CN112087037A - Charging control system and control method - Google Patents
Charging control system and control method Download PDFInfo
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- CN112087037A CN112087037A CN202011058047.5A CN202011058047A CN112087037A CN 112087037 A CN112087037 A CN 112087037A CN 202011058047 A CN202011058047 A CN 202011058047A CN 112087037 A CN112087037 A CN 112087037A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a charging control system and a charging control method. When a vehicle starting signal is received and high-voltage electrification is needed, the controller controls the working states of the positive relay, the negative relay and the direct current-direct current converter, so that the low-voltage storage battery can carry out pre-charging on the capacitor, the pre-charging relay and the pre-charging resistor are not needed, the cost and the system complexity are reduced, and the system reliability is improved.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a charging control system and a charging control method.
Background
Before starting, the electric automobile needs to be electrified at high voltage, and in order to prevent the bus capacitor and the electric appliance from being damaged due to the fact that the high voltage of a power battery is directly loaded to the bus end of the external-end high-voltage electric appliance, the voltage needs to be slowly loaded to the bus end of the electric appliance. At present, an electric vehicle is realized by designing a dedicated pre-charging circuit, as shown in fig. 1, the existing pre-charging circuit for an electric vehicle includes a power battery BT ', a positive electrode relay S1' disposed at the positive electrode end of an outer-end high-voltage bus, a negative electrode relay S2 'disposed at the negative electrode end of the outer-end high-voltage bus, a pre-charging relay S3', a pre-charging resistor R ', a capacitor C', and a high-voltage load, the high-voltage load includes a motor, a Direct-Current (DC-DC) converter, the capacitor C 'is connected between the positive electrode and the negative electrode of the outer-end high-voltage bus, the high-voltage battery BT', the positive electrode relay S1 'and the negative electrode relay S2' are sequentially connected in series to form a main charging circuit, the high-voltage battery BT ', the pre-charging relay S3', the pre-charging resistor R 'and the negative electrode relay S2' are sequentially connected in, the pre-charging relay S3 'and the negative relay S2' are closed, the positive relay S1 'is disconnected, the pre-charging circuit is activated to enter a working state, the power battery BT' charges the capacitor C 'through the pre-charging resistor R', the voltage at two ends of the capacitor C 'slowly rises, and meanwhile the pre-charging resistor R' limits the pre-charging current within a safety range, so that the effect of slowly rising the voltage is achieved.
The existing electric automobile pre-charging circuit at least needs one pre-charging resistor and one pre-charging relay, so that the cost of a bicycle is increased, the difficulty is increased for the space arrangement of a battery pack, and if the pre-charging resistor R ' is improperly selected, thermal failure is caused to cause the pre-charging resistor R ' or the pre-charging relay S3 ' to be burnt, the failure probability of a system is increased, the vehicle cannot be started, and the reliability of the system is reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a charging control system and a charging control method, which do not need a pre-charging relay and a pre-charging resistor, reduce the cost and the complexity of the system, reduce the failure probability of the system, avoid the condition that a vehicle cannot be started and improve the reliability of the system.
The technical scheme of the invention provides a charging control system, which comprises a controller, a low-voltage storage battery, a direct current-direct current converter, a positive relay, a negative relay and a capacitor, wherein the controller is connected with the low-voltage storage battery;
the first end of the positive relay is connected with the first end of the negative relay, and the second end of the positive relay and the first end of the capacitor are connected to the positive high-voltage end of the DC-DC converter; the second end of the negative relay and the second end of the capacitor are connected to the negative high-voltage end of the DC-DC converter in a sharing mode; the positive low-voltage end and the negative low-voltage end of the DC-DC converter are respectively connected with the positive pole end and the negative pole end of the low-voltage storage battery; the output end of the controller is connected with the first controlled end of the positive relay, the second controlled end of the negative relay and the third controlled end of the direct current-direct current converter;
and the controller outputs control signals to the positive relay, the negative relay and the direct current-direct current converter after receiving a vehicle starting signal, so that the low-voltage storage battery is used for pre-charging the capacitor through the direct current-direct current converter.
Further, the controller outputs a control signal to the positive relay, the negative relay and the dc-dc converter after receiving a vehicle start signal, so that the low-voltage battery precharges the capacitor through the dc-dc converter, and the method specifically includes:
the controller receives a vehicle starting signal and then outputs a first control signal to the positive relay and the negative relay to control the positive relay to be switched off and the negative relay to be switched on;
when the controller determines that the negative relay is closed within a first preset time, the controller outputs a second control signal to the direct current-direct current converter to control the direct current-direct current converter to work reversely, so that the low-voltage storage battery is used for pre-charging the capacitor through the direct current-direct current converter.
