger than a preset torque or not if the discharging power of the power battery corresponding to the first target torque exceeds the limit, and activating a third torque determining unit if the difference value is larger than the preset torque;
the third torque determination unit is configured to use a sum of the current torque and the preset torque as a second target torque.
8. The device according to claim 6, wherein the determining unit is further configured to activate a fourth torque determining unit if a difference between the first target torque and the current torque is less than or equal to a preset torque;
the fourth torque determination unit is configured to take the current torque as a second target torque.
9. The apparatus of any one of claims 6-8, wherein the first target torque of the electric machine is determined based on a fourth target torque of the engine.
10. The apparatus according to any one of claims 6-8, wherein after the adjusting the motor, the second target torque is used as the current torque of the motor, and the apparatus further comprises:
the torque acquisition unit is used for acquiring a sixth target torque of the motor after preset time;
a fifth torque determination unit, configured to determine a seventh target torque of the motor according to the sixth target torque and the second target torque if a discharge power of a power battery corresponding to the sixth target torque exceeds a limit;
a sixth torque determination unit configured to calculate an eighth target torque of the engine based on the seventh target torque;
and the second control unit is used for controlling the first motor to adjust the second target torque to a seventh target torque and controlling the engine to work at an eighth target torque.
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