CN112389548B - Electric shock protection method, device and system for direct current charging port and vehicle - Google Patents
Electric shock protection method, device and system for direct current charging port and vehicle Download PDFInfo
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- CN112389548B CN112389548B CN201910703675.5A CN201910703675A CN112389548B CN 112389548 B CN112389548 B CN 112389548B CN 201910703675 A CN201910703675 A CN 201910703675A CN 112389548 B CN112389548 B CN 112389548B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/24—Superstructure sub-units with access or drainage openings having movable or removable closures; Sealing means therefor
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
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- 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
- B60L53/10—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 the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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Abstract
The disclosure relates to a direct-current charging port electric shock protection method, device and system and a vehicle, belongs to the field of vehicles, and can reduce the use of a contactor and effectively perform electric shock protection. A direct current charging port electric shock protection method comprises the following steps: acquiring the state of a direct current charging port cover and the current working condition of a vehicle; and carrying out electric shock protection on the direct current charging port based on the acquired state of the direct current charging port cover and the current working condition of the vehicle.
Description
Technical Field
The disclosure relates to the field of vehicles, in particular to a direct-current charging port electric shock protection method, device and system and a vehicle.
Background
At present, in order to meet the requirement of finger touch prevention of the dc charging port, the scheme shown in fig. 1 is usually adopted, that is, a charging positive electrode contactor K5 and a charging negative electrode contactor K4 are added in a distribution box, and when the entire vehicle is in a power-on mode, the dc charging port is ensured to be disconnected from a high voltage by disconnecting K4 and K5. However, as the fast charging power is higher and higher, the specifications of K4 and K5 become larger and larger, the weight and the arrangement space become larger and larger, the corresponding cost also increases, and when the direct current charging is performed by inserting and robbing, sintering of K4 and K5 is easily caused, and meanwhile, the states of K4 and K5 need to be monitored, the system control becomes relatively complex, and the probability of charging failure increases.
Disclosure of Invention
The purpose of the present disclosure is to provide a method, an apparatus, a system and a vehicle for electric shock protection of a dc charging port, which can solve the above problems.
According to a first embodiment of the present disclosure, there is provided a method for protecting a dc charging port from electric shock, the method including: acquiring the state of a direct current charging port cover and the current working condition of a vehicle; and carrying out electric shock protection on the direct current charging port based on the acquired state of the direct current charging port cover and the current working condition of the vehicle.
Optionally, the vehicle comprises a main contactor for controlling whether the vehicle is high voltage or not, the method further comprises acquiring an anti-theft state of the vehicle; based on the DC charging port cover state that acquires and the current operating mode of vehicle, carry out the protection of the electric shock of DC charging port, include: and under the condition that the current working condition of the vehicle is a parking working condition, if the vehicle is in an anti-theft state or the vehicle is in a high-voltage electric state, controlling the state of the direct-current charging port cover to be in a locked state, and if the vehicle is in a non-anti-theft state, controlling the state of the direct-current charging port cover to be in an unlocked state.
Optionally, the dc charging port electric shock protection is performed based on the obtained dc charging port cover state and the current working condition of the vehicle, including: under the condition that the current working condition of the vehicle is a parking working condition, if the state of the direct current charging opening cover is a locking state, the state of the direct current charging opening cover is controlled to be switched to an unlocking state, and if the state of the direct current charging opening cover is an unlocking state, the state of the direct current charging opening cover is kept to be the unlocking state.
Optionally, the vehicle includes a main contactor for controlling whether the vehicle is powered on or off, and the dc charging port electric shock protection is performed based on the acquired dc charging port cover state and the current operating condition of the vehicle, including: and under the condition that the current working condition of the vehicle is that the vehicle is in an OFF gear but the high voltage power is not yet applied, if the state of the direct current charging opening cover is an unlocking state, the main contactor is controlled to be switched OFF.
Optionally, the vehicle includes a main contactor for controlling whether the vehicle is powered on or off, and the dc charging port electric shock protection is performed based on the acquired dc charging port cover state and the current operating condition of the vehicle, including: acquiring the speed of the vehicle under the condition that the current working condition of the vehicle is a power-on working condition; if the state of the direct current charging opening cover is an unlocking state and the vehicle speed is greater than a preset vehicle speed threshold value, only outputting a prompt about that the direct current charging opening cover is in the unlocking state to a vehicle user; and if the direct current charging port cover state is an unlocking state and the vehicle speed is less than the preset vehicle speed threshold value, controlling the main contactor to be disconnected.
Optionally, the vehicle includes a main contactor for controlling whether the vehicle is high-voltage or not, wherein the dc charging port electric shock protection is performed based on the acquired dc charging port cover state and the current operating condition of the vehicle, including, in case of a fault of the dc charging port cover actuator: if the current working condition of the vehicle is that the vehicle is stopped and the vehicle is OFF but does not enter a power-on process, the main contactor is controlled to be switched OFF no matter the state of the direct-current charging opening cover is in an unlocking state or a locking state; if the current working condition of the vehicle is that the vehicle is in the running process and the vehicle speed is greater than a preset vehicle speed threshold value, only outputting a prompt about the fault of the direct current charging port cover to a vehicle user; and if the current working condition of the vehicle is that the vehicle is in the running process and the vehicle speed is less than a preset vehicle speed threshold value, controlling the main contactor to be disconnected.
