CN113733964A - Control method of vehicle-mounted charger of pure electric vehicle - Google Patents
Control method of vehicle-mounted charger of pure electric vehicle Download PDFInfo
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- CN113733964A CN113733964A CN202111067070.5A CN202111067070A CN113733964A CN 113733964 A CN113733964 A CN 113733964A CN 202111067070 A CN202111067070 A CN 202111067070A CN 113733964 A CN113733964 A CN 113733964A
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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
- B60L53/60—Monitoring or controlling charging stations
- B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
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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
- B60L53/60—Monitoring or controlling charging stations
- B60L53/66—Data transfer between charging stations and vehicles
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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
- B60L2260/00—Operating Modes
- B60L2260/40—Control modes
- B60L2260/44—Control modes by parameter estimation
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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
- 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
- Y02T90/12—Electric charging stations
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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
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
According to the control method of the vehicle-mounted charger of the pure electric vehicle, a slow charging socket is arranged on an OBC (on-board battery) of the vehicle-mounted charger, the slow charging socket is electrically communicated with the OBC of the vehicle-mounted charger through an alternating current wiring harness, and a direct current output end of the OBC of the vehicle-mounted charger is electrically connected with a power battery pack; the CC signal end of the slow charging socket is connected with the CC signal end of the VCU of the vehicle controller, the CP signal end of the slow charging socket is connected with the CP signal end of the BMS, and CAN signal interfaces of the OBC, the VCU of the vehicle controller and the BMS are in signal connection with a CAN bus; the wake-up signal end of the VCU of the vehicle control unit is connected with a battery management system BMS; the alternating current charging pile is electrically connected with the slow charging socket through the alternating current charging gun; the method comprises the processes of power-on, work and power-off. The design not only enhances the collaboration among the vehicle-mounted charging systems, but also effectively reduces the occurrence probability of the phenomenon of slow charging and gun jumping caused by overvoltage.
Description
Technical Field
The invention relates to a control method of a vehicle-mounted charger of a pure electric vehicle, which is particularly suitable for improving the charging safety and reliability of the vehicle.
Background
The pure electric vehicle is an important type of new energy vehicles in future development and basically has no pollution to the environment. With the strong support of the country, various types of pure electric vehicles have rapidly developed from 12 years. With the increase of the capacity of the new energy automobile, the charging safety is also important. The design requirement of the whole vehicle on a vehicle-mounted charger is higher and higher, and the requirement on safety performance is higher and higher.
The power supply is carried out when the peak power utilization time of some regions is lower than 200V, when the current state is in slow charging operation, the OBC carries out voltage and current distribution through the power required by a power battery pack BMS, in short, the OBC is charged with constant power, when the voltage provided by the power grid is lower than 200V, the BMS required power is unchanged, the current input into the OBC possibly exceeds the set value of the primary protection current of the alternating current charging gun, even more, the current input into the OBC exceeds the set value of the secondary protection current, and when the current input into the OBC exceeds the maximum current allowed by the charging gun, the control box of the alternating current gun cuts off the alternating current charging for protecting the alternating current gun. Thereby affecting the customer experience and product satisfaction.
Disclosure of Invention
The invention aims to solve the problem of gun skip due to overcurrent in the prior art, and provides a control method of a vehicle-mounted charger of a pure electric vehicle, which can avoid gun skip due to overcurrent.
In order to achieve the above purpose, the technical solution of the invention is as follows:
a control method of a vehicle-mounted charger of a pure electric vehicle is based on a whole vehicle charging system: whole car charging system includes: the system comprises a vehicle-mounted charger OBC, a vehicle control unit VCU, a battery management system BMS and a power battery pack, wherein a slow charging socket is arranged on the vehicle-mounted charger OBC, the slow charging socket is electrically communicated with an alternating current input interface of the vehicle-mounted charger OBC through an alternating current wiring harness, and a direct current output end of the vehicle-mounted charger OBC is electrically connected with the power battery pack; the connection detection CC signal output end of the slow charging socket is in signal connection with the connection detection CC signal input end of the vehicle control unit VCU, the charging control CP signal output end of the slow charging socket is in signal connection with the charging control CP signal input end of the battery management system BMS, and CAN signal interfaces of the vehicle-mounted charger OBC, the vehicle control unit VCU and the battery management system BMS are in signal connection with a CAN bus; the wake-up signal output end of the VCU of the vehicle controller is in signal connection with the wake-up signal input end of the BMS; the slow charging socket is in insertion fit with an alternating current charging gun of the alternating current charging pile, and the alternating current charging pile is electrically connected with the slow charging socket through the alternating current charging gun;
the control method comprises the following steps:
step 1: go up the electric flow, exchange and charge behind the rifle inserted the rifle with the electric socket electricity of slowly charging, the alternating current signal awakens up whole car charging system: the method comprises the following steps that a slow charging socket sends a connection detection CC signal to a vehicle control unit VCU through a CC signal hard wire, the vehicle control unit VCU receives the connection detection CC signal and then wakes up for self-detection, the vehicle control unit VCU sends a wake-up signal to a battery management system BMS after self-detection is free of problems, the battery management system BMS performs self-detection after being woken up, the battery management system BMS receives a charging control CP signal sent by the slow charging socket after self-detection is free of problems, the battery management system BMS closes an internal switch after detecting that the duty ratio of the charging control CP signal is normal, an alternating current charging pile detects that the internal switch of the battery management system BMS is closed, alternating current 220V voltage is controlled to be output to a vehicle-mounted charger OBC, the vehicle-mounted charger OBC automatically wakes up and is in a standby state after detecting the alternating current 220V voltage, and the power-on process enters the next step at the moment;
step 2: the method comprises the following steps that in the working process, when the vehicle control unit VCU and the battery management system BMS are self-checked and have no problem, the vehicle control unit VCU sends a connection detection CC signal to the vehicle-mounted charger OBC through a CAN bus, and the battery management system BMS sends a charging current demand signal, a charging voltage demand signal and a charging control CP signal to the vehicle-mounted charger OBC through the CAN bus; the OBC judges the maximum current which can be borne by a charging gun and a charging cable according to the received charging current demand signal, charging voltage demand signal, connection detection CC signal and charging control CP signal, and dynamically adjusts the output power by detecting the AC voltage value at the input side in real time so as to ensure that the current at the input AC side does not exceed the limit value of the system;
and step 3: the power-off process comprises a normal power-off process and an abnormal power-off process;
the abnormal lower current path is as follows: the power-on process is normal, when the OBC finds that the received signal is abnormal or the OBC has a fault in the charging process, the OBC reports the fault and stops charging;
the normal power-off process comprises the following steps: when the power battery pack is full of electricity, or the alternating current charging pile is manually pressed to stop the charging button or the alternating current charging gun is manually pulled out, and the vehicle-mounted charger OBC stops charging.
