CN112009248B - Power-off method of vehicle-mounted charging system of electric vehicle - Google Patents

Power-off method of vehicle-mounted charging system of electric vehicle Download PDF

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Publication number
CN112009248B
CN112009248B CN202010832314.3A CN202010832314A CN112009248B CN 112009248 B CN112009248 B CN 112009248B CN 202010832314 A CN202010832314 A CN 202010832314A CN 112009248 B CN112009248 B CN 112009248B
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power
obc
bms
vcm
interface
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CN112009248A (en
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肖聪
金力
黎新
汪斌
苏磊
王为才
徐远
林凌
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Dongfeng Automobile Co Ltd
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Dongfeng Automobile Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • 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
    • 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
    • B60L53/20—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 characterised by converters located in the vehicle
    • 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

Abstract

A power-down method of an electric vehicle-mounted charging system comprises a power-down strategy caused by a fault and a normal power-down strategy or both, wherein the power-down strategy caused by the fault comprises the following steps: if the OBC detects that the power-OFF triggering condition is established in the charging process, the OBC stops high-voltage charging firstly, then reports the idle state to the BMS through the OBC _ Status message and returns to the idle state, and then if the ignition switch is in the OFF state, the OBC sends a network management message to the BMS and enables the REQ switch state to be OFF so as to control the first coil, so that the first switch is disconnected, and power-OFF is completed. The design has the advantages that the performability of the power-down step is stronger, and the power-down efficiency is higher.

