CN110857964A - High-voltage interlocking loop, method for detecting electrical continuity fault by using high-voltage interlocking loop, computer storage medium and electric vehicle - Google Patents
High-voltage interlocking loop, method for detecting electrical continuity fault by using high-voltage interlocking loop, computer storage medium and electric vehicle Download PDFInfo
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- CN110857964A CN110857964A CN201810895646.9A CN201810895646A CN110857964A CN 110857964 A CN110857964 A CN 110857964A CN 201810895646 A CN201810895646 A CN 201810895646A CN 110857964 A CN110857964 A CN 110857964A
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- 238000004590 computer program Methods 0.000 description 3
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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
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/10—Measuring sum, difference or ratio
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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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention provides a high-voltage interlocking loop, a method for detecting an electrical continuity fault by using the high-voltage interlocking loop, a computer storage medium and an electric automobile. The high-voltage interlock circuit includes a plurality of high-voltage components, a connector corresponding to each of the plurality of high-voltage components, and an interlock line for connecting the plurality of high-voltage components and the connector in series to form the high-voltage interlock circuit, wherein the interlock line connects a pull-up resistor to a first potential at a first end thereof, the interlock line connects a pull-down resistor to a second potential at a second end thereof, wherein the first potential is higher than the second potential, and a resistor is connected in series in each of the plurality of high-voltage components through which the interlock line passes, so that an electrical continuity fault of the high-voltage interlock circuit can be determined by detecting a voltage ratio between the second end and the first end.
Description
Technical Field
The present invention relates to the field of electric vehicles, and in particular, to a high voltage interlock circuit and a method for detecting an electrical continuity fault using the high voltage interlock circuit.
Background
The electric energy required by the traditional fuel-powered automobile is totally from a 12V storage battery. The important difference between the electric automobile and the traditional automobile is that the electric automobile generally has two sets of battery systems, wherein a high-voltage battery system is used for driving, and a 12V low-voltage battery system is used for supplying power to a load and cold starting of an engine. The voltage of the high-voltage battery system is generally more than 300V and far exceeds the safe voltage range, and the working current of the high-voltage circuit is generally dozens or hundreds of amperes. Therefore, for the high voltage safety, the high voltage circuit of the electric vehicle must be monitored, and the high voltage interlock is an important means for monitoring the safety of the electric vehicle.
The high-voltage interlocking circuit is used for checking the electrical continuity of the whole high-voltage circuit (high-voltage equipment, high-voltage wires and connectors) by using a low-voltage electrical signal, identifying abnormal disconnection of the circuit and timely disconnecting the high-voltage electricity. A common high voltage circuit interlock scheme is to connect high voltage device connectors in series to form a link that runs through all high voltage devices, as shown in fig. 1. When high-voltage equipment is disconnected from a high-voltage interlocking loop due to vibration, collision or human factors, the whole series loop is discontinuous, the control system identifies the disconnection of the high-voltage loop by detecting a signal of a terminal of the series loop, and then controls the high-voltage contactor to be incapable of being electrified, so that the electric shock prevention safety is improved. However, the design shown in fig. 1 has a certain risk that the system cannot detect when the high-voltage interlock loop itself is short-circuited, and the high-voltage component corresponding to the short-circuit is disconnected, because the high-voltage interlock loop is still continuous. Accordingly, it is desirable to have an improved high voltage interlock circuit and a fault detection scheme utilizing the same.
The above information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
In view of this, according to one aspect of the present invention, there is provided a high voltage interlock circuit including a plurality of high voltage components, a connector corresponding to each of the plurality of high voltage components, and an interlock line for connecting the plurality of high voltage components and the connector in series to form a high voltage interlock circuit, wherein the interlock line connects a pull-up resistor to a first potential at a first end thereof, and connects a pull-down resistor to a second potential at a second end thereof, wherein the first potential is higher than the second potential, and a resistor is connected in series within each of the plurality of high voltage components through which the interlock line passes, so that an electrical continuity fault of the high voltage interlock circuit can be determined by detecting a voltage ratio between the second end and the first end.
The high-pressure interlock circuit may further include: a detector for detecting a voltage ratio between the second terminal and the first terminal; and the determiner is used for determining whether an electrical continuity fault occurs in the high-voltage interlocking loop according to the voltage ratio.
In the above high-voltage interlock circuit, the first potential is 5V, and the second potential is 0V.
In the high-voltage interlock circuit, the connector is connected in parallel with the corresponding high-voltage component.
In the high-voltage interlock loop, the pull-up resistor, the pull-down resistor and the resistor connected in series in each high-voltage component have the same resistance value.