The step 2: in the work flow, the method comprises the following steps of,
when the OBC is connected with the 10A alternating-current charging pile, the OBC adjusts the output power in real time and collects the input voltage in real time to control the input current not to exceed 8A;
when the OBC is connected with the 16A alternating-current charging pile, the OBC adjusts the output power in real time and collects the input voltage in real time to control the input current not to exceed 13A;
when the OBC is connected with the AC charging pile of 32A, the OBC adjusts the output power in real time and collects the input voltage in real time to control the input current not to exceed 32A.
The step 3: in the power-off process, the abnormal power-off process refers to: the electrifying process is normal, and one of the following abnormal conditions is generated to judge a fault and stop charging:
a. when the connection detection CC signal loss and the charging control CP signal are normal, which are sent by the VCU and the BMS through the CAN line, which are received by the OBC;
b. when a connection detection CC signal sent by a VCU (vehicle control unit) and a BMS (battery management system) through a CAN (controller area network) line is normal and a charging control CP signal is lost, which are received by an OBC (on-board battery charger);
c. when the connection detection CC signal and the charging control CP signal which are sent by the VCU and the BMS of the vehicle controller and are received by the OBC of the vehicle-mounted charger through the CAN line are lost;
d. when a connection detection CC signal sent by a VCU (vehicle control unit) and a BMS (battery management system) through a CAN (controller area network) line and received by an OBC (on-board battery charger) are normal and the duty ratio of a CP (charge control) signal value is lower than 8% or higher than 90%;
e. the connection detection CC signal and the charging control CP signal sent by the VCU and the BMS through the CAN line received by the OBC are normal, the charging current demand signal and the charging voltage demand signal sent by the BMS are normal when the OBC receives the fault, and the fault is reported and the charging is stopped when the inside of the OBC fails.
The OBC direct current output end of the vehicle-mounted charger is electrically connected with the power battery pack through the high-voltage distribution box PDU, and a CAN signal interface of the high-voltage distribution box PDU is connected with a CAN bus signal.
The step 2: in the working process, when the vehicle control unit VCU and the battery management system BMS are self-checked without problems, the vehicle control unit VCU sends a connection detection CC signal to the vehicle-mounted charger OBC through the CAN bus, and the battery management system BMS sends a charging current demand signal, a charging voltage demand signal and a charging control CP signal to the vehicle-mounted charger OBC through the CAN bus; the VCU sends a closing slow charging relay instruction to the high-voltage distribution box PDU, and the high-voltage distribution box PDU feeds back a closing signal of the slow charging relay to the VCU after receiving the instruction; the OBC judges the maximum current which can be borne by the charging gun and the charging cable according to the received charging current demand signal, the charging voltage demand signal, the values of the connection detection CC signal and the charging control CP signal, and dynamically adjusts the output power according to the alternating current voltage value of the input side so as to ensure that the current input to the alternating current side does not exceed the limit value of the system.
The step 3: in the power-off process, in the normal power-off process, the power-off process is as follows when the power battery pack is fully charged:
when the charging system normally charges, the battery management system BMS monitors the monomer voltage of the power battery in real time, when the monomer voltage reaches a preset maximum value, the battery management system BMS firstly reduces a charging current demand signal and a charging voltage demand signal to 0, when the vehicle-mounted charger OBC receives the charging current demand signal and the charging voltage demand signal, the output current output voltage is reduced to 0, data are sent through the CAN bus, the battery management system BMS sends a shutdown instruction to the vehicle-mounted charger OBC after receiving the data, and the vehicle-mounted charger OBC stands by after receiving the shutdown instruction; at the moment, the 220V alternating current of the alternating current charging gun is controlled to be disconnected, the OBC is completely in a shutdown state after the 220V alternating current is disconnected, the BMS requests the VCU of the vehicle control unit to disconnect the slow charging relay at the moment, the VCU of the vehicle control unit sends a command of disconnecting the slow charging relay to the high-voltage distribution box PDU after receiving the command, the high-voltage distribution box PDU receives the command of disconnecting the slow charging relay and feeds the state of the relay back to the CAN bus, and power-off is completed at the moment.
The step 3: in the power-off process, in the normal power-off process, when the alternating current charging pile is manually pressed to stop the charging button or the alternating current charging gun is manually pulled out, the power-off process is as follows:
when the charging system normally charges, when an alternating current charging pile stop charging button is manually pressed or the alternating current charging gun is manually pulled out, the duty ratio of a charging control CP signal of the alternating current charging gun or the alternating current charging pile at the moment is 0% or 100%, when a battery management system BMS receives the charging control CP signal, the charging is immediately stopped, the battery management system BMS firstly reduces a charging current demand signal and a charging voltage demand signal to 0, when an on-board charger OBC receives the charging current demand signal and the charging voltage demand signal, the output current output voltage is reduced to 0, and data is sent through a CAN bus, the battery management system BMS sends a stop instruction to the on-board charger OBC after receiving the data, and the on-board charger OBC waits after receiving the stop instruction; the battery management system BMS requests the VCU of the vehicle control unit to disconnect the slow charging relay at the moment, the VCU of the vehicle control unit sends an instruction for disconnecting the slow charging relay to the high-voltage distribution box PDU after receiving the instruction, the high-voltage distribution box PDU receives the instruction for disconnecting the slow charging relay and feeds the state of the relay back to the CAN bus, and power-off is completed at the moment.
