KR20170024818A - Apparatus for diagnosing state of control line - Google Patents

Apparatus for diagnosing state of control line Download PDF

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Publication number
KR20170024818A
KR20170024818A KR1020150120326A KR20150120326A KR20170024818A KR 20170024818 A KR20170024818 A KR 20170024818A KR 1020150120326 A KR1020150120326 A KR 1020150120326A KR 20150120326 A KR20150120326 A KR 20150120326A KR 20170024818 A KR20170024818 A KR 20170024818A
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South Korea
Prior art keywords
node
control line
diagnostic
potential
switch
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KR1020150120326A
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Korean (ko)
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KR102050529B1 (en
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김우중
김태윤
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주식회사 엘지화학
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • 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
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R31/021—
    • 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
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The present invention discloses an apparatus that can accurately diagnose the state of a control line while providing an apparatus that can diagnose the state of a control line of a driving load at a relatively low cost. The control line diagnostic apparatus according to an embodiment of the present invention is a drive circuit for driving a drive load by flowing a current from a first high potential node to a first low potential node through a control line when a drive switch is turned on, An apparatus for diagnosing a control line of a drive circuit in which a potential of a drive switch is higher than a potential of the drive load, the apparatus comprising: a first node connected to a first node formed on the control line; A first diagnostic line having a first resistor, a second resistor and a first diode connected in series; A second diagnostic line having one end connected to the first node and the other end connected to a second low potential node, and having a third resistor; A voltage measuring unit measuring a voltage of a second node formed between the first resistor and the second resistor; And a control unit for controlling the drive switch to set a predetermined operation mode and diagnosing the state of the control line using the voltage value of the second node measured by the voltage measurement unit in the set operation mode, The first diode may be provided in the first diagnostic line to allow the flow of current from the second high-potential node to the first node.

Description

[0001] Apparatus for diagnosing a control line [0002]

The present invention relates to a technique for diagnosing the state of a control line that selectively controls the driving of a driving load by conducting a current, and more particularly, to a control line for diagnosing various fault conditions that may occur in the control line Diagnostic apparatus.

An electric appliance widely used in real life or the like is configured to be driven in accordance with conduction of electric current when current flows through the control line. For example, a relay (relay) may be configured to close an electric circuit when a current flows through a control line provided in the relay, and to open the electric circuit when no current flows through the control line do. However, if the control line is short-circuited or disconnected for some reason, the flow of current through the control line becomes stuck and the driving load can not be controlled.

As a more specific example, a relay used in an electric vehicle is a representative example. BACKGROUND OF THE INVENTION [0002] Electric vehicles, which have recently become increasingly interested in the world, have relays to control the electrical connection between the secondary battery and the electric motor. The relay is controlled by a control system of the electric vehicle, and the control system has a self-diagnosis function for diagnosing the state of the relay control line. However, the self-diagnosis function provided in the control system is performed by additionally providing a current sensing circuit to determine whether a current flows through the control line, or by separately providing an expensive element. Nowadays, there is an increasing demand to relocate the relay control function to the BMS. There is an increasing need for the BMS to diagnose the relay control line itself in response to the request. In order to enable the BMS to diagnose the status of the relay control line itself, a relatively inexpensive and compact diagnostic device is needed.

The Applicant has recognized the need for a device that can diagnose the condition of the control line at a relatively low cost. An object of the present invention is to provide an apparatus that can accurately diagnose the state of a control line while providing an apparatus capable of diagnosing the state of a control line of a driving load at a relatively low cost,

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It is also to be understood that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations thereof.

According to an aspect of the present invention, there is provided a control line diagnostic apparatus comprising: a control line drive circuit that drives a drive load through a control line when a drive switch is turned on and a current flows from a first high potential node to a first low potential node An apparatus for diagnosing a control line of a drive circuit in which a potential of the drive switch is higher than a potential of the drive load, the apparatus comprising: a first node connected to a first node formed on the control line, A first diagnostic line coupled to the node and having a first resistor, a second resistor and a first diode connected in series; A second diagnostic line having one end connected to the first node and the other end connected to a second low potential node, and having a third resistor; A voltage measuring unit measuring a voltage of a second node formed between the first resistor and the second resistor; And a control unit for controlling the drive switch to set a predetermined operation mode and diagnosing the state of the control line using the voltage value of the second node measured by the voltage measurement unit in the set operation mode, The first diode may be provided in the first diagnostic line to allow the flow of current from the second high-potential node to the first node.

The control unit records the voltage value of the second node measured in the operation mode in which the drive switch is turned on and the voltage value of the second node measured in the operation mode in which the drive switch is turned off in a pre- The state of the control line can be diagnosed.

The state of the control line includes a high-potential short-circuit state in which the control line is short-circuited with the first high-potential node, a low-potential short-circuit state in which the control line is short-circuited with the first low- State and a steady state.

The first diagnostic line may further include a first diagnostic switch that is selectively turned on or off, and the control unit may control the first diagnostic switch to be turned on to diagnose the control line.

The second diagnostic line may further comprise a second diagnostic switch that is selectively turned on or off, and the control unit may control the second diagnostic switch to be turned on to diagnose the control line.

The first low potential node and the second low potential node may be connected to ground.

The potential of the second high potential node may be lower than or equal to the potential of the first high potential node.

