CN110605964B - High-voltage interlocking detection method and system - Google Patents
High-voltage interlocking detection method and system Download PDFInfo
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- CN110605964B CN110605964B CN201810617667.4A CN201810617667A CN110605964B CN 110605964 B CN110605964 B CN 110605964B CN 201810617667 A CN201810617667 A CN 201810617667A CN 110605964 B CN110605964 B CN 110605964B
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- 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
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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Abstract
The embodiment of the invention relates to the field of new energy automobile safety protection, and discloses a high-voltage interlocking detection method and system. The method is applied to a high-voltage interlocking detection circuit, which comprises a high-voltage connector and a detection circuit; the detection circuit comprises a processing unit, a signal acquisition unit, a pull-up resistor, a pull-down resistor, a first sampling path and a second sampling path; the first low-voltage connecting end of the high-voltage connector is respectively connected with the first sampling path and the pull-up resistor, and the pull-up resistor is also connected with the power supply unit; the second low-voltage connecting end is respectively connected with the pull-down resistor and the second sampling path; the processing unit is connected with the first sampling point of the first sampling path and the second sampling point of the second sampling path through the signal acquisition unit, and the connection state of the high-voltage connector can be determined through the voltage of the first sampling point and the voltage of the second sampling point. The embodiment of the invention can be used for solving the problem of a specific high-voltage connector by configuring a corresponding detection circuit for each high-voltage connector.
Description
Technical Field
The embodiment of the invention relates to the field of new energy automobile safety protection, in particular to a high-voltage interlocking detection method and system.
Background
With the increasing severity of environmental pollution, the market demand for new energy automobiles is continuously expanded, and the requirements for new energy automobile technology are increasingly strict, especially the safety performance of new energy automobiles. The high-voltage connector (high-voltage maintenance switch) is used as a key part for controlling the on-off of a high-voltage loop, and the connection state of the high-voltage connector directly influences the functions of charging, driving and the like of an automobile, so that the in-place detection of the high-voltage connector becomes very important.
In the prior art, a high-voltage interlock detection method is generally adopted to detect the connection state of a high-voltage connector. However, in the existing high-voltage interlock detection method, all high-voltage connectors are connected in series with the anti-failure resistor through a low-voltage detection wire harness (different high-voltage connectors are connected in series through the low-voltage detection wire harness, and the starting end and the ending end of the low-voltage detection wire harness are both connected with the high-voltage interlock detection component); then, the high-voltage interlock detection part detects the state in which the high-voltage interlock detection part, all the high-voltage connectors, and the low-voltage detection harness are connected to the high-voltage connectors through the low-voltage detection harness. The inventors of the present invention have found that such a detection method has at least the following problems: (1) the high-voltage interlocking detection system connects all high-voltage connectors with the anti-failure resistor in series through a low-voltage detection wire harness, and when abnormality occurs, the specific high-voltage connector cannot be positioned; this problem is particularly acute in electric busses comprising a plurality of electrical boxes, each with a high voltage connector, which can lead to increased after-market maintenance costs; (2) different high voltage connector establish ties through low-voltage detection pencil, can lead to low-voltage detection pencil overlength, segmentation too much (the junction is too much) scheduling problem, and low-voltage detection pencil overlength and junction are too much, can make the impedance increase of introducing, and this will cause uncertain influence to the detection mode based on preventing that the resistance of failure resistor formulates, can reduce detecting system's reliability.
Disclosure of Invention
An object of embodiments of the present invention is to provide a high voltage interlock detection circuit method and system that can accurately locate a specific high voltage connector without relying on an external anti-fault resistor, and improve the reliability of the detection system.
In order to solve the above technical problem, an embodiment of the present invention provides a high voltage interlock detection method, which is applied to a high voltage interlock detection circuit, where the circuit includes: the detection circuit comprises a high-voltage connector and a detection circuit corresponding to the high-voltage connector; the high-voltage connector comprises a first low-voltage connecting end and a second low-voltage connecting end; the detection circuit comprises a processing unit, a signal acquisition unit, a power supply unit, a pull-up resistor, a pull-down resistor, a first sampling path and a second sampling path; the first low-voltage connecting end is respectively connected with the first sampling path and one end of the pull-up resistor, and the other end of the pull-up resistor is connected with the power supply unit; the second low-voltage connecting end is respectively connected with the pull-down resistor and the second sampling path; the processing unit is respectively connected with a first sampling point of the first sampling path and a second sampling point of the second sampling path through the signal acquisition unit; the method comprises the following steps: respectively acquiring the voltage of the first sampling point and the voltage of the second sampling point through the signal acquisition unit; and determining the connection state of the high-voltage connector according to the voltage of the first sampling point and the voltage of the second sampling point.
