CN115091957A - Device and method for diagnosing contact state of high-voltage upper and lower electric contactors and vehicle - Google Patents
Device and method for diagnosing contact state of high-voltage upper and lower electric contactors and vehicle Download PDFInfo
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- CN115091957A CN115091957A CN202210606372.3A CN202210606372A CN115091957A CN 115091957 A CN115091957 A CN 115091957A CN 202210606372 A CN202210606372 A CN 202210606372A CN 115091957 A CN115091957 A CN 115091957A
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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
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
Abstract
The invention discloses a high-voltage upper and lower electric contactor contact state diagnosis device, a high-voltage upper and lower electric contactor contact state diagnosis method and a vehicle, and belongs to the technical field of vehicle control. According to the invention, all voltages are sampled and reference to the reference point of the cathode of the battery, compared with the scheme of two reference points, the complexity of high-low isolation design is reduced, the accuracy of contactor contact state diagnosis is improved, and misdiagnosis caused by load interference is avoided.
Description
Technical Field
The invention discloses a device and a method for diagnosing contact states of a high-voltage upper electric contactor and a high-voltage lower electric contactor and a vehicle, and belongs to the technical field of vehicle control.
Background
The power battery is a core component of the electric automobile, is a power source of the whole automobile, has a voltage of several hundred volts, does not ensure the safety of high-voltage output, and is generally connected to a positive output end and a negative output end of the power battery through a high-voltage contactor to further realize the control of the high-voltage output, such as a high-voltage topology shown in fig. 1. But high voltage contactor can lead to the contactor adhesion under unusual operating mode or improper condition of operation, in case the contactor adhesion takes place can cause the potential safety hazard. Therefore, before and after high-voltage power-on, contactor contact diagnosis is required, and the reliability of diagnosis is ensured.
At present, most of technical schemes for diagnosing the contactor contact of the power battery high-voltage system are associated with a load state and a contactor closing time sequence, at the moment, the contact state judgment of the contactor is coupled with the high-voltage state of the whole vehicle, and under the condition that a contactor control instruction (such as VCU) and an execution instruction (such as BMS) do not have a controller any more, the execution instruction end cannot accurately know the high-voltage state of the whole vehicle and the execution time sequence of the contactor, and the condition of misdiagnosis of the contact state of the contactor can occur.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a device and a method for diagnosing the contact state of a high-voltage upper and lower electric contactor and a vehicle, which solve the technical problems of the influence of the states of a battery high-voltage load such as an X capacitor on the contact voltage sampling and the misdiagnosis of the contact state of a contactor, thereby improving the accuracy of the diagnosis of the contact state of the contactor in the high-voltage upper and lower electric processes and avoiding misdiagnosis events.
The technical scheme of the invention is as follows:
according to a first aspect of the embodiments of the present invention, there is provided a high voltage upper and lower electric contactor contact state diagnosis device, comprising a high voltage power supply, two ends of the high voltage power supply are electrically connected to one end of a fuse, a main negative contactor and a second resistor, respectively, the other end of the fuse is electrically connected to a quick charging positive contactor, a pre-charging contactor, a main positive contactor and a first resistor, respectively, the other ends of the first resistor and the second resistor are connected to each other and to a sampling module, the other end of the quick charging positive contactor is electrically connected to an external load and a voltage dividing module, respectively, the other end of the pre-charging contactor is electrically connected to one end of a pre-charging resistor, the other ends of the main positive contactor and the pre-charging resistor are electrically connected to a voltage dividing module, the other end of the main negative contactor is electrically connected to one end of an external load, a voltage dividing module and a quick charging negative contactor, respectively, the other end of the quick charging negative contactor is electrically connected with one end of the voltage division module and an external load respectively, and the voltage division module is electrically connected with the sampling module.
Preferably, the voltage dividing module comprises a first switch, one end of the first switch is electrically connected with the other ends of the main positive contactor and the pre-charging resistor respectively, the other end of the first switch is electrically connected with one end of a third resistor, the other end of the third resistor is electrically connected with one end of a sampling module and one end of a fourth resistor respectively, the other end of the fourth resistor is electrically connected with one end of a sampling module and one end of a fifth resistor respectively, the other end of the fifth resistor is electrically connected with one end of a sampling module and one end of a sixth resistor respectively, the other end of the sixth resistor is electrically connected with one end of a third switch, the other end of the third switch is electrically connected with an external load, the other end of the main negative contactor and one end of the quick-charging negative contactor respectively, the eighth resistor is electrically connected with one end of a ninth resistor, and the eighth resistor is electrically connected with one end of the sampling module and one end of a seventh resistor respectively, the other end of the seventh resistor is electrically connected with one end of a second switch, the other end of the second switch is electrically connected with the other end of the quick-charging positive contactor, the other end of the ninth resistor is electrically connected with the sampling module and one end of a tenth resistor respectively, the other end of the tenth resistor is electrically connected with one end of a fourth switch, and the other end of the fourth switch is electrically connected with the other end of the quick-charging negative contactor.