Optionally, the vehicle includes a main contactor for controlling whether the vehicle has a high voltage, the method further includes obtaining a voltage at the dc charging port, and performing dc charging port electric shock protection based on the obtained dc charging port cover state and the current operating condition of the vehicle, including: under the condition that the current working condition of the vehicle is a parking working condition and the voltage at the direct current charging port is greater than a finger touch prevention safety voltage threshold, controlling the direct current charging port cover to be in a locking state and disconnecting the main contactor; under the condition that the current working condition of the vehicle is an alternating current charging working condition and the voltage at the direct current charging port is greater than the finger touch prevention safety voltage threshold value, controlling the state of the direct current charging port cover to be a locking state; under the conditions that the current working condition of the vehicle is a power-on working condition, the voltage at the direct current charging port is greater than the finger-touch prevention safety voltage threshold value and the state of the direct current charging port cover is an unlocking state, if the vehicle speed is greater than a preset vehicle speed threshold value, only a prompt that the direct current charging port cover is in the unlocking state is output to a vehicle user; and under the conditions that the current working condition of the vehicle is a power-on working condition, the voltage at the direct current charging port is greater than the finger touch prevention safety voltage threshold value and the state of the direct current charging port cover is an unlocking state, if the vehicle speed is less than the preset vehicle speed threshold value, the main contactor is controlled to be disconnected.
According to a second embodiment of the present disclosure, there is provided a dc charging port electric shock protection device, the device comprising: the acquisition module is used for acquiring the state of the direct current charging port cover and the current working condition of the vehicle; and the control module is used for carrying out electric shock protection on the direct-current charging port based on the acquired state of the direct-current charging port cover and the current working condition of the vehicle.
Optionally, the vehicle comprises a main contactor for controlling whether the vehicle is high-voltage or not, and the obtaining module is further used for obtaining the anti-theft state of the vehicle; the control module is further used for controlling the direct current charging opening cover state to be in a locking state if the vehicle is in an anti-theft state or the vehicle is in a high-voltage electric state under the condition that the current working condition of the vehicle is a parking working condition, and controlling the direct current charging opening cover state to be in an unlocking state if the vehicle is in a non-anti-theft state.
Optionally, the control module is further configured to: under the condition that the current working condition of the vehicle is a parking working condition, if the state of the direct current charging opening cover is a locking state, the state of the direct current charging opening cover is controlled to be switched to an unlocking state, and if the state of the direct current charging opening cover is an unlocking state, the state of the direct current charging opening cover is kept to be the unlocking state.
Optionally, the vehicle comprises a main contactor for controlling whether the vehicle is high voltage or not, the control module further being configured to: and under the condition that the current working condition of the vehicle is that the vehicle is in an OFF gear but the high voltage power is not yet applied, if the state of the direct current charging port cover is an unlocking state, the main contactor is controlled to be switched OFF.
Optionally, the vehicle comprises a main contactor for controlling whether the vehicle is high voltage or not, the control module further being configured to: acquiring the speed of the vehicle under the condition that the current working condition of the vehicle is a power-on working condition; if the state of the direct current charging opening cover is an unlocking state and the vehicle speed is greater than a preset vehicle speed threshold value, only outputting a prompt about that the direct current charging opening cover is in the unlocking state to a vehicle user; and if the direct current charging port cover state is an unlocking state and the vehicle speed is less than the preset vehicle speed threshold value, controlling the main contactor to be disconnected.
Optionally, the vehicle comprises a main contactor for controlling whether the vehicle is high voltage, the control module being further configured to, in the event of a failure of the dc charging flap actuator: if the current working condition of the vehicle is that the vehicle is stopped and the vehicle is OFF but does not enter a power-on process, the main contactor is controlled to be switched OFF no matter the state of the direct-current charging opening cover is in an unlocking state or a locking state; if the current working condition of the vehicle is that the vehicle is in the running process and the vehicle speed is greater than a preset vehicle speed threshold value, only outputting a prompt about the fault of the direct current charging port cover to a vehicle user; and if the current working condition of the vehicle is that the vehicle is in the running process and the vehicle speed is less than a preset vehicle speed threshold value, controlling the main contactor to be disconnected.
Optionally, the vehicle includes a main contactor for controlling whether the vehicle has a high voltage, the obtaining module is further configured to obtain a voltage at the dc charging port, and the control module is further configured to: under the condition that the current working condition of the vehicle is a parking working condition and the voltage at the direct current charging port is greater than a finger touch prevention safety voltage threshold, controlling the direct current charging port cover to be in a locking state and disconnecting the main contactor; under the condition that the current working condition of the vehicle is an alternating current charging working condition and the voltage at the direct current charging port is greater than the finger touch prevention safety voltage threshold value, controlling the state of the direct current charging port cover to be a locking state; under the conditions that the current working condition of the vehicle is a power-on working condition, the voltage at the direct current charging port is greater than the finger-touch prevention safety voltage threshold value and the state of the direct current charging port cover is an unlocking state, if the vehicle speed is greater than a preset vehicle speed threshold value, only a prompt that the direct current charging port cover is in the unlocking state is output to a vehicle user; and under the conditions that the current working condition of the vehicle is a power-on working condition, the voltage at the direct current charging port is greater than the finger touch prevention safety voltage threshold value and the direct current charging port cover is in an unlocking state, if the vehicle speed is less than the preset vehicle speed threshold value, the main contactor is controlled to be disconnected.