Furthermore, the charge control system further comprises a high-voltage storage battery and a voltage detection module, wherein the positive end and the negative end of the high-voltage storage battery are respectively connected with the first end of the positive relay and the first end of the negative relay, and the voltage detection module detects the voltage at the two ends of the capacitor and transmits the detected voltage value of the capacitor to the controller;
when the controller determines that the difference value between the capacitor voltage value and the voltage value of the high-voltage storage battery is within a preset range, the controller outputs a stop control signal to the direct current-direct current converter so as to stop the direct current-direct current converter.
Further, after the dc-dc converter stops working, the controller outputs a closing control signal to the positive relay;
when the controller determines that the positive relay is closed within a second preset time, the controller outputs a third control signal to the direct current-direct current converter to control the direct current-direct current converter to work in the forward direction, so that the high-voltage storage battery charges the low-voltage storage battery through the direct current-direct current converter.
Further, after the dc-dc converter stops working, the controller outputs a closing control signal to the positive relay;
when the controller determines that the positive relay is not closed within a second preset time, the controller outputs a fourth control signal to the direct current-direct current converter to control the direct current-direct current converter to work in the forward direction;
the controller judges whether the voltage value of the capacitor reaches a preset voltage threshold value, and when the voltage value of the capacitor reaches the preset voltage threshold value, the controller outputs a stop control signal to the direct current-direct current converter to control the direct current-direct current converter to stop working.
The technical scheme of the invention also provides a charging control method, which is realized based on the charging control system, and the pre-charging control method comprises the following steps:
judging whether a vehicle starting signal is received or not;
and after the vehicle starting signal is received, the positive relay is controlled to be switched off, the negative relay is controlled to be switched on, and the direct current-direct current converter is controlled to work reversely, so that the low-voltage storage battery is used for pre-charging the capacitor through the direct current-direct current converter.
Further, after receiving the vehicle start signal, controlling the positive relay to open, controlling the negative relay to close, and controlling the dc-dc converter to work in reverse, so that the low-voltage battery precharges the capacitor through the dc-dc converter, specifically including:
after the vehicle starting signal is received, the positive relay is controlled to be switched off, and the negative relay is controlled to be switched on;
and when the negative relay is determined to be closed within the first preset time, controlling the direct current-direct current converter to work reversely, so that the low-voltage storage battery is used for pre-charging the capacitor through the direct current-direct current converter.
Further, the charge control method further includes:
acquiring a capacitor voltage value at two ends of the capacitor;
and when the difference value between the voltage value of the capacitor and the voltage value of the high-voltage storage battery is determined to be within a preset range, sending a stop control signal to the direct current-direct current converter so as to control the direct current-direct current converter to stop working.
Further, the charge control method further includes:
when the direct current-direct current converter stops working, controlling the positive relay to be closed;
and after the positive relay is determined to be closed within the second preset time, controlling the direct current-direct current converter to work in the forward direction, so that the high-voltage storage battery charges the low-voltage storage battery through the direct current-direct current converter.
Further, the charge control method further includes:
when the direct current-direct current converter stops working, controlling the positive relay to be closed;
if the positive relay is not closed within the second preset time, controlling the direct current-direct current converter to work in the positive direction, and acquiring the capacitor voltage values at two ends of the capacitor;
and when the voltage value of the capacitor reaches a preset voltage threshold value, controlling the direct current-direct current converter to stop working.
After adopting above-mentioned technical scheme, have following beneficial effect: the low-voltage storage battery, the direct current-direct current converter, the positive relay and the negative relay are sequentially connected in series to form a pre-charging loop, when a vehicle starting signal is received and high-voltage power-on is needed, the controller controls the positive relay to be disconnected and the negative relay to be closed, low voltage of the low-voltage storage battery is converted into high voltage power through the direct current-direct current converter, the capacitor is pre-charged, the pre-charging relay and the pre-charging resistor are not needed, the cost and the system complexity are reduced, the failure probability of the system is reduced, the condition that the vehicle cannot be started is avoided, and the system reliability.
