CN113734144B - Mode control method, device and system for power system of vehicle and vehicle - Google Patents

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

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Publication number
CN113734144B
CN113734144B CN202110999823.XA CN202110999823A CN113734144B CN 113734144 B CN113734144 B CN 113734144B CN 202110999823 A CN202110999823 A CN 202110999823A CN 113734144 B CN113734144 B CN 113734144B
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driving motor
auxiliary driving
vehicle
battery pack
mode
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CN113734144A (en
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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, equipment and system of a power system of a vehicle and the vehicle. The power system comprises a power battery pack and an auxiliary driving motor, and 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 speed of the vehicle is greater than or equal to a preset speed threshold, 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 output torque of the auxiliary driving motor to be zero; and the switch circuit is controlled to be disconnected, so that the auxiliary driving motor is controlled 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 can be effectively improved.

Description

Mode control method, device and system for power system of vehicle and vehicle
Technical Field
The present invention relates to the field of vehicle control technologies, and in particular, to a mode control method, device, system and vehicle for a power system of a vehicle.
Background
The existing hybrid electric vehicle mostly selects a series hybrid power driving structure, an auxiliary driving motor and an engine are coaxial, the auxiliary driving motor can provide a torque mode for starting and preventing the engine from flameout and a torque mode for accelerating and climbing, the auxiliary driving motor and the engine are combined to drive the vehicle to run, the engine can be prevented from flameout when starting, and additional power can be provided when the vehicle accelerates and climbs, so that the fuel economy of the whole vehicle is improved, and the emission is reduced.
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 freewheel (freewheel) 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 reversely towed, a voltage exists at the bus capacitor end, the voltage increases along with the increase of the vehicle speed, and a condition higher than the battery pack voltage possibly exists, so that the safety performance of the battery is influenced, and therefore, the auxiliary driving motor is usually controlled to enter a Torque (Torque) mode and output Torque is 0Nm.
However, in practicing the present invention, the inventors found that the prior art has at least the following problems: when the torque output of the auxiliary driving motor is not needed, if the vehicle is in a high-speed driving state, even if the auxiliary driving motor is controlled to enter a torque mode and the output torque is 0Nm, battery power is needed to be 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 embodiment of the invention aims to provide a mode control method, equipment and system of a power system of a vehicle and the vehicle, which can effectively reduce energy consumption of the vehicle in a high-speed running 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 of a power system of a vehicle, the power system including a power battery pack and an auxiliary driving motor, the power battery pack and a dc bus of the auxiliary driving motor being 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 speed of the vehicle is greater than or equal to a preset speed threshold, judging the magnitude relation between the DC bus voltage of the auxiliary driving motor and the output voltage of the power battery pack;
if the DC 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 switching circuit to be disconnected;
and after the switching circuit is controlled to be opened, controlling the auxiliary driving motor to enter a follow current mode.
As an improvement of the above solution, after determining a magnitude relation between the dc bus voltage of the auxiliary driving motor and the output voltage of the power battery pack when the vehicle does not have a requirement for the output torque of the auxiliary driving motor and the current speed of the vehicle is greater than or equal to a preset 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 auxiliary driving motor to enter a follow current mode.
As an improvement of the above solution, the method further includes:
and when the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current vehicle speed is smaller than a preset vehicle speed threshold value, controlling the auxiliary driving motor to enter a follow current mode.
As an improvement of the above solution, the method further includes:
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, 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;
after the auxiliary driving motor is controlled to enter an active short-circuit mode, the switching circuit is controlled to be closed;
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 solution, after determining a magnitude relation between a dc bus voltage of the auxiliary driving motor and an output voltage of the power battery pack when the vehicle has a requirement for an output torque of the auxiliary driving 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 solution, the method further includes:
when the vehicle has a requirement for outputting torque by the auxiliary driving motor and the current vehicle speed is smaller than a preset vehicle speed threshold value, the switching circuit is controlled to be closed, and after the switching circuit is controlled to be closed, the auxiliary driving motor is controlled to enter a torque output mode.