Preferably, the sampling module includes a low-voltage power supply, one end of the low-voltage power supply and power isolation module is electrically connected, the other end of the power isolation module is electrically connected with a negative electrode of the high-voltage power supply and a data processing unit respectively, the data processing unit is electrically connected with the voltage division module and the data isolation module respectively, and the data isolation module is electrically connected with the controller.
Preferably, the data processing unit includes a voltage reference source having two ends electrically connected to the first ends of the power isolation module, the first differential sampling unit, the second differential sampling unit, the third differential sampling unit and the fourth differential sampling unit, the second ends of the first differential sampling unit, the second differential sampling unit, the third differential sampling unit and the fourth differential sampling unit are electrically connected to the data isolation module, the data processing unit further includes a single-ended sampling unit having a first end electrically connected to the power isolation module, the second end of the first differential sampling unit is electrically connected to the other end of the third resistor, the second end of the second differential sampling unit is electrically connected to the other end of the sixth resistor, the second end of the third differential sampling unit is electrically connected to the other end of the eighth resistor, and the second end of the fourth differential sampling unit is electrically connected to the other end of the ninth resistor, and the second end and the third end of the single-ended sampling unit are respectively and electrically connected with the other end of the second resistor and the negative electrode of the high-voltage power supply.
Preferably, the other end of the main positive relay is electrically connected with one end of a first external Y capacitor and one end of an external X capacitor, the other end of the main negative relay is electrically connected with one end of a second external Y capacitor and the other end of the external X capacitor, the other end of the first external Y capacitor is electrically connected with the other end of the second external Y capacitor, the first differential sampling unit, the second differential sampling unit, the third differential sampling unit and the fourth differential sampling unit respectively acquire a first sampling point voltage, a second sampling point voltage, a third sampling point voltage and a fourth sampling point voltage, and the single-ended sampling unit acquires a fifth sampling point voltage.
According to a second aspect of the embodiments of the present invention, there is provided a high-voltage upper and lower electric contactor contact state diagnosis method, which is performed by the high-voltage upper and lower electric contactor contact state diagnosis apparatus of the first aspect, the method including:
when a power-on or power-off instruction is received, the first switch, the second switch, the third switch and the fourth switch of the voltage division module are controlled to be disconnected;
acquiring a fifth sampling point voltage through a single-ended sampling unit of the data processing unit, and acquiring an AP terminal voltage through the fifth sampling point voltage;
controlling a first switch and a second switch of the voltage division module to be closed, and controlling a third switch and a fourth switch to be opened;
respectively acquiring a first sampling point voltage and a third sampling point voltage through a first differential sampling unit and a third differential sampling unit of the data processing unit, determining a BP (back propagation) end voltage through the first sampling point voltage, and determining a CP (back propagation) end voltage through the third sampling point voltage;
judging whether the absolute value of the difference value of the AP terminal voltage and the BP terminal voltage is smaller than a first preset value:
if yes, the main positive contactor is in contact adhesion failure;
if not, the main positive contactor has no fault;
judging whether the difference value of the AP terminal voltage and the CP terminal voltage is smaller than a second preset value or not through the absolute value of the difference value:
if yes, the charging positive contactor is in contact adhesion failure;
and if not, the charging positive contactor has no fault.
Preferably, the method further comprises:
controlling a first switch and a second switch of the voltage division module to be switched off, and controlling a third switch and a fourth switch to be switched on;
acquiring a second sampling point voltage through a second differential sampling unit of the data processing unit, and determining a DP end voltage through the second sampling point voltage;
judging whether the voltage is smaller than a fourth preset value through the DP end voltage:
if yes, the main contactor and the negative contactor are in contact adhesion failure;
if not, the main and negative contactors have no fault;
when the main negative contactor and the main positive contactor are both faultless, closing the main negative contactor, acquiring a fourth sampling point voltage through a fourth differential sampling unit of the data processing unit, and determining an EP (end-of-line) end voltage through the fourth sampling point voltage;
judging whether the voltage is smaller than a fourth preset value through the DP end voltage:
if yes, the main contactor and the negative contactor are in contact adhesion failure;
if not, the main negative contactor has no fault;
preferably, the method further comprises the following steps:
when a discharging or charging instruction is received, the first switch, the second switch, the third switch and the fourth switch of the voltage division module are controlled to be closed;
acquiring a fifth sampling point voltage through a single-ended sampling unit of the data processing unit, and acquiring an AP terminal voltage through the fifth sampling point voltage;
when a discharging instruction is received, respectively acquiring a first sampling point voltage and a second sampling point voltage through a first differential sampling unit and a second differential sampling unit of the data processing unit, determining a BM end voltage through the first sampling point voltage, and determining a DM end voltage through the second sampling point voltage;
determining a battery load terminal voltage through the BM terminal voltage and the DM terminal voltage;
judging whether the difference value between the AP terminal voltage and the battery load terminal voltage is smaller than a fifth preset value or not according to the absolute value of the difference value:
if yes, at least one of the main positive contactor and the main negative contactor is in contact adhesion fault;
and if not, the main positive contactor and the main negative contactor are both fault-free.