The step 3: in the power-off process, the abnormal power-off process further comprises:
f. the method comprises the following steps that connection detection CC signals and charging control CP signals, which are sent by a vehicle control unit VCU and a battery management system BMS through CAN lines, received by an OBC (on-board battery charger), are normal, a high-voltage distribution box PDU receives a command of closing a slow charging relay of the vehicle control unit VCU, the high-voltage distribution box PDU does not feed back the closing signal of the slow charging relay to the vehicle control unit VCU, the time delay is 5S, and the OBC reports a fault to the vehicle control unit VCU and stops charging;
g. the method comprises the following steps that connection detection CC signals and charging control CP signals, which are sent by a vehicle control unit VCU and a battery management system BMS through CAN lines, received by an on-board charger OBC are normal, a high-voltage distribution box PDU does not receive a closed slow charging relay instruction of the vehicle control unit VCU, the time is delayed by 5S, and the on-board charger OBC reports a fault to the vehicle control unit VCU and stops charging;
h. the connection detection CC signal and the charging control CP signal which are sent by the VCU and the BMS through the CAN line and received by the OBC are normal, the high-voltage distribution box PDU receives a command of closing the slow charging relay of the VCU, the high-voltage distribution box PDU feeds back a fault signal of the slow charging relay to the VCU, the time delay is 5S, and the OBC reports the fault to the VCU and stops charging.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the control method of the vehicle-mounted charger of the pure electric vehicle, the vehicle-mounted charger OBC, the vehicle control unit VCU, the battery management system BMS and the power battery pack cooperate with one another, the problem of abnormal gun jump caused by overcurrent during charging can be found in time, the vehicle-mounted charger OBC judges the maximum current which can be borne by a charging gun and a charging cable according to the received charging current demand signal, the charging voltage demand signal, the values of the connection detection CC signal and the charging control CP signal, and dynamically adjusts the output power according to the alternating voltage value of the input side, so that the current input to the alternating current side cannot exceed the limit value of the system, and the problem of abnormal gun jump caused by overcurrent is fundamentally avoided. Therefore, the design has high cooperativity, and can ensure the safe and reliable operation of the system.
2. According to the control method of the vehicle-mounted charger of the pure electric vehicle, the CAN network is used for being communicated among the vehicle-mounted charger OBC, the vehicle control unit VCU, the battery management system BMS and the high-voltage distribution box PDU, so that the wiring among controllers is simplified, and meanwhile, the signal flow among the controllers is optimized. Therefore, the design has simple wiring and high signal transmission efficiency between the controllers.
3. According to the control method of the vehicle-mounted charger of the pure electric vehicle, the OBC judges the maximum current which can be borne by the charging gun and the charging cable according to the values of the received charging current demand signal, the charging voltage demand signal, the connection detection CC signal and the charging control CP signal, and dynamically adjusts the output power according to the alternating current voltage value at the input side so as to ensure that the current at the input alternating current side does not exceed the limit value of the system. Therefore, the design can avoid the condition of gun jump during charging due to unstable external voltage.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a logic flow diagram of the present invention.
In the figure: the vehicle-mounted charging device comprises a vehicle-mounted charger OBC1, a slow charging socket 11, a vehicle control unit VCU2, a battery management system BMS3, a power battery pack 4, an alternating current charging pile 5, an alternating current charging gun 51 and a high-voltage distribution box PDU 6.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 and 2, a control method of a vehicle-mounted charger of a pure electric vehicle is based on a vehicle charging system: whole car charging system includes: the vehicle-mounted charger OBC1, the vehicle control unit VCU2, the battery management system BMS3 and the power battery pack 4, wherein a slow charging socket 11 is arranged on the vehicle-mounted charger OBC1, the slow charging socket 11 is electrically communicated with an alternating current input interface of the vehicle-mounted charger OBC1 through an alternating current wiring harness, and a direct current output end of the vehicle-mounted charger OBC1 is electrically connected with the power battery pack 4; the connection detection CC signal output end of the slow charging socket 11 is in signal connection with the connection detection CC signal input end of the vehicle control unit VCU2, the charge control CP signal output end of the slow charging socket 11 is in signal connection with the charge control CP signal input end of the battery management system BMS3, and CAN signal interfaces of the vehicle-mounted charger OBC1, the vehicle control unit VCU2 and the battery management system BMS3 are in signal connection with a CAN bus; the awakening signal output end of the VCU2 of the vehicle controller is in signal connection with the awakening signal input end of the BMS 3; the slow charging socket 11 is matched with an alternating current charging gun 51 of the alternating current charging pile 5 in an inserting manner, and the alternating current charging pile 5 is electrically connected with the slow charging socket 11 through the alternating current charging gun 51;
the control method comprises the following steps:
step 1: go up the electric flow, exchange and charge 51 behind the rifle and be connected with slow charging socket 11 electricity, alternating current signal awakens up whole car charging system: the slow charging socket 11 sends a connection detection CC signal to a vehicle control unit VCU2 through a CC signal hard wire, the vehicle control unit VCU2 receives the connection detection CC signal and then wakes up for self-detection, the vehicle control unit VCU2 sends a wake-up signal to a battery management system BMS3 after self-detection is no problem, the battery management system BMS3 wakes up and then carries out self-detection, the battery management system BMS3 receives a charging control CP signal sent by the slow charging socket 11 after self-detection is no problem, the battery management system BMS3 closes an internal switch after detecting that the duty ratio of the charging control CP signal is normal, the alternating current charging pile 5 detects that the internal switch of the battery management system BMS3 is closed, controls alternating current 220V voltage to be output to a vehicle-mounted charger OBC1, the vehicle-mounted charger OBC1 automatically wakes up and is in a standby state after detecting the alternating current 220V voltage, and the power-on process is finished and then enters the next step;
step 2: the working process comprises the steps that after the vehicle control unit VCU2 and the battery management system BMS3 are self-checked and have no problem, the vehicle control unit VCU2 sends a connection detection CC signal to the vehicle-mounted charger OBC1 through a CAN bus, and the battery management system BMS3 sends a charging current demand signal, a charging voltage demand signal and a charging control CP signal to the vehicle-mounted charger OBC1 through the CAN bus; the OBC1 judges the maximum current that the charging gun and the charging cable can bear according to the values of the received charging current demand signal, charging voltage demand signal, connection detection CC signal and charging control CP signal, detects the AC voltage value at the input side in real time to dynamically adjust the output power, so as to ensure that the current at the input AC side does not exceed the limit value of the system;
and step 3: the power-off process comprises a normal power-off process and an abnormal power-off process;
the abnormal lower current path is as follows: the electrifying process is normal, when the OBC1 finds that the received signal is abnormal or the OBC is in fault in the charging process, the OBC1 reports the fault and stops charging;
the normal power-off process comprises the following steps: when the power battery pack 4 is fully charged, or the alternating current charging pile 5 is manually pressed to stop the charging button or the alternating current charging gun 51 is manually pulled out, the vehicle-mounted charger OBC1 stops charging.
