KR102672600B1 - Disconnection detection system of permanent power supply line and method for detecting disconnection of permanent power supply line using the same - Google Patents

Abstract

The present invention provides a disconnection detection system for a constant power supply line that can secure the reaction time to transition to a fail safe mode when an abnormal situation occurs and the vehicle's constant power supply line is disconnected, and a constant power supply line using the same. Regarding a method for detecting disconnection of a power supply line, the system according to an embodiment of the present invention includes a constant power supply line that is always connected to a battery mounted on a vehicle; An emergency power supply line connected to or disconnected from the battery through a main relay; an emergency driving load connected to the emergency power supply line to receive power from the battery only when the main relay is turned on; a freewheeling diode connected to the emergency drive load to freewheel energy stored in the emergency drive load when power supply to the emergency drive load is cut off; a voltage measuring unit that measures voltages of a first node on the regular power supply line and a second node on the non-continuous power supply line; and a control unit connected to the first node and operating with power supplied from the regular power supply line, and detecting disconnection of the regular power supply line, wherein the freewheeling diode is configured to detect disconnection in the regular power supply line. When freewheeling, it can be connected to the constant power supply line.

Description

Disconnection detection system of permanent power supply line and method for detecting disconnection of permanent power supply line using the same}

The present invention relates to a system for detecting disconnection in a constant power supply line and a method for detecting disconnection in a constant power supply line using the same. More specifically, a disconnection detection system for the constant power supply line that can secure the reaction time to transition to a fail safe mode when an abnormal situation occurs and the vehicle's constant power supply line is disconnected, and a disconnection detection system using the same. This relates to a method for detecting disconnection of a constant power supply line.

Figure 1 shows an existing system that detects disconnection of a constant power supply line.

Referring to FIG. 1, when the fuse 17 is blown or the wire of the constant power supply line 11 is broken due to an abnormal situation, the controller cannot operate due to the unavailability of constant power supply. When the controller becomes inoperable, the main relay 15 controlled by the controller is turned off, and the load 41, which was supplied with power through the main relay 15, is blocked from receiving power from the battery 10. and the operation stops.

As such, in the past, as soon as a disconnection occurred in the constant power supply line, the controller stopped and the main relay 15 was turned off. Therefore, it was difficult to secure the reaction time to transition the vehicle to the fail safe mode. there was.

The present invention provides a disconnection detection system for a constant power supply line that can secure the reaction time to transition to a fail safe mode when an abnormal situation occurs and the vehicle's constant power supply line is disconnected, and a constant power supply line using the same. The purpose is to provide a method for detecting disconnection of a power supply line.

A system for detecting disconnection of a constant power supply line according to an embodiment of the present invention for achieving the above-described object includes: a constant power supply line that is always connected to a battery mounted on a vehicle; An emergency power supply line connected to or disconnected from the battery through a main relay; an emergency driving load connected to the emergency power supply line to receive power from the battery only when the main relay is turned on; a freewheeling diode connected to the emergency drive load to freewheel energy stored in the emergency drive load when power supply to the emergency drive load is cut off; a voltage measuring unit that measures voltages of a first node on the regular power supply line and a second node on the non-continuous power supply line; and a control unit connected to the first node and operating with power supplied from the constant power supply line, and detecting disconnection of the constant power supply line.

Here, the freewheeling diode is connected to be freewheeled to the regular power supply line when a disconnection occurs in the regular power supply line.

At this time, the anode of the freewheeling diode may be connected to the emergency driving load, and the cathode of the freewheeling diode may be connected to the regular power supply line.

At this time, the control unit receives the voltage of the first node and the voltage of the second node from the voltage measuring unit, compares the magnitude, and detects disconnection of the constant power supply line based on the result of the comparison. You can.

Additionally, when detecting the occurrence of a disconnection, the control unit may transition the vehicle to a safe state so that preset fail safe control can be performed.

In addition, the control unit receives the voltage of the first node and the voltage of the second node from the voltage measurement unit, compares the magnitude, and determines that an abnormal state is present from the point when the following equation is satisfied as a result of the comparison. And the duration of the abnormal state can be counted.

