KR102050529B1 - Apparatus for diagnosing state of control line - Google Patents

Apparatus for diagnosing state of control line Download PDF

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Publication number
KR102050529B1
KR102050529B1 KR1020150120326A KR20150120326A KR102050529B1 KR 102050529 B1 KR102050529 B1 KR 102050529B1 KR 1020150120326 A KR1020150120326 A KR 1020150120326A KR 20150120326 A KR20150120326 A KR 20150120326A KR 102050529 B1 KR102050529 B1 KR 102050529B1
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KR
South Korea
Prior art keywords
control line
node
diagnostic
switch
line
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KR1020150120326A
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Korean (ko)
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KR20170024818A (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]

Abstract

The present invention provides a device capable of diagnosing a state of a control line of a driving load at a relatively low cost, and discloses an apparatus capable of accurately diagnosing a state of a control line. Control line diagnostic apparatus according to an embodiment of the present invention, when the drive switch is turned on is a drive circuit for driving the driving load by flowing a current from the first high potential node to the first low potential node through the control line, An apparatus for diagnosing the control line of a driving circuit having a potential of a driving switch higher than that of the driving load, wherein one end is connected to a first node formed on the control line, and the other end is connected to a second high potential node. A first diagnostic line having a first resistor, a second resistor, and a first diode connected in series with each other; 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 resistance; A voltage measuring unit measuring a voltage of a second node formed between the first resistor and the second resistor; And a controller configured to control the driving switch to set a predetermined operation mode and diagnose a state of the control line using the voltage value of the second node measured by the voltage measuring unit in the set operation mode. The first diode may be provided in the first diagnostic line to allow a current to flow from the second high potential node toward the first node.

Description

Apparatus for diagnosing state of control line

The present invention relates to a technology for diagnosing a state of a control line for selectively controlling a drive for a driving load by conducting current, and more particularly, a control line for diagnosing various fault conditions that may occur in the control line. It relates to a diagnostic device.

Electrical appliances widely used in real life are configured to be driven by the conduction of current when current flows through the control line. For example, the relay (relay) is configured to close the electrical circuit when the current flows through the control line provided in the relay (open), open the electrical circuit when the current does not flow through the control line (open) do. However, if the control line is shorted or disconnected due to any cause, the flow of current through the control line is fixed and the driving load cannot be controlled.

As a more specific example, a relay used in an electric vehicle may be a representative example. BACKGROUND Recently, electric vehicles, which are gaining global attention, are equipped with relays to control electrical connections between secondary batteries and electric motors. The relay is controlled by a control system of an electric vehicle, and the control system has a self-diagnosis function for diagnosing a state of a relay control line. By the way, the self-diagnosis function provided in the control system was performed by additionally providing a current sensing circuit or separately expensive elements to determine whether a current flows in the control line. However, in recent years, there is an increasing demand to transfer a relay control function to a BMS, and according to such a demand, the BMS needs to diagnose a relay control line by itself. Relatively inexpensive and compact diagnostics are needed to allow the BMS to diagnose the condition of the relay control lines on its own.

Applicant has recognized the need for an apparatus capable of diagnosing the condition of a control line at a relatively low cost. SUMMARY OF THE INVENTION The present invention has been made in view of the above necessity, and an object of the present invention is to provide an apparatus capable of diagnosing a state of a control line of a driving load at a relatively low cost, and to provide an apparatus capable of accurately diagnosing a state of a control line.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized by the means and combinations thereof indicated in the claims.

Control line diagnostic apparatus according to an aspect of the present invention for achieving the above object, the current flows from the first high potential node to the first low potential node through the control line when the drive switch is turned on to drive the driving load A device for diagnosing the control line of a drive circuit in which the potential of the drive switch is higher than the potential of the drive load, wherein one end is connected to a first node formed on the control line, and the other end is a second high potential. A first diagnostic line connected to the node and having a first resistor, a second resistor, and a first diode connected in series with each other; 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 resistance; A voltage measuring unit measuring a voltage of a second node formed between the first resistor and the second resistor; And a controller configured to control the driving switch to set a predetermined operation mode and diagnose a state of the control line using the voltage value of the second node measured by the voltage measuring unit in the set operation mode. The first diode may be provided in the first diagnostic line to allow a current to flow from the second high potential node toward the first node.