The embodiment of the invention also provides a high-voltage interlocking detection system which comprises a high-voltage box and at least one electric box; the high-voltage box and the electric box form a loop; the high-voltage box and each electric box comprise the high-voltage interlocking detection circuit.
Compared with the prior art, the embodiment of the invention has the advantages that the detection circuit is connected between the first connecting end and the second connecting end of each high-voltage connector, and the detection circuit can judge the connection state of the corresponding high-voltage connector according to the voltage of the first sampling point and the voltage of the second sampling point without depending on an external anti-failure resistor. In addition, for a circuit comprising a plurality of high-voltage connectors, the scheme of configuring each high-voltage connector with a corresponding detection circuit can solve the problem of a specific high-voltage connector and improve the reliability of a detection system.
In addition, the determining the connection state of the high-voltage connector according to the voltage of the first sampling point and the voltage of the second sampling point specifically includes: judging whether the voltage of the first sampling point is equal to the voltage of the second sampling point; if the voltage values are equal, judging the connection state of the high-voltage connector according to the voltage value of the first sampling point or the voltage value of the second sampling point; and if not, judging that the high-voltage connector has an open-circuit fault.
In addition, the determining the connection state of the high-voltage connector according to the voltage value of the first sampling point or the voltage value of the second sampling point specifically includes: if the voltage value of the first sampling point or the voltage value of the second sampling point is equal to the voltage provided by the power supply unit, determining that a high-voltage interlocking detection port of the high-voltage connector is short-circuited with a power supply; and if the voltage value of the first sampling point or the voltage value of the second sampling point is equal to 0, judging that the high-voltage interlocking detection port of the high-voltage connector is short-grounded.
In addition, after determining the connection state of the high voltage connector, the method further comprises: and reporting the determined connection state of the high-voltage connector to a main control unit.
In addition, the first sampling path includes a first voltage division unit; the first voltage division unit is respectively connected with the first low-voltage connecting end and the pull-up resistor; the second sampling path comprises a second voltage division unit; the second voltage division unit is respectively connected with the second low-voltage connecting end and the pull-down resistor.
In addition, the first sampling point is a connection point of the first sampling path and the first low-voltage connection end; the second sampling point is a connection point of the second sampling path and the second low-voltage connection end.
In addition, the first voltage division unit comprises a first voltage division resistor and a second voltage division resistor which are connected in series; the first sampling point is a connection point between the first voltage-dividing resistor and the second voltage-dividing resistor; the second voltage division unit comprises a third voltage division resistor and a fourth voltage division resistor which are connected in series; the second sampling point is a connection point between the third voltage dividing resistor and the fourth voltage dividing resistor.
In addition, the pull-up resistor and the pull-down resistor are kiloohm resistors; the resistance value of the second voltage division unit is at least one order of magnitude higher than that of the pull-down resistor. The second voltage division unit is connected with the pull-down resistor in parallel, the voltage division ratio can be influenced by the size of the second voltage division unit, the resistance value of the second voltage division unit is limited to be at least one order of magnitude higher than that of the pull-down resistor, the resistance value after the second voltage division unit is connected in parallel can be enabled to be closer to that of the pull-down resistor, and therefore the influence of the second voltage division unit on the voltage divided by the pull-down resistor is reduced.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic diagram of a high voltage interlock detection circuit according to a first embodiment of the present invention;
FIG. 2 is a detailed flow chart of a high voltage interlock detection method according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a high voltage interlock detection circuit according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram of a high voltage interlock detection circuit according to a third embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a high voltage interlock detection system according to a fourth embodiment of the present invention;
fig. 6 is a schematic structural view of an electric box according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
A first embodiment of the invention relates to a high-voltage interlock detection method. The method is applied to a high-voltage interlocking detection circuit, and the circuit specifically comprises a high-voltage connector and a detection circuit corresponding to the high-voltage connector. As shown in fig. 1, the high voltage connector (see fig. 6) includes a first low voltage connection a1 and a second low voltage connection a 2. The detection circuit specifically comprises a processing unit, a signal acquisition unit, a power supply unit VDD, a pull-up resistor Rup, a pull-down resistor Rdown, a first sampling path (such as a circuit I in fig. 1) and a second sampling path (such as a circuit II in fig. 1). The first low-voltage connecting end A1 is respectively connected with the first sampling path and one end of a pull-up resistor Rup, and the other end of the pull-up resistor Rup is connected with a power supply unit VDD; the second low-voltage connecting end A2 is respectively connected with the pull-down resistor Rdown and the second sampling path; the processing unit is respectively connected with the first sampling point B1 of the first sampling path and the second sampling point B2 of the second sampling path through the signal acquisition unit.
