CN112583068B - 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 PDFInfo
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- CN112583068B CN112583068B CN202011218549.XA CN202011218549A CN112583068B CN 112583068 B CN112583068 B CN 112583068B CN 202011218549 A CN202011218549 A CN 202011218549A CN 112583068 B CN112583068 B CN 112583068B
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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
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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
- H02J7/0047—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]
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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
- H02J7/0047—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]
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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
- H02J7/007188—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
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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
- H02J7/14—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)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Secondary Cells (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 direct current/direct current (DC/DC) converter is applied to a voltage value adjusting unit respectively connected with the DC/DC converter and a low-voltage storage battery, and comprises the following steps: 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 a 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
Technical Field
The invention relates to the technical field of automobiles, in particular to a control method and a 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 automobiles, a Direct Current/Direct Current (DC/DC or DCDC) converter is an important component for maintaining the normal operation of a low-voltage loop of the automobile. The function of the power supply is to convert the high voltage input by a power source such as a high-voltage battery and a generator into the low voltage required by a low-voltage load such as a storage battery. The battery is charged by controlling the output voltage of the low voltage terminal (output terminal) 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 charge state of the battery, so that the battery can supply power to the whole automobile at a low voltage, and the control accuracy of the DC/DC converter is low.
Disclosure of Invention
In view of the above, the present invention is directed to a control method and system for a DC/DC converter, so as to solve the problem of low control accuracy of the DC/DC converter.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a control method of 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 a 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 target factors including one or more of: the temperature of the DC/DC converter, the opening degree of an accelerator pedal, the fuel cut state of an engine, the start-stop state of the engine, the clutch state, 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.
Further, the current vehicle powertrain state includes one or more of the following: a fast charge 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 the accelerator pedal is larger than an opening degree threshold value, the oil-cut state of the engine is oil-cut, 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 lower than a charge threshold value, and the health state of the low-voltage storage battery is in a target range, the current automobile power system state is a fast 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 start-stop state of the engine is a start-up oil injection state, the current automobile power system state is a start-stop state;
and when the starting and stopping state of the engine is a successful starting state, the current automobile power system state is a pre-starting state.
Further, the preset voltage value is determined based on the current vehicle power system state and a correspondence between the vehicle power system state and the preset voltage value.
Further, the determining, based on the preset voltage value, the first actual voltage value, and the second actual voltage value, a target voltage value of a low voltage end of the DC/DC converter includes:
determining that the average value of the preset voltage value and the first actual voltage value is small 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 be increased from an initial set value to the target voltage value.
Further, the method further comprises:
acquiring a voltage limiting value of a low-voltage end of the DC/DC converter, wherein the voltage limiting value is determined based on a charging voltage of the low-voltage storage battery;
and when the target voltage value is larger than the voltage limiting value, updating the target voltage value to the voltage limiting value.
Another object of the present invention is to provide a control system for a DC/DC converter, where the technical scheme of the present invention is as follows:
a control system for a DC/DC converter, the system comprising:
a voltage value adjusting unit and a voltage value setting unit 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 automobile power system state;
the voltage value adjustment 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 calculating unit is connected with the voltage value setting unit; the special condition 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 state of an engine, the start-stop state of the engine, the clutch state, 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.
Further, the system further comprises: a voltage limit value calculation unit connected to the voltage value adjustment unit; the voltage limit calculation unit is configured to determine a voltage limit value of a low-voltage end of the DC/DC converter based on a charging voltage of the low-voltage storage battery.
The invention also aims at providing an automobile, and the technical scheme of the invention is realized as follows: an automobile comprising a control system of any one of the DC/DC converters provided by the invention.
According to the control method and system for 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 by determining the target voltage value of the low-voltage end of the DC/DC converter, the state of a storage battery (low-voltage storage battery) is prevented from being considered singly, the control accuracy of the DC/DC converter is improved, and the balance of the whole automobile energy is realized to the maximum extent.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain 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 structural 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 an automotive powertrain according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of determining power consumption for starting 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 flow chart 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, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1, a schematic diagram of a control system of a DC/DC converter according to an embodiment of the invention is shown. As shown in fig. 1, the control system may include:
voltage value adjusting section 101 and voltage value setting section 102 connected to voltage value adjusting section 101. The voltage value setting unit 102 is configured to determine a preset voltage value based on the current vehicle powertrain state. The automobile power system state 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 the low voltage terminal of the DC/DC converter, and a second actual voltage value of the low voltage battery. A target voltage value of the low voltage end of the DC/DC converter is determined based on the preset voltage value, the first actual voltage value and the second actual voltage value.
