CN110077278B - Discharge management method and system for plug-in hybrid electric vehicle - Google Patents

Discharge management method and system for plug-in hybrid electric vehicle Download PDF

Info

Publication number
CN110077278B
CN110077278B CN201910362631.0A CN201910362631A CN110077278B CN 110077278 B CN110077278 B CN 110077278B CN 201910362631 A CN201910362631 A CN 201910362631A CN 110077278 B CN110077278 B CN 110077278B
Authority
CN
China
Prior art keywords
power
discharge
vehicle
battery
air conditioning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910362631.0A
Other languages
Chinese (zh)
Other versions
CN110077278A (en
Inventor
陈文明
牛珍吉
尹兴起
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Geely Holding Group Co Ltd
Geely Automobile Research Institute Ningbo Co Ltd
Original Assignee
Zhejiang Geely Holding Group Co Ltd
Geely Automobile Research Institute Ningbo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Geely Holding Group Co Ltd, Geely Automobile Research Institute Ningbo Co Ltd filed Critical Zhejiang Geely Holding Group Co Ltd
Priority to CN201910362631.0A priority Critical patent/CN110077278B/en
Publication of CN110077278A publication Critical patent/CN110077278A/en
Application granted granted Critical
Publication of CN110077278B publication Critical patent/CN110077278B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • 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
    • 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
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention provides a discharge management method and system for a plug-in hybrid electric vehicle, and belongs to the technical field of plug-in hybrid electric vehicles. The problem that the hybrid vehicle is difficult to normally run due to external discharge in the prior art is solved. A discharge management method of a plug-in hybrid vehicle, comprising the steps of: A. high pressure on the whole vehicle; B. selecting whether the power battery supplies power; C. the power is limited. A discharge management system of a plug-in hybrid electric vehicle comprises a vehicle control unit, a relay unit, a battery controller connected with the relay unit, an air conditioner controller capable of limiting the power consumption of an air conditioning system and a charge and discharge controller capable of limiting the discharge power of a bidirectional charger, wherein the charge and discharge controller, the battery controller and the air conditioner controller are respectively connected with the vehicle control unit, and the vehicle control unit is further connected with a detection unit. The invention can avoid the situation that the vehicle is difficult to normally run when the vehicle discharges to the outside.

