CN106611886B - Discharging method and system of hybrid electric vehicle - Google Patents

Discharging method and system of hybrid electric vehicle Download PDF

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Publication number
CN106611886B
CN106611886B CN201510703454.XA CN201510703454A CN106611886B CN 106611886 B CN106611886 B CN 106611886B CN 201510703454 A CN201510703454 A CN 201510703454A CN 106611886 B CN106611886 B CN 106611886B
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power battery
engine
discharge
vehicle
power
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CN106611886A (en
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棘文建
闫磊
胡核
陈武涛
周壮
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BYD Co Ltd
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BYD Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • H02J7/1438—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle in combination with power supplies for loads other than batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • H02J7/1446—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle in response to parameters of a vehicle
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a discharging method and a discharging system of a hybrid electric vehicle, wherein the hybrid electric vehicle comprises a power battery, a bidirectional vehicle-mounted charger, a motor and an engine, and the method comprises the following steps: after receiving an external discharge request, detecting the self state of the power battery, and judging whether the self state meets a preset discharge condition; if the preset discharging condition is met, controlling the bidirectional vehicle-mounted charger to convert the direct current provided by the power battery into alternating current to discharge to external equipment; if the preset discharging condition is not met, the engine is controlled to drive the motor to generate direct current so as to charge the power battery and discharge the direct current to the external equipment, so that the hybrid electric vehicle can continuously discharge the direct current to the outside, particularly can discharge the direct current to the outside when the residual electric quantity is less, the continuous power utilization requirement of a user is met, and the high-power and high-efficiency discharging requirement can be met through the power battery and the bidirectional vehicle-mounted charger.

Description

Discharging method and system of hybrid electric vehicle
Technical Field
The invention relates to the technical field of vehicles, in particular to a discharging method of a hybrid electric vehicle and a discharging system of the hybrid electric vehicle.
Background
In the related art, when discharging to the outside, the vehicle usually discharges only through the in-vehicle socket, and cannot continuously discharge, so that the continuous use requirement of the user cannot be met. In addition, in the related art, the discharge power is small when the discharge is performed externally, the discharge efficiency is low, and is only about 150W, so that the discharge power can only meet the use requirement of small electric equipment. Therefore, there is a need for improvement in the related art.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a discharging method for a hybrid vehicle, which can continuously discharge electricity to the outside of the hybrid vehicle and can achieve high-power and high-efficiency discharge.
Another object of the present invention is to provide a discharge system of a hybrid vehicle.
In order to achieve the above object, an embodiment of the invention provides a discharging method for a hybrid electric vehicle, where the hybrid electric vehicle includes a power battery, a bidirectional vehicle-mounted charger, a motor, and an engine, and the method includes the following steps: after receiving an external discharge request, detecting the self state of the power battery, and judging whether the self state meets a preset discharge condition; if the preset discharging condition is met, controlling the bidirectional vehicle-mounted charger to convert the direct current provided by the power battery into alternating current to discharge to external equipment; and if the preset discharging condition is not met, controlling the engine to drive the motor to generate direct current so as to charge the power battery and discharge the external equipment.
According to the discharging method of the hybrid electric vehicle provided by the embodiment of the invention, after the external discharging request is received, the self state of the power battery is detected, whether the self state meets the preset discharging condition is judged, if the preset discharging condition is met, the bidirectional vehicle-mounted charger is controlled to convert the direct current provided by the power battery into the alternating current to discharge to the external equipment, and if the preset discharging condition is not met, the engine is controlled to drive the motor to generate the direct current to charge the power battery and discharge to the external equipment.
In order to achieve the above object, according to another embodiment of the present invention, an electric discharge system for a hybrid vehicle includes: a bidirectional in-vehicle charger for converting the direct current into an alternating current to discharge to an external device; a power battery, a motor and an engine; the battery manager is used for detecting the self state of the power battery after receiving an external discharge request, judging whether the self state meets a preset discharge condition, if the preset discharge condition is met, controlling the bidirectional vehicle-mounted charger to convert direct current provided by the power battery into alternating current to discharge to external equipment, and if the preset discharge condition is not met, controlling the engine to drive the motor to emit the direct current to charge the power battery and discharge to the external equipment.