The step 2: in the work flow, the method comprises the following steps of,
when the vehicle-mounted charger OBC1 is connected with the 10A alternating-current charging pile 5, the vehicle-mounted charger OBC1 adjusts output power in real time and collects input voltage in real time to control input current not to exceed 8A;
when the on-board charger OBC1 is connected with the 16A alternating-current charging pile 5, the on-board charger OBC1 adjusts output power in real time and collects input voltage in real time to control input current not to exceed 13A;
when the on-board charger OBC1 is connected with the AC charging pile 5 of 32A, the on-board charger OBC1 adjusts output power in real time and collects input voltage in real time to control input current not to exceed 32A.
The step 3: in the power-off process, the abnormal power-off process refers to: the electrifying process is normal, and one of the following abnormal conditions is generated to judge a fault and stop charging:
a. when the connection detection CC signal loss and the charging control CP signal are normal, which are sent by the vehicle controller VCU2 and the battery management system BMS3 through a CAN line and received by the vehicle-mounted charger OBC 1;
b. when the connection detection CC signals sent by the VCU2 of the vehicle control unit and the BMS3 of the battery management system through the CAN line are normal and the charging control CP signals are lost, which are received by the OBC1 of the vehicle-mounted charger;
c. when the connection detection CC signal and the charging control CP signal which are sent by the vehicle controller VCU2 and the battery management system BMS3 through the CAN line and received by the vehicle-mounted charger OBC1 are lost;
d. when the connection detection CC signals sent by the vehicle control unit VCU2 and the battery management system BMS3 through the CAN line and received by the vehicle-mounted charger OBC1 are normal, and the duty ratio of the charging control CP signal value is lower than 8% or higher than 90%;
e. the connection detection CC signal and the charging control CP signal sent by the vehicle control unit VCU2 and the battery management system BMS3 through the CAN line received by the vehicle-mounted charger OBC1 are normal, the charging current demand signal and the charging voltage demand signal sent by the battery management system BMS3 received by the vehicle-mounted charger OBC1 are normal, and when a fault occurs in the vehicle-mounted charger, the fault is reported and the charging is stopped.
The direct current output end of the vehicle-mounted charger OBC1 is electrically connected with the power battery pack 4 through a high-voltage distribution box PDU6, and a CAN signal interface of the high-voltage distribution box PDU6 is connected with a CAN bus signal.
The step 2: in the working process, when the vehicle control unit VCU2 and the battery management system BMS3 are self-checked and have no problem, the vehicle control unit VCU2 sends a connection detection CC signal to the vehicle-mounted charger OBC1 through a CAN bus, and the battery management system BMS3 sends a charging current demand signal, a charging voltage demand signal and a charging control CP signal to the vehicle-mounted charger OBC1 through the CAN bus; the VCU2 sends a command of closing the slow charging relay to the high-voltage distribution box PDU6, and the high-voltage distribution box PDU6 receives the command and feeds back a closing signal of the slow charging relay to the VCU2 of the vehicle controller; the OBC1 judges the maximum current that the charging gun and the charging cable can bear according to the values of the received charging current demand signal, the charging voltage demand signal, the connection detection CC signal and the charging control CP signal, and dynamically adjusts the output power according to the AC voltage value at the input side to ensure that the current at the input AC side does not exceed the limit value of the system.
The step 3: in the power-off process, in the normal power-off process, the power-off process is as follows when the power battery pack 4 is fully charged:
when the charging system is normally charged, the battery management system BMS3 monitors the monomer voltage of the power battery in real time, when the monomer voltage reaches a preset maximum value, the battery management system BMS3 firstly reduces a charging current demand signal and a charging voltage demand signal to 0, when the vehicle-mounted charger OBC1 receives the charging current demand signal and the charging voltage demand signal, the output current is reduced to 0, data are sent through a CAN bus, the battery management system BMS3 sends a shutdown instruction to the vehicle-mounted charger OBC1 after receiving the data, and the vehicle-mounted charger OBC1 waits after receiving the shutdown instruction; at this time, the 220V alternating current of the alternating current charging gun 51 is controlled to be disconnected, the on-board charger OBC1 is completely in a shutdown state after the 220V alternating current is disconnected, the battery management system BMS3 requests the vehicle control unit VCU2 to disconnect the slow charging relay at this time, the vehicle control unit VCU2 sends a command of disconnecting the slow charging relay to the high-voltage distribution box PDU6 after receiving the command, the high-voltage distribution box PDU6 receives the command of disconnecting the slow charging relay and feeds the state of the relay back to the CAN bus, and power-off is completed at this time.
The step 3: in the power-off process, in the normal power-off process, when the charging button of the ac charging pile 5 is manually pressed or the ac charging gun 51 is manually pulled out, the power-off process is as follows:
when the charging system normally charges, when a charging stop button of the alternating current charging pile 5 is manually pressed or the alternating current charging gun 51 is manually pulled out, the duty ratio of a charging control CP signal of the alternating current charging gun 51 or the alternating current charging pile 5 is 0% or 100%, when the battery management system BMS3 receives the charging control CP signal, the charging is immediately stopped, the battery management system BMS3 firstly reduces a charging current demand signal and a charging voltage demand signal to 0, when the vehicle-mounted charger OBC1 receives the charging current demand signal and the charging voltage demand signal, the output current is reduced to 0, data are sent through a CAN bus, the battery management system BMS3 sends a stop instruction to the vehicle-mounted charger OBC1 after receiving the data, and the vehicle-mounted charger OBC1 waits after receiving the stop instruction; the battery management system BMS3 requests the vehicle control unit VCU2 to disconnect the slow charging relay at the moment, the vehicle control unit VCU2 sends a command of disconnecting the slow charging relay to the high-voltage distribution box PDU6 after receiving the command, the high-voltage distribution box PDU6 receives the command of disconnecting the slow charging relay and feeds the state of the relay back to the CAN bus, and power-off is completed at the moment.