As an improvement of the above-mentioned scheme, the switching circuit includes a main contactor, a precharge contactor, and a precharge 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 the direct current bus of the auxiliary driving motor; the first end of the pre-charging contactor is connected with the first end of the main contactor, the second end of the pre-charging contactor is connected with the first end of the pre-charging resistor, and the second end of the pre-charging resistor is connected with the second end of the main contactor.
As an improvement of the above scheme, the control of the switch circuit to be turned off specifically includes:
controlling the main contactor to be opened;
the control of the switch circuit to be closed is specifically as follows:
controlling the prefill contactor to be closed; and after a preset time period passes, controlling the main contactor to be closed, and controlling the pre-charging contactor to be opened.
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, and 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 judging module, an output torque control module, a switching 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 for the output torque of the auxiliary driving motor and the current speed of the vehicle is greater than or equal to a preset 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 DC 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 disconnected;
the first mode control module is used for controlling the auxiliary driving motor to enter a follow current mode after the switch circuit is controlled to be disconnected.
As an improvement of the above scheme, the mode control device of the power system further comprises a second voltage judging 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 for 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 configured to control the auxiliary driving motor to enter an active short circuit mode if the dc bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, so that the dc 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;
the third mode control module is used for controlling the auxiliary driving motor to enter a torque output mode after the switch circuit is controlled to be closed.
The embodiment of the invention also provides a mode control device of the power system of the vehicle, which comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the mode control method of the power system of the vehicle is realized when the processor executes the computer program.
The embodiment of the invention also provides a vehicle, which comprises a power system and mode control equipment 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 is the mode control device of the power system of the vehicle.
Compared with the prior art, the mode control method, equipment and system for the power system of the vehicle and the vehicle are disclosed by the embodiment of the invention, and a switch circuit is additionally arranged in the power system and is used for connecting a power battery pack and a direct current bus of an auxiliary driving motor. When the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current speed of the vehicle is greater than or equal to a preset speed threshold, 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 output torque of the auxiliary driving motor to be zero; and controlling the switch circuit to be disconnected, and 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 of the auxiliary driving motor is disconnected, so that 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 larger than the output voltage of the power battery pack can be avoided, the safety performance of the power battery is ensured, and the auxiliary driving motor does not need to consume 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 mileage of the vehicle is improved.
Drawings
FIG. 1 is a schematic illustration of a powertrain of a vehicle in accordance with an embodiment of the present invention;
FIG. 2 is a flow chart of a method for controlling a mode of a powertrain of a vehicle in accordance with an embodiment of the present invention;
FIG. 3 is a flow chart of another method for controlling a mode of a powertrain of a vehicle according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of a preferred vehicle powertrain in an embodiment of the present invention;
FIG. 5 is a flow chart of a preferred method of mode control of a powertrain of a vehicle in accordance with an embodiment of the present invention;
FIG. 6 is a schematic 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 structural view of a mode control apparatus of a power system of a vehicle in an embodiment of the present invention;
fig. 8 is a schematic view of a vehicle according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a schematic structure 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 comprises a switch circuit 13; the power battery pack 11 and the direct current bus of the auxiliary driving motor 12 are connected through the switch circuit 13.
Referring to fig. 2, a flow chart of a mode control method of a power system of a vehicle according to an embodiment of the present invention is shown. The embodiment of the invention provides a mode control method of a power system of a vehicle, which is implemented through steps S11 to S13:
s11, judging the magnitude relation between the DC 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 speed of the vehicle is greater than or equal to a preset speed threshold;
s12, 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 output torque of the auxiliary driving motor to be zero; and controlling the switching circuit to be disconnected;
and S13, after the switch circuit is controlled to be disconnected, controlling the auxiliary driving motor to enter a follow current mode.
Specifically, when the vehicle does not have a requirement for the output torque of the auxiliary driving motor, the auxiliary driving motor 12 is controlled to enter a freewheel (freewheel) mode, and in this case, the auxiliary driving motor 12 does not need to consume battery power, so that the energy consumption of the whole vehicle can be effectively reduced.