Description

Discharge management method and system for plug-in hybrid electric vehicle
Technical Field
The invention belongs to the technical field of plug-in hybrid vehicles, and relates to a discharge management method and system of a plug-in hybrid vehicle.
Background
The automobile technology develops along with the development of the society, and the plug-in hybrid electric vehicle is a novel hybrid electric vehicle, can be externally charged, combines a traditional power system and a pure electric power system together, and makes up respective disadvantages.
The plug-in hybrid electric vehicle comprises an engine, a motor, a power battery, a storage battery, a vehicle control unit, a battery management system for acquiring the state of the power battery and performing over-discharge protection On the power battery, a DCDC converter for converting high-voltage direct current into low-voltage direct current to supply power to electric equipment in the vehicle (DCDC is direct current to direct current), an air conditioning system for performing thermal management On the power battery and performing thermal management in the vehicle, and a Charger (On-board Charger is abbreviated as OBC).
At present, a vehicle type provided with a bidirectional charger is arranged on a plug-in hybrid electric vehicle, the bidirectional charger can charge a power battery when a charging gun is plugged in, external discharge is carried out when a discharging gun is plugged in, and high-voltage direct current of a high-voltage battery is converted into alternating current of about 220V for external equipment to use. At present, as shown in a discharging method and a discharging system of a hybrid electric vehicle disclosed in chinese patent application No. cn201510703454.x, a management method for external discharging of a hybrid electric vehicle detects a self-state of a power battery after receiving an external discharging request, and determines whether the self-state meets a preset discharging 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.
Although the discharging method and the discharging system of the hybrid electric vehicle can realize the continuous external discharge of the hybrid electric vehicle to a certain extent, the power consumption of electric equipment in the vehicle and the power consumption of an air conditioning system are not considered, when the engine does not start the power supply power battery to supply power alone, and the peak discharge power of the power battery is less than the sum of the power consumption power of a DCDC converter, the power consumption power of the air conditioning system and the power consumption power of external equipment in the discharging process, the continuous peak discharge power discharge of the power battery cannot meet the power consumption of the current electric equipment, although the power quantity of the power battery is still large, the peak discharge power of the power battery is too low to trigger the power battery protection of a battery management system, so that the power battery stops supplying power, the functions of the vehicle power battery and a bidirectional vehicle-mounted charger are unavailable, and the vehicle is difficult to normally run, even if the power battery protection of the battery management system is not triggered, the low voltage output by insufficient power of the DCDC converter is difficult to maintain the power consumption of the internal electric equipment of the vehicle, so that the storage battery supplies power to the internal electric equipment of the vehicle, the electric quantity of the storage battery is small, the storage battery is damaged, the internal electric equipment of the vehicle enters the dormant vehicle function and cannot be normally used, and the vehicle cannot be started again to run after the storage battery is in power failure. The prior art does not manage the discharge of the hybrid vehicle reasonably and safely.
Disclosure of Invention
The invention provides a discharge management method and a discharge management system of a plug-in hybrid vehicle, aiming at the problems in the prior art, and the technical problem solved by the discharge management method and the discharge management system of the plug-in hybrid vehicle is how to avoid the situation that the vehicle is difficult to normally run when the vehicle discharges to the outside.
The invention is realized by the following technical scheme: a discharge management method of a plug-in hybrid vehicle includes the following steps:
A. high pressure on the whole vehicle: the vehicle control unit receives the discharge request and controls the power battery to be communicated with the bidirectional charger, the air conditioning system and the DCDC converter respectively;
B. selecting whether the power battery supplies power: the vehicle control unit acquires the state of a power battery in real time through a battery management system, and selects the power battery to supply power when the condition for triggering the engine to supply power is not met;
C. limiting power: the vehicle control unit calculates the sum of the discharge power of the bidirectional charger, the electric power used by the air conditioning system and the electric power used by the DCDC converter in real time, and limits the reduction of the sum of the discharge power of the bidirectional charger and the electric power used by the air conditioning system when the sum of the discharge power of the bidirectional charger and the electric power used by the DCDC converter is larger than the peak discharge power of the current power battery, and does not limit the continuous reduction of the sum of the discharge power of the bidirectional charger and the electric power used by the air conditioning system when the sum of the discharge power of the bidirectional charger and the electric power used by the air conditioning system is lower than the peak.
According to the discharge management method of the plug-in hybrid electric vehicle, after an external discharge request sent by a bidirectional charger is received, a vehicle control unit works and controls high voltage on the vehicle, namely, a power battery is respectively communicated with the bidirectional charger, an air conditioning system and a DCDC converter, then external equipment, the air conditioning system and the DCDC converter can be used for power utilization, the vehicle control unit judges whether the state of the power battery needs to start an engine for power supply after the high voltage is achieved, and the power battery is self-powered when the engine is not triggered for power supply.
When the power battery is independently powered, when the vehicle control unit calculates that the sum of the discharge power of the bidirectional charger, the electric power used by the air conditioning system and the electric power used by the DCDC converter is higher than the peak discharge power of the power battery, the vehicle control unit indicates that the maximum discharge power of the power battery at the moment is difficult to meet the power consumption requirements of power consumption elements of the bidirectional charger, the air conditioning system and the DCDC converter, the vehicle control unit limits the working power of the bidirectional charger and the air conditioning system according to a certain sequence, so that the sum of the discharge power of the bidirectional charger, the electric power used by the air conditioning system and the electric power used by the DCDC converter is reduced, the sum of the three is compared with the current peak discharge power of the power battery in real time after being reduced, the sum of the three is lower than the current peak discharge power of the power battery, the power battery protection, when the sum of the discharge power of the bidirectional charger and the electricity consumption power of the air conditioning system is limited to be reduced, the electricity consumption power of the DCDC converter is increased, when the output power of the DCDC converter meets the electricity consumption of the electric equipment in the vehicle, the sum of the discharge power of the bidirectional charger and the electricity consumption power of the air conditioning system is not continuously reduced, the storage battery cannot trigger the low-voltage power supply in the vehicle when the output power of the DCDC converter meets the electricity consumption of the electric equipment in the vehicle, therefore, the electricity of the storage battery cannot be consumed, the vehicle can be started again to run, and the situation that the vehicle cannot normally run easily when the vehicle discharges to the outside is avoided.
In the above discharging management method for the plug-in hybrid electric vehicle, in the step C, when the sum of the discharging power of the bidirectional charger and the electric power of the air conditioning system is limited, the vehicle controller obtains the current state of the air conditioning system through the air conditioning controller, when the air conditioning system thermally manages the interior of the vehicle, the vehicle controller firstly limits the reduction of the electric power of the air conditioning system, and when the electric power of the air conditioning system is limited to zero and the limitation is required to be continued, the vehicle controller limits the reduction of the discharging power of the bidirectional charger; when the air conditioning system conducts heat on the power battery, the vehicle control unit limits the reduction of the discharge power of the bidirectional charger firstly, and when the discharge power of the bidirectional charger is limited to be zero and the limitation needs to be continued, the vehicle control unit limits the reduction of the power consumption power of the air conditioning system. The power limiting sequence is determined through the operation, the power for the thermal management of the power battery is preferentially kept, when the power battery is not subjected to the thermal management, the power of the air conditioning system is limited firstly, when the sum of the discharge power of the bidirectional charger, the electricity utilization power of the air conditioning system and the electric power used by the DCDC converter is lower than the current peak discharge power of the power battery, and when the output power of the DCDC converter meets the electricity utilization of electric equipment in a vehicle, the discharge power of the current bidirectional charger is not limited and reduced, and when the output power of the DCDC converter does not meet the electricity utilization of the electric equipment in the vehicle, the discharge power of the bidirectional charger is. And otherwise, the bidirectional charging and discharging power is limited firstly, and the power consumption of the air conditioning system is limited when the limitation is needed. When one of the discharge power of the bidirectional charger and the electricity utilization power of the air conditioning system is limited, the sum of the discharge power of the bidirectional charger and the electricity utilization power of the air conditioning system is reduced.
In the above-mentioned discharge management method for the plug-in hybrid vehicle, in the step C, when the discharge power of the bidirectional charger and the electric power of the air conditioning system are both reduced to zero and the output power of the DCDC converter does not satisfy the power consumption of the electric equipment in the vehicle, the vehicle controller controls the power battery to be disconnected from the bidirectional charger, the air conditioning system and the DCDC converter respectively. The discharging power of the bidirectional charger and the electricity utilization power of the air conditioning system are limited to zero, and then the electricity utilization of the electric equipment in the vehicle is not met, so that the high voltage of the whole vehicle is enabled to wait for the vehicle to sleep, the electricity of the storage battery is stopped to be consumed after the vehicle is in sleep, and the problem that the vehicle is difficult to start is avoided.
In the above-mentioned discharge management method for the plug-in hybrid vehicle, in the step C, the vehicle control unit acquires the voltage of the battery through the first voltage sensor, and when the vehicle control unit determines that the voltage of the battery is constant and not zero, it determines that the output power of the DCDC converter satisfies the power consumption of the electric equipment in the vehicle. The storage battery is connected in parallel to a current output port of the DCDC converter in the hybrid vehicle, when the output power of the DCDC converter does not meet the power consumption of the electric equipment in the vehicle, the output power of the DCDC converter is reduced, so that the storage battery starts to output voltage and current to supply power to the electric equipment in the vehicle, when the output power of the DCDC converter meets the requirement, the storage battery supplies power to the electric equipment in the vehicle and supplies power to the electric equipment in the vehicle, namely when the voltage of the storage battery is not fed and the voltage is kept constant, the output power of the DCDC converter meets the power consumption of the electric equipment.