The present embodiment will be described by taking, as an example, the first sampling point B1 as a connection point between the first sampling path and the first low-voltage connection terminal a1, and the second sampling point B2 as a connection point between the second sampling path and the second low-voltage connection terminal a 2.
In this embodiment, the processing unit may respectively obtain the voltage of the first sampling point B1 and the voltage of the second sampling point B2 through the signal acquisition unit, and determine the connection state of the high voltage connector according to the voltage of the first sampling point B1 and the voltage of the second sampling point B2. Specifically, an equivalent resistor Rshort is present between the first low-voltage connection a1 and the second low-voltage connection a2 of the high-voltage connector. Voltage at first sampling point B1: v1 ═ VDD (Rdown + Rshort)/(Rup + Rdown + Rshort), voltage at second sampling point B2: v2 ═ VDD × Rdown/(Rup + Rdown + Rshort). Under the open circuit condition, Rshort is infinite, and at the moment, V1 is not equal to V2; in the non-open case, Rshort is approximately 0, at which point V1 equals V2. The non-open circuit condition includes normal condition, short circuit of the high voltage interlock detection port of the high voltage connector, short circuit of the power supply, short circuit of the ground, etc., and in these conditions, although V1 is equal to V2, the specific values thereof are different. For example, V1 ═ V2 ═ VDD ═ Rdown/(Rup + Rdown) is normal; in the case of short-circuit power supply, the first low-voltage connection a1 is directly connected to the power supply unit VDD, where V1 is V2 is VDD; in the case of short-circuit ground, the second low-voltage connection a2 is connected directly to ground, in which case V1-V2-0. Therefore, after acquiring the voltage V1 at the first sampling point B1 and the voltage V2 at the second sampling point B2, the processing unit may first determine whether the two are equal to each other (i.e., whether V1 is equal to V2); if the voltage values are not equal, the high-voltage connector can be judged to be in an open-circuit fault; if the voltage values are equal, whether the high-voltage connector is normally connected or the high-voltage interlock detection port is short-circuited with the power supply or the high-voltage interlock detection port is short-circuited with the ground can be judged according to the specific value of the voltage V1 at the first sampling point B1 or the voltage V2 at the second sampling point B2. In addition, it is worth mentioning that, in practical applications, due to the resistance of the wire and the error of signal conversion performed by the sampling port of the signal acquisition unit, the voltage of the first sampling point and the voltage of the second sampling point cannot be absolutely equal, so that in the present embodiment, as long as the difference between the voltage of the first sampling point and the voltage of the second sampling point is within the allowable error range, the voltage of the first sampling point and the voltage of the second sampling point are considered to be equal. The specific flow of the present embodiment is shown in fig. 2:
step 201: and respectively acquiring the voltage of the first sampling point and the voltage of the second sampling point through the signal acquisition unit.
After the voltage of the first sampling point and the voltage of the second sampling point are obtained, the connection state of the high-voltage connector can be determined according to the voltage of the first sampling point and the voltage of the second sampling point, which can be seen in steps 202 to 210.
Step 202: and judging whether the voltage of the first sampling point is equal to the voltage of the second sampling point. If yes, go to step 204; if not, go to step 203.
As described above, in the open circuit case, the voltage at the first sampling point is not equal to the voltage at the second sampling point, and in the non-open circuit case, the voltage at the first sampling point is equal to the voltage at the second sampling point. It should be noted that, in practical applications, due to the existence of the wire resistor and the error of the signal conversion performed by the sampling port of the signal acquisition unit, the voltage of the first sampling point and the voltage of the second sampling point cannot be absolutely equal. Therefore, in the present embodiment, as long as the difference between the voltage at the first sampling point and the voltage at the second sampling point is within the allowable error range, the voltage at the first sampling point and the voltage at the second sampling point are considered to be equal.