[Equation]

(Here, V _VBD is the voltage of the first node, V _VBRD is the voltage of the second node, and V _TH is the size of the threshold voltage for determining the abnormal state)

In addition, the control unit may determine that a disconnection has occurred in the regular power supply line when the duration is greater than a preset reference diagnosis time.

Additionally, if Equation 1 is satisfied as a result of the comparison, the control unit may control to turn off at least one continuously driven load connected to the constant power supply line.

An embodiment of the present invention for achieving the above-described object includes a regular power supply line that is always connected to a battery mounted on a vehicle, an emergency power supply line that is connected to or disconnected from the battery through a main relay, and the main relay. An emergency driving load connected to the emergency power supply line to receive power from the battery only during the on operation, and the energy stored in the emergency driving load when the power supply to the emergency driving load is cut off. A method of detecting disconnection of a regular power supply line performed by a system including a freewheeling diode freewheeling to a regular power supply line, wherein the voltage of a first node on the regular power supply line and a second node on the non-constant power supply line measuring each; and comparing the voltage of the first node and the voltage of the second node and detecting a disconnection of the constant power supply line based on the result of the comparison.

Here, in the system, the anode of the freewheeling diode may be connected to the emergency driving load, and the cathode of the freewheeling diode may be connected to the regular power supply line.

At this time, after the step of detecting the occurrence of a disconnection, when the occurrence of a disconnection is detected, the step of transitioning the vehicle to a safe state so that a preset fail safe control can be performed is further included. can do.

In addition, the step of detecting the occurrence of a disconnection involves receiving the voltage of the first node and the voltage of the second node, comparing their sizes, and determining that an abnormal state is present from the point when the following equation is satisfied as a result of the comparison. And the duration of the abnormal state can be counted.

[Equation]

(Here, V _VBD is the voltage of the first node, V _VBRD is the voltage of the second node, and V _TH is the size of the threshold voltage for determining the abnormal state).

Additionally, in the step of detecting the occurrence of a disconnection, if the duration is greater than a preset reference diagnosis time, the occurrence of a disconnection in the regular power supply line may be confirmed.

Additionally, in the step of detecting the occurrence of a disconnection, if Equation 2 is satisfied as a result of the comparison, at least one continuously driven load connected to the constant power supply line may be controlled to turn off.

According to the present invention, when an abnormal situation occurs and the vehicle's constant power supply line is disconnected, the freewheeling diode is freewheeled to the constant power supply line, thereby securing reaction time for transitioning to the fail safe mode. You can.

Figure 1 shows an existing system that detects disconnection of a constant power supply line.
Figure 2 is a conceptual diagram of a system for detecting disconnection of a constant power supply line according to an embodiment of the present invention.
FIG. 3 is a diagram for explaining an embodiment of turning off some of a plurality of loads in the system of FIG. 2.
FIG. 4 illustrates the response time between a disconnection occurrence and transition to a fail safe mode in the system of FIG. 2.
Figure 5 is a flowchart showing the flow of a method for detecting disconnection of a constant power supply line according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. This is not intended to limit the present invention to specific embodiments, and should be interpreted as including all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

In describing the present invention, terms such as first and second may be used to describe various components, but the components may not be limited by the terms. The above terms are solely for the purpose of distinguishing one component from another. For example, a first component may be named a second component without departing from the scope of the present invention, and similarly, the second component may also be named a first component.

The term “and/or” may include any of a plurality of related stated items or a combination of a plurality of related stated items.

When a component is said to be "connected" or "connected" to another component, it means that it may be directly connected to or connected to that other component, but that other components may also exist in between. It can be understood. On the other hand, when a component is referred to as being “directly connected” or “directly connected” to another component, it can be understood that there are no other components in between.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions may include plural expressions, unless the context clearly indicates otherwise.

