CN112583068A - Control method and system of direct current/direct current DC/DC converter - Google Patents

Control method and system of direct current/direct current DC/DC converter Download PDF

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Publication number
CN112583068A
CN112583068A CN202011218549.XA CN202011218549A CN112583068A CN 112583068 A CN112583068 A CN 112583068A CN 202011218549 A CN202011218549 A CN 202011218549A CN 112583068 A CN112583068 A CN 112583068A
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China
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voltage
state
low
voltage value
value
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CN202011218549.XA
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CN112583068B (en
Inventor
宋丹丹
张君伟
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Great Wall Motor Co Ltd
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Great Wall Motor Co Ltd
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Priority to CN202011218549.XA priority Critical patent/CN112583068B/en
Publication of CN112583068A publication Critical patent/CN112583068A/en
Priority to PCT/CN2021/127943 priority patent/WO2022095833A1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/005—Detection of state of health [SOH]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a control method and a control system of a direct current/direct current DC/DC converter. The control method of the DC/DC/DC converter according to the present invention is applied to a voltage value adjusting unit connected to the DC/DC converter and a low-voltage battery, respectively, and includes: acquiring a preset voltage value of a low-voltage end of a DC/DC converter, a first actual voltage value of the low-voltage end of the DC/DC converter and a second actual voltage value of a low-voltage storage battery, wherein the preset voltage value is determined based on the current state of an automobile power system; and determining a target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value and the second actual voltage value. The invention improves the control accuracy of the DC/DC converter.

Description

Control method and system of direct current/direct current DC/DC converter
Technical Field
The invention relates to the technical field of automobiles, in particular to a control method and a control system of a direct current/direct current DC/DC converter.
Background
With the gradual development of the technical field of vehicle control, for new energy vehicles, a Direct Current/Direct Current (DC/DC or DCDC) converter is an important component for maintaining normal operation of a low-voltage circuit of the vehicle. The function is to convert the high voltage input by the power source such as the high-voltage battery and the generator into the low voltage required by the low-voltage load such as the storage battery. The storage battery is charged by controlling the output voltage of the low-voltage end (output end) of the DC/DC converter.
However, in the current control method of the DC/DC converter, the output voltage of the low-voltage end of the DC/DC converter is determined only by the temperature and the state of charge of the battery, so that the battery supplies power to the entire vehicle at a low voltage, which results in low control accuracy of the DC/DC converter.
Disclosure of Invention
In view of the above, the present invention is directed to a method and a system for controlling a DC/DC converter, so as to solve the problem of low control accuracy of the DCDC converter.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for controlling a DC/DC converter, applied to a voltage value adjusting unit connected to the DC/DC converter and a low-voltage battery, respectively, the method comprising:
acquiring a preset voltage value of a low-voltage end of a DC/DC converter, a first actual voltage value of the low-voltage end of the DC/DC converter and a second actual voltage value of a low-voltage storage battery, wherein the preset voltage value is determined based on the current state of an automobile power system;
and determining a target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value and the second actual voltage value.
Further, the current vehicle powertrain state is determined based on objective factors including one or more of: the temperature of the DC/DC converter, the opening degree of an accelerator pedal, the fuel cut-off state of an engine, the start-stop state of the engine, the state of a clutch, the voltage of the low-voltage battery, the temperature of the low-voltage battery, the state of charge of the low-voltage battery, or the state of health of the low-voltage battery.
Further, the current vehicle powertrain state includes one or more of: a quick charging state, a vulcanization protection state, a start-stop state or a pre-start state;
when the voltage of the low-voltage storage battery is lower than a first voltage threshold value, or the temperature of the DC/DC converter is smaller than a first temperature threshold value, the opening degree of an accelerator pedal is larger than an opening degree threshold value, the fuel cut-off state of the engine is fuel cut-off, the clutch state is an open state or a slip film state, the temperature of the low-voltage storage battery is smaller than a second temperature threshold value, the charge state of the low-voltage storage battery is smaller than a charge threshold value, and the health state of the low-voltage storage battery is in a target range, the current state of the automobile power system is a quick charge state;
when the voltage of the low-voltage storage battery is lower than a second voltage threshold, the temperature of the DC/DC converter is lower than a third temperature threshold, and the temperature of the low-voltage storage battery is lower than a fourth temperature threshold, the current automobile power system state is a vulcanization protection state;
when the starting and stopping state of the engine is a starting oil injection state, the current state of the automobile power system is a starting and stopping state;
and when the starting and stopping state of the engine is a starting success state, the current state of the automobile power system is a pre-starting state.
Further, the preset voltage value is determined based on the current vehicle power system state and the corresponding relationship between the vehicle power system state and the preset voltage value.
Further, the determining a target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value, and the second actual voltage value includes:
determining the small value of the preset voltage value and the first actual voltage value as a voltage value to be processed;
determining a difference value between the voltage value to be processed and the second actual voltage value;
and determining the sum of the voltage value to be processed and the difference value as a target voltage value.