In the above-mentioned high-voltage interlock circuit, the determiner for determining whether an electrical continuity fault occurs in the high-voltage interlock circuit based on the voltage ratio is configured to determine that the high-voltage interlock circuit has no electrical continuity fault based on the detected voltage ratio between the second terminal and the first terminal being 1/(N +1), where N represents the number of the plurality of high-voltage components connected in series.
According to another aspect of the invention, a method of detecting an electrical continuity fault using a high voltage interlock loop is provided.
The method can comprise the following steps: and determining whether the high-voltage interlocking loop has the electrical continuity fault according to the detected voltage ratio between the second end and the first end.
In the above method, it is determined that the high-voltage interlock circuit has no electrical continuity fault when the detected voltage ratio is 1/(N +1), where N represents the number of the plurality of high-voltage components connected in series.
In the method, when the detected voltage ratio and the ratio P2/P1 of the second potential P2 and the first potential P1 are equal, the high-voltage interlocking loop is determined to have the fault that one or more high-voltage components are disconnected.
In the method, when the detected voltage ratio is 1/N, the short-circuit fault of the interlocking line is determined, wherein N represents the number of the plurality of high-voltage components connected in series.
According to yet another aspect of the invention, there is provided a computer storage medium comprising instructions that, when executed, cause a processor to perform the method as previously described.
According to yet another aspect of the present invention, there is provided an electric vehicle comprising a high voltage interlock circuit as described above.
The technical scheme of the high-voltage interlocking loop utilizes one high-voltage interlocking line to be connected with all high-voltage equipment of the electric automobile in series to form the high-voltage interlocking loop. The electrical continuity of the high voltage interlock loop is determined by measuring the ratio of the voltage value V2 at the pull-down resistor to the voltage value V1 at the pull-up resistor. That is, the ratio of V2 to V1 should be a constant value when electrical continuity is complete, and the ratio of V2 to V1 will change when an electrical continuity fault occurs, such as an accidental disconnection of a high voltage device connector. Therefore, according to the ratio of V2 to V1, the invention is used as the basis for checking the electrical continuity of the high-voltage interlocking loop, and when the ratio deviates from the normal range, the contactor on the high-voltage power line is controlled to be opened, so that electric shock is prevented. The technical scheme of the invention effectively solves the problem that the system cannot detect when the high-voltage interlocking loop per se is short-circuited in the prior art, and obtains good technical effect.
Other features and advantages of the methods and apparatus of the present invention will be more particularly apparent from or elucidated with reference to the drawings described herein, and the following detailed description of the embodiments used to illustrate certain principles of the invention.
Drawings
FIG. 1 is a schematic diagram of a prior art high pressure interlock circuit; and
fig. 2 to 4 show schematic diagrams of high-voltage interlock circuits according to embodiments of the present invention.
Detailed Description
The following description describes specific embodiments of the invention to teach those skilled in the art how to make and use the best mode of the invention. For the purpose of teaching inventive principles, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations from these embodiments that will fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the specific embodiments described below, but only by the claims and their equivalents.
In the context of the present invention, high and low voltages are relative to two battery systems of an electric vehicle. The battery system for driving is called a high-voltage battery system, and the 12V battery system for supplying power to a load and cold starting of an engine is called a low-voltage battery system. In an electric vehicle, the voltage of a high-voltage (storage) battery system is generally above 300V, far exceeding the safe voltage range, while the operating current of a high-voltage circuit is generally tens or hundreds of amperes.
According to an aspect of the present invention, there is provided a high voltage interlock circuit comprising a plurality of high voltage components, a connector corresponding to each of the plurality of high voltage components, and an interlock line for connecting the plurality of high voltage components and the connector in series so as to form a high voltage interlock circuit, wherein the interlock line connects a pull-up resistor to a first potential at a first end thereof, and connects a pull-down resistor to a second potential at a second end thereof, wherein the first potential is higher than the second potential, and a resistor is connected in series within each of the plurality of high voltage components through which the interlock line passes, so that an electrical continuity fault of the high voltage interlock circuit can be determined by detecting a voltage ratio between the second end and the first end.
Figure 2 shows a high-pressure interlock loop schematic of one embodiment of the present invention. As shown in fig. 2, unlike fig. 1, a resistor is connected in series in each of the plurality of high-voltage components through which the interlock line passes. With continued reference to fig. 2, in the high-voltage interlock loop, the first voltage level is 5V (i.e., 5V dc power), and the second voltage level is 0V (i.e., ground). Furthermore, in one embodiment, the connector is connected in parallel with its corresponding high-voltage component, and the pull-up resistor, the pull-down resistor, and the resistor connected in series in each high-voltage component have the same resistance.