Wherein 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 end (high voltage end) of the DC/DC converter is connected with the motor and the high voltage battery, and the output end (low voltage end) of the DC/DC converter is connected with the low voltage load. Wherein the low voltage load may comprise: a low voltage battery. The motor can be an integrated machine (Belt-Driven Starter Generator, BSG) which utilizes Belt transmission to take account of starting and generating, and is also called as a BSG motor.
According to the control system of the DC/DC converter, the voltage value setting unit is used for determining the preset voltage value based on the current automobile power system state, so that the voltage value adjusting unit can acquire the preset voltage value, and the target voltage value of the low-voltage end of the DC/DC converter is determined based on the acquired 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 (low-voltage storage battery) is prevented from being considered singly, the control accuracy of the DC/DC converter is improved, and the balance of the whole automobile energy 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 powertrain state and the correspondence between the vehicle powertrain state and the preset voltage value. For example, the voltage value setting unit 102 may store a preset voltmeter that records a correspondence between a state of the power system of the automobile and a preset voltage value. The voltage value setting unit 102 may obtain a preset voltage value corresponding to the current state of the power system of the automobile 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 special conditions that may occur with the vehicle are, for example, engine start-stop, energy recovery, long-term vehicle placement, etc. Then in an embodiment of the invention, the vehicle powertrain status may include one or more of the following: a fast charge state, a vulcanization protection state, a start-stop state, a pre-start state (also called a post-start state) and a normal state. The fast charge state refers to a state in which the automobile is rapidly charged into the low-voltage storage battery. The vulcanization protection 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 correspondence between the automobile power system state and the preset voltage value may include: the quick charge 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.
The first preset voltage value can be a higher voltage value so as to meet the requirement of the automobile on the quick charge of the low-voltage storage battery under the condition that the electric quantity of the power battery is lower and the electric quantity of the low-voltage storage battery and the electric quantity of the power battery are allowed. The second preset voltage value may be a lower voltage value, so as to realize sulfuration protection of the low-voltage storage battery when the states of the low-voltage storage battery and the DC/DC converter are poor. The second preset voltage value may be calibrated based on the low voltage battery characteristics. The third preset voltage value may be a higher voltage value, so as to implement rapid charging of the low-voltage battery when the power consumption of the low-voltage battery is greater after the engine is started. The fourth preset voltage value may be a lower voltage value to meet a requirement for power battery power 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: the normal voltage value calculation unit 103. The normal voltage value calculation module 103 is connected to the voltage value setting unit 102. The normal voltage value calculating unit 103 is configured to determine that the state of the power system of the automobile 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 calculating unit 103 is configured to determine a voltage value corresponding to the current SOC and the current temperature, which is a fifth preset voltage value, based on the current SOC of the low-voltage battery, the current temperature of the low-voltage battery, and the correspondence relationship of the SOC, the temperature, and the voltage value of the low-voltage battery. The normal voltage value calculating unit 103 may record the corresponding relationship between the SOC, the temperature, and the voltage value of the low-voltage battery through a normal voltage correspondence table.
In the embodiment of the present invention, the normal voltage value calculating 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 an effective state and the temperature of the low-voltage battery is in an effective state. It can be understood that: the normal voltage value calculating unit 103 determines a fifth preset voltage value based on the SOC of the low-voltage battery, the temperature, the SOC state of the low-voltage battery, and the temperature state.
Further, referring to fig. 2, the control system of the DC/DC converter may further include: the special condition calculating unit 104 is connected to the voltage value setting unit 102. The special operating condition 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 following: 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 SOC of the low-voltage battery, or the state of health of the low-voltage battery.