Further, the method further comprises: and controlling the voltage value of the low-voltage end of the DC/DC converter to increase from an initial set value to the target voltage value.
Further, the method further comprises:
acquiring a voltage limit value of a low-voltage end of the DC/DC converter, wherein the voltage limit value is determined based on the charging voltage of the low-voltage storage battery;
and when the target voltage value is larger than the voltage limit value, updating the target voltage value to be the voltage limit value.
Another object of the present invention is to provide a control system for a DC/DC converter, the technical solution of the present invention is realized as follows:
a control system for a DC/DC converter, the system comprising:
the voltage value adjusting unit and the voltage value setting unit are connected with the voltage value adjusting unit;
the voltage value setting unit is configured to determine a preset voltage value of a low-voltage end of the DC/DC converter based on the current state of the automobile power system;
the voltage value adjusting unit is configured to acquire the preset voltage value, a first actual voltage value of a low-voltage end of the DC/DC converter, and a second actual voltage value of a low-voltage storage battery, and determine a target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value, and the second actual voltage value.
Further, the system further comprises: the special working condition calculation unit is connected with the voltage value setting unit; the special case calculation unit is configured to determine a current vehicle powertrain state based on target factors including one or more of: the temperature of the DC/DC converter, the opening degree of an accelerator pedal, the fuel cut-off state of an engine, the start-stop state of the engine, the state of a clutch, the voltage of the low-voltage battery, the temperature of the low-voltage battery, the state of charge of the low-voltage battery, or the state of health of the low-voltage battery.
Further, the system further comprises: the voltage limit value calculation unit is connected with the voltage value adjustment unit; the voltage limit calculation unit is configured to determine a voltage limit value of a low-voltage side of the DC/DC converter based on a charging voltage of the low-voltage battery.
The invention also aims to provide an automobile, and the technical scheme of the invention is realized as follows: an automobile comprising a control system of any of the DC/DC converters provided by the present invention.
According to the control method and system of the DC/DC converter, the preset voltage value determined based on the current automobile power system state is obtained, and the obtained preset voltage value, the first actual voltage value of the low-voltage end of the DC/DC converter and the second actual voltage value of the low-voltage storage battery are obtained. And determining a target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value and the second actual voltage value. Therefore, the state of the whole automobile power system can be considered in real time for determining the target voltage value of the low-voltage end of the DC/DC converter, the state of a storage battery (a low-voltage storage battery) is avoided being considered relatively singly, the control accuracy of the DC/DC converter is improved, and the balance of the energy of the whole automobile is realized to the maximum extent.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a control system of a DC/DC converter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a control system of another DC/DC converter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a state transition of a powertrain of a vehicle according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a principle of determining starting power consumption according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a voltage value adjusting unit according to an embodiment of the present invention;
fig. 6 is a schematic flowchart of a control method of a DC/DC converter according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a control device of a DC/DC converter according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, a schematic structural diagram of a control system of a DC/DC converter according to an embodiment of the present invention is shown. As shown in fig. 1, the control system may include:
a voltage value adjusting unit 101 and a voltage value setting unit 102 connected to the voltage value adjusting unit 101. The voltage value setting unit 102 is configured to determine a preset voltage value based on a current vehicle powertrain state. The state of the automobile power system is used for indicating the running condition state of the automobile. The voltage value adjustment unit 101 is configured to acquire a preset voltage value, a first actual voltage value of a low-voltage terminal of the DC/DC converter, and a second actual voltage value of the low-voltage battery. And determining a target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value and the second actual voltage value.
The voltage value adjusting unit 101 is configured to obtain a preset voltage value, the first actual voltage value and the second actual voltage value when the DC/DC converter is in a vibration state (burk).
In an alternative implementation, the DC/DC converter system includes: low voltage load, DC/DC converter, motor and high voltage battery. The input (high-voltage) of the DC/DC converter is connected to the motor and the high-voltage battery, and the output (low-voltage) of the DC/DC converter is connected to the low-voltage load. Wherein, the low-voltage load may include: and a low-voltage storage battery. The motor can be a Belt-Driven Starter Generator (BSG) which is also called a BSG motor and is used for starting and generating power.
According to the control system of the DC/DC converter, the voltage value setting unit determines the preset voltage value based on the current state of the automobile power system, so that the voltage value adjusting unit can obtain the preset voltage value, and the target voltage value of the low-voltage end of the DC/DC converter is determined based on the obtained preset voltage value, the first actual voltage value of the low-voltage end of the DC/DC converter and the second actual voltage value of the low-voltage storage battery. Therefore, the state of the whole automobile power system can be considered in real time by determining the target voltage value of the low-voltage end of the DC/DC converter, the state of a storage battery (a low-voltage storage battery) is avoided being considered relatively singly, the control accuracy of the DC/DC converter is improved, and the balance of the energy of the whole automobile is realized to the maximum extent.