The step 3: in the power-off process, the abnormal power-off process further comprises:
f. the connection detection CC signal and the charging control CP signal which are sent by the vehicle control unit VCU2 and the battery management system BMS3 through the CAN line and received by the vehicle-mounted charger OBC1 are normal, the high-voltage distribution box PDU6 receives a command of closing the slow charging relay of the vehicle control unit VCU2, the high-voltage distribution box PDU6 does not feed back the closing signal of the slow charging relay to the vehicle control unit VCU2, the time delay is 5S, and the vehicle-mounted charger OBC1 reports a fault to the vehicle control unit VCU2 to stop charging;
g. the connection detection CC signal and the charging control CP signal which are sent by the vehicle control unit VCU2 and the battery management system BMS3 through the CAN line and received by the vehicle-mounted charger OBC1 are normal, the high-voltage distribution box PDU6 does not receive the command of closing the slow charging relay of the vehicle control unit VCU2, the time delay is 5S, the vehicle-mounted charger OBC1 reports the fault to the vehicle control unit VCU2, and the charging is stopped;
h. the connection detection CC signal and the charging control CP signal which are sent by the vehicle-mounted charger OBC1 through a CAN line are normal by the vehicle-mounted charger VCU2 and the battery management system BMS3, the high-voltage distribution box PDU6 receives a command of closing the slow charging relay of the vehicle-mounted controller VCU2, the high-voltage distribution box PDU6 feeds back a fault signal of the slow charging relay to the vehicle-mounted controller VCU2, the time is delayed by 5S, and the vehicle-mounted charger OBC1 reports the fault to the vehicle-mounted controller VCU2 to stop charging.
The principle of the invention is illustrated as follows:
this patent can be when keeping the security performance, and alternating voltage fluctuates in the adaptation different regions and makes the car jump the rifle condition at the in-process of filling slowly. The system supports the normal operation of the input voltage in the range of 265-110 VAC.
The OBC judges the maximum current which can be borne by the charging gun and the charging cable according to the values of the received charging current demand signal, the charging voltage demand signal, the connection detection CC signal and the charging control CP signal, and dynamically adjusts the output power according to the alternating current voltage value of the input side so as to ensure that the current input to the alternating current side does not exceed the limit value of the system; because the power grid voltage is lower than 200V for power supply in peak power utilization time in some areas, when the OBC is in slow charging operation at the present state, the OBC performs voltage and current distribution through the power required by the BMS of the power battery pack, in short, the OBC performs constant power charging, when the voltage provided by the power grid is lower than 200V, the BMS required power is unchanged, so that the current input into the OBC may exceed the set value of the primary protection current of the alternating current charging gun, even more, the current input into the OBC may exceed the set value of the secondary protection current, and when the current input into the OBC exceeds the maximum current allowed by the charging gun, the control box of the alternating current gun cuts off the alternating current charging for protecting the alternating current gun. Thereby affecting the customer experience and product satisfaction.
Example 1:
a control method of a vehicle-mounted charger of a pure electric vehicle is based on a whole vehicle charging system: whole car charging system includes: the vehicle-mounted charger OBC1, the vehicle control unit VCU2, the battery management system BMS3 and the power battery pack 4, wherein a slow charging socket 11 is arranged on the vehicle-mounted charger OBC1, the slow charging socket 11 is electrically communicated with an alternating current input interface of the vehicle-mounted charger OBC1 through an alternating current wiring harness, and a direct current output end of the vehicle-mounted charger OBC1 is electrically connected with the power battery pack 4; the connection detection CC signal output end of the slow charging socket 11 is in signal connection with the connection detection CC signal input end of the vehicle control unit VCU2, the charge control CP signal output end of the slow charging socket 11 is in signal connection with the charge control CP signal input end of the battery management system BMS3, and CAN signal interfaces of the vehicle-mounted charger OBC1, the vehicle control unit VCU2 and the battery management system BMS3 are in signal connection with a CAN bus; the awakening signal output end of the VCU2 of the vehicle controller is in signal connection with the awakening signal input end of the BMS 3; the slow charging socket 11 is matched with an alternating current charging gun 51 of the alternating current charging pile 5 in an inserting manner, and the alternating current charging pile 5 is electrically connected with the slow charging socket 11 through the alternating current charging gun 51;
the control method comprises the following steps:
step 1: go up the electric flow, exchange and charge 51 behind the rifle and be connected with slow charging socket 11 electricity, alternating current signal awakens up whole car charging system: the slow charging socket 11 sends a connection detection CC signal to a vehicle control unit VCU2 through a CC signal hard wire, the vehicle control unit VCU2 receives the connection detection CC signal and then wakes up for self-detection, the vehicle control unit VCU2 sends a wake-up signal to a battery management system BMS3 after self-detection is no problem, the battery management system BMS3 wakes up and then carries out self-detection, the battery management system BMS3 receives a charging control CP signal sent by the slow charging socket 11 after self-detection is no problem, the battery management system BMS3 closes an internal switch after detecting that the duty ratio of the charging control CP signal is normal, the alternating current charging pile 5 detects that the internal switch of the battery management system BMS3 is closed, controls alternating current 220V voltage to be output to a vehicle-mounted charger OBC1, the vehicle-mounted charger OBC1 automatically wakes up and is in a standby state after detecting the alternating current 220V voltage, and the power-on process is finished and then enters the next step;
step 2: the working process comprises the steps that after the vehicle control unit VCU2 and the battery management system BMS3 are self-checked and have no problem, the vehicle control unit VCU2 sends a connection detection CC signal to the vehicle-mounted charger OBC1 through a CAN bus, and the battery management system BMS3 sends a charging current demand signal, a charging voltage demand signal and a charging control CP signal to the vehicle-mounted charger OBC1 through the CAN bus; the OBC1 judges the maximum current that the charging gun and the charging cable can bear according to the values of the received charging current demand signal, charging voltage demand signal, connection detection CC signal and charging control CP signal, detects the AC voltage value at the input side in real time to dynamically adjust the output power, so as to ensure that the current at the input AC side does not exceed the limit value of the system;
and step 3: the power-off process comprises a normal power-off process and an abnormal power-off process;
the abnormal lower current path is as follows: the electrifying process is normal, when the OBC1 finds that the received signal is abnormal or the OBC is in fault in the charging process, the OBC1 reports the fault and stops charging;
a. when the connection detection CC signal loss and the charging control CP signal are normal, which are sent by the vehicle controller VCU2 and the battery management system BMS3 through a CAN line and received by the vehicle-mounted charger OBC 1;
b. when the connection detection CC signals sent by the VCU2 of the vehicle control unit and the BMS3 of the battery management system through the CAN line are normal and the charging control CP signals are lost, which are received by the OBC1 of the vehicle-mounted charger;
c. when the connection detection CC signal and the charging control CP signal which are sent by the vehicle controller VCU2 and the battery management system BMS3 through the CAN line and received by the vehicle-mounted charger OBC1 are lost;
d. when the connection detection CC signals sent by the vehicle control unit VCU2 and the battery management system BMS3 through the CAN line and received by the vehicle-mounted charger OBC1 are normal, and the duty ratio of the charging control CP signal value is lower than 8% or higher than 90%;
e. the method comprises the following steps that connection detection CC signals and charging control CP signals sent by a vehicle control unit VCU2 and a battery management system BMS3 through CAN lines and received by a vehicle-mounted charger OBC1 are normal, the vehicle-mounted charger OBC1 receives charging current demand signals and charging voltage demand signals sent by a battery management system BMS3 and is normal, when a fault occurs in the vehicle-mounted charger, the fault is reported, and charging is stopped;
the normal power-off process comprises the following steps: when the power battery pack 4 is fully charged, or the alternating current charging pile 5 is manually pressed to stop the charging button or the alternating current charging gun 51 is manually pulled out, the vehicle-mounted charger OBC1 stops charging.
