CN112009247B - High-voltage power-on method of vehicle-mounted charging system of electric vehicle - Google Patents

High-voltage power-on method of vehicle-mounted charging system of electric vehicle Download PDF

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Publication number
CN112009247B
CN112009247B CN202010832275.7A CN202010832275A CN112009247B CN 112009247 B CN112009247 B CN 112009247B CN 202010832275 A CN202010832275 A CN 202010832275A CN 112009247 B CN112009247 B CN 112009247B
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obc
voltage power
power
state
bms
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CN112009247A (en
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肖聪
汪斌
刘新
金力
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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • 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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A high-voltage power-on method of an electric vehicle-mounted charging system comprises any one or two of a CP awakening high-voltage power-on strategy and a CAN awakening high-voltage power-on strategy, wherein the CP awakening high-voltage power-on strategy and the CAN awakening high-voltage power-on strategy respectively comprise an awakening step, a power-on self-test step, a message reporting idle state step, a message reporting ready state step, a message reporting work state step and a REQ control step, meanwhile, the vehicle-mounted charging system comprises a power battery, alternating current charging equipment, an OBC, a VCM and a BMS, and a REQ switch is arranged on the OBC to control the on-off of a relay so as to start or end a power-on process. The design has the advantages of strong performability of the power-on step and high power-on efficiency.

Description

High-voltage power-on method of vehicle-mounted charging system of electric vehicle
Technical Field
The invention relates to a power-on design of vehicle-mounted charging equipment, belongs to the field of new energy, and particularly relates to a high-voltage power-on 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 high-voltage power is applied, the performability of the operation steps is not strong, which is not beneficial to improving the power-on efficiency, and even causes 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-on efficiency of a power-on step in the prior art, and provides a high-voltage power-on method of an electric vehicle-mounted charging system, which has high performability and high power-on efficiency of the power-on step.
In order to achieve the above purpose, the technical solution of the invention is as follows: a high-voltage power-on method of an electric vehicle-mounted charging system comprises any one or two of a CP (content provider) awakening high-voltage power-on strategy and a CAN (controller area network) awakening high-voltage power-on strategy;
the high-voltage power-on strategy for CP awakening comprises the following steps: after detecting the wake-up signal, the OBC in the dormant state is awakened firstly, then enters power-on self-test, and sends a network management message to awaken the VCM after self-test;
if the power-on self-test is not passed, the OBC reports a fault state through an OBC _ Status message, stores a fault code, enters fault processing, if the power-on self-test is passed, the OBC reports an idle state through the OBC _ Status message firstly, then detects whether first conditions are all satisfied, if the first conditions are all satisfied, reports a ready state through the OBC _ Status message, then detects whether second conditions are all satisfied, if the second conditions are all satisfied, reports a working state through the OBC _ Status message, and after entering the working state, the REQ switch state is firstly turned on to control a coil, so that a switch is closed, and then the OBC outputs voltage and current;
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.
In a CP awakening high-voltage power-on strategy, between reporting an idle state and detecting whether a first type of condition is met, the OBC checks a CP signal, if the CP voltage is not 0, the OBC _ CPStatus is set as Connected, and if not, the OBC _ CPStatus is set as disconnected;
if the CP is Connected, whether the CP is Abnormal is detected, and if the duty or the PWM frequency of the CP is detected not to be within the allowable value range and lasts for 50ms, the OBC _ CPStatus reports the CP Absnormal.
The allowable value range of duty is 8% -90%, and the allowable value range of PWM frequency is 950-1050 Hz.
The first type of condition includes:
the duty of the CP signal ranges from 8% to 90%;
the OBC does not detect the fault of the OBC;
acquiring CC as a connection state and cable capacity of 16A or A by receiving a message sent by the VCM, wherein the message comprises VCM _ CCStatus and VCM _ CableCapacity;
the received message BMS _ ChargerWorkingEnable sent by the BMS is Not Enable, and BMS _ ChargingStop is Normal;
and the received message VCM _ ChargingStopRequest sent by the VCM is not a chargingstop.
The second type of condition includes:
BMS_ChargerWorkingEnable = Enable；
BMS_ChargeCurrentRequest = Valid；
BMS_ChargeVoltageRequest =Valid；
BMS_CVEndCurrent = Valid；
the actual output voltage is less than the voltage requested to be output by the BMS;
VCM_ChargingStopRequest = none；
the OBC does not detect its own failure.
