CN113734144A - Mode control method, device and system of power system of vehicle and vehicle - Google Patents

Mode control method, device and system of power system of vehicle and vehicle Download PDF

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Publication number
CN113734144A
CN113734144A CN202110999823.XA CN202110999823A CN113734144A CN 113734144 A CN113734144 A CN 113734144A CN 202110999823 A CN202110999823 A CN 202110999823A CN 113734144 A CN113734144 A CN 113734144A
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China
Prior art keywords
driving motor
auxiliary driving
vehicle
controlling
battery pack
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CN202110999823.XA
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Chinese (zh)
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CN113734144B (en
Inventor
徐琪
贾旭
于吉超
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China Express Jiangsu Technology Co Ltd
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China Express Jiangsu Technology Co Ltd
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/08—Electric propulsion units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/24—Energy storage means
    • B60W2510/242—Energy storage means for electrical energy
    • 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
    • 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
    • B60W2710/083—Torque
    • 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

Abstract

The invention discloses a mode control method, a mode control device, a mode control system and a vehicle of a power system of the vehicle. The power system comprises a power battery pack and an auxiliary driving motor, wherein the power battery pack is connected with a direct current bus of the auxiliary driving motor through a switch circuit; the method comprises the following steps: when the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current vehicle speed of the vehicle is greater than or equal to a preset vehicle speed threshold value, if the direct-current bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, controlling the output torque of the auxiliary driving motor to be zero; and controlling the switch circuit to be switched off, thereby controlling the auxiliary driving motor to enter a follow current mode. By adopting the embodiment of the invention, the energy consumption of the vehicle in a high-speed running state can be effectively reduced, and the driving range of the vehicle is effectively increased.

Description

Mode control method, device and system of power system of vehicle and vehicle
Technical Field
The invention relates to the technical field of vehicle control, in particular to a mode control method, equipment and system of a power system of a vehicle and the vehicle.
Background
The conventional hybrid power automobile mostly selects a serial hybrid power driving structure, an auxiliary driving motor is coaxial with an engine, the auxiliary driving motor can provide a torque mode for starting and preventing the engine from stalling and a torque mode for accelerating and climbing, and the auxiliary driving motor and the engine form a torque mode for driving the automobile to run, so that the engine can be prevented from stalling when starting, and additional power can be provided when the automobile accelerates and climbs, thereby improving the fuel economy of the whole automobile and reducing emission.
The current high-voltage topological structure is that the output of a battery pack is directly output to an auxiliary driving motor after passing through a high-voltage distribution box. When the torque output of the auxiliary driving motor is not needed, if the vehicle is in a low-speed running state, controlling the auxiliary driving motor to enter a freewheeling (freewheeling) mode; if the vehicle is in a high-speed driving state, the auxiliary driving motor is in a freewheeling mode at a high speed, so that the motor is dragged backwards, voltage exists at a bus capacitor end, the voltage is increased along with the increase of the vehicle speed, and the voltage is possibly higher than the voltage of a battery pack to influence the safety performance of the battery, so that the auxiliary driving motor is generally controlled to enter a Torque (Torque) mode and the output Torque is 0 Nm.
However, in the process of implementing the invention, the inventor finds that the prior art has at least the following problems: when the torque output of the auxiliary driving motor is not needed, even if the auxiliary driving motor is controlled to enter a torque mode and the output torque is 0Nm in a high-speed driving state of the vehicle, the battery power is consumed in the mode, so that the energy consumption of the whole vehicle is increased at a high speed, and the driving range of the vehicle is influenced.
Disclosure of Invention
The invention aims to provide a mode control method, equipment, a system and a vehicle of a power system of the vehicle, which can effectively reduce the energy consumption of the vehicle in a high-speed driving state and effectively improve the driving range of the vehicle.
In order to achieve the above object, an embodiment of the present invention provides a mode control method for a power system of a vehicle, where the power system includes a power battery pack and an auxiliary driving motor, and a dc bus of the power battery pack and the auxiliary driving motor are connected through a switching circuit;
the method comprises the following steps:
when the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current vehicle speed of the vehicle is greater than or equal to a preset vehicle speed threshold value, judging the magnitude relation between the direct-current bus voltage of the auxiliary driving motor and the output voltage of the power battery pack;
if the direct-current bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, controlling the output torque of the auxiliary driving motor to be zero; and controlling the switch circuit to be switched off;
after controlling the switching circuit to be turned off, controlling the auxiliary drive motor to enter a freewheel mode.
As an improvement of the above solution, after the determining a magnitude relationship between a dc bus voltage of the auxiliary drive motor and an output voltage of the power battery pack when the vehicle has no demand for an output torque of the auxiliary drive motor and a current vehicle speed of the vehicle is greater than or equal to a preset vehicle speed threshold, the method further includes:
and if the direct current bus voltage of the auxiliary driving motor is less than the output voltage of the power battery pack, controlling the auxiliary driving motor to enter a follow current mode.