And may be a relay for the driving unit.

In order to achieve the above object, a BMS (Battery Management System) according to another aspect of the present invention may include the control line diagnostic apparatus.

According to still another aspect of the present invention, a battery pack includes the control line diagnostic apparatus.

According to an aspect of the present invention, it is possible to provide an apparatus that can accurately diagnose the state of a control line while diagnosing the state of the control line of the drive load at a relatively low cost.

In addition, the present invention can have various other effects, and other effects of the present invention can be understood by the following description, and can be more clearly understood by the embodiments of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention. And should not be construed as limiting.
1 is a diagram schematically showing a configuration of a control line diagnostic apparatus according to an embodiment of the present invention.
Figs. 2 to 5 are views showing four states of control lines provided in the driving circuit, respectively.
6 to 9 are diagrams showing four states in which the control line can be placed in an operation mode in which the drive switch is turned on.
Figures 10-13 illustrate four states in which the control line may be placed in an operating mode in which the drive switch is turned off.
14 is a diagram showing a diagnosis table according to an embodiment of the present invention.
15 is a view schematically showing the configuration of a control line diagnostic apparatus according to another embodiment of the present invention.
16 is a diagram schematically showing a configuration of a control line diagnostic apparatus according to another embodiment of the present invention.
17 is a diagram schematically showing a configuration of a control line diagnostic apparatus according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be construed as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Throughout the specification, when an element is referred to as including an element, it does not exclude other elements unless specifically stated to the contrary, it may include other elements. Also, the term "control unit" as described in the specification means a unit for processing at least one function or operation, which may be implemented by hardware, software, or a combination of hardware and software.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' .

1 is a diagram schematically showing a configuration of a control line diagnostic apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a control line diagnostic apparatus 200 according to an embodiment of the present invention diagnoses the state of a control line 140 provided in a driving circuit 100. In the embodiment of FIG. 1, the control line diagnostic apparatus 200 diagnoses the state of the control line 140 of the relay 110 that electrically connects the battery pack 10 and the load. 1, the load is an electric motor 30, and the electric motor 30 and the battery pack 10 are electrically connected to each other with the inverter 20 interposed therebetween.

 The battery pack 10 includes at least one battery cell 1 and a battery management system (BMS).

The battery cell 1 may be an energy storage element, preferably a lithium secondary battery. However, the type of the battery cell 1 is not limited thereto. In addition, the battery cells 1 may be connected in series or in parallel and may be modularized. That is, the battery cells 1 may be connected in series or in parallel, and may be connected in series and in parallel. In the embodiment of FIG. 1, a plurality of battery cells 1 are connected in series in the battery cell 1, but the number and connection relationship of the battery cells 1 are not limited thereto.

The battery management system (BMS) monitors the state of each battery cell 1 and the overall state of the battery pack 10 and performs various control functions.

The driving circuit 100 includes a driving load 110, a first high potential node 120, a first low potential node 130, a control line 140, and a driving switch 150. 1, the driving circuit 100 is a circuit for driving the relay 110, and the driving load 110 is a relay 110. In the embodiment shown in FIG.

The control line 140 is connected between the driving load 110 and the driving switch 150 and provides a path through which the current can flow when the driving switch 150 is turned on.

The driving switch 150 may be a switching element connected to one end of the control line 140 and selectively turned on or off according to a control signal. The driving switch 150 may be implemented with various switching elements. According to one embodiment, the drive switch 150 may be implemented as a MOSFET. Preferably, the drive switch 150 receives a control signal from a control unit, which will be described later, and can be turned on or off.

The first high potential node 120 has a potential higher than that of the first low potential node 130 and is connected to the first high potential node 130 through the control line 140 when the drive switch 150 is turned on. 120) to the first low-potential node (130). The first high potential node 120 may have a potential higher than that of the first low potential node 130 by being connected to a power source V cc1 . According to one embodiment, the power source ( Vcc1 ) may be supplied from the battery pack (10).

The first low potential node 130 has a potential lower than that of the first high potential node 120 and is connected to the first high potential node 120 via the control line 140 when the driving switch 150 is turned on. 120) to the first low-potential node (130). Preferably, the first may be connected to the ground (GND1), a low potential node 130, having a potential lower than the power source (V cc1).

The driving load 110 is connected to the other end of the control line 140 and is configured to be driven when a current flows through the control line 140. In the embodiment of FIG. 1, the driving load 110 is a relay 110. When a current flows through the control line 140, the contacts are connected to make an electrical connection between the battery pack 10 and the load.

Meanwhile, the driving switch 150 is connected to the first high potential node 120 and the driving load 110 is connected to the first low potential node 130. That is, the potential of the driving switch 150 is higher than the potential of the driving load 110. As shown in FIG. 1, the drive switch 150 is provided between the first high-potential node 120 and the drive load 110 as a so-called high-side switch. The high side switch is distinguished from the low side switch provided between the first low potential node 130 and the driving load 110.

The driving circuit 100 described above is used as the relay driving circuit 100 and the control line 140 provided in the driving circuit 100 is used for driving the relay 110. However, And may be used to drive a driving circuit other than the relay 110. [ In other words, the driving circuit 100 disclosed in this specification can be applied not only to the relay 110 but also to a cooling fan, a cooling pump, etc. for cooling the battery, to be. Similarly, the control line diagnostic apparatus 200 to be described later can diagnose not only the control line 140 provided in the relay driving circuit 100 but also the state of the control line 140 provided in various other driving circuits .