Drawings
The disclosure of the present invention will become more readily understood by reference to the drawings. It should be understood that: these drawings are for illustrative purposes only and are not intended to limit the scope of the present disclosure. In the figure:
FIG. 1 is a schematic diagram of a pre-charging circuit of an electric vehicle;
fig. 2 is a schematic structural diagram of a charging control system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a charging control system according to another embodiment of the present invention;
fig. 4 is a schematic diagram of the dc-dc converter shown in fig. 3 in a reverse operation state;
FIG. 5 is a schematic diagram of the DC-DC converter shown in FIG. 3 in a forward operation state;
fig. 6 is a flowchart illustrating a charging control method of a charging control system according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a charging control method of a charging control system according to a preferred embodiment of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings.
It is easily understood that according to the technical solution of the present invention, those skilled in the art can substitute various structures and implementation manners without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as limiting or restricting the technical aspects of the present invention.
The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms.
As shown in fig. 2, a charging control system according to an embodiment of the present invention includes a controller (not shown), a low-voltage battery BT2, a dc-dc converter DCDC, a positive relay S1, a negative relay S2 and a capacitor C,
a first end of the positive relay S1 is connected with a first end of the negative relay S2, and a second end of the positive relay S1 and a first end of the capacitor C are connected to a positive high-voltage end H + of the DC-DC converter DCDC; the second end of the negative relay S2 and the second end of the capacitor C are connected to the negative high-voltage end H-of the DC-DC converter DCDC; a positive low-voltage end L + and a negative low-voltage end L-of the DC-DC converter DCDC are respectively connected with a positive end and a negative end of a low-voltage storage battery BT 2; the output end of the controller is connected with the first controlled end of the positive relay S1, the second controlled end of the negative relay S2 and the third controlled end of the DC-DC converter DCDC;
the controller receives the vehicle start signal and outputs control signals to the positive relay S1, the negative relay S2 and the dc-dc converter DCDC, so that the low-voltage battery BT2 is precharged as the capacitor C.
Specifically, the dc-dc converter DCDC includes a low voltage terminal electrically connected to the low-voltage battery BT2 and a high voltage terminal connected to the external high-voltage bus. The low-voltage end comprises a positive low-voltage end L + and a negative low-voltage end L-, the positive low-voltage end L + and the negative low-voltage end L-are respectively and electrically connected with the positive end and the negative end of the low-voltage storage battery BT2, and the high-voltage end comprises a positive high-voltage end H + and a negative high-voltage end H-, the positive high-voltage end H + and the negative high-voltage end H-are respectively and electrically connected with the positive end and the negative end of the outer-end high-voltage bus.
The controller is used for controlling the working states of the direct current-direct current converter DCDC, the positive relay S1 and the negative relay S2, and comprises a Vehicle Control Unit (VCU). When the VCU receives the vehicle start signal, the VCU controls the positive relay S1 to be opened and the negative relay S2 to be closed, and the dc-dc converter DCDC converts the low voltage of the low-voltage battery BT2 into a high voltage to precharge the capacitor C.
Preferably, the voltage of the low-voltage battery BT2 is 12V.
According to the charging control system provided by the invention, the high-voltage storage battery, the positive relay, the negative relay and the direct current-direct current converter are sequentially connected in series to form the charging loop, the low-voltage storage battery, the direct current-direct current converter, the positive relay and the negative relay are sequentially connected in series to form the pre-charging loop, when a vehicle starting signal is received and high-voltage power-up is required, the controller controls the positive relay to be switched off and the negative relay to be switched on, the low-voltage power of the low-voltage storage battery is converted into high-voltage power through the direct current-direct current converter, the capacitor is pre-charged, the pre-charging relay and the pre-charging resistor are not required, the cost and the system complexity are reduced, the failure probability of the.
In one embodiment, the controller outputs a control signal to the positive relay S1, the negative relay S2, and the dc-dc converter DCDC after receiving the vehicle start signal, so that the low-voltage battery BT2 precharges the capacitor C through the dc-dc converter DCDC, and the method specifically includes:
the controller receives a vehicle starting signal and then outputs a first control signal to the positive relay S1 and the negative relay S2 to control the positive relay S1 to be opened and control the negative relay S2 to be closed;
when the controller determines that the negative relay S2 is closed within the first preset time, the controller outputs a second control signal to the DC-DC converter DCDC to control the DC-DC converter DCDC to work reversely, so that the low-voltage storage battery BT2 is precharged to the capacitor C through the DC-DC converter DCDC.