In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and one or more other features It can be understood that it does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries can be interpreted as having meanings consistent with the meanings they have in the context of related technologies, and unless clearly defined in this application, are interpreted as having an ideal or excessively formal meaning. It may not work.

In addition, the following examples are provided to provide a more complete explanation to those with average knowledge in the art, and the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation.

Figure 2 is a conceptual diagram of a system for detecting disconnection of a constant power supply line according to an embodiment of the present invention.

Referring to FIG. 2, the disconnection detection system of the constant power supply line according to an embodiment of the present invention includes a constant power supply line 11 that is always connected to the battery 10 mounted on the vehicle, and a main relay 15. It includes an emergency power supply line (13) that is connected to or disconnected from the battery (10) through.

The constant power supply line 11 may supply power provided from the battery 10 to the control unit 400 through the power supply unit 100. A fuse switch 17 may be placed on the constant power supply line 11.

As is known, a vehicle may include multiple loads driven for various functions. A plurality of loads can be divided into an emergency drive load 41 and a regular drive load 45 and 47 depending on the path through which power is supplied. The load may be, for example, a drive motor, air conditioning device, navigation, black box, etc. Each load must be connected to the battery 10 to receive driving power, and depending on its function, it can be connected to either the regular power supply line 11 or the emergency power supply line 13. For example, the drive motor and the air conditioner, which are the emergency drive load 41, may be connected to the emergency power supply line 13 so that they receive power only when the main relay 15 is turned on. For example, the black box, which is a constant driving load 45 or 47, may be connected to the constant power supply line 11 so that it can operate by receiving power from the battery 10 even when the vehicle is stopped or parked.

The system for detecting disconnection of a constant power supply line according to an embodiment of the present invention may further include a freewheeling diode 300. The freewheeling diode 300 may be electrically connected to the emergency drive load 41 to freewheel the energy stored in the emergency drive load 41 when the power supply to the emergency drive load 41 is cut off.

The system for detecting disconnection of the regular power supply line according to an embodiment of the present invention further includes a voltage measurement unit 200 that is connected to the regular power supply line 11 and the emergency power supply line 13 to measure the voltage. can do.

More specifically, the voltage measurement unit 200 is connected to the first node (VBD) on the constant power supply line 11 and can measure the voltage of the first node (VBD). The voltage measuring unit 200 is connected to the second node (VBRD) on the emergency power supply line 13 and can measure the voltage of the second node (VBRD). The voltage measurement unit 200 may include an analog to digital converter (ADC) circuit to receive an analog voltage and measure it as a digital value.

At this time, the first node (VBD) is defined as a point downstream of the diode (D1) provided in the regular power supply line 11, and the second node (VBRD) is defined as the diode (D2) provided in the emergency power supply line 13. ) is defined as the point after the point. The diodes D1 and D2 are devices that allow current to flow only from the outside to the inside of the controller including the power supply unit 100, the voltage measurement unit 200, and the control unit 400. The first node (VBD) and the second node (VBRD) may be one point of a circuit line included within the controller.

The voltage measurement unit 200 may transmit the voltage of the first node (VBD) and the voltage of the second node (VBRD) measured by the voltage measurement unit 200 to the control unit 400, which will be described later. In a normal operation state, the voltage of the first node (VBD) and the voltage of the second node (VBRD) measured will be the same or have a difference smaller than a preset threshold voltage.

The system for detecting disconnection of a constant power supply line according to an embodiment of the present invention may further include a control unit 400.

The control unit 400 is connected to the first node (VBD) and may operate with power supplied from the constant power supply line 11. More specifically, the control unit 400 may receive power from the battery 10 through the power unit 100.

At this time, the power unit 100 is configured to vary the power provided from the battery 10 to suit each element in the controller. For example, the power supply unit 100 may include a boost-buck circuit to step down or step up the voltage of the battery 10.

The power supply unit 100 may include a plurality of output terminals that output voltage and current tailored to each type of power in response to various types of power required by various elements of the controller. The plurality of output terminals may include an output terminal using the first node (VBD) as a power source and an output terminal using the second node (VBRD) as a power source.