Preferably, the method further comprises the following steps:
when a charging instruction is received, respectively acquiring a third sampling point voltage and a fourth sampling point voltage through a third differential sampling unit and a fourth differential sampling unit of the data processing unit, determining a CM terminal voltage through the third sampling point voltage, and determining an EM terminal voltage through the fourth sampling point voltage;
determining a battery charging load terminal voltage from the CM terminal voltage and the EM terminal voltage;
judging whether the difference value between the AP terminal voltage and the battery load terminal voltage is larger than a fifth preset value or not according to the absolute value of the difference value:
if yes, at least one of the charging positive contactor, the main negative contactor and the charging negative contactor is in contact adhesion failure;
and if not, the charging positive contactor, the main negative contactor and the charging negative contactor are all fault-free.
According to a third aspect of an embodiment of the present invention, there is provided a vehicle characterized by comprising:
the high-voltage upper and lower electric contactor contact state diagnosis device is used for respectively carrying out fault detection on a main positive contactor, a main negative contactor, a pre-charging contactor, a quick-charging positive contactor and a quick-charging negative contactor;
one or more controllers;
a storage device for storing one or more programs,
when the one or more programs are executed by the one or more controllers, the one or more controllers implement the high voltage upper and lower electric contactor contact state diagnosis method according to the second aspect.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a device, a method and a vehicle for diagnosing contact states of a high-voltage upper and lower electric contactor, wherein the complexity of high-low isolation design is reduced by sampling all voltages and referring to a reference point of a negative electrode of a battery compared with a scheme of two reference points; providing a voltage reference source, wherein the main positive, main negative, charging positive and charging negative outside voltages refer to the reference source for sampling, the LINK voltage and the DCLINK voltage can be collected at the same time, and the contact state is judged by comparing the front and back voltages of the contact of the contactor, the LINK voltage value and the DCLINK voltage value; each high-voltage sampling loop is controlled by a switch, and the contact voltages of the positive contactor and the negative contactor are sampled in a time-sharing manner, so that the external load state is not related to the sampling loops, the sampling result is not influenced by the external load state, the accuracy of the diagnosis of the contact state of the contactor is improved, and the misdiagnosis caused by the interference of the load is avoided.
Drawings
Fig. 1 is an electrical connection diagram of a high voltage upper and lower electric contactor contact state diagnosis device according to the present invention.
Fig. 2 is an electrical connection diagram of a sampling module in the contact state diagnosis device of the high-voltage upper and lower electric contactors.
Fig. 3 is a flow chart of a method for diagnosing the contact state of the high-voltage upper and lower electric contactors according to the present invention.
Fig. 4 is a flow chart of a method for diagnosing the contact state of the high-voltage upper and lower electric contactors according to the present invention.
Fig. 5 is a block diagram of a vehicle according to the present invention.
Detailed Description
The invention is further illustrated below with reference to the accompanying figures 1-5:
the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
As shown in fig. 1, a first embodiment of the present invention provides a high voltage upper and lower electric contactor contact state diagnosis device based on the prior art, which includes a high voltage power supply, two ends of the high voltage power supply are electrically connected to one end of a fuse, a main negative contactor and a second resistor, the other end of the fuse is electrically connected to a quick charging positive contactor, a pre-charging contactor, a main positive contactor and a first resistor, respectively, the other ends of the first resistor and the second resistor are connected to each other and to a sampling module, the other end of the quick charging positive contactor is electrically connected to an external load and a voltage dividing module, respectively, the other end of the pre-charging contactor is electrically connected to one end of the pre-charging resistor, the other ends of the main positive contactor and the pre-charging resistor are electrically connected to the voltage dividing module, the other end of the main negative contactor is electrically connected to the external load, the voltage dividing module and one end of the quick charging negative contactor, respectively, the other end of the quick charging negative contactor is electrically connected with one end of the voltage division module and an external load respectively, and the voltage division module is electrically connected with the sampling module.