The controller records a voltage value of the second node measured in the operation mode in which the drive switch is turned on and a voltage value of the second node measured in the operation mode in which the drive switch is turned off in a previously prepared diagnostic table. The state of the control line can be diagnosed by comparing with the calculated value.

The state of the control line may include a high potential short state in which the control line is shorted to the first high potential node, a low potential short state in which the control line is shorted to the first low potential node, and a disconnection of the control line. It may be one of a state and a steady state.

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

The second diagnostic line may further include a second diagnostic switch that is selectively turned on or turned off, and the controller 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 equal to or less than the potential of the first high potential node.

The driving load may be a relay.

Battery management system (BMS) according to another aspect of the present invention for achieving the above object may include the control line diagnostic device.

Battery pack according to another aspect of the present invention for achieving the above object may include the control line diagnostic device.

According to an aspect of the present invention, it is possible to provide a device capable of accurately diagnosing the state of a control line while diagnosing a state of a control line of a driving load at a relatively low cost.

In addition to the present invention may have a variety of other effects, these other effects of the present invention can be understood by the following description, it will be more clearly understood by the embodiments of the present invention.

The following drawings attached to this specification are illustrative of the preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.
1 is a view schematically showing the configuration of a control line diagnostic apparatus according to an embodiment of the present invention.
2 to 5 are diagrams each showing four states of control lines provided in the driving circuit.
6 to 9 are diagrams illustrating four states in which a control line can be placed in an operation mode in which a drive switch is turned on.
10 to 13 illustrate four states in which a control line can be placed in an operation mode in which a drive switch is turned off.
14 is a diagram illustrating a diagnostic 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 the configuration of a control line diagnostic apparatus according to another embodiment of the present invention.
17 is a diagram schematically showing the configuration of a control line diagnostic apparatus according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Throughout the specification, when a part is said to include a certain component, it means that it may further include other components, without excluding other components unless otherwise stated. In addition, the term 'control unit' described in the specification means a unit for processing at least one function or operation, which may be implemented by hardware or software, or a combination of hardware and software.

In addition, throughout the specification, when a part is 'connected' to another part, it is not only 'directly connected' but also 'indirectly connected' with another element in between. Include.

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

Referring to FIG. 1, the control line diagnosing apparatus 200 according to an embodiment of the present invention diagnoses a state of the control line 140 provided in the driving circuit 100. In the embodiment of FIG. 1, the control line diagnosis apparatus 200 diagnoses a state of the control line 140 of the relay 110 that electrically connects the battery pack 10 and the load. In FIG. 1, the load is an electric motor 30, and the electric motor 30 and the battery pack 10 are electrically connected 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 is an energy storage element, and preferably, may be a lithium secondary battery. However, the type of the battery cell 1 is not limited thereto. In addition, the battery cells 1 may be modularized by being connected in series or in parallel. That is, the battery cells 1 may be connected in series or in parallel with each other, or may be connected in series and in parallel. In the embodiment of FIG. 1, the battery cell 1 includes a plurality of battery cells 1 connected in series, but the number and connection relationships 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. In the embodiment of FIG. 1, the driving circuit 100 may be a circuit for driving the relay 110, and the driving load 110 may be referred to as a relay 110.

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

The driving switch 150 may be a switching device connected to one end of the control line 140 and selectively turned on or turned off according to a control signal. The driving switch 150 may be implemented with various switching elements. According to an embodiment, the driving switch 150 may be implemented as a MOSFET. Preferably, the driving switch 150 may be turned on or off by receiving a control signal from a controller to be described later.

The first high potential node 120 has a potential higher than that of the first low potential node 130, and thus, when the driving switch 150 is turned on, the first high potential node 120 is connected to the first high potential node 120 through the control line 140. The current flows from the 120 toward the first low potential node 130. A power source V cc1 is connected to the first high potential node 120 to have a higher potential than the first low potential node 130. According to an embodiment, the power source V cc1 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 thus, when the driving switch 150 is turned on, the first high potential node 130 is connected to the first high potential node 130 through the control line 140. The current may be conducted from the 120 toward the first low potential node 130. Preferably, the ground GND1 having a lower potential than the power supply V cc1 may be connected to the first low potential node 130.

The driving load 110 is connected to the other end of the control line 140 and configured to drive when a current flows through the control line 140. In the embodiment of Figure 1, the driving load 110 is a relay 110, when a current flows through the control line 140, the contact is connected to make an electrical connection between the battery pack 10 and the load.