The control unit 400 can detect disconnection of the constant power supply line 11. More specifically, the control unit 400 may receive the voltage of the first node (VBD) and the voltage of the second node (VBRD) from the voltage measurement unit 200 and compare their sizes.

In an embodiment of the present invention, the control unit 400 may include or be one of various controllers that can perform operations by executing computer program instructions, such as a CPU, MCU, microcontroller, or microprocessor.

As described above, in a normal driving state, the difference between the voltage of the first node (VBD) and the voltage of the second node (VBRD) is smaller than the preset threshold voltage, but there is a disconnection in the constant power supply line 11. In a fault detection state, the difference between the voltage of the first node (VBD) and the voltage of the second node (VBRD) becomes greater than the threshold voltage. Accordingly, the control unit 400 can detect and determine the occurrence of disconnection in the constant power supply line 11 based on the result of the comparison.

At this time, when detecting the occurrence of a disconnection, the control unit 400 may transition the state of the vehicle to a safe state so that preset fail safe control can be performed. The safety state is a state in contrast to the normal driving state, and the preset fail-safe control may be, for example, control to Limp Home Mode. In Limp Home Mode, some functions of the vehicle are restricted for the safety of passengers, such as the engine speed not rising above a certain rpm or the transmission being locked. In a safe state, a warning may be displayed so that the vehicle operator can recognize a controller abnormality and take the vehicle to a repair shop. The control unit 400 can display the warning by sending information to the vehicle cluster through CAN communication and turning on the LED.

Meanwhile, the control unit 400 can control the operations of the plurality of loads 41, 45, and 47 described above. To this end, the control unit 400 may transmit control signals to the driving circuits 510, 520, and 530 that drive the plurality of loads 41, 45, and 47. The control signal may be a signal that turns on or off the operation of the plurality of loads 41, 45, and 47 described above. In a possible embodiment, the driving circuits 510, 520, and 530 may be included in the control unit 400. In another possible embodiment, the driving circuits 510, 520, and 530 may be provided separately from the control unit 400. In another possible embodiment, the driving circuits 510, 520, and 530 are components of a power complex semiconductor and may be provided as a single module together with the power supply unit 100.

Referring back to Figure 1, in the existing system, the anode of the freewheeling diode 42 is connected to the non-continuous driving load 41, and the cathode also supplies emergency power along with the non-continuous driving load 41. It is connected to line (13).

At this time, when the driving of the emergency driving load 41 is stopped, the freewheeling diode 42 connected to the emergency power supply line 13 along with the emergency driving load 41 is connected to the emergency power supply line 13. ) or is configured to clamp a surge voltage above a certain voltage to the Zener diode (43) through the Zener diode (43).

In contrast, in an embodiment of the present invention, the anode of the freewheeling diode 300 is connected to the emergency driving load 41, and the cathode of the freewheeling diode 300 may be connected to the regular power supply line 11. . That is, the anode of the freewheeling diode 300 is connected to the emergency driving load 41 as before, but the cathode is separated from the emergency driving load 41 and connected to the regular power supply line 11.

In other words, the freewheeling diode 300 is connected so as to be freewheeled to the regular power supply line 11 when a disconnection occurs in the regular power supply line 11, and the non-continuous driving load 41 is connected to the regular power supply line 11. ) supplies energy.

To explain from another perspective, in the system proposed in the present invention, the current path connected to the emergency power supply line 13, the emergency driving load 41, the freewheeling diode 300, and the constant power supply line 11 is Consists of. In a normal driving state, no current flows through the current path, and current flows by freewheeling only when a disconnection occurs in the constant power supply line 11.

Therefore, even if the regular power supply line 11 is disconnected, the main relay 15 is not turned off due to the freewheeling current supplied to the first node (VBD) for a certain period of time, unlike before. Therefore, the controller can also be driven without problems. The system disclosed in the present invention can detect that a disconnection has occurred during the secured predetermined time (reaction time), confirm the diagnosis, and perform a series of controls to transition the vehicle to a safe driving state.