In the above discharging management method for the plug-in hybrid vehicle, in the step B, the power battery state includes the voltage, the peak discharging power and the electric quantity of the power battery, and when the voltage, the peak discharging power and the electric quantity are all greater than the corresponding discharging preset values, it is determined that the triggering of the engine for power supply is not satisfied, and the step C is entered; and C, when at least one of the voltage, the peak discharge power and the electric quantity of the power battery is lower than a corresponding discharge preset value, the vehicle control unit controls the engine to drive the motor to output direct current to charge the power battery and supply power to the air conditioning system, the DCDC converter and the bidirectional charger, after the power battery state meets the condition that the engine stops supplying power, the vehicle control unit controls the engine to stop, the power battery is self-powered independently, the step C is carried out, and the step C is not carried out when the engine drives the motor to output direct current. The electric quantity of the power battery is considered, and the peak discharge power and the voltage are also considered for the state of the power battery, so that the electric quantity is not considered independently, and when the electric quantity is higher, the voltage and the peak discharge power are reduced, so that the functions of the power battery and the bidirectional charger are unavailable. And triggering the engine to supply power as long as one of the voltage, the peak discharge power and the electric quantity is lower than a preset discharge value, so that the vehicle discharge operation is ensured to be performed under a safe condition.
In the above-mentioned discharge management method for a plug-in hybrid vehicle, in the step C, the vehicle control unit is provided with a maximum discharge power allowed for the bidirectional charger, a maximum power consumption power of the DCDC converter, and a maximum power consumption power of the air conditioning system, and when the vehicle control unit determines that the current peak discharge power of the power battery is greater than a certain value of the sum of the maximum discharge power of the bidirectional charger, the maximum power consumption power of the DCDC converter, and the maximum power consumption power of the air conditioning system, or when the engine supplies power, the vehicle control unit gradually removes the power limit in a reverse order of limiting the discharge power of the bidirectional charger and the reduction of the power consumption power of the air conditioning system. When the vehicle generates power for external equipment, when discharge occurs in the bidirectional charger, the DCDC converter and the air conditioning system or the power of the electricity is larger than the corresponding maximum allowable power, the vehicle controller limits an object exceeding the maximum allowable power to reduce the electricity or discharge power until the electricity or discharge power is reduced to be within the maximum allowable power (including the maximum allowable power), that is, the bidirectional charger, the DCDC converter and the air conditioning system basically work in the maximum allowable power. When the peak power of the power battery is increased and is larger than the maximum allowable power of the bidirectional charger, the DCDC converter and the air conditioning system by a certain value, the power battery can meet the power consumption requirements of the current bidirectional charger, the current DCDC converter and the air conditioning system, and the power battery can also meet the power consumption requirements of the bidirectional charger, the current DCDC converter and the air conditioning system after the power battery is supplied by the engine.
In the discharge management method of the plug-in hybrid electric vehicle, the vehicle control unit is preset with an engine power generation power meter corresponding to the sum of the discharge power of the bidirectional charger, the electric power for the air conditioning system and the electric power for the DCDC converter, the vehicle control unit obtains the discharge power of the bidirectional charger, the electric power for the air conditioning system and the electric power for the DCDC converter in real time and calculates the sum of the discharge power, the electric power for the air conditioning system and the electric power for the DCDC converter when the engine is started to operate for power supply, the power generation power meter is checked according to the sum of the discharge power, the corresponding power generation power. Through the operation, the engine generates electricity with the corresponding generated power, and energy waste caused by the adoption of excessive starting power of the engine is avoided.
A discharge management system of a plug-in hybrid electric vehicle comprises a vehicle control unit, a relay unit, a battery controller connected with the relay unit, an air conditioner controller capable of limiting the power consumption of the air conditioner system and a charge and discharge controller capable of limiting the discharge power of a bidirectional charger, and is characterized in that the charge and discharge controller, the battery controller and the air conditioner controller are respectively connected with the vehicle control unit, the vehicle control unit is also connected with a detection unit, when the vehicle control unit receives a power consumption request sent by the charge and discharge controller, the battery controller is controlled to enable the relay unit to supply high voltage on the vehicle, and when a power battery is selected to supply power by a signal sent by the battery controller, the vehicle control unit calculates the sum of the discharge power of the bidirectional charger, the power consumption of the air conditioner system and the electric power for a DCDC converter according to the signal sent by the detection unit, and when the sum is larger than the peak, and in the limiting process, when the sum of the discharge power of the bidirectional charger and the electric power of the air conditioning system is lower than the current peak discharge power of the power battery and the output power of the DCDC converter is judged to meet the power utilization requirement of the electric equipment in the vehicle according to the signal of the detection unit, the sum of the discharge power of the bidirectional charger and the electric power of the air conditioning system is not limited to be continuously reduced.
In the discharge management system of the plug-in hybrid vehicle, a charge-discharge controller of a bidirectional charger triggers and outputs an external discharge request after the discharge is inserted, a vehicle control unit triggers after receiving the signal and outputs a control signal to a battery controller of a battery management system, the battery controller controls a relay unit to be closed, so that a high voltage on the vehicle is that a power battery is communicated with the bidirectional charger, an air conditioning system and a DCDC converter respectively, then external equipment, the air conditioning system and the DCDC converter can be powered, then the state of the power battery is judged by the signal sent by the battery controller to obtain whether the power battery is powered independently, and when the power battery is powered independently, the vehicle control unit calculates the sum of the current discharge power of the bidirectional charger, the power used by the air conditioning system and the power used by the DCDC converter according to the signal sent by a detection unit and compares the sum with the peak discharge power of the current power battery sent by the battery controller.
When the sum of the discharge power of the bidirectional charger, the electric power for the air conditioning system and the electric power for the DCDC converter is higher than the peak discharge power of the power battery, the maximum discharge power of the power battery at the moment is difficult to meet the power consumption requirements of power consumption elements of the bidirectional charger, the air conditioning system and the DCDC converter, but the trigger charging working condition of the engine is not met at the moment, the vehicle control unit limits the working power of the bidirectional charger and the air conditioning system according to a certain sequence, so that the sum of the discharge power of the bidirectional charger, the electric power for the air conditioning system and the electric power for the DCDC converter is reduced, the sum of the discharge power of the bidirectional charger, the electric power for the air conditioning system and the electric power for the DCDC converter is lower than the current peak discharge power of the power battery, the power battery protection of the battery management system cannot be triggered, the bidirectional vehicle-, make DCDC converter power consumption rise, when DCDC converter output meets the interior consumer power consumption of car, keep current power restriction, satisfy the interior consumer power consumption of car by DCDC converter output, the battery can not trigger the inside low pressure power supply of car, therefore the electricity of battery can not consumed, then makes the vehicle can the restart operation again.
In the discharge management system of the plug-in hybrid electric vehicle, the vehicle control unit acquires the state of the power battery from a signal sent by the battery controller, the state of the power battery comprises the voltage, the peak discharge power and the electric quantity of the power battery, the vehicle control unit is connected with the engine controller and the motor controller, when at least one of the voltage, the peak discharge power and the electric quantity of the power battery is lower than a corresponding discharge preset value, the vehicle control unit sends a control signal to the engine controller to control the engine to act, sends the control signal to the motor controller to control the motor to output torque, and controls the engine to stop when the state of the power battery meets the condition that the engine stops supplying power. According to the vehicle control unit, when the power battery is not enough to supply power alone, the engine drives the motor to output direct current to charge the power battery and supply power to the air conditioning system, the DCDC converter and the bidirectional charger through the engine controller and the motor controller.
In the above-mentioned discharge management system for a plug-in hybrid vehicle, the detection unit includes a first voltage sensor for acquiring a voltage of the storage battery, a second voltage sensor for detecting a voltage of the air conditioning system, a second current sensor for detecting a current of the air conditioning system, a third voltage sensor for detecting a discharge voltage of the bidirectional charger, a third current sensor for detecting a discharge current of the bidirectional charger, a fourth voltage sensor for detecting a voltage of the DCDC converter, and a fourth current sensor for detecting a discharge current of the DCDC converter. The devices of the detection unit send detected signals to the vehicle control unit, the vehicle control unit calculates and obtains the power consumption of the air conditioning system, the discharge power of the bidirectional charger and the electric power for the DCDC converter, and the voltage sensor detects whether the output power of the DCDC converter meets the power consumption of electric equipment in the vehicle.
Compared with the prior art, the discharge management method and the system of the plug-in hybrid electric vehicle have the following advantages:
1. the invention can consider the current power consumption of each power consumption element and the peak discharge power of the power battery when the power battery is independently powered, and can limit the working power of the bidirectional charger and the air conditioning system, so that the power battery protection of the battery management system can not be triggered when the vehicle discharges to the outside, thereby ensuring that the functions of the power battery and the bidirectional vehicle-mounted charger are continuously available.
2. The power battery is self-powered and does not limit the electric power for the DCDC converter when power limitation is needed, and the power limitation is also used for keeping the output power of the DCDC converter to meet the power consumption of electric equipment in a vehicle, so that the electricity of the storage battery is not consumed, the vehicle can be started again to run, and the discharge work of the vehicle is ensured to be carried out under a safe condition.
Drawings
FIG. 1 is a schematic diagram of the main flow of the process of the present invention.
Fig. 2 is a schematic diagram of the connection between the battery management system, the power battery, the bidirectional charger, the air conditioning system, the DCDC converter, the engine and the motor in the invention.
Fig. 3 is a schematic diagram of the system connection structure of the present invention.
