CN111497680A - Control system and control method for power battery of hybrid vehicle - Google Patents

Control system and control method for power battery of hybrid vehicle Download PDF

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Publication number
CN111497680A
CN111497680A CN202010397790.7A CN202010397790A CN111497680A CN 111497680 A CN111497680 A CN 111497680A CN 202010397790 A CN202010397790 A CN 202010397790A CN 111497680 A CN111497680 A CN 111497680A
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soc
power battery
electric quantity
refer
charging
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CN111497680B (en
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刘庆勃
韦健林
林元则
孙昊
刘德春
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Zhejiang Geely Holding Group Co Ltd
Zhejiang Geely New Energy Commercial Vehicle Group Co Ltd
Geely Sichuan Commercial Vehicle Co Ltd
Jiangxi Geely New Energy Commercial Vehicle Co Ltd
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Zhejiang Geely Holding Group Co Ltd
Zhejiang Geely New Energy Commercial Vehicle Group Co Ltd
Geely Sichuan Commercial Vehicle Co Ltd
Jiangxi Geely New Energy Commercial Vehicle Co Ltd
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    • 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
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • 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

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

Abstract

The invention provides a control system and a control method for a power battery of a hybrid vehicle. Relates to the technical field of power batteries. The control system includes: the acquisition unit is used for acquiring the current position of the hybrid vehicle, the position of the charging pile and the residual electric quantity of the power battery in real time; the calculation unit is used for acquiring the required electric quantity of the hybrid power battery running from the current position to the charging pile position in the pure electric mode according to the current position and the charging pile position, and acquiring the target charging electric quantity of the power battery; the control unit is used for outputting a driving charging power target value when the target charging electric quantity is larger than zero; and the execution unit is used for coupling the driving charging power target value with the driving required power of the hybrid vehicle and then charging the power battery. The control system provided by the invention can improve the dynamic property of the hybrid vehicle.

Description

Control system and control method for power battery of hybrid vehicle
Technical Field
The invention relates to the field of power battery control, in particular to a control system and a control method for a power battery of a hybrid vehicle.
Background
The power system of the hybrid power vehicle is divided into two working modes of pure electric and hybrid electric, and the comprehensive use cost of the vehicle is lowest when the pure electric mode works. The current power battery control method of the hybrid vehicle generally comprises the steps of firstly driving in a pure electric mode after the vehicle starts, and charging the power battery by an engine after the electric quantity of the power battery is lower than a certain threshold value so as to maintain the normal driving of the vehicle.
However, in the prior art, the electric quantity of the power battery cannot be fully utilized only by the scheme of charging according to the electric quantity of the power battery, and after the electric quantity of the power battery is lower than a threshold value, the discharging capacity of the power battery is reduced, so that the dynamic property of the vehicle is relatively reduced, and the driving experience is influenced. And the power battery has low electric quantity, so that the voltage of the whole vehicle high-voltage network is low, the efficiency of high-voltage components is influenced, and the system efficiency is not improved.
Disclosure of Invention
An object of a first aspect of the invention is to provide a control system for a power battery of a hybrid vehicle that can improve the drivability of the hybrid vehicle.
It is a further object of the first aspect of the invention to provide a control system for a power battery of a hybrid vehicle that is available to reduce the cost of use for the user.
An object of a second aspect of the invention is to provide a control method for a power battery of a hybrid vehicle that can improve the drivability of the hybrid vehicle.
According to the first aspect described above, the present invention provides a control system for a power battery of a hybrid vehicle, comprising:
the acquisition unit is connected with the power battery and is used for acquiring the current position of the hybrid vehicle, the position of a charging pile and the residual electric quantity of the power battery in real time;
the calculation unit is connected with the acquisition unit and used for acquiring the required electric quantity of the hybrid power battery running from the current position to the charging pile position in a pure electric mode according to the current position and the charging pile position and acquiring the target charging electric quantity SOC of the power battery according to the required electric quantity and the residual electric quantityrefer；
A control unit connected with the calculation unit and used for controlling the target charging capacity SOCreferWhen the charge quantity is larger than zero, the target charge quantity SOC is obtainedreferConverting into driving charging power target value PChAnd the driving charging power target value PCh；
The execution unit is connected with the control unit and the power battery and is used for converting the driving charging power target value PChAnd coupling the power with the driving required power of the hybrid power vehicle, and then charging the power battery according to the coupling result.
Optionally, the acquisition unit is further used for acquiring the temperature of the power battery when the hybrid vehicle is started;
the calculation unit is also used for obtaining the lowest electric quantity SOC when the power battery reaches the ideal discharge depth according to the temperature of the power batteryLowChAnd according to the required electric quantity, the residual electric quantity and the lowest electric quantity SOCLowChObtaining the target charging capacity SOC of the power batteryrefer。
Optionally, the acquisition unit is further used for acquiring the current running speed v of the hybrid vehicle;
the calculation unit is also used for calculating the distance between the current position and the charging pile position in real time and obtaining the distance S of the previous preset momentreal-t0Distance S from the current timereal-t1；
The control system further comprises:
a judging unit connected with the calculating unit and the control unit and used for judging the current running speed v and the distance S of the previous preset momentreal-t0A distance S from the current timereal-t1Judging the running state of the hybrid vehicle and generating a return flag bit Hflag；
Wherein, if the distance S of the previous preset momentreal-t0A distance S less than the current timereal-t1And the current running speed v is greater than zero, the return flag bit HflagIs equal to zero;
if the distance S of the previous preset momentreal-t0A distance S greater than the current timereal-t1And the current running speed v is greater than zero, the return flag bit HflagEqual to one.
Optionally, the control unit is further configured to:
at the return flag bit HflagEqual to zero and the target charge capacity SOCreferOutputting a first control instruction when the output value is greater than zero;
the execution unit is also used for controlling the electric quantity of the power battery to be kept at [ SOC ] according to the first control instructionM2L，SOCM2H]Within the range of (1).