To explain this, it is as follows.

The control unit 400 compares the magnitude of the voltage of the first node (VBD) and the voltage of the second node (VBRD) received from the voltage measurement unit 200. As a result of the above comparison, it can be determined that the controller is in an abnormal state from the point where Equation 1 below is satisfied.

[Equation 1]

Here, V _VBD is the voltage of the first node, V _VBRD is the voltage of the second node, and V _TH means the size of the threshold voltage for determining the abnormal state.

At this time, the control unit 400 may count the duration from the time the abnormal state is determined until the abnormal state continues. If the duration is greater than the preset reference diagnosis time, the control unit 400 may determine that a disconnection of the regular power supply line 11 has occurred. Here, the counting of the duration occurs when a difference greater than the threshold voltage occurs between the voltage of the first node (VBD) and the voltage of the second node (VBRD) due to electrical noise of an unknown cause and then returns to normal. This is to exclude it from confirming the diagnosis.

The reference diagnosis time is a preset and stored value and can be set based on sufficient experiments and data to exclude the above-mentioned noise situation from confirming the diagnosis.

In this way, a standard diagnosis time can be set and the diagnosis of disconnection can be confirmed only in cases where the duration of the abnormal state exceeds it. In addition, the system according to the embodiment of the present invention can confirm the diagnosis of disconnection. This is possible because sufficient time is secured. That is, by securing the reaction time in the system according to the embodiment of the present invention, the reliability of determining the occurrence of a disconnection can also be improved.

FIG. 3 is a diagram for explaining an embodiment of turning off some of a plurality of loads in the system of FIG. 2.

Referring to FIG. 3, as a possible embodiment, the control unit 400 compares the magnitude of the voltage of the first node (VBD) and the voltage of the second node (VBRD), and when Equation 1 is satisfied, the constant power At least one continuously driven load (45, 47) connected to the supply line (11) can be controlled to turn off. This can be implemented by the control unit 400 transmitting an off control signal to the driving circuits 520 and 530 connected to at least one of the constantly driving loads 45 and 47. That is, the control unit 400 maintains an on control signal for some of the always-driving loads 45 and 47 and transmits an off control signal for some, thereby minimizing the number of loads that consume freewheeling power.

At this time, it is preferable that the constant driving loads 45 and 47 that are turned off are non-essential driving loads rather than essential driving loads. Non-essential drive loads can be defined as loads that do not affect the safe operation of the vehicle. For example, a non-essential drive load may be a black box. If the amount of power consumed by non-essential loads is reduced from the freewheeling power source, a longer response time can be secured for detecting the occurrence of a disconnection and transitioning to safe operation.

FIG. 4 illustrates the response time between a disconnection occurrence and transition to a fail safe mode in the system of FIG. 2.

Referring to Figure 4, case 1 shows the reaction time when essential drive loads and non-essential drive loads are not controlled separately, and case 2 shows only essential drive loads as soon as an abnormal condition is detected and non-essential drive loads are turned on. This shows the reaction time when the load is controlled to be turned off. As described above, it can be seen that a longer reaction time can be secured in case 2.

Figure 5 is a flowchart showing the flow of a method for detecting disconnection of a constant power supply line according to an embodiment of the present invention.

The method for detecting disconnection of a constant power supply line according to an embodiment of the present invention can be performed by the above-described disconnection detection system of the constant power supply line.

The method for detecting disconnection of the regular power supply line 11 according to an embodiment of the present invention is, first, the first node (VBD) on the regular power supply line 11 and the second node on the emergency power supply line 13 ( The step of measuring each voltage of VBRD) is performed.

More specifically, in this step, the voltage measurement unit 200 is connected to the first node (VBD) on the constant power supply line 11 and can measure the voltage of the first node (VBD). In this step, the voltage measuring unit 200 is connected to the second node (VBRD) on the emergency power supply line 13 and can measure the voltage of the second node (VBRD).