Specifically, the working state of the dc-dc converter DCDC includes a forward working state and a reverse working state, and when the dc-dc converter DCDC is in the forward working state, the capacitor C charges the low-voltage battery BT2 through the dc-dc converter DCDC; when the direct current-direct current converter DCDC is in a reverse working state, the low-voltage storage battery BT2 charges the capacitor C through the direct current-direct current converter DCDC.
When the pre-charging is needed, the VCU sends a reverse working instruction to the direct current-direct current converter DCDC, after the direct current-direct current converter DCDC receives the reverse working instruction, the low-voltage end (L + and L-) is set as an input end, the high-voltage end (H + and H-) is set as an output end, the direct current-direct current converter DCDC is in a reverse working state, the low voltage of the low-voltage storage battery BT2 is converted into the high voltage, and the capacitor C is pre-charged.
In one embodiment, as shown in fig. 3, the charge control system further includes a high-voltage battery BT1 and a voltage detection module (not shown), wherein the positive terminal and the negative terminal of the high-voltage battery BT1 are respectively connected to the first terminal of the positive relay S1 and the first terminal of the negative relay S2, and the voltage detection module detects the voltage across the capacitor C and transmits the detected voltage value of the capacitor to the controller;
when the controller determines that the difference value between the capacitor voltage value and the voltage value of the high-voltage storage battery BT1 is within a preset range, the controller outputs a stop control signal to the DC-DC converter DCDC so as to stop the DC-DC converter DCDC from working.
Specifically, the voltage detection module detects the voltage at two ends of the capacitor C in real time, outputs the detected capacitor voltage value to the VCU, and after receiving the capacitor voltage value transmitted by the voltage detection module, the VCU compares the capacitor voltage value with the voltage value of the high-voltage storage battery BT1, and when the difference between the capacitor voltage value and the voltage value of the high-voltage storage battery BT1 is within a preset range, the VCU outputs a stop control signal to the dc-dc converter CDDC, so that the dc-dc converter DCDC stops precharging.
Preferably, the controller further comprises a Battery Management System (BMS), one end of the BMS is communicatively connected to the VCU, the other end of the BMS is electrically connected to the control ends of the positive relay S1 and the negative relay S2, the BMS acquires the voltage value of the high voltage Battery BT1 in real time and outputs the acquired voltage value to the VCU, the VCU sends a control signal to the BMS according to the voltage value of the high voltage Battery BT1, and the BMS controls the positive relay S1 and the negative relay S2 to be turned on or off after receiving the control signal sent by the VCU.
Preferably, in order to improve system stability, the output terminals of the BMS are hard-wired to the positive relay S1 and the negative relay S2, respectively.
Preferably, to improve efficiency, the VCU is connected to the BMS and the dc-dc converter DCDC through Controller Area Network (CAN) lines, respectively.
In one embodiment, after the dc-dc converter DCDC stops working, the controller outputs a closing control signal to the positive relay S1;
when the controller determines that the positive relay S1 is closed within the second preset time, the controller outputs a third control signal to the dc-dc converter DCDC to control the dc-dc converter DCDC to operate in the forward direction, so that the high-voltage battery BT1 charges the low-voltage battery BT2 through the dc-dc converter DCDC.
Specifically, the high-voltage battery BT1, the positive relay S1, the negative relay S2 and the dc-dc converter DCDC are sequentially connected in series to form a main charging loop, the low-voltage battery BT2, the dc-dc converter DCDC, the positive relay S1 and the negative relay S2 form a pre-charging loop, and the VCU controls the working state of the dc-dc converter DCDC to realize the switching between the main charging loop and the pre-charging loop. As shown in fig. 4, when the pre-charging is required, the VCU sends a reverse operation instruction to the dc-dc converter DCDC, and after receiving the reverse operation instruction, the dc-dc converter DCDC sets the low-voltage end (L +, L-) as an input end, and sets the high-voltage end (H +, H-) as an output end, and the dc-dc converter DCDC is in a reverse operation state, converts the low voltage of the low-voltage battery BT2 into a high voltage, and pre-charges the capacitor C; as shown in fig. 5, when the difference between the capacitor voltage value of the capacitor C and the voltage value of the high-voltage battery BT1 is within the preset range, the VCU sends a positive relay S1 closing signal to the BMS, the BMS controls the positive relay S1 to close after receiving the positive relay S1 closing signal, and the dc-dc converter DCDC converts the high voltage of the high-voltage battery BT1 into a low voltage to charge the low-voltage battery, thereby realizing the switching between the main charging loop and the pre-charging loop.