Description

Power-off method of vehicle-mounted charging system of electric vehicle
Technical Field
The invention relates to a power-down design of vehicle-mounted charging equipment, belongs to the field of new energy, and particularly relates to a power-down method of a vehicle-mounted charging system of an electric vehicle.
Background
With the national requirement on air quality becoming higher and higher, the air quality is a challenge to the automobile industry, so that the development of new energy automobiles is very necessary, the market of new energy automobiles is getting bigger and bigger, and the development potential is huge. The electric automobile drives the vehicle by using electric power as an energy source, can reduce the use of gasoline, and is a development trend of the automobile industry. The vehicle-mounted charging system can supply power to the power battery by converting household alternating current into high-voltage direct current, and flexibly solves the charging problem of the electric automobile, so that the vehicle-mounted charging system is the key point of research in the field of the electric automobiles at present.
The main execution unit of the vehicle-mounted charging system is a vehicle-mounted charger (OBC), the vehicle-mounted charger is fixedly mounted on the electric vehicle, the vehicle-mounted charger has the capability of safely and automatically charging the power battery of the electric vehicle, and the charger can dynamically adjust charging current or voltage parameters according to data provided by a Battery Management System (BMS) and a vehicle control unit (VCM), execute corresponding actions and complete the charging process. However, in the prior art, when the power-off operation is performed, the performability of the operation steps is not strong, which is not only unfavorable for improving the power-off efficiency, but also can cause accidents.
The information disclosed in this background section is only for enhancement of understanding of the general background of the patent application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects and problems of low performability and low power-down efficiency of a power-down step in the prior art, and provides a power-down method of a vehicle-mounted charging system of an electric vehicle, which has high performability and high power-down efficiency of the power-down step.
In order to achieve the above purpose, the technical solution of the invention is as follows: a power-down method of an electric vehicle-mounted charging system is disclosed, and before the power-down method is started, an OBC in the electric vehicle-mounted charging system is charging; the power-off method comprises a power-off strategy caused by faults, wherein the power-off strategy caused by faults is as follows:
If the OBC detects that the power-OFF triggering condition is met in the charging process, the OBC stops high-voltage charging, reports an idle state to the BMS through an OBC _ Status message and returns to the idle state, and then sends a network management message to the BMS if the ignition switch is in an OFF state, and enables the REQ switch to be OFF to control the first coil, so that the first switch is disconnected, and power-OFF is completed;
the vehicle-mounted charging system comprises a power battery, alternating current charging equipment, an OBC, a VCM and a BMS, wherein a low-voltage power supply is connected between BAT + and BAT-interfaces on the OBC, a CC interface and a CP interface on the alternating current charging equipment are respectively connected with the VCM and one end of a diode, the other end of the VCM is connected with a CAN _ H, CAN _ L interface on the OBC, meanwhile, a CAN _ H, CAN _ L interface is connected with the BMS, the other end of the diode is connected with one ends of the CP interface, a first resistor and a second resistor on the OBC, the other end of the second resistor is connected with the BAT-interface, the other end of the first resistor is connected with one end of a first switch in a relay, the other end of the first switch is connected with the BAT-interface, and two ends of a first coil in the relay are respectively connected with a REQ switch and a grounding end.
After the OBC returns to the idle state, if the ignition switch is in the ON state, the idle state is reported to the BMS through the OBC _ Status message, then whether the ignition switch is in the OFF state is checked, if not, the idle state is reported to the BMS through the OBC _ Status message again, … … is circulated in sequence until the ignition switch is checked to be in the OFF state.
In the charging process, the OBC reports the working state to the VCM and the BMS through an OBC _ Status message, and reports the Connected state to the VCM through an OBC _ CPStatus message.
The power-off trigger condition refers to any one of the following condition ranges:
BMS_ChargerWorkingEnable = Not Enable；
VCM_ChargingStopRequest = charging stop；
the detected CP duty ratio is less than 8% or more than 90% or the frequency is abnormal;
BMS _ CVEndCurrent is more than or equal to a set value;
VCM_CCStatus = Disconnect；
VCM _ CableCapture! = 16A or VCM _ CableCapture! = A;
BMS_ChargingStop == charging stop。
the frequency abnormality means that the frequency of the CP is lower than 950 Hz or higher than 1050 Hz.
The BMS _ CVEndCurrent is greater than or equal to the set value, which means that the BMS _ CVEndCurrent is greater than or equal to 0.5A.
The condition range also includes that the CV small current command is larger than the actual output current.
The power-down method further comprises a normal power-down strategy, wherein the normal power-down strategy means that the BMS or the VCM actively gives an instruction to the OBC to require stopping charging.
Compared with the prior art, the invention has the beneficial effects that:
1. In the power-OFF method of the vehicle-mounted charging system of the electric vehicle, the power-OFF strategy caused by faults not only comprises the starting condition of the strategy, namely the power-OFF triggering condition is detected, but also comprises the operation steps after the starting, for example, the high-voltage charging is stopped, then the idle state is reported to the BMS through an OBC _ Status message, and the idle state is returned, and then if the ignition switch is in the OFF state, the OBC sends a network management message to the BMS, and the REQ switch state is OFF to control the first coil, so that the first switch is disconnected, and the power-OFF is completed. Therefore, the method has the advantages of stronger performability of the power-down step and higher power-down efficiency.
2. In the power-down method of the vehicle-mounted charging system of the electric vehicle, the power-down triggering condition in the power-down strategy caused by the fault comprises BMS _ ChargerWorkingEnable = Not Enable; VCM _ ChargingStopRequest = chargingstop; the duty ratio of the detected CP is less than 8% or more than 90% or the frequency is abnormal; BMS _ CVEndCurrent is more than or equal to a set value; VCM _ CCStatus = Disconnect; VCM _ CableCapture! = 16A or VCM _ CableCapture! = A; BMS _ ChargingStop = = chargingStop, and any one of the BMS _ ChargingStop = = chargingStop, power-off operation can be carried out as long as any one of the BMS _ ChargingStop = = chargingStop, the operation content is clear and clear, the reference parameter range is wide, and the power-off necessity and completeness are improved to the maximum extent. Therefore, the power-down effect of the invention is better, and the safety is higher.