It should be mentioned that the open-circuit fault belongs to a critical fault, and in the embodiment, a judgment condition (that is, whether the voltage of the first sampling point is equal to the voltage of the second sampling point) is set first to distinguish the critical fault from the non-critical fault, so that the effectiveness of diagnosis can be improved.
Step 203: and determining that the high-voltage connector has an open-circuit fault.
It is worth mentioning that the non-open circuit condition includes normal connection, short-circuit power supply and short-circuit ground of the high-voltage interlock detection port of the high-voltage connector, etc. In these cases, the voltage at the first sampling point is equal to the voltage at the second sampling point, but the specific values are different. Therefore, after the voltage at the first sampling point is determined to be equal to the voltage at the second sampling point, the connection state of the high voltage connector can be determined according to the value of the voltage at the first sampling point or the voltage at the second sampling point, see steps 204 to 210.
Step 204: and judging whether the voltage value of the first sampling point or the second sampling point is equal to the voltage provided by the power supply unit. If yes, go to step 205; if not, go to step 206.
In practical applications, if a difference between a voltage at the first sampling point or a voltage at the second sampling point and a voltage provided by the power supply unit is within an allowable error range, the voltage at the first sampling point or the voltage at the second sampling point may be considered to be equal to the voltage provided by the power supply unit.
Step 205: and determining that the high-voltage interlocking detection port of the high-voltage connector is short-circuited with the power supply.
Step 206: and judging whether the voltage of the first sampling point or the voltage of the second sampling point is equal to 0 or not. If yes, go to step 207; if not, step 208 is entered.
In this step, when the value of the voltage at the first sampling point or the voltage at the second sampling point is within the allowable error range and can be approximated to 0, the value of the voltage at the first sampling point or the voltage at the second sampling point is considered to be equal to 0.
Step 207: and judging that the high-voltage interlocking detection port of the high-voltage connector is short-grounded.
Step 208: and judging whether the voltage of the first sampling point or the voltage of the second sampling point is equal to a preset value or not. If yes, go to step 209; if not, go to step 210.
The present embodiment can use the voltage of the first sampling point or the voltage of the second sampling point as the preset value under normal conditions. Specifically, for the present embodiment, the preset values may be: VDD × Rdown/(Rup + Rdown). In practical applications, if a difference between the voltage at the first sampling point or the voltage at the second sampling point and the preset value is within an allowable error range, the voltage at the first sampling point or the voltage at the second sampling point may be considered to be equal to the preset value.
Step 209: and judging that the high-voltage connector is normally connected.
Step 210: other conditions exist for the decision circuit.
Such other situations may include: the resistance is invalid (for example, the resistance value of the pull-up resistor is shifted), the acquisition port of the signal acquisition unit is failed, and the like, which is not limited in this embodiment.
In the diagnosis strategy, the sequence of the judgment conditions is concerned with the distinction of the critical faults and the non-critical faults, and in the embodiment, whether the critical faults (open faults) exist or not is determined, and under the condition that the critical faults do not exist, the types of the non-critical faults are determined. The sequential arrangement of the judgment conditions is beneficial to improving the effectiveness of diagnosis and avoiding misdiagnosis and missed diagnosis.
Step 211: and reporting the determined connection state to the main control unit.
After determining the connection state of the high-voltage connector (such as an open-circuit fault or a short-circuit power supply of a high-voltage interlocking detection interface of the high-voltage connector), the processing unit CAN report the determined connection state to a main control unit (such as a Battery Management Unit (BMU)) through the CAN bus. The connection state of the high-voltage connector is reported to the main control unit in time, and maintenance personnel can be reminded in time.
It should be noted that, in fig. 2, the processing unit reports all the determined connection statuses to the main control unit. However, in practical applications, the processing unit may only report the preset connection state to the main control unit, and if the determined connection state does not belong to the preset connection state, the processing unit does not report the connection state. The preset connection state may include an open circuit fault, a short circuit of the high-voltage interlock detection port of the high-voltage connector, and a short circuit of the high-voltage interlock detection port of the high-voltage connector, but not limited thereto.