After measuring the voltage of each node, the voltage measurement unit 200 may transmit the measured voltage of the first node (VBD) and the voltage of the second node (VBRD) to the control unit 400, which will be described later. In a normal operation state, the voltage of the first node (VBD) and the voltage of the second node (VBRD) measured will be the same or have a difference smaller than a preset threshold voltage. In a state where a disconnection occurs in the constant power supply line 11 (fault detection), the difference between the voltage of the first node (VBD) and the voltage of the second node (VBRD) will become greater than the threshold voltage.

Next, a step of detecting the occurrence of a disconnection of the constant power supply line 11 is performed based on the result of comparing the voltage of the first node (VBD) and the voltage of the second node (VBRD).

More specifically, in this step, the control unit 400 receives the voltage of the first node (VBD) and the voltage of the second node (VBRD), compares the magnitude, and determines whether Equation 1 is satisfied as a result of the comparison. You can judge. (S210)

If Equation 1 is satisfied, it is determined that the abnormal state is in an abnormal state from the time Equation 1 is satisfied, and the duration of the abnormal state can be counted (S220).

At this time, the control unit 400 may monitor whether the duration time becomes greater than the preset reference diagnosis time (S230). If the duration time becomes greater than the preset standard diagnosis time as a result of the monitoring, the constant power supply line (S230) The occurrence of disconnection in 11) can be confirmed (S240).

In this way, by setting a standard diagnosis time and confirming that a disconnection occurs only when it is exceeded, errors in which a state abnormality is detected and confirmed due to simple noise can be excluded.

Meanwhile, in this step, the control unit 400 counts the duration when Equation 1 is satisfied as a result of comparing the magnitude of the voltage of the first node (VBD) and the voltage of the second node (VBRD). At the same time, at least one constantly driving load 45 or 47 connected to the constant power supply line 11 can be controlled to turn off. This can be implemented by the control unit 400 transmitting an off control signal to the driving circuits 520 and 530 connected to at least one of the constantly driving loads 45 and 47. That is, the control unit 400 can minimize the number of loads that consume freewheeling power by maintaining on control signals for some of the always-driving loads 45 and 47 and transmitting off control signals to some of them.

The method for detecting a disconnection in the constant power supply line 11 according to an embodiment of the present invention may further perform a step of transitioning the vehicle to a safe state after detecting a disconnection (S200). (S300)

If the vehicle transitions to a safe state in this step, preset fail-safe control can be performed. The preset fail-safe control may be, for example, control to Limp Home Mode. In a safe state, a warning can be displayed on the cluster so that the vehicle operator can recognize the controller abnormality and take the vehicle to the repair shop.

As described above, according to the present invention, when an abnormal situation occurs and the vehicle's constant power supply line is disconnected, the freewheeling diode is freewheeled to the constant power supply line, thereby enabling transition to the fail safe mode. Reaction time can be secured.

Meanwhile, although the present invention has been described with limited embodiments and drawings, the present invention is not limited to the above embodiments, and various modifications and variations can be made by those skilled in the art from these descriptions. do. Therefore, the technical idea of the present invention should be understood only by the claims, and all equivalent or equivalent modifications thereof shall fall within the scope of the technical idea of the present invention.

10: battery
11: Constant power supply line
13: Emergency power supply line
15: main relay
17: fuse
41: Emergency driving load
45, 47: Always running load
100: power unit
200: Voltage measurement unit
300: Freewheeling diode
400: Control unit
510,520,530: Driving circuit

Claims (13)