Preferably, when the difference value of the capacitor voltage value and the voltage value of the high-voltage storage battery BT1 is in the range of 0V-5V, the positive relay S1 is controlled to be closed.
In one embodiment, after the dc-dc converter DCDC stops working, the controller outputs a closing control signal to the positive relay S1;
when the controller determines that the positive relay S1 is not closed within the second preset time, the controller outputs a fourth control signal to the DC-DC converter DCDC to control the DC-DC converter DCDC to work in the forward direction;
the controller judges whether the voltage value of the capacitor reaches a preset voltage threshold value, and when the voltage value of the capacitor reaches the preset voltage threshold value, the controller outputs a stop control signal to the DC-DC converter DCDC to control the DC-DC converter DCDC to stop working.
Specifically, after the dc-dc converter DCDC stops working, the VCU sends a positive relay S1 closing signal to the BMS, and starts timing, when the positive relay S1 closing signal fed back by the BMS is not received within a second preset time, the VCU sends a fourth control signal to the BMS, the BMS controls the dc-dc converter DCDC to work in the forward direction, the voltage detection module collects the capacitor voltage value of the capacitor C to the VCU in real time, the VCU judges whether the capacitor voltage value reaches a preset voltage threshold, and when the capacitor voltage value reaches the preset voltage threshold (indicating that the high-voltage bus residual energy has stored the energy in the low-voltage battery BT2 and the discharge is completed), the VCU outputs a stop control signal to the dc-dc converter DCDC to control the dc-dc converter DCDC to stop working.
Preferably, the preset voltage threshold is 12V.
In this embodiment, the first preset time and the second preset time may be set according to a requirement of a user, and the first preset time and the second preset time may be set to be the same time, or may be set to be different times, for example, the first preset time is 3s, the second preset time is 4s, or both the first preset time and the second preset time are 5s, and are not limited to specific time values.
As shown in fig. 6, a control method of a charging control system according to an embodiment of the present invention includes:
step S101: judging whether a vehicle starting signal is received or not;
step S102: and after receiving a vehicle starting signal, controlling the positive relay to be disconnected, controlling the negative relay to be closed and the direct current-direct current converter to work reversely so as to enable the low-voltage storage battery to be precharged for the capacitor through the direct current-direct current converter.
Specifically, after the driver presses the vehicle start button, the VCU executes step S101 to receive a vehicle start signal, and then executes step S102 to send a command to the BMS that the positive relay S1 is turned off and the negative relay S2 is turned on through the CAN line, and after receiving the command sent by the VCU, the BMS controls the positive relay S1 to turn off through the control terminal of the positive relay S1 and the negative relay S2 to turn on through the control terminal of the negative relay S2, so that the low-voltage battery BT2, the dc-dc converter DCDC, the negative relay S2 and the outer-end high-voltage bus are connected, a pre-charging circuit is activated, the dc-dc converter DCDC is controlled to convert the low voltage of the low-voltage battery BT2 into a high voltage, and the capacitor C is pre-charged.
According to the control method of the charging control system, when a vehicle starting signal is received, the controller controls the positive relay to be disconnected and the negative relay to be closed, low voltage electricity of the low-voltage storage battery is converted into high voltage electricity through the direct current-direct current converter, the capacitor is precharged, the precharge relay and the precharge resistor are not needed, the cost and the system complexity are reduced, the failure probability of the system is reduced, the vehicle cannot be started is avoided, and the system reliability is improved.
As shown in fig. 7, a control method of a charging control system according to a preferred embodiment of the present invention includes:
step S201: judging whether a vehicle starting signal is received or not;
specifically, after receiving the vehicle start signal, step S202 is executed, otherwise, step S201 is continuously executed.
Step S202: judging whether the vehicle condition meets a high-voltage power-on condition or not;
specifically, the VCU determines whether the vehicle state satisfies the high-voltage power-on condition, which is not limited to the communication check of each controller, the fault check of the actuator (such as a relay), and the like, and if the vehicle state satisfies the high-voltage power-on condition, the step S203 is executed, otherwise, the step S201 is executed, and the driver waits for pressing the start button again.