In the figure, 1, a vehicle control unit; 2. a power battery; 3. a battery management system; 3a, a battery controller; 4. a bidirectional charger; 4a, a charge-discharge controller; 5. an air conditioning system; 5a, an air conditioner controller; 6. a DCDC converter; 7. a detection unit; 7a, a first voltage sensor; 8. a storage battery; 9. an engine controller; 10. a motor controller; 11. a main positive relay; 12. a main negative relay; 13. a charge and discharge relay; 14. an engine; 15. a motor; 16. starting the system without a key; 17. a temperature sensor.
Detailed Description
The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, 2 and 3, a discharge management method of a plug-in hybrid vehicle includes the steps of:
step A, high pressure on the whole vehicle: the vehicle control unit 1 receives the discharging request, and controls the power battery 2 to be communicated with the bidirectional charger 4, the air conditioning system 5 and the DCDC converter 6 respectively. After the electric robbery is inserted, the vehicle control unit 1 receives a discharge request, which indicates that the discharge is needed to be carried out on the outside, the vehicle control unit 1 controls the high voltage on the vehicle to communicate the power battery 2 with the bidirectional charger 4, and when the external electric equipment is inserted to run after the electric robbery is inserted, the bidirectional charger 4 can carry out inversion to supply power to the external electric equipment; the power battery 2 is communicated with the air conditioning system 5, so that the air conditioning system 5 can be powered to operate when operating; the power battery 2 is communicated with the DCDC converter 6, and the DCDC converter 6 can convert high-voltage direct current of the power battery 2 into low-voltage direct current to supply power to electric equipment in the vehicle, wherein the electric equipment in the vehicle comprises various controllers and low-voltage electric elements of the vehicle.
And B, selecting whether the power battery 2 supplies power: the vehicle control unit 1 acquires the state of the power battery 2 in real time through the battery management system 3, and selects the power battery 2 to supply power when the power supply condition of the trigger engine 14 is not met. The battery management system 3 is a management system of the power battery 2, which can acquire various states of the power battery 2 to judge and transmit to other controllers. The acquired state of the power battery 2 includes the voltage, the peak discharge power and the amount of electricity of the power battery 2. The peak discharge power refers to the maximum power that the power battery 2 can provide in the current state for a period of time, which is related to the charge of the power battery 2 and the temperature of the power battery 2. The battery management system 3 is provided with a power battery 2 peak power meter corresponding to different electric quantities and temperatures, and the power battery 2 peak power meter is obtained through working condition experiments and is the prior art. Therefore, the battery management system 3 can obtain the current peak discharge power of the power battery 2 according to the electric quantity and the temperature.
And when the voltage, the peak discharge power and the electric quantity are all larger than the corresponding discharge preset values, judging that the voltage, the peak discharge power and the electric quantity do not meet the requirement of triggering the engine 14 to supply power, and entering the step C. The range of the preset discharge value of the voltage of the power battery 2 is 280 volts to 320 volts, and the preset discharge value serving as the preferred voltage is 310 volts; the discharging preset value range corresponding to the peak discharging power of the power battery 2 is 8 kilowatts to 12 kilowatts, and the discharging preset value serving as the optimal peak discharging power is 10 kilowatts; the preset value of the discharge of the electric quantity of the power battery 2 ranges from 18% to 25% of the electric quantity of the rated power battery 2, and the preset value of the discharge as the preferred electric quantity ranges from 20% of the electric quantity of the rated power battery 2.
When at least one of the voltage, the peak discharge power and the electric quantity of the power battery 2 is lower than a corresponding discharge preset value, the vehicle control unit 1 controls the motor 14 to drive the motor 15 to output direct current to charge the power battery 2 and supply power to the air conditioning system 5, the DCDC converter 6 and the bidirectional charger 4, after the state of the power battery 2 meets the condition that the motor 14 stops supplying power, the vehicle control unit 1 controls the motor 14 to stop, the power battery 2 independently supplies power to enter the step C, and when the motor 14 drives the motor 15 to output direct current, the step C is not started. The engine 14 power supply stop conditions are three, and the engine 14 stops power supply when any one of the conditions is satisfied. Under the condition one, when the electric quantity is greater than a first fixed value and the peak discharge power of the power battery 2 is greater than a second fixed value, the engine 14 stops supplying power, wherein the first fixed value is greater than the discharge preset value of the electric quantity, the range of the first fixed value is 35% to 45% of the electric quantity of the rated power battery 2, the first fixed value is 40% of the electric quantity of the rated power battery 2 as an optimal first fixed value, the range of the discharge preset value of the second fixed value which is greater than the peak discharge power is 18 kilowatts to 22 kilowatts, and the range of the discharge preset; under the second condition, the engine 14 stops supplying power when the electric quantity is greater than the third fixed value, the third fixed value is greater than the second fixed value and ranges from 65% to 75% of the electric quantity of the rated power battery 2, and the third fixed value is preferably 70% of the electric quantity of the rated power battery 2; and under the third condition, the power supply of the engine 14 is stopped when the voltage is greater than the fixed value, the fixed value is greater than the preset discharge value of the voltage and ranges from 370 volts to 390 volts, and the preferred fixed value is 380 volts. The discharge preset value, the fixed value from one to four can be calibrated according to actual conditions.
The vehicle control unit 1 is provided with an engine 14 power generation power meter corresponding to the sum of the discharge power of the bidirectional charger 4, the power consumption of the air conditioning system 5 and the power consumption of the DCDC converter 6 in advance, when the engine 14 is started to operate for power supply, the vehicle control unit 1 obtains the discharge power of the bidirectional charger 4, the power consumption of the air conditioning system 5 and the power consumption of the DCDC converter 6 in real time, calculates the sum of the three, checks the power generation power meter according to the sum of the three to obtain corresponding power generation power, and controls the engine 14 to generate power according to the power generation power obtained by the power generation power meter. By operating as described above, the engine 14 generates power with the corresponding generated power, and energy waste caused by using excessive engine power by the engine 14 is avoided. Preferably, when the discharge power of the bidirectional charger 4, the electric power of the air conditioning system 5 and the electric power of the DCDC converter 6 are calculated, and the sum of the three is more than 5 kilowatts for 10 seconds, controlling the power generation power of the engine 14 to be 8 kilowatts; and when the sum of the discharge power of the bidirectional charger 4, the electric power of the air conditioning system 5 and the electric power of the DCDC converter 6 is less than 4.5 kilowatts for 10 seconds, controlling the power generation of the engine 14 to be 6.5 kilowatts.
Step C, limiting power: the vehicle control unit 1 calculates the sum of the discharge power of the bidirectional charger 4, the power consumption of the air conditioning system 5 and the power consumption of the DCDC converter 6 in real time, and when the sum is larger than the peak discharge power of the current power battery 2, the sum of the discharge power of the bidirectional charger 4 and the power consumption of the air conditioning system 5 is limited to be reduced, and when the sum is lower than the peak discharge power of the current power battery 2 and the output power of the DCDC converter 6 meets the power consumption of the electric equipment in the vehicle, the sum of the discharge power of the bidirectional charger 4 and the power consumption of the air conditioning system 5 is not limited to be continuously reduced. When the power battery 2 alone supplies power, that is, when the engine 14 does not operate to supply power, it is determined whether or not to limit the power. After the vehicle is on high voltage, the bidirectional charger 4, the air conditioning system 5 and the DCDC converter 6 can consume power by electricity. And when the vehicle control unit 1 calculates that the sum of the discharge power of the bidirectional charger 4, the power consumption of the air conditioning system 5 and the power consumption of the DCDC converter 6 is lower than the peak discharge power of the power battery 2, the power battery normally supplies power to work.
When the vehicle control unit 1 calculates that the sum of the discharge power of the bidirectional charger 4, the power consumption of the air conditioning system 5 and the power consumption of the DCDC converter 6 is higher than the peak discharge power of the power battery 2, it indicates that the maximum discharge power of the power battery 2 at the moment is difficult to meet the power consumption requirements of the power consumption elements of the bidirectional charger 4, the air conditioning system 5 and the DCDC converter 6, and power limitation is required. The power limitation only limits the discharge power of the bidirectional charger 4 and/or the electricity consumption power of the air conditioning system 5, so that the sum of the power consumption of the bidirectional charger 4, the air conditioning system 5 and the DCDC converter 6 is reduced, and because the bidirectional charger 4, the air conditioning system 5 and the DCDC converter 6 are all powered by the power battery 2, after the discharge power of the bidirectional charger 4 and/or the electricity consumption power of the air conditioning system 5 are limited, the electricity consumption power of the DCDC converter 6 can be increased. The specific limiting process of this embodiment is as follows:
when the sum of the discharge power of the bidirectional charger 4 and the power consumption of the air conditioning system 5 needs to be limited, the vehicle control unit 1 acquires the current state of the air conditioning system 5 through the air conditioning controller 5a, when the air conditioning system 5 is used for carrying out thermal management on the interior of a vehicle, the vehicle control unit 1 firstly limits the reduction of the power consumption of the air conditioning system 5, the limiting reduction rate can be calibrated according to the actual situation, the reduction rate of 0.1 kilowatt/0.1 second is adopted in the embodiment, when the reduction of the power consumption of the air conditioning system 5 meets the requirement that the sum of the discharge power of the bidirectional charger 4, the power consumption of the air conditioning system 5 and the power consumption of the DCDC converter 6 is lower than the current peak discharge power of the power battery 2, when the output power of the DCDC converter 6 meets the power consumption of the electric equipment in the vehicle, the power consumption of the air conditioning system 5 does not need to be continuously reduced, the vehicle control unit 1 limits the discharge power of the bidirectional charger 4 to be reduced at a certain rate until the sum of the discharge power of the bidirectional charger 4, the electric power of the air conditioning system 5 and the electric power of the DCDC converter 6 is lower than the current peak discharge power of the power battery 2, and the output power of the DCDC converter 6 meets the power consumption of the electric equipment in the vehicle. This rate may also be calibrated, with the present embodiment employing a rate reduction of 0.1 kilowatts per 0.1 second.
When the air conditioning system 5 conducts heat management on the power battery 2, the vehicle control unit 1 firstly limits the discharge power of the bidirectional charger 4 to be reduced at a rate of 0.1 kilowatt/0.1 second, and when the discharge power of the bidirectional charger 4 is limited to be zero and the limitation is needed, the vehicle control unit 1 limits the power consumption of the air conditioning system 5 to be reduced at a rate of 0.1 kilowatt/0.1 second until the sum of the discharge power of the bidirectional charger 4, the power consumption of the air conditioning system 5 and the power consumption of the DCDC converter 6 is lower than the current peak discharge power of the power battery 2, and the output power of the DCDC converter 6 meets the power consumption of power consumption equipment in the vehicle. The power limiting sequence is determined through the operation, the power for the thermal management of the power battery 2 is preferentially kept, when the power battery 2 is not thermally managed, the power of the air conditioning system 5 is limited, otherwise, the bidirectional charging and discharging power is limited.