In the embodiment of the invention, the state of the automobile power system comprises a quick charge state, a vulcanization protection state, a start-stop state and a pre-start state. When the driver releases the throttle so that the vehicle is coasting and the engine is still running, the vehicle powertrain state may be determined to be a fast charge state. A certain period of time after the successful start (start-up completion) of the transmitter may determine that the vehicle powertrain state is a pre-start state. 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 calculating unit 104 is configured to acquire a temperature of the DC/DC converter, an opening degree of the accelerator pedal, a fuel cut state of the engine, a start-stop state of the engine, a clutch state, a voltage of the low-voltage battery, a temperature of the low-voltage battery, a state of charge of the low-voltage battery, or a state of health of the low-voltage battery.
And determining that the current automobile power system state is a fast charge state when the voltage of the low-voltage storage battery is lower than a first voltage threshold, or the temperature of the DC/DC converter is lower than a first temperature threshold, the opening degree of the accelerator pedal is higher than an opening degree threshold, 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, the charge state of the low-voltage storage battery is lower than a charge threshold and the health state of the low-voltage storage battery is in a target range.
And when the voltage of the low-voltage storage battery is lower than the second voltage threshold, the temperature of the DC/DC converter is lower than the third temperature threshold and the temperature of the low-voltage storage battery is lower than the fourth temperature threshold, determining that the current automobile power system state is a vulcanization protection state.
And when the start-stop state of the engine is a start-oil injection state, determining that the current state of the automobile power system is the start-stop state.
When the start-stop state of the engine is a successful start-up state, determining that the current power system state of the automobile is in a pre-start state.
Further, the vehicle powertrain state also includes a normal state. The special operating mode calculating unit 104 is further configured to determine that the state of the vehicle powertrain is changed from the fast-charge state to the normal state after the first preset period of time when the state of the vehicle powertrain is the fast-charge state. 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 the second preset time period. When the state of the automobile power system is a start-stop state, the state of the automobile power system is determined to be converted from the start-stop state to a normal state after the engine is stopped. When the state of the automobile power system is the pre-starting state, determining that the state of the automobile power system is converted from the pre-starting state to the normal state after the third preset time period. The first preset time period may be, for example, a time period consumed when the low-voltage battery is charged to a specified charge threshold. The second preset time period may be calibrated according to characteristics of the low-voltage battery. The third predetermined time period may be determined based on power consumption during cranking.
Optionally, the third preset duration may be determined based on a duration of consumption of power consumption during the cranking. For example, the third preset time period may be a time period during which the power consumption for starting is calculated based on the current of the low-voltage battery and the start-stop state of the engine, wherein the power consumption for starting may be determined based on an ampere-hour integration method.
Fig. 4 is a schematic diagram of determining a starting power consumption according to an embodiment of the present invention. And determining the starting power consumption in the starting process of the transmitter through a starting power consumption calculation module. The starting power consumption calculation module may be a module of the special working condition calculation unit 104 or may be an independent module. The starting power consumption calculation module comprises: reset/set Latch (SR-Latch), conditional constructor (criterion) u2, enable Latch (Enablelatch) En_latch, divider x0:0, adder sum1, inverter NOT, and ZERO controller CON_ZERO_C for outputting 0. The reset/set latch includes two inputs, a reset (reset) terminal rs and a set terminal set, and a latch output terminal L1. Both input ends are used for inputting the time sequence signals corresponding to the start-stop state of the engine. The reset signal at the reset terminal is a rising edge (rising_edge) signal. The condition constructor u2 comprises 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 judging process (criterion: u2 to=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; when the value of the condition input terminal is equal to 0, the result output terminal outputs the value of the second value input terminal. The latch output is connected to the condition input. The enable latch includes a set input, an enable input, and a latch output. The set input end is connected with the result output end, the enable input end is connected with the inverter and is used for inputting a time sequence signal corresponding to the start-stop state of the engine. The latch output end is used for outputting the starting consumed electric quantity. And two input ends of the adder are used for inputting 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 constructor. The input end of the divider is connected with the result output end of the condition constructor. The value of the reset/set latch output is not equal to 0 during engine start. At this time, the condition constructor outputs an integrated accumulated value of the battery current, and the latch is enabled to output the integrated accumulated value. Then the third preset time period may be a time period that enables the latch to output the continuously changing integrated accumulated 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 adjustment unit 101 may further include: a decimating module 1011, a decimating module 1012 and a summing module 1013. The decimating module 1011 is connected to the decimating module 1012 and the summing module 1013, respectively. The scaling module 1011 is configured to determine that the preset voltage value at the low voltage end of the DC/DC converter and the value in the first actual voltage value at the low voltage end of the DC/DC converter are smaller as the voltage value to be processed. The difference module 1012 is configured to determine a difference between the voltage value to be processed and the second actual voltage value. The summing module 1013 is configured to determine a 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 coupled to the summing module 1013. The filter module 1014 is configured to control the voltage value of the low voltage terminal of the DC/DC converter to increase from an initial set point 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 gradually increase from an initial set point to a target voltage value. In this way, the initial set value is set in the filtering module, so that the voltage value of the low-voltage end of the DC/DC converter can be controlled by the filtering module to be increased from the initial set value to the target voltage value, and compared with the voltage value of the low-voltage end of the DC/DC converter which is controlled by the filtering module to be increased from 0 to the target voltage value, the voltage boosting speed of the low-voltage storage battery is improved, and the rapid voltage boosting of the low-voltage storage battery voltage is realized.