Alternatively, the voltage value setting unit 102 may be configured to determine the preset voltage value based on the current vehicle power system state and the corresponding relationship between the vehicle power system state and the preset voltage value. For example, the voltage value setting unit 102 may store a preset voltage table for recording a corresponding relationship between a state of the vehicle power system and a preset voltage value. The voltage value setting unit 102 may obtain a preset voltage value corresponding to the current state of the vehicle power system by querying the preset voltage table.
The automobile is a new energy automobile, namely a hybrid electric automobile. The hybrid electric vehicle has at least two devices for powering the vehicle, such as a low-voltage battery and a power battery. The automobile may have special working conditions such as engine starting and stopping, energy recovery and long-time automobile placement. In embodiments of the invention, the vehicle powertrain state may include one or more of the following: a quick charging state, a vulcanization protection state, a starting and stopping state, a pre-starting state (also called a post-starting state) and a normal state. The quick charging state refers to a state that the automobile quickly charges the low-voltage storage battery. The vulcanization-protected state refers to a state in which the low-voltage battery is vulcanization-protected. The start-stop state refers to a state in which the engine is started or stopped. The pre-start state refers to a state after the engine is successfully started.
Based on this, the corresponding relationship between the vehicle power system state and the preset voltage value may include: the fast charging state corresponds to a first preset voltage value, the vulcanization protection state corresponds to a second preset voltage value, the start-stop state corresponds to a third preset voltage value, the pre-start state corresponds to a fourth preset voltage value, and the normal state corresponds to a fifth preset voltage value.
Wherein, first predetermined magnitude of voltage can be higher magnitude of voltage to lower at the car to the power battery electric quantity demand, and under the circumstances that low pressure battery and power battery electric quantity allowed, satisfy the quick charge to the low pressure battery. The second preset voltage value may be a lower voltage value to realize vulcanization protection of the low-voltage battery when the states of the low-voltage battery and the DC/DC converter are poor. The second predetermined voltage value may be calibrated based on low-voltage battery characteristics. The third preset voltage value may be a higher voltage value to realize rapid charging of the low-voltage battery when the electric quantity of the low-voltage battery is consumed more after the engine is started. The fourth preset voltage value can be a lower voltage value so as to meet the requirement of the motor on the electric quantity of the power battery when the motor starts the engine. The fifth preset value may be determined based on a state of charge (SOC) and a temperature of the low-voltage battery.
Optionally, as shown in fig. 2, the control system of the DC/DC converter may further include: a normal voltage value calculation unit 103. The normal voltage value calculating module 103 is connected to the voltage value setting unit 102. The normal voltage value calculation unit 103 is configured to determine that the vehicle power system state is a normal state corresponding to a preset voltage value (i.e., a fifth preset voltage value) based on the SOC and the temperature of the low-voltage battery. For example, the normal voltage value calculation unit 103 is configured to determine a voltage value corresponding to the current SOC and the current temperature based on the current SOC of the low-voltage battery, the current temperature of the low-voltage battery, and the correspondence relationship between the SOC of the low-voltage battery, the temperature, and the voltage value, the voltage value being a fifth preset voltage value. The normal voltage value calculation unit 103 may record a correspondence relationship between the SOC and the temperature of the low-voltage battery and the voltage value through the normal voltage correspondence table.
In the embodiment of the present invention, the normal voltage value calculation unit 103 may determine the fifth preset voltage value based on the SOC and the temperature of the low-voltage battery when the SOC of the low-voltage battery is in the valid state and the temperature of the low-voltage battery is in the valid state. It can be understood that: the normal voltage value calculation unit 103 determines a fifth preset voltage value based on the SOC, the temperature of the low-voltage battery, the SOC state of the low-voltage battery, and the temperature state.
Further, with continued reference to fig. 2, the control system of the DC/DC converter may further include: and a special condition calculation unit 104 connected with the voltage value setting unit 102. The special case calculation unit 104 is configured to determine the current vehicle powertrain state based on the target factors. The target factors include one or more of: the temperature of the DC/DC converter, the opening degree of an accelerator pedal, the fuel cut-off state of the engine, the start-stop state of the engine, the clutch state, the voltage of the low-voltage battery, the temperature of the low-voltage battery, the SOC of the low-voltage battery, or the state of health of the low-voltage battery.
In the embodiment of the invention, the states of the automobile power system including a quick charging state, a vulcanization protection state, a start-stop state and a pre-starting state are taken as examples for explanation. When the driver releases the throttle, so that the automobile is in a sliding state and the engine is still running, the state of the automobile power system can be determined to be a quick charging state. The vehicle powertrain state may be determined to be a pre-start state for a certain period of time after a successful start-up (completion of start-up) of the engine. The state of the automobile power system can be determined to be a start-stop state in the process of starting and stopping the transmitter. As shown in fig. 3, the special condition calculation unit 104 is configured to acquire the temperature of the DC/DC converter, the opening degree of the accelerator pedal, the fuel cut state of the engine, the start-stop state of the engine, the clutch state, the voltage of the low-voltage battery, the temperature of the low-voltage battery, the state of charge of the low-voltage battery, or the state of health of the low-voltage battery.