However, in order to avoid the situation that the vehicle is in a freewheeling mode and is running at a high speed, the auxiliary driving motor 12 is reversely towed, so that a voltage exists at the 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, so that the auxiliary driving motor 12 charges the power battery pack 11.
In one embodiment, when it is determined that the vehicle is currently running at a high speed, the magnitude relation between the dc bus voltage of the auxiliary drive motor 12 and the output voltage of the power battery pack 11 is further determined.
Under the condition that the voltage of the dc bus 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 follow current mode, the auxiliary driving motor 12 charges the power battery pack 11, so that the output torque of the auxiliary driving motor is unloaded, namely, the output torque is cleared, and the switch circuit 13 is controlled to be disconnected, so that the dc bus of the auxiliary driving motor 12 is disconnected from the power battery pack 11. Further, after the switching circuit 13 is controlled to be turned off, the auxiliary drive motor 12 can be 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 under the high-speed driving state, so that the energy consumption of the whole vehicle is effectively reduced, and meanwhile, the condition that the power battery pack is charged due to the fact that the direct current bus voltage of the auxiliary driving motor is larger than the output voltage of 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 outputting torque by the auxiliary driving motor may be determined by whether a torque distribution command issued by the vehicle controller of the vehicle is received. For example, when the vehicle is in an engine starting state or in an accelerating and climbing state, the auxiliary driving motor is required to output torque, so as to prevent the engine from flameout or assist in providing the torque for driving the vehicle during starting, at this time, the vehicle controller determines that the vehicle has a requirement for the output torque of the auxiliary driving motor, and issues a torque distribution command to distribute the output torque of the auxiliary driving motor.
In another case, the mode control method of the power system 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 a requirement for the output torque of the auxiliary driving motor and the vehicle is currently in a high-speed driving state, if the dc bus voltage of the auxiliary driving motor is smaller than the output voltage of the power battery pack, the auxiliary driving motor 12 is not caused to charge the power battery pack 11 at this time, so that the auxiliary driving motor can be directly controlled to enter into the freewheel mode, so as to reduce the energy consumption of the whole vehicle.
In another embodiment, the mode control method of the power system of the vehicle further includes step S15:
and S15, when the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current vehicle speed is smaller than a preset vehicle speed threshold, controlling the auxiliary driving motor to enter a follow current mode.
Specifically, when the vehicle does not have a requirement for the output torque of the auxiliary driving motor, and the vehicle is currently in a low-speed running state, the auxiliary driving motor is not reversely towed to cause the voltage at the bus capacitor end, and the condition that the auxiliary driving motor 12 charges the power battery pack 11 is not generated. Under the condition, the auxiliary driving motor can be directly controlled to enter the follow current mode without judging the 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, wherein a switch circuit is additionally arranged in the power system and is used for connecting a power battery pack and a direct current bus of an auxiliary driving motor. When the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current speed of the vehicle is greater than or equal to a preset speed threshold, 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 output torque of the auxiliary driving motor to be zero; and controlling the switch circuit to be disconnected, and 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 of the auxiliary driving motor is disconnected, so that 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 larger 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 battery power, the energy consumption of the whole vehicle can be effectively reduced, and the driving mileage of the vehicle is improved.
Referring to fig. 3, a schematic flow chart of a mode control method of a power system of another vehicle according to an embodiment of the present invention is shown. The mode control method of the power system of the vehicle further includes steps S21 to S24:
s21, 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 for 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;
s22, 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;
s23, after the auxiliary driving motor is controlled to enter an active short circuit mode, the switching circuit is controlled to be closed;
and S24, after the switch circuit is controlled to be closed, controlling the auxiliary driving motor to enter a torque output mode.
Specifically, when the vehicle has a demand for auxiliary drive motor output Torque, then the auxiliary drive motor 12 needs to be controlled to enter a Torque output (Torque) mode to assist in providing Torque for vehicle travel. In this case, since the auxiliary driving motor of the vehicle is converted from the freewheel mode to the torque output mode, it is necessary to first acquire the current vehicle speed of the vehicle and determine whether the current vehicle speed is equal to or greater than 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 running at a high speed, the magnitude relation between the dc bus voltage of the auxiliary drive motor 12 and the output voltage of the power battery pack 11 is further determined.