Optionally, referring to fig. 2, the control system of the DC/DC converter may further include: voltage limit value calculation section 105 connected to voltage value adjustment section 101. 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 charging voltage of the low voltage battery.
Wherein 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 when the DC/DC converter is in a vibration state (burk).
In the 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: and 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 whole DC/DC converter control system is limited, the damage to the DC/DC converter caused by overhigh output voltage is avoided, and the protection to the DC/DC converter is realized. And the output of the over-high voltage at the low-voltage output end of the DC/DC converter is avoided, and the protection of the low-voltage storage battery is realized.
Optionally, referring 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 operation State Of the DC/DC converter based on a State Of the entire vehicle power system, a current operation State Of the DC/DC converter, an SOC Of a battery management system (Battery Management System, BMS), and a State Of Health (SOH) Of the BMS, and an engine on-off State. The desired operating condition is a vibration condition (burk).
For example, the state control unit 106 of the DC/DC converter is configured to determine that the required operation state of the DC/DC converter is a vibration state when it is determined that the state of the entire vehicle power system is a ready state (ready state), the current operation state of the DC/DC converter is a fault-free state, the SOC of the BMS is greater than the second charge threshold, the SOH of the BMS is greater than the 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 to operate.
In summary, in the control system for a DC/DC converter according to the embodiment of the present invention, the voltage value setting unit determines the preset voltage value based on the current state of the vehicle power system, so that the voltage value adjusting unit may 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 by determining the target voltage value of the low-voltage end of the DC/DC converter, the state of a storage battery (low-voltage storage battery) is prevented from being considered singly, the control accuracy of the DC/DC converter is improved, and the balance of the whole automobile energy is realized to the maximum extent.
Further, the determination of the target voltage value of the low-voltage end of the DC/DC converter can consider the special working condition of the automobile in real time. And determining a preset voltage value according to the difference of the working conditions, so as to obtain target voltage values corresponding to different working conditions. The method accurately realizes the determination of the target voltage value, and further realizes the accurate utilization and maintenance of the energy of the low-voltage storage battery.
And the voltage limit value calculation unit is used for realizing the limit value of the output voltage of the low-voltage end of the DC/DC converter which can be output by the whole DC/DC converter control system, avoiding the damage to the DC/DC converter caused by overhigh output voltage and realizing the protection to the DC/DC converter. And the output of the excessive high voltage at the low-voltage output end of the DC/DC converter is 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 may be applied to the control method of the DC/DC converter described below, and the workflow and the working principle of each component in the embodiment of the present invention may be referred to with the descriptions in the embodiments below.
Referring to fig. 6, a control method of a DC/DC converter according to an embodiment of the 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 has 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, obtaining 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.
The automobile power system state is used for indicating the running condition state of the automobile. Alternatively, the current vehicle powertrain state may be determined based on a target factor. The target factors include one or more of the following: the temperature of the DC/DC converter, the opening degree of the 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 state of charge of the low-voltage battery, or the state of health of the low-voltage battery. By way of example, the current vehicle powertrain state includes one or more of the following: a fast charge 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, or the temperature of the DC/DC converter is lower than a first temperature threshold, the opening degree of the accelerator pedal is higher than an opening degree threshold, 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, the charge state of the low-voltage storage battery is lower than a charge threshold, and the health state of the low-voltage storage battery is in a target range, the current automobile power system state is a fast charge state.