Example 2:
example 2 is substantially the same as example 1 except that:
the step 2: in the work flow, the method comprises the following steps of,
when the vehicle-mounted charger OBC1 is connected with the 10A alternating-current charging pile 5, the vehicle-mounted charger OBC1 adjusts output power in real time and collects input voltage in real time to control input current not to exceed 8A;
when the on-board charger OBC1 is connected with the 16A alternating-current charging pile 5, the on-board charger OBC1 adjusts output power in real time and collects input voltage in real time to control input current not to exceed 13A;
when the on-board charger OBC1 is connected with the AC charging pile 5 of 32A, the on-board charger OBC1 adjusts output power in real time and collects input voltage in real time to control input current not to exceed 32A.
Example 3:
example 3 is substantially the same as example 2 except that:
the direct current output end of the vehicle-mounted charger OBC1 is electrically connected with the power battery pack 4 through a high-voltage distribution box PDU6, and a CAN signal interface of the high-voltage distribution box PDU6 is connected with a CAN bus signal.
The step 2: in the working process, when the vehicle control unit VCU2 and the battery management system BMS3 are self-checked and have no problem, the vehicle control unit VCU2 sends a connection detection CC signal to the vehicle-mounted charger OBC1 through a CAN bus, and the battery management system BMS3 sends a charging current demand signal, a charging voltage demand signal and a charging control CP signal to the vehicle-mounted charger OBC1 through the CAN bus; the VCU2 sends a command of closing the slow charging relay to the high-voltage distribution box PDU6, and the high-voltage distribution box PDU6 receives the command and feeds back a closing signal of the slow charging relay to the VCU2 of the vehicle controller; the OBC1 judges the maximum current that the charging gun and the charging cable can bear according to the values of the received charging current demand signal, the charging voltage demand signal, the connection detection CC signal and the charging control CP signal, and dynamically adjusts the output power according to the AC voltage value at the input side to ensure that the current at the input AC side does not exceed the limit value of the system.
The step 3: in the power-off process, the abnormal power-off process further comprises:
f. the connection detection CC signal and the charging control CP signal which are sent by the vehicle control unit VCU2 and the battery management system BMS3 through the CAN line and received by the vehicle-mounted charger OBC1 are normal, the high-voltage distribution box PDU6 receives a command of closing the slow charging relay of the vehicle control unit VCU2, the high-voltage distribution box PDU6 does not feed back the closing signal of the slow charging relay to the vehicle control unit VCU2, the time delay is 5S, and the vehicle-mounted charger OBC1 reports a fault to the vehicle control unit VCU2 to stop charging;
g. the connection detection CC signal and the charging control CP signal which are sent by the vehicle control unit VCU2 and the battery management system BMS3 through the CAN line and received by the vehicle-mounted charger OBC1 are normal, the high-voltage distribution box PDU6 does not receive the command of closing the slow charging relay of the vehicle control unit VCU2, the time delay is 5S, the vehicle-mounted charger OBC1 reports the fault to the vehicle control unit VCU2, and the charging is stopped;
h. the connection detection CC signal and the charging control CP signal which are sent by the vehicle control unit VCU2 and the battery management system BMS3 through the CAN line and received by the vehicle-mounted charger OBC1 are normal, the high-voltage distribution box PDU6 receives a command of closing the slow charging relay of the vehicle control unit VCU2, the high-voltage distribution box PDU6 feeds back a fault signal of the slow charging relay to the vehicle control unit VCU2, the time delay is 5S, and the vehicle-mounted charger OBC1 reports the fault to the vehicle control unit VCU2 to stop charging;
in the normal power-off process, the power-off process is as follows when the power battery pack 4 is fully charged:
when the charging system is normally charged, the battery management system BMS3 monitors the monomer voltage of the power battery in real time, when the monomer voltage reaches a preset maximum value, the battery management system BMS3 firstly reduces a charging current demand signal and a charging voltage demand signal to 0, when the vehicle-mounted charger OBC1 receives the charging current demand signal and the charging voltage demand signal, the output current is reduced to 0, data are sent through a CAN bus, the battery management system BMS3 sends a shutdown instruction to the vehicle-mounted charger OBC1 after receiving the data, and the vehicle-mounted charger OBC1 waits after receiving the shutdown instruction; at this time, the 220V alternating current of the alternating current charging gun 51 is controlled to be disconnected, the on-board charger OBC1 is completely in a shutdown state after the 220V alternating current is disconnected, the battery management system BMS3 requests the vehicle control unit VCU2 to disconnect the slow charging relay at this time, the vehicle control unit VCU2 sends a command of disconnecting the slow charging relay to the high-voltage distribution box PDU6 after receiving the command, the high-voltage distribution box PDU6 receives the command of disconnecting the slow charging relay and feeds the state of the relay back to the CAN bus, and power-off is completed at this time.
When the charging button of the ac charging pile 5 is pressed manually or the ac charging gun 51 is pulled out manually, the current is drawn as follows:
when the charging system normally charges, when a charging stop button of the alternating current charging pile 5 is manually pressed or the alternating current charging gun 51 is manually pulled out, the duty ratio of a charging control CP signal of the alternating current charging gun 51 or the alternating current charging pile 5 is 0% or 100%, when the battery management system BMS3 receives the charging control CP signal, the charging is immediately stopped, the battery management system BMS3 firstly reduces a charging current demand signal and a charging voltage demand signal to 0, when the vehicle-mounted charger OBC1 receives the charging current demand signal and the charging voltage demand signal, the output current is reduced to 0, data are sent through a CAN bus, the battery management system BMS3 sends a stop instruction to the vehicle-mounted charger OBC1 after receiving the data, and the vehicle-mounted charger OBC1 waits after receiving the stop instruction; the battery management system BMS3 requests the vehicle control unit VCU2 to disconnect the slow charging relay at the moment, the vehicle control unit VCU2 sends a command of disconnecting the slow charging relay to the high-voltage distribution box PDU6 after receiving the command, the high-voltage distribution box PDU6 receives the command of disconnecting the slow charging relay and feeds the state of the relay back to the CAN bus, and power-off is completed at the moment.