As an improvement of the above, the method further comprises:
and when the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current vehicle speed is less than a preset vehicle speed threshold value, controlling the auxiliary driving motor to enter a follow current mode.
As an improvement of the above, the method further comprises:
when the vehicle has a requirement for the output torque of an auxiliary driving motor and the current vehicle speed is greater than or equal to a preset vehicle speed threshold value, judging the magnitude relation between the direct-current bus voltage of the auxiliary driving motor and the output voltage of the power battery pack;
if the voltage of the direct current bus of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, controlling the auxiliary driving motor to enter an active short-circuit mode so as to enable the voltage of the direct current bus of the auxiliary driving motor to be zero;
controlling the switching circuit to close after controlling the auxiliary drive motor to enter an active short-circuit mode;
controlling the auxiliary drive motor to enter a torque output mode after controlling the switching circuit to close.
As an improvement of the above solution, after the determining a magnitude relationship between a dc bus voltage of the auxiliary drive motor and an output voltage of the power battery pack when the vehicle has a demand for an output torque of the auxiliary drive motor and the current vehicle speed is greater than or equal to a preset vehicle speed threshold, the method further includes:
and if the direct-current bus voltage of the auxiliary driving motor is smaller than the output voltage of the power battery pack, controlling the switch circuit to be closed, and controlling the auxiliary driving motor to enter a torque output mode after controlling the switch circuit to be closed.
As an improvement of the above, the method further comprises:
when the vehicle has a requirement for the output torque of the auxiliary driving motor and the current vehicle speed is smaller than a preset vehicle speed threshold value, the switch circuit is controlled to be closed, and after the switch circuit is controlled to be closed, the auxiliary driving motor is controlled to enter a torque output mode.
As an improvement of the above scheme, the switching circuit comprises a main contactor, a pre-charging contactor and a pre-charging resistor;
the first end of the main contactor is connected with the battery pack, and the second end of the main contactor is connected with a direct current bus of the auxiliary driving motor; the first end of pre-charging contactor with the first end of main contactor is connected, the second end of pre-charging contactor with the first end of pre-charging resistor is connected, the second end of pre-charging resistor with the second end of main contactor is connected.
As an improvement of the above scheme, the controlling the switching circuit to be turned off specifically includes:
controlling the main contactor to be disconnected;
the controlling of the switch circuit is as follows:
controlling the pre-charging contactor to be closed; and after the preset time, controlling the main contactor to be closed and controlling the pre-charging contactor to be disconnected.
The embodiment of the invention also provides a mode control system of the power system of the vehicle, which comprises the power system of the vehicle and a mode control device of the power system;
the power system comprises a power battery pack and an auxiliary driving motor, wherein the power battery pack is connected with a direct current bus of the auxiliary driving motor through a switch circuit;
the mode control device of the power system comprises a first voltage judgment module, an output torque control module, a switch circuit control module and a first mode control module;
the first voltage judging module is used for judging the magnitude relation between the direct-current bus voltage of the auxiliary driving motor and the output voltage of the power battery pack when the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current vehicle speed of the vehicle is greater than or equal to a preset vehicle speed threshold value;
the output torque control module is used for controlling the output torque of the auxiliary driving motor to be zero if the direct current bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack;
the switch circuit control module is used for controlling the switch circuit to be switched off;
and the first mode control module is used for controlling the auxiliary driving motor to enter a freewheeling mode after controlling the switch circuit to be switched off.
As an improvement of the above scheme, the mode control device of the power system further comprises a second voltage judgment module, a second mode control module and a third mode control module;
the second voltage judging module is used for judging the magnitude relation between the direct-current bus voltage of the auxiliary driving motor and the output voltage of the power battery pack when the vehicle has the requirement of the output torque of the auxiliary driving motor and the current vehicle speed is greater than or equal to a preset vehicle speed threshold value;
the second mode control module is used for controlling the auxiliary driving motor to enter an active short-circuit mode if the direct-current bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, so that the direct-current bus voltage of the auxiliary driving motor is reduced to zero;
the switch circuit control module is also used for controlling the switch circuit to be closed after controlling the auxiliary driving motor to enter an active short-circuit mode;
and the third mode control module is used for controlling the auxiliary driving motor to enter a torque output mode after controlling the switch circuit to be closed.
Embodiments of the present invention also provide a mode control device of a power system of a vehicle, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor implements a mode control method of the power system of the vehicle as described in any one of the above when executing the computer program.