When the voltage of the low-voltage storage battery is lower than the second voltage threshold, the temperature of the DC/DC converter is lower than the third temperature threshold and the temperature of the low-voltage storage battery is lower than the fourth temperature threshold, the current automobile power system state is in a vulcanization protection state.
When the start-stop state of the engine is a start-oil injection state, the current state of the automobile power system is a start-stop state.
When the start-stop state of the engine is a successful start-up state, the current automobile power system state is a pre-start-up state.
In the embodiment of the invention, the state of the automobile power system can also comprise a normal state. When the state of the automobile power system is the fast charge state, the state of the automobile power system can be converted from the fast charge state to the normal state after the first preset time period. 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 the second preset time period. When the state of the automobile power system is a start-stop state, the state of the automobile power system can be converted from the start-stop state to a normal state after the engine is stopped. When the state of the automobile power system is the pre-starting state, the state of the automobile power system can be converted from the pre-starting state to the normal state after the third preset time period. The first preset time period may be, for example, a time period consumed when the low-voltage battery is charged to a specified charge threshold. The second preset time period may be calibrated according to characteristics of the low-voltage battery. The third predetermined time period may be determined based on power consumption during cranking.
In the embodiment of the invention, the preset voltage value can be determined based on the current automobile power system state and the corresponding relation between the automobile power system state and the preset voltage value. For example, the preset voltmeter may be used to record a correspondence between a state of an automobile power system and a preset voltage value. The preset voltage value corresponding to the current automobile power system state can be obtained by inquiring the preset voltage meter.
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 that the average value of the preset voltage value and the first actual voltage value is small as a voltage value to be processed. And 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 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 adjustment unit may further control the voltage value of the low voltage terminal of the DC/DC converter to increase from the initial set value up 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 gradually increase from the initial set value to the target voltage value. In this way, 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 voltage value of the low-voltage end of the DC/DC converter is increased from 0 to the target voltage value, the voltage increasing speed of the low-voltage storage battery is improved, and the rapid voltage increasing of the low-voltage storage battery is realized.
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 adjustment unit may further obtain a voltage limiting value of the low voltage end of the DC/DC converter. The voltage limit value is determined based on a charging voltage of the low-voltage battery. When the target voltage value is larger than the voltage limiting value, the voltage value adjusting unit updates the target voltage value to the voltage limiting 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 the overhigh output voltage is avoided, and the protection of the DC/DC converter is realized. And the output of the over-high voltage at 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, according to the control method for the DC/DC converter provided by the embodiments of the present invention, the preset voltage value determined based on the current state of the vehicle power system 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 by determining the target voltage value of the low-voltage end of the DC/DC converter, the state of a storage battery (low-voltage storage battery) is prevented from being considered singly, the control accuracy of the DC/DC converter is improved, and the balance of the whole automobile energy is realized to the maximum extent.
Further, the determination of the target voltage value of the low-voltage end of the DC/DC converter can consider the special working condition of the automobile in real time. And determining a preset voltage value according to the difference of the working conditions, so as to obtain target voltage values corresponding to different working conditions. The method accurately realizes the determination of the target voltage value, and further realizes the accurate utilization and maintenance of the energy of the low-voltage storage battery.
And the voltage limit value calculation unit is used for realizing the limit value of the output voltage of the low-voltage end of the DC/DC converter which can be output by the whole DC/DC converter control system, avoiding the damage to the DC/DC converter caused by overhigh output voltage and realizing the protection to the DC/DC converter. And the output of the excessive high voltage at the low-voltage output end of the DC/DC converter is 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 invention is shown. The device can be applied to a voltage value adjusting unit connected to the DC/DC converter and the low-voltage battery, respectively. As shown in fig. 7, the apparatus 300 includes:
the obtaining module 301 is configured to obtain 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.
A determining module 302, 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 one alternative, the current vehicle powertrain state is determined based on target factors including one or more of the following: the temperature of the DC/DC converter, the opening degree of the 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 state of charge of the low-voltage battery, or the state of health of the low-voltage battery.