Optionally, the control unit is further configured to:
at the return flag bit HflagEqual to one and the target charging capacity SOCreferWhen the charge quantity is larger than zero, the target charge quantity SOC is obtainedreferSetting the float value SOCaddHAnd a lower floating value SOCaddLIf the target charging capacity SOC is not reachedreferAnd the floating value SOCaddHIs greater than or equal to SOCM2HIf so, the control unit outputs a second control instruction, and if the target charging capacity SOC isreferAnd said floating value SOCaddHIs less than SOCM2HIf so, outputting a third control instruction;
the execution unit is also used for controlling the electric quantity of the power battery to be kept at [ SOC ] according to the second control instructionM2L，SOCM2H]And controlling the electric quantity of the power battery to be kept at [ SOC ] according to the third control instructionrefer-SOCaddL，SOCrefer+SOCaddH]Within the range of (1).
According to the second aspect described above, the invention also provides a control method for a power battery of a hybrid vehicle, including:
acquiring the current position of the hybrid vehicle, the position of a charging pile and the residual electric quantity of the power battery in real time;
obtaining the required electric quantity of the hybrid power battery running from the current position to the charging pile position in a pure electric mode according to the current position and the charging pile position, and obtaining the target charging electric quantity SOC of the power battery according to the required electric quantity and the residual electric quantityrefer；
At the target charging capacity SOCreferWhen the charge quantity is larger than zero, the target charge quantity SOC is obtainedreferConverting into driving charging power target value PChAnd the driving charging power target value PCh；
The driving charging power target value P is obtainedChAnd coupling the power with the driving required power of the hybrid power vehicle, and then charging the power battery according to the coupling result.
Optionally, the target charging capacity SOC of the power battery is obtainedreferThe method also comprises the following steps:
collecting the temperature of the power battery when the hybrid vehicle is started;
obtaining the ideal depth of discharge of the power battery according to the temperature of the power batteryLowest electric quantity SOCLowChAnd according to the required electric quantity, the residual electric quantity and the lowest electric quantity SOCLowChObtaining the target charging capacity SOC of the power batteryrefer。
Optionally, the target charging capacity SOC of the power battery is obtainedreferThe method also comprises the following steps:
acquiring the current running speed v of the hybrid vehicle;
calculating the distance between the current position and the charging pile position in real time, and obtaining the distance S of the previous preset momentreal-t0Distance S from the current timereal-t1；
According to the current running speed v and the distance S of the previous preset momentreal-t0A distance S from the current timereal-t1Judging the running state of the hybrid vehicle and generating a return flag bit Hflag；
Wherein, if the distance S of the previous preset momentreal-t0A distance S less than the current timereal-t1And the current running speed v is greater than zero, the return flag bit HflagIs equal to zero;
if the distance S of the previous preset momentreal-t0A distance S greater than the current timereal-t1And the current running speed v is greater than zero, the return flag bit HflagEqual to one.
Optionally, charging the power battery further comprises:
at the return flag bit HflagEqual to zero and the target charge capacity SOCreferOutputting a first control instruction when the output value is greater than zero;
controlling the electric quantity of the power battery to be kept at [ SOC ] according to the first control instructionM2L，SOCM2H]Within the range of (1).
Optionally, charging the power battery further comprises:
at the return flag bit HflagEqual to one and the target charging capacity SOCreferWhen the voltage is more than zero, the target is chargedQuantity SOCreferSetting the float value SOCaddHAnd a lower floating value SOCaddLIf the target charging capacity SOC is not reachedreferAnd said floating value SOCaddHIs greater than or equal to SOCM2HIf so, the control unit outputs a second control instruction, and if the target charging capacity SOC isreferAnd said floating value SOCaddHIs less than SOCM2HIf so, outputting a third control instruction;
controlling the electric quantity of the power battery to be kept at [ SOC ] according to the second control instructionM2L，SOCM2H]Or controlling the electric quantity of the power battery to be kept in [ SOC ] according to the third control instructionrefer-SOCaddL，SOCrefer+SOCaddH]Within the range of (1).
The control system provided by the invention comprises a collecting unit, a calculating unit, a control unit and an executing unit. The acquisition unit is used for acquiring the current position of the hybrid vehicle, the charging pile position and the residual capacity of the power battery, wherein the current position of the hybrid vehicle can be identified through a positioning system of the vehicle, and the charging pile position can be selected by a driver as required and input into the control system. On the one hand, when a driver opens the hybrid electric vehicle, the position of the charging pile can be set, then the control system predicts whether the electric quantity of the power battery can meet the power consumption requirement of the current travel according to the current position, the position of the charging pile and the residual electric quantity of the power battery, and if the electric quantity cannot meet the power consumption requirement, the control system can carry out the power consumption requirement according to the target charging power value PChThe power battery is supplied with power in advance according to the driving power demand of the hybrid power vehicle, so that the working voltage of a high-voltage system of the hybrid power vehicle can be increased, the working efficiency of the power system is improved, and the dynamic property of the hybrid power vehicle can be further improved. The defect that the power battery is charged only when the electric quantity of the power battery is lower than the threshold value in the prior art is overcome. On the other hand, the control system can also acquire the current position of the hybrid vehicle and the residual electric quantity of the power battery in real time in the running process of the hybrid vehicle, and perform advanced power supplement on the power battery according to the real-time residual electric quantity of the power battery, for exampleThe problem that the power battery power is insufficient due to the fact that a driver changes a stroke can be solved, the flexibility of a control system is improved, and the fact that the power performance of the hybrid vehicle is insufficient due to information obtained when the hybrid vehicle is started is avoided.