Under the condition, if the dc bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, at this time, if the switch circuit is directly closed, connection between the dc bus of the auxiliary driving motor and the power battery pack is established, which will result in the situation that the auxiliary driving motor 12 charges the power battery pack 11. Thus, the auxiliary drive motor is first controlled to enter an active short circuit (active short circuit, ASC) mode to bring the dc bus voltage of the auxiliary drive motor 12 to 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 whole vehicle controller.
In another case, the mode control method of the power system 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 the output torque of the auxiliary driving motor and the vehicle is currently in a high-speed driving state, if the dc bus voltage of the auxiliary driving motor is smaller than the output voltage of the power battery pack, closing the switch circuit at this time will not cause the auxiliary driving motor 12 to charge the power battery pack 11, so that the switch circuit can be directly controlled to be closed, and the auxiliary driving motor can be further controlled to enter the torque output mode.
In another embodiment, the mode control method of the power system of the vehicle further includes step S26:
and S26, when the vehicle has a requirement for outputting torque of the auxiliary driving motor and the current vehicle speed is smaller than a preset vehicle speed threshold value, 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 the output torque of the auxiliary driving motor, and the vehicle is currently in a low-speed running state, the switch circuit is closed at this time, and in the freewheel mode, the auxiliary driving motor is not reversely towed to cause the voltage at the bus capacitor end, so that the situation that the auxiliary driving motor 12 charges the power battery pack 11 is not caused. Therefore, the switch circuit can be directly controlled to be closed, and the auxiliary driving motor is further controlled to enter a torque output mode.
The embodiment of the invention provides a mode control method of a power system of a vehicle, wherein a switch circuit is additionally arranged in the power system and is used for connecting a power battery pack and a direct current bus of an auxiliary driving motor. When the vehicle has the requirement of outputting torque by the auxiliary driving motor, the auxiliary driving motor needs to be converted into a torque output mode from a follow current mode, if the current speed of the vehicle is greater than or equal to a preset speed threshold value, and the voltage of a direct current bus 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 voltage of the direct current bus of the auxiliary driving motor is zero, the switching circuit is controlled to be disconnected, and the auxiliary driving motor is controlled to enter the torque output mode. By adopting the technical means of the embodiment of the invention, the auxiliary driving motor can be controlled to enter the follow current mode when the vehicle is in a high-speed driving state, the energy consumption of the whole vehicle is effectively reduced, the driving range of the vehicle is improved, and when the follow current mode is required to be converted into the torque output mode, the situation that the DC bus voltage of the auxiliary driving motor is larger than the output voltage of the power battery pack, so that the auxiliary driving motor charges the power battery pack can be avoided, and the safety performance of the power battery is ensured.
Referring to fig. 4, a schematic structural view 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 a main contactor 131, a precharge contactor 132, and a precharge resistor 133.
The first end of the main contactor 131 is connected with the battery pack, and the 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-charge contactor 132 is connected to the first end of the main contactor 131, the second end of the pre-charge contactor 132 is connected to the first end of the pre-charge resistor 133, and the second end of the pre-charge resistor 133 is connected to the second end of the main contactor 131.
Then, in step S12, the switching circuit is controlled to be turned off, specifically: and controlling the main contactor to be opened.
In step S23, the controlling the switch circuit to be closed specifically includes: controlling the prefill contactor to be closed; and after a preset time period passes, controlling the main contactor to be closed, and controlling the pre-charging contactor to be opened.
In the embodiment of the present invention, the main contactor 131 is used to implement the 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 circuit for protecting the main contactor.
In the operation of closing the switch circuit, the pre-charging contactor is firstly closed, and after the pre-charging is completed, the pre-charging contactor is opened and the main contactor is closed, so that the situation that the main contactor is damaged due to the fact that the main contactor is directly electrified at the moment and the instant current is overlarge can be prevented. The pre-charge resistor plays a role in current limiting.