In one embodiment, although not shown, the high-pressure interlock circuit may further include: a detector for detecting a voltage ratio between the second terminal and the first terminal; and the determiner is used for determining whether an electrical continuity fault occurs in the high-voltage interlocking loop according to the voltage ratio.
In one embodiment, the determiner is configured to determine whether the high voltage interlock loop has an electrical continuity fault based on the detected voltage ratio between the second terminal and the first terminal. For example, when the voltage ratio is 1/(N +1), where N represents the number of the plurality of high voltage components connected in series, it may be determined that the high voltage interlock circuit has no electrical continuity fault. For another example, when the voltage ratio is equal to the ratio P2/P1 of the second potential P2 to the first potential P1, it can be determined that the high voltage interlock circuit has a fault in which one or more high voltage components are disconnected. For another example, when the detected voltage ratio is 1/N, it is determined that the interlock line itself has a short-circuit fault, where N represents the number of the plurality of high-voltage components connected in series.
According to the invention, two loop faults, namely a fault when the ① high-voltage connector is disconnected and a fault when the ② high-voltage interlocking wire per se is short-circuited can be respectively judged according to the change of the ratio of V2 to V1.
Taking the schematic diagram of the high-voltage interlock circuit shown in fig. 2 as an example, when the high-voltage interlock circuit is connected in series with two high-voltage components, the circuit resistor includes a pull-up resistor 1, a pull-down resistor 2, a resistor 3 connected in series in the high-voltage component 1, and a resistor 4 connected in series in the high-voltage component 2, and each resistor has a resistance value of R.
When the electrical continuity of the high-voltage interlocking loop is complete, the voltage division principle of the series circuit is used for obtaining:
voltage ratio at this time
The basis of no fault of the high-voltage interlocking loop is obtained.
Figure 3 shows the situation with the high-voltage components disengaged. When a disconnection fault occurs at a connector at a certain position of a high-voltage loop, such as when a high-voltage power line of the connector 1 in fig. 3 is disconnected accidentally, the voltage division principle of the series circuit is used for obtaining:
the voltage ratio V2/V1=0 at this time is the basis for the disconnection fault of the high-voltage interlock circuit connector.
Fig. 4 shows a case where the interlock line is short-circuited. When a short-circuit fault occurs in the high-voltage interlock line itself, such as a short-circuit fault between a position a and a position B of the high-voltage interlock line in fig. 4, the short-circuit fault is obtained according to the voltage division principle of the series circuit:
the voltage ratio V2/V1=1/2 is the basis for the short-circuit fault of the high-voltage interlock line itself.
In one embodiment, when the system detects that the high voltage circuit is disconnected or the high voltage interlock line itself has a short circuit fault, the system will prevent the high voltage power from being powered up and will alert the driver to service the vehicle.
In summary, the high-voltage interlock circuit of the present invention, based on the voltage division principle of the series circuit, is not only beneficial to detecting the most common fault of disconnection between different components in the high-voltage interlock circuit, but also capable of detecting the fault of short circuit of the high-voltage interlock line itself, so as to avoid the occurrence of the situation that the system cannot detect the fault of disconnection of the high-voltage components due to the short circuit of the high-voltage interlock line itself.
According to another aspect of the invention, a method of detecting an electrical continuity fault using a high voltage interlock loop is provided. In one embodiment, the method may include: and determining whether the high-voltage interlocking loop has the electrical continuity fault according to the detected voltage ratio between the second end and the first end. When the detected voltage ratio is 1/(N +1), it is determined that the high-voltage interlock loop has no electrical continuity fault, where N represents the number of the plurality of high-voltage components connected in series. When the detected voltage ratio and the ratio P2/P1 of the second potential P2 to the first potential P1 are equal, it can be determined that the high-voltage interlock loop has a fault in which one or more high-voltage components are disconnected. In addition, when the detected voltage ratio is 1/N, the short-circuit fault of the interlocking line is determined, wherein N represents the number of the plurality of high-voltage components connected in series.
As will be appreciated by one skilled in the art, various embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of hardware, software, or a combination of hardware and software. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein. For example, these computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable processing device to produce a sequence of instructions that implement specified operations.