In addition, in practical application, a high-voltage connector and a circuit board are arranged in each high-voltage box and each electric box, and a detection circuit corresponding to the high-voltage connector is fixed on the circuit board. In the embodiment, the MCU on the circuit board can be directly selected as the processing unit in the detection circuit, so that the resource of the MCU in the main control unit is not required to be occupied. In addition, a battery monitoring unit (CSC) can be arranged on the circuit board, and on one hand, the battery monitoring unit can provide a power supply for the detection circuit; on the other hand, the processing unit can collect the voltage of the first sampling point B1 and the voltage of the second sampling point B2 through the battery monitoring unit. That is, the power supply unit and the signal acquisition unit in the present embodiment can be implemented by the battery monitoring unit.
In this embodiment, the pull-up resistor Rup and the pull-down resistor Rdown may preferably be resistors of kilo-ohm order. This helps promoting the discernment precision to equivalent resistance, and can play the effect of current-limiting protection to the circuit.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
Compared with the prior art, the detection circuit is connected between the first connecting end and the second connecting end of each high-voltage connector, and the detection circuit can judge the connection state of the corresponding high-voltage connector according to the voltage of the first sampling point and the voltage of the second sampling point without depending on an external anti-failure resistor. In addition, for a circuit comprising a plurality of high-voltage connectors, the scheme of configuring each high-voltage connector with a corresponding detection circuit can solve the problem of a specific high-voltage connector and improve the reliability of a detection system.
A second embodiment of the invention relates to a high-voltage interlock detection method. The embodiment is a further improvement on the basis of the first embodiment, and the main improvement is as follows: in this embodiment, the first sampling path includes a first voltage dividing unit, and the second sampling path includes a second voltage dividing unit.
As shown in fig. 3, the first voltage dividing unit is connected to the first low voltage connection terminal a1 and the pull-up resistor Rup, and the second voltage dividing unit is connected to the second low voltage connection terminal a2 and the pull-down resistor Rdown. In this embodiment, the first sampling point B1 is still the connection point between the first sampling path and the first low voltage connection a1 (i.e., the connection point between the first voltage dividing unit and the first low voltage connection a 1), and the second sampling point B2 is still the connection point between the second sampling path and the second low voltage connection a2 (i.e., the connection point between the second voltage dividing unit and the second low voltage connection a 2).
In this embodiment, the processing unit can still obtain the voltage of the first sampling point B1 and the voltage of the second sampling point B2 through the signal acquisition unit, and determine the connection state of the high voltage connector according to the voltage of the first sampling point B1 and the voltage of the second sampling point B2. Specifically, assuming that the resistance of the first voltage dividing unit is Rx and the resistance of the second voltage dividing unit is Ry, the voltage at the first sampling point B1: v1 ═ VDD [ (Rdown// Ry + Rshort)// Rx ]/[ (Rdown// Ry + Rshort)// Rx + Rup ], voltage of B2 at the second sample point: v2 ═ V1 (Rdown// Ry)/(Rdown// Ry + Rshort). Under the open circuit condition, Rshort is infinite, and at the moment, V1 is not equal to V2; in the non-open case, Rshort is approximately 0, at which point V1 equals V2. The non-open circuit condition comprises a normal condition, a condition that a high-voltage interlocking detection port of the high-voltage connector is short-circuited and short-grounded, and the like, wherein in the normal condition, V1 is V2 is VDD (Rdown// Ry// Rx)/(Rdown// Ry// Rx + Rup); in the case of short-circuit power supply, V1-V2-VDD; in the short-circuit case, V1 ═ V2 ═ 0. Therefore, in the present embodiment, after acquiring the voltage V1 at the first sampling point B1 and the voltage V2 at the second sampling point B2, the processing unit may first determine whether the two voltages are equal to each other (i.e., whether V1 is equal to V2); if the voltage values are not equal, the high-voltage connector can be judged to be in an open-circuit fault; if the voltage values are equal, whether the high-voltage connector is normally connected or not, and whether the high-voltage interlocking detection port of the high-voltage connector is short-circuited or short-circuited to the ground or not can be judged according to the specific value of the voltage V1 at the first sampling point B1 or the voltage V2 at the second sampling point B2.