According to the discharging system of the hybrid electric vehicle provided by the embodiment of the invention, after receiving an external discharging request, the battery manager detects the self state of the power battery and judges whether the self state meets the preset discharging condition or not, if the preset discharging condition is met, the bidirectional vehicle-mounted charger is controlled to convert direct current provided by the power battery into alternating current to discharge to external equipment, and if the preset discharging condition is not met, the engine is controlled to drive the motor to generate direct current to charge the power battery and discharge to the external equipment, so that the system can enable the hybrid electric vehicle to continuously discharge to the outside, particularly can also discharge to the outside when the residual electric quantity is less, the continuous power utilization requirement of a user is met, and the high-power and high-efficiency discharging requirement can be met through the power battery and the bidirectional vehicle-mounted charger.
Drawings
Fig. 1 is a flowchart of a discharging method of a hybrid vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic energy transfer diagram of a discharge method of a hybrid vehicle according to an embodiment of the present invention;
FIG. 3 is a schematic energy transmission diagram of a discharging method of a hybrid vehicle according to another embodiment of the present invention;
FIG. 4 is a flowchart of a discharging method of a hybrid vehicle according to an embodiment of the present invention;
FIG. 5 is a block schematic diagram of a discharge system of a hybrid vehicle according to an embodiment of the present invention;
fig. 6 is a signal interaction diagram of a discharge system of a hybrid vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a discharging method and system of a hybrid vehicle according to an embodiment of the present invention with reference to the drawings.
Fig. 1 is a flowchart of a discharging method of a hybrid vehicle according to an embodiment of the present invention. The hybrid electric vehicle comprises a power battery, a bidirectional vehicle-mounted charger, a motor and an engine, wherein the power battery is used for storing electric energy; the bidirectional vehicle-mounted charging has a bidirectional inversion function, namely the bidirectional vehicle-mounted charging can invert direct current into alternating current and rectify the alternating current into direct current.
As shown in fig. 1, the discharging method of the hybrid vehicle according to the embodiment of the present invention includes the steps of:
s1: after receiving an external discharge request, detecting the self state of the power battery, and judging whether the self state meets a preset discharge condition.
When a user has a discharging requirement, the discharging gun can be connected to the bidirectional vehicle-mounted charger or a discharging mode is selected, the bidirectional vehicle-mounted charger can send an external discharging request to the battery manager, and the battery manager immediately detects the self state of the power battery after receiving the external discharging request. The battery manager and the bidirectional vehicle-mounted charger CAN communicate through a CAN bus.
It should be noted that the self-state of the power battery may include at least one of a remaining capacity, a voltage, a current, a charging power, a discharging power and a fault signal of the power battery. According to an embodiment of the present invention, the preset discharging condition may be whether the remaining capacity of the power battery is greater than or equal to a third preset threshold, that is, if the remaining capacity of the power battery is greater than or equal to the third preset threshold, it is determined that the self state meets the preset discharging condition; and if the residual capacity of the power battery is less than a third preset threshold value, judging that the self state does not meet the preset discharging condition.
S2: and if the preset discharge condition is met, controlling the bidirectional vehicle-mounted charger to convert the direct current provided by the power battery into alternating current to discharge to external equipment, wherein the energy transmission schematic diagram is shown in FIG. 2.
Specifically, one end of the bidirectional vehicle-mounted charger may be connected to the power battery, and the other end of the bidirectional vehicle-mounted charger may be connected to the external device, wherein the other end of the bidirectional vehicle-mounted charger may be connected to the external device through the discharge gun when discharging, and if the self state of the power battery satisfies a preset discharge condition, as shown in fig. 2, the bidirectional vehicle-mounted charger may invert a direct current provided by the power battery into an alternating current and output the alternating current to the discharge gun to provide electric power to the external power device connected to the discharge gun. It should be understood that the power battery can also be charged by a bidirectional vehicle-mounted charger, the other end of the bidirectional vehicle-mounted charger can be connected with an external device through a charging gun during charging, the external power supply device outputs alternating current to the bidirectional vehicle-mounted charger through the charging gun, and the bidirectional vehicle-mounted charger rectifies the alternating current into direct current to charge the power battery.
According to one specific example of the invention, the bi-directional on-board charger may discharge to an external device through an in-vehicle socket and/or an out-vehicle VTOL interface. That is, the user may select the external VTOL interface to discharge to the outside, or the internal vehicle socket to discharge to the outside, or both the external VTOL interface and the internal vehicle socket to discharge to the outside simultaneously. Specifically, taking the external VTOL interface as an example, the external VTOL interface may be an interface for connecting a discharging gun or a charging gun to discharge to the outside, where VTOL refers to converting dc power into ac power to discharge to the outside.
S3: and if the preset discharge condition is not met, controlling the engine to drive the motor to generate direct current so as to charge the power battery and discharge the direct current to external equipment, wherein the energy transmission diagram is shown in figure 3.