According to a third embodiment of the present disclosure, there is provided a dc charging port electric shock protection system, including: the direct current charging port electric shock protection device according to the second embodiment of the disclosure; and the detection module is used for detecting the voltage at the direct-current charging port and sending the detected voltage to the direct-current charging port electric shock protection device.
Optionally, the system further includes a battery pack, the battery pack includes a pre-charging contactor, a pre-charging resistor, a main contactor, a negative switch and a battery module, wherein the pre-charging contactor is connected in parallel with the main contactor after being connected in series with the pre-charging resistor, and the main contactor, the battery module, the negative switch and the dc charging port form a series circuit.
Optionally, the negative switch is one of a contactor, a semiconductor switch.
According to a fourth embodiment of the present disclosure, a vehicle is provided, which includes the dc charging port electric shock protection device according to the second embodiment of the present disclosure or the dc charging port protection system according to the third embodiment of the present disclosure.
Through adopting above-mentioned technical scheme, because carry out the direct current and charge mouthful electric shock protection based on direct current flap state of charging and the current operating mode of vehicle, and need not to use contactor K4 among the prior art, K5, consequently both avoided contactor K4, the shared vehicle space of K5, reduced because of using the cost and the weight that the contactor caused, avoided contactor K4, the charging failure probability that the sintering of K5 brought, but also reduced system control's complexity and can guarantee personnel's safety.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a schematic view of a conventional dc charging port electric shock protection structure.
Fig. 2 shows a flow chart of a dc charging port shock protection method according to an embodiment of the present disclosure.
Fig. 3 shows a schematic block diagram of a dc charging port shock protection device according to an embodiment of the present disclosure.
Fig. 4 shows a schematic block diagram of a dc charging port shock protection system according to an embodiment of the present disclosure.
Fig. 5 shows a schematic circuit diagram of a battery pack according to an embodiment of the present disclosure.
Fig. 6 shows a schematic implementation of a photo-coupler detection circuit according to an embodiment of the present disclosure.
Fig. 7 shows a schematic implementation of a voltage sampling circuit according to an embodiment of the disclosure.
Fig. 8 shows a control schematic of the charge flap actuator and main contactor K2 according to an embodiment of the present disclosure.
Detailed Description
The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 2 shows a flowchart of a method for protecting a dc charging port from electric shock according to an embodiment of the present disclosure, and as shown in fig. 2, the method includes the following steps:
in step S21, acquiring the dc charging port cover state and the current operating condition of the vehicle;
in step S22, based on the acquired state of the dc charging port cover and the current operating condition of the vehicle, dc charging port electric shock protection is performed.
Wherein the dc charging port cover status is obtained from the dc charging port cover actuator.
Through adopting above-mentioned technical scheme, because carry out the direct current and charge mouthful electric shock protection based on direct current flap state of charging and the current operating mode of vehicle, and need not to use contactor K4 among the prior art, K5, consequently both avoided contactor K4, the shared vehicle space of K5, reduced because of using the cost and the weight that the contactor caused, avoided contactor K4, the charging failure probability that the sintering of K5 brought, but also reduced system control's complexity and can guarantee personnel's safety.
Next, how to perform dc charging port electric shock protection based on the acquired dc charging port cover state and the current operating condition of the vehicle will be described in detail.
In one embodiment, when the current operating condition of the vehicle is a parking operating condition (that is, the vehicle is not started by a vehicle starting device such as a key), if the dc charging port cover state is a locked state, the dc charging port cover state is controlled to be switched to an unlocked state, and if the dc charging port cover state is an unlocked state, the dc charging port cover state is maintained to be an unlocked state. That is, control the direct current flap state of charging all the time under the parking operating mode and be the state of unblanking, just so can open the direct current flap of charging at will under the non-theftproof circumstances, conveniently carry out the direct current and charge.
In one embodiment, a vehicle includes a main contactor for controlling whether the vehicle is high voltage, the method according to the disclosed embodiment further includes obtaining an anti-theft state of the vehicle; based on the DC charging port cover state that acquires and the current operating mode of vehicle, carry out the protection of the electric shock of DC charging port, include: and under the condition that the current working condition of the vehicle is a parking working condition, if the vehicle is in an anti-theft state or the vehicle is in a high-voltage electric state, controlling the state of the direct-current charging port cover to be in a locked state, and if the vehicle is in a non-anti-theft state, controlling the state of the direct-current charging port cover to be in an unlocked state. Therefore, the direct-current charging opening cover can be opened at will under the non-anti-theft condition, direct-current charging is convenient to carry out, and the vehicle is protected under the anti-theft condition.