And when the voltage of the low-voltage storage battery is lower than a first voltage threshold value, or the temperature of the DC/DC converter is lower than a first temperature threshold value, the opening degree of an accelerator pedal is larger than an opening degree threshold value, the fuel cut-off state of the engine is fuel cut-off, the clutch state is an open state or a slip film state, the temperature of the low-voltage storage battery is lower than a second temperature threshold value, the charge state of the low-voltage storage battery is smaller than a charge threshold value, and the health state of the low-voltage storage battery is in a target range, determining that the current state of the automobile.
And when the voltage of the low-voltage storage battery is lower than a second voltage threshold, the temperature of the DC/DC converter is lower than a third temperature threshold and the temperature of the low-voltage storage battery is lower than a fourth temperature threshold, determining that the current automobile power system state is a vulcanization protection state.
And when the starting and stopping state of the engine is the starting and oil injection state, determining that the current state of the automobile power system is the starting and stopping state.
And when the starting and stopping state of the engine is a starting success state, determining that the current power system state of the automobile is in a pre-starting state.
Further, the vehicle power system state also includes a normal state. The special condition calculation unit 104 is further configured to determine that the vehicle power system state is converted from the fast charge state to the normal state after a first preset time period when the vehicle power system state is the fast charge state. And when the state of the automobile power system is the vulcanization protection state, determining that the state of the automobile power system is converted from the vulcanization protection state to the normal state after a second preset time. And when the state of the automobile power system is the start-stop state, determining that the state of the automobile power system is converted into the normal state from the start-stop state after the engine is stopped. And when the state of the automobile power system is in a pre-starting state, determining that the state of the automobile power system is converted from the pre-starting state to a normal state after a third preset time period. For example, the first preset time period may be a time period consumed when the low-voltage battery is charged to a specified charge threshold. The second predetermined period of time may be calibrated based on characteristics of the low voltage battery. The third predetermined period of time may be determined based on the amount of power consumed during the start-up of the engine.
Alternatively, the third preset time period may be determined based on a consumed time period of the power consumption during the start-up of the cranking. For example, the third preset time period may be a time period during which the start-up power consumption is calculated based on the current of the low-voltage battery and the start-stop state of the engine, wherein the start-up power consumption may be determined based on an ampere-hour integration method.
Fig. 4 is a schematic diagram illustrating a principle of determining startup power consumption according to an embodiment of the present invention. The starting power consumption amount in the starting process of the transmitter is determined through the starting power consumption amount calculation module. The starting power consumption calculating module may be a module of the special condition calculating unit 104, or may be an independent module. The startup power consumption calculation module includes: a reset/set Latch (SR-Latch), a conditional constructor (criterion) u2, an enable Latch (EnableLatch) En _ Latch, a divider x0:0, an adder sum1, an inverter NOT, and a ZERO controller CON _ ZERO _ C for outputting 0. The reset/set latch includes two input terminals, a reset terminal rs and a set terminal set, and a latch output terminal L1. The two input ends are used for inputting time sequence signals corresponding to the starting and stopping states of the engine. The reset signal of the reset terminal is a rising edge (rising _ edge) signal. The condition builder u2 includes a first value input, a condition input, a second value input, and a result output, the second input being connected to the zero controller. The judgment process (criterion: u2 ═ 0) of the condition constructor is that when the value of the condition input end is not equal to 0, the result output end outputs the value of the first value input end; and when the value of the condition input end is equal to 0, the result output end outputs the value of the second value input end. The latch output end is connected with the condition input end. The enable latch comprises a set input terminal, an enable input terminal and a latch output terminal. The setting input end is connected with the result output end, and the enabling input end is connected with the phase inverter and used for inputting the time sequence signal corresponding to the starting and stopping states of the engine. The latch output end is used for outputting starting consumed electric quantity. One of the two input ends of the adder is used for inputting the low-voltage storage battery current, and the other input end of the adder is connected with the output end of the divider. An output of the adder is connected to a first value input of the condition builder. The input of the divider is connected to the result output of the condition builder. The value of the reset/set latch output is not equal to 0 during engine start-up. At this time, the condition constructor outputs an integrated accumulated value of the battery current, and further enables the latch to output the integrated accumulated value. The third predetermined duration may then be the duration of time that the enable latch outputs the ever-changing integrated accumulation value.
In this embodiment of the present invention, the voltage value adjusting unit 101 may be configured to modify the preset voltage value output by the voltage value setting unit 102 according to the first actual voltage child of the low-voltage battery, so as to implement line impedance compensation. Optionally, as shown in fig. 5, the voltage value adjusting unit 101 may further include: a get small module 1011, a get difference module 1012 and a sum module 1013. The small-fetching module 1011 is connected 1013 to a difference-fetching module 1012 and a summing module, respectively. The small-taking module 1011 is configured to determine that a preset voltage value of the low-voltage end of the DC/DC converter and a small value of the first actual voltage values of the low-voltage end of the DC/DC converter are small as the voltage values to be processed. The difference module 1012 is configured to determine a difference of the voltage value to be processed and the second actual voltage value. The summing module 1013 is configured to determine the sum of the voltage value to be processed and the difference value as a target voltage value.