A constant power supply line that is always connected to the battery installed in the vehicle;
An emergency power supply line connected to or disconnected from the battery through a main relay;
an emergency driving load connected to the emergency power supply line to receive power from the battery only when the main relay is turned on;
a voltage measuring unit that measures voltages of a first node on the regular power supply line and a second node on the non-continuous power supply line;
a control unit connected to the first node, operating with power supplied from a constant power supply line, and detecting disconnection of the constant power supply line; and
When a disconnection occurs in the regular power supply line, a freewheeling diode connected to the emergency drive load and the regular power supply line so that the energy stored in the emergency drive load is freewheeled to the power supply line,
Disconnection detection system in the constant power supply line.
According to paragraph 1,
The anode of the freewheeling diode is connected to the emergency driving load,
Characterized in that the cathode of the freewheeling diode is connected to the constant power supply line,
Disconnection detection system in the constant power supply line.
According to paragraph 1,
The control unit,
Characterized in that receiving the voltage of the first node and the voltage of the second node from the voltage measuring unit, comparing their sizes, and detecting disconnection of the constant power supply line based on the result of the comparison,
Disconnection detection system in the constant power supply line.
According to paragraph 3,
The control unit,
When detecting the occurrence of the disconnection, the vehicle is transitioned to a safe state so that preset fail safe control can be performed,
Disconnection detection system in the constant power supply line.
According to paragraph 1,
The control unit,
Receive the voltage of the first node and the voltage of the second node from the voltage measuring unit and compare their sizes,
As a result of the comparison, it is determined that the abnormal state is in an abnormal state from the time when the following equation 1 is satisfied, and the duration of the abnormal state is counted,
Disconnection detection system in the constant power supply line.
[Equation 1]

(Here, V _VBD is the voltage of the first node, V _VBRD is the voltage of the second node, and V _TH is the size of the threshold voltage for determining the abnormal state)
According to clause 5,
The control unit,
Characterized in confirming the occurrence of disconnection of the constant power supply line when the duration is greater than the preset reference diagnosis time,
Disconnection detection system in the constant power supply line.
According to clause 5,
The control unit,
As a result of the comparison, if Equation 1 is satisfied, at least one continuously driven load connected to the constant power supply line is controlled to be turned off.
Disconnection detection system in the constant power supply line.
A regular power supply line that is always connected to the battery installed in the vehicle, an emergency power supply line that is connected to or disconnected from the battery through a main relay, and a power supply line that receives power from the battery only when the main relay is turned on. An emergency driving load connected to an emergency power supply line, and the non-continuous driving load and the regular power supply so that when a disconnection occurs in the regular power supply line, the energy stored in the emergency driving load is freewheeled to the regular power supply line. A method of detecting a disconnection in a constant power supply line performed by a system including a freewheeling diode connected to the supply line, comprising:
measuring voltages of a first node on the regular power supply line and a second node on the non-continuous power supply line; and
Comprising the voltage of the first node and the voltage of the second node and detecting a disconnection of the constant power supply line based on the result of the comparison.
Method for detecting disconnection in a constant power supply line.
According to clause 8,
The system is,
The anode of the freewheeling diode is connected to the emergency driving load,
Characterized in that the cathode of the freewheeling diode is connected to the constant power supply line,
Method for detecting disconnection in a constant power supply line.
According to clause 8,
After the step of detecting the occurrence of disconnection,
When detecting the occurrence of the disconnection, further comprising transitioning the vehicle to a safe state so that preset fail safe control can be performed,
Method for detecting disconnection in a constant power supply line.
According to clause 8,
The step of detecting the occurrence of a disconnection is,
Receive the voltage of the first node and the voltage of the second node and compare their sizes,
As a result of the comparison, it is determined that the abnormal state is in an abnormal state from the time when the following equation 2 is satisfied, and the duration of the abnormal state is counted,
Method for detecting disconnection in a constant power supply line.
[Equation 2]

(Here, V _VBD is the voltage of the first node, V _VBRD is the voltage of the second node, and V _TH is the size of the threshold voltage for determining the abnormal state).
According to clause 11,
The step of detecting the occurrence of a disconnection is,
Characterized in confirming the occurrence of disconnection of the constant power supply line when the duration is greater than the preset reference diagnosis time,
Method for detecting disconnection in a constant power supply line.
According to clause 11,
The step of detecting the occurrence of a disconnection is,
As a result of the comparison, if Equation 2 is satisfied, at least one continuously driven load connected to the constant power supply line is controlled to be turned off.
Method for detecting disconnection in a constant power supply line.

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