3. The power-down method of the vehicle-mounted charging system of the electric vehicle integrally comprises any one or two of a power-down strategy and a normal power-down strategy caused by faults, wherein the normal power-down strategy means that the BMS or the VCM actively sends an instruction to the OBC to require to stop charging, the problems are comprehensively considered, and the application field of the design is improved. Therefore, the invention has wider application range.
Drawings
FIG. 1 is a flow chart of a portion of the operation of the present invention.
FIG. 2 is a flow chart of another part of the operation of the present invention.
Fig. 3 is a schematic connection diagram of the in-vehicle charging system of the present invention.
In the figure: the circuit comprises a first resistor 1, a second resistor 2, a relay 3, a first switch 31, a first coil 32, a low-voltage power supply 4 and a diode 5.
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. 1-3, a power-down method of an electric vehicle charging system, before being turned on, an OBC in the electric vehicle charging system is charging; the power-off method comprises a power-off strategy caused by faults, wherein the power-off strategy caused by faults is as follows:
if the OBC detects that the power-OFF triggering condition is met in the charging process, the OBC stops high-voltage charging, reports the idle state to the BMS through an OBC _ Status message and returns to the idle state, and then sends a network management message to the BMS if the ignition switch is in the OFF state, and enables the REQ switch to be OFF to control the first coil 32, so that the first switch 31 is switched OFF, and power-OFF is completed;
The vehicle-mounted charging system comprises a power battery, alternating current charging equipment, an OBC, a VCM and a BMS, a low-voltage power supply 4 is connected between BAT + and BAT-interfaces on the OBC, the CC interface and the CP interface on the alternating current charging equipment are respectively connected with one end of the VCM and one end of the diode 5, the other end of the VCM is connected with the CAN _ H, CAN _ L interface on the OBC, meanwhile, CAN _ H, CAN _ L interfaces are all connected with BMS, the other end of the diode 5 is connected with one ends of a CP interface, a first resistor 1 and a second resistor 2 on the OBC, the other end of the second resistor 2 is connected with a BAT-interface, the other end of the first resistor 1 is connected with one end of a first switch 31 in the relay 3, the other end of the first switch 31 is connected with the BAT-interface, and two ends of a first coil 32 in the relay 3 are respectively connected with a REQ switch and a grounding end.
After the OBC returns to the idle state, if the ignition switch is in the ON state, the idle state is reported to the BMS through the OBC _ Status message, then whether the ignition switch is in the OFF state is checked, if not, the idle state is reported to the BMS through the OBC _ Status message again, … … is circulated in sequence until the ignition switch is checked to be in the OFF state.
In the charging process, the OBC reports the work state to the VCM and the BMS through the OBC _ Status message, and reports the Connected state to the VCM through the OBC _ CPStatus message.
The power-off triggering condition refers to any one of the following condition ranges:
BMS_ChargerWorkingEnable = Not Enable；
VCM_ChargingStopRequest = charging stop；
the duty ratio of the detected CP is less than 8% or more than 90% or the frequency is abnormal;
BMS _ CVEndCurrent is more than or equal to a set value;
VCM_CCStatus = Disconnect；
VCM _ CableCapture! = 16A or VCM _ CableCapture! = 32A;
BMS_ChargingStop == charging stop。
the frequency abnormality means that the frequency of the CP is lower than 950 Hz or higher than 1050 Hz.
The BMS _ CVEndCurrent is greater than or equal to the set value, which means that the BMS _ CVEndCurrent is greater than or equal to 0.5A.
The condition range also includes that the CV small current command is larger than the actual output current.
The power-down method further comprises a normal power-down strategy, wherein the normal power-down strategy means that the BMS or the VCM actively gives an instruction to the OBC to require stopping charging.
The principle of the invention is illustrated as follows:
in the present invention, CC indicates connection acknowledgement, and CP indicates power acknowledgement.
Referring to fig. 3, the positive electrode and the negative electrode of the power battery in the invention are correspondingly connected with the HV + and HV-interfaces on the OBC, and the L, N, PE interface on the alternating current charging device is correspondingly connected with the AC _ L, AC _ N, GND interface on the OBC one by one.
Example 1:
referring to fig. 3, in hardware, the present invention includes a power battery, an ac charging device, an OBC, a VCM, and a BMS, a low-voltage power supply 4 is connected between BAT + and BAT-interfaces on the OBC, the CC interface and the CP interface on the alternating current charging equipment are respectively connected with one end of the VCM and one end of the diode 5, the other end of the VCM is connected with the CAN _ H, CAN _ L interface on the OBC, meanwhile, CAN _ H, CAN _ L interfaces are all connected with BMS, the other end of the diode 5 is connected with one ends of a CP interface, a first resistor 1 and a second resistor 2 on the OBC, the other end of the second resistor 2 is connected with a BAT-interface, the other end of the first resistor 1 is connected with one end of a first switch 31 in the relay 3, the other end of the first switch 31 is connected with the BAT-interface, and two ends of a first coil 32 in the relay 3 are respectively connected with a REQ switch and a grounding end.
Referring to fig. 1 and 2, in a method aspect, the present invention includes a fault-induced power-down strategy, where the fault-induced power-down strategy includes: if the OBC detects that the power-OFF triggering condition is met in the charging process, the OBC stops high-voltage charging, reports the idle state to the BMS through an OBC _ Status message and returns to the idle state, and then sends a network management message to the BMS if the ignition switch is in the OFF state, and enables the REQ switch to be OFF to control the first coil 32, so that the first switch 31 is switched OFF, and power-OFF is completed; the power-off triggering condition refers to any one of the following condition ranges:
BMS_ChargerWorkingEnable = Not Enable；
VCM_ChargingStopRequest = charging stop；
the duty ratio of the detected CP is less than 8% or more than 90% or the frequency is abnormal;
BMS _ CVEndCurrent is more than or equal to a set value;
VCM_CCStatus = Disconnect；
VCM _ CableCapture! = 16A or VCM _ CableCapture! = 32A;
BMS_ChargingStop == charging stop。
the frequency abnormality means that the frequency of the CP is lower than 950 Hz or higher than 1050 Hz.
The BMS _ CVEndCurrent is greater than or equal to the set value, which means that the BMS _ CVEndCurrent is greater than or equal to 0.5A.
Example 2:
the basic contents are the same as example 1, except that:
the condition range also includes that the CV small current command is larger than the actual output current.
Example 3:
the basic contents are the same as example 1, except that:
The power down method further comprises a normal power down strategy, wherein the normal power down strategy means that the BMS or the VCM actively commands the OBC to stop charging.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.