Furthermore, when the required electric quantity of the hybrid power battery running from the current position to the charging pile position in the pure electric mode is obtained according to the current position and the charging pile position, the return flag bit H of the hybrid power vehicle needs to be consideredflagIf the flag bit H is returnedflagIf the required electric quantity is one, the required electric quantity is the electric quantity required when the hybrid power battery runs from the current position to the position of the charging pile in a pure electric mode, and if the required electric quantity returns to the mark bit HflagFor zero, the required electric quantity is twice of the electric quantity required when the hybrid power battery runs from the current position to the position of the charging pile in a pure electric mode. Thus, the combined return flag bit HflagThe method for calculating the required electric quantity of the power battery can not only improve the charging and discharging efficiency of the power battery, but also reduce the use cost of a user.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic configuration diagram of a control system for a power battery of a hybrid vehicle according to an embodiment of the invention;
fig. 2 is a block flow diagram of a control method for a power battery of a hybrid vehicle according to an embodiment of the invention.
Detailed Description
Fig. 1 is a schematic configuration diagram of a control system for a power battery of a hybrid vehicle according to an embodiment of the present invention. As shown in FIG. 1The control system for a power battery 50 for a hybrid vehicle provided by the present invention generally includes: an acquisition unit 10, a calculation unit 20, a control unit 30 and an execution unit 40. The acquisition unit 10 is connected with the power battery 50 and used for acquiring the current position of the hybrid vehicle, the position of the charging pile and the residual electric quantity of the power battery 50 in real time. The calculating unit 20 is connected to the acquiring unit 10, and is configured to obtain a required electric quantity of the hybrid battery 50 traveling from the current position to the charging pile position in the pure electric mode according to the current position and the charging pile position, and obtain a target charging electric quantity SOC of the hybrid battery 50 according to the required electric quantity and the remaining electric quantityrefer. The control unit 30 is connected to the calculation unit 20 for setting the target charge capacity SOCreferWhen the charge quantity is larger than zero, the target charge quantity SOCreferConverting into driving charging power target value PChTarget charging power value P of parallel vehicleCh. The execution unit 40 is connected with the control unit 30 and the power battery 50, and is used for converting the driving charging power target value PChThe power battery 50 is charged according to the coupling result.
The control system provided by the embodiment comprises an acquisition unit 10, a calculation unit 20, a control unit 30 and an execution unit 40. The acquisition unit 10 is used for acquiring the current position of the hybrid vehicle, the charging pile position and the residual capacity of the power battery 50, wherein the current position of the hybrid vehicle can be identified through a positioning system of the vehicle, and the charging pile position can be selected by a driver as required and input into a control system. On one hand, when the driver starts the hybrid electric vehicle, the position of the charging pile can be set, then the control system predicts whether the electric quantity of the power battery 50 can meet the electricity demand of the current journey according to the current position, the position of the charging pile and the residual electric quantity of the power battery 50, and if the electric quantity cannot meet the electricity demand of the current journey, the control system can start the hybrid electric vehicle according to the target charging power value PChAnd the running power required by the hybrid power vehicle supplements the power for the power battery 50 in advance, so that the working voltage of a high-voltage system of the hybrid power vehicle can be increased, the working efficiency of the power system is improved, and the dynamic property of the hybrid power vehicle can be further improved. Make up forThe prior art is insufficient to charge the power battery 50 only when the charge of the power battery 50 is lower than the threshold. On the other hand, the control system can also collect the current position of the hybrid vehicle and the residual capacity of the power battery 50 in real time in the running process of the hybrid vehicle, and can supplement the power battery 50 in advance according to the real-time residual capacity of the power battery 50, so that the problem that the electric quantity of the power battery 50 is insufficient due to the fact that a driver changes a stroke can be solved, the flexibility of the control system is improved, and the situation that the dynamic property of the hybrid vehicle is insufficient due to the information acquired when the hybrid vehicle is started is avoided.
Specifically, the control unit 30 is at the target charge capacity SOCreferWhen the current is more than zero, the driving charging flag bit Ch is also outputflagThe execution unit 40 receives and outputs the driving charging flag bit ChflagThen starting up, and then charging the running vehicle to a target value PChAnd coupling the power with the driving power demand of the hybrid vehicle, and finally charging the power battery 50 according to the coupling result.
In a preferred embodiment, the control system can cooperatively regulate and control the braking force battery 50 to perform ordered charging and discharging according to the residual capacity of the power battery 50, the current position of the hybrid vehicle and the charging pile position, the power battery 50 is supplemented with power in advance when the capacity of the power battery 50 is not enough for the current journey, the pure electric mode is adopted to drive when the capacity of the power battery 50 is enough, the power battery 50 is preferentially used for the hybrid vehicle on the premise that the power battery 50 does not discharge when the current journey is finished, and the capacity in the power battery 50 is fully utilized when the vehicle returns to the charging pile position, so that the efficiency of a power system is improved, and the utilization rate of the charging and energy storage of a power grid is improved.
With continued reference to FIG. 1, in one particular embodiment, the control system further includes a navigation unit 70, and the navigation unit 70 may further include a human-machine interface and a navigation controller. When the hybrid vehicle is started, the navigation unit 70 automatically locates the current position of the hybrid vehicle, the driver selects the charging pile position in the navigation unit 70 through a human-computer interaction interface, and then the navigation controller sends the current position and the charging pile position to the acquisition unit 10, or the acquisition unit 10 actively acquires the current position and the charging pile position from the navigation unit 70. Further, during the driving of the hybrid vehicle, the navigation controller transmits the current position of the hybrid vehicle to the collection unit 10 according to a preset time or a preset rule, or the collection unit 10 actively acquires the current position from the navigation unit 70. Preferably, when the hybrid vehicle is started, the human-computer interaction interface can be used for a driver to input a current-day travel, the travel can be a path from the current position to the position of the charging pile directly, and can also be a path from the current position to the position of the charging pile after passing through a certain place, of course, the navigation controller can optimize the path according to the authorization of the driver, and can also optimize the path again when the path deviates in the driving process of the hybrid vehicle. After the position of the charging pile is selected, the hybrid vehicle can run without intervention of a driver, and the navigation controller can automatically update the current position and optimize the path so as to improve the economy of a power system. However, if the position of the charging pile changes due to the change of the travel, the driver needs to operate the charging pile.