The control line diagnostic apparatus 200 according to an embodiment of the present invention can diagnose the state of the control line 140 provided in the drive circuit 100 described above. The control line diagnostic apparatus 200 according to an embodiment of the present invention may include a first diagnostic line 210, a second diagnostic line 220, a voltage measurement unit 230, and a control unit.

The first diagnostic line 210 may be connected between the control line 140 and the second high potential node 211. More specifically, one end of the first diagnostic line 210 is connected to a first node N 1 formed on the control line 140, and the other end of the first diagnostic line 210 is connected to the second And may be connected to the upper node 211. The second high potential node 211 has a high potential as compared with the second low potential potential node 221 to be described later. According to an embodiment, the second high-potential node 211 may be connected to a power source V cc2 having a potential equal to or lower than the power source V cc1 . Here, the first node N 1 denotes an electric node formed between the driving load 110 and the driving switch 150.

A first resistor R 1 , a second resistor R 2 and a first diode D 1 may be provided on the first diagnostic line 210. The first resistor R 1 , the second resistor R 2 and the first diode D 1 may be connected in series with each other. Here, an electrical node formed between the first resistor R 1 and the second resistor R 2 may be referred to as a second node N 2 . The second node N 2 may be used as a node through which a voltage measuring unit 230, which will be described later, measures a voltage. The first diode D 1 is a device that conducts current in one direction, that is, a rectifying device. 1, the first diode D 1 allows current to flow from the second high-potential node 211 toward the first node N 1 , May be provided in the first diagnostic line 210 to block current flow.

The second diagnostic line 220 may be coupled between the control line 140 and the second low potential node 221. More specifically, one end of the second diagnostic line 220 may be coupled to the first node N 1 and the other end of the second diagnostic line 220 may be coupled to the second low potential node 221. have. The second low potential node 221 has a low potential as compared with the second high potential node 211. And a ground GND2 may be connected to the second low potential node 221. [ The ground GND2 connected to the second low potential node 221 may be a common ground with the ground GND1 connected to the first low potential node 130 and may be connected to the ground GND1 connected to the first low potential node 130 ) May be an independent ground.

The voltage measuring unit 230 may measure the voltage of the second node N 2 . According to one embodiment, the voltage measuring unit 230 may include a voltage sensor to measure the voltage of the second node N 2 (see FIG. 1). The voltage measuring unit 230 may transmit the measured voltage of the second node N 2 to a controller to be described later.

The control unit can control the switching operation of the driving switch 150. The control unit may control the switching operation of the driving switch 150 to set the operation mode. The control unit may diagnose the state of the control line 140 using the voltage value of the second node N 2 measured by the voltage measuring unit 230 in the set operation mode.

According to one embodiment, the controller turns on the driving switch 150 to turn on the second node N 2 measured by the voltage measuring unit 230 in the operation mode in which the driving switch 150 is turned on, And the voltage value of the second node N 2 measured by the voltage measuring unit 230 in the operation mode in which the drive switch 150 is turned off, The state of the control line 140 can be diagnosed. More specifically, the control unit determines whether the voltage value of the second node N 2 measured in the operation mode in which the drive switch 150 is turned on and the voltage value of the second node N 2 measured in the operation mode in which the drive switch 150 is turned off It is possible to diagnose the state of the control line 140 by comparing the voltage value of the second node N 2 with the value recorded in the previously prepared diagnosis table.

The control line 140 may be divided into a steady state and a fault state. The control line 140 may be divided into a high-potential short-circuit state in which the control line 140 is short-circuited with the first high- The control line 140 may be broken down into a low-potential short-circuit state in which the control line 140 is short-circuited with the first low-potential node 130, and the control line 140 is disconnected.

Figs. 2 to 5 are views showing four states of control lines provided in the driving circuit, respectively. Fig. 2 to Fig. 5 are diagrams showing the driving circuit of Fig. 1, each showing four states in which the control line can be placed.

Referring to Figure 2, a control line 140 in a steady state is shown (see arrow A). Referring to FIG. 3, a control line 140 in a disconnected state is shown (see arrow B). Referring to FIG. 4, a control line 140 is shown in the high potential short circuit state (see arrow C). Referring to FIG. 5, there is shown a control line 140 that is in a low-potential short-circuited state (see arrow D).

Hereinafter, a process of creating a diagnosis table according to an embodiment of the present invention will be described. Next, the process of diagnosing the state of the control line 140 by comparing the voltage value of the second node measured in the predetermined operation mode with the value recorded in the diagnosis table according to an embodiment of the present invention will be described.

First, a process of calculating the voltage of the second node in four states in which the control line can be placed in the operation mode in which the drive switch is turned on will be described.

6 to 9 are diagrams showing four states in which the control line can be placed in an operation mode in which the drive switch is turned on.