In one embodiment, when the current working condition of the vehicle is that the vehicle is in an OFF gear but the high voltage electricity is not yet generated, if the state of the direct current charging port cover is an unlocking state, a main contactor used for controlling whether the vehicle generates the high voltage electricity or not is controlled to be opened. Therefore, the vehicle is not allowed to enter a power-on state, the DC charging port is ensured to be uncharged, and the electric shock event caused by the fact that personnel touch the DC charging port is prevented. Further, at this time, the user of the vehicle may be reminded by a reminding means such as a vehicle meter, sound, light, or the like, for example, "please close the dc charging port cover" may be displayed on the vehicle meter. If the direct current charging port cover state is a locking state, the main contactor is controlled to be conducted, and the vehicle can enter a normal power-on process. In addition, the embodiment may also be performed on the premise that a failure such as contactor sintering, a serious leakage failure, or the like is not present.
In this disclosure, power-up refers to applying a high voltage to the vehicle.
In addition, the main contactor for controlling whether the vehicle is high or not is referred to in the embodiment of the present disclosure as the main contactor K2 shown in fig. 1. However, in the embodiment of the present disclosure, the main contactor K2, the precharge contactor K1, the precharge resistor R, and the negative contactor K3 shown in fig. 1 may be located in the distribution box as in the related art, but may also be arranged in the battery pack to reduce the use of a high voltage harness and other distribution modules, which will be described in detail later.
In an embodiment, under the condition that the current operating mode of vehicle is the power-on operating mode, the direct current mouth that charges may have certain voltage, consequently has the risk of electrocuteeing, so under this kind of operating mode, direct current charging flap state can avoid personnel's mistake to touch the direct current mouth that charges for the locking state. However, if the acquired state of the dc charging port cover is the unlocked state, the vehicle speed needs to be further acquired, and what electric shock protection method is to be adopted is determined by combining the vehicle speed, that is:
if the state of the direct current charging port cover is an unlocking state and the vehicle speed is greater than a preset vehicle speed threshold value (for example, 10Km/h), only a prompt about that the direct current charging port cover is in the unlocking state is output to a vehicle user, for example, a prompt of 'please close the direct current charging port cover' is output on a vehicle instrument, but at the moment, the main contactor is not controlled to be disconnected, the high voltage is not disconnected, the whole vehicle is still in a running state, and therefore the danger caused by suddenly enabling the whole vehicle to enter a power-off process is avoided;
If the direct current charging port cover state is the unlocking state and the speed of a motor vehicle is less than the preset speed threshold value, the main contactor is controlled to be disconnected, the whole vehicle enters a power-off process, the direct current charging port is guaranteed to be uncharged, and personnel are prevented from touching the direct current charging port to generate an electric shock event.
In an embodiment, except that direct current charge flap state and vehicle current operating mode, can also consider whether direct current charge flap executor has the trouble when carrying out direct current charge mouth electric shock protection, also promptly, under the condition that direct current charge flap executor has the trouble:
if the current working condition of the vehicle is that the vehicle is stopped and the vehicle is OFF but does not enter the electrifying process, the main contactor is controlled to be disconnected no matter the state of the direct current charging port cover is in an unlocking state or a locking state, so that the whole vehicle is not allowed to enter the electrifying process, other contactors are not allowed to be attracted, and the electrifying process is allowed to enter until the fault of the direct current charging port cover actuator is eliminated. In this way, guarantee that the direct current charges the mouth uncharged, prevented that personnel from touching the direct current and charging the mouth and taking place the electric shock incident. And at the moment, the user of the vehicle can be reminded through reminding manners such as a vehicle instrument, sound, light and the like, for example, the 'direct current charging port cover can not be locked' is displayed on the vehicle instrument.
If the current working condition of the vehicle is that the vehicle is in the driving process and the vehicle speed is greater than the preset vehicle speed threshold value, only a prompt about the fault of the direct current charging cover is output to a vehicle user, for example, the fact that the direct current charging cover cannot be locked is displayed on a vehicle instrument, but the disconnection of the main contactor is not controlled at the moment, the high voltage is not disconnected, the whole vehicle is still in the driving state, and therefore the danger caused by the fact that the whole vehicle enters a power-off process suddenly is avoided.
If the current working condition of the vehicle is that the vehicle is in the running process and the vehicle speed is smaller than the preset vehicle speed threshold value, the main contactor is controlled to be disconnected, so that the electric control shut-off wave is realized, the high voltage is disconnected, the direct current charging port is ensured to be uncharged, and the electric shock event caused by the fact that a person touches the direct current charging port is prevented. Furthermore, it is also possible to record a fault code and display, for example, "please check the dc charging flap actuator" on the vehicle instrument.
In an embodiment, in addition to the state of the dc charging port cover and the current operating condition of the vehicle, the voltage at the dc charging port may be considered when performing electric shock protection on the dc charging port, for example, the voltage at the dc charging port may be obtained from a detection circuit such as an optocoupler detection module or a voltage sampling circuit. Namely:
(1) Under the condition that the current working condition of the vehicle is a parking working condition, if the voltage at the direct current charging port is larger than a finger touch prevention safety voltage threshold (for example, 60V or other numerical values), the direct current charging port cover is controlled to be in a locking state, and the main contactor is disconnected. For example, a lock command may be sent to the dc charging flap actuator to cause the dc charging flap actuator to control the locking of the dc charging flap. Therefore, the whole vehicle is not allowed to enter the power-on process, and the safety of the whole vehicle and personnel is ensured. Further, the vehicle user can be reminded of the vehicle through various reminding measures such as a meter, sound, light, and the like. If the voltage in direct current charging mouth department is less than and prevents pointing to touch safe voltage threshold, then can control direct current charging flap state all the time and be the state of unblanking to can open the direct current charging flap at any time, conveniently carry out direct current and charge.