Preferably, the acquisition unit 10, the calculation unit 20 and the control unit 30 may be integrated in a vehicle control unit, and the navigation unit 70 is connected to the vehicle control unit through a CAN.
In a further embodiment, the control system further comprises a power battery controller for managing the power battery 50 and information (remaining capacity, internal resistance, charge-discharge efficiency, charge-discharge capability, etc.) of the power battery 50.
In a preferred embodiment, the acquisition unit 10 is also used to acquire the temperature of the power battery 50 at the start of the hybrid vehicle. The calculation unit 20 may further include an ideal depth of discharge estimation module and a driving range estimation module. The ideal depth of discharge estimation module is used for obtaining the lowest electric quantity SOC when the power battery 50 reaches the ideal depth of discharge according to the temperature of the power battery 50LowChAnd according to the required electric quantity, the residual electric quantity and the lowest electric quantity SOCLowChObtaining the target charge capacity SOC of the power battery 50refer. Preferably, the power batteryThe ideal depth of discharge of 50 is affected by the ambient temperature (obtained by collecting the temperature of the power battery 50 when the hybrid vehicle is started), and the change of the ideal depth of discharge is brought by the change of the ambient temperature, and in a specific embodiment, the minimum electric quantity SOC at the ideal depth of discharge corresponding to the temperature of the power battery 50 can be obtained by searching the parameter table of the power battery 50LowChThe lowest power SOC when the ideal depth of discharge is considered in calculating the required powerLowChThe scheme can effectively avoid the damage of the power battery 50 caused by the overlarge discharge depth. The driving range estimation module is used for calculating the SOC of the power battery 50 from the residual electric quantity to the lowest electric quantityLowChDriving range in time.
With continued reference to fig. 1, in a particular embodiment, the acquisition unit 10 is also used to acquire the current driving speed v of the hybrid vehicle. The calculating unit 20 is further configured to calculate a distance between the current position and the charging pile position in real time, and obtain a distance S at a previous preset timereal-t0Distance S from the current timereal-t1. The control system further comprises a determination unit 60, connected to both the calculation unit 20 and the control unit 30, for determining the current driving speed v and the distance S from the previous preset timereal-t0Distance S from the current timereal-t1Judging the running state of the hybrid vehicle and generating a return flag bit Hflag. Wherein, if the distance S of the previous preset momentreal-t0A distance S less than the current timereal-t1And the current running speed v is greater than zero, the flag bit H is returnedflagEqual to zero. If the distance S of the previous preset momentreal-t0Greater than the distance S at the present momentreal-t1And the current running speed v is greater than zero, the flag bit H is returnedflagEqual to one. When returning to the flag bit HflagA value equal to zero indicates that the hybrid vehicle is in a drive-off state, i.e. a state of driving off the charging pile position, and conversely when returning to the flag HflagA time equal to one indicates that the hybrid vehicle is in a return state, i.e., a state of returning to the charging post position. The preset time can be calibrated according to actual needs, such as 1 min. It should be noted that, when the flag bit H is returnedflagAnd when the current position of the hybrid vehicle is equal to zero, if the hybrid vehicle returns to the position of the charging pile, assuming that the distance between the current position of the hybrid vehicle and the position of the charging pile is S, the hybrid vehicle needs to travel for at least 2S when returning from the current position to the position of the charging pile. That is, when the required electric quantity of the hybrid battery 50 running from the current position to the charging pile position in the pure electric mode is obtained according to the current position and the charging pile position, the return flag H of the hybrid vehicle needs to be consideredflagIf the flag bit H is returnedflagIf the required electric quantity is one, the required electric quantity is the electric quantity required when the hybrid power battery 50 runs from the current position to the position of the charging pile in the pure electric mode, and if the required electric quantity returns to the mark bit HflagAnd if the current position of the hybrid power battery 50 is zero, the required electric quantity is twice of the electric quantity required when the hybrid power battery is driven from the current position to the charging pile position in the pure electric mode. Thus, the combined return flag bit HflagThe method for calculating the required electric quantity of the power battery 50 can not only improve the charging and discharging efficiency of the power battery 50, but also reduce the use cost of users.
The power system of the hybrid vehicle is connected to the power battery 50, and the power system may provide power for the hybrid vehicle to travel, or may charge the power battery 50 when the power battery 50 is short of electricity, for example, may be an engine system. Preferably, the execution unit 40 is the power system.
In one embodiment, the control system employs a multi-modal control of the power cell 50, and the power cell 50 of the hybrid vehicle operates in four modes, as shown in table 1 below.
TABLE 1
Power battery working Mode Return flag bit Hflag Driving range judgment
Mode 1 0 Sreal>SE/2
Mode 2 0 Sreal<SE/2
Mode 3 1 Sreal>SE
Mode 4 1 Sreal<SE
Wherein S isrealIndicating the distance (actual mileage) from the current position to the position of the charging pile, SEIndicating the driving range that the remaining capacity of the power battery 50 can provide.
By returning a flag bit HflagAnd the relation between the remaining power of the power battery 50 and the required power (driving range S)EAnd actual mileage SrealIn relation to (b) identifies the operating mode of the power cell 50 and controls accordingly.
In table 1 above, Mode1 indicates that the hybrid vehicle is intended to drive away and the remaining capacity of the power battery 50 is sufficient to return to the charging pile position; mode 2 indicates that the hybrid vehicle is in an intention of driving away and the residual capacity of the power battery 50 is insufficient to return to the charging pile position; mode 3 indicates that the hybrid vehicle is a return intention and the remaining amount of the power battery 50 is sufficient to return to the charging pile position; mode 4 indicates that the hybrid vehicle is a return intention and the remaining capacity of the power battery 50 is insufficient to return to the charging pile position.