Wherein, the voltage dividing module comprises a first switch, one end of the first switch is respectively electrically connected with the other ends of the main positive contactor and the pre-charging resistor, the other end of the first switch is electrically connected with one end of a third resistor, the other end of the third resistor is respectively electrically connected with one end of a sampling module and one end of a fourth resistor, the other end of the fourth resistor is respectively electrically connected with one ends of the sampling module and a fifth resistor, the other end of the fifth resistor is respectively electrically connected with one ends of the sampling module and a sixth resistor, the other end of the sixth resistor is electrically connected with one end of a third switch, the other end of the third switch is respectively electrically connected with an external load, the other end of a main negative contactor and one end of a quick-charging negative contactor, an eighth resistor and one end of a ninth resistor, the other end of the eighth resistor is respectively electrically connected with one ends of the sampling module and a seventh resistor, and the other end of the seventh resistor is electrically connected with one end of a second switch, the other end of the second switch is electrically connected with the other end of the quick-charging positive contactor, the other end of the ninth resistor is electrically connected with the sampling module and one end of the tenth resistor respectively, the other end of the tenth resistor is electrically connected with one end of the fourth switch, and the other end of the fourth switch is electrically connected with the other end of the quick-charging negative contactor.
As shown in fig. 2, the sampling module includes a low voltage power supply, the low voltage power supply is electrically connected to one end of the power isolation module, the other end of the power isolation module is electrically connected to the negative electrode of the high voltage power supply and the data processing unit, the data processing unit is electrically connected to the voltage division module and the data isolation module, and the data isolation module is electrically connected to the controller. The data processing unit comprises a voltage reference source, two ends of the voltage reference source are respectively electrically connected with the first ends of the power isolation module, the first differential sampling unit, the second differential sampling unit, the third differential sampling unit and the fourth differential sampling unit, the second ends of the first differential sampling unit, the second differential sampling unit, the third differential sampling unit and the fourth differential sampling unit are respectively electrically connected with the data isolation module, the data processing unit further comprises a single-ended sampling unit, the first end of the single-ended sampling unit is electrically connected with the power isolation module, the second end of the first differential sampling unit is electrically connected with the other end of the third resistor, the second end of the second differential sampling unit is electrically connected with the other end of the sixth resistor, the second end of the third differential sampling unit is electrically connected with the other end of the eighth resistor, the second end of the fourth differential sampling unit is electrically connected with the other end of the ninth resistor, and the second end and the third end of the single-ended sampling unit are respectively electrically connected with the other end of the second resistor and the negative electrode of the high-voltage power supply .
In this embodiment, the other end of the main positive relay is electrically connected to one end of the first external Y capacitor and one end of the external X capacitor, the other end of the main negative relay is electrically connected to one end of the second external Y capacitor and the other end of the external X capacitor, the other end of the first external Y capacitor is electrically connected to the other end of the second external Y capacitor, the first differential sampling unit, the second differential sampling unit, the third differential sampling unit and the fourth differential sampling unit respectively obtain a first sampling point voltage, a second sampling point voltage, a third sampling point voltage and a fourth sampling point voltage, and the single-ended sampling unit obtains a fifth sampling point voltage. The controller is used for processing the voltage of the first sampling point, the voltage of the second sampling point, the voltage of the third sampling point, the voltage of the fourth sampling point and the voltage of the fifth sampling point.
A second embodiment of the present invention provides a method for diagnosing contact states of high-voltage upper and lower electric contactors, based on the first embodiment, where the method is performed by the apparatus for diagnosing contact states of high-voltage upper and lower electric contactors according to the first embodiment, and the method includes:
when receiving a power-on or power-off command, as shown in fig. 3, the first switch K of the voltage division module is controlled 1 A second switch K 2 And a third switch K 3 And a fourth switch K 4 Is disconnected;
acquiring a fifth sampling point voltage V through a single-ended sampling unit of a data processing unit 5 Through the fifth sampling point voltage V 5 Get AP terminal voltage V AP ，V AP And judging the validity of the total voltage of the battery:
V AP ＝V 5 *(R 1 +R 2 )/R 2
wherein R is 1 Is a first resistance value, R 2 Is the second resistance value.