Further, the voltage value adjusting unit 101 may further include: a filtering module 1014 connected to the summing module 1013. The filtering module 1014 is configured to control a voltage value of a low voltage side of the DC/DC converter to increase from an initial set value up to a target voltage value. Illustratively, the summing module 1013 is configured to control the voltage value of the low-voltage end of the DC/DC converter to be gradually increased from an initial set value to a target voltage value. Therefore, the initial set value is set in the filter module, the voltage value of the low-voltage end of the DC/DC converter controlled by the filter module is increased from the initial set value to the target voltage value, and compared with the situation that the voltage value of the low-voltage end of the DC/DC converter controlled by the filter module is increased from 0 to the target voltage value, the voltage increasing speed of the low-voltage storage battery is increased, and the voltage of the low-voltage storage battery is rapidly increased.
Optionally, with continuing reference to fig. 2, the control system of the DC/DC converter may further include: and a voltage limit value calculation unit 105 connected to the voltage value adjustment 101 unit. The voltage limit calculation unit 105 is configured to determine a voltage limit value of the low-voltage terminal of the DC/DC converter based on the charging voltage of the low-voltage battery. For example, the voltage limit value of the low-voltage side of the DC/DC converter is determined based on the highest charge voltage of the low-voltage battery.
Wherein the voltage limit calculation unit 105 is configured to determine the voltage limit value of the low-voltage side of the DC/DC converter based on the charging voltage of the low-voltage storage battery when the DC/DC converter is in the shock state (burk).
In a case where the control system of the DC/DC converter includes the voltage limit value calculation unit 105, the voltage value adjustment unit 101 may further include: a voltage limiting module 1015. The voltage limiting module 1015 is connected to the summing module 1013 and the filtering module 1014, respectively. The voltage limiting module 1015 is configured to obtain a voltage limit value of the low voltage end of the DC/DC converter, and update the target voltage value to the voltage limit value when the target voltage value is greater than the voltage limit value. Therefore, the output voltage of the low-voltage end of the DC/DC converter which can be output by the DC/DC converter control system is limited, the damage of the DC/DC converter caused by overhigh output voltage is avoided, and the protection of the DC/DC converter is realized. And the over-high voltage output by the low-voltage output end of the DC/DC converter is avoided, and the protection of the low-voltage storage battery is realized.
Optionally, with continuing reference to fig. 2, the control system of the DC/DC converter may further include: a state control unit 106 of the DC/DC converter. The State control unit 106 Of the DC/DC converter is configured to confirm a required operating State Of the DC/DC converter based on a vehicle powertrain State, a current operating State Of the DC/DC converter, an SOC Of a Battery Management System (BMS), and a State Of Health (SOH) and an engine on-off State Of the BMS. The required operating state is a vibration state (burk).
Illustratively, the state control unit 106 of the DC/DC converter is configured to determine that the required operating state of the DC/DC converter is a vibration state when the entire vehicle powertrain state is determined to be a ready state (ready state), the current operating state of the DC/DC converter is a no-fault state, the SOC of the BMS is greater than a second charge threshold, the SOH of the BMS is greater than a second target threshold, and the engine start-stop state is a non-start state. At this time, the voltage value adjusting unit 101 and the voltage limit value calculating unit 105 start operating.
In summary, in the control system of the DC/DC converter provided in the embodiment of the present invention, the voltage value setting unit determines the preset voltage value based on the current vehicle power system state, so that the voltage value adjusting unit can obtain the preset voltage value, and determine the target voltage value of the low-voltage end of the DC/DC converter based on the obtained preset voltage value, the first actual voltage value of the low-voltage end of the DC/DC converter, and the second actual voltage value of the low-voltage battery. Therefore, the state of the whole automobile power system can be considered in real time for determining the target voltage value of the low-voltage end of the DC/DC converter, the state of a storage battery (a low-voltage storage battery) is avoided being considered relatively singly, the control accuracy of the DC/DC converter is improved, and the balance of the energy of the whole automobile is realized to the maximum extent.
Furthermore, the target voltage value of the low-voltage end of the DC/DC converter can be determined in real time by considering the special working conditions of the automobile. And determining a preset voltage value according to the difference of the working conditions, and further obtaining target voltage values corresponding to different working conditions. The target voltage value is accurately determined, and therefore accurate utilization and maintenance of the energy of the low-voltage storage battery are achieved.
In addition, the voltage limit value calculating unit realizes the limit value of the output voltage of the low-voltage end of the DC/DC converter which can be output by the DC/DC converter control system, avoids the damage of overhigh output voltage to the DC/DC converter and realizes the protection of the DC/DC converter. And the over-high voltage output by the low-voltage output end of the DC/DC converter is also avoided, and the protection of the low-voltage storage battery is realized.
The control system of the DC/DC converter provided by the embodiment of the present invention can be applied to the control method of the DC/DC converter described below, and the working flows and the working principles of the respective components in the embodiment of the present invention can be mutually referred to the description in the respective embodiments below.