In a further embodiment, the control unit 30 is further arranged to return the flag bit HflagEqual to zero and target charge capacity SOCreferAnd outputting a first control instruction when the output voltage is greater than zero. Return flag bit HflagEqual to zero and target charge capacity SOCreferGreater than zero means that the hybrid vehicle is in a drive-off state and the power of the power battery 50 is insufficient for the hybrid vehicle to return to the charging post position in the electric-only Mode, i.e., Mode 2 in table 1 above. The execution unit 40 is further configured to control the electric quantity of the power battery 50 to be maintained at [ SOC ] according to the first control instructionM2L，SOCM2H]Within the range of (1). In a specific embodiment, [ SOC ]M2L，SOCM2H]Can be (75%, 80%)]Or [ 75%, 85% ]]Etc., [ SOC ]M2L，SOCM2H]The determination of (a) is performed by considering a plurality of factors, such as the structure of the power system of the hybrid vehicle (series hybrid or parallel hybrid), various parameters of the power battery 50 (capacity, internal resistance, charge-discharge efficiency, charge-discharge capability, etc.), rated operating voltages of high-voltage components of the power system, efficiency performances under different voltages, and the like. Preferably, [ SOC ]M2L，SOCM2H]The method can be obtained by simulation and real vehicle calibration. While keeping the electric quantity of the power battery 50 at [ SOC ]M2L，SOCM2H]Within the range, the control effect can be optimized by adjusting the corresponding calibration quantity, the phenomenon that the driving feeling is influenced by frequent switching of the working modes can be avoided, the efficiency of a power system can be optimized, and the utilization rate of the parking charging electric quantity is improved.
In a further embodiment, the control unit 30 is further arranged to return the flag bit HflagEqual to one and target charge capacity SOCreferWhen the charge quantity is larger than zero, the target charge quantity SOCreferSetting the float value SOCaddHAnd a lower floating value SOCaddLIf the target charging capacity SOCreferAnd floating value SOCaddHIs greater than or equal to SOCM2HIf so, the control unit 30 outputs a second control command, and if the target charging capacity SOC is setreferAnd floating value SOCaddHIs less than SOCM2HIf so, a third control instruction is output. Return flag bit HflagEqual to one and targetSOC of charging quantityreferGreater than zero means that the hybrid vehicle is in a return state and the charge of the power battery 50 is insufficient for the hybrid vehicle to return to the charging post position in the electric-only Mode, i.e., Mode 4 in table 1 above. The execution unit 40 is further configured to control the electric quantity of the power battery 50 to be maintained at [ SOC ] according to the second control instructionM2L，SOCM2H]Or controls the amount of electricity of the power battery 50 to be maintained at [ SOC ] according to the third control commandrefer-SOCaddL，SOCrefer+SOCaddH]Within the range of (1). The inventor finds that during the actual use of the hybrid vehicle, the hybrid vehicle is in a driving-off state, and the electric quantity of the power battery 50 is not enough for the hybrid vehicle to return to the charging pile position in the pure electric mode, so the SOC is more frequently generatedM2L，SOCM2H]Calibration is very accurate, so in this embodiment, the SOC is used when the hybrid vehicle is in a return state and the charge of the power battery 50 is insufficient for the hybrid vehicle to return to the charging post position in the electric only modeM2LAnd SOCM2HFor the reference value, the dynamic target range of the electric quantity of the power battery 50 is calibrated. Similarly, the control effect can be optimized by adjusting the corresponding calibration quantity, and the influence on the driving feeling caused by frequent switching of the working modes can be avoided.
Preferably, in one embodiment, the power battery 50 is controlled accordingly in the four operating modes as shown in table 2 below.
TABLE 2
Figure BDA0002488314950000101
Wherein, the Mode1-4 corresponds to the Mode1-4 in the table 1; SOCM4LCorresponds to the above SOCM2LOr SOCrefer-SOCaddL，SOCM4HCorresponds to the above SOCM2HOr SOCrefer+SOCaddH。
Therefore, the control quantity battery is controlled in a multi-mode manner, so that the electric quantity of the battery can be used as much as possible when the hybrid vehicle returns to the position of the charging pile, the use cost of the hybrid vehicle is reduced, the efficiency of a power system of the hybrid vehicle can be optimized, the discharging capacity of the power battery 50 and the charging and discharging efficiency of the power battery 50 are indirectly improved, the temperature rise energy loss of the power battery 50 is reduced, the heat management energy requirement of the power battery 50 is reduced, and the improvement of the dynamic property of the vehicle is facilitated.
Fig. 2 is a block flow diagram of a control method for a power battery of a hybrid vehicle according to an embodiment of the invention. As shown in fig. 2, the present invention also provides a control method of a power battery 50 for a hybrid vehicle, which generally includes:
s10: acquiring the current position of the hybrid vehicle, the position of a charging pile and the residual electric quantity of the power battery 50 in real time;
s20: obtaining the required electric quantity of the hybrid power battery 50 from the current position to the charging pile position in the pure electric mode according to the current position and the charging pile position, and obtaining the target charging electric quantity SOC of the hybrid power battery 50 according to the required electric quantity and the residual electric quantityrefer；
S30: judging target charging capacity SOCreferWhether it is greater than zero;
s40: if yes, charging the target charge capacity SOCreferConverting into driving charging power target value PChAnd outputs a charging flag bit Ch of the traveling craneflagTarget charging power value P of running vehicleCh；
S50: target value P of charging power of travelling craneChThe power battery 50 is charged according to the coupling result.
The control method provided by the embodiment acquires the current position of the hybrid vehicle, the charging pile position and the residual electric quantity of the power battery 50 to obtain the target charging power value PChThen according to the target charging power value PChAnd the running power required by the hybrid power vehicle supplements the power for the power battery 50 in advance, so that the working voltage of a high-voltage system of the hybrid power vehicle can be increased, the working efficiency of the power system is improved, and the dynamic property of the hybrid power vehicle can be further improved. Makes up for the prior artThe power battery 50 is not charged enough only when the charge level of the power battery 50 is below the threshold.