Step S203: controlling the positive relay to be opened and the negative relay to be closed;
specifically, the VCU sends out the opening of positive relay S1, negative relay S2 closure instruction to BMS through the CAN line, and BMS controls positive relay S1 to open, negative relay S2 to close through the hardwire after receiving the instruction that VCU sent, and BMS feeds back the state of negative relay S2 to the VCU through the CAN line.
Step S204: judging whether the negative relay is closed within a first preset time;
specifically, the VCU determines whether the negative relay S2 receiving the BMS feedback is in a closed state within a first preset time, and if so, performs step S205, otherwise, performs step S201 to wait for the driver to press the start button again.
Step S205: controlling the DC-DC converter to work reversely;
specifically, the VCU sends a reverse working instruction to the dc-dc converter DCDC through the CAN line, and after receiving the reverse working instruction, the dc-dc converter DCDC sets the low-voltage end (L +, L-) as an input end and the high-voltage end (H +, H-) as an output end, so that the dc-dc converter DCDC is in a reverse working state, converts the low voltage of the low-voltage storage battery BT2 into a high voltage, pre-charges the capacitor C, and feeds back that the dc-dc converter DCDC is already in the reverse working state to the VCU through the CAN line.
Step S206: acquiring a capacitor voltage value at two ends of a capacitor;
specifically, after receiving that the feedback of the dc-dc converter DCDC is in the reverse working state, the VCU obtains the capacitance voltage value of the capacitor C in real time through the voltage detection module and obtains the voltage value of the high-voltage battery BT1 in real time through the BMS.
Step S207: judging whether the difference value between the voltage value of the capacitor and the voltage value of the high-voltage storage battery is within a preset range or not;
specifically, when the difference between the capacitor voltage value and the voltage value of the high-voltage battery is within the preset range, step S208 is executed, otherwise, step S205-step S207 are continuously executed.
Step S208: sending a stop control signal to the DC-DC converter to control the DC-DC converter to stop working;
specifically, when the difference between the voltage value of the capacitor and the voltage value of the high-voltage battery BT1 is within the preset range, the VCU outputs a stop control signal to the dc-dc converter CDDC to stop the pre-charging of the dc-dc converter DCDC, thereby completing the pre-charging of the capacitor C.
Step S209: when the DC-DC converter stops working, the positive relay is controlled to be closed;
specifically, after receiving the work stop state fed back by the dc-dc converter DCDC, the VCU sends a positive relay S1 closing command to the BMS, and the BMS controls the positive relay S1 to close through a hard wire after receiving the command of the VCU and feeds back the work state of the positive relay S1 to the VCU.
Step S210: judging whether the positive relay is closed within a second preset time;
specifically, the VCU determines whether a positive relay S1 closing signal is received within a second preset time, if so, step S211 is executed, otherwise, step S212 is executed.
Step S211: controlling the direct current-direct current converter to work in the forward direction so that the high-voltage storage battery charges the low-voltage storage battery through the direct current-direct current converter;
specifically, after the VCU sends a forward working instruction and a preset voltage threshold to the dc-dc converter DCDC, the dc-dc converter DCDC receives the forward working instruction and the preset voltage threshold sent by the VCU, sets the high-voltage end (H +, H-) as an input end, and sets the low-voltage end (L +, L-) as an output end, so that the dc-dc converter DCDC is in a forward working state, converts the high-voltage power of the high-voltage storage battery BT1 into low-voltage power, charges the low-voltage storage battery BT2, completes the whole high-voltage power-up, and starts the vehicle.
Step S212: controlling the direct current-direct current converter to work in the forward direction, and controlling the direct current-direct current converter to convert the high voltage of the high-voltage bus at the outer end into low voltage and store the low voltage in the low-voltage storage battery;
specifically, the VCU sends a forward working command to the dc-dc converter DCDC, and sends a target voltage of 12V. After receiving a positive working request of the VCU, the direct current-direct current converter DCDC takes a high-voltage end (H & H-) as an input end and a low-voltage end (L & L-) as an output end, converts residual high-voltage electricity of a high-voltage bus at the outer end into low-voltage electricity, and stores the energy in a low-voltage storage battery BT 1.
Step S213: judging whether the voltage value of the capacitor reaches a preset voltage threshold value or not;
specifically, the VCU determines whether the capacitor voltage value reaches a preset voltage threshold, if so, step S214 is executed, otherwise, step S212 is continuously executed.