Referring to fig. 6, a method for controlling a DC/DC converter according to an embodiment of the present invention is shown. The method may be applied to the control system of the DC/DC converter described in fig. 1 or fig. 3. The device comprises a voltage value adjusting unit which can be connected with a DC/DC converter and a low-voltage storage battery respectively. The method comprises the following steps:
step 201, acquiring a preset voltage value of a low-voltage end of the DC/DC converter, a first actual voltage value of the low-voltage end of the DC/DC converter and a second actual voltage value of the low-voltage storage battery. The preset voltage value is determined based on the current vehicle powertrain state.
Wherein, the state of the automobile power system is used for indicating the state of the running condition of the automobile. Alternatively, the current vehicle powertrain state may be determined based on the target factors. The target factors include one or more of: the temperature of the DC/DC converter, the opening degree of an accelerator pedal, the fuel cut-off state of the engine, the start-stop state of the engine, the clutch state, the voltage of the low-voltage battery, the temperature of the low-voltage battery, the charge state of the low-voltage battery, or the health state of the low-voltage battery. For example, current vehicle powertrain conditions include one or more of: a quick charging state, a vulcanization protection state, a start-stop state or a pre-start state.
When the voltage of the low-voltage storage battery is lower than a first voltage threshold value, or the temperature of the DC/DC converter is lower than a first temperature threshold value, the opening degree of an accelerator pedal is larger than an opening degree threshold value, the fuel cut-off state of an engine is fuel cut-off, the clutch state is an open state or a slip film state, the temperature of the low-voltage storage battery is lower than a second temperature threshold value, the charge state of the low-voltage storage battery is smaller than a charge threshold value, and the health state of the low-voltage storage battery is in a target range, the current state of the automobile power system.
And when the voltage of the low-voltage storage battery is lower than a second voltage threshold, the temperature of the DC/DC converter is lower than a third temperature threshold and the temperature of the low-voltage storage battery is lower than a fourth temperature threshold, the current state of the automobile power system is a vulcanization protection state.
When the starting and stopping state of the engine is the starting and oil injection state, the current state of the automobile power system is the starting and stopping state.
When the starting and stopping state of the engine is a starting success state, the current state of the automobile power system is a pre-starting state.
In the embodiment of the invention, the states of the power system of the automobile can also comprise normal states. When the state of the automobile power system is in the quick charging state, the state of the automobile power system can be converted from the quick charging state to the normal state after a first preset time. When the state of the automobile power system is the vulcanization protection state, the state of the automobile power system can be converted from the vulcanization protection state to the normal state after a second preset time. When the state of the automobile power system is the start-stop state, the state of the automobile power system can be converted into the normal state from the start-stop state after the engine is stopped. And when the state of the automobile power system is in the pre-starting state, the state of the automobile power system can be converted from the pre-starting state to the normal state after a third preset time. For example, the first preset time period may be a time period consumed when the low-voltage battery is charged to a specified charge threshold. The second predetermined period of time may be calibrated based on characteristics of the low voltage battery. The third predetermined period of time may be determined based on the amount of power consumed during the start-up of the engine.
In the embodiment of the invention, the preset voltage value can be determined based on the current state of the automobile power system and the corresponding relation between the state of the automobile power system and the preset voltage value. For example, the preset voltage meter can be used for recording the corresponding relation between the state of the automobile power system and the preset voltage value. The preset voltage value corresponding to the current automobile power system state can be obtained by inquiring the preset voltmeter.
Step 202, determining a target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value and the second actual voltage value.
Optionally, the process of determining the target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value, and the second actual voltage value may include: and determining the small value of the preset voltage value and the first actual voltage value as a voltage value to be processed. And determining the difference value of the voltage value to be processed and the second actual voltage value. And determining the sum of the voltage value to be processed and the difference value as a target voltage value.
In an alternative implementation, after determining the sum of the voltage value to be processed and the difference value as the target voltage value, the voltage value adjusting unit may further control the voltage value of the low-voltage end of the DC/DC converter to increase from the initial set value to the target voltage value. For example, the voltage value adjusting unit may control the voltage value of the low-voltage terminal of the DC/DC converter to be gradually increased from an initial set value to a target voltage value. Therefore, the voltage value of the low-voltage end of the DC/DC converter is increased from the initial set value to the target voltage value, and compared with the situation that the voltage value of the low-voltage end of the DC/DC converter is increased from 0 to the target voltage value, the voltage boosting speed of the low-voltage storage battery is increased, and the voltage of the low-voltage storage battery is boosted quickly.
In the embodiment of the present invention, after determining the sum of the voltage value to be processed and the difference value as the target voltage value, the voltage value adjusting unit may further obtain a voltage limit value of the low-voltage end of the DC/DC converter. The voltage limit value is determined based on the charging voltage of the low-voltage battery. When the target voltage value is larger than the voltage limit value, the voltage value adjusting unit updates the target voltage value to be the voltage limit value. Therefore, the voltage which can be output by the low-voltage end of the DC/DC converter is limited, the damage to the DC/DC converter caused by overhigh output voltage is avoided, and the protection of the DC/DC converter is realized. And the over-high voltage output by the low-voltage output end of the DC/DC converter is avoided, and the protection of the low-voltage storage battery is realized.