The high-voltage power-on strategy for CAN awakening comprises the following steps: after receiving a CAN message sent by a VCM, the OBC in a dormant state is awakened, then enters power-on self-test, and sends a network management message to a BMS after self-test;
if the power-on self-test is not passed, the OBC reports a fault state through an OBC _ Status message, stores a fault code, enters fault processing, if the power-on self-test is passed, the OBC reports an idle state through the OBC _ Status message firstly, then detects whether first conditions are all satisfied, if the first conditions are all satisfied, reports a ready state through the OBC _ Status message, then detects whether second conditions are all satisfied, if the second conditions are all satisfied, reports a working state through the OBC _ Status message, and after entering the working state, the REQ switch state is firstly turned on to control a coil, so that a switch is closed, and then the OBC outputs voltage and current.
In a CAN awakening high-voltage power-on strategy, between reporting an idle state and detecting whether a first type of condition is met, the OBC checks a CP signal, if the CP voltage is not 0, the OBC _ CPStatus is set as Connected, and if not, the OBC _ CPStatus is set as disconnected;
if the CP is Connected, whether the CP is Abnormal is detected, and if the duty or the PWM frequency of the CP is detected not to be within the allowable value range and lasts for 50ms, the OBC _ CPStatus reports the CP Absnormal.
In a CP-awakening high-voltage power-on strategy and a CAN-awakening high-voltage power-on strategy, after a ready state is reported through an OBC _ Status message, if a trigger condition is detected, the OBC jumps to an idle state first and then continues to detect the CP, and after first conditions are detected to be satisfied, the ready state is reported through the OBC _ Status message.
The trigger condition includes any one of:
the duty of the CP signal is not in the range of 8% -90%;
the PWM frequency range of the CP signal is not in 950-1050 Hz;
the CC is not in a connected state.
And (3) detecting a fault between the trigger condition detection and the second type condition detection, if the fault does not exist in the detection, reporting a fault state by the OBC through an OBC _ Status message, storing a fault code, and entering fault processing.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a high-voltage power-on method of an electric vehicle-mounted charging system, which comprises the steps of any one or two of a CP awakening high-voltage power-on strategy and a CAN awakening high-voltage power-on strategy to adapt to different application requirements, wherein the CP is a hard wire, the CAN is a communication protocol, and in addition, the CP awakening high-voltage power-on strategy and the CAN awakening high-voltage power-on strategy respectively comprise an awakening step, a power-on self-test step, a message reporting idle state step, a message reporting ready state step, a message reporting king state step and a REQ control step. Therefore, the invention not only has stronger performability of the power-on step, but also has higher power-on efficiency.
2. According to the high-voltage electrifying method of the vehicle-mounted charging system of the electric vehicle, whether the first type of condition and the second type of condition are vertical or not needs to be detected respectively before the step of reporting ready state and the step of reporting work state by the message, and the first type of condition and the second type of condition respectively comprise a plurality of judgment contents. Therefore, the invention not only has stronger performability, but also has better electrifying effect.
3. In the high-voltage electrifying method of the electric vehicle-mounted charging system, after the ready state is reported through the OBC _ Status message, if the trigger condition is detected, the OBC jumps to the idle state, the CP is detected again, the previous detection content is repeated, and after the first type of condition is detected to be satisfied, the ready state is reported through the OBC _ Status message. Therefore, the invention has the feedback control function and better power-on effect.
Drawings
Fig. 1 is a flow chart of the operation of the high voltage power-on strategy for CP wake-up in the present invention.
Fig. 2 is a flow chart of the operation of the high voltage power-on strategy of CAN wake-up in the present invention.
FIG. 3 is an enlarged schematic view of a first type of condition in the present invention.
FIG. 4 is an enlarged view of a second type of condition in the present invention.
Fig. 5 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 to 5, a high-voltage power-on method for an electric vehicle-mounted charging system includes any one or both of a CP-awakened high-voltage power-on strategy and a CAN-awakened high-voltage power-on strategy;
the high-voltage power-on strategy for CP awakening comprises the following steps: after detecting the wake-up signal, the OBC in the dormant state is awakened firstly, then enters power-on self-test, and sends a network management message to awaken the VCM after self-test;
if the power-on self-test is not passed, the OBC reports a fault state through an OBC _ Status message, stores a fault code, enters fault processing, if the power-on self-test is passed, the OBC reports an idle state through the OBC _ Status message firstly, then detects whether first conditions are all satisfied, if the first conditions are all satisfied, reports a ready state through the OBC _ Status message, then detects whether second conditions are all satisfied, if the second conditions are all satisfied, reports a work state to the VCM and the BMS through the OBC _ Status message, and after entering the work state, the REQ switch state is firstly turned on to control the first coil 32, so that the first switch 31 is closed, and then the voltage and the current are output by the OBC;
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.