First switch K for controlling voltage division module 1 And a second switch K 2 Closed, third switch K 3 And a fourth switch K 4 Disconnecting;
respectively acquiring a first sampling point voltage V through a first differential sampling unit and a third differential sampling unit of a data processing unit 1 And a third sample point voltage V 3 Through the first sampling point voltage V 1 Determining the voltage V at the BP terminal BP Through the third sampling point voltage V 3 Determining the CP terminal voltage V CP ：
V BP ＝V rEf +V 1 *(R 3 +R 4 )/R 4
V CP ＝V rEf +V 3 *(R 7 +R 8 )/R 8
Wherein R is 3 Is the third resistance value, R 4 Is the fourth resistance value, R 7 Is the resistance value of the seventh resistor, R 8 Is the eighth resistance value, V rEf A stable reference voltage is generated for the high-side voltage reference source.
Voltage V across AP AP Terminal voltage V with BP BP And judging whether the absolute value of the difference value is smaller than a first preset value:
if yes, the main positive contactor is in contact adhesion failure;
if not, the main positive contactor has no fault;
voltage V across AP AP And a CP terminal voltage V CP Judging whether the absolute value of the difference value is smaller than a second preset value:
if yes, the charging positive contactor is in contact adhesion failure;
otherwise, the charging positive contactor has no fault.
First switch K for controlling voltage division module 1 And a second switch K 2 Open, third switch K 3 And a fourth switch K 4 Closing;
acquiring a second sampling point voltage V through a second differential sampling unit of the data processing unit 2 Through the second sampling point voltage V 2 Determining DP terminal voltage V DP ：
V DP ＝V rEf +V 2 *(R 5 +R 6 )/R 5
Wherein: r 5 Is the fifth resistance value, R 6 Is the sixth resistance value.
Voltage V across DP DP Judging whether the value is smaller than a third preset value:
if yes, the main contactor and the negative contactor are in contact adhesion failure;
if not, the main negative contactor has no fault;
when the main negative contactor and the main positive contactor are both faultless, the main negative contactor is closed, and a fourth sampling point voltage V is obtained through a fourth differential sampling unit of the data processing unit 4 Through the fourth sampling point voltage V 2 Determining EP terminal voltage V EP ：
V EP ＝V rEf +V 4 *(R 9 +R 10 )/R 9
Wherein: r 9 Is the resistance value of the ninth resistor, R 10 Is the tenth resistance value.
Voltage V across DP EP Judging whether the value is smaller than a fourth preset value:
if yes, the main and negative contactors are in contact adhesion failure;
if not, the main negative contactor has no fault;
and disconnecting the main negative electrode, and completing the diagnosis of the contactor contact.
After the high voltage is electrified, the vehicle mainly comprises two modes of discharging and fast charging, as shown in fig. 4, a main positive contactor and a main negative contactor are closed in the discharging mode, at the moment, only the open circuit states of the main positive contactor and the main negative contactor need to be diagnosed, a charging positive contactor, a charging negative contactor and a charging negative contactor need to be closed in the fast charging mode, at the moment, only the open circuit state of a contactor contact needs to be diagnosed, and the method comprises the following steps:
when a discharging or charging instruction is received, a first switch K of the voltage division module is controlled 1 A second switch K 2 And a third switch K 3 And a fourth switch K 4 Closing of (1);
acquiring a fifth sampling point voltage V through a single-ended sampling unit of a data processing unit 5 Through the fifth sampling point voltage V 5 Get AP terminal voltage V AP ：
V AP ＝V 5 *(R 1 +R 2 )/R 2 。
When a discharge instruction is received, a first sampling point voltage V is respectively obtained through a first differential sampling unit and a second differential sampling unit of the data processing unit 1 And a second sampling point voltage V 2 Through the first sampling point voltage V 1 Determining BM terminal voltage V BM Through the second sampling point voltage V 2 Determining DM terminal voltage V DM ：
V BM ＝V 1 *(R 3 +R 4 )/R 4
V DM ＝V 2 *(R 5 +R 6 )/R 5
Terminal voltage V across BM BM And DM terminal voltage V DM Determining a battery load terminal voltage V link ：
V link ＝V BM -V DM
Voltage V across AP AP Terminal voltage V to battery load link Judging whether the absolute value of the difference value is smaller than a fifth preset value:
if yes, at least one of the main positive contactor and the main negative contactor is in contact adhesion failure;
and if not, the main positive contactor and the main negative contactor are both fault-free.