That is, the engine can drive the motor to generate power, as shown in fig. 3, when the motor generates power, the direct current generated by the motor can be provided to the power battery, so that the power battery can provide the direct current for the bidirectional vehicle-mounted charger while the power battery is charged by the power generated by the motor, in other words, the power battery still responds to the external discharge request of the bidirectional vehicle-mounted charger during the charging process.
In particular, the bi-directional on-board charger may monitor the user's demand for charging and discharging, such as the discharging demand, when a user connects an external electric device to the in-vehicle socket, a detection circuit in the bidirectional in-vehicle charger is triggered and outputs a trigger signal, then the singlechip in the bidirectional vehicle-mounted charger judges the requirement of the user according to the trigger signal and outputs a corresponding request signal (for example, outputs an external discharge request when judging the discharge requirement of the user) to the battery manager, the battery manager can control the power supply loop between the bidirectional vehicle-mounted charger and the power battery to be switched on so as to output voltage to the bidirectional vehicle-mounted charger and output an external discharge signal to the singlechip of the bidirectional vehicle-mounted charger, the MOS tube of the bidirectional vehicle-mounted charger is controlled to be closed through the single chip microcomputer, so that the bidirectional vehicle-mounted charger is enabled to start a driving function and starts inversion to discharge outwards.
Meanwhile, the battery manager also monitors the self state of the power battery in real time, judges whether a preset discharging condition is met or not according to the self state of the power battery, if so, the MOS (metal oxide semiconductor) tube of the bidirectional vehicle-mounted charger is continuously controlled to be closed, the bidirectional vehicle-mounted charger inverts direct current provided by the power battery into alternating current, and external electric equipment obtains a preset voltage of alternating current of 220V for example; if the voltage does not meet the preset voltage requirement, the MOS tube of the bidirectional vehicle-mounted charger is continuously controlled to be closed, the engine is controlled to drive the motor to generate direct current so as to charge the power battery, meanwhile, the direct current provided by the power battery is still inverted into alternating current by the bidirectional vehicle-mounted charger, and external electric equipment obtains the alternating current with the preset voltage of 220V for example.
In addition, when a discharge finishing instruction is received or the external equipment is removed, the MOS tube can be controlled to be turned off through the single chip microcomputer so as to close the inverter function of the bidirectional vehicle-mounted charger, and therefore discharge is finished.
Therefore, the monitoring of the self state of the power battery and the monitoring of the user on the charging and discharging requirements can be realized through the inversion of the bidirectional vehicle-mounted charger and the control of the battery manager, the charging and discharging functions are realized, in addition, the method can enable the hybrid electric vehicle to continuously discharge outwards, especially when the residual electric quantity is less, the external discharging can be realized, the continuous power utilization requirements of the user are met, and the high-power and high-efficiency discharging requirements can be met through the power battery and the bidirectional vehicle-mounted charger.
Further, according to an embodiment of the present invention, after determining that the self-state does not satisfy the preset discharging condition, the method further includes: detecting the residual electric quantity of the power battery, and judging whether the residual electric quantity is less than or equal to a first preset threshold value; if so, controlling the bidirectional vehicle-mounted charger to stop inverting; if not, controlling the engine to drive the motor to generate direct current.
That is to say, after the self state of the power battery is judged not to meet the preset discharging condition, for example, when the remaining capacity of the power battery is smaller than a third preset threshold, whether the remaining capacity is smaller than or equal to the first preset threshold is further judged, if yes, it is indicated that the power battery needs to be over-discharged protected, the output of a signal allowing external discharging is stopped, and the MOS tube is controlled to be turned off through the single chip microcomputer so as to close the inversion function of the bidirectional vehicle-mounted charger; if not, indicating that over-discharge protection is not needed for the power battery, the engine can be controlled to drive the motor to generate direct current to charge the power battery, and the power battery still provides direct current for the bidirectional vehicle-mounted charger in the charging process. Therefore, the power battery can be protected, and the discharge is stopped when the voltage of the power battery is very low, so that the service life of the power battery is prevented from being influenced by the over-discharge.
And when the third preset threshold value is larger than the first preset threshold value.
According to an embodiment of the present invention, controlling the engine to drive the motor to generate dc power specifically includes: the motor controller distributes the output torques of the motor and the engine according to the charge-discharge power of the power battery, the working state of the engine, the generating power of the whole vehicle and the current required torque, and controls the motor to output the torque according to the output torque distributed to the motor; the engine controller controls the engine to perform torque output in accordance with the output torque distributed to the engine.