When the air conditioning system 5 does not work with electricity, the vehicle control unit 1 only limits the discharge power of the bidirectional charger 4. When the discharging power of the bidirectional charger 4 and the electricity consumption power of the air conditioning system 5 are both reduced to zero and the output power of the DCDC converter 6 does not meet the electricity consumption of the electric equipment in the vehicle, the vehicle controller 1 controls the power battery 2 to be disconnected with the bidirectional charger 4, the air conditioning system 5 and the DCDC converter 6 respectively, namely, the lower high voltage. The discharging power of the bidirectional charger 4 and the electricity utilization power of the air conditioning system 5 are limited to zero, and then the electricity utilization of the electric equipment in the vehicle is not met, so that the whole vehicle is under high voltage, after the high voltage is reduced, each controller in the vehicle prepares to sleep and works according to the existing direct network management protocol, after each controller is in sleep, the whole vehicle is powered off and does not work, namely, the electric quantity of the storage battery 8 is stopped to be consumed after the vehicle is in sleep, and the problem that the vehicle is difficult to start is avoided. After the discharge power of the bidirectional charger 4 is limited to be zero for a period of time, the vehicle controller 1 also controls the high voltage under the vehicle, the time range is one minute to two minutes, preferably one minute, and as the discharge power of the bidirectional charger 4 is limited to be zero for one minute, the time is long, and the normal circuit cannot have the long limiting time, the problem possibly exists in the discharge circuit, the high voltage under the vehicle is controlled, and the vehicle is protected.
Whether the output power of the DCDC converter 6 meets the power consumption of the electric equipment in the vehicle is judged by the vehicle control unit 1, the vehicle control unit 1 acquires the voltage of the storage battery 8 through the voltage sensor I7 a, and when the vehicle control unit 1 judges that the voltage of the storage battery 8 is constant and not zero, the output power of the DCDC converter 6 meets the power consumption of the electric equipment in the vehicle. In the hybrid vehicle, the storage battery 8 is connected in parallel to a current output port of the DCDC converter 6, when the output power of the DCDC converter 6 does not satisfy the power consumption of the electric equipment in the vehicle, the output power of the DCDC converter 6 is reduced, so that the storage battery 8 starts to output voltage and current to supply power to the electric equipment in the vehicle, when the output power of the DCDC converter 6 satisfies, the storage battery 8 is supplied with power and the electric equipment in the vehicle is supplied with power, that is, when the voltage of the storage battery 8 is not fed, and when the voltage is kept constant, the output power of the DCDC converter 6 satisfies the power consumption of the electric equipment in.
When the vehicle control unit 1 judges that the current peak discharge power of the power battery 2 is larger than the sum of the maximum discharge power of the bidirectional charger 4, the maximum power consumption power of the DCDC converter 6 and the maximum power consumption power of the air conditioning system 5 by a certain value or when the engine 14 supplies power, the vehicle control unit 1 gradually removes the power limitation according to the reverse sequence of limiting the discharge power of the bidirectional charger 4 and the power consumption power of the air conditioning system 5. Namely, when the limiting sequence is that the electric power consumption of the air conditioning system 5 is limited firstly and then the discharge power of the bidirectional charger 4 is limited, the limiting power is removed, the power limitation of the discharge power of the bidirectional charger 4 is removed firstly, and then the power limitation of the electric power consumption of the air conditioning system 5 is removed; the limiting sequence is that when the discharging power of the bidirectional charger 4 is limited firstly and then the power consumption of the air conditioning system 5 is limited, the power limitation of the power consumption of the air conditioning system 5 is removed firstly when the limiting power is removed, and then the power limitation of the discharging power of the bidirectional charger 4 is removed. When only one of the electric power used by the air conditioning system 5 and the discharge power of the bidirectional charger 4 is limited, the limitation-free power is released only from the limited object. The limitation removing is to recover the power utilization, the power removing is realized according to a certain speed, the speed for removing the power limitation can be calibrated, and the power limitation is gradually removed at the speed of 0.1 kilowatt/0.1 second in the embodiment. And re-entering the step A after the limitation is removed.
The power limitation and the power limitation removal are both carried out according to a certain reduction rate or increase rate, and the reduction rate or the increase rate of 0.1 kilowatt/0.1 second can avoid the problems that the reduction rate or the increase rate is too high, the power conversion of the electric equipment is too high, and the electronic device receives too large impact to damage the electric equipment.
The vehicle control unit 1 is provided with the maximum discharge power of the bidirectional charger 4, the maximum power consumption of the DCDC converter 6 and the maximum power consumption of the air conditioning system 5. The maximum discharge power of the bidirectional charger 4 is selected from the range of 0 to 3.3 kilowatts, the maximum power consumption of the DCDC converter 6 is selected from the range of 0 to 3 kilowatts, and the maximum power consumption of the air conditioning system 5 is selected from the range of 0 to 6.8 kilowatts. When the vehicle generates power for the external device, when discharge occurs in the bidirectional charger 4, the DCDC converter 6 and the air conditioning system 5 or the power of the power consumption is greater than the corresponding maximum allowable power, the vehicle control unit 1 limits the object exceeding the maximum allowable power to reduce the power consumption or the discharge power until the power is reduced to be within the maximum allowable power (including the maximum allowable power), that is, the bidirectional charger 4, the DCDC converter 6 and the air conditioning system 5 basically operate in the maximum allowable power. When the peak power of the power battery 2 is increased and is larger than the maximum allowable power of the bidirectional charger 4, the DCDC converter 6 and the air conditioning system 5 by a certain value, the power battery 2 can meet the current power consumption requirements of the bidirectional charger 4, the DCDC converter 6 and the air conditioning system 5, and similarly, the power battery 14 can also meet the power consumption requirements of the bidirectional charger 4, the DCDC converter 6 and the air conditioning system 5 after supplying power, at the moment, the power limitation is gradually contacted, and the releasing sequence is opposite to the limiting sequence. The above-mentioned specific value ranges from 1 kilowatt to 3 kilowatts, preferably 2 kilowatts.
When the limitation of the power consumption of the air conditioning system 5 is released, the current power requested by the air conditioning system 5 and the preset maximum power consumption of the air conditioning system 5, which are sent by the air conditioning controller 5a, are compared, and the smaller value is selected as the target power recovered after the power is released. The air conditioner controller 5a is capable of acquiring the requested power required by the air conditioning system 5 in the related art. Similarly, when the power limit of the electric power used by the bidirectional charger 4 is released, the current requested power of the bidirectional charger 4 sent by the charge-discharge controller 4a is compared with the preset maximum discharge power of the bidirectional charger 4, and the smaller value is selected as the target power recovered after the power is released. Alternatively, when the power limit is released, the maximum power consumption of the air conditioning system 5 and the maximum discharge power of the bidirectional charger 4 are set as the recovery power targets, respectively.
After the vehicle controller 1 receives an external power utilization request, when the vehicle is judged not to be powered on, namely the power supply of the vehicle is in an OFF gear, the vehicle controller 1 wakes up the air conditioning system 5 through the LIN bus to carry out thermal management on the power battery 2, so that the power battery 2 is protected in the power generation process.
When the engine 14 needs to be started to drive the motor 15 to supply power, the vehicle control unit 1 judges whether the vehicle power supply is in an ON gear, then judges whether the engine 14 is in a starting state, when the power supply is in the ON gear and the engine 14 is in the starting state, the vehicle control unit 1 controls the motor 15 to work, the engine 14 drives the motor 15 to supply power, and when the power supply is in an ON gear and the engine 14 is in a flameout state, the vehicle control unit 1 controls the engine 14 to start and then controls the engine 14 to drive the motor 15 to supply power. When the power supply is in the OFF gear, the vehicle controller 1 firstly requests the vehicle power supply to be in the ON gear, and then controls the engine 14 to drive the motor 15 to supply power. When the engine 14 generates electricity to supply power, the fuel quantity is detected through the fuel quantity sensor in real time, when the fuel quantity is lower than the fuel quantity threshold value, the whole vehicle controller 1 stops the engine 14 to start, controls the high pressure under the whole vehicle and enters a dormant state, and therefore the problem that the vehicle cannot run again due to too little fuel quantity is avoided.
The vehicle control unit 1 monitors the electric quantity of the power battery 2 in real time in the discharging process, and when the electric quantity of the power battery 2 is lower than the lowest limit value, the vehicle control unit 1 controls the high voltage under the vehicle to enable the vehicle to enter a dormant state. When the power battery 2 is lower than the lowest lower limit value, the discharge circuit is indicated to generate faults, and external discharge is avoided through high voltage under the whole vehicle, so that the battery is protected, and the vehicle is protected.
According to the discharge management method of the plug-in hybrid vehicle, when the maximum discharge power of the power battery 2 is difficult to meet the power consumption requirements of power consumption elements such as the bidirectional charger 4, the air conditioning system 5 and the DCDC converter 6, the vehicle control unit 1 limits the working power of the bidirectional charger 4 and the air conditioning system 5 according to a certain sequence, so that the sum of the discharge power of the bidirectional charger 4, the power consumption power of the air conditioning system 5 and the power consumption power of the DCDC converter 6 is reduced, the power battery 2 of the battery management system 3 cannot be triggered to protect if the sum of the discharge power of the bidirectional charger 4, the air conditioning system 5 and the power consumption power of the DCDC converter 6 is lower than the current peak discharge power of the. Meanwhile, when the sum of the discharge power of the bidirectional charger 4 and the electricity consumption power of the air conditioning system 5 is limited to be reduced, the electricity consumption power of the DCDC converter 6 is increased, when the output power of the DCDC converter 6 meets the electricity consumption of the electric equipment in the vehicle, the sum of the discharge power of the bidirectional charger 4 and the electricity consumption power of the air conditioning system 5 is not continuously reduced, when the output power of the DCDC converter 6 meets the electricity consumption of the electric equipment in the vehicle, the storage battery 8 cannot trigger the low-voltage power supply in the vehicle, so that the electricity of the storage battery 8 cannot be consumed, the vehicle can be started again to run, and the situation that the vehicle cannot normally run when the vehicle discharges to the outside is avoided.