<When the drive switch is in the turned-on operation mode and the control line is in the normal state>

6, there is shown a state in which the drive switch 150 is in the turned on mode and the control line 140 is in the steady state (see arrow A). As shown, since the driving switch 150 is turned on, the voltage of the first node N 1 is equal to the voltage of the power source V cc1 connected to the first high potential node 120. The potential of the power source V cc2 connected to the second high potential node 211 is lower than the potential of the power source V cc1 connected to the first high potential node 120 and the first diode D 1 is connected to the second high- So that current can flow only in the direction from the high potential node 211 to the first node N 1 . Therefore, the voltage of the second node N 2 is equal to the voltage of the second high potential node 211. That is, the voltage of the second node N 2 is V cc2 .

&Lt; When the drive switch is turned on and the control line is disconnected >

7, a state in which the drive switch 150 is in the turned-on operation mode and the control line 140 is in the disconnected state (see arrow B) is shown. As shown, since the driving switch 150 is turned on, the voltage of the first node N 1 is equal to the voltage of the power source V cc1 connected to the first high potential node 120. The potential of the power source V cc2 connected to the second high potential node 211 is lower than the potential of the power source V cc1 connected to the first high potential node 120 and the first diode D 1 is connected to the second high- So that current can flow only in the direction from the high potential node 211 to the first node N 1 . Therefore, the voltage of the second node N 2 is equal to the voltage of the second high potential node 211. That is, the voltage of the second node N 2 is V cc2 . When the disconnection state is compared with the normal state, it is confirmed that the voltage of the second node N 2 is not affected although there is a difference that the control line 140 is disconnected.

&Lt; When the drive switch is in the turned-on operation mode and the control line is in the high-

Next, referring to FIG. 8, a state in which the driving switch 150 is in the turned-on operation mode and the control line 140 is in the high-potential short-circuited state (see arrow C) is shown. As shown, since the driving switch 150 is turned on and the first high-potential node 120 and the control line 140 are short-circuited, the voltage of the first node N 1 is lower than the voltage of the first high- Is equal to the voltage of the power source ( Vcc1 ) connected to the power source (120). The potential of the power source V cc2 connected to the second high potential node 211 is lower than the potential of the power source V cc1 connected to the first high potential node 120 and the first diode D 1 is connected to the second high- So that current can flow only in the direction from the high potential node 211 to the first node N 1 . Therefore, the voltage of the second node N 2 is equal to the voltage of the second high potential node 211. That is, the voltage of the second node N 2 is V cc2 . Although the control line 140 is short-circuited with the first high-potential node 120 when comparing the high-potential short-circuit state to the steady state, it is confirmed that the voltage of the second node N 2 is not affected have.

&Lt; In the case where the driving switch is in the turned-on operation mode and the control line is in the low potential shorting state >

Next, referring to FIG. 9, a state in which the driving switch 150 is in the turned-on operation mode and the control line 140 is in the low potential shorting state (see arrow D) is shown. As shown, since the first low-potential node 130 and the control line 140 are short-circuited although the driving switch 150 is turned on, the first node N 1 is connected to the first low- To the ground GND1 connected to the ground. Thus, the current flows along the dotted line in Fig. As a result, the voltage of the second node N 2 is equal to the sum of the voltage applied to the second resistor R 2 and the voltage applied to the first diode D 1 . That is, the voltage of the second node N 2 is expressed by the following equation.

V (N 2 ) = V (D 1 ) + V (R 2 )

= V (D 1 ) + (V cc 2 -V (D 1 )) * (R 2 / (R 1 + R 2 ))

Here, V (D 1 ) is a voltage applied to the first diode (D 1 ), and V (R 2 ) is a voltage applied to the second resistor (R 2 ). In the above equation, V (R 2 ) can be calculated by dividing the sum of the voltage applied to R 1 and the voltage applied to R 2 according to the magnitude of the resistance. That is, V (R 2 ) becomes (V cc2 -V (D 1 )) * (R 2 / (R 1 + R 2 )). On the other hand, since the voltage V (D 1 ) applied to the first diode D 1 is determined according to the specification of the diode element, it can be treated as a constant.

Next, a process of calculating the voltage of the second node N 2 in four states in which the control line can be placed in the operation mode in which the drive switch is turned off will be described.

Figures 10-13 illustrate four states in which the control line may be placed in an operating mode in which the drive switch is turned off.

&Lt; When the driving switch is turned off and the control line is in the normal state >

10, a state in which the drive switch 150 is in an operation mode in which the drive switch 150 is turned off and a state in which the control line 140 is in a normal state (see arrow A) is shown. As shown, since the driving switch 150 is turned off, the first node N 1 is connected to the first low-potential node 130 through the driving load 110, And is connected to the second low-potential node 221. Thus, the current flows along the dotted line in Fig. In this case, the voltage of the second node N 2 is controlled by the voltage applied between the first node N 1 and the grounds GND 1 and GND 2 , the voltage applied to the first diode D 1 , R 2 ). That is, the voltage of the second node N 2 is expressed by the following equation.