(2) And under the condition that the current working condition of the vehicle is an alternating current charging working condition, if the voltage at the direct current charging port is greater than the finger touch prevention safety voltage threshold value, controlling the state of the direct current charging port cover to be a locking state. Thus, the risk of electric shock of the personnel can be prevented.
(3) The current operating mode of vehicle is the last operating mode the voltage of direct current charging port department is greater than prevent that it touches safe voltage threshold just direct current charging port lid state is under the condition of state of unblanking, if the speed of a motor vehicle is greater than the predetermined speed of a motor vehicle threshold, then only to vehicle user output about direct current charging port lid is the warning of state of unblanking, but does not control the disconnection of main contactor this moment, and the high pressure does not break off, and whole car still is in the state of traveling to avoid making whole car suddenly and get into the danger that the procedure of moving back electricity brought. If the speed of a motor vehicle is less than the preset speed threshold value, the main contactor is controlled to be disconnected, so that the whole vehicle enters a power-off process, the direct-current charging port is ensured to be uncharged, and personnel are prevented from touching the direct-current charging port to cause an electric shock event.
Fig. 3 shows a schematic block diagram of a dc charging port electric shock protection apparatus according to an embodiment of the present disclosure, as shown in fig. 3, the apparatus includes: the acquisition module 31 is used for acquiring the state of the direct current charging port cover and the current working condition of the vehicle; and the control module 32 is used for carrying out electric shock protection on the direct current charging port based on the acquired state of the direct current charging port cover and the current working condition of the vehicle.
Through adopting above-mentioned technical scheme, because carry out the direct current and charge mouthful electric shock protection based on direct current flap state of charging and the current operating mode of vehicle, and need not to use contactor K4 among the prior art, K5, consequently both avoided contactor K4, the shared vehicle space of K5, reduced because of using the cost and the weight that the contactor caused, avoided contactor K4, the charging failure probability that the sintering of K5 brought, but also reduced system control's complexity and can guarantee personnel's safety.
Optionally, the vehicle includes a main contactor for controlling whether the vehicle is high voltage, and the obtaining module 31 is further configured to obtain an anti-theft state of the vehicle; the control module 32 is further configured to, when the current working condition of the vehicle is a parking working condition, control the dc charging port cover state to be in a locked state if the vehicle is in an anti-theft state or the vehicle is in a high-voltage state, and control the dc charging port cover state to be in an unlocked state if the vehicle is in a non-anti-theft state.
Optionally, the control module 32 is further configured to: under the condition that the current working condition of the vehicle is a parking working condition, if the state of the direct current charging opening cover is a locking state, the state of the direct current charging opening cover is controlled to be switched to an unlocking state, and if the state of the direct current charging opening cover is an unlocking state, the state of the direct current charging opening cover is kept to be the unlocking state.
Optionally, the vehicle comprises a main contactor for controlling whether the vehicle is high voltage or not, the control module 32 being further configured to: and under the condition that the current working condition of the vehicle is that the vehicle is in an OFF gear but the high voltage power is not yet applied, if the state of the direct current charging port cover is an unlocking state, the main contactor is controlled to be switched OFF.
Optionally, the vehicle comprises a main contactor for controlling whether the vehicle is high voltage, the control module 32 being further configured to: acquiring the speed of the vehicle under the condition that the current working condition of the vehicle is a power-on working condition; if the state of the direct current charging port cover is the unlocking state and the vehicle speed is greater than a preset vehicle speed threshold value, outputting a prompt about that the direct current charging port cover is in the unlocking state to a vehicle user; and if the direct current charging port cover state is an unlocking state and the vehicle speed is less than the preset vehicle speed threshold value, controlling the main contactor to be disconnected.
Optionally, the vehicle comprises a main contactor for controlling whether the vehicle is high voltage, and the control module 32 is further configured to, in case of a failure of the dc charging flap actuator: if the current working condition of the vehicle is that the vehicle is stopped and the vehicle is OFF-gear but does not enter a power-on process, the main contactor is controlled to be switched OFF no matter the state of the direct-current charging opening cover is in an unlocking state or a locking state; if the current working condition of the vehicle is that the vehicle is in the running process and the vehicle speed is greater than a preset vehicle speed threshold value, only outputting a prompt about the fault of the direct current charging port cover to a vehicle user; and if the current working condition of the vehicle is that the vehicle is in the running process and the vehicle speed is less than a preset vehicle speed threshold value, controlling the main contactor to be disconnected.