As shown in fig. 2 and 3, the discharge management system for a plug-in hybrid vehicle applies the discharge management method for a plug-in hybrid vehicle. The management system comprises a vehicle control unit 1, a relay unit, a battery controller 3a which is connected with the relay unit and can send the state of a power battery 2, an air conditioner controller 5a which can limit the power consumption of an air conditioning system 5, and a charging and discharging controller 4a which can limit the discharging power of a bidirectional charger 4. The charging and discharging controller 4a, the battery controller 3a and the air conditioner controller 5a are respectively connected with the vehicle control unit 1 in two directions, and the vehicle control unit 1 is further connected with a detection unit 7.
The battery controller 3a is a controller of the battery management system 3, the air-conditioning controller 5a is a controller of the air-conditioning system 5, and the charge-discharge controller 4a is a controller of the bidirectional charger 4.
The relay unit comprises a main positive relay 11, a main negative relay 12 and a charge and discharge relay 13, one end of a normally open switch of the charge and discharge relay 13 is connected with the positive electrode of the power battery 2, the other end of the normally open switch is connected with the positive electrode of the bidirectional charger 4, and a coil of the charge and discharge relay 13 is connected with the output end of the battery controller 3 a; one end of a normally open switch of the main positive relay 11 is connected with the positive electrode of the power battery 2, the other end of the normally open switch is connected with the positive electrode of the power supply of the air conditioning system 5 and the positive electrode of the power supply of the DCDC converter 6, and a coil of the main positive relay 11 is connected with the output end of the battery controller 3 a; one end of a normally open switch of the main negative relay 12 is connected with the negative electrode of the power battery 2, the other end of the normally open switch is connected with the power supply negative electrode of the air conditioning system 5, the negative electrode of the bidirectional charger 4 and the power supply negative electrode of the DCDC converter 6, and a coil of the main negative relay 12 is connected with the output end of the battery controller 3 a.
The detection unit 7 comprises a first voltage sensor 7a for acquiring the voltage of the storage battery 8, a second voltage sensor for detecting the electricity utilization voltage of the air conditioning system 5, a second current sensor for detecting the electricity utilization current of the air conditioning system 5, a third voltage sensor for detecting the discharge voltage of the bidirectional charger 4, a third current sensor for detecting the discharge current of the bidirectional charger 4, a fourth voltage sensor for detecting the electricity utilization voltage of the DCDC converter 6 and a fourth current sensor for detecting the discharge current of the DCDC converter 6. The devices of the detection unit 7 send detected signals to the vehicle control unit 1, and the vehicle control unit 1 calculates the power consumption of the air conditioning system 5, the discharge power of the bidirectional charger 4 and the power consumption of the DCDC converter 6.
The vehicle control unit 1 is connected with an engine controller 9 and a motor controller 10, and the vehicle control unit 1 is further connected with a keyless starting system 16 for transmitting the gear of the vehicle power supply. The input end of the battery controller 3a is connected with a temperature sensor 17. The input end of the vehicle control unit 1 can be connected with an oil quantity sensor.
In addition, in the vehicle, the positive electrode and the negative electrode of the power battery 2 are respectively connected with the battery management system 3, the voltage sensor and the current sensor in the battery management system 3 acquire the voltage and current related information of the power battery 2 and send the information to the battery controller 3a, the bidirectional charger 4 is used for inserting a discharging gun (the discharging gun is connected with the positive electrode and the negative electrode output end of the bidirectional charger 4 in fig. 2), the power output end of the DCDC converter 6 is used for connecting with the in-vehicle electric equipment to output electricity (the in-vehicle electric equipment is connected with the positive electrode and the negative electrode output end of the DCDC converter 6 in fig. 2), the positive electrode of the storage battery 8 is connected with the positive electrode of the power output end of the DCDC converter 6, and the negative electrode of the storage battery 8 is connected with. One end of the discharging gun is used for being inserted into the bidirectional charger 4, and the other end of the discharging gun is a socket used for being inserted into external electric equipment. The engine 14 can be connected with the motor 15, and the power supply output end of the motor 15 is respectively connected with the anode and the cathode of the power battery 2.
When the discharging gun is inserted into the bidirectional charger 4, the charging and discharging controller 4a of the bidirectional charger 4 triggers and sends an external power utilization request to the vehicle control unit 1, the vehicle control unit 1 controls high voltage on the vehicle, the vehicle control unit 1 sends a control signal to the battery controller 3a, and the battery controller 3a controls the main positive relay 11, the main negative relay 12 and the charging and discharging relay 13 to be closed, so that the power battery 2 is respectively communicated with the bidirectional charger 4, the air conditioning system 5 and the DCDC converter 6, and then the external equipment, the air conditioning system 5 and the DCDC converter 6 can be used for power utilization. After the high voltage is applied, the vehicle control unit 1 obtains the signal sent by the battery controller 3a to obtain the state of the power battery 2, where the state of the power battery 2 includes the voltage, the peak discharge power and the electric quantity of the power battery 2. The peak discharge power is obtained by the battery controller 3a through a table lookup according to the current electric quantity of the power battery 2 and the current temperature of the power battery 2 sent by the temperature sensor 17. When the power battery 2 is selected to supply power according to the current voltage, the peak discharge power and the electric quantity, the vehicle control unit 1 respectively calculates the discharge power of the bidirectional charger 4, the power consumption of the air conditioning system 5 and the power consumption of the DCDC converter 6 in real time according to the signals sent by the detection unit 7, obtains the sum of the three, and limits the reduction of the sum of the discharge power of the bidirectional charger 4 and the power consumption of the air conditioning system 5 when the sum of the three is larger than the current peak discharge power of the power battery 2, wherein the limiting control process is shown as a discharge management method of a plug-in hybrid vehicle, the limitation is realized by the charge and discharge controller 4a when the discharge power of the bidirectional charger 4 is limited, the charge and discharge controller 4a controls the on-off frequency of a power tube (such as an MOS tube) in the bidirectional charger 4 to limit or recover the discharge power of the bidirectional charger 4, and the charge and discharge, when the power consumption of the air conditioning system 5 is limited, the limitation is realized through the air conditioning controller 5a, the air conditioning controller 5a controls the on-off frequency of a power tube (such as an MOS tube) in a power circuit of the air conditioning system 5 to limit or recover the power consumption of the air conditioning system 5, and the air conditioning controller 5a realizes the power limitation of the bidirectional charger 4 in the prior art.
When the sum of the three is lower than the current peak discharge power of the power battery 2 (the current peak discharge power of the power battery 2 is dynamically changed when the value is obtained in real time, the sum of the three is calculated in real time and compared with the peak discharge power of the power battery 2 at the corresponding moment), and when the output power of the DCDC converter 6 is judged to meet the power utilization requirement of the electric equipment in the vehicle according to the signal of the voltage sensor I7 a, the sum of the discharge power of the bidirectional charger 4 and the power utilization of the air conditioning system 5 is not limited to be continuously reduced. And in the process of limiting the power or when the sum of the discharge power of the bidirectional charger 4 and the electric power of the air conditioning system 5 is not limited to be reduced continuously, the power limitation is removed when the condition that the power limitation needs to be removed is met.
When at least one of the voltage, the peak discharge power and the electric quantity of the power battery 2 is lower than a corresponding discharge preset value, the vehicle control unit 1 sends a control signal to the engine controller 9 to control the engine 14 to act, and sends the control signal to the motor controller 10 to control the motor 15 to output torque, and the engine 14 drives the motor 15 to output direct current to charge the power battery 2 and supply power to the bidirectional charger 4, the air conditioning system 5 and the DCDC converter 6. After the state of the power battery 2 meets the condition that the power supply of the engine 14 is stopped, the vehicle control unit 1 controls the engine 14 to stop.
When the engine 14 needs to be started to drive the motor 15 to supply power, the vehicle controller 1 judges whether the vehicle power supply is in an ON gear or not through a signal sent by the keyless start system 16, then judges whether the engine 14 is in a starting state or not through a signal sent by the engine controller 9, when the power supply is in the ON gear and the engine 14 is in the starting state, the vehicle controller 1 controls the motor 15 to work through the motor controller 10, the engine 14 drives the motor 15 to supply power, and when the power supply is in the ON gear and the engine 14 is in a flameout state, the vehicle controller 1 controls the engine 14 to start and then controls the engine 14 to drive the motor 15 to supply power through the engine controller 9. When the power supply is in the OFF gear, the vehicle controller 1 firstly requests the keyless start system 16 to enable the vehicle power supply to be in the ON gear, and then controls the engine 14 to drive the motor 15 to supply power after the vehicle power supply is in the ON gear. When the engine 14 generates electricity to supply power, the fuel quantity is detected through the fuel quantity sensor in real time, when the fuel quantity is lower than the fuel quantity threshold value, the whole vehicle controller 1 stops the engine 14 to start, controls the high pressure under the whole vehicle and enters a dormant state, and therefore the problem that the vehicle cannot run again due to too little fuel quantity is avoided.
In the discharge management system of the plug-in hybrid vehicle, through the air conditioner controller 5a and the charge-discharge controller 4a, when the sum of the discharge power of the bidirectional charger 4, the electric power of the air conditioning system 5 and the electric power of the DCDC converter 6 is lower than the peak discharge power of the power battery 2, the working power of the bidirectional charger 4 and the air conditioning system 5 is limited, so that the sum of the discharge power of the bidirectional charger 4, the electric power of the air conditioning system 5 and the electric power of the DCDC converter 6 is reduced, the power battery 2 protection of the battery management system 3 cannot be triggered when the sum of the three is lower than the current peak discharge power of the power battery 2, the functions of the power battery 2 and the bidirectional vehicle-mounted charger 15 continue to be available, the electric power of the DCDC converter 6 is not limited, when the sum of the discharge power of the bidirectional charger 4 and the electric power of the air conditioning system, make 6 power consumption of DCDC converter rise, when 6 output of DCDC converter satisfies the interior consumer power consumption of car, keep current power restriction, satisfy the interior consumer power consumption of car by 6 output of DCDC converter, battery 8 can not touch the inside low pressure power supply of car, therefore battery 8's electricity can not consumed, then make the vehicle can restart the operation again.
The specific embodiments described herein are merely illustrative of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although terms such as the vehicle control unit 1, the power battery 2, the battery management system 3, the battery controller 3a, the bidirectional charger 4, the charge and discharge controller 4a, the air conditioning system 5, the air conditioning controller 5a, the DCDC converter 6, the detection unit 7, the voltage sensor one 7a, the storage battery 8, the engine controller 9, the motor controller 10, the main positive relay 11, the main negative relay 12, the charge and discharge relay 13, the engine 14, the motor 15, the keyless start system 16, and the temperature sensor 17 are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims (9)