In a CP awakening high-voltage power-on strategy, between reporting an idle state and detecting whether a first type of condition is met, the OBC checks a CP signal, if the CP voltage is not 0, the OBC _ CPStatus is set as Connected, and if not, the OBC _ CPStatus is set as disconnected;
if the CP is Connected, whether the CP is Abnormal is detected, and if the duty or the PWM frequency of the CP is detected not to be within the allowable value range and lasts for 50ms, the OBC _ CPStatus reports the CP Absnormal.
The allowable value range of duty is 8% -90%, and the allowable value range of PWM frequency is 950-1050 Hz.
The first type of condition includes:
the duty of the CP signal ranges from 8% to 90%;
the OBC does not detect the fault of the OBC;
acquiring CC as a connection state and cable capacity of 16A or 32A by receiving a message sent by the VCM, wherein the message comprises VCM _ CCStatus and VCM _ CableCapacity;
the received message BMS _ ChargerWorkingEnable sent by the BMS is Not Enable, and BMS _ ChargingStop is Normal;
and the received message VCM _ ChargingStopRequest sent by the VCM is not a chargingstop.
The second type of condition includes:
BMS_ChargerWorkingEnable = Enable；
BMS_ChargeCurrentRequest = Valid；
BMS_ChargeVoltageRequest =Valid；
BMS_CVEndCurrent = Valid；
the actual output voltage is less than the voltage requested to be output by the BMS;
VCM_ChargingStopRequest = none；
the OBC does not detect its own failure.
The high-voltage power-on strategy for CAN awakening comprises the following steps: after receiving a CAN message sent by a VCM, the OBC in a dormant state is awakened, then enters power-on self-test, and sends a network management message to a BMS after self-test;
if the power-on self-test is not passed, the OBC reports a fault state through an OBC _ Status message, stores a fault code, enters fault processing, if the power-on self-test is passed, the OBC reports an idle state through the OBC _ Status message firstly, then detects whether the first type of conditions are all satisfied, if the first type of conditions are all satisfied, reports a ready state through the OBC _ Status message, then detects whether the second type of conditions are all satisfied, if the second type of conditions are all satisfied, reports a working state through the OBC _ Status message, and after entering the working state, firstly makes the REQ switch state be on to control the first-number coil 32, so that the first-number switch 31 is closed, and then the OBC outputs voltage and current.
In a CAN awakening high-voltage power-on strategy, between reporting an idle state and detecting whether a first type of condition is met, the OBC checks a CP signal, if the CP voltage is not 0, the OBC _ CPStatus is set as Connected, and if not, the OBC _ CPStatus is set as disconnected;
if the CP is Connected, whether the CP is Abnormal is detected, and if the duty or the PWM frequency of the CP is detected not to be within the allowable value range and lasts for 50ms, the OBC _ CPStatus reports the CP Absnormal.
In a CP-awakening high-voltage power-on strategy and a CAN-awakening high-voltage power-on strategy, after a ready state is reported through an OBC _ Status message, if a trigger condition is detected, the OBC jumps to an idle state first and then continues to detect the CP, and after first conditions are detected to be satisfied, the ready state is reported through the OBC _ Status message.
The trigger condition includes any one of:
the duty of the CP signal is not in the range of 8% -90%;
the PWM frequency range of the CP signal is not in 950-1050 Hz;
the CC is not in a connected state.
And (3) detecting a fault between the trigger condition detection and the second type condition detection, if the fault does not exist in the detection, reporting a fault state by the OBC through an OBC _ Status message, storing a fault code, and entering fault processing.
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. 5, the positive electrode and the negative electrode of the power battery 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.