The current position of the hybrid vehicle can be identified through a positioning system of the vehicle, and the position of the charging pile can be selected by a driver as required and input into a control system. On one hand, when the driver starts the hybrid electric vehicle, the position of the charging pile can be set, then the control system predicts whether the electric quantity of the power battery 50 can meet the electricity demand of the current journey according to the current position, the position of the charging pile and the residual electric quantity of the power battery 50, and if the electric quantity cannot meet the electricity demand of the current journey, the control system can start the hybrid electric vehicle according to the target charging power value PChAnd the running power demand of the hybrid vehicle to supplement the power battery 50 in advance. On the other hand, the control method can also collect the current position of the hybrid vehicle and the residual electric quantity of the power battery 50 in real time in the running process of the hybrid vehicle, and can supplement the power battery 50 in advance according to the real-time residual electric quantity of the power battery 50, so that the problem of insufficient electric quantity of the power battery 50 caused by the fact that a driver changes a stroke can be solved, the flexibility of a control system is improved, and the insufficient dynamic property of the hybrid vehicle cannot be caused by the information obtained when the hybrid vehicle is started.
In a preferred embodiment, the control method can coordinate to regulate and control the braking force battery 50 to perform ordered charging and discharging according to the remaining electric quantity of the power battery 50, the current position of the hybrid vehicle and the charging pile position, the power battery 50 is supplemented with electricity in advance when the electric quantity of the power battery 50 is not enough for the current journey, the pure electric mode is adopted to drive when the electric quantity of the power battery 50 is enough, the power battery 50 is preferentially used for the hybrid vehicle on the premise that the power battery 50 does not discharge when the current journey is finished, and the electric quantity in the power battery 50 is fully utilized when the vehicle returns to the charging pile position, so that the efficiency of a power system is provided, and the use ratio of the vehicle to the charging and energy storage of a power grid is improved.
In a specific embodiment, when the hybrid vehicle is started, the navigation unit 70 automatically locates the current position of the hybrid vehicle, the driver selects the charging pile position in the navigation unit 70 through the human-computer interface, and then the navigation controller sends the current position and the charging pile position to the acquisition unit 10, or the acquisition unit 10 actively acquires the current position and the charging pile position from the navigation unit 70. Further, during the driving of the hybrid vehicle, the navigation controller transmits the current position of the hybrid vehicle to the collection unit 10 according to a preset time or a preset rule, or the collection unit 10 actively acquires the current position from the navigation unit 70. Preferably, when the hybrid vehicle is started, the human-computer interaction interface can be used for a driver to input a current-day travel, the travel can be a path from the current position to the position of the charging pile directly, and can also be a path from the current position to the position of the charging pile after passing through a certain place, of course, the navigation controller can optimize the path according to the authorization of the driver, and can also optimize the path again when the path deviates in the driving process of the hybrid vehicle. After the position of the charging pile is selected, the hybrid vehicle can run without intervention of a driver, and the navigation controller can automatically update the current position and optimize the path so as to improve the economy of a power system. However, if the position of the charging pile changes due to the change of the travel, the driver needs to operate the charging pile.
In a specific embodiment, the target charge SOC of the power battery is obtainedreferThe method also comprises the following steps:
collecting the temperature of the power battery 50 at the start of the hybrid vehicle;
obtaining the lowest electric quantity SOC when the power battery 50 reaches the ideal discharge depth according to the temperature of the power battery 50LowChAnd according to the required electric quantity, the residual electric quantity and the lowest electric quantity SOCLowChObtaining the target charge capacity SOC of the power battery 50refer。
Preferably, the ideal depth of discharge of the power battery 50 is affected by the ambient temperature (obtained by collecting the temperature of the power battery 50 when the hybrid vehicle is started), and the change of the ambient temperature brings about the change of the ideal depth of discharge, and in a specific embodiment, the minimum electric quantity SO at the ideal depth of discharge corresponding to the temperature of the power battery 50 can be obtained by searching the parameter table of the power battery 50CLowChThe lowest power SOC when the ideal depth of discharge is considered in calculating the required powerLowChThe scheme can effectively avoid the damage of the power battery 50 caused by the overlarge discharge depth.
In a further embodiment, the target charge SOC of the power battery is obtainedreferThe method also comprises the following steps:
collecting the current running speed v of the hybrid power vehicle;
calculating the distance between the current position and the position of the charging pile in real time, and obtaining the distance S of the previous preset momentreal-t0Distance S from the current timereal-t1；
According to the current running speed v and the distance S of the previous preset momentreal-t0Distance S from the current timereal-t1Judging the running state of the hybrid vehicle and generating a return flag bit Hflag；
Wherein, if the distance S of the previous preset momentreal-t0A distance S less than the current timereal-t1And the current running speed v is greater than zero, the flag bit H is returnedflagIs equal to zero;
if the distance S of the previous preset momentreal-t0Greater than the distance S at the present momentreal-t1And the current running speed v is greater than zero, the flag bit H is returnedflagEqual to one.
When returning to the flag bit HflagA value equal to zero indicates that the hybrid vehicle is in a drive-off state, i.e. a state of driving off the charging pile position, and conversely when returning to the flag HflagA time equal to one indicates that the hybrid vehicle is in a return state, i.e., a state of returning to the charging post position. The preset time can be calibrated according to actual needs, such as 1 min. It should be noted that, when the flag bit H is returnedflagAnd when the current position of the hybrid vehicle is equal to zero, if the hybrid vehicle returns to the position of the charging pile, assuming that the distance between the current position of the hybrid vehicle and the position of the charging pile is S, the hybrid vehicle needs to travel for at least 2S when returning from the current position to the position of the charging pile. That is, the hybrid power battery 50 is obtained according to the current position and the charging pile position in the pure electric modeWhen the current position is driven to the required electric quantity of the charging pile position, the return marker bit H of the hybrid vehicle needs to be consideredflagIf the flag bit H is returnedflagIf the required electric quantity is one, the required electric quantity is the electric quantity required when the hybrid power battery 50 runs from the current position to the position of the charging pile in the pure electric mode, and if the required electric quantity returns to the mark bit HflagAnd is zero, the required electric quantity is twice of the electric quantity required when the hybrid power battery 50 runs from the current position to the charging pile position in the pure electric mode. Thus, the combined return flag bit HflagThe method for calculating the required electric quantity of the power battery 50 can not only improve the charging and discharging efficiency of the power battery 50, but also reduce the use cost of users.