V (N 2 ) = V (R 3 // R L ) + V (D 1 ) + V (R 2 )

= V (D 1 ) + V (R 3 // R L ) + V (R 2 )

= V (D 1) + ( V cc2 -V (D 1)) * ((R 2 + (R 3 // R L)) / (R 1 + R2 + (R 3 // R L)))

= V (D 1) + ( V cc2 -V (D 1)) * ((R 2 + ((R 3 * R L) / (R 3 + R L))) / (R 1 + R 2 + ( R 3 * R L ) / (R 3 + R L )))

Here, V (D 1 ) is a voltage applied to the first diode D 1 , V (R 2 ) is a voltage applied to the second resistor R 2 , and V (R 3 // R L Is a voltage applied between the first node N 1 and the ground GND1 and GND2. V (R 3 // R L ) is a voltage applied to the equivalent resistance of the resistance of the third resistor R 3 and the driving load 110 (the resistance of the third resistor and the driving load is connected in parallel) equal to the voltage applied between the (N 1) and the ground (GND1, GND2). In the above equation, V (R 3 // R L ) + V (R 2 ) represents the sum of the voltage applied to R 1 and the voltage applied to R 2 and R 3 // R L , And can be calculated. That is, V (R 3 // R L ) + V (R 2) is, (V cc2 -V (D 1 )) * ((R 2 + (R 3 // R L)) / (R 1 + R 2 + (R 3 // R L ))). And, (V cc2 -V (D 1 )) * ((R 2 + (R 3 // R L)) / (R 1 + R 2 + (R 3 // R L))) When the pool (V cc2 -V (D 1)) * ((R 2 + ((R 3 * R L) / (R 3 + R L))) / (R 1 + R 2 + (R 3 * R L) / (R 3 + R L ))).

Preferably, the resistance values of the first resistor R 1 , the second resistor R 2 and the third resistor R 3 are configured to have sufficiently large values, and the resistance value of the drive load 110 It should be large enough. That is, it is preferable that R 1 , R 2 , R 3 >> R L.

In this case, the above equation can be approximated as follows, and the voltage of the second node N 2 is not affected by R L.

V (N 2 ) = V (R 3 // R L ) + V (D 1 ) + V (R 2 )

= V (D 1) + ( V cc2 -V (D 1)) * ((R 2 + ((R 3 * R L) / (R 3 + R L))) / (R 1 + R 2 + ( R 3 * R L ) / (R 3 + R L )))

? V (D 1 ) + (V cc 2 -V (D 1 )) * (R 2 / (R 1 + R 2 ))

&Lt; When the drive switch is turned off and the control line is disconnected >

11, a state in which the drive switch 150 is in the turned-on operation mode and the control line 140 is in the disconnected state (see arrow B) is shown. As shown, since the driving switch 150 is turned off and the control line 140 is disconnected, the first node N 1 is connected to the second low potential node 221 through the second diagnostic line . Thus, the current flows along the dotted line in Fig. In this case, the voltage of the second node N 2 is controlled by the voltage applied to the third resistor R 3 , the voltage applied to the first diode D 1 , and the voltage applied to the second resistor R 2 Sum. That is, the voltage of the second node N 2 is expressed by the following equation.

V (N 2 ) = V (R 3 ) + V (D 1 ) + V (R 2 )

= V (D 1 ) + V (R 3 ) + V (R 2 )

= V (D 1) + ( V cc2 -V (D 1)) * ((R 2 + R 3) / (R 1 + R 2 + R 3))

Here, V (D 1 ) is the voltage applied to the first diode D 1 , V (R 2 ) is the voltage applied to the second resistor R 2 , and V (R 3 ) And the voltage applied to the resistor R 3 . In the above equation, V (R 3 ) + V (R 2 ) can be calculated by dividing the sum of the voltage applied to R 1 and the voltages applied to R 2 and R 3 according to the magnitude of the resistance. That is, V (R 3 ) + V (R 2 ) becomes (V cc 2 -V (D 1 )) * ((R 2 + R 3 ) / (R 1 + R 2 + R 3 )).

&Lt; When the driving switch is in an operation mode in which the driving switch is turned off, and the control line is in a high-

Next, referring to FIG. 12, a state in which the driving switch 150 is in an operation mode in which the driving switch 150 is turned off and a control line 140 is in a high potential shorting state (see arrow C) is shown. Although the driving switch 150 is turned off as shown, since the first high potential node 120 and the control line 140 are short-circuited, the voltage of the first node N 1 is lower than the voltage of the first high potential node Is equal to the voltage of the power source ( Vcc1 ) connected to the power source (120). Also, the potential of the power source V cc2 connected to the second high potential node 211 is lower than the potential of the power source V cc1 connected to the first high potential node 120, and the first diode D &lt; So that current can flow only in the direction from the high potential node 211 to the first node N 1 . Therefore, the voltage of the second node N 2 is equal to the voltage of the second high potential node 211. That is, the voltage of the second node N 2 is V cc2 .

<When the driving switch is in an operation mode in which the driving switch is turned off and the control line is in the low potential shorting state>

Next, referring to FIG. 13, a state in which the driving switch 150 is in an operation mode in which the driving switch 150 is turned off and a control line 140 is in a low potential shorting state (see arrow D) is shown. As shown, since the driving switch 150 is turned off and the first low-potential node 130 and the control line 140 are short-circuited, the first node N 1 is connected to the first low-potential node 130 To the ground GND1 connected to the ground. Therefore, the current flows along the dotted line in Fig. The voltage of the second node N 2 is equal to the sum of the voltage applied to the second resistor R 2 and the voltage applied to the first diode D 1 . That is, the voltage of the second node N 2 is expressed by the following equation.