Example 1:
referring to fig. 1, 3, 4 and 5, a high-voltage power-on method of an electric vehicle charging system includes a CP-awakened high-voltage power-on strategy, where the CP-awakened high-voltage power-on strategy is: after detecting the wake-up signal, the OBC in the dormant state is awakened firstly, then enters power-on self-test, and sends a network management message to awaken the VCM after self-test; if the power-on self-test is not passed, the OBC reports a fault state through an OBC _ Status message, stores a fault code, enters fault processing, if the power-on self-test is passed, the OBC reports an idle state through the OBC _ Status message firstly, then detects whether first conditions are all satisfied, if the first conditions are all satisfied, reports a ready state through the OBC _ Status message, then detects whether second conditions are all satisfied, if the second conditions are all satisfied, reports a working state through the OBC _ Status message, and after entering the working state, the REQ switch state is firstly turned on to control the first-number coil 32, so that the first-number switch 31 is closed, and then the voltage and the current are output by the OBC; 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. Wherein:
the first type of conditions includes: the duty of the CP signal ranges from 8% to 90%; the OBC does not detect the fault of the OBC; acquiring that the CC is in a connection state and the cable capacity is 16A or 32A by receiving a message sent by the VCM, wherein the message comprises VCM _ CCStatus and VCM _ CableCapability; the received message BMS _ ChargerWorkingEnable sent by the BMS is Not Enable, and BMS _ ChargingStop is Normal; and the received message VCM _ ChargingStopRequest sent by the VCM is not a chargingstop.
The second type of condition includes:
BMS_ChargerWorkingEnable=Enable；
BMS_ChargeCurrentRequest=Valid；
BMS_ChargeVoltageRequest=Valid；
BMS_CVEndCurrent=Valid；
the actual output voltage is less than the voltage requested to be output by the BMS;
VCM_ChargingStopRequest=none；
the OBC does not detect its own failure.
Example 2:
referring to fig. 1 to 5, a high-voltage power-on method of an electric vehicle-mounted charging system includes a high-voltage power-on strategy awakened by a CAN, where the high-voltage power-on strategy awakened by the CAN is: after receiving a CAN message sent by a VCM, the OBC in a dormant state is awakened, then enters power-on self-test, and sends a network management message to a BMS after self-test; if the power-on self-test is not passed, the OBC reports a fault state through an OBC _ Status message, stores a fault code, enters fault processing, if the power-on self-test is passed, the OBC reports an idle state through the OBC _ Status message firstly, then detects whether first conditions are all satisfied, if the first conditions are all satisfied, reports a ready state through the OBC _ Status message, then detects whether second conditions are all satisfied, if the second conditions are all satisfied, reports a working state through the OBC _ Status message, and after entering the working state, the REQ switch state is firstly turned on to control the first-number coil 32, so that the first-number switch 31 is closed, and then the voltage and the current are output by the OBC; 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. Wherein:
the first type of conditions includes: the duty of the CP signal ranges from 8% to 90%; the OBC does not detect the fault of the OBC; acquiring CC as a connection state and cable capacity of 16A or 32A by receiving a message sent by the VCM, wherein the message comprises VCM _ CCStatus and VCM _ CableCapacity; the received message BMS _ ChargerWorkingEnable sent by the BMS is Not Enable, and BMS _ ChargingStop is Normal; and the received message VCM _ ChargingStopRequest sent by the VCM is not a chargingstop.
The second type of condition includes:
BMS_ChargerWorkingEnable=Enable；
BMS_ChargeCurrentRequest=Valid；
BMS_ChargeVoltageRequest=Valid；
BMS_CVEndCurrent=Valid；
the actual output voltage is less than the voltage requested to be output by the BMS;
VCM_ChargingStopRequest=none；
the OBC does not detect its own failure.
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 (8)

1. A high-voltage power-on method of an electric vehicle-mounted charging system is characterized in that the high-voltage power-on method comprises any one or two of a CP (content provider) awakened high-voltage power-on strategy and a CAN (controller area network) awakened high-voltage power-on strategy;
the high-voltage power-on strategy for CP awakening comprises the following steps: after detecting the wake-up signal, the OBC in the dormant state is awakened firstly, then enters power-on self-test, and sends a network management message to awaken the VCM after self-test;
if the power-on self-test is not passed, the OBC reports a fault state through an OBC _ Status message, stores a fault code, enters fault processing, if the power-on self-test is passed, the OBC reports an idle state through the OBC _ Status message firstly, then detects whether first conditions are all satisfied, if the first conditions are all satisfied, reports a ready state through the OBC _ Status message, then detects whether second conditions are all satisfied, if the second conditions are all satisfied, reports a working state through the OBC _ Status message, and after entering the working state, the REQ switch state is firstly turned on to control a first-number coil (32), so that a first-number switch (31) is closed, and then the OBC outputs voltage and current;
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 CC interface represents connection confirmation, and the CP interface represents power confirmation; 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;
in a CP awakening high-voltage power-on strategy, between reporting an idle state and detecting whether a first type of condition is met, the OBC checks a CP signal, if the CP voltage is not 0, the OBC _ CPStatus is set as Connected, and if not, the OBC _ CPStatus is set as disconnected;
if the CP is Connected, detecting whether the CP is Abnormal, and if the duty or the PWM frequency of the CP is detected to be not within the allowable value range and lasts for 50ms, reporting the CP Abnormal by the OBC _ CPStatus;
the allowable value range of duty is 8% -90%, and the allowable value range of PWM frequency is 950-1050 Hz.