Step S214, outputting a stop control signal to the DC-DC converter to control the DC-DC converter to stop working.
Specifically, when the voltage value of the capacitor reaches the preset voltage threshold value, it indicates that the residual energy of the high-voltage bus has stored the energy in the low-voltage battery BT2, and the discharge is completed, the VCU outputs a stop control signal to the dc-dc converter DCDC to control the dc-dc converter DCDC to stop working, and after the dc-dc converter DCDC stops working, the step S201 is returned to, and the driver waits for pressing again to start pressing.
In this embodiment, the first preset time and the second preset time may be set according to a requirement of a user, and the first preset time and the second preset time may be set to be the same time, or may be set to be different times, for example, the first preset time is 3s, the second preset time is 4s, or both the first preset time and the second preset time are 5s, and are not limited to specific time values.
According to the control method of the charging control system, when a vehicle starting signal is received, the controller controls the positive relay to be disconnected and the negative relay to be closed, and low voltage electricity of the low-voltage storage battery is converted into high voltage electricity through the direct current-direct current converter, so that the capacitor is precharged; when the pre-charging is finished, the positive relay of the controller is closed, the high voltage of the high-voltage storage battery is converted into low voltage electricity through the direct current-direct current converter, the high-voltage storage battery charges the low-voltage storage battery, the pre-charging relay and the pre-charging resistor are not needed, the cost and the system complexity are reduced, the failure probability of the system is reduced, the vehicle cannot be started, and the system reliability is improved.
Claims (10)
1. A charging control system is characterized by comprising a controller, a low-voltage storage battery, a direct current-direct current converter, a positive relay, a negative relay and a capacitor;
the first end of the positive relay is connected with the first end of the negative relay, and the second end of the positive relay and the first end of the capacitor are connected to the positive high-voltage end of the DC-DC converter; the second end of the negative relay and the second end of the capacitor are connected to the negative high-voltage end of the DC-DC converter in a sharing mode; the positive low-voltage end and the negative low-voltage end of the DC-DC converter are respectively connected with the positive pole end and the negative pole end of the low-voltage storage battery; the output end of the controller is connected with the first controlled end of the positive relay, the second controlled end of the negative relay and the third controlled end of the direct current-direct current converter;
and the controller outputs control signals to the positive relay, the negative relay and the direct current-direct current converter after receiving a vehicle starting signal, so that the low-voltage storage battery is used for pre-charging the capacitor through the direct current-direct current converter.
2. The charging control system of claim 1, wherein the controller outputs control signals to the positive relay, the negative relay, and the dc-dc converter after receiving a vehicle start signal, so that the low-voltage battery precharges the capacitor through the dc-dc converter, specifically comprising:
the controller receives a vehicle starting signal and then outputs a first control signal to the positive relay and the negative relay to control the positive relay to be switched off and the negative relay to be switched on;
when the controller determines that the negative relay is closed within a first preset time, the controller outputs a second control signal to the direct current-direct current converter to control the direct current-direct current converter to work reversely, so that the low-voltage storage battery is used for pre-charging the capacitor through the direct current-direct current converter.
3. The charge control system according to claim 1, further comprising a high-voltage battery and a voltage detection module, wherein a positive terminal and a negative terminal of the high-voltage battery are respectively connected to the first terminal of the positive relay and the first terminal of the negative relay, and the voltage detection module detects a voltage across the capacitor and transmits a detected voltage value of the capacitor to the controller;
when the controller determines that the difference value between the capacitor voltage value and the voltage value of the high-voltage storage battery is within a preset range, the controller outputs a stop control signal to the direct current-direct current converter so as to stop the direct current-direct current converter.
4. The charge control system according to claim 3,
after the direct current-direct current converter stops working, the controller outputs a closing control signal to the positive relay;
when the controller determines that the positive relay is closed within a second preset time, the controller outputs a third control signal to the direct current-direct current converter to control the direct current-direct current converter to work in the forward direction, so that the high-voltage storage battery charges the low-voltage storage battery through the direct current-direct current converter.
5. The charge control system according to claim 3,
after the direct current-direct current converter stops working, the controller outputs a closing control signal to the positive relay;
when the controller determines that the positive relay is not closed within a second preset time, the controller outputs a fourth control signal to the direct current-direct current converter to control the direct current-direct current converter to work in the forward direction;
the controller judges whether the voltage value of the capacitor reaches a preset voltage threshold value, and when the voltage value of the capacitor reaches the preset voltage threshold value, the controller outputs a stop control signal to the direct current-direct current converter to control the direct current-direct current converter to stop working.