Optionally, the vehicle includes a main contactor for controlling whether the vehicle is high voltage, the obtaining module 31 is further configured to obtain the voltage at the dc charging port, and the control module 32 is further configured to: under the condition that the current working condition of the vehicle is a parking working condition and the voltage at the direct current charging port is greater than a finger touch prevention safety voltage threshold value, controlling the direct current charging port cover to be in a locking state and disconnecting the main contactor; under the condition that the current working condition of the vehicle is an alternating current charging working condition and the voltage at the direct current charging port is greater than the finger touch prevention safety voltage threshold value, controlling the state of the direct current charging port cover to be a locking state; under the conditions that the current working condition of the vehicle is a power-on working condition, the voltage at the direct current charging port is greater than the finger-touch prevention safety voltage threshold value and the state of the direct current charging port cover is an unlocking state, if the vehicle speed is greater than a preset vehicle speed threshold value, only a prompt that the direct current charging port cover is in the unlocking state is output to a vehicle user; and under the conditions that the current working condition of the vehicle is a power-on working condition, the voltage at the direct current charging port is greater than the finger touch prevention safety voltage threshold value and the state of the direct current charging port cover is an unlocking state, if the vehicle speed is less than the preset vehicle speed threshold value, the main contactor is controlled to be disconnected.
The dc charging port electric shock protection device according to the embodiments of the present disclosure may be implemented by various types of controllers, such as a microcontroller, a field programmable gate array, a single chip, and the like.
The specific implementation manner of each module included in the dc charging port electric shock protection device according to the embodiment of the present disclosure has been described in detail in the method according to the embodiment of the present disclosure, and is not described herein again.
Fig. 4 shows a schematic block diagram of a dc charging port shock protection system according to an embodiment of the present disclosure, as shown in fig. 4, the system comprising: a dc charging port shock protection device 400, which may be the dc charging port shock protection device described above with reference to fig. 3; the detecting module 401 is configured to detect a voltage at the dc charging port, and send the detected voltage to the dc charging port electric shock protection device 400.
Through adopting above-mentioned technical scheme, because carry out the direct current and charge mouthful electric shock protection based on direct current flap state of charging and the current operating mode of vehicle, and need not to use contactor K4 among the prior art, K5, consequently both avoided contactor K4, the shared vehicle space of K5, reduced because of using the cost and the weight that the contactor caused, avoided contactor K4, the charging failure probability that the sintering of K5 brought, but also reduced system control's complexity and can guarantee personnel's safety.
In an implementation manner, the system according to the embodiment of the present disclosure further includes a battery pack, and fig. 5 illustrates an exemplary circuit schematic diagram of the battery pack, as shown in fig. 5, the battery pack includes a pre-charging contactor K1, a pre-charging resistor R, a main contactor, a negative switch K3, and a battery module, wherein the pre-charging contactor K1 is connected in series with the pre-charging resistor R and then connected in parallel with the main contactor K2, and the main contactor K2, the battery module, the negative switch K3, and the dc charging port form a series circuit. By arranging the pre-charging contactor K1, the pre-charging resistor R, the main contactor, the negative switch K3 and the like inside the battery pack, the use of a high-voltage wire harness and other power distribution modules can be reduced.
In one embodiment, the negative switch K3 is one of a contactor and a semiconductor switch. When negative switch K3 was semiconductor switch, can reduce the use of contactor, reduced contactor failure probability, reduced the whole car cost, can guarantee the personnel safety under the different operating modes simultaneously.
However, when the semiconductor switch is turned on or off, if a large inrush current occurs, the lifetime of the semiconductor switch is severely reduced, so that the lifetime of the semiconductor switch K3 needs to be protected by different timings, which is specifically classified into the following conditions:
Under the AC charging working condition: a Battery Manager (BMC) before ac charging controls the semiconductor switch K3 to be turned on, then controls the contactor K1 to be closed, controls the contactor K2 to be closed after a preset time, and turns off the contactor K1; after the alternating current charging is finished, the contactor K2 is disconnected, and the semiconductor switch K3 is turned off after the preset time;
under the direct current charging working condition: before direct current charging, the BMC controls a semiconductor switch K3 to be conducted, then controls a contactor K1 to be closed, controls a contactor K2 to be closed after preset time, and disconnects a contactor K1; after the direct current charging is finished, the contactor K2 is disconnected, and the semiconductor switch K3 is turned off after the preset time;
under the working condition of external discharge, before the external discharge, the BMC controls the semiconductor switch K3 to be switched on, then controls the contactor K1 to be switched on, controls the contactor K2 to be switched on after preset time, and switches off the contactor K1; after the external discharge is finished, the contactor K2 is disconnected, and the semiconductor switch K3 is turned off after the preset time;
under the normal power-on working condition, before normal power-on, the pre-charging contactor K1 is firstly attracted, the BMC judges that the pre-charging voltage changes, if the voltage continuously rises, the BMC judges that the semiconductor switch K3 has a fault, records a fault code, and stops the pre-charging process; if the voltage is unchanged, the semiconductor switch K3 is controlled to be switched on, the contactor K2 is controlled to be switched on after the preset time, and the contactor K1 is switched off; in the de-electrifying process, the contactor K2 is firstly opened, the contactor K2 is judged to be sintered, and the semiconductor switch K3 is opened after a preset time.
In one embodiment, the detection module 401 may be implemented by using an optical coupling detection circuit, a voltage sampling circuit, and the like, where fig. 6 shows a schematic implementation of the optical coupling detection circuit, and fig. 7 shows a schematic implementation of the voltage sampling circuit, where the resistor R2 in fig. 7 is a sampling resistor.
Fig. 8 shows a control schematic of the charge flap actuator and main contactor K2.