That is, when the remaining capacity of the power battery is greater than the first preset threshold and less than the second preset threshold, the battery manager may transmit a request to start the engine to the motor controller, the motor controller may transmit a request to start the engine signal in response to the request transmitted by the battery manager, and may transmit a request to start the engine command to the engine controller, and the engine controller may start the engine command in response to the request transmitted by the motor controller. And simultaneously, the motor controller selects a corresponding control strategy, namely the output torques of the motor and the engine are distributed according to the current required torque, the generated power of the whole vehicle and the charging and discharging power of the power battery, so that the motor controller can control the motor to output the torque according to the output torque distributed to the motor, and the engine controller can also respond to the output torque of the engine by combining the self state of the engine, namely the engine is controlled to output the torque according to the output torque distributed to the engine, thereby controlling the generated power.
Therefore, the power generation of the motor is controlled, the requirement that the bidirectional vehicle-mounted charger discharges continuously to the outside can be met, and the power battery can be charged.
Further, in the process of charging the power battery, the discharging method of the hybrid electric vehicle further includes: and when the residual electric quantity of the power battery is greater than a second preset threshold value, controlling the engine to stop working, and continuously controlling the bidirectional vehicle-mounted charger to convert the direct current provided by the power battery into alternating current, wherein the second preset threshold value is greater than the first preset threshold value, and the second preset threshold value is greater than a third preset threshold value.
That is to say, the power battery can be charged by the direct current generated by the motor until the remaining capacity of the power battery is greater than the second preset threshold, and when the remaining capacity is greater than the second preset threshold, it is indicated that the power battery does not need to be charged, the engine can be controlled to stop working, and the power battery continues to provide the direct current for the bidirectional vehicle-mounted charger.
As described above, the discharge method according to the embodiment of the present invention specifically includes the following steps as shown in fig. 4:
s101: the battery manager determines whether to acquire the mode selected by the user. If the user selects the charging mode, performing step S102; if the user selects the discharging mode, step S105 is performed.
S102: the battery manager judges whether to output a charging permission signal to the bidirectional vehicle-mounted charger according to the self state of the power battery, such as residual capacity, fault information and the like. If yes, executing step S103; if not, step S104 is executed.
S103: the battery manager enters a charging process to charge the power battery through the external power supply device, and when it is determined that the power battery is fully charged, the process proceeds to step S104.
S104: and (5) finishing the charging process, and controlling the rectification charging function of the bidirectional vehicle-mounted charger to be closed by the battery manager.
S105: the battery manager judges whether to output a discharging permission signal to the bidirectional vehicle-mounted charger according to the self state of the power battery, such as residual capacity, fault information and the like. If yes, go to step S106; if not, step S117 is performed.
S106: the battery manager enters the discharging flow and performs step S117 when the user selects to end the discharging.
S107: and the battery manager judges whether the self state of the power battery meets a preset discharging condition. If yes, returning to the step S106; if not, step S108 is performed.
S108: the battery manager judges whether the residual capacity of the power battery is less than or equal to a first preset threshold value. If yes, go to step S109; if not, steps S110 and S112 are performed.
In an example of the present invention, step S110 may be performed first, and step S112 may be performed after a preset time.
S109: the battery manager turns off the discharge permission signal, exits the discharge process, and proceeds to step S117.
S110: the motor controller judges whether the self state of the motor meets the starting condition. If yes, executing step S111; if not, step S112 is performed.
S111: the motor controller controls the motor to start and controls the motor to output torque to control the generated power, and performs step S115.
S112: the engine controller judges whether the self state of the engine meets the starting condition. If so, go to step S113; if not, step S114 is performed.
S113: the engine controller controls the engine to start and controls the engine to output torque to control the generated power.
S114: the battery manager turns off the discharge permission signal, exits the discharge process, and proceeds to step S117.
S115: and the battery manager judges whether the electric quantity of the power battery is larger than a second preset threshold value. If yes, returning to the step S106; if not, step S116 is performed.
S116: returning to the step S115, the engine drives the motor to generate power until the remaining power of the power battery reaches the second preset threshold, and exiting the engine power generation process when the remaining power reaches the second preset threshold, and continuing to discharge power from the power battery.
S117: and (5) finishing the discharging process, and controlling the inversion discharging function of the bidirectional vehicle-mounted charger to be closed by the battery manager.