When a charging instruction is received, a third sampling point voltage V is respectively obtained through a third differential sampling unit and a fourth differential sampling unit of the data processing unit 3 And a fourth sampling point voltage V 4 Through the third sampling point voltage V 3 Determining CM terminal voltage V CM Through the fourth sampling point voltage V 4 Determining EM terminal voltage V EM
V CM ＝V 3 *(R 7 +R 8 )/R 8
V EM ＝V 4 *(R 9 +R 10 )/R 9
Determination of battery charging load terminal voltage V by CM terminal voltage and EM terminal voltage dclink ：
V dclink ＝V CM -V EM
Judging whether the difference value between the AP terminal voltage and the battery load terminal voltage is greater than a fifth preset value or not through an absolute value:
if yes, at least one of the charging positive contactor, the main negative contactor and the charging negative contactor is in contact adhesion failure;
if not, the charging positive contactor, the main negative contactor and the charging negative contactor are all fault-free;
a third embodiment of the present invention provides a schematic structural view of a vehicle on the basis of the first embodiment, as shown in fig. 5, the vehicle includes a controller 50, a memory 51, an input device 52, an output device 53, and a high-voltage upper and lower electric contactor contact state diagnosing device 54; the number of controllers 50 in the vehicle may be one or more, and one controller 50 is illustrated in fig. 5; the controller 50, the memory 51, the input device 52, the output device 53, and the high-voltage upper and lower electric contactor contact state diagnosis device 54 in the vehicle may be connected by a bus or other means, and the connection by the bus is exemplified in fig. 5.
A contactor fault detection device 55 for performing fault detection on the main positive contactor, the main negative contactor, the pre-charging contactor, the quick-charging positive contactor and the quick-charging negative contactor; the memory 51 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the contactor failure detection method in the embodiment of the present invention. The controller 50 executes various functional applications and data processing of the vehicle, that is, implements the contactor failure detection method described above, by executing software programs, instructions, and modules stored in the memory 51.
The memory 51 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 51 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 51 may further include memory remotely located from the controller 50, which may be connected to the vehicle over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 52 may be used to receive input numeric or character information and generate key signal inputs relating to user settings and function control of the vehicle. The output device 53 may include a display device such as a display screen.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Although the embodiments of the present invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments. It can be applied in all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (10)
1. A high-voltage upper and lower electric contactor contact state diagnosis device is characterized by comprising a high-voltage power supply, wherein two ends of the high-voltage power supply are respectively and electrically connected with one ends of a fuse, a main negative contactor and a second resistor, the other end of the fuse is respectively and electrically connected with a quick-charging positive contactor, a pre-charging contactor, a main positive contactor and a first resistor, the other ends of the first resistor and the second resistor are mutually connected and electrically connected with a sampling module, the other end of the quick-charging positive contactor is respectively and electrically connected with an external load and a voltage division module, the other end of the pre-charging contactor is electrically connected with one end of the pre-charging resistor, the other ends of the main positive contactor and the pre-charging resistor are respectively and electrically connected with the voltage division module, the other end of the main negative contactor is respectively and electrically connected with one end of an external load, the voltage division module and one end of the quick-charging negative contactor, the other end of the quick-charging negative contactor is respectively and electrically connected with one end of the voltage division module and the external load, the voltage division module is electrically connected with the sampling module.
2. The apparatus as claimed in claim 1, wherein the voltage dividing module includes a first switch, one end of the first switch is electrically connected to the other ends of the main positive contactor and the pre-charging resistor, respectively, the other end of the first switch is electrically connected to one end of a third resistor, the other end of the third resistor is electrically connected to one ends of a sampling module and a fourth resistor, the other end of the fourth resistor is electrically connected to one ends of a sampling module and a fifth resistor, the other end of the fifth resistor is electrically connected to one ends of a sampling module and a sixth resistor, respectively, the other end of the sixth resistor is electrically connected to one end of a third switch, the other end of the third switch is electrically connected to the external load, the other end of the main negative contactor, and one end of the fast charging negative contactor, respectively, the eighth resistor and one end of the ninth resistor, the eighth resistor other end respectively with sampling module and seventh resistor one end electric connection, the seventh resistor other end and second switch one end electric connection, the second switch other end with fill positive contactor other end electric connection soon, the ninth resistor other end respectively with sampling module and tenth resistor one end electric connection, the tenth resistor other end and fourth switch one end electric connection, the fourth switch other end and fill negative contactor other end electric connection soon.
3. The apparatus as claimed in claim 2, wherein the sampling module comprises a low voltage power source, the low voltage power source is electrically connected to one end of a power isolation module, the other end of the power isolation module is electrically connected to the negative electrode of the high voltage power source and the data processing unit, the data processing unit is electrically connected to the voltage dividing module and the data isolation module, and the data isolation module is electrically connected to the controller.