In turn, in the operation of opening the switching circuit, it is essentially the main contactor that is controlled to open, since the pre-charge contactor should normally be in an open state.
Referring to fig. 5, a schematic flow chart of a mode control method of a power system of a preferred vehicle according to an embodiment of the present invention is shown. In the embodiment of the invention, whether the vehicle has the requirement for the output torque of the auxiliary drive motor or not is judged. And if the vehicle has the requirement of outputting torque by the auxiliary driving motor, further acquiring the current speed of the vehicle.
In the first embodiment, if the vehicle is in a high-speed driving state, the magnitude relation 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 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, 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 zero, then, if the main contactor is in an off state, the pre-charging contactor is closed, after the pre-charging is completed, the pre-charging contactor is opened, the main contactor is closed, 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 smaller than the output voltage of the power battery pack, if the main contactor is in an off state, the pre-charging contactor is engaged, after the pre-charging is completed, the pre-charging contactor is opened, the main contactor is engaged, and then 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 opened 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 for outputting torque by the auxiliary driving motor, further acquiring the current speed of the vehicle. In a third embodiment, if the vehicle is in a high-speed driving state, the magnitude relation 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, the dc bus voltage of the auxiliary drive motor is equal to or greater than the output voltage of the power battery pack, and the output torque of the auxiliary drive motor is unloaded; and controls the main contactor to open. And finally, controlling the auxiliary driving motor to enter a follow current mode.
In another case of the third embodiment, the dc bus voltage of the auxiliary driving motor is smaller than the output voltage of the power battery pack, and 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 operating state.
Referring to fig. 6, a schematic structural diagram of a mode control system of a power system 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, and 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 switching circuit control module, and a first mode control module. Wherein, the liquid crystal display device comprises a liquid crystal display device,
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 for the output torque of the auxiliary driving motor and the current speed of the vehicle is greater than or equal to a preset 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 DC 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 disconnected;
the first mode control module is used for controlling the auxiliary driving motor to enter a follow current mode after the switch circuit is controlled to be disconnected.
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 of the auxiliary driving motor is disconnected, so that 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 larger 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 battery power, the energy consumption of the whole vehicle can be effectively reduced, and the driving mileage of the vehicle is improved.
As a preferred embodiment, the mode control device 42 of the power system further includes a second voltage judging 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 for 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 configured to control the auxiliary driving motor to enter an active short circuit mode if the dc bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, so that the dc 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;
the third mode control module is used for controlling the auxiliary driving motor to enter a torque output mode after the switch circuit is controlled to be closed.
By adopting the technical means of the embodiment of the invention, the auxiliary driving motor can be controlled to enter the follow current mode when the vehicle is in a high-speed driving state, the energy consumption of the whole vehicle is effectively reduced, the driving range of the vehicle is improved, and when the follow current mode is required to be converted into the torque output mode, the situation that the DC bus voltage of the auxiliary driving motor is larger than the output voltage of the power battery pack, so that the auxiliary driving motor charges the power battery pack can be avoided, and the safety performance of the power battery is ensured.
Referring to fig. 7, a schematic configuration of a mode control apparatus of a power system 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 the mode control method of the power system of a vehicle as described in the above embodiment when executing the computer program.
It should be noted that, the mode control device for a vehicle power system provided by the embodiment of the present invention is configured to execute all the flow steps of the mode control method for a vehicle power system in the foregoing embodiment, and the working principles and beneficial effects of the two correspond to each other one by one, so that the description is omitted.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a computer readable storage medium, which when executed may comprise the steps 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 (RandomAccessMemory, RAM), or the like.