In summary, in the control method of the DC/DC converter provided in the embodiment of the present invention, the preset voltage value determined based on the current vehicle power system state is obtained, and the obtained preset voltage value, the first actual voltage value of the low-voltage end of the DC/DC converter, and the second actual voltage value of the low-voltage battery are obtained. And determining a target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value and the second actual voltage value. Therefore, the state of the whole automobile power system can be considered in real time for determining the target voltage value of the low-voltage end of the DC/DC converter, the state of a storage battery (a low-voltage storage battery) is avoided being considered relatively singly, the control accuracy of the DC/DC converter is improved, and the balance of the energy of the whole automobile is realized to the maximum extent.
Furthermore, the target voltage value of the low-voltage end of the DC/DC converter can be determined in real time by considering the special working conditions of the automobile. And determining a preset voltage value according to the difference of the working conditions, and further obtaining target voltage values corresponding to different working conditions. The target voltage value is accurately determined, and therefore accurate utilization and maintenance of the energy of the low-voltage storage battery are achieved.
In addition, the voltage limit value calculating unit realizes the limit value of the output voltage of the low-voltage end of the DC/DC converter which can be output by the DC/DC converter control system, avoids the damage of overhigh output voltage to the DC/DC converter and realizes the protection of the DC/DC converter. And the over-high voltage output by the low-voltage output end of the DC/DC converter is also avoided, and the protection of the low-voltage storage battery is realized.
Referring to fig. 7, a control device of a DC/DC converter according to an embodiment of the present invention is shown. The device can be applied to a voltage value adjustment unit connected to a DC/DC converter and a low-voltage battery, respectively. As shown in fig. 7, the apparatus 300 includes:
the acquiring module 301 is configured to acquire a preset voltage value of the low-voltage end of the DC/DC converter, a first actual voltage value of the low-voltage end of the DC/DC converter, and a second actual voltage value of the low-voltage battery, where the preset voltage value is determined based on a current state of the vehicle power system.
The determining module 302 is configured to determine a target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value, and the second actual voltage value.
In an alternative approach, the current vehicle powertrain state is determined based on target factors including one or more of: the temperature of the DC/DC converter, the opening degree of an accelerator pedal, the fuel cut-off state of the engine, the start-stop state of the engine, the clutch state, the voltage of the low-voltage battery, the temperature of the low-voltage battery, the charge state of the low-voltage battery, or the health state of the low-voltage battery.
In an alternative approach, the current vehicle powertrain state includes one or more of: a quick charging state, a vulcanization protection state, a start-stop state or a pre-start state.
When the voltage of the low-voltage storage battery is lower than a first voltage threshold value, or the temperature of the DC/DC converter is smaller than a first temperature threshold value, the opening degree of an accelerator pedal is larger than an opening degree threshold value, the fuel cut-off state of an engine is fuel cut-off, the clutch state is an open state or a slip film state, the temperature of the low-voltage storage battery is smaller than a second temperature threshold value, the charge state of the low-voltage storage battery is smaller than a charge threshold value, and the health state of the low-voltage storage battery is in a target range, the current state of the automobile power system;
when the voltage of the low-voltage storage battery is lower than a second voltage threshold, the temperature of the DC/DC converter is lower than a third temperature threshold and the temperature of the low-voltage storage battery is lower than a fourth temperature threshold, the current state of the automobile power system is a vulcanization protection state;
when the starting and stopping state of the engine is a starting oil injection state, the current state of the automobile power system is a starting and stopping state;
when the starting and stopping state of the engine is a starting success state, the current state of the automobile power system is a pre-starting state.
In an alternative mode, the preset voltage value is determined based on the current vehicle power system state and the corresponding relationship between the vehicle power system state and the preset voltage value.
In an optional manner, the determining module 302 is further configured to: determining the small value of the preset voltage value and the first actual voltage value as a voltage value to be processed; determining a difference value between the voltage value to be processed and the second actual voltage value; and determining the sum of the voltage value to be processed and the difference value as a target voltage value.
In an optional manner, the apparatus further comprises: and the control module is used for controlling the voltage value of the low-voltage end of the DC/DC converter to increase from the initial set value to the target voltage value.
In an optional manner, the apparatus further comprises: the acquisition module is used for acquiring a voltage limit value of a low-voltage end of the DC/DC converter, and the voltage limit value is determined based on the charging voltage of the low-voltage storage battery; and the updating module is used for updating the target voltage value to be the voltage limit value when the target voltage value is greater than the voltage limit value.