The embodiment of the invention also provides a vehicle, which comprises a power system and a mode control device of the power system; the power system comprises a power battery pack and an auxiliary driving motor, wherein the power battery pack is connected with a direct current bus of the auxiliary driving motor through a switch circuit; the mode control apparatus of the power system is a mode control apparatus of the power system of the vehicle described above.
Compared with the prior art, the mode control method, the mode control equipment, the mode control system and the vehicle of the power system of the vehicle disclosed by the embodiment of the invention have the advantages that the switching circuit is additionally arranged in the power system and is used for connecting the power battery pack and the direct current bus of the auxiliary driving motor. When the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current vehicle speed of the vehicle is greater than or equal to a preset vehicle speed threshold value, if the direct-current bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, controlling the output torque of the auxiliary driving motor to be zero; and controlling the switch circuit to be switched off, and then controlling the auxiliary driving motor to enter a follow current mode. By adopting the technical means of the embodiment of the invention, when the vehicle is in a high-speed running state, the auxiliary driving motor is controlled to enter a follow current mode after the direct current bus connection of the auxiliary driving motor is disconnected, so that the condition that the auxiliary driving motor charges the power battery pack due to the fact that the direct current bus voltage of the auxiliary driving motor is greater than the output voltage of the power battery pack can be avoided, the safety performance of the power battery is ensured, and in addition, the auxiliary driving motor does not need to consume the battery power when the vehicle is in the high-speed running state, the energy consumption of the whole vehicle can be effectively reduced, and the driving range of the vehicle is increased.
Drawings
FIG. 1 is a schematic illustration of a powertrain of a vehicle according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method of controlling a mode of a powertrain of a vehicle in accordance with an embodiment of the present invention;
FIG. 3 is a flow chart illustrating a method of mode control of the powertrain of another vehicle in accordance with an embodiment of the present invention;
FIG. 4 is a schematic illustration of a preferred vehicle powertrain configuration in accordance with an embodiment of the present invention;
FIG. 5 is a flow chart of a preferred method of mode control of the powertrain of the vehicle in accordance with an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a mode control system of a powertrain of a vehicle in accordance with an embodiment of the present invention;
FIG. 7 is a schematic configuration diagram of a mode control apparatus of a powertrain of a vehicle in an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a vehicle in the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic diagram of a power system of a vehicle according to an embodiment of the present invention is shown. The power system 10 comprises a power battery pack 11, an auxiliary driving motor 12 and a high-voltage distribution box. The voltage output of the power battery pack 11 is directly output to the auxiliary driving motor 12 after being regulated and controlled by the high-voltage distribution box.
In the embodiment of the invention, the high-voltage distribution box internally comprises a switch circuit 13; the power battery pack 11 and the dc bus of the auxiliary driving motor 12 are connected by the switching circuit 13.
Referring to fig. 2, a flow chart of a mode control method of a powertrain of a vehicle according to an embodiment of the present invention is shown. An embodiment of the present invention provides a mode control method of a powertrain of a vehicle, which is performed through steps S11 to S13:
s11, when the vehicle does not have the requirement of output torque of the auxiliary driving motor and the current vehicle speed of the vehicle is greater than or equal to a preset vehicle speed threshold value, judging the magnitude relation between the direct current bus voltage of the auxiliary driving motor and the output voltage of the power battery pack;
s12, if the direct current bus voltage of the auxiliary driving motor is larger than or equal to the output voltage of the power battery pack, controlling the output torque of the auxiliary driving motor to be zero; and controlling the switch circuit to be switched off;
and S13, after the switch circuit is controlled to be switched off, controlling the auxiliary driving motor to enter a free-wheeling mode.
Specifically, when the vehicle does not have the requirement of the output torque of the auxiliary driving motor, the auxiliary driving motor 12 is controlled to enter a freewheeling (freewheeling) mode, in which case the auxiliary driving motor 12 does not need to consume the battery power, and the energy consumption of the whole vehicle can be effectively reduced.
However, in order to avoid the situation that the auxiliary driving motor 12 is reversely dragged in the vehicle freewheeling mode and in the high-speed running state, so that a voltage exists at a bus capacitor end of the auxiliary driving motor 12, and the voltage increases to be higher than the output voltage of the power battery pack along with the increase of the vehicle speed, which results in the auxiliary driving motor 12 charging the power battery pack 11, in the embodiment of the present invention, when it is found that the vehicle does not have the requirement of the output torque of the auxiliary driving motor, the current vehicle speed of the vehicle is obtained first, and whether the current vehicle speed is greater than or equal to the preset vehicle speed threshold value is determined, so as to determine whether the vehicle is currently in the high-speed running state.
In one embodiment, when it is determined that the vehicle is currently in a high-speed driving state, the magnitude relationship between the dc bus voltage of the auxiliary drive motor 12 and the output voltage of the power battery pack 11 is further determined.