In summary, according to the technical scheme of the high-voltage interlock circuit, one high-voltage interlock line is connected in series with all high-voltage devices of the electric vehicle to form the high-voltage interlock circuit. The electrical continuity of the high voltage interlock loop is determined by measuring the ratio of the voltage value V2 at the pull-down resistor to the voltage value V1 at the pull-up resistor. That is, the ratio of V2 to V1 should be a constant value when electrical continuity is complete, and the ratio of V2 to V1 will change when an electrical continuity fault occurs, such as an accidental disconnection of a high voltage device connector. Therefore, according to the ratio of V2 to V1, the invention is used as the basis for checking the electrical continuity of the high-voltage interlocking loop, and when the ratio deviates from the normal range, the contactor on the high-voltage power line is controlled to be opened, so that electric shock is prevented. The technical scheme of the invention effectively solves the problem that the system cannot detect when the high-voltage interlocking loop per se is short-circuited in the prior art, and obtains good technical effect.
The above examples mainly illustrate the high-voltage interlock circuit, the method for detecting an electrical continuity fault using the high-voltage interlock circuit, the computer storage medium, and the electric vehicle of the present invention. Although only a few embodiments of the present invention have been described in detail, those skilled in the art will appreciate that the present invention may be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and various modifications and substitutions may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (13)
1. A high voltage interlock loop comprising a plurality of high voltage components, a connector corresponding to each of the plurality of high voltage components, and an interlock line for connecting the plurality of high voltage components and the connector in series to form a high voltage interlock loop, wherein the interlock line connects a pull-up resistor to a first potential at a first end thereof, the interlock line connects a pull-down resistor to a second potential at a second end thereof, wherein the first potential is higher than the second potential, and a resistor is connected in series within each of the plurality of high voltage components through which the interlock line passes, such that an electrical continuity fault of the high voltage interlock loop can be determined by detecting a voltage ratio between the second end and the first end.
2. The high voltage interlock circuit of claim 1, further comprising:
a detector for detecting a voltage ratio between the second terminal and the first terminal; and
a determiner for determining whether an electrical continuity fault occurs in the high voltage interlock loop based on the voltage ratio.
3. The high voltage interlock circuit of claim 1, wherein the first potential P1 is 5V and the second potential P2 is 0V.
4. The high voltage interlock circuit of claim 1, wherein the connector is in parallel with its corresponding high voltage component.
5. The high voltage interlock loop of any one of claims 1 to 4, wherein the pull-up resistor, the pull-down resistor, and the series connected resistors within each high voltage component have the same resistance.
6. The high voltage interlock loop of claim 5, wherein the determiner for determining from the voltage ratio whether an electrical continuity fault has occurred in the high voltage interlock loop is configured to determine that the high voltage interlock loop has no electrical continuity fault based on the detected voltage ratio between the second end and the first end being 1/(N +1), where N represents the number of the plurality of high voltage components connected in series.
7. A method of detecting an electrical continuity fault using the high voltage interlock loop of any one of claims 1 to 6.
8. The method of claim 7, wherein the method comprises:
and determining whether the high-voltage interlocking loop has the electrical continuity fault according to the detected voltage ratio between the second end and the first end.
9. The method of claim 8, wherein when the detected voltage ratio is 1/(N +1), it is determined that the high voltage interlock loop is free of electrical continuity fault, where N represents the number of multiple high voltage components connected in series.
10. The method of claim 8, wherein the high voltage interlock loop is determined to have a fault with one or more high voltage components disengaged when the detected voltage ratio and the ratio P2/P1 of the second potential P2 to the first potential P1 are equal.
11. The method of claim 8, wherein when the detected voltage ratio is 1/N, it is determined that the interlock line itself has a short-circuit fault, where N represents the number of the plurality of high-voltage components connected in series.
12. A computer storage medium comprising instructions that, when executed, cause a processor to perform the method of any of claims 7 to 11.
13. An electric vehicle comprising the high voltage interlock circuit of any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810895646.9A CN110857964A (en) | 2018-08-08 | 2018-08-08 | High-voltage interlocking loop, method for detecting electrical continuity fault by using high-voltage interlocking loop, computer storage medium and electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810895646.9A CN110857964A (en) | 2018-08-08 | 2018-08-08 | High-voltage interlocking loop, method for detecting electrical continuity fault by using high-voltage interlocking loop, computer storage medium and electric vehicle |
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Cited By (2)
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| CN113608145A (en) * | 2021-07-14 | 2021-11-05 | 科华数据股份有限公司 | Multi-path photovoltaic module ground fault detection device and detection method |
| CN114030383A (en) * | 2021-10-15 | 2022-02-11 | 智新控制系统有限公司 | High-voltage interlocking detection system and method |
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