In summary, in the control apparatus of the DC/DC converter provided in the embodiment of the present invention, the obtaining module obtains the preset voltage value determined based on the current vehicle power system state, and the obtained preset voltage value, the first actual voltage value of the low-voltage end of the DC/DC converter, and the second actual voltage value of the low-voltage battery. The determination module is used for determining a target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value and the second actual voltage value. Therefore, the state of the whole automobile power system can be considered in real time for determining the target voltage value of the low-voltage end of the DC/DC converter, the state of a storage battery (a low-voltage storage battery) is avoided being considered relatively singly, the control accuracy of the DC/DC converter is improved, and the balance of the energy of the whole automobile is realized to the maximum extent.
An embodiment of the present invention further provides an automobile, where the automobile includes a control system of the DC/DC converter shown in any one of fig. 1 to 5.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A method for controlling a DC/DC converter, the method being applied to a voltage value adjusting unit connected to the DC/DC converter and a low-voltage battery, respectively, the method comprising:
acquiring a preset voltage value of a low-voltage end of the DC/DC converter, a first actual voltage value of the low-voltage end of the DC/DC converter and a second actual voltage value of the low-voltage storage battery, wherein the preset voltage value is determined based on the current state of the automobile power system;
and determining a target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value and the second actual voltage value.
2. The method of claim 1, wherein the current vehicle powertrain state is determined based on target factors including one or more of: the temperature of the DC/DC converter, the opening degree of an accelerator pedal, the fuel cut-off state of an engine, the start-stop state of the engine, the state of a clutch, the voltage of the low-voltage storage battery, the temperature of the low-voltage storage battery, the charge state of the low-voltage storage battery or the health state of the low-voltage storage battery.
3. The method of claim 2, wherein the current vehicle powertrain state comprises one or more of: a quick charging state, a vulcanization protection state, a start-stop state or a pre-start state;
when the voltage of the low-voltage storage battery is lower than a first voltage threshold value, or the temperature of the DC/DC converter is smaller than a first temperature threshold value, the opening degree of an accelerator pedal is larger than an opening degree threshold value, the fuel cut state of the engine is fuel cut, the clutch state is an open state or a slip film state, the temperature of the low-voltage storage battery is smaller than a second temperature threshold value, the charge state of the low-voltage storage battery is smaller than a charge threshold value, and the health state of the low-voltage storage battery is in a target range, the current state of the automobile power system is in the quick charge state;
when the voltage of the low-voltage storage battery is lower than a second voltage threshold, the temperature of the DC/DC converter is lower than a third temperature threshold, and the temperature of the low-voltage storage battery is lower than a fourth temperature threshold, the current automobile power system state is the vulcanization protection state;
when the starting and stopping state of the engine is a starting oil injection state, the current state of the automobile power system is the starting and stopping state;
and when the starting and stopping state of the engine is a starting success state, the current state of the automobile power system is the pre-starting state.
4. The method of claim 1, wherein the predetermined voltage value is determined based on the current vehicle powertrain state and a correspondence of vehicle powertrain state to predetermined voltage value.
5. The method according to any one of claims 1 to 4, wherein the determining a target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value and the second actual voltage value comprises:
determining the small value of the preset voltage value and the first actual voltage value as a voltage value to be processed;
determining a difference value between the voltage value to be processed and the second actual voltage value;
and determining the sum of the voltage value to be processed and the difference value as a target voltage value.
6. The method according to any one of claims 1-4, further comprising:
and controlling the voltage value of the low-voltage end of the DC/DC converter to increase from an initial set value to the target voltage value.
7. The method according to any one of claims 1-4, further comprising:
acquiring a voltage limit value of a low-voltage end of the DC/DC converter, wherein the voltage limit value is determined based on the charging voltage of the low-voltage storage battery;
and when the target voltage value is larger than the voltage limit value, updating the target voltage value to be the voltage limit value.
8. A control system for a DC/DC/DC converter, the system comprising:
the voltage value adjusting unit and the voltage value setting unit are connected with the voltage value adjusting unit;
the voltage value setting unit is configured to determine a preset voltage value of a low-voltage end of the DC/DC converter based on the current state of the automobile power system;
the voltage value adjusting unit is configured to acquire the preset voltage value, a first actual voltage value of a low-voltage end of the DC/DC converter, and a second actual voltage value of a low-voltage storage battery, and determine a target voltage value of the low-voltage end of the DC/DC converter based on the preset voltage value, the first actual voltage value, and the second actual voltage value.
9. The system of claim 8, further comprising: the special working condition calculation unit is connected with the voltage value setting unit;
the special case calculation unit is configured to determine a current vehicle powertrain state based on target factors including one or more of: the temperature of the DC/DC converter, the opening degree of an accelerator pedal, the fuel cut-off state of an engine, the start-stop state of the engine, the state of a clutch, the voltage of the low-voltage battery, the temperature of the low-voltage battery, the state of charge of the low-voltage battery, or the state of health of the low-voltage battery.
10. The system according to claim 8 or 9, characterized in that the system further comprises: the voltage limit value calculation unit is connected with the voltage value adjustment unit;
the voltage limit calculation unit is configured to determine a voltage limit value of a low-voltage side of the DC/DC converter based on a charging voltage of the low-voltage battery.
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