The power system of the hybrid vehicle is connected to the power battery 50, and the power system may provide power for the hybrid vehicle to travel, or may charge the power battery 50 when the power battery 50 is short of electricity, for example, may be an engine system.
In a more specific embodiment, charging the power battery further comprises:
at the return flag bit HflagEqual to zero and target charge capacity SOCreferOutputting a first control instruction when the output value is greater than zero;
controlling the amount of electricity of the rechargeable power battery 50 to be maintained at [ SOC ] according to the first control commandM2L，SOCM2H]Within the range of (1).
In this embodiment, a return flag bit HflagEqual to zero and target charge capacity SOCreferGreater than zero means that the hybrid vehicle is in a drive-off state and the power of the power battery 50 is insufficient for the hybrid vehicle to return to the charging post position in the electric-only Mode, i.e., Mode 2 in table 1 above. In a specific embodiment, [ SOC ]M2L，SOCM2H]Can be (75%, 80%)]Or [ 75%, 85% ]]Etc., [ SOC ]M2L，SOCM2H]The determination of (a) is performed by considering a plurality of factors, such as the structure of the power system of the hybrid vehicle (series hybrid or parallel hybrid), various parameters of the power battery 50 (capacity, internal resistance, charge-discharge efficiency, charge-discharge capability, etc.), and rated operation of high-voltage components of the power systemVoltage and efficiency performance at different voltages, etc. Preferably, [ SOC ]M2L，SOCM2H]The method can be obtained by simulation and real vehicle calibration. While keeping the electric quantity of the power battery 50 at [ SOC ]M2L，SOCM2H]Within the range, the control effect can be optimized by adjusting the corresponding calibration quantity, the phenomenon that the driving feeling is influenced by frequent switching of the working modes can be avoided, the efficiency of a power system can be optimized, and the utilization rate of the parking charging electric quantity is improved.
In a preferred embodiment, charging the power battery further comprises:
at the return flag bit HflagEqual to one and target charge capacity SOCreferWhen the charge quantity is larger than zero, the target charge quantity SOCreferSetting the float value SOCaddHAnd a lower floating value SOCaddLIf the target charging capacity SOCreferAnd floating value SOCaddHIs greater than or equal to SOCM2HIf so, the control unit 30 outputs a second control command, and if the target charging capacity SOC is setreferAnd floating value SOCaddHIs less than SOCM2HIf so, outputting a third control instruction;
controlling the amount of electricity of the rechargeable power battery 50 to be maintained at [ SOC ] according to the second control commandM2L，SOCM2H]Or controls the amount of electricity of the power battery 50 to be maintained at [ SOC ] according to the third control commandrefer-SOCaddL，SOCrefer+SOCaddH]Within the range of (1).
In this embodiment, a return flag bit HflagEqual to one and target charge capacity SOCreferGreater than zero means that the hybrid vehicle is in a return state and the charge of the power battery 50 is insufficient for the hybrid vehicle to return to the charging post position in the electric-only Mode, i.e., Mode 4 in table 1 above. The inventor finds that during the actual use of the hybrid vehicle, the hybrid vehicle is in a driving-off state, and the electric quantity of the power battery 50 is not enough for the hybrid vehicle to return to the charging pile position in the pure electric mode, so the SOC is more frequently generatedM2L，SOCM2H]The calibration is very accurate, so in this embodiment, when the hybrid vehicle is in a return state andwhen the electric quantity of the power battery 50 is not enough for the hybrid electric vehicle to return to the position of the charging pile in the pure electric mode, the SOC is usedM2LAnd SOCM2HFor the reference value, the dynamic target range of the electric quantity of the power battery 50 is calibrated. Similarly, the control effect can be optimized by adjusting the corresponding calibration quantity, and the influence on the driving feeling caused by frequent switching of the working modes can be avoided.
Therefore, the control quantity battery is controlled in a multi-mode manner, so that the electric quantity of the battery can be used as much as possible when the hybrid vehicle returns to the position of the charging pile, the use cost of the hybrid vehicle is reduced, the efficiency of a power system of the hybrid vehicle can be optimized, the discharging capacity of the power battery 50 and the charging and discharging efficiency of the power battery 50 are indirectly improved, the temperature rise energy loss of the power battery 50 is reduced, the heat management energy requirement of the power battery 50 is reduced, the vehicle economy is further improved, and the improvement of the vehicle dynamic property is facilitated.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims (10)

1. A control system for a power battery of a hybrid vehicle, characterized by comprising:
the acquisition unit (10) is connected with the power battery (50) and is used for acquiring the current position of the hybrid vehicle, the position of the charging pile and the residual electric quantity of the power battery (50) in real time;
the calculation unit (20) is connected with the acquisition unit (10), and the calculation unit (20) is used for acquiring the required electric quantity of the hybrid power battery (50) which runs from the current position to the charging pile position in a pure electric mode according to the current position and the charging pile position, and acquiring the target electric quantity of the power battery (50) according to the required electric quantity and the residual electric quantitySOC of charging quantityrefer；
A control unit (30) connected to the calculation unit (20), the control unit (30) being configured to control the target charge capacity SOCreferWhen the charge quantity is larger than zero, the target charge quantity SOC is obtainedreferConverting into driving charging power target value PChAnd outputting the driving charging power target value PCh；
An execution unit (40) connected with the control unit (30) and the power battery (50), wherein the execution unit (40) is used for converting the driving charging power target value PChAnd the power is coupled with the driving power demand of the hybrid vehicle, and then the power battery (50) is charged according to the coupling result.