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

On the other hand, the above-described driving circuit 100 is a relay driving circuit 100, the control line 140 provided in the driving circuit 100 is used to drive the relay 110, but as one embodiment, Of course, it can also be used to drive a drive circuit other than the relay (110). That is, the driving circuit 100 disclosed herein may be applied to drive a cooling fan, a cooling pump, etc. for cooling the battery in addition to the relay 110, and may be applied to other technologies besides the battery technology. to be. Similarly, the control line diagnosing 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 driving circuits. .

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

The first diagnosis 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 the first node (N 1 ) formed on the control line 140, the other end of the first diagnostic line 210 is the second classic It may be connected to the top node 211. The second high potential node 211 has a high potential when compared with the second low potential node 221 which will 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 that of the power source V cc1 . Here, the first node N 1 refers to 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 configured to be connected in series with each other. Here, the electric 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 in which the voltage measuring unit 230, which will be described later, measures a voltage. The first diode D 1 is a device that conducts a current in one direction, that is, a rectifying function. As shown in FIG. 1, the first diode D 1 permits the flow of current from the second high potential node 211 toward the first node N 1 and in the opposite direction. It may be provided in the first diagnostic line 210 to block the flow of current.

The second diagnostic line 220 may be connected between the control line 140 and the second low potential node 221. More specifically, one end of the second diagnosis line 220 may be connected to the first node N 1 , and the other end of the second diagnosis line 220 may be connected to the second low potential node 221. have. The second low potential node 221 has a low potential when compared with the second high potential node 211. 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 or the ground GND1 connected to the first low potential node 130. It may be an independent ground distinct from).

The voltage measuring unit 230 may measure the voltage of the second node N 2 . According to an 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 controller may control a switching operation of the driving switch 150. The controller may set an operation mode by controlling the switching operation of the driving switch 150. In addition, the controller 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 an embodiment, the control unit turns on the driving switch 150 to measure the second node N 2 measured by the voltage measuring unit 230 in an operation mode in which the driving switch 150 is turned on. And a voltage value of the second node N 2 measured by the voltage measuring unit 230 in an operation mode in which the driving switch 150 is turned off. It is possible to diagnose the state of the control line 140 by using. More specifically, the controller may include a voltage value of the second node N 2 measured in the operation mode in which the driving switch 150 is turned on, and a second value measured in the operation mode in which the driving switch 150 is turned off. The state of the control line 140 may be diagnosed by comparing a voltage value of the two nodes N 2 with a value recorded in a previously prepared diagnostic table.

On the other hand, the state of the control line 140 can be largely divided into a normal state and a fault state, the fault state, the high potential short-circuit state in which the control line 140 is short-circuited with the first high potential node 120, The control line 140 may be subdivided into a low potential short state in which the control line 140 is short-circuited with the first low potential node 130, and the control line 140 is disconnected.

2 to 5 are diagrams each showing four states of control lines provided in the driving circuit. 2 to 5 show the driving circuit of FIG. 1 and show four states in which control lines can be placed.

Referring to Fig. 2, the control line 140 is shown in a normal state (see arrow A). Referring to Fig. 3, the control line 140 is shown in the disconnected state (see arrow B). Referring to Fig. 4, the control line 140 is shown in a high potential short state (see arrow C). Referring to Fig. 5, the control line 140 is shown in a low potential short state (see arrow D).

Hereinafter, a process of creating a diagnostic table according to an embodiment of the present invention will be described. Subsequently, a 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 diagnostic table will be described.

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

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

<When the operation switch is turned on and the control line is in a normal state>

First, referring to FIG. 6, the driving switch 150 is in an turned-on operation mode, and the control line 140 is in a normal 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 supply V cc1 connected to the first high potential node 120. In addition , the potential of the power supply V cc2 connected to the second high potential node 211 is less than or equal to the potential of the power supply V cc1 connected to the first high potential node 120, and the first diode D 1 is the second potential. The high potential node 211 is provided such that current flows only in the direction of 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 operation switch is turned on and the control line is disconnected>

Subsequently, referring to FIG. 7, the driving switch 150 is in the turned-on operation mode, and the control line 140 is disconnected (see arrow B). 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 supply V cc1 connected to the first high potential node 120. In addition , the potential of the power supply V cc2 connected to the second high potential node 211 is less than or equal to the potential of the power supply V cc1 connected to the first high potential node 120, and the first diode D 1 is the second potential. The high potential node 211 is provided such that current flows only in the direction of 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 comparing the disconnected state with the normal state, there is a difference that the control line 140 is disconnected, but it can be confirmed that the voltage of the second node N 2 is not affected.

<When the drive switch is turned on and the control line is in the high potential short circuit state>

Next, referring to FIG. 8, the driving switch 150 is in the turned-on operation mode, and the control line 140 is in the high potential short state (see arrow C). 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 equal to the first high potential node. It is equal to the voltage of the power supply V cc1 connected to 120. In addition , the potential of the power supply V cc2 connected to the second high potential node 211 is less than or equal to the potential of the power supply V cc1 connected to the first high potential node 120, and the first diode D 1 is the second potential. The high potential node 211 is provided such that current flows only in the direction of 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 high potential short state is compared with the normal state, there is a difference that the control line 140 is shorted with the first high potential node 120, but it can be confirmed that the voltage of the second node N 2 is not affected. have.

<When the drive switch is turned on and the control line is in the low potential short circuit state>

Next, referring to FIG. 9, the driving switch 150 is in the turned-on operation mode, and the control line 140 is in the low potential short state (see arrow D). As shown, although the driving switch 150 is turned on, since the first low potential node 130 and the control line 140 are short-circuited, the first node N 1 is the first low potential node 130. Is connected to ground (GND1). Thus, current flows along the dotted line in FIG. 9. 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 as follows.

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

= V (D 1 ) + (V cc2 -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 addition, in the above equation, V (R 2 ) may be calculated by dividing the sum of the voltage applied to R 1 and the voltage applied to R 2 according to the size of the resistor. That is, V (R 2 ) becomes (V cc 2 -V (D 1 )) * (R 2 / (R 1 + R 2 )). On the other hand, the first diode voltage, V (D 1) to be applied to the (D 1) is because it is determined according to the specification of the diode elements can be handled 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 driving switch is turned off will be described.

10 to 13 illustrate four states in which a control line can be placed in an operation mode in which a drive switch is turned off.

<When the operation switch is turned off and the control line is in a normal state>

First, referring to FIG. 10, the driving switch 150 is in the turned-off operation mode, and the control line 140 is in a normal state (see arrow A). 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 through the second diagnostic line. It is connected to the second low potential node 221. Thus, current flows along the dotted line in FIG. 10. In this case, the voltage of the second node N 2 includes the voltage applied between the first node N 1 and the grounds GND1 and GND2, the voltage applied to the first diode D 1 , and the second resistor ( Equal to the sum of the voltages applied to R 2 ). That is, the voltage of the second node N 2 is as follows.

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 grounds GND1 and GND2. V (R 3 // R L ) is a voltage applied to an equivalent resistance of the resistance of the third resistor R 3 and the driving load 110 (the resistance of the third resistance and the driving load is connected in parallel). It is equal to the voltage applied between (N 1 ) and ground (GND1, GND2). Also, in the above equation, V (R 3 // R L ) + V (R 2 ) is the sum of the voltage applied to R1 and the voltage applied to R 2 and R 3 // R L according to the size of the resistor. Can be calculated by distribution. 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 ))) solves (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 preferably configured to have a sufficiently large value, and the resistance value of the driving load 110. It is good enough to compare with. That is, R 1, R 2, preferably the R 3 >> R L.

In this case, the equation may 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 cc2 -V (D 1 )) * (R 2 / (R 1 + R 2 ))

<When the operation switch is turned off and the control line is disconnected>

Subsequently, referring to FIG. 11, the driving switch 150 is in the turned-on operation mode, and the control line 140 is disconnected (see arrow B). 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. Connected. Thus, current flows along the dotted line in FIG. 11. In this case, the voltage of the second node N 2 is equal to 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 . Is equal to the sum. That is, the voltage of the second node N 2 is as follows.

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 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 ) is a third voltage. The voltage applied to the resistor R 3 . In addition, in the above equation, V (R 3 ) + V (R 2 ) may be calculated by dividing the sum of the voltage applied to R 1 and the voltage applied to R 2 and R 3 according to the size of the resistor. That is, V (R 3 ) + V (R 2 ) is (V cc 2 -V (D 1 )) * ((R 2 + R 3 ) / (R 1 + R 2 + R 3 )).

<When the operation switch is turned off and the control line is in the high potential short circuit state>

Next, referring to FIG. 12, the driving switch 150 is in the turned-off operation mode, and the control line 140 is in the high potential short state (see arrow C). As shown, although the driving switch 150 is turned off, since the first high potential node 120 and the control line 140 are short-circuited, the voltage of the first node N 1 is the first high potential node. It is equal to the voltage of the power supply V cc1 connected to 120. In addition, the potential of the power source V cc2 connected to the second high potential node 211 is less than or equal to the potential of the power source V cc1 connected to the first high potential node 120, and the first diode D 1 is represented by the second potential. The high potential node 211 is provided such that current flows only in the direction of 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 operation switch is turned off and the control line is in the low potential short circuit state>

Next, referring to FIG. 13, the driving switch 150 is in the turned-off operation mode, and the control line 140 is in the low potential short state (see arrow D). 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 the first low potential node 130. Is connected to ground (GND1). Thus, current flows along the dotted line in FIG. 13. 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 as follows.

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

= V (D 1 ) + (V cc2 -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 addition, in the above equation, V (R 2 ) may be calculated by dividing the sum of the voltage applied to R 1 and the voltage applied to R 2 according to the size of the resistor. That is, V (R 2 ) becomes (V cc 2 -V (D 1 )) * (R 2 / (R 1 + R 2 )).

14 is a diagram illustrating a diagnostic table according to an embodiment of the present invention.

Referring to FIG. 14, 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 is illustrated.

As shown in the diagnosis table, in the operation mode in which the drive switch 150 is turned on, since the voltages of the second node N 2 are the same except for the low potential short state, the normal state, the short state and the high potential Only one of the short-circuit states and the low potential short-circuit state can be checked. That is, only a low potential short state can be checked, and it is impossible to check whether the state is a normal state, a short state, or a high potential short state.

On the other hand, as shown in the diagnostic 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, disconnection It is possible to check whether it is in a state, a high potential short state, and whether it is a normal state or a low potential short state. That is, in the operation mode in which the drive switch 150 is turned off, it is impossible to check which state is the normal state or the low potential short state.

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

In other words, when the state of the control line 140 can be diagnosed using only the voltage of the second node N 2 measured in any one of the two operation modes, the controller returns the result measured in one operation mode. By diagnosing the state of the control line 140 by using, and if it is impossible to diagnose the state of the control line 140 only by the result in one operation mode, the state of the control line 140 is combined by combining the results of the two operation modes. Diagnosis can be made.

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

First, the controller turns on the driving switch 150. In the operation mode in which the driving switch 150 is turned on, the controller measures the voltage of the second node N 2 measured by the voltage measuring unit 230. In this case, the controller may store the voltage of the second node N 2 measured by the voltage measuring unit 230 in an operation mode in which the driving switch 150 is turned on, and the like.

Subsequently, the controller turns off the driving switch 150. In the operation mode in which the driving switch 150 is turned off, the controller 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 an operation mode in which the driving switch 150 is turned off.

Next, the controller queries the diagnosis table for 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 driving switch 150 is turned on. If the voltage of the second node N 2 and the voltage of the low potential short state recorded in the diagnosis table are substantially the same, the controller may diagnose that the state of the control line 140 is a low potential short state. Can be. In contrast, however, when the voltage of the second node N 2 is substantially the same as the voltage of the steady state, the disconnected state, and the voltage of the high potential short state recorded in the diagnostic table, the control unit 140 controls the control line 140. ) Can be diagnosed as one of a normal state, a disconnected state, and a high potential short state.

Next, the controller inquires from the diagnosis table about 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 driving switch 150 is turned off. If the voltage of the second node N 2 and the voltage of the disconnected state recorded in the diagnosis table are substantially the same, the controller may diagnose that the state of the control line 140 is the disconnected state. In addition, if the voltage of the second node N 2 and the voltage of the high potential short state recorded in the diagnosis table are substantially the same, the controller may diagnose that the state of the control line 140 is a high potential short state. Can be. In contrast, however, when the voltage of the second node N 2 is substantially the same as the voltage of the normal state and the voltage of the low potential short state recorded in the diagnostic table, the control unit operates when the driving switch 150 is turned on. The diagnostic result in the mode may diagnose whether the control line 140 is in a normal state or a low potential short state.

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 a control line diagnosis apparatus according to an embodiment of