In one case, if the dc bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, if the auxiliary driving motor is directly controlled to enter the freewheeling mode, the auxiliary driving motor 12 will charge the power battery pack 11, so that the output torque of the auxiliary driving motor is unloaded, that is, the output torque is cleared, and the switching circuit 13 is controlled to be switched off, so that the dc bus of the auxiliary driving motor 12 is switched off from the power battery pack 11. Further, after the switching circuit 13 is controlled to be turned off, the auxiliary drive motor 12 is controlled to enter a freewheel mode.
By adopting the embodiment of the invention, the vehicle can still control the auxiliary driving motor to enter the follow current mode in a high-speed running state, the energy consumption of the whole vehicle is effectively reduced, meanwhile, the condition that the direct current bus voltage of the auxiliary driving motor is greater than the output voltage of the power battery pack to charge the power battery pack can be avoided, and the safety performance of the power battery is ensured.
It should be noted that, in the embodiment of the present invention, whether the vehicle has a requirement for the output torque of the auxiliary driving motor may be determined by whether a torque distribution instruction issued by a vehicle control unit of the vehicle is received. For example, when the vehicle is in an engine starting state or in an acceleration and climbing state, the auxiliary driving motor is required to output torque, so as to prevent the engine from stalling during starting or assist in providing a torque for the vehicle to run.
In another case, the method for controlling the mode of the powertrain of the vehicle further includes step S14:
and S14, if the direct current bus voltage of the auxiliary driving motor is smaller than the output voltage of the power battery pack, controlling the auxiliary driving motor to enter a follow current mode.
Specifically, when the vehicle does not have the requirement of the output torque of the auxiliary drive motor, and the vehicle is currently in a high-speed running state, if the voltage of the direct-current bus of the auxiliary drive motor is smaller than the output voltage of the power battery pack, the situation that the auxiliary drive motor 12 charges the power battery pack 11 cannot be caused, and therefore the auxiliary drive motor can be directly controlled to enter a follow current mode so as to reduce the energy consumption of the whole vehicle.
In another embodiment, the method for controlling the mode of the powertrain of the vehicle further includes step S15:
and S15, when the vehicle has no requirement of output torque of the auxiliary driving motor and the current vehicle speed is less than a preset vehicle speed threshold value, controlling the auxiliary driving motor to enter a free-wheeling mode.
Specifically, when the vehicle does not have the requirement of the output torque of the auxiliary driving motor and is in a low-speed running state at present, the auxiliary driving motor is not dragged reversely, so that voltage exists at the end of the bus capacitor, and the condition that the auxiliary driving motor 12 charges the power battery pack 11 does not occur. Under the condition, the auxiliary driving motor can be directly controlled to enter a follow current mode without judging the magnitude relation between the direct current bus voltage of the auxiliary driving motor and the output voltage of the power battery pack, so that the energy consumption of the whole vehicle is reduced.
The embodiment of the invention provides a mode control method of a power system of a vehicle. When the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current vehicle speed of the vehicle is greater than or equal to a preset vehicle speed threshold value, if the direct-current bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, controlling the output torque of the auxiliary driving motor to be zero; and controlling the switch circuit to be switched off, and then controlling the auxiliary driving motor to enter a follow current mode. By adopting the technical means of the embodiment of the invention, when the vehicle is in a high-speed running state, the auxiliary driving motor is controlled to enter the follow current mode after the direct current bus connection of the auxiliary driving motor is disconnected, so that the condition that the auxiliary driving motor charges the power battery pack due to the fact that the direct current bus voltage of the auxiliary driving motor is greater than the output voltage of the power battery pack can be avoided, the safety performance of the power battery is ensured, and the vehicle enters the follow current mode in the high-speed running state, the auxiliary driving motor does not need to consume the power of the battery, the energy consumption of the whole vehicle can be effectively reduced, and the continuous running mileage of the vehicle is improved.
Referring to fig. 3, a flow chart of a mode control method of a power system of another vehicle according to an embodiment of the present invention is shown as a preferred embodiment. The mode control method of the powertrain of the vehicle further includes steps S21 to S24:
s21, when the vehicle has a requirement for output torque of an auxiliary driving motor and the current vehicle speed is greater than or equal to a preset vehicle speed threshold value, judging the magnitude relation between the direct current bus voltage of the auxiliary driving motor and the output voltage of the power battery pack;
s22, if the voltage of the direct current bus of the auxiliary driving motor is larger than or equal to the output voltage of the power battery pack, controlling the auxiliary driving motor to enter an active short-circuit mode so as to enable the voltage of the direct current bus of the auxiliary driving motor to be zero;
s23, controlling the switch circuit to be closed after controlling the auxiliary driving motor to enter the active short-circuit mode;
and S24, controlling the auxiliary driving motor to enter a torque output mode after controlling the switch circuit to be closed.