6. A charging control method implemented based on the charging control system according to any one of claims 1 to 5, the charging control method comprising:
judging whether a vehicle starting signal is received or not;
and after the vehicle starting signal is received, the positive relay is controlled to be switched off, the negative relay is controlled to be switched on, and the direct current-direct current converter is controlled to work reversely, so that the low-voltage storage battery is used for pre-charging the capacitor through the direct current-direct current converter.
7. The charge control method according to claim 6, wherein after receiving the vehicle start signal, controlling the positive relay to open, controlling the negative relay to close, and controlling the dc-dc converter to work in reverse, so that the low-voltage battery precharges the capacitor through the dc-dc converter, specifically comprising:
after the vehicle starting signal is received, the positive relay is controlled to be switched off, and the negative relay is controlled to be switched on;
and when the negative relay is determined to be closed within the first preset time, controlling the direct current-direct current converter to work reversely, so that the low-voltage storage battery is used for pre-charging the capacitor through the direct current-direct current converter.
8. The charge control method according to claim 7, characterized by further comprising:
acquiring a capacitor voltage value at two ends of the capacitor;
and when the difference value between the voltage value of the capacitor and the voltage value of the high-voltage storage battery is determined to be within a preset range, sending a stop control signal to the direct current-direct current converter so as to control the direct current-direct current converter to stop working.
9. The charge control method according to claim 8, characterized by further comprising:
when the direct current-direct current converter stops working, controlling the positive relay to be closed;
and after the positive relay is determined to be closed within the second preset time, controlling the direct current-direct current converter to work in the forward direction, so that the high-voltage storage battery charges the low-voltage storage battery through the direct current-direct current converter.
10. The charge control method according to claim 8, characterized by further comprising:
when the direct current-direct current converter stops working, controlling the positive relay to be closed;
if the positive relay is not closed within the second preset time, controlling the direct current-direct current converter to work in the positive direction, and acquiring the capacitor voltage values at two ends of the capacitor;
and when the voltage value of the capacitor reaches a preset voltage threshold value, controlling the direct current-direct current converter to stop working.
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| CN202011058047.5A CN112087037A (en) | 2020-09-29 | 2020-09-29 | Charging control system and control method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112531865A (en) * | 2020-12-22 | 2021-03-19 | 恒大新能源汽车投资控股集团有限公司 | Power battery system, charging method thereof, storage medium and vehicle control unit |
| CN112848932A (en) * | 2021-01-15 | 2021-05-28 | 重庆长安新能源汽车科技有限公司 | Control method and control system for direct current charging of electric automobile |
| CN113183761A (en) * | 2021-05-21 | 2021-07-30 | 东风汽车集团股份有限公司 | High-voltage pre-charging loop, high-voltage pre-charging method and high-voltage pre-charging system of electric automobile |
| CN114801876A (en) * | 2022-05-23 | 2022-07-29 | 中国第一汽车股份有限公司 | Precharge control method, precharge control device, storage medium, processor and electronic device |
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2020
- 2020-09-29 CN CN202011058047.5A patent/CN112087037A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112531865A (en) * | 2020-12-22 | 2021-03-19 | 恒大新能源汽车投资控股集团有限公司 | Power battery system, charging method thereof, storage medium and vehicle control unit |
| CN112848932A (en) * | 2021-01-15 | 2021-05-28 | 重庆长安新能源汽车科技有限公司 | Control method and control system for direct current charging of electric automobile |
| CN112848932B (en) * | 2021-01-15 | 2022-05-31 | 重庆长安新能源汽车科技有限公司 | Control method and control system for direct current charging of electric automobile |
| CN113183761A (en) * | 2021-05-21 | 2021-07-30 | 东风汽车集团股份有限公司 | High-voltage pre-charging loop, high-voltage pre-charging method and high-voltage pre-charging system of electric automobile |
| CN114801876A (en) * | 2022-05-23 | 2022-07-29 | 中国第一汽车股份有限公司 | Precharge control method, precharge control device, storage medium, processor and electronic device |
| WO2023226980A1 (en) * | 2022-05-23 | 2023-11-30 | 中国第一汽车股份有限公司 | Pre-charge control method and apparatus, and storage medium, processor and electronic apparatus |
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