According to still another embodiment of the present disclosure, a vehicle is provided, which includes the dc charging port electric shock protection device according to the embodiment of the present disclosure or the dc charging port protection system according to the embodiment of the present disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure as long as it does not depart from the gist of the present disclosure.
Claims (16)
1. A direct current charging port electric shock protection method is characterized by comprising the following steps:
acquiring the state of a direct current charging port cover and the current working condition of a vehicle;
carrying out electric shock protection on the direct current charging port based on the acquired state of the direct current charging port cover and the current working condition of the vehicle;
wherein, the vehicle is including being used for controlling whether the vehicle goes up the main contactor of high-voltage electricity, then, based on the direct current flap state that charges who obtains and the current operating mode of vehicle, carry out the direct current and charge mouthful electric shock protection, include: in the event of a failure of the dc charging port cover actuator,
if the current working condition of the vehicle is that the vehicle is stopped and the vehicle is OFF but does not enter a power-on process, the main contactor is controlled to be disconnected no matter the state of the direct-current charging cover is in an unlocking state or a locking state;
if the current working condition of the vehicle is that the vehicle is in the running process and the vehicle speed is greater than a preset vehicle speed threshold value, only outputting a prompt about the fault of the direct current charging port cover to a vehicle user;
And if the current working condition of the vehicle is that the vehicle is in the running process and the vehicle speed is less than a preset vehicle speed threshold value, controlling the main contactor to be disconnected.
2. The method of claim 1, wherein a vehicle includes a main contactor for controlling whether the vehicle is high voltage or not, further comprising obtaining an anti-theft status of the vehicle; based on the DC charging port cover state that acquires and the current operating mode of vehicle, carry out the protection of the electric shock of DC charging port, include: in the case where the current operating condition of the vehicle is a parking condition,
if the vehicle is in an anti-theft state or the vehicle is in a high-voltage state, controlling the state of the direct-current charging port cover to be in a locked state;
and if the vehicle is in a non-theft-proof state, controlling the direct current charging opening cover state to be in an unlocking state.
3. The method of claim 1, wherein the performing dc charging port shock protection based on the obtained dc charging port status and the current operating condition of the vehicle comprises:
under the condition that the current working condition of the vehicle is a parking working condition, if the state of the direct current charging opening cover is a locking state, the state of the direct current charging opening cover is controlled to be switched to an unlocking state, and if the state of the direct current charging opening cover is an unlocking state, the state of the direct current charging opening cover is kept to be the unlocking state.
4. The method of claim 1, wherein the vehicle comprises a main contactor for controlling whether the vehicle is charged with high voltage or not, wherein the performing dc charging port shock protection based on the obtained dc charging port cover state and the current operating condition of the vehicle comprises:
and under the condition that the current working condition of the vehicle is that the vehicle is in an OFF gear but the high voltage power is not yet applied, if the state of the direct current charging opening cover is an unlocking state, the main contactor is controlled to be switched OFF.
5. The method of claim 1, wherein the vehicle comprises a main contactor for controlling whether the vehicle is charged with high voltage or not, wherein the performing dc charging port shock protection based on the obtained dc charging port cover state and the current operating condition of the vehicle comprises:
acquiring the speed of the vehicle under the condition that the current working condition of the vehicle is a power-on working condition;
if the state of the direct current charging opening cover is an unlocking state and the vehicle speed is greater than a preset vehicle speed threshold value, only outputting a prompt about that the direct current charging opening cover is in the unlocking state to a vehicle user;
and if the direct current charging port cover state is an unlocking state and the vehicle speed is less than the preset vehicle speed threshold value, controlling the main contactor to be disconnected.
6. The method of claim 1, wherein the vehicle includes a main contactor for controlling whether the vehicle is charged with high voltage or not, the method further comprising obtaining the voltage at the dc charging port, and wherein the dc charging port shock protection based on the obtained dc charging port status and the current vehicle operating condition comprises:
under the condition that the current working condition of the vehicle is a parking working condition and the voltage at the direct current charging port is greater than a finger touch prevention safety voltage threshold, controlling the direct current charging port cover to be in a locking state and disconnecting the main contactor;
under the condition that the current working condition of the vehicle is an alternating current charging working condition and the voltage at the direct current charging port is greater than the finger touch prevention safety voltage threshold value, controlling the state of the direct current charging port cover to be a locking state;
under the conditions that the current working condition of the vehicle is a power-on working condition, the voltage at the direct current charging port is greater than the finger-touch prevention safety voltage threshold value and the state of the direct current charging port cover is an unlocking state, if the vehicle speed is greater than a preset vehicle speed threshold value, only a prompt that the direct current charging port cover is in the unlocking state is output to a vehicle user;
And under the conditions that the current working condition of the vehicle is a power-on working condition, the voltage at the direct current charging port is greater than the finger touch prevention safety voltage threshold value and the state of the direct current charging port cover is an unlocking state, if the vehicle speed is less than the preset vehicle speed threshold value, the main contactor is controlled to be disconnected.