Specifically, when the vehicle has a demand for the output Torque of the auxiliary driving motor, the auxiliary driving motor 12 needs to be controlled to enter a Torque output (Torque) mode to assist in providing the Torque for the vehicle to run. In this case, since the auxiliary driving motor of the vehicle is switched from the freewheeling mode to the torque output mode, it is necessary to first obtain the current vehicle speed of the vehicle and determine whether the current vehicle speed is greater than or equal to a preset vehicle speed threshold value, so as to determine whether the vehicle is currently in a high-speed driving state.
In one embodiment, when it is determined that the vehicle is currently in a high-speed driving state, the magnitude relationship between the dc bus voltage of the auxiliary drive motor 12 and the output voltage of the power battery pack 11 is further determined.
In one case, if the dc bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, the connection between the dc bus of the auxiliary driving motor and the power battery pack is established if the switch circuit is directly closed, which will cause the auxiliary driving motor 12 to charge the power battery pack 11. Therefore, the auxiliary driving motor is first controlled to enter an Active Short Circuit (ASC) mode, so that the dc bus voltage drop of the auxiliary driving motor 12 is zero. After the voltage drop of the direct current bus of the auxiliary driving motor is zero, the switching circuit can be controlled to be closed, the auxiliary driving motor is further controlled to enter a torque output mode, and the auxiliary driving motor normally outputs torque according to a torque distribution instruction of the vehicle controller.
In another case, the method for controlling the mode of the powertrain of the vehicle further includes step S25:
and S25, if the direct current bus voltage of the auxiliary driving motor is smaller than the output voltage of the power battery pack, controlling the switch circuit to be closed, and controlling the auxiliary driving motor to enter a torque output mode after controlling the switch circuit to be closed.
Specifically, when the vehicle has a requirement for torque output of the auxiliary drive motor and is currently in a high-speed driving state, if the dc bus voltage of the auxiliary drive motor is less than the output voltage of the power battery pack, closing the switch circuit will not cause the auxiliary drive motor 12 to charge the power battery pack 11, so that the switch circuit can be directly controlled to be closed, and the auxiliary drive motor is controlled to enter a torque output mode.
In another embodiment, the method for controlling the mode of the powertrain of the vehicle further includes step S26:
and S26, when the vehicle has a requirement for the output torque of the auxiliary driving motor and the current vehicle speed is less than a preset vehicle speed threshold value, controlling the switch circuit to be closed, and after controlling the switch circuit to be closed, controlling the auxiliary driving motor to enter a torque output mode.
Specifically, when the vehicle has a requirement for the output torque of the auxiliary drive motor and the vehicle is currently in a low-speed running state, the switch circuit is closed, and in the freewheeling mode, the auxiliary drive motor is not dragged backwards, so that voltage is present at the bus capacitor end, and the situation that the auxiliary drive motor 12 charges the power battery pack 11 does not occur. Therefore, the switch circuit can be directly controlled to be closed, and the auxiliary driving motor is controlled to enter a torque output mode.
The embodiment of the invention provides a mode control method of a power system of a vehicle. When the vehicle has a requirement for torque output of the auxiliary driving motor, the auxiliary driving motor needs to be switched from a follow current mode to a torque output mode, if the current vehicle speed of the vehicle is greater than or equal to a preset vehicle speed threshold value and the direct current bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, the auxiliary driving motor is controlled to enter an active short-circuit mode so that the direct current bus voltage of the auxiliary driving motor is reduced to zero, and then the switching circuit is controlled to be switched off, so that the auxiliary driving motor is controlled to enter the torque output mode. By adopting the technical means of the embodiment of the invention, when the vehicle is in a high-speed running state, the auxiliary driving motor can be controlled to enter the follow current mode, the energy consumption of the whole vehicle is effectively reduced, the driving range of the vehicle is improved, and when the follow current mode needs to be converted into the torque output mode, the situation that the auxiliary driving motor charges the power battery pack due to the fact that the direct current bus voltage of the auxiliary driving motor is greater than the output voltage of the power battery pack can be avoided, and the safety performance of the power battery is ensured.
Referring to fig. 4, a schematic diagram of a power system of a preferred vehicle according to an embodiment of the present invention is shown. On the basis of the above embodiment, the switching circuit 13 includes the main contactor 131, the precharge contactor 132, and the precharge resistor 133.
A first end of the main contactor 131 is connected with the battery pack, and a second end of the main contactor 131 is connected with a direct current bus of the auxiliary driving motor; the first end of the pre-charging contactor 132 is connected to the first end of the main contactor 131, the second end of the pre-charging contactor 132 is connected to the first end of the pre-charging resistor 133, and the second end of the pre-charging resistor 133 is connected to the second end of the main contactor 131.