Claims (7)

1. A power-down method of an electric vehicle-mounted charging system, before being turned on, an OBC in the electric vehicle-mounted charging system being charged, the method comprising the steps of: the power-off method comprises a power-off strategy caused by faults, wherein the power-off strategy caused by faults is as follows:
if the OBC detects that the power-OFF triggering condition is met in the charging process, the OBC stops high-voltage charging, reports the idle state to the BMS through an OBC _ Status message and returns to the idle state, and then sends a network management message to the BMS if the ignition switch is in the OFF state, and enables the REQ switch to be OFF to control the first coil (32), so that the first switch (31) is switched OFF, and power-OFF is completed;
the vehicle-mounted charging system comprises a power battery, an alternating current charging device, an OBC, a VCM and a BMS, wherein a low-voltage power supply (4) is connected between BAT + and BAT-interfaces on the OBC, a CC interface and a CP interface on the alternating current charging device are respectively connected with the VCM and one end of a diode (5), the other end of the VCM is connected with a CAN _ H, CAN _ L interface on the OBC, meanwhile, a CAN _ H, CAN _ L interface is connected with the BMS, the other end of the diode (5) is connected with the CP interface on the OBC, one end of a first resistor (1) and one end of a second resistor (2), the other end of the second resistor (2) is connected with the BAT-interface, the other end of the first resistor (1) is connected with one end of a first switch (31) in a relay (3), the other end of the first switch (31) is connected with the BAT-interface, and two ends of a first coil (32) in the relay (3) are respectively connected with a REQ switch, The grounding ends are connected;
The power-off triggering condition refers to any one of the following condition ranges:
BMS_ChargerWorkingEnable = Not Enable；
VCM_ChargingStopRequest = charging stop；
the duty ratio of the detected CP is less than 8% or more than 90% or the frequency is abnormal;
BMS _ CVEndCurrent is more than or equal to a set value;
VCM_CCStatus = Disconnect；
VCM _ CableCapture! = 16A or VCM _ CableCapture! = 32A;
BMS_ChargingStop == charging stop；
the CC represents a connection acknowledgement, and the CP represents a power acknowledgement; and an L, N, PE interface on the alternating current charging equipment is connected with an AC _ L, AC _ N, GND interface on the OBC in a one-to-one correspondence mode.
2. The power-off method of the vehicle-mounted charging system of the electric vehicle according to claim 1, characterized in that: after the OBC returns to the idle state, if the ignition switch is in the ON state, the idle state is reported to the BMS through an OBC _ Status message, then whether the ignition switch is in the OFF state is checked, if not, the idle state is reported to the BMS through an OBC _ Status message again, … … is cycled in sequence until the ignition switch is checked to be in the OFF state.
3. The power-off method of the vehicle-mounted charging system of the electric vehicle according to claim 1 or 2, characterized by comprising the following steps: in the charging process, the OBC reports the work state to the VCM and the BMS through the OBC _ Status message, and reports the Connected state to the VCM through the OBC _ CPStatus message.
4. The power-off method of the vehicle-mounted charging system of the electric vehicle according to claim 1 or 2, characterized by comprising the following steps: the frequency abnormality means that the frequency of the CP is lower than 950 Hz or higher than 1050 Hz.
5. The power-off method of the vehicle-mounted charging system of the electric vehicle according to claim 1 or 2, characterized by comprising the following steps: the BMS _ CVEndCurrent is greater than or equal to the set value, which means that the BMS _ CVEndCurrent is greater than or equal to 0.5A.
6. The power-off method of the vehicle-mounted charging system of the electric vehicle according to claim 1 or 2, characterized by comprising the following steps: the condition range also includes that the CV small current command is larger than the actual output current.
7. The power-off method of the vehicle-mounted charging system of the electric vehicle according to claim 1 or 2, characterized by comprising the following steps: the power-down method further comprises a normal power-down strategy, wherein the normal power-down strategy means that the BMS or the VCM actively gives an instruction to the OBC to require stopping charging.
CN202010832314.3A 2020-08-18 2020-08-18 Power-off method of vehicle-mounted charging system of electric vehicle Active CN112009248B (en)