In summary, according to the discharging method of the hybrid electric vehicle provided by the embodiment of the invention, after the external discharging request is received, the self state of the power battery is detected, and whether the self state meets the preset discharging condition is judged, if the preset discharging condition is met, the bidirectional vehicle-mounted charger is controlled to convert the direct current provided by the power battery into the alternating current to discharge to the external device, and if the preset discharging condition is not met, the engine is controlled to drive the motor to generate the direct current to charge the power battery and discharge to the external device, so that the method can enable the hybrid electric vehicle to continuously discharge to the outside, particularly can also discharge to the outside when the residual electric quantity is small, meets the continuous power consumption requirement of a user, and can meet the high-power and high-efficiency discharging requirement through the power battery and the bidirectional vehicle-mounted charger.
In order to execute the method of the embodiment, the embodiment of the invention also provides a discharge system of the hybrid electric vehicle.
Fig. 5 is a block diagram system of a discharge system of a hybrid vehicle according to an embodiment of the present invention. As shown in fig. 5, the discharge system of the hybrid vehicle includes: the bidirectional vehicle-mounted charger 10, the power battery 20, the motor 30, the engine 40 and the battery manager 50.
Wherein, the power battery 20 is used for storing electric energy; the bidirectional in-vehicle charger 10 is used to convert direct current into alternating current to discharge to an external device, and in addition, the bidirectional in-vehicle charger 10 has a bidirectional inverter function, that is, the bidirectional in-vehicle charger 10 can invert direct current into alternating current and rectify alternating current into direct current.
The battery manager 50 is configured to detect a self state of the power battery 20 after receiving an external discharge request, and determine whether the self state satisfies a preset discharge condition, if the preset discharge condition is satisfied, the battery manager 50 controls the bidirectional vehicle charger 10 to convert direct current provided by the power battery 20 into alternating current to discharge to an external device, and if the preset discharge condition is not satisfied, the battery manager 50 controls the motor 40 to drive the motor 30 to emit direct current to charge and discharge the power battery 20 to the external device. That is, the engine 40 can drive the motor 30 to generate power, as shown in fig. 3, when the motor 30 generates power, the direct current generated by the motor 30 can be provided to the power battery 20, so that the power battery 20 can provide the direct current for the bidirectional vehicle-mounted charger 10 while the power battery 20 is charged by the power generated by the motor 30, in other words, the power battery 20 still responds to the external discharge request of the bidirectional vehicle-mounted charger 10 during the charging process.
When a user has a discharging demand, the discharging gun can be connected to the bidirectional vehicle-mounted charger 10 or the discharging mode can be selected, the bidirectional vehicle-mounted charger 10 can send an external discharging request to the battery manager 50, and the battery manager 50 detects the self state of the power battery 20 immediately after receiving the external discharging request. Wherein the battery manager 50 and the bi-directional in-vehicle charger 10 may communicate via the CAN bus.
It should be noted that the self-state of the power battery 20 may include at least one of a remaining capacity, a voltage, a current, a charging power, a discharging power, and a fault signal of the power battery 20. According to an embodiment of the present invention, the preset discharging condition may be whether the remaining capacity of the power battery 20 is greater than or equal to a third preset threshold, that is, if the remaining capacity of the power battery 20 is greater than or equal to the third preset threshold, the battery manager 50 determines that the self status satisfies the preset discharging condition; if the remaining capacity of the power battery 20 is less than the third preset threshold, the battery manager 50 determines that the self state does not satisfy the preset discharge condition.
In addition, it should be understood that one end of the bidirectional in-vehicle charger 10 may be connected to the power battery 20 and the other end of the bidirectional in-vehicle charger 10 may be connected to an external device, wherein the other end of the bidirectional in-vehicle charger 10 may be connected to the external device through a discharge gun at the time of discharge, and if the self-state of the power battery 20 satisfies a preset discharge condition, as shown in fig. 2, the bidirectional in-vehicle charger 10 may invert a direct current provided from the power battery 20 into an alternating current and output the alternating current to the discharge gun to supply power to the external power consuming device connected to the discharge gun. Of course, the user may also charge the power battery 20 through the bidirectional vehicle-mounted charger 10, the other end of the bidirectional vehicle-mounted charger 10 may be connected to an external device through a charging gun during charging, the external power supply device outputs alternating current to the bidirectional vehicle-mounted charger 10 through the charging gun, and the bidirectional vehicle-mounted charger 10 rectifies the alternating current into direct current to charge the power battery 20.