Then, in step S12, the controlling the switch circuit to be turned off specifically includes: and controlling the main contactor to be disconnected.
In step S23, the controlling of the switch circuit to be closed specifically includes: controlling the pre-charging contactor to be closed; and after the preset time, controlling the main contactor to be closed and controlling the pre-charging contactor to be disconnected.
In the embodiment of the present invention, the main contactor 131 is used for realizing the connection and disconnection between the power battery pack and the dc bus of the auxiliary driving motor. The pre-charging contactor 132 and the pre-charging resistor 133 are connected in series to form a pre-charging branch for protecting the main contactor.
In the operation of closing the switching circuit, the pre-charging contactor is closed firstly, and after the pre-charging is finished, the pre-charging contactor is disconnected and the main contactor is closed, so that the condition that the main contactor is damaged due to overlarge instantaneous current at the moment of directly electrifying the main contactor can be prevented. The pre-charging resistor plays a role in limiting current.
In the operation of opening the switching circuit, the main contactor is essentially controlled to be opened, because normally, the pre-charging contactor should be in an opened state.
Referring to fig. 5, a flow chart of a mode control method of a preferred vehicle powertrain system in an embodiment of the present invention is shown. In the embodiment of the invention, whether the vehicle has the requirement of the output torque of the auxiliary driving motor is judged. And if the vehicle has the requirement of the output torque of the auxiliary driving motor, further acquiring the current vehicle speed of the vehicle.
In the first embodiment, if the vehicle is in a high-speed driving state, the magnitude relationship between the dc bus voltage of the auxiliary driving motor and the output voltage of the power battery pack is further determined.
In a case of the first embodiment, the dc bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, and then the auxiliary driving motor is controlled to enter an active short-circuit mode, so that the dc bus voltage of the auxiliary driving motor is reduced to zero, and then, if the main contactor is in an off state, the pre-charging contactor is engaged, the pre-charging contactor is disengaged after the pre-charging is completed, and the main contactor is engaged, and finally, the auxiliary driving motor is controlled to enter a torque output mode.
In another case of the first embodiment, the dc bus voltage of the auxiliary driving motor is less than the output voltage of the power battery pack, and if the main contactor is in an off state, the pre-charging contactor is engaged, the pre-charging contactor is disengaged after the pre-charging is completed, the main contactor is engaged, and the auxiliary driving motor is controlled to enter a torque output mode.
In a second embodiment, if the vehicle is in a low-speed running state, if the main contactor is in an off state, the pre-charging contactor is engaged, the pre-charging contactor is disengaged after the pre-charging is completed, the main contactor is engaged, and the auxiliary driving motor is controlled to enter a torque output mode.
And if the vehicle does not have the requirement of the output torque of the auxiliary driving motor, further acquiring the current vehicle speed of the vehicle. In a third embodiment, if the vehicle is in a high-speed driving state, the magnitude relationship between the dc bus voltage of the auxiliary driving motor and the output voltage of the power battery pack is further determined.
In one case of the third embodiment, if the dc bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, the output torque of the auxiliary driving motor is unloaded; and controlling the main contactor to be switched off. And finally, controlling the auxiliary driving motor to enter a follow current mode.
In another case of the third embodiment, if the dc bus voltage of the auxiliary driving motor is less than the output voltage of the power battery pack, the auxiliary driving motor is directly controlled to enter the torque output mode.
In a fourth embodiment, the auxiliary drive motor is directly controlled to enter a torque output mode if the vehicle is in a low speed running state.
Referring to fig. 6, a schematic diagram of a mode control system of a powertrain of a vehicle according to an embodiment of the present invention is shown. The embodiment of the invention provides a mode control system 40 of a power system of a vehicle, which comprises a power system 41 of the vehicle and a mode control device 42 of the power system.
The power system 41 comprises a power battery pack and an auxiliary driving motor, wherein the power battery pack is connected with a direct current bus of the auxiliary driving motor through a switch circuit.
The mode control device 42 of the power system includes a first voltage determination module, an output torque control module, a switch circuit control module, and a first mode control module. Wherein the content of the first and second substances,
the first voltage judging module is used for judging the magnitude relation between the direct-current bus voltage of the auxiliary driving motor and the output voltage of the power battery pack when the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current vehicle speed of the vehicle is greater than or equal to a preset vehicle speed threshold value;
the output torque control module is used for controlling the output torque of the auxiliary driving motor to be zero if the direct current bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack;
the switch circuit control module is used for controlling the switch circuit to be switched off;
and the first mode control module is used for controlling the auxiliary driving motor to enter a freewheeling mode after controlling the switch circuit to be switched off.