Referring to fig. 8, a schematic structural diagram of a vehicle according to an embodiment of the present invention is shown. An embodiment of the present invention provides a vehicle 60 including a power system 61 and a mode control device 62 of the power system. Wherein the power system 61 comprises a power battery pack and an auxiliary driving motor, and the power battery pack is connected with a direct current bus of the auxiliary driving motor through a switch circuit; the mode control device 62 of the power system is the mode control device of the power system of the vehicle described in the above embodiment.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the 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 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 speed of the vehicle is greater than or equal to a preset speed threshold, judging the magnitude relation between the DC bus voltage of the auxiliary driving motor and the output voltage of the power battery pack;
if the DC 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 switching circuit to be disconnected;
after the switch circuit is controlled to be disconnected, the auxiliary driving motor is controlled to enter a follow current mode;
wherein the switching circuit comprises a main contactor; the first end of the main contactor is connected with the battery pack, and the second end of the main contactor is connected with the direct current bus of the auxiliary driving motor.
2. The mode control method of a power system of a vehicle according to claim 1, characterized in that after the magnitude relation between the dc bus voltage of the auxiliary drive motor and the output voltage of the power battery pack is judged when the vehicle does not have a demand for the output torque of the auxiliary drive motor and the current vehicle speed of the vehicle is equal to or greater than a preset vehicle speed threshold value, 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 auxiliary driving motor to enter a follow current mode.
3. The mode control method of the power system of the vehicle according to claim 1, characterized in that the method further includes:
and when the vehicle does not have the requirement of the output torque of the auxiliary driving motor and the current vehicle speed is smaller than a preset vehicle speed threshold value, controlling the auxiliary driving motor to enter a follow current mode.
4. The mode control method of the power system of the vehicle according to claim 1, characterized in that the method further includes:
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, 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;
after the auxiliary driving motor is controlled to enter an active short-circuit mode, the switching circuit is controlled to be closed;
after the switch circuit is controlled to be closed, the auxiliary driving motor is controlled to enter a torque output mode.
5. The mode control method of a power system of a vehicle according to claim 4, wherein after determining a magnitude relation 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 equal to or greater than a preset vehicle speed threshold value, 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 mode control method of the power system of the vehicle according to claim 1, characterized in that the method further includes:
when the vehicle has a requirement for outputting torque by the auxiliary driving motor and the current vehicle speed is smaller than a preset vehicle speed threshold value, the switching circuit is controlled to be closed, and after the switching 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 power system of a vehicle according to claim 4, wherein the switching circuit further includes a precharge contactor and a precharge resistor;
the first end of the pre-charging contactor is connected with the first end of the main contactor, the second end of the pre-charging contactor is connected with the first end of the pre-charging resistor, and the second end of the pre-charging resistor is connected with the second end of the main contactor.
8. The method for controlling the mode of the power system of the vehicle according to claim 7, wherein the controlling the opening of the switching circuit is specifically:
controlling the main contactor to be opened;
the control of the switch circuit to be closed is specifically as follows:
controlling the prefill contactor to be closed; and after a preset time period passes, controlling the main contactor to be closed, and controlling the pre-charging contactor to be opened.
9. A mode control system of a power system of a vehicle, characterized by comprising a power system of a vehicle and a mode control device of the power system;
the power system comprises a power battery pack and an auxiliary driving motor, and 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 judging module, an output torque control module, a switching 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 for the output torque of the auxiliary driving motor and the current speed of the vehicle is greater than or equal to a preset 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 DC 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 disconnected;
the first mode control module is used for controlling the auxiliary driving motor to enter a follow current mode after the switch circuit is controlled to be disconnected;
wherein the switching circuit comprises a main contactor; the first end of the main contactor is connected with the battery pack, and the second end of the main contactor is connected with the direct current bus of the auxiliary driving motor.
10. The mode control system of a power system of a vehicle according to claim 9, wherein the mode control device of the power system further includes 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 for 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 configured to control the auxiliary driving motor to enter an active short circuit mode if the dc bus voltage of the auxiliary driving motor is greater than or equal to the output voltage of the power battery pack, so that the dc 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;
the third mode control module is used for controlling the auxiliary driving motor to enter a torque output mode after the switch circuit is controlled to be closed.
11. A mode control apparatus of a power system 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 the mode control method of a power system of a vehicle according to any one of claims 1 to 8 when executing the computer program.
12. A vehicle characterized by comprising 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 device of the power system is the mode control device of the power system of the 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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