According to one specific example of the present invention, the bi-directional in-vehicle charger 10 may discharge to an external device through an in-vehicle socket and/or an out-vehicle VTOL interface. That is, the user may select the external VTOL interface to discharge to the outside, or the internal vehicle socket to discharge to the outside, or both the external VTOL interface and the internal vehicle socket to discharge to the outside simultaneously. Specifically, taking the external VTOL interface as an example, the external VTOL interface may be an interface for connecting a discharging gun or a charging gun to discharge to the outside, where VTOL refers to converting dc power into ac power to discharge to the outside.
Specifically, the bi-directional on-board charger 10 may monitor the user's demand for charging and discharging, such as the discharging demand, when the user connects the external electric power consumption device to the in-vehicle cradle, the detection circuit in the bidirectional in-vehicle charger 10 is triggered and outputs a trigger signal, then the single chip microcomputer in the bidirectional vehicle-mounted charger 10 judges the requirement of the user according to the trigger signal and outputs a corresponding request signal (for example, outputs an external discharging request when judging the discharging requirement of the user) to the battery manager 50, the battery manager 50 can control the power supply loop between the bidirectional vehicle-mounted charger 10 and the power battery 20 to be switched on so as to output voltage to the bidirectional vehicle-mounted charger 10 and output an external discharging permission signal to the single chip microcomputer of the bidirectional vehicle-mounted charger 10, the MOS tube of the bidirectional vehicle-mounted charger 10 is controlled to be closed through the single chip microcomputer, so that the bidirectional vehicle-mounted charger 10 is enabled to start a driving function and start inversion to discharge to the outside.
Meanwhile, the battery manager 50 also monitors the self state of the power battery 20 in real time, and judges whether the preset discharging condition is met or not according to the self state of the power battery 20, if so, the battery manager 50 continuously controls the closing of the MOS transistor of the bidirectional vehicle-mounted charger 10, the bidirectional vehicle-mounted charger 10 inverts the direct current provided by the power battery 20 into alternating current, and the external electric equipment obtains the preset voltage, such as alternating current of 220V; if not, the battery manager 50 continues to control the MOS transistor of the bidirectional vehicle-mounted charger 10 to close, and controls the motor 40 to drive the motor 30 to generate direct current to charge the power battery 20, while the bidirectional vehicle-mounted charger 10 still inverts the direct current provided by the power battery 20 into alternating current, and the external electric device obtains a preset voltage, for example, 220V alternating current.
In addition, when the battery manager 50 receives a discharge ending instruction or the external device is removed, the MOS transistor may be controlled by the single chip to turn off the inverter function of the bidirectional in-vehicle charger 10, thereby ending the discharge.
Therefore, the monitoring of the self state of the power battery 20 and the monitoring of the charging and discharging requirements of the user can be realized through the inversion of the bidirectional vehicle-mounted charger 10 and the control of the battery manager 50, the charging and discharging functions are realized, the system can enable the hybrid electric vehicle to continuously discharge outwards, especially can discharge outwards when the residual electric quantity is less, the continuous power utilization requirements of the user are met, and the high-power and high-efficiency discharging requirements can be met through the power battery 20 and the bidirectional vehicle-mounted charger 10.
Further, according to an embodiment of the present invention, after determining that the self-state does not satisfy the preset discharging condition, the battery management is further configured to detect a remaining capacity of the power battery 20, determine whether the remaining capacity is less than or equal to a first preset threshold, if so, control the bidirectional vehicle-mounted charger 10 to stop inverting, and if not, control the engine 40 to drive the motor 30 to generate dc power.
That is to say, after determining that the self state of the power battery 20 does not satisfy the preset discharge condition, for example, when the remaining power of the power battery 20 is smaller than a third preset threshold, the battery manager 50 further determines whether the remaining power is smaller than or equal to the first preset threshold, if so, it indicates that the over-discharge protection needs to be performed on the power battery 20, the battery manager 50 stops outputting a signal allowing external discharge, and the single chip microcomputer controls the MOS transistor to be turned off to close the inverter function of the bidirectional vehicle-mounted charger 10; if not, it indicates that the power battery 20 does not need to be over-discharged, the battery manager 50 may control the motor 40 to drive the motor 30 to generate dc power to charge the power battery 20, and the power battery 20 still provides dc power to the bidirectional vehicle charger 10 during the charging process. Therefore, the power battery 20 can be protected, and the discharge is stopped when the voltage of the power battery 20 is very low, so that the service life of the power battery 20 is prevented from being influenced by the over-discharge.
And when the third preset threshold value is larger than the first preset threshold value.