By adopting the technical means of the embodiment of the invention, when the vehicle is in a high-speed running state, the auxiliary driving motor is controlled to enter the follow current mode after the direct current bus connection of the auxiliary driving motor is disconnected, so that the condition that the auxiliary driving motor charges the power battery pack due to the fact that the direct current bus voltage of the auxiliary driving motor is greater than the output voltage of the power battery pack can be avoided, the safety performance of the power battery is ensured, and the vehicle enters the follow current mode in the high-speed running state, the auxiliary driving motor does not need to consume the power of the battery, the energy consumption of the whole vehicle can be effectively reduced, and the continuous running mileage of the vehicle is improved.
In a preferred embodiment, the mode control device 42 of the power system further comprises a second voltage judgment module, a second mode control module and a third mode control module;
the second voltage judging module is used for judging the magnitude relation between the direct-current bus voltage of the auxiliary driving motor and the output voltage of the power battery pack when the vehicle has the requirement of the output torque of the auxiliary driving motor and the current vehicle speed is greater than or equal to a preset vehicle speed threshold value;
the second mode control module is used for controlling the auxiliary driving motor to enter an active short-circuit mode if the direct-current bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, so that the direct-current bus voltage of the auxiliary driving motor is reduced to zero;
the switch circuit control module is also used for controlling the switch circuit to be closed after controlling the auxiliary driving motor to enter an active short-circuit mode;
and the third mode control module is used for controlling the auxiliary driving motor to enter a torque output mode after controlling the switch circuit to be closed.
By adopting the technical means of the embodiment of the invention, when the vehicle is in a high-speed running state, the auxiliary driving motor can be controlled to enter the follow current mode, the energy consumption of the whole vehicle is effectively reduced, the driving range of the vehicle is improved, and when the follow current mode needs to be converted into the torque output mode, the situation that the auxiliary driving motor charges the power battery pack due to the fact that the direct current bus voltage of the auxiliary driving motor is greater than the output voltage of the power battery pack can be avoided, and the safety performance of the power battery is ensured.
Referring to fig. 7, a schematic diagram of a mode control apparatus of a powertrain of a vehicle in an embodiment of the present invention is shown. An embodiment of the present invention provides a mode control apparatus 50 of a power system of a vehicle, including a processor 51, a memory 52, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing a mode control method of the power system of the vehicle as described in the above embodiment when executing the computer program.
It should be noted that the mode control device for a vehicle powertrain according to the embodiment of the present invention is configured to execute all the process steps of the mode control method for a vehicle powertrain according to the embodiment, and the working principles and beneficial effects of the two are in one-to-one correspondence, so that details are not repeated.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or the like.
Fig. 8 is a schematic structural diagram of a vehicle according to an embodiment of the present invention. An embodiment of the present invention provides a vehicle 60 including a powertrain 61 and a mode control apparatus 62 of the powertrain. The power system 61 comprises a power battery pack and an auxiliary driving motor, wherein the direct current bus of the power battery pack and the direct current bus of the auxiliary driving motor are connected through a switch circuit; the powertrain mode control apparatus 62 is the powertrain mode control apparatus of the vehicle described in the above embodiment.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (12)

1. The mode control method of the power system of the vehicle is characterized in that the power system comprises a power battery pack and an auxiliary driving motor, and a direct current bus of the power battery pack and a direct current bus of the auxiliary driving motor are connected through a switch circuit;
the method comprises the following steps:
when the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current vehicle speed of the vehicle is greater than or equal to a preset vehicle speed threshold value, judging the magnitude relation between the direct-current bus voltage of the auxiliary driving motor and the output voltage of the power battery pack;
if the direct-current bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, controlling the output torque of the auxiliary driving motor to be zero; and controlling the switch circuit to be switched off;
after controlling the switching circuit to be turned off, controlling the auxiliary drive motor to enter a freewheel mode.
2. The mode control method of a powertrain system of a vehicle according to claim 1, wherein after determining a magnitude relationship between a dc bus voltage of an auxiliary drive motor and an output voltage of the power battery pack when there is no demand for an output torque of the auxiliary drive motor for the vehicle and a current vehicle speed of the vehicle is equal to or greater than a preset vehicle speed threshold, the method further comprises:
and if the direct current bus voltage of the auxiliary driving motor is less than the output voltage of the power battery pack, controlling the auxiliary driving motor to enter a follow current mode.
3. The method of mode control of a powertrain system of a vehicle of claim 1, further comprising:
and when the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current vehicle speed is less than a preset vehicle speed threshold value, controlling the auxiliary driving motor to enter a follow current mode.