In one alternative, the current vehicle powertrain state includes one or more of the following: a fast charge 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 the accelerator pedal is higher 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 lower than a charge threshold value, and the health state of the low-voltage storage battery is in a target range, the current automobile power system state is a fast 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 start-stop state of the engine is a start-oil injection state, the current state of the automobile power system is a start-stop state;
when the start-stop state of the engine is a successful start-up state, the current automobile power system state is a pre-start-up state.
In an alternative, the preset voltage value is determined based on the current vehicle powertrain state and a correspondence of the vehicle powertrain state to the preset voltage value.
In an alternative way, the determining module 302 is further configured to: determining that the value in the preset voltage value and the first actual voltage value is small 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 alternative, 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 be increased from the initial set value to the target voltage value.
In an alternative, the apparatus further comprises: the acquisition module is used for acquiring a voltage limiting value of a low-voltage end of the DC/DC converter, wherein the voltage limiting 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 limiting value when the target voltage value is larger than the voltage limiting value.
In summary, according to the control device for a DC/DC converter provided by the embodiments of the present invention, the obtaining module obtains the preset voltage value determined based on the current state of the power system of the vehicle, 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 determining module is used for determining a target voltage value of a 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 by determining the target voltage value of the low-voltage end of the DC/DC converter, the state of a storage battery (low-voltage storage battery) is prevented from being considered singly, the control accuracy of the DC/DC converter is improved, and the balance of the whole automobile energy is realized to the maximum extent.
The embodiment of the invention also provides an automobile, which comprises the control system of the DC/DC converter shown in any one of the figures 1 to 5.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. A control method of 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 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 an automobile power system;
determining a target voltage value of a 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, including:
determining that the average value of the preset voltage value and the first actual voltage value is small 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.
2. The method of claim 1, wherein the current vehicle powertrain state is determined based on a target factor comprising 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 clutch state, 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 automotive powertrain state comprises one or more of: a fast charge 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, or the temperature of the DC/DC converter is lower than a first temperature threshold, the opening degree of the accelerator pedal is larger than an opening degree threshold, the oil-cut state of the engine is oil-cut, 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, the charge state of the low-voltage storage battery is lower than a charge threshold, and the health state of the low-voltage storage battery is in a target range, the current automobile power system state is the fast 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 start-stop state of the engine is a start-up oil injection state, the current automobile power system state is the start-stop state;
and when the starting and stopping state of the engine is a successful starting state, the current automobile power system state 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 the vehicle powertrain state to the predetermined voltage value.
5. The method of any one of claims 1-4, further comprising:
and controlling the voltage value of the low-voltage end of the DC/DC converter to be increased from an initial set value to the target voltage value.
6. The method of any one of claims 1-4, further comprising:
acquiring a voltage limiting value of a low-voltage end of the DC/DC converter, wherein the voltage limiting value is determined based on a charging voltage of the low-voltage storage battery;
and when the target voltage value is larger than the voltage limiting value, updating the target voltage value to the voltage limiting value.
7. A control system for a DC/DC converter, the system comprising:
a voltage value adjusting unit and a voltage value setting unit 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 automobile power system state;
the voltage value adjusting unit is configured to obtain 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, 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, and include determining that a value of the preset voltage value and the first actual voltage value is smaller 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.
8. The system of claim 7, wherein the system further comprises: the special working condition calculating unit is connected with the voltage value setting unit;
the special condition 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 state of an engine, the start-stop state of the engine, the clutch state, 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.
9. The system according to claim 7 or 8, characterized in that the system further comprises: a voltage limit value calculation unit connected to the voltage value adjustment unit;
the voltage limit calculation unit is configured to determine a voltage limit value of a low-voltage end of the DC/DC converter based on a charging voltage of the low-voltage storage battery.
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| CN202011218549.XA CN112583068B (en) | 2020-11-04 | 2020-11-04 | Control method and system of direct current/direct current (DC/DC) converter |
| PCT/CN2021/127943 WO2022095833A1 (en) | 2020-11-04 | 2021-11-01 | Control method and system for dc/dc converter |
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| WO2023015433A1 (en) * | 2021-08-10 | 2023-02-16 | 宁波吉利罗佑发动机零部件有限公司 | Dcdc output voltage control method and control system for hybrid vehicle |
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