According to an embodiment of the present invention, as shown in fig. 5, the discharging system further includes a motor controller 60 and an engine controller 70, wherein when the battery manager 50 controls the engine 40 to drive the motor 30 to generate dc power, the motor controller 60 distributes output torques of the motor 30 and the engine 40 according to the charging and discharging power of the power battery 20, the engine operating state, the power generated by the entire vehicle, and the current required torque, and controls the motor 30 to output torque according to the output torque distributed to the motor 30; the engine controller 70 controls the engine 40 to perform torque output in accordance with the output torque distributed to the engine 40.
That is, when the remaining capacity of the power battery 20 is greater than the first preset threshold and less than the second preset threshold, the battery manager 50 may transmit a request to start the engine to the motor controller 60, the motor controller 60 may transmit a request to start the engine in response to the request to start the engine signal transmitted by the battery manager 50, and may transmit a request to start the engine to the engine controller 70, and the engine controller 70 may transmit a request to start the engine in response to the request to start the engine transmitted by the motor controller 60. Meanwhile, the motor controller 60 selects a corresponding control strategy, that is, the output torques of the motor 30 and the engine 40 are distributed according to the current required torque, the generated power of the whole vehicle and the charging and discharging power of the power battery 20, so that the motor controller 60 can control the motor 30 to output the torque according to the output torque distributed to the motor 30, and the engine controller 70 can also respond to the engine output torque by combining the engine state, that is, control the engine 40 to output the torque according to the output torque distributed to the engine 40, thereby controlling the generated power.
Thus, by controlling the motor to generate power, the bidirectional in-vehicle charger 10 can charge the power battery 20 while satisfying the requirement of continuous external discharge.
Further, according to an embodiment of the present invention, during the charging process of the power battery 20, when the remaining capacity of the power battery 20 is greater than a second preset threshold, the battery manager 50 further controls the engine to stop working, and continues to control the bidirectional onboard charger 10 to convert the dc power provided by the power battery 20 into ac power, wherein the second preset threshold is greater than the first preset threshold.
That is, the discharging system may charge the power battery 20 through the dc power generated by the motor 30 until the remaining power of the power battery 20 is greater than the second preset threshold, and when the remaining power is greater than the second preset threshold, it indicates that the power battery 20 does not need to be charged, the battery manager 50 may control the engine to stop working, that is, the battery manager 50 sends a signal requesting an engine stop to the motor controller 60, at this time, the motor controller 60 responds to the signal requesting the engine stop sent by the battery manager 50 and sends an engine stop command to the engine controller 70, and meanwhile, the charging system continues to provide the dc power to the bidirectional vehicle charger 10 through the power battery 20.
As described above, an information interaction diagram of the discharge system according to the embodiment of the present invention is shown in fig. 6.
The bidirectional in-vehicle charger 10OBC transmits an external discharge request to the battery manager 50 by the selection of the user.
The battery manager BMS50 detects the self state of the power battery 20 after the external discharging request sent by the bidirectional vehicle charger 10, and sends a signal for allowing the external discharging to the bidirectional vehicle charger 10 when the self state of the power battery 20 satisfies a preset discharging condition and the remaining power is greater than a first preset threshold. While continuing to detect the own state of the power battery 20 such as the charge and discharge power, the amount of electricity, and the like.
When the battery manager BMS50 detects that the self state of the power battery 20 does not satisfy the preset discharge condition and the remaining capacity is greater than the first preset threshold value, it sends a signal requesting the start of the engine to the motor controller 60.
The motor controller ECN60 responds to the request of the battery manager 50 to start the engine signal in combination with the state of the motor itself, and sends a request to start the engine to the engine controller ECM70, and at the same time, the motor controller 60 selects a corresponding control strategy, for example, adopts an active control strategy, distributes the output torques of the motor 30 and the engine 40 according to the charge and discharge power of the power battery 20, the engine operating state, the vehicle generated power and the current required torque, and further controls the discharge power, thereby satisfying the requirement of the bidirectional vehicle charger 10 for continuous external discharge and charging the power battery 20.
The engine controller ECM70 responds to a request to start the engine command from the motor controller 60 and responds to the output torque distributed to the engine 40 in conjunction with the engine's own state to control the generated power.
When the battery manager 50 judges that the remaining circuits of the power battery 20 are greater than the second preset threshold value, the battery manager 50 sends a request engine stall signal to the motor controller 60, at this time, the motor controller 60 responds to the request engine stall signal of the battery manager 50 and sends an engine stall command to the engine controller 70, and the engine controller 7 stalls in response to the engine stall command.