4. The apparatus as claimed in claim 3, wherein the data processing unit includes a voltage reference source having two ends electrically connected to the first ends of the power isolation module, the first differential sampling unit, the second differential sampling unit, the third differential sampling unit and the fourth differential sampling unit, respectively, the third ends of the first differential sampling unit, the second differential sampling unit, the third differential sampling unit and the fourth differential sampling unit are electrically connected to the data isolation module, respectively, the data processing unit further includes a single-ended sampling unit having a first end electrically connected to the power isolation module, the second end of the first differential sampling unit is electrically connected to the other end of the third resistor, the second end of the second differential sampling unit is electrically connected to the other end of the sixth resistor, and the second end of the third differential sampling unit is electrically connected to the other end of the eighth resistor, the second end and the third end of the single-ended sampling unit are respectively electrically connected with the other end of the second resistor and the negative electrode of the high-voltage power supply.
5. The device for diagnosing the contact state of the high-voltage upper and lower electric contactors of claim 4, wherein the other end of the main positive relay is electrically connected to one end of a first external Y capacitor and one end of an external X capacitor, the other end of the main negative relay is electrically connected to one end of a second external Y capacitor and the other end of the external X capacitor, the other end of the first external Y capacitor is electrically connected to the other end of the second external Y capacitor, the first differential sampling unit, the second differential sampling unit, the third differential sampling unit and the fourth differential sampling unit respectively obtain a voltage at a first sampling point, a voltage at a second sampling point, a voltage at a third sampling point and a voltage at a fourth sampling point, and the single-ended sampling unit obtains a voltage at a fifth sampling point.
6. A high voltage upper and lower electric contactor contact state diagnosis method performed by a high voltage upper and lower electric contactor contact state diagnosis apparatus of any one of claims 1 to 5, the method comprising:
when a power-on or power-off instruction is received, the first switch, the second switch, the third switch and the fourth switch of the voltage division module are controlled to be disconnected;
acquiring a fifth sampling point voltage through a single-ended sampling unit of the data processing unit, and acquiring an AP terminal voltage through the fifth sampling point voltage;
controlling a first switch and a second switch of the voltage division module to be closed, and controlling a third switch and a fourth switch to be opened;
respectively acquiring a first sampling point voltage and a third sampling point voltage through a first differential sampling unit and a third differential sampling unit of the data processing unit, determining a BP (back propagation) end voltage through the first sampling point voltage, and determining a CP (back propagation) end voltage through the third sampling point voltage;
judging whether the difference value between the AP terminal voltage and the BP terminal voltage is smaller than a first preset value or not according to the absolute value of the difference value:
if yes, the main positive contactor is in contact adhesion failure;
if not, the main positive contactor has no fault;
judging whether the absolute value of the difference value between the AP terminal voltage and the CP terminal voltage is smaller than a second preset value:
if yes, the charging positive contactor is in contact adhesion failure;
and if not, the charging positive contactor has no fault.
7. The method for diagnosing the contact state of the upper and lower high-voltage electric contactors of claim 6, further comprising:
controlling a first switch and a second switch of the voltage division module to be switched off, and controlling a third switch and a fourth switch to be switched on;
acquiring a second sampling point voltage through a second differential sampling unit of the data processing unit, and determining a DP end voltage through the second sampling point voltage;
judging whether the voltage is smaller than a fourth preset value through the DP end voltage:
if yes, the main contactor and the negative contactor are in contact adhesion failure;
if not, the main and negative contactors have no fault;
when the main negative contactor and the main positive contactor are both free of faults, closing the main negative contactor, obtaining a fourth sampling point voltage through a fourth differential sampling unit of the data processing unit, and determining an EP terminal voltage through the fourth sampling point voltage;
judging whether the voltage is smaller than a fourth preset value through the DP end voltage:
if yes, the main contactor and the negative contactor are in contact adhesion failure;
and if not, the main negative contactor has no fault.
8. The method as claimed in claim 7, further comprising:
when a discharging or charging instruction is received, the first switch, the second switch, the third switch and the fourth switch of the voltage division module are controlled to be closed;
acquiring a fifth sampling point voltage through a single-ended sampling unit of the data processing unit, and acquiring an AP terminal voltage through the fifth sampling point voltage;
when a discharging instruction is received, respectively acquiring a first sampling point voltage and a second sampling point voltage through a first differential sampling unit and a second differential sampling unit of the data processing unit, determining a BM end voltage through the first sampling point voltage, and determining a DM end voltage through the second sampling point voltage;
determining a battery load terminal voltage through the BM terminal voltage and the DM terminal voltage;
judging whether the difference value between the AP terminal voltage and the battery load terminal voltage is smaller than a fifth preset value or not according to the absolute value of the difference value:
if yes, at least one of the main positive contactor and the main negative contactor is in contact adhesion failure;
and if not, the main positive contactor and the main negative contactor are both fault-free.