Claims (8)
1. A control method of a vehicle-mounted charger of a pure electric vehicle is characterized by comprising the following steps:
the control method is based on a whole vehicle charging system: whole car charging system includes: the system comprises a vehicle-mounted charger OBC (1), a vehicle control unit VCU (2), a battery management system BMS (3) and a power battery pack (4), wherein a slow charging socket (11) is arranged on the vehicle-mounted charger OBC (1), the slow charging socket (11) is electrically communicated with an alternating current input interface of the vehicle-mounted charger OBC (1) through an alternating current wiring harness, and a direct current output end of the vehicle-mounted charger OBC (1) is electrically connected with the power battery pack (4); the connection detection CC signal output end of the slow charging socket (11) is in signal connection with the connection detection CC signal input end of the vehicle control unit VCU (2), the charging control CP signal output end of the slow charging socket (11) is in signal connection with the charging control CP signal input end of the battery management system BMS (3), and CAN signal interfaces of the vehicle-mounted charger OBC (1), the vehicle control unit VCU (2) and the battery management system BMS (3) are in signal connection with a CAN bus; the awakening signal output end of the VCU (2) of the vehicle control unit is in signal connection with the awakening signal input end of the BMS (3); the slow charging socket (11) is matched with an alternating current charging gun (51) of the alternating current charging pile (5) in an inserting mode, and the alternating current charging pile (5) is electrically connected with the slow charging socket (11) through the alternating current charging gun (51);
the control method comprises the following steps:
step 1: go up the electric flow, exchange and charge rifle (51) and insert the rifle after with slowly charging socket (11) electricity and be connected, exchange signal of telecommunication and awaken up whole car charging system: the slow charging socket (11) sends a connection detection CC signal to a vehicle control unit VCU (2) through a CC signal hard wire, the vehicle control unit VCU (2) is awakened to perform self-detection after receiving the connection detection CC signal, the vehicle control unit VCU (2) sends an awakening signal to a battery management system BMS (3) after self-detection is free of problems, the battery management system BMS (3) performs self-detection after being awakened, the battery management system BMS (3) receives a charging control CP signal sent by the slow charging socket (11) after self-detection is free of problems, the battery management system BMS (3) closes an internal switch after detecting that the duty ratio of the charging control CP signal is normal, an alternating current charging pile (5) controls an alternating current 220V voltage to be output to a vehicle-mounted charger OBC (1) after detecting that the internal switch of the battery management system BMS (3) is closed, the vehicle-mounted charger OBC (1) automatically awakens and is in a standby state after detecting the alternating current 220V voltage, at this time, the power-on process is ended and the next step is carried out;
step 2: the method comprises the following steps that in the working process, when the vehicle control unit VCU (2) and the battery management system BMS (3) are self-checked and have no problem, the vehicle control unit VCU (2) sends a connection detection CC signal to the vehicle-mounted charger OBC (1) through a CAN bus, and the battery management system BMS (3) sends a charging current demand signal, a charging voltage demand signal and a charging control CP signal to the vehicle-mounted charger OBC (1) through the CAN bus; the OBC (1) of the vehicle-mounted charger judges the maximum current which can be borne by a charging gun and a charging cable according to the received values of a charging current demand signal, a charging voltage demand signal, a connection detection CC signal and a charging control CP signal, and detects the value of an alternating current voltage at an input side in real time to dynamically adjust output power so as to ensure that the current input to the alternating current side does not exceed the limit value of a system;
and step 3: the power-off process comprises a normal power-off process and an abnormal power-off process;
the abnormal lower current path is as follows: the charging process is normal, when the OBC (1) finds that the received signal is abnormal or the OBC (1) has a fault in the charging process, the OBC (1) reports the fault and stops charging;
and (3) normal power-off process: when the power battery pack (4) is full of electricity or the alternating current charging pile (5) is manually pressed to stop the charging button or the alternating current charging gun (51) is manually pulled out, the vehicle-mounted charger OBC (1) stops charging.
2. The control method of the vehicle-mounted charger of the pure electric vehicle according to claim 1, characterized by comprising the following steps:
the step 2: in the work flow, the method comprises the following steps of,
when the vehicle-mounted charger OBC (1) is connected with the 10A alternating-current charging pile (5), the vehicle-mounted charger OBC (1) adjusts output power in real time and collects input voltage in real time to control input current not to exceed 8A;
when the on-board charger OBC (1) is connected with the 16A alternating-current charging pile (5), the on-board charger OBC (1) adjusts output power in real time and collects input voltage in real time to control input current not to exceed 13A;
when the on-board charger OBC (1) is connected with the 32A alternating-current charging pile (5), the on-board charger OBC (1) adjusts output power in real time and collects input voltage in real time to control input current not to exceed 32A.
3. The control method of the vehicle-mounted charger of the pure electric vehicle according to claim 2, characterized by comprising the following steps:
the step 3: in the power-off process, the abnormal power-off process refers to: the electrifying process is normal, and one of the following abnormal conditions is generated to judge a fault and stop charging:
a. when a vehicle-mounted charger OBC (1) receives a connection detection CC signal loss and a charging control CP signal normal sent by a vehicle control unit VCU (2) and a battery management system BMS (3) through a CAN line;
b. when a connection detection CC signal is normal and a charging control CP signal is lost, which are sent by a vehicle controller VCU (2) and a battery management system BMS (3) through a CAN line and received by a vehicle-mounted charger OBC (1);
c. when a connection detection CC signal and a charging control CP signal which are sent by a vehicle controller VCU (2) and a battery management system BMS (3) through a CAN (controller area network) line and received by a vehicle-mounted charger OBC (1) are lost;
d. when a connection detection CC signal sent by a vehicle control unit VCU (2) and a battery management system BMS (3) through a CAN (controller area network) line received by a vehicle-mounted charger OBC (1) is normal and the duty ratio of a charging control CP signal value is lower than 8% or higher than 90%;
e. the connection detection CC signal and the charging control CP signal sent by the VCU (2) of the vehicle control unit and the BMS (3) through the CAN line received by the OBC (1) of the vehicle-mounted charger are normal, the OBC (1) of the vehicle-mounted charger receives the charging current demand signal and the charging voltage demand signal sent by the BMS (3) and are normal, and when the inside of the OBC of the vehicle-mounted charger breaks down, the OBC of the vehicle-mounted charger reports the breakdown and stops charging.