V (N 2 ) = V (D 1 ) + V (R 2 )

= V (D 1 ) + (V cc 2 -V (D 1 )) * (R 2 / (R 1 + R 2 ))

Here, V (D 1 ) is a voltage applied to the first diode (D 1 ), and V (R 2 ) is a voltage applied to the second resistor (R 2 ). In the above equation, V (R 2 ) can be calculated by dividing the sum of the voltage applied to R 1 and the voltage applied to R 2 according to the magnitude of the resistance. That is, V (R 2 ) becomes (V cc2 -V (D 1 )) * (R 2 / (R 1 + R 2 )).

14 is a diagram showing a diagnosis table according to an embodiment of the present invention.

Referring to FIG. 14, there is shown a diagnostic table in which voltages of the second node N 2 are recorded in the two operation modes and the four operation states described with reference to FIGS. 6 to 13.

As shown in the diagnosis table, in the operation mode in which the drive switch 150 is turned on, the voltages of the second node N 2 are all the same except for the low-potential short-circuit state, so that the normal state, short- It is possible to confirm whether or not it is in any one of the short-circuit state and low-potential short-circuit state. That is, it is only possible to confirm whether or not the low-potential short-circuit state is present, and it is impossible to confirm whether the circuit is in a normal state, a short-circuit state, or a high-potential short-circuit state.

On the other hand, as shown in the diagnosis table, in the operation mode in which the drive switch 150 is turned off, since the voltage of the second node N 2 is different except for the steady state and the low potential short-circuit state, Whether it is in a high-potential short-circuited state, and whether it is in a steady-state or low-potential short-circuited state. In other words, in the operation mode in which the drive switch 150 is turned off, it is impossible to confirm which state is the steady state or the low-potential short-circuited state.

However, when the two operation modes are combined, the four states can be accurately diagnosed. That is, it is possible to check whether the drive switch 150 is turned off, whether it is in a disconnection state, a high-potential short-circuit state, and whether it is in a steady-state or a low-potential short-circuit state. It is possible to check whether the drive switch 150 is in the low-potential short-circuit state in the turned-on state. In other words, it is impossible to diagnose whether the control line 140 is in a normal state or in a low-potential short-circuited state when the drive switch 150 is turned off. However, when the drive switch 150 is turned on, It is possible to diagnose whether or not there is a low-potential short-circuit. Therefore, by combining two operation modes, it is possible to diagnose all four states.

In other words, when the state of the control line 140 can be diagnosed by only the voltage of the second node N 2 measured in any one of the two operation modes, the control unit may output the measured result in one operation mode If the state of the control line 140 can not be diagnosed by only the result in one operation mode, the result of the two operation modes is combined to determine the state of the control line 140 Can be diagnosed.

Hereinafter, a process of diagnosing the state of the control line using the diagnosis table prepared in advance by the control line diagnostic apparatus according to an embodiment of the present invention will be described.

First, the control unit turns on the drive switch 150. In the operation mode in which the driving switch 150 is turned on, the control unit measures the voltage of the second node N 2 measured by the voltage measuring unit 230. At this time, the control unit may store the voltage of the second node N 2 measured by the voltage measuring unit 230 in the operation mode in which the drive switch 150 is turned on, for example, as a storage means.

Then, the control unit turns off the driving switch 150. In the operation mode in which the driving switch 150 is turned off, the control unit measures the voltage of the second node N 2 measured by the voltage measuring unit 230. The control unit may store the voltage of the second node N 2 measured by the voltage measuring unit 230 in a storage unit or the like in the operation mode in which the driving switch 150 is turned off.

Next, the control unit inquires of the diagnosis table of a voltage substantially equal to the voltage of the second node N 2 measured by the voltage measuring unit 230 in the operation mode in which the drive switch 150 is turned on. If the voltage of the second node N 2 and the voltage of the low-potential short-circuit state recorded in the diagnosis table are substantially equal to each other, the control unit judges that the state of the control line 140 is low-potential short- . However, if the voltage of the second node N 2 is substantially equal to the voltage of the steady-state voltage, the voltage of the disconnected state and the voltage of the high-potential short-circuit state recorded in the diagnosis table, ) Can be diagnosed as being in any one of a normal state, a disconnection state, and a high potential short circuit state.

Then, the control section inquires of the voltage that is substantially the same voltage as the driving switch the second node, 150 is a measure turned in the off operation mode, the voltage measuring unit (230) (N 2) in the diagnosis table. If the voltage of the second node N 2 and the voltage of the disconnection state recorded in the diagnosis table are substantially equal to each other, the control unit can diagnose that the state of the control line 140 is in a disconnection state. If the voltage of the second node N 2 and the voltage of the high potential short circuit state recorded in the diagnostic table are substantially equal to each other, the control unit may diagnose that the state of the control line 140 is a high potential short circuit state . Alternatively, if the voltage of the second node N 2 is substantially equal to the voltage of the steady-state voltage and the voltage of the low-potential short-circuit state recorded in the diagnostic table, the control unit may control the drive switch 150 to turn on It is possible to diagnose whether the control line 140 is in the steady state or in the low-potential short-circuit state through the diagnosis result in the mode.

15 is a view schematically showing the configuration of a control line diagnostic apparatus according to another embodiment of the present invention.