In summary, according to the discharging system of the hybrid electric vehicle provided in the embodiment of the present invention, after receiving the external discharging request, the battery manager detects the self state of the power battery, and determines whether the self state satisfies the preset discharging condition, if the preset discharging condition is satisfied, the bidirectional vehicle-mounted charger is controlled to convert the direct current provided by the power battery into the alternating current to discharge to the external device, and if the preset discharging condition is not satisfied, the engine is controlled to drive the motor to generate the direct current to charge the power battery and discharge to the external device.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (6)

1. A discharging method of a hybrid electric vehicle, which is characterized by comprising a power battery, a bidirectional vehicle-mounted charger, a motor and an engine, and comprises the following steps:
after receiving an external discharge request, detecting the self state of the power battery, and judging whether the self state meets a preset discharge condition, wherein the preset discharge condition is that the residual electric quantity of the power battery is greater than or equal to a third preset threshold value;
if the preset discharging condition is met, controlling the bidirectional vehicle-mounted charger to convert the direct current provided by the power battery into alternating current to discharge to external equipment;
if the preset discharging condition is not met, controlling the engine to drive the motor to generate direct current so as to charge the power battery and discharge the direct current to the external equipment, wherein after the self state is judged not to meet the preset discharging condition, the method further comprises the following steps:
detecting the residual electric quantity of the power battery, and judging whether the residual electric quantity is less than or equal to a first preset threshold value;
if so, controlling the bidirectional vehicle-mounted charger to stop inverting;
if not, controlling the engine to drive the motor to generate direct current, wherein in the process of charging the power battery, the method further comprises the following steps:
when the residual capacity of the power battery is larger than a second preset threshold value, controlling the engine to stop working, and continuously controlling the bidirectional vehicle-mounted charger to convert the direct current provided by the power battery into alternating current, wherein the second preset threshold value is larger than the first preset threshold value, and the second preset threshold value is larger than a third preset threshold value.
2. The discharging method of a hybrid vehicle according to claim 1, wherein controlling the engine to drive the electric machine to generate dc power specifically comprises:
the motor controller distributes the output torques of the motor and the engine according to the charge-discharge power of the power battery, the working state of the engine, the power generation power of the whole vehicle and the current required torque, and controls the motor to output the torque according to the output torque distributed to the motor;
an engine controller controls the engine to perform torque output in accordance with an output torque distributed to the engine.
3. The discharging method of a hybrid vehicle according to any one of claims 1 to 2, wherein the bidirectional in-vehicle charger discharges to the external device through an in-vehicle socket and/or an out-vehicle VTOL interface.
4. A discharge system of a hybrid vehicle, characterized by comprising:
a bidirectional in-vehicle charger for converting the direct current into an alternating current to discharge to an external device;
a power battery, a motor and an engine;
the battery manager is used for detecting the self state of the power battery after receiving an external discharge request, judging whether the self state meets a preset discharge condition or not, if the self state meets the preset discharge condition, controlling the bidirectional vehicle-mounted charger to convert direct current provided by the power battery into alternating current to discharge to external equipment, and if the self state does not meet the preset discharge condition, controlling the engine to drive the motor to emit the direct current to charge the power battery and discharge to the external equipment, wherein the preset discharge condition is that the residual electric quantity of the power battery is larger than or equal to a third preset threshold; wherein the battery management is further configured to, after determining that the self-status does not satisfy a preset discharge condition,
detecting the residual electric quantity of the power battery, judging whether the residual electric quantity is less than or equal to a first preset threshold value, if so, controlling the bidirectional vehicle-mounted charger to stop inversion, if not, controlling the engine to drive the motor to generate direct current, wherein in the process of charging the power battery,
when the residual capacity of the power battery is larger than a second preset threshold value, the battery manager further controls the engine to stop working and continuously controls the bidirectional vehicle-mounted charger to convert direct current provided by the power battery into alternating current, wherein the second preset threshold value is larger than the first preset threshold value, and the second preset threshold value is larger than the third preset threshold value.
5. The discharging system of a hybrid vehicle according to claim 4, further comprising a motor controller and an engine controller, wherein when the battery manager controls the engine to drive the motor to generate the DC power,
the motor controller distributes the output torques of the motor and the engine according to the charge and discharge power of the power battery, the working state of the engine, the generating power of the whole vehicle and the current required torque, and controls the motor to output the torque according to the output torque distributed to the motor;
the engine controller controls the engine to perform torque output in accordance with an output torque distributed to the engine.
6. The discharging system of a hybrid vehicle according to any one of claims 4 to 5, wherein the bidirectional on-board charger discharges to the external device through an in-vehicle socket and/or an out-vehicle VTOL interface.
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