2. The high-voltage power-on method of the vehicle-mounted charging system of the electric vehicle according to claim 1, characterized in that: the first type of condition includes:
the duty of the CP signal ranges from 8% to 90%;
the OBC does not detect the fault of the OBC;
acquiring CC as a connection state and cable capacity of 16A or (32) A by receiving a message sent by the VCM, wherein the message comprises VCM _ CCStatus and VCM _ CableCapacity;
the received message BMS _ ChargerWorkingEnable sent by the BMS is Not Enable, and BMS _ ChargingStop is Normal;
and the received message VCM _ ChargingStopRequest sent by the VCM is not a chargingstop.
3. The high-voltage power-on method of the vehicle-mounted charging system of the electric vehicle according to claim 1, characterized in that: the second type of condition includes:
BMS_ChargerWorkingEnable = Enable；
BMS_ChargeCurrentRequest = Valid；
BMS_ChargeVoltageRequest =Valid；
BMS_CVEndCurrent = Valid；
the actual output voltage is less than the voltage requested to be output by the BMS;
VCM_ChargingStopRequest = none；
the OBC does not detect its own failure.
4. The high-voltage power-on method of the vehicle-mounted charging system of the electric vehicle according to claim 3, characterized in that: the high-voltage power-on strategy for CAN awakening comprises the following steps: after receiving a CAN message sent by a VCM, the OBC in a dormant state is awakened, then enters power-on self-test, and sends a network management message to a BMS after self-test;
if the power-on self-test is not passed, the OBC reports a fault state through an OBC _ Status message, stores a fault code, enters fault processing, if the power-on self-test is passed, the OBC reports an idle state through the OBC _ Status message firstly, then detects whether the first type of conditions are all satisfied, if the first type of conditions are all satisfied, reports a ready state through the OBC _ Status message, then detects whether the second type of conditions are all satisfied, if the second type of conditions are all satisfied, reports a working state through the OBC _ Status message, and after entering the working state, the REQ switch state is firstly turned on to control a first-number coil (32), so that a first-number switch (31) is closed, and then the OBC outputs voltage and current.
5. The high-voltage power-on method of the vehicle-mounted charging system of the electric vehicle according to claim 4, characterized in that: in a CAN awakening high-voltage power-on strategy, between reporting an idle state and detecting whether a first type of condition is met, the OBC checks a CP signal, if the CP voltage is not 0, the OBC _ CPStatus is set as Connected, and if not, the OBC _ CPStatus is set as disconnected;
if the CP is Connected, whether the CP is Abnormal is detected, and if the duty or the PWM frequency of the CP is detected not to be within the allowable value range and lasts for 50ms, the OBC _ CPStatus reports the CP Absnormal.
6. The high-voltage power-on method of the vehicle-mounted charging system of the electric vehicle according to claim 4, characterized in that: in a CP-awakening high-voltage power-on strategy and a CAN-awakening high-voltage power-on strategy, after a ready state is reported through an OBC _ Status message, if a trigger condition is detected, the OBC jumps to an idle state first and then continues to detect the CP, and after first conditions are detected to be satisfied, the ready state is reported through the OBC _ Status message.
7. The high-voltage power-on method of the vehicle-mounted charging system of the electric vehicle according to claim 6, characterized in that: the trigger condition includes any one of:
the duty of the CP signal is not in the range of 8% -90%;
the PWM frequency range of the CP signal is not in 950-1050 Hz;
the CC is not in a connected state.
8. The high-voltage power-on method of the vehicle-mounted charging system of the electric vehicle according to claim 6, characterized in that: and (3) detecting a fault between the trigger condition detection and the second type condition detection, if the fault does not exist in the detection, reporting a fault state by the OBC through an OBC _ Status message, storing a fault code, and entering fault processing.
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