It should be noted that in the present embodiment, in step 208, it is determined whether the value of the voltage at the first sampling point or the voltage at the second sampling point is equal to the preset value. The preset values can be set as: VDD × Rdown/(Rup + Rdown). In practical applications, if a difference between the voltage at the first sampling point or the voltage at the second sampling point and the preset value is within an allowable error range, the voltage at the first sampling point or the voltage at the second sampling point may be considered to be equal to the preset value. Other steps are the same as those in the first embodiment, and are not described in detail in this embodiment.
In practical applications, the first voltage dividing unit and the second voltage dividing unit may be implemented by a resistor circuit, which is not limited in this embodiment. In addition, when the second voltage division unit is used, the resistance value of the second voltage division unit can be at least one order of magnitude higher than that of the pull-down resistor Rdown. This is because: the second voltage division unit is connected with the pull-down resistor Rdown in parallel, the voltage division ratio can be influenced by the size of the second voltage division unit, the resistance value of the second voltage division unit is limited to be at least one order of magnitude higher than that of the pull-down resistor Rdown, the resistance value after parallel connection can be enabled to be closer to that of the pull-down resistor Rdown, and therefore the influence of the second voltage division unit on the voltage divided by the pull-down resistor Rdown is reduced. The first voltage dividing unit may be the same as the second voltage dividing unit, and this embodiment is not limited thereto.
It should be noted that, in the first embodiment and the second embodiment, the voltage of the signal acquisition unit can be reduced by reducing the power supply voltage provided by the power supply unit, so as to reduce the requirement for the maximum voltage that the signal acquisition unit can bear.
This embodiment provides another high voltage interlock detection circuit relative to the first embodiment.
A third embodiment of the invention relates to a high-voltage interlock detection method. The embodiment is a further improvement on the basis of the second embodiment, and the main improvement is as follows: in this embodiment, the first voltage dividing unit includes a first voltage dividing resistor and a second voltage dividing resistor connected in series, and the first sampling point is a connection point between the first voltage dividing resistor and the second voltage dividing resistor; the second voltage division unit comprises a third voltage division resistor and a fourth voltage division resistor which are connected in series; the second sampling point is a connection point between the third voltage dividing resistor and the fourth voltage dividing resistor.
As shown in fig. 4, in the present embodiment, the first voltage dividing unit includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2, wherein one end of the first voltage dividing resistor R1 is connected to the first low voltage connection terminal a1 and the pull-up resistor Rup, and the other end is grounded through the second voltage dividing resistor R2. The first sampling point B1 is the connection point between the first voltage dividing resistor R1 and the second voltage dividing resistor R2. The second voltage dividing unit comprises a third voltage dividing resistor R3 and a fourth voltage dividing resistor R4, wherein one end of the third voltage dividing resistor R3 is connected to the second low-voltage connection terminal a2 and the pull-down resistor Rdown, and the other end of the third voltage dividing resistor R3 is grounded through the fourth voltage dividing resistor R4. The second sample point B2 is the connection point between the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4.
In this embodiment, the signal acquisition unit can still obtain the voltage of the first sampling point B1 and the voltage of the second sampling point B2, and determine the connection state of the high voltage connector according to the voltage of the first sampling point B1 and the voltage of the second sampling point B2. Specifically, the voltage at the first sampling point B1: v1 ═ VDD [ (Rdown// (R3+ R4) + Rshort)// (R1+ R2) ]/[ (Rdown// (R3+ R4) + Rshort)// (R1+ R2) + Rup ], voltage of B2 at second sampling point: v2 ═ V1 ═ Rdown// (R3+ R4) ]/[ Rdown// (R3+ R4) + Rshort ]. Under the open circuit condition, Rshort is infinite, and at the moment, V1 is not equal to V2; in the non-open case, Rshort is approximately 0, at which point V1 equals V2. The non-open circuit condition includes a normal condition, a condition that a high-voltage interlocking detection port of the high-voltage connector is short-circuited and short-circuited, and the like, wherein in the normal condition, V1 is V2 (VDD) [ Rdown// (R3+ R4)// (R1+ R2) ]/[ Rdown// (R3+ R4)/(R1 + R2) + Rup ]; in the case of short-circuit power supply, V1-V2-VDD; in the short-circuit case, V1 ═ V2 ═ 0. Therefore, in the present embodiment, after acquiring the voltage V1 at the first sampling point B1 and the voltage V2 at the second sampling point B2, the processing unit may first determine whether the two voltages are equal to each other (i.e., whether V1 is equal to V2); if the voltage values are not equal, the high-voltage connector can be judged to be in an open-circuit fault; if the voltage values are equal, whether the high-voltage connector is normally connected or not, and whether the high-voltage interlocking detection port of the high-voltage connector is short-circuited or short-circuited to the ground or not can be judged according to the specific value of the voltage V1 at the first sampling point B1 or the voltage V2 at the second sampling point B2.