4. The method of mode control of a powertrain system of a vehicle of claim 1, further comprising:
when the vehicle has a requirement for the output torque of an auxiliary driving motor and the current vehicle speed is greater than or equal to a preset vehicle speed threshold value, judging the magnitude relation between the direct-current bus voltage of the auxiliary driving motor and the output voltage of the power battery pack;
if the voltage of the direct current bus of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, controlling the auxiliary driving motor to enter an active short-circuit mode so as to enable the voltage of the direct current bus of the auxiliary driving motor to be zero;
controlling the switching circuit to close after controlling the auxiliary drive motor to enter an active short-circuit mode;
controlling the auxiliary drive motor to enter a torque output mode after controlling the switching circuit to close.
5. The mode control method of the power system of the vehicle according to claim 4, characterized in that after determining the magnitude relation between the dc bus voltage of the auxiliary drive motor and the output voltage of the power battery pack when the vehicle has a demand for the output torque of the auxiliary drive motor and the current vehicle speed is greater than or equal to a preset vehicle speed threshold, the method further comprises:
and if the direct-current bus voltage of the auxiliary driving motor is smaller than the output voltage of the power battery pack, controlling the switch circuit to be closed, and controlling the auxiliary driving motor to enter a torque output mode after controlling the switch circuit to be closed.
6. The method of mode control of a powertrain system of a vehicle of claim 1, further comprising:
when the vehicle has a requirement for the output torque of the auxiliary driving motor and the current vehicle speed is smaller than a preset vehicle speed threshold value, the switch circuit is controlled to be closed, and after the switch circuit is controlled to be closed, the auxiliary driving motor is controlled to enter a torque output mode.
7. The mode control method of a powertrain of a vehicle according to claim 4, characterized in that the switching circuit includes a main contactor, a pre-charge contactor, and a pre-charge resistor;
the first end of the main contactor is connected with the battery pack, and the second end of the main contactor is connected with a direct current bus of the auxiliary driving motor; the first end of pre-charging contactor with the first end of main contactor is connected, the second end of pre-charging contactor with the first end of pre-charging resistor is connected, the second end of pre-charging resistor with the second end of main contactor is connected.
8. The mode control method of a powertrain system of a vehicle according to claim 7, characterized in that the controlling of the switching circuit to be open is:
controlling the main contactor to be disconnected;
the controlling of the switch circuit is as follows:
controlling the pre-charging contactor to be closed; and after the preset time, controlling the main contactor to be closed and controlling the pre-charging contactor to be disconnected.
9. A mode control system of a powertrain system of a vehicle, characterized by comprising a powertrain system of a vehicle and a mode control device of the powertrain system;
the power system comprises a power battery pack and an auxiliary driving motor, wherein the power battery pack is connected with a direct current bus of the auxiliary driving motor through a switch circuit;
the mode control device of the power system comprises a first voltage judgment module, an output torque control module, a switch circuit control module and a first mode control module;
the first voltage judging module is used for judging the magnitude relation between the direct-current bus voltage of the auxiliary driving motor and the output voltage of the power battery pack when the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current vehicle speed of the vehicle is greater than or equal to a preset vehicle speed threshold value;
the output torque control module is used for controlling the output torque of the auxiliary driving motor to be zero if the direct current bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack;
the switch circuit control module is used for controlling the switch circuit to be switched off;
and the first mode control module is used for controlling the auxiliary driving motor to enter a freewheeling mode after controlling the switch circuit to be switched off.
10. The mode control system of a powertrain of a vehicle of claim 9, characterized in that the mode control apparatus of the powertrain further comprises a second voltage determination module, a second mode control module and a third mode control module;
the second voltage judging module is used for judging the magnitude relation between the direct-current bus voltage of the auxiliary driving motor and the output voltage of the power battery pack when the vehicle has the requirement of the output torque of the auxiliary driving motor and the current vehicle speed is greater than or equal to a preset vehicle speed threshold value;
the second mode control module is used for controlling the auxiliary driving motor to enter an active short-circuit mode if the direct-current bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, so that the direct-current bus voltage of the auxiliary driving motor is reduced to zero;
the switch circuit control module is also used for controlling the switch circuit to be closed after controlling the auxiliary driving motor to enter an active short-circuit mode;
and the third mode control module is used for controlling the auxiliary driving motor to enter a torque output mode after controlling the switch circuit to be closed.
11. A mode control apparatus of a powertrain of a vehicle, characterized by comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing a mode control method of the powertrain of the vehicle according to any one of claims 1 to 8 when executing the computer program.
12. A vehicle comprising a powertrain system and a mode control arrangement for the powertrain system; the power system comprises a power battery pack and an auxiliary driving motor, wherein the power battery pack is connected with a direct current bus of the auxiliary driving motor through a switch circuit; the mode control apparatus of a powertrain system is the mode control apparatus of a powertrain system of a vehicle according to claim 11.
CN202110999823.XA 2021-08-26 2021-08-26 Mode control method, device and system for power system of vehicle and vehicle Active CN113734144B (en)

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