1. A discharge management method for a plug-in hybrid vehicle is characterized by comprising the following steps:
A. high pressure on the whole vehicle: the vehicle control unit (1) receives the discharge request and controls the power battery (2) to be communicated with the bidirectional charger (4), the air conditioning system (5) and the DCDC converter (6) respectively;
B. selecting whether the power battery (2) supplies power: the vehicle control unit (1) acquires the state of the power battery (2) in real time through the battery management system (3), and selects the power battery (2) to supply power when the condition that the trigger engine (14) supplies power is not met;
C. limiting power: the vehicle control unit (1) calculates the sum of the discharge power of the bidirectional charger (4), the electricity power of the air conditioning system (5) and the electricity power of the DCDC converter (6) in real time, when the sum of the discharge power of the bidirectional charger (4), the electricity power of the air conditioning system (5) and the electricity power of the DCDC converter (6) is larger than the peak discharge power of the current power battery (2), the sum of the discharge power of the bidirectional charger (4) and the electricity power of the air conditioning system (5) is limited to be reduced, when the sum of the discharge power of the bidirectional charger (4) and the electricity power of the air conditioning system (5) is lower than the peak discharge power of the current power battery (2) in the limiting process and the output power of the DCDC converter (6) meets the electricity power of the electric equipment in the vehicle, the sum of the discharge power of the bidirectional charger (4) and the electricity power of the air conditioning system (5) is not, The current supplies power to the electric equipment in the vehicle, the vehicle control unit (1) acquires the voltage of the storage battery (8) through the first voltage sensor (7a), and when the vehicle control unit (1) judges that the voltage of the storage battery (8) is constant and not zero, the output power of the DCDC converter (6) meets the requirement of the electric equipment in the vehicle.
2. The discharge management method of the plug-in hybrid vehicle according to claim 1, wherein in the step C, when the sum of the discharge power of the bidirectional charger (4) and the power consumption of the air conditioning system (5) is limited, the vehicle controller (1) obtains the current state of the air conditioning system (5) through the air conditioning controller (5a), when the air conditioning system (5) thermally manages the interior of the vehicle, the vehicle controller (1) firstly limits the reduction of the power consumption of the air conditioning system (5), and when the power consumption of the air conditioning system (5) is limited to zero and the limitation is further required, the vehicle controller (1) limits the reduction of the discharge power of the bidirectional charger (4); when the air conditioning system (5) conducts heat management on the power battery (2), the vehicle control unit (1) limits the reduction of the discharge power of the bidirectional charger (4) firstly, and when the discharge power of the bidirectional charger (4) is limited to be zero and the limitation needs to be continued, the vehicle control unit (1) limits the reduction of the electricity utilization power of the air conditioning system (5).
3. The method for managing discharge of a plug-in hybrid vehicle according to claim 2, wherein in the step C, the vehicle controller (1) controls the power battery (2) to be disconnected from the bidirectional charger (4), the air conditioning system (5) and the DCDC converter (6) respectively when the discharge power of the bidirectional charger (4) and the electric power of the air conditioning system (5) are both reduced to zero and the output power of the DCDC converter (6) does not satisfy the power consumption of the electric equipment in the vehicle.
4. The method for managing the discharge of the plug-in hybrid vehicle according to claim 1, wherein in the step B, the state of the power battery (2) comprises the voltage, the peak discharge power and the electric quantity of the power battery (2), and when the voltage, the peak discharge power and the electric quantity are all larger than the corresponding preset discharge values, the method determines that the triggering of the engine (14) for supplying power is not satisfied, and then the step C is entered; when at least one of the voltage, the peak discharge power and the electric quantity of the power battery (2) is lower than a corresponding discharge preset value, the vehicle control unit (1) controls the engine (14) to drive the motor (15) to output direct current to charge the power battery (2) and supply power to the air conditioning system (5), the DCDC converter (6) and the bidirectional charger (4), after the state of the power battery (2) meets the condition that the engine (14) stops supplying power, the vehicle control unit (1) controls the engine (14) to stop, the power battery (2) independently supplies power, the step C is carried out, and the step C is not carried out when the engine (14) drives the motor (15) to output direct current.
5. The discharge management method for the plug-in hybrid vehicle according to claim 4, wherein in the step C, the vehicle control unit (1) is configured to allow the maximum discharge power of the bidirectional charger (4), the maximum power consumption of the DCDC converter (6) and the maximum power consumption of the air conditioning system (5), and when the vehicle control unit (1) determines that the current peak discharge power of the power battery (2) is greater than a predetermined value of the sum of the maximum discharge power of the bidirectional charger (4), the maximum power consumption of the DCDC converter (6) and the maximum power consumption of the air conditioning system (5) or when the engine (14) supplies power, the vehicle control unit (1) gradually removes the power limitation in a reverse order of limiting the reduction of the discharge power of the bidirectional charger (4) and the power consumption of the air conditioning system (5).
6. The discharge management method for the plug-in hybrid vehicle according to claim 4, wherein an engine (14) power generation power meter corresponding to the sum of the discharge power of the bidirectional charger (4), the power consumption power of the air conditioning system (5) and the power consumption power of the DCDC converter (6) is preset in the vehicle control unit (1), the vehicle control unit (1) obtains the discharge power of the bidirectional charger (4), the power consumption power of the air conditioning system (5) and the power consumption power of the DCDC converter (6) in real time and calculates the sum of the discharge power of the bidirectional charger, the power consumption power of the air conditioning system (5) and the power consumption power of the DCDC converter (6) when the engine (14) is started to operate for power supply, the corresponding power generation power is obtained by checking the power generation power meter according to the sum.
7. A discharge management system of a plug-in hybrid electric vehicle comprises a vehicle control unit (1), a relay unit, a battery controller (3a) connected with the relay unit, an air conditioner controller (5a) capable of limiting the power consumption of the air conditioner system (5) and a charge-discharge controller (4a) capable of limiting the discharge power of a bidirectional charger (4), and is characterized in that the charge-discharge controller (4a), the battery controller (3a) and the air conditioner controller (5a) are respectively connected with the vehicle control unit (1), the vehicle control unit (1) is also connected with a detection unit (7), when the vehicle control unit (1) receives a power consumption request sent by the charge-discharge controller (4a), the battery controller (3a) is controlled to enable the relay unit to supply high voltage on the vehicle, and when a power battery (2) is selected by a signal sent by the battery controller (3a) to supply power, the vehicle control unit (1) calculates the sum of the discharge power of the bidirectional charger (4), the electricity power of the air conditioning system (5) and the electricity power of the DCDC converter (6) according to the signal sent by the detection unit (7), and when the sum of the three is larger than the peak discharge power of the current power battery (2), the sum of the discharge power of the bidirectional charger (4) and the electricity power of the air conditioning system (5) is limited to be reduced, the sum of the discharge power of the bidirectional charger (4) and the electricity power of the air conditioning system (5) is not limited to be reduced continuously when the output power of the DCDC converter (6) is judged to meet the electricity power consumption of the electric equipment in the vehicle according to the signal of the detection unit (7), the current output port of the DCDC converter (6) is connected with a storage battery (8) in parallel, when the output power of the DCDC converter (6) does not meet the electricity power consumption of the electric equipment in the vehicle, the storage battery (8) starts to output voltage and current to supply power for the electric equipment in the vehicle, the detection unit (7) comprises a first voltage sensor (7a) used for acquiring the voltage of the storage battery (8), the vehicle control unit (1) acquires the voltage of the storage battery (8) through the first voltage sensor (7a), and when the vehicle control unit (1) judges that the voltage of the storage battery (8) is kept constant and is not zero, the output power of the DCDC converter (6) is judged to meet the electric equipment in the vehicle.
8. The discharge management system of the plug-in hybrid vehicle according to claim 7, wherein the vehicle control unit (1) obtains the state of the power battery (2) from the signal sent by the battery controller (3a), the state of the power battery (2) comprises the voltage, the peak discharge power and the electric quantity of the power battery (2), the vehicle control unit (1) is connected with the engine controller (9) and the motor controller (10), when at least one of the voltage, the peak discharge power and the electric quantity of the power battery (2) is lower than the corresponding preset discharge value, the vehicle control unit (1) sends a control signal to the engine controller (9) to control the engine (14) to operate, and sends a control signal to the motor controller (10) to control the motor (15) to output the torque, after the state of the power battery (2) meets the condition that the engine (14) stops supplying power, the vehicle control unit (1) controls the engine (14) to stop.
9. The discharge management system of the plug-in hybrid vehicle according to claim 8, wherein the detection unit (7) includes a second voltage sensor for detecting a voltage of electricity used by the air conditioning system (5), a second current sensor for detecting a current of electricity used by the air conditioning system (5), a third voltage sensor for detecting a voltage of discharge of the bidirectional charger (4), a third current sensor for detecting a current of discharge of the bidirectional charger (4), a fourth voltage sensor for detecting a voltage of electricity used by the DCDC converter (6), and a fourth current sensor for detecting a current of discharge of the DCDC converter (6).
CN201910362631.0A 2019-04-30 2019-04-30 Discharge management method and system for plug-in hybrid electric vehicle Active CN110077278B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910362631.0A CN110077278B (en) 2019-04-30 2019-04-30 Discharge management method and system for plug-in hybrid electric vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910362631.0A CN110077278B (en) 2019-04-30 2019-04-30 Discharge management method and system for plug-in hybrid electric vehicle