Referring to FIG. 15, in comparison with the control line diagnostic apparatus according to the embodiment of the present invention shown in FIG. 1, a first diagnostic switch 212 is further provided on the first diagnostic line 210 There is a difference. That is, the control line diagnostic apparatus 200 according to another embodiment of the present invention is different in that the first diagnostic switch 212 is further provided on the first diagnostic line 210, Since the contents described in the above embodiments can be applied as they are, the differences will be mainly described.

The first diagnostic switch 212 may be a switching device that is installed on the first diagnostic line 210 and is selectively turned on or off according to a control signal. The first diagnostic switch 212 may be implemented with various switching elements. According to one embodiment, the first diagnostic switch 212 may be implemented as a MOSFET. Preferably, the first diagnostic switch 212 receives a control signal from the control unit and can be turned on or off.

The control unit may turn on the first diagnostic switch 212 when the control line 140 is to be diagnosed. On the contrary, the control unit may turn off the first diagnostic switch 212 when the diagnosis for the control line 140 is not performed. That is, the control unit controls the first diagnostic switch 212 so that the first diagnostic line 210 is not connected to the control line 140 so that the first diagnostic line 210 is connected to the drive circuit 100, And to control the first diagnostic switch 212 so that the first diagnostic line 210 is connected to the control line 140 when the diagnosis is to be performed.

16 is a diagram schematically showing a configuration of a control line diagnostic apparatus according to another embodiment of the present invention.

Referring to FIG. 16, in comparison with the control line diagnostic apparatus according to the embodiment of the present invention shown in FIG. 1, a second diagnostic switch 222 is further provided on the second diagnostic line 220 There is a difference. That is, the control line diagnostic apparatus 200 according to another embodiment of the present invention is different in that the second diagnostic switch 222 is further provided on the second diagnostic line 220, The contents described in the above embodiments can be applied as they are, so that the differences will be mainly described.

The second diagnostic switch 222 may be a switching device that is installed on the second diagnostic line 220 and is selectively turned on or off according to a control signal. The second diagnostic switch 222 may be implemented with various switching elements. According to one embodiment, the second diagnostic switch 222 may be implemented as a MOSFET. Preferably, the second diagnostic switch 222 may be turned on or off by receiving a control signal from the control unit.

The control unit may turn on the second diagnostic switch 222 when the control line 140 is to be diagnosed. Conversely, when the diagnosis for the control line 140 is not performed, the controller may turn off the second diagnostic switch 222. That is, the control unit controls the second diagnostic switch 222 so that the second diagnostic line 220 is not connected to the control line 140 so that the second diagnostic line 220 is connected to the drive circuit 100, And to control the second diagnostic switch 222 so that the second diagnostic line 220 is connected to the control line 140 when the diagnosis is to be performed.

17 is a diagram schematically showing a configuration of a control line diagnostic apparatus according to another embodiment of the present invention.

Referring to FIG. 17, in comparison with the control line diagnostic apparatus according to the embodiment of the present invention shown in FIG. 1, a first diagnostic switch 212 is further provided on the first diagnostic line 210, 2 diagnostic line 220 is further provided with a second diagnostic switch 222. [ That is, the control line diagnostic apparatus 200 according to another embodiment of the present invention further includes a first diagnostic switch 212 on the first diagnostic line 210 and a second diagnostic switch 212 on the second diagnostic line 220 There is a difference in that the second diagnostic switch 222 is further provided in the second embodiment, and the contents described in the above embodiments can be directly applied to other configurations.

The first diagnostic switch 212 and the second diagnostic switch 222 are installed on the first diagnostic line 210 and the second diagnostic line 220 respectively and are selectively turned on or off according to a control signal, And may be implemented with various switching elements, and may receive a control signal from the control unit and turn on or off.

The controller may turn on the first diagnostic switch 212 and the second diagnostic switch 222 when the control line 140 is to be diagnosed. Conversely, when the diagnosis for the control line 140 is not performed, the controller may turn off the first diagnostic switch 212 and the second diagnostic switch 222. That is, the control unit controls the first diagnostic switch 212 and the second diagnostic switch 222 so that the first diagnostic line 210 and the second diagnostic line 220 are not connected to the control line 140 at a normal time The first diagnostic line 210 and the second diagnostic line 220 minimize the influence of the first diagnostic line 210 and the second diagnostic line 220 on the drive circuit 100. When the first diagnostic line 210 and the second diagnostic line 220 May be controlled by the first diagnostic switch 212 and the second diagnostic switch 222 to be connected to the control line 140. [

In the above-described embodiments, the control line diagnostic apparatus 200 has been described as being included in the BMS and constituting a part of the BMS. However, in one embodiment, this is not so limited that the control line diagnostic apparatus 200 is included in the BMS and constitutes a part of the BMS. That is, the control line diagnostic apparatus 200 may be configured as a separate device, or may be a part of a control device other than the BMS or the battery pack 10.

In the context of the present disclosure, the control unit includes a processor, an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a register, a communication modem, a data processing device, etc., And may optionally include.

In addition, at least one of the control logic of the control unit may be combined, and the combined control logic may be written in a computer-readable code system and recorded in a computer-readable recording medium.

The type of the recording medium is not particularly limited as long as it can be accessed by a processor included in the computer. As one example, the recording medium includes at least one selected from the group including a ROM, a RAM, a register, a CD-ROM, a magnetic tape, a hard disk, a floppy disk and an optical data recording apparatus.