It should be noted that in the present embodiment, in step 208, it is determined whether the value of the voltage at the first sampling point or the voltage at the second sampling point is equal to the preset value. The preset values can be set as: VDD [ Rdown// (R3+ R4)// (R1+ R2) ]/[ Rdown// (R3+ R4)// (R1+ R2) + Rup ]. In practical applications, if a difference between the voltage at the first sampling point or the voltage at the second sampling point and the preset value is within an allowable error range, the voltage at the first sampling point or the voltage at the second sampling point may be considered to be equal to the preset value. Other steps are the same as those in the first embodiment or the second embodiment, and are not described in detail in this embodiment.
In practical applications, the first voltage dividing resistor R1 may be the same as the third voltage dividing resistor R3, and the second voltage dividing resistor R2 may be the same as the fourth voltage dividing resistor R4. The third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 may be at least an order of magnitude higher than the resistance of the pull-down resistor Rdown, so as to reduce the influence of the second voltage dividing unit on the voltage divided by the pull-down resistor Rdown.
Compared with the first embodiment or the second embodiment, the first sampling point is set as the connection point between the first voltage-dividing resistor and the second voltage-dividing resistor, and the second sampling point is set as the connection point between the third voltage-dividing resistor and the fourth voltage-dividing resistor, so that the design can reduce the requirement on the maximum voltage which can be acquired by the signal acquisition unit, and can better achieve the purpose of current-limiting protection.
A fourth embodiment of the present invention relates to a high-voltage interlock detection system. As shown in fig. 5, the system includes a high voltage box and at least one electrical box; the high-voltage box and the electric box form a loop. The high-voltage box and each electric box comprise the high-voltage interlock detection circuit in the first embodiment, the second embodiment or the third embodiment.
It should be noted that fig. 5 illustrates the system including the high voltage box and 6 electrical boxes, and the number of the electrical boxes is not limited in practical applications. The high-voltage box and each electric box are provided with a circuit board and a high-voltage connector. Taking an electrical box as an example, as shown in fig. 6, the high-voltage connector 61 is fixed in the electrical box, the corresponding detection circuit is disposed on the circuit board 62, and the detection circuit is connected to the first low-voltage connection end a1 and the second low-voltage connection end a2 of the high-voltage connector 61 through a high-voltage interlock detection line 63. In the embodiment, each high-voltage connector is provided with a corresponding detection circuit, and the connection state of the corresponding high-voltage connector can be judged through the detection circuit. The detection circuit may be the detection circuit described in the first embodiment, the second embodiment, or the third embodiment. In addition, it should be noted that, in practical applications, components arranged in each electrical box include, but are not limited to, the portion illustrated in fig. 6 (for example, a battery pack is further arranged in each electrical box, and a high-voltage connector is connected to the battery pack), and therefore, description of this embodiment is omitted.
In practical application, the MCU on the circuit board where the high-voltage connector is located can be directly selected and used as the processing unit in the detection circuit corresponding to the high-voltage connector, so that the MCU resource in the main control unit is not occupied. After judging the connection state of the corresponding high-voltage connector, each processing unit CAN report the determined connection state to the main control unit through the CAN bus.