4. The control method of the vehicle-mounted charger of the pure electric vehicle according to claim 1, 2 or 3, characterized by comprising the following steps:
the direct current output end of the vehicle-mounted charger OBC (1) is electrically connected with the power battery pack (4) through the over-high voltage distribution box PDU (6), and a CAN signal interface of the high voltage distribution box PDU (6) is connected with a CAN bus signal.
5. The control method of the vehicle-mounted charger of the pure electric vehicle according to claim 4, characterized by comprising the following steps:
the step 2: in the working process, when the vehicle control unit VCU (2) and the battery management system BMS (3) are self-checked without problems, the vehicle control unit VCU (2) sends a connection detection CC signal to the vehicle-mounted charger OBC (1) through a CAN bus, and the battery management system BMS (3) sends a charging current demand signal, a charging voltage demand signal and a charging control CP signal to the vehicle-mounted charger OBC (1) through the CAN bus; the vehicle control unit VCU (2) sends a command of closing the slow charging relay to the high-voltage distribution box PDU (6), and the high-voltage distribution box PDU (6) feeds back a closing signal of the slow charging relay to the vehicle control unit VCU (2) after receiving the command; the OBC (1) of the vehicle-mounted charger judges the maximum current which can be borne by the charging gun and the charging cable according to the received values of the charging current demand signal, the charging voltage demand signal, the connection detection CC signal and the charging control CP signal, and dynamically adjusts the output power according to the value of the alternating current voltage at the input side so as to ensure that the current input to the alternating current side does not exceed the limit value of the system.
6. The control method of the vehicle-mounted charger of the pure electric vehicle according to claim 5, characterized by comprising the following steps:
the step 3: in the power-off process, in the normal power-off process, when the power battery pack (4) is fully charged, the power-off process is as follows:
when the charging system is normally charged, the battery management system BMS (3) monitors the monomer voltage of the power battery in real time, when the monomer voltage reaches a preset maximum value, the battery management system BMS (3) firstly reduces a charging current demand signal and a charging voltage demand signal to 0, when the vehicle-mounted charger OBC (1) receives the charging current demand signal and the charging voltage demand signal, the output current output voltage is reduced to 0, data are sent through a CAN bus, the battery management system BMS (3) sends a shutdown instruction to the vehicle-mounted charger OBC (1) after receiving the data, and the vehicle-mounted charger OBC (1) stands by after receiving the shutdown instruction; the 220V alternating current of control interchange charging gun (51) breaks off this moment, on-vehicle charger OBC (1) is in the shutdown state completely after the 220V alternating current breaks off, battery management system BMS (3) request vehicle control unit VCU (2) to break off the relay that slowly charges this moment, vehicle control unit VCU (2) send the instruction of breaking off the relay that slowly charges for high-voltage distribution box PDU (6) after receiving the instruction, high-voltage distribution box PDU (6) receive the instruction and break off the relay that slowly charges and feed back the relay state to the CAN bus, the electricity is accomplished down this moment.
7. The control method of the vehicle-mounted charger of the pure electric vehicle according to claim 6, characterized by comprising the following steps:
the step 3: in the power-off process, in the normal power-off process, when the charging button of the alternating current charging pile (5) is pressed manually to stop charging or the alternating current charging gun (51) is pulled out manually, the power-off process is as follows:
when the charging system is normally charged, when the charging button of the alternating current charging pile (5) is manually pressed to stop charging or the alternating current charging gun (51) is manually pulled out, the duty ratio of the charging control CP signal of the alternating current charging gun (51) or the alternating current charging pile (5) is 0% or 100%, the charging is immediately stopped when the battery management system BMS (3) receives the charging control CP signal, the duty ratio of the charging control CP signal is 0% or 100%, the charging current demand signal and the charging voltage demand signal are reduced to 0 by the battery management system BMS (3), when the on-board charger OBC (1) receives the charging current demand signal and the charging voltage demand signal, the output current output voltage is reduced to 0, the data are sent through a CAN bus, a battery management system BMS (3) sends a stop instruction to a vehicle-mounted charger OBC (1) after receiving the data, and the vehicle-mounted charger OBC (1) stands by after receiving the stop instruction; the battery management system BMS (3) requests the VCU (2) of the vehicle control unit to disconnect the slow charging relay at the moment, the VCU (2) of the vehicle control unit sends a command of disconnecting the slow charging relay to the high-voltage distribution box PDU (6) after receiving the command, the high-voltage distribution box PDU (6) receives the command of disconnecting the slow charging relay and feeds the state of the relay back to the CAN bus, and power-off is completed at the moment.
8. The control method of the vehicle-mounted charger of the pure electric vehicle according to claim 7, characterized by comprising the following steps:
the step 3: in the power-off process, the abnormal power-off process further comprises:
f. the method comprises the following steps that connection detection CC signals and charging control CP signals sent by a vehicle control unit VCU (2) and a battery management system BMS (3) through CAN lines received by an on-board charger OBC (1) are normal, a high-voltage distribution box PDU (6) receives a command of closing a slow charging relay of the vehicle control unit VCU (2), the high-voltage distribution box PDU (6) does not feed back the closing signal of the slow charging relay to the vehicle control unit VCU (2), the time delay is 5S, and the on-board charger OBC (1) reports a fault to the vehicle control unit VCU (2) and stops charging;
g. the method comprises the following steps that connection detection CC signals and charging control CP signals sent by a vehicle control unit VCU (2) and a battery management system BMS (3) through CAN lines received by an on-board charger OBC (1) are normal, a high-voltage distribution box PDU (6) does not receive a closed slow charging relay instruction of the vehicle control unit VCU (2), the time is delayed by 5S, and the on-board charger OBC (1) reports a fault to the vehicle control unit VCU (2) to stop charging;
h. the vehicle control unit VCU (2) that on-vehicle machine OBC (1) received, connection detection CC signal, the control CP signal of charging that battery management system BMS (3) sent through the CAN line is normal, high voltage distribution box PDU (6) receive vehicle control unit VCU (2) closed slow charging relay instruction, high voltage distribution box PDU (6) feedback slow charging relay fault signal gives vehicle control unit VCU (2), time delay 5S, on-vehicle machine OBC (1) reports the trouble and gives vehicle control unit VCU (2), stop charging.
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| Publication number | Priority date | Publication date | Assignee | Title |
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