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Citations (5)

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Publication number Priority date Publication date Assignee Title
CN105391103A (en) * 2014-08-22 2016-03-09 福特全球技术公司 Off-board charger for high-voltage battery charging
CN106828181A (en) * 2017-04-13 2017-06-13 安费诺汽车连接系统（常州）有限公司 Electric vehicle charge control device
CN107599857A (en) * 2017-08-24 2018-01-19 华南理工大学 A kind of pure electric automobile charging system and charging method based on lithium battery
CN107800164A (en) * 2016-08-30 2018-03-13 丰田自动车株式会社 Charging system and electric vehicle
CN110356232A (en) * 2018-04-09 2019-10-22 郑州宇通客车股份有限公司 A kind of monitoring device and vehicle for vehicle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105391103A (en) * 2014-08-22 2016-03-09 福特全球技术公司 Off-board charger for high-voltage battery charging
CN107800164A (en) * 2016-08-30 2018-03-13 丰田自动车株式会社 Charging system and electric vehicle
CN106828181A (en) * 2017-04-13 2017-06-13 安费诺汽车连接系统（常州）有限公司 Electric vehicle charge control device
CN107599857A (en) * 2017-08-24 2018-01-19 华南理工大学 A kind of pure electric automobile charging system and charging method based on lithium battery
CN110356232A (en) * 2018-04-09 2019-10-22 郑州宇通客车股份有限公司 A kind of monitoring device and vehicle for vehicle

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