The code system may be modulated with a carrier signal and included in a communication carrier at a specific point in time, and may be distributed and stored in a networked computer. Also, functional programs, code, and code segments for implementing the combined control logic can be easily inferred by programmers skilled in the art to which the present invention pertains.

In describing the various embodiments disclosed herein, components labeled as 'parts' should be understood as functionally distinct elements rather than physically distinct elements. Thus, each component may be selectively integrated with another component, or each component may be divided into sub-components for efficient execution of the control logic (s). It will be apparent to those skilled in the art, however, that, even if components are integrated or partitioned, the integrity of the functionality can be recognized, it is understood that the integrated or segmented components are also within the scope of the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

1: battery cell 10: battery pack
20: inverter 30: electric motor
100: driving circuit, relay driving circuit
110: Driving load, relay
120: first high potential node 130: first low potential node
140: control line 150: drive switch
V cc1 , V cc2 : Power GND1, GND2: Ground
200: control line diagnostic device 210: first diagnostic line
211: second high potential node 212: first diagnostic switch
220: second diagnostic line 221: second low potential node
222: second diagnosis switch 230: voltage measuring unit
N 1 : first node N 2 : second node
R 1 : first resistance R 2 : second resistance
R 3 : third resistor D 1 : first diode

Claims (10)

A driving circuit for driving a driving load by flowing a current from a first high potential node to a first low potential node through a control line when the driving switch is turned on, characterized in that the potential of the driving switch is higher than the potential of the driving load The apparatus comprising:
A first diagnostic line having a first end connected to a first node formed on the control line and a second end connected to a second high potential node and having a first resistor, a second resistor and a first diode connected in series;
A second diagnostic line having one end connected to the first node and the other end connected to a second low potential node, and having a third resistor;
A voltage measuring unit measuring a voltage of a second node formed between the first resistor and the second resistor; And
And a control unit for controlling the drive switch to set a predetermined operation mode and diagnosing the state of the control line using the voltage value of the second node measured by the voltage measurement unit in the set operation mode,
Wherein the first diode is provided in the first diagnostic line to allow the flow of current from the second high-potential node to the first node.
The method according to claim 1,
The control unit records the voltage value of the second node measured in the operation mode in which the drive switch is turned on and the voltage value of the second node measured in the operation mode in which the drive switch is turned off in a pre- And diagnoses the state of the control line by comparing the calculated value with the calculated value.
The method according to claim 1,
The state of the control line includes a high-potential short-circuit state in which the control line is short-circuited with the first high-potential node, a low-potential short-circuit state in which the control line is short-circuited with the first low- State and a normal state of the control line.
The method according to claim 1,
The first diagnostic line may further comprise a first diagnostic switch that is selectively turned on or off,
Wherein the control unit controls the first diagnostic switch to be turned on to diagnose the control line.
The method according to claim 1,
The second diagnostic line further comprises a second diagnostic switch that is selectively turned on or off,
Wherein the control unit controls the second diagnostic switch to be turned on to diagnose the control line.
The method according to claim 1,
And the first low-potential node and the second low-potential node are connected to the ground.
The method according to claim 1,
And the potential of the second high potential node is lower than the potential of the first high potential node.
The method according to claim 1,
And said control unit is a relay for driving said control line.
A BMS (Battery Management System) comprising a control line diagnostic apparatus according to any one of claims 1 to 8.
A battery pack comprising the control line diagnostic device according to any one of claims 1 to 8.
KR1020150120326A 2015-08-26 2015-08-26 Apparatus for diagnosing state of control line KR102050529B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
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KR20190084547A (en) * 2018-01-08 2019-07-17 주식회사 엘지화학 Apparatus for diagnosing operation voltage line
WO2020145768A1 (en) * 2019-01-11 2020-07-16 주식회사 엘지화학 Battery pack diagnosis apparatus
US11204387B2 (en) 2018-01-30 2021-12-21 Lg Chem, Ltd. Apparatus for diagnosing relay driving circuit

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KR20130105982A (en) * 2012-03-19 2013-09-27 주식회사 엘지화학 Isolation resistance measurement apparatus having malfunction diagnosing function and malfunction diagnosing method using the same

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KR20130105982A (en) * 2012-03-19 2013-09-27 주식회사 엘지화학 Isolation resistance measurement apparatus having malfunction diagnosing function and malfunction diagnosing method using the same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190084547A (en) * 2018-01-08 2019-07-17 주식회사 엘지화학 Apparatus for diagnosing operation voltage line
US11204387B2 (en) 2018-01-30 2021-12-21 Lg Chem, Ltd. Apparatus for diagnosing relay driving circuit
WO2020145768A1 (en) * 2019-01-11 2020-07-16 주식회사 엘지화학 Battery pack diagnosis apparatus
KR20200087618A (en) * 2019-01-11 2020-07-21 주식회사 엘지화학 Apparatus for diagnosing battery pack
CN112154339A (en) * 2019-01-11 2020-12-29 株式会社Lg化学 Battery pack diagnostic apparatus
US11513139B2 (en) 2019-01-11 2022-11-29 Lg Energy Solution, Ltd. Battery pack diagnosis apparatus
CN112154339B (en) * 2019-01-11 2023-10-24 株式会社Lg新能源 Battery pack diagnosis apparatus, battery pack, and vehicle

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