7. The utility model provides a DC mouth that charges electric shock protection device which characterized in that, the device includes:
the acquisition module is used for acquiring the state of the direct current charging port cover and the current working condition of the vehicle;
the control module is used for carrying out electric shock protection on the direct current charging port based on the acquired state of the direct current charging port cover and the current working condition of the vehicle;
wherein the vehicle includes a main contactor for controlling whether the vehicle is high voltage, then the control module is further configured to: in the event of a failure of the dc charging port cover actuator,
if the current working condition of the vehicle is that the vehicle is stopped and the vehicle is OFF but does not enter a power-on process, the main contactor is controlled to be switched OFF no matter the state of the direct-current charging opening cover is in an unlocking state or a locking state;
if the current working condition of the vehicle is that the vehicle is in the running process and the vehicle speed is greater than a preset vehicle speed threshold value, only outputting a prompt about the fault of the direct current charging port cover to a vehicle user;
And if the current working condition of the vehicle is that the vehicle is in the running process and the vehicle speed is less than a preset vehicle speed threshold value, controlling the main contactor to be disconnected.
8. The apparatus of claim 7, wherein a vehicle includes a main contactor for controlling whether the vehicle is high voltage or not,
the acquisition module is also used for acquiring the anti-theft state of the vehicle;
the control module is further used for controlling the direct current charging opening cover state to be in a locking state if the vehicle is in an anti-theft state or the vehicle is in a high-voltage electric state under the condition that the current working condition of the vehicle is a parking working condition, and controlling the direct current charging opening cover state to be in an unlocking state if the vehicle is in a non-anti-theft state.
9. The apparatus of claim 7, wherein the control module is further configured to:
under the condition that the current working condition of the vehicle is a parking working condition, if the state of the direct current charging opening cover is a locking state, the state of the direct current charging opening cover is controlled to be switched to an unlocking state, and if the state of the direct current charging opening cover is an unlocking state, the state of the direct current charging opening cover is kept to be the unlocking state.
10. The apparatus of claim 7, wherein vehicle includes a main contactor for controlling whether the vehicle is high voltage, wherein the control module is further configured to:
and under the condition that the current working condition of the vehicle is that the vehicle is in an OFF gear but the high voltage power is not yet applied, if the state of the direct current charging port cover is an unlocking state, controlling the main contactor to be switched OFF.
11. The apparatus of claim 7, wherein vehicle includes a main contactor for controlling whether the vehicle is high voltage, wherein the control module is further configured to:
acquiring the speed of the vehicle under the condition that the current working condition of the vehicle is a power-on working condition;
if the state of the direct current charging opening cover is an unlocking state and the vehicle speed is greater than a preset vehicle speed threshold value, only outputting a prompt about that the direct current charging opening cover is in the unlocking state to a vehicle user;
and if the direct current charging port cover state is an unlocking state and the vehicle speed is less than the preset vehicle speed threshold value, controlling the main contactor to be disconnected.
12. The apparatus of claim 7, wherein the vehicle includes a main contactor for controlling whether the vehicle has a high voltage or not, wherein the obtaining module is further configured to obtain a voltage at the dc charging port, and wherein the control module is further configured to:
Under the condition that the current working condition of the vehicle is a parking working condition and the voltage at the direct current charging port is greater than a finger touch prevention safety voltage threshold, controlling the direct current charging port cover to be in a locking state and disconnecting the main contactor;
under the condition that the current working condition of the vehicle is an alternating current charging working condition and the voltage at the direct current charging port is greater than the finger touch prevention safety voltage threshold value, controlling the state of the direct current charging port cover to be a locking state;
under the conditions that the current working condition of the vehicle is a power-on working condition, the voltage at the direct current charging port is greater than the finger-touch prevention safety voltage threshold value and the state of the direct current charging port cover is an unlocking state, if the vehicle speed is greater than a preset vehicle speed threshold value, only a prompt that the direct current charging port cover is in the unlocking state is output to a vehicle user;
and under the conditions that the current working condition of the vehicle is a power-on working condition, the voltage at the direct current charging port is greater than the finger touch prevention safety voltage threshold value and the state of the direct current charging port cover is an unlocking state, if the vehicle speed is less than the preset vehicle speed threshold value, the main contactor is controlled to be disconnected.
13. A dc charging port electric shock protection system, comprising:
A dc charging port shock protection device according to any one of claims 7 to 12;
and the detection module is used for detecting the voltage at the direct-current charging port and sending the detected voltage to the direct-current charging port electric shock protection device.
14. The system of claim 13, further comprising a battery pack, wherein the battery pack comprises a pre-charging contactor, a pre-charging resistor, a main contactor, a negative switch, and a battery module, wherein the pre-charging contactor is connected in series with the pre-charging resistor and then connected in parallel with the main contactor, and the main contactor, the battery module, the negative switch, and the dc charging port form a series circuit.
15. The system of claim 14, wherein the negative switch is one of a contactor, a semiconductor switch.
16. A vehicle comprising a dc charging port shock protection device according to any one of claims 7 to 12 or a dc charging port shock protection system according to any one of claims 13 to 15.
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| CN115207994A (en) * | 2021-04-12 | 2022-10-18 | 北汽福田汽车股份有限公司 | Safety fault identification method and device, storage medium and battery management system |
| CN115723621A (en) * | 2021-08-31 | 2023-03-03 | 比亚迪股份有限公司 | Vehicle controller, vehicle control method and vehicle |
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