Publications (2)

Publication Number Publication Date
CN110077278A CN110077278A (en) 2019-08-02
CN110077278B true CN110077278B (en) 2021-06-11

Family

ID=67418139

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910362631.0A Active CN110077278B (en) 2019-04-30 2019-04-30 Discharge management method and system for plug-in hybrid electric vehicle

Country Status (1)

Country Link
CN (1) CN110077278B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112622699A (en) * 2019-10-09 2021-04-09 北京新能源汽车股份有限公司 Charging control method and device for low-temperature charging of power battery and automobile
CN111252020B (en) * 2020-03-10 2021-06-18 长城汽车股份有限公司 Energy coordination control method and system and vehicle
CN111497655B (en) * 2020-04-01 2022-11-11 浙江吉利控股集团有限公司 Power determination method and device under charging working condition of electric automobile and automobile
CN111890985A (en) * 2020-06-30 2020-11-06 汉腾汽车有限公司 Method for adjusting available power of battery of electric vehicle
CN113968136B (en) * 2021-10-29 2023-11-10 华人运通(江苏)技术有限公司 Low-voltage energy control method, system, equipment and medium for electric automobile
CN116238476A (en) * 2021-12-07 2023-06-09 广州汽车集团股份有限公司 Vehicle system energy control method, device, controller, vehicle and medium
CN115195476B (en) * 2022-09-15 2023-01-13 盛瑞传动股份有限公司 Vehicle energy management method, device, equipment, readable storage medium and vehicle
CN115871465A (en) * 2023-01-18 2023-03-31 重庆赛力斯新能源汽车设计院有限公司 Whole vehicle storage battery feed early warning method, device, equipment and storage medium

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8299756B2 (en) * 2007-11-01 2012-10-30 General Electric Company System and method for battery control
CN102951025A (en) * 2012-11-22 2013-03-06 东南（福建）汽车工业有限公司 Automatic defense device for electric vehicle
KR20140079156A (en) * 2012-12-18 2014-06-26 현대자동차주식회사 Method and system for determining torque of motor of hybrid electric vehicle
KR102368304B1 (en) * 2015-01-27 2022-02-28 삼성에스디아이 주식회사 Battery pack, method for controlling and driving system of electro-mechanical apparatus having the same
CN106611886B (en) * 2015-10-26 2020-06-19 比亚迪股份有限公司 Discharging method and system of hybrid electric vehicle
CN106080231A (en) * 2016-06-13 2016-11-09 重庆长安汽车股份有限公司 A kind of automobile portable charging system, self-charging method and external charging method
CN108407625B (en) * 2017-02-10 2024-01-26 石家庄汉卓能源科技有限公司 Bidirectional charging and discharging system for new energy automobile
US10227067B2 (en) * 2017-03-30 2019-03-12 Ford Global Technologies, Llc HEV battery management for generating off-board power
CN107757401B (en) * 2017-09-25 2019-11-05 北京新能源汽车股份有限公司 Control method and device for working mode of vehicle-mounted bidirectional charger and electric vehicle
CN108032983A (en) * 2017-12-22 2018-05-15 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） A kind of hybrid power ship charge-discharge controller and method
CN108202642A (en) * 2018-03-22 2018-06-26 深圳市大地和电气股份有限公司 Electric vehicle integrated driving system based on two-way inversion charge and discharge
CN108382388B (en) * 2018-03-27 2020-03-31 吉利汽车研究院（宁波）有限公司 Vehicle-mounted charger charging and discharging control method and system and hybrid vehicle
CN108583346B (en) * 2018-05-30 2021-02-09 北京新能源汽车股份有限公司 Electric automobile, automobile-to-automobile charging method, device and equipment
CN109080461A (en) * 2018-07-06 2018-12-25 联合汽车电子有限公司 The distribution system and distribution method of automobile electrical power
CN109177805B (en) * 2018-07-24 2022-10-21 国网电动汽车服务有限公司 Charging and discharging control method and system for electric automobile
CN109017375B (en) * 2018-07-27 2021-04-27 重庆长安新能源汽车科技有限公司 Whole vehicle energy distribution method and system and electric vehicle

Also Published As

Publication number Publication date
CN110077278A (en) 2019-08-02

Similar Documents

Publication Publication Date Title
CN110077278B (en) Discharge management method and system for plug-in hybrid electric vehicle
CN107554335B (en) Vehicle-mounted power system and automobile
EP3744553A1 (en) Control system and method for discharge control of electric vehicle
CN106004331B (en) A kind of electric automobile air conditioner control system and control method
US8143843B2 (en) Electrically-driven vehicle and method for controlling charging of electrically-driven vehicle
KR101582577B1 (en) Electric vehicles and method for battery charging control thereof
KR101617292B1 (en) Electric vehicles and method for sub-battery charging control thereof
US9421867B2 (en) Electric vehicle
CN101528499B (en) Power supply device and vehicle provided with the same
CN108482154B (en) Electric automobile control system
CN111409502B (en) Hydrogen fuel cell automobile and motor energy management method thereof in low-temperature environment
CN101052544B (en) Battery control system for hybrid vehicle and method for controlling a hybrid vehicle battery
EP2439094A1 (en) Clutch control device of hybrid vehicle
CN101730965A (en) Electric vehicle
WO2012081104A1 (en) Vehicle control device and vehicle control method
KR20160119167A (en) Power-transfer control device
EP2610102A2 (en) Controller for vehicle and vehicle including the controller
JP5880394B2 (en) Vehicle power supply
CN108437815B (en) Control method for rapid warming of power battery
CN113103882A (en) Power distribution method and system based on extended range type automobile
CN105501157A (en) System and method for supplying power to air conditioner of electric vehicle
CN113352940A (en) Storage battery power supplementing method and system and vehicle
CN111252020B (en) Energy coordination control method and system and vehicle
KR20220027532A (en) Air conditioner without engine running for heating and cooling for truck
KR20210028991A (en) Method for controlling sub battery of electric vehicle

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant