CN113238169A - Land loss detection method, readable storage medium and vehicle - Google Patents
Land loss detection method, readable storage medium and vehicle Download PDFInfo
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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Abstract
The invention provides a land loss detection method, a readable storage medium and a vehicle. The earth loss detection method simultaneously judges whether the difference value of the sum of the inflow currents of the first terminal group and the sum of the outflow currents of the second terminal group exceeds a first preset range and judges whether the difference value of the first voltage and the second voltage exceeds a second preset range. The configuration covers all working conditions which may occur when the DC-DC converter loses the ground, comprehensively and accurately detects the ground loss condition of the DC-DC converter, and solves the problem that the ground loss detection method of the DC-DC converter is lacked in the prior art.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a land loss detection method, a readable storage medium and a vehicle.
Background
In 48V dc-dc converter (48V DCDC) products, the 48V DCDC ground terminal is connected to the product housing and to the vehicle body ground. When the connection between the 48V DCDC grounding terminal and the vehicle body ground is disconnected or the contact is poor (the ground is lost), the 48V DCDC can not output power normally according to the expected design function or can not output stable voltage, and the 12V storage battery of the whole vehicle is in power shortage in serious conditions, so that the whole vehicle can not work normally.
The same problem exists for other types of dc-dc converters mounted on vehicles.
In order to avoid finding the abnormal phenomenon in time when the dc-dc converter loses the ground, so that the whole vehicle can give a prompt in time and take corresponding measures to avoid further influence of the abnormality on the running of the whole vehicle, a method is needed to comprehensively and accurately detect the ground loss condition of the dc-dc converter.
In the prior art, a method for detecting the grounding condition of the DC-DC converter is lacked.
Disclosure of Invention
The invention aims to provide a ground fault detection method, a readable storage medium and a vehicle, so as to solve the problem that the ground fault detection method of a direct current-direct current converter is lacked in the prior art.
In order to solve the above technical problem, according to a first aspect of the present invention, there is provided a ground fault detection method for detecting whether a ground line of a dc-dc converter is lost, the ground fault detection method including: counting the sum of the current flowing out of the first terminal group; counting the sum of the inflow currents of the second terminal group; judging whether the difference value of the sum of the outflow currents and the sum of the inflow currents exceeds a first preset range or not to obtain a first judgment result; judging whether the difference value of the first voltage and the second voltage exceeds a second preset range or not to obtain a second judgment result; the first voltage is a voltage difference between an output side output positive terminal and a grounding terminal; the second voltage is the voltage difference between the positive terminal of the output side power supply and the ground of the vehicle body; when at least one of the first judgment result or the second judgment result is yes, determining that the grounding wire of the DC-DC converter is lost; otherwise, determining that the DC-DC converter ground wire is not lost.
Optionally, the earth loss detection method is cyclically run in real time.
Optionally, after determining that the ground line of the dc-dc converter is lost, the ground loss detection method further includes: outputting a preset signal to perform at least one of alarming, prompting, and starting a safety protection mechanism.
Optionally, the first terminal group includes the output-side output positive terminal and an output-side power supply negative terminal, and the second terminal group includes the input-side input positive terminal, the output-side power supply positive terminal, and the ground terminal.
Optionally, the first terminal group includes only the output side output positive terminal, and the second terminal group includes only the input side input positive terminal and the ground terminal.
Optionally, the input side rated voltage of the dc-dc converter is higher than the output side rated voltage of the dc-dc converter.
Optionally, the input side rated voltage of the dc-dc converter is 48V, and the output side rated voltage of the dc-dc converter is 12V.
In order to solve the above technical problem, according to a second aspect of the present invention, there is provided a readable storage medium having stored thereon a program which, when executed, performs the above-described land loss detection method.
In order to solve the above technical problem, according to a third aspect of the present invention, there is provided a vehicle including a dc-dc converter and a controller, the controller being configured to detect whether a dc-dc converter ground line is lost, the controller being specifically configured to: counting the sum of the current flowing out of the first terminal group; counting the sum of the inflow currents of the second terminal group; judging whether the difference value of the sum of the outflow currents and the sum of the inflow currents exceeds a first preset range or not to obtain a first judgment result; judging whether the difference value of the first voltage and the second voltage exceeds a second preset range or not to obtain a second judgment result; the first voltage is a voltage difference between an output side output positive terminal and a grounding terminal; the second voltage is the voltage difference between the positive terminal of the output side power supply and the ground of the vehicle body. When at least one of the first judgment result or the second judgment result is yes, determining that the grounding wire of the DC-DC converter is lost; otherwise, determining that the DC-DC converter ground wire is not lost.
Optionally, the vehicle further includes a first battery and a second battery, and the dc-dc converter includes the output side output positive terminal, the output side power supply negative terminal, the input side input positive terminal, the output side power supply positive terminal, and the ground terminal; wherein a rated voltage of the first battery is higher than a rated voltage of the second battery; the output side output positive terminal is connected with the positive electrode of the second battery and a load; the output side power supply negative terminal is connected with a vehicle body ground of the vehicle; the input side input positive terminal is connected with the positive electrode of the first battery; the output side power supply positive terminal is connected with the positive electrode of the second battery; the grounding terminal is connected with the body ground of the vehicle; the negative electrode of the first battery is connected with the body ground of the vehicle; the negative electrode of the second battery is connected with the body ground of the vehicle.
Compared with the prior art, the ground fault detection method, the readable storage medium and the vehicle provided by the invention simultaneously judge whether the difference value between the sum of the inflow currents of the first terminal group and the sum of the outflow currents of the second terminal group exceeds a first preset range and judge whether the difference value between the first voltage and the second voltage exceeds a second preset range. The configuration covers all working conditions which may occur when the DC-DC converter loses the ground, comprehensively and accurately detects the ground loss condition of the DC-DC converter, and solves the problem that the ground loss detection method of the DC-DC converter is lacked in the prior art.
Drawings
It will be appreciated by those skilled in the art that the drawings are provided for a better understanding of the invention and do not constitute any limitation to the scope of the invention. Wherein:
fig. 1 is a schematic wiring diagram of a dc-dc converter to which a method for detecting a ground fault according to an embodiment of the present invention is applied;
FIG. 2 is a flow chart illustrating a method for detecting a lost place according to an embodiment of the present invention;
FIG. 3a is a schematic diagram of a first earth-loss model of an earth-loss detection method according to an embodiment of the invention;
fig. 3b is a schematic diagram of a second earth-loss model of the earth-loss detection method according to the embodiment of the invention.
In the drawings:
1-a housing; 2-internal circuitry; 3-input side input positive terminal; 4-output side power supply negative terminal; 5-output side power supply positive terminal; 6-output side output positive terminal; 7-a ground terminal; 8-parasitic impedance; 9-a first battery; 10-second battery.
Detailed Description
To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.
As used in this application, the singular forms "a", "an" and "the" include plural referents, the term "or" is generally employed in a sense including "and/or," the terms "a" and "an" are generally employed in a sense including "at least one," the terms "at least two" are generally employed in a sense including "two or more," and the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, features defined as "first", "second" and "third" may explicitly or implicitly include one or at least two of the features, "one end" and "the other end" and "proximal end" and "distal end" generally refer to the corresponding two parts, which include not only the end points, but also the terms "mounted", "connected" and "connected" should be understood broadly, e.g., as a fixed connection, as a detachable connection, or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Furthermore, as used in the present invention, the disposition of an element with another element generally only means that there is a connection, coupling, fit or driving relationship between the two elements, and the connection, coupling, fit or driving relationship between the two elements may be direct or indirect through intermediate elements, and cannot be understood as indicating or implying any spatial positional relationship between the two elements, i.e., an element may be in any orientation inside, outside, above, below or to one side of another element, unless the content clearly indicates otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The core idea of the invention is to provide a ground fault detection method, a readable storage medium and a vehicle, so as to solve the problem that the ground fault detection method of a dc-dc converter is lacked in the prior art.
The following description refers to the accompanying drawings.
Referring to fig. 1 to fig. 3b, fig. 1 is a schematic diagram illustrating a connection of a dc-dc converter applied in a method for detecting a ground fault according to an embodiment of the present invention; FIG. 2 is a flow chart illustrating a method for detecting a lost place according to an embodiment of the present invention; FIG. 3a is a schematic diagram of a first earth-loss model of an earth-loss detection method according to an embodiment of the invention;
fig. 3b is a schematic diagram of a second earth-loss model of the earth-loss detection method according to the embodiment of the invention.
Referring to fig. 1, the dc-dc converter includes an input side input positive terminal 3, an output side power supply negative terminal 4, an output side power supply positive terminal 5, an output side output positive terminal 6, a ground terminal 7, a housing 1, and an internal circuit 2. The ground terminal 7 is used to connect the housing 1 and a vehicle body ground.
Referring to fig. 2, the method for detecting a dead zone includes:
s10, counting the sum of the current flowing out of the first terminal group;
s20 counting the sum of the inflow currents of the second terminal group;
s30, judging whether the difference value of the sum of the outflow currents and the sum of the inflow currents exceeds a first preset range or not to obtain a first judgment result;
s40, judging whether the difference value between the voltage of the output side power supply positive terminal and the voltage of the output side output positive terminal exceeds a second preset range or not to obtain a second judgment result;
s50 determining that the dc-dc converter ground line is lost when at least one of the first determination result or the second determination result is yes; otherwise, determining that the DC-DC converter ground wire is not lost.
It is to be understood that step S30 is used to detect whether the dc-dc converter is currently in the state of the first earth fault model. Referring to fig. 3a, the first grounding model is that after the grounding terminal 7 is disconnected from the vehicle body ground, a parasitic impedance 8 exists between the housing 1 of the dc-dc converter and the vehicle body ground.
Under normal conditions, according to kirchhoff's current law, the sum of the currents into the dc-dc converter and the sum of the currents out of the dc-dc converter should be equal, i.e.:
I_T40+I_T30e+I_T31p＝I_T30p+I_T31e。
wherein I _ T40 is a current flowing into the dc-dc converter through the input side input positive terminal 3, I _ T30e is a current flowing into the dc-dc converter through the output side power supply positive terminal 5, and I _ T31p is a current flowing into the dc-dc converter through the ground terminal 7; i _ T30p is the current that flows out of the dc-dc converter through the output side output positive terminal 6; i _ T31e is the current that flows out of the dc-dc converter through the output side supply negative terminal 4.
In the operating condition shown in fig. 3a, when a ground loss occurs, the ground line impedance becomes large, the current I _ T31p flowing through the ground terminal 7 decreases, and a part of the current flows into the dc-dc converter through the parasitic impedance 8, according to kirchhoff's current law:
(I _ T30p + I _ T31e) - (I _ T40+ I _ T30e + I _ T31p + I _ Rpar) ═ 0, where I _ Rpar is the current flowing into the dc-dc converter through the parasitic impedance 8.
That is to say:
(I_T30p+I_T31e)－(I_T40+I_T30e+I_T31p)>I_Cal。
wherein I _ Cal is a calibration quantity and can be calculated by the current I _ Rpar (for example, I _ Rpar is used directly or calculated after safety conversion), and corresponds to the first preset range.
It should be understood that, in this embodiment, it is essentially determined whether (I _ T30p + I _ T31e) - (I _ T40+ I _ T30e + I _ T31p) > I _ Cal is true, and an equivalent conversion based on the above idea is performed, for example, it is determined whether 2(I _ T30p + I _ T31e) -2 (I _ T40+ I _ T30e + I _ T31p) >2I _ Cal is true, it is determined whether (I _ T40+ I _ T30e + I _ T31p) - (I _ T30p + I _ T31e) < -I _ Cal is true, or the determination is performed by a circuit manner, and it should be determined whether (I _ T30p + I _ T31e) - (I _ T40+ I _ T30e + I _ T31) > I _ Cal 31p) > I _ Cal is true.
As can be seen, in one embodiment, the first terminal set includes the output side output positive terminal 6 and the output side power supply negative terminal 4, and the second terminal set includes the input side input positive terminal 3, the output side power supply positive terminal 5, and the ground terminal 7.
Since I _ T30e is equal to I _ T31e in the dc-dc converter, the determination process can be simplified to determine whether the following equation holds:
I_T30p－(I_T40+I_T31p)>I_Cal。
for the specific implementation of the determination process of the above formula, it can be understood by referring to the idea of determining whether (I _ T30p + I _ T31e) - (I _ T40+ I _ T30e + I _ T31p) > I _ Cal is true, that is, for equivalent mathematical transformation of I _ T30 p- (I _ T40+ I _ T31p) > I _ Cal or determination by way of a circuit, it should be regarded as determining whether I _ T30 p- (I _ T40+ I _ T31p) > I _ Cal is true.
That is, in a preferred embodiment, the first terminal group includes only the output side output positive terminal 6, and the second terminal group includes only the input side input positive terminal 3 and the ground terminal 7.
It is to be understood that step S40 is used to detect whether the dc-dc converter is currently in the state of the second earth fault model. Referring to fig. 3b, the second grounding model means that after the grounding terminal 7 is disconnected from the vehicle body ground, the parasitic impedance 8 does not exist between the housing 1 of the dc-dc converter and the vehicle body ground.
The output voltage U _ T30p of the dc-dc converter is normally close to the voltage U _ T30e of the second battery 10. Wherein, U _ T30p can be obtained by measuring the voltage difference between the output side output positive electrode terminal 6 and the grounding terminal 7, and U _ T30e can be obtained by measuring the voltage difference between the output side power supply positive electrode terminal 5 and the vehicle body ground. When the grounding wire is lost and the parasitic impedance 8 does not exist between the shell 1 of the direct current-direct current converter and the ground of the vehicle body, the grounding terminal 7 is in a suspended state, and the ground can not be judged to be lost according to kirchhoff current law. At this time, due to its own control characteristic, the output voltage U _ T30p of the dc-dc converter gradually decreases, while the voltage U _ T30e of the second battery 10 maintains a normal value, that is:
U_T30e－U_T30p>U_Cal。
u _ Cal is a calibration quantity, and can be calibrated according to system parameters and safety requirements. When the U _ T30 e-U _ T30p is larger than a certain threshold value, namely the difference value of the first voltage and the second voltage is large enough, the phenomenon that the ground is lost can be judged. U _ Cal corresponds to the second preset range.
For a specific implementation manner of the determination process of U _ T30 e-U _ T30p > U _ Cal, it can be understood by referring to an idea of determining whether (I _ T30p + I _ T31e) - (I _ T40+ I _ T30e + I _ T31p) > I _ Cal is true, that is, for equivalent mathematical transformation of U _ T30 e-U _ T30p > U _ Cal, or by way of a circuit, it should be considered to determine whether U _ T30 e-U _ T30p > U _ Cal is true.
Based on the above analysis, in order to fully detect the grounding condition of the dc-dc converter, it is necessary to determine whether the dc-dc converter is in the first grounding loss model or the second grounding loss model at the same time, that is, the determination is performed in step S50, and finally the determination result is obtained.
Through the steps, whether the direct current-direct current converter is in the ground loss working condition or not can be comprehensively and accurately judged, and the problem that a ground loss detection method of the direct current-direct current converter is lacked in the prior art is solved.
In this embodiment, the method for detecting a dead zone cyclically operates in real time to ensure that the occurrence of a dead zone condition can be found at the first time, thereby avoiding greater loss.
Preferably, after determining that the dc-dc converter ground line is lost, the ground fault detection method further includes: outputting a preset signal to perform at least one of alarming, prompting, and starting a safety protection mechanism.
In the present embodiment, the input-side rated voltage of the dc-dc converter is higher than the output-side rated voltage of the dc-dc converter. Specifically, the input side rated voltage of the dc-dc converter is 48V, and the output side rated voltage of the dc-dc converter is 12V. It should be understood that the method for detecting earth loss can also be used for a DC-DC converter with other rated voltage values.
The present embodiment also provides a readable storage medium having stored thereon a program that, when executed, performs the above-described land loss detection method.
The embodiment also provides a vehicle, which is characterized by comprising a dc-dc converter and a controller, wherein the controller is configured to detect whether a ground line of the dc-dc converter is lost, and the controller is specifically configured to: counting the sum of the current flowing out of the first terminal group; counting the sum of the inflow currents of the second terminal group; judging whether the difference value of the sum of the outflow currents and the sum of the inflow currents exceeds a first preset range or not to obtain a first judgment result; judging whether the difference value of the first voltage and the second voltage exceeds a second preset range or not to obtain a second judgment result; the first voltage is a voltage difference between the output side output positive terminal 6 and the ground terminal 7; the second voltage is the voltage difference between the positive power supply terminal 5 on the output side and the vehicle body ground; when at least one of the first judgment result or the second judgment result is yes, determining that the grounding wire of the DC-DC converter is lost; otherwise, determining that the DC-DC converter ground wire is not lost.
Further, the vehicle further includes a first battery 9 and a second battery 10, and the dc-dc converter includes the output side output positive terminal 6, the output side power supply negative terminal 4, the input side input positive terminal 3, the output side power supply positive terminal 5, and the ground terminal 7; wherein the rated voltage of the first battery 9 is higher than the rated voltage of the second battery 10; the output side output positive terminal 6 is connected with the positive electrode of the second battery and a load; the output side power supply negative terminal 4 is connected with the vehicle body ground of the vehicle; the input-side input positive terminal 3 is connected to the positive electrode of the first battery 9; the output side power supply positive terminal 5 is connected to the positive electrode of the second battery 10; the ground terminal 7 is connected to a body ground of the vehicle; the negative electrode of the first battery 9 is connected with the vehicle body ground of the vehicle; the negative electrode of the second battery 10 is connected to the body ground of the vehicle.
The connection relationship of the above-described vehicle interior components can also be understood with reference to fig. 1.
Other components and their connection in the vehicle can be reasonably arranged according to actual needs and common knowledge by those skilled in the art, and will not be described in detail here.
Since the readable storage medium and the vehicle adopt the ground fault detection method, the beneficial effect of being capable of comprehensively and accurately detecting the ground fault condition of the DC-DC converter is also obtained.
In summary, in the ground fault detection method, the readable storage medium and the vehicle provided in this embodiment, the ground fault detection method simultaneously determines whether a difference between a sum of currents flowing into the first terminal group and a sum of currents flowing out of the second terminal group exceeds a first preset range and whether a difference between the first voltage and the second voltage exceeds a second preset range. The configuration covers all working conditions which may occur when the DC-DC converter loses the ground, comprehensively and accurately detects the ground loss condition of the DC-DC converter, and solves the problem that the ground loss detection method of the DC-DC converter is lacked in the prior art.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art according to the above disclosure are within the scope of the present invention.
Claims (10)
1. A method for detecting a ground fault, which is used for detecting whether a ground wire of a DC-DC converter is lost, the method comprising the following steps:
counting the sum of the current flowing out of the first terminal group;
counting the sum of the inflow currents of the second terminal group;
judging whether the difference value of the sum of the outflow currents and the sum of the inflow currents exceeds a first preset range or not to obtain a first judgment result;
judging whether the difference value of the first voltage and the second voltage exceeds a second preset range or not to obtain a second judgment result; the first voltage is a voltage difference between an output side output positive terminal and a grounding terminal; the second voltage is the voltage difference between the positive terminal of the output side power supply and the ground of the vehicle body;
when at least one of the first judgment result or the second judgment result is yes, determining that the grounding wire of the DC-DC converter is lost; otherwise, determining that the DC-DC converter ground wire is not lost.
2. The earth fault detection method according to claim 1, characterized in that the earth fault detection method is cyclically run in real time.
3. The method of claim 1 or 2, wherein after determining that the dc-dc converter ground line is lost, the method further comprises:
outputting a preset signal to perform at least one of alarming, prompting, and starting a safety protection mechanism.
4. A method as claimed in claim 1 or 2, wherein the first terminal set comprises the output side output positive terminal and an output side power negative terminal, and the second terminal set comprises an input side input positive terminal, the output side power positive terminal and the ground terminal.
5. The method of claim 1 or 2, wherein the first terminal set includes only the output side output positive terminal and the second terminal set includes only the input side input positive terminal and the ground terminal.
6. A method as claimed in claim 1 or 2, wherein the input side rated voltage of the dc-dc converter is higher than the output side rated voltage of the dc-dc converter.
7. The earth fault detection method of claim 6, wherein an input side rated voltage of the DC-DC converter is 48V and an output side rated voltage of the DC-DC converter is 12V.
8. A readable storage medium having a program stored thereon, which when executed, performs the method of detecting a land fault as claimed in any one of claims 1 to 7.
9. A vehicle comprising a dc-dc converter and a controller, the controller configured to detect whether a dc-dc converter ground line is missing, the controller being specifically configured to:
counting the sum of the current flowing out of the first terminal group;
counting the sum of the inflow currents of the second terminal group;
judging whether the difference value of the sum of the outflow currents and the sum of the inflow currents exceeds a first preset range or not to obtain a first judgment result;
judging whether the difference value of the first voltage and the second voltage exceeds a second preset range or not to obtain a second judgment result; the first voltage is a voltage difference between an output side output positive terminal and a grounding terminal; the second voltage is the voltage difference between the positive terminal of the output side power supply and the ground of the vehicle body;
when at least one of the first judgment result or the second judgment result is yes, determining that the grounding wire of the DC-DC converter is lost; otherwise, determining that the DC-DC converter ground wire is not lost.
10. The vehicle according to claim 9, characterized in that the vehicle further comprises a first battery and a second battery, the dc-dc converter comprising the output side output positive terminal, an output side power supply negative terminal, an input side input positive terminal, the output side power supply positive terminal, and the ground terminal; wherein the content of the first and second substances,
the rated voltage of the first battery is higher than the rated voltage of the second battery;
the output side output positive terminal is connected with the positive electrode of the second battery and a load;
the output side power supply negative terminal is connected with a vehicle body ground of the vehicle;
the input side input positive terminal is connected with the positive electrode of the first battery;
the output side power supply positive terminal is connected with the positive electrode of the second battery;
the grounding terminal is connected with the body ground of the vehicle;
the negative electrode of the first battery is connected with the body ground of the vehicle;
the negative electrode of the second battery is connected with the body ground of the vehicle.
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| CN202110281740.7A CN113238169B (en) | 2021-03-16 | 2021-03-16 | Method for detecting missing ground, readable storage medium, and vehicle |
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| CN202110281740.7A CN113238169B (en) | 2021-03-16 | 2021-03-16 | Method for detecting missing ground, readable storage medium, and vehicle |
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