9. The method as claimed in claim 8, further comprising:
when a charging instruction is received, respectively acquiring a third sampling point voltage and a fourth sampling point voltage through a third differential sampling unit and a fourth differential sampling unit of the data processing unit, determining a CM terminal voltage through the third sampling point voltage, and determining an EM terminal voltage through the fourth sampling point voltage;
determining a battery charging load terminal voltage from the CM terminal voltage and the EM terminal voltage;
judging whether the difference value between the AP terminal voltage and the battery load terminal voltage is larger than a fifth preset value or not according to the absolute value of the difference value:
if yes, at least one of the charging positive contactor, the main negative contactor and the charging negative contactor is in contact adhesion failure;
and if not, the charging positive contactor, the main negative contactor and the charging negative contactor are all fault-free.
10. A vehicle, characterized in that the vehicle comprises:
the high-voltage upper and lower electric contactor contact state diagnostic device as claimed in any one of claims 1 to 5, for performing fault detection on a main positive contactor, a main negative contactor, a pre-charging contactor, a quick-charging positive contactor and a quick-charging negative contactor, respectively;
one or more controllers;
a storage device for storing one or more programs,
when the one or more programs are executed by the one or more controllers, the one or more controllers are caused to implement the high voltage upper and lower electrical contactor contact status diagnostic method of any one of claims 3-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210606372.3A CN115091957A (en) | 2022-05-31 | 2022-05-31 | Device and method for diagnosing contact state of high-voltage upper and lower electric contactors and vehicle |
| PCT/CN2023/093426 WO2023231734A1 (en) | 2022-05-31 | 2023-05-11 | High-voltage power-on and power-off contactor contact state diagnosis device and method, and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210606372.3A CN115091957A (en) | 2022-05-31 | 2022-05-31 | Device and method for diagnosing contact state of high-voltage upper and lower electric contactors and vehicle |
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| Publication Number | Publication Date |
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| CN115091957A true CN115091957A (en) | 2022-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210606372.3A Pending CN115091957A (en) | 2022-05-31 | 2022-05-31 | Device and method for diagnosing contact state of high-voltage upper and lower electric contactors and vehicle |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115091957A (en) |
| WO (1) | WO2023231734A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115629308A (en) * | 2022-11-17 | 2023-01-20 | 北京睿行智控科技有限公司 | Diagnosis circuit, diagnosis method and system for working state of power battery pack contactor |
| WO2023231734A1 (en) * | 2022-05-31 | 2023-12-07 | 中国第一汽车股份有限公司 | High-voltage power-on and power-off contactor contact state diagnosis device and method, and vehicle |
| WO2024041059A1 (en) * | 2022-08-25 | 2024-02-29 | 深圳威迈斯新能源股份有限公司 | Adhesion detection and voltage difference measurement circuit for relay |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102052956B1 (en) * | 2013-05-21 | 2019-12-09 | 엘지이노텍 주식회사 | Relay checking device of battery pack and Battery control system |
| CN106338688B (en) * | 2016-08-24 | 2019-11-26 | 深圳市科列技术股份有限公司 | Vehicle mounted battery management system main relay adhesion detection circuit and its detection method |
| CN109188266A (en) * | 2018-10-11 | 2019-01-11 | 东莞塔菲尔新能源科技有限公司 | A kind of detection circuit and its detection method that high voltage negative relay is adhered |
| CN112858894A (en) * | 2019-11-28 | 2021-05-28 | 北京宝沃汽车股份有限公司 | Detection method and detection device for working state of contactor, storage medium and vehicle |
| CN115091957A (en) * | 2022-05-31 | 2022-09-23 | 中国第一汽车股份有限公司 | Device and method for diagnosing contact state of high-voltage upper and lower electric contactors and vehicle |
-
2022
- 2022-05-31 CN CN202210606372.3A patent/CN115091957A/en active Pending
-
2023
- 2023-05-11 WO PCT/CN2023/093426 patent/WO2023231734A1/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023231734A1 (en) * | 2022-05-31 | 2023-12-07 | 中国第一汽车股份有限公司 | High-voltage power-on and power-off contactor contact state diagnosis device and method, and vehicle |
| WO2024041059A1 (en) * | 2022-08-25 | 2024-02-29 | 深圳威迈斯新能源股份有限公司 | Adhesion detection and voltage difference measurement circuit for relay |
| CN115629308A (en) * | 2022-11-17 | 2023-01-20 | 北京睿行智控科技有限公司 | Diagnosis circuit, diagnosis method and system for working state of power battery pack contactor |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023231734A1 (en) | 2023-12-07 |
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