Compared with the prior art, the embodiment has the advantages that the detection circuit for judging the connection state of each high-voltage connector is configured for each high-voltage connector, so that the problem of positioning to a specific high-voltage connector when a fault occurs is solved, and meanwhile, the reliability of the detection system is improved.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (7)
1. A high-voltage interlock detection method is applied to a high-voltage interlock detection circuit, and the circuit comprises: the detection circuit comprises a high-voltage connector and a detection circuit corresponding to the high-voltage connector;
the high-voltage connector comprises a first low-voltage connecting end and a second low-voltage connecting end; the detection circuit comprises a processing unit, a signal acquisition unit, a power supply unit, a pull-up resistor, a pull-down resistor, a first sampling path and a second sampling path; the first low-voltage connecting end is respectively connected with the first sampling path and one end of the pull-up resistor, and the other end of the pull-up resistor is connected with the power supply unit; the second low-voltage connecting end is respectively connected with the pull-down resistor and the second sampling path; the processing unit is respectively connected with a first sampling point of the first sampling path and a second sampling point of the second sampling path through the signal acquisition unit;
the method comprises the following steps:
respectively acquiring the voltage of the first sampling point and the voltage of the second sampling point through the signal acquisition unit;
judging whether the voltage of the first sampling point is equal to the voltage of the second sampling point;
if the voltage values are not equal, judging that the high-voltage connector has an open-circuit fault;
if the voltage values are equal, judging the connection state of the high-voltage connector according to the voltage value of the first sampling point or the voltage value of the second sampling point, and specifically comprising the following steps:
if the voltage value of the first sampling point or the voltage value of the second sampling point is equal to the voltage provided by the power supply unit, determining that a high-voltage interlocking detection port of the high-voltage connector is short-circuited with a power supply;
and if the voltage value of the first sampling point or the voltage value of the second sampling point is equal to 0, judging that the high-voltage interlocking detection port of the high-voltage connector is short-grounded.
2. The high voltage interlock detection method of claim 1, wherein after determining the connection status of the high voltage connector, the method further comprises:
and reporting the determined connection state of the high-voltage connector to a main control unit.
3. The high voltage interlock detection method of claim 1, wherein the first sampling path includes a first voltage dividing unit; the first voltage division unit is respectively connected with the first low-voltage connecting end and the pull-up resistor;
the second sampling path comprises a second voltage division unit; the second voltage division unit is respectively connected with the second low-voltage connecting end and the pull-down resistor.
4. The high-voltage interlock detection method according to claim 1 or 3, wherein the first sampling point is a connection point of the first sampling path and the first low-voltage connection terminal; the second sampling point is a connection point of the second sampling path and the second low-voltage connection end.
5. The high-voltage interlock detection method according to claim 3, wherein the first voltage dividing unit comprises a first voltage dividing resistor and a second voltage dividing resistor connected in series; the first sampling point is a connection point between the first voltage-dividing resistor and the second voltage-dividing resistor;
the second voltage division unit comprises a third voltage division resistor and a fourth voltage division resistor which are connected in series; the second sampling point is a connection point between the third voltage dividing resistor and the fourth voltage dividing resistor.
6. The method according to claim 3, wherein the pull-up resistor and the pull-down resistor are both kilo-ohm resistors;
the resistance value of the second voltage division unit is at least one order of magnitude higher than that of the pull-down resistor.
7. A high-voltage interlocking detection system is characterized by comprising a high-voltage box and at least one electric box; the high-voltage box and the electric box form a loop; the high voltage box and each of the electrical boxes include therein a high voltage interlock detection circuit as claimed in any one of claims 1 to 6.
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| CN112882456B (en) * | 2021-01-13 | 2022-04-12 | 深圳市道通科技股份有限公司 | OBD equipment |
| CN112977068A (en) * | 2021-03-18 | 2021-06-18 | 奇瑞新能源汽车股份有限公司 | High-voltage protection method and device for electric automobile and electric automobile |
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| DE102015211232A1 (en) * | 2015-06-18 | 2016-12-22 | Robert Bosch Gmbh | Method and circuit for detecting an open line of the sine / cosine receiver coil of a resolver |
| CN105403784B (en) * | 2015-11-16 | 2018-06-01 | 安徽江淮汽车集团股份有限公司 | A kind of new-energy automobile high-voltage interlocking detecting system |
| CN107976630A (en) * | 2016-10-23 | 2018-05-01 | 重庆邮电大学 | A kind of battery assembly system intelligent measurement platform |
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Effective date of registration: 20220117 Address after: 352100 science and technology building, No. 2, Xingang Road, Zhangwan Town, Jiaocheng District, Ningde City, Fujian Province Patentee after: Ningde Shidai Runzhi Software Technology Co.,Ltd. Address before: 352100 Xingang Road, Zhangwan Town, Jiaocheng District, Ningde, Fujian 2 Patentee before: Contemporary Amperex Technology Co.,Ltd. |