2. The control system according to claim 1, characterized in that the acquisition unit (10) is further configured to acquire the temperature of the power battery (50) at the start of the hybrid vehicle;
the calculation unit (20) is also used for obtaining the lowest electric quantity SOC when the power battery (50) reaches the ideal discharge depth according to the temperature of the power battery (50)LowChAnd according to the required electric quantity, the residual electric quantity and the lowest electric quantity SOCLowChObtaining a target charge capacity SOC of the power battery (50)refer。
3. The control system according to claim 2, characterized in that the acquisition unit (10) is also configured to acquire a current running speed v of the hybrid vehicle;
the calculation unit (20) is also used for calculating the distance between the current position and the charging pile position in real time and obtaining the distance S of the previous preset momentreal-t0Distance S from the current timereal-t1；
The control system further comprises:
a judging unit (60) connected with the calculating unit (20) and the control unit (30) and used for judging the distance S between the current running speed v and the previous preset time according to the current running speed vreal-t0And the above-mentionedDistance S at the present timereal-t1Judging the running state of the hybrid vehicle and generating a return flag bit Hflag；
Wherein, if the distance S of the previous preset momentreal-t0A distance S less than the current timereal-t1And the current running speed v is greater than zero, the return flag bit HflagIs equal to zero;
if the distance S of the previous preset momentreal-t0A distance S greater than the current timereal-t1And the current running speed v is greater than zero, the return flag bit HflagEqual to one.
4. The control system of claim 3, wherein the control unit (30) is further configured to:
at the return flag bit HflagEqual to zero and the target charge capacity SOCreferOutputting a first control instruction when the output value is greater than zero;
the execution unit (40) is also used for controlling the electric quantity of the power battery (50) to be kept at [ SOC ] according to the first control instructionM2L，SOCM2H]Within the range of (1).
5. The control system of claim 4, wherein the control unit (30) is further configured to:
at the return flag bit HflagEqual to one and the target charging capacity SOCreferWhen the charge quantity is larger than zero, the target charge quantity SOC is obtainedreferSetting the float value SOCaddHAnd a lower floating value SOCaddLIf the target charging capacity SOC is not reachedreferAnd said floating value SOCaddHIs greater than or equal to SOCM2HIf so, the control unit (30) outputs a second control instruction, and if the target charging capacity SOC isreferAnd said floating value SOCaddHIs less than SOCM2HIf so, outputting a third control instruction;
the execution unit (40) is also used for controlling the electric quantity maintenance of the power battery (50) according to the second control instructionIn [ SOC ]M2L，SOCM2H]And controlling the amount of electricity of the power battery (50) to be maintained at [ SOC ] according to the third control commandrefer-SOCaddL，SOCrefer+SOCaddH]Within the range of (1).
6. A control method for a power battery of a hybrid vehicle, characterized by comprising:
acquiring the current position of the hybrid vehicle, the position of a charging pile and the residual electric quantity of the power battery (50) in real time;
obtaining the required electric quantity of the hybrid power battery (50) running from the current position to the charging pile position in a pure electric mode according to the current position and the charging pile position, and obtaining the target charging electric quantity SOC of the power battery (50) according to the required electric quantity and the residual electric quantityrefer；
At the target charging capacity SOCreferWhen the charge quantity is larger than zero, the target charge quantity SOC is obtainedreferConverting into driving charging power target value PChAnd outputting the driving charging power target value PCh；
The driving charging power target value P is obtainedChAnd the power is coupled with the driving power demand of the hybrid vehicle, and then the power battery (50) is charged according to the coupling result.
7. The control method according to claim 6, characterized in that the target charge SOC of the power battery (50) is obtainedreferThe method also comprises the following steps:
collecting the temperature of the power battery (50) at the start of the hybrid vehicle;
obtaining the lowest electric quantity SOC when the power battery (50) reaches the ideal discharge depth according to the temperature of the power battery (50)LowChAnd according to the required electric quantity, the residual electric quantity and the lowest electric quantity SOCLowChObtaining a target charge capacity SOC of the power battery (50)refer。
8. The control method according to claim 7, characterized in that the target charge SOC of the power battery (50) is obtainedreferThe method also comprises the following steps:
acquiring the current running speed v of the hybrid vehicle;
calculating the distance between the current position and the charging pile position in real time, and obtaining the distance S of the previous preset momentreal-t0Distance S from the current timereal-t1；
According to the current running speed v and the distance S of the previous preset momentreal-t0A distance S from the current timereal-t1Judging the running state of the hybrid vehicle and generating a return flag bit Hflag；
Wherein, if the distance S of the previous preset momentreal-t0A distance S less than the current timereal-t1And the current running speed v is greater than zero, the return flag bit HflagIs equal to zero;
if the distance S of the previous preset momentreal-t0A distance S greater than the current timereal-t1And the current running speed v is greater than zero, the return flag bit HflagEqual to one.
9. The control method according to claim 8, wherein charging the power battery (50) further comprises:
at the return flag bit HflagEqual to zero and the target charge capacity SOCreferOutputting a first control instruction when the output value is greater than zero;
controlling the electric quantity of the power battery (50) to be kept at [ SOC ] according to the first control instructionM2L，SOCM2H]Within the range of (1).
10. The control method according to claim 9, wherein charging the power battery (50) further comprises:
at the return flag bit HflagIs equal to one andthe target charging capacity SOCreferWhen the charge quantity is larger than zero, the target charge quantity SOC is obtainedreferSetting the float value SOCaddHAnd a lower floating value SOCaddLIf the target charging capacity SOC is not reachedreferAnd said floating value SOCaddHIs greater than or equal to SOCM2HIf so, the control unit (30) outputs a second control instruction, and if the target charging capacity SOC isreferAnd said floating value SOCaddHIs less than SOCM2HIf so, outputting a third control instruction;
controlling the electric quantity of the power battery (50) to be kept at [ SOC ] according to the second control instructionM2L，SOCM2H]Or control the electric quantity of the power battery (50) to be kept at [ SOC ] according to the third control instructionrefer-SOCaddL，SOCrefer+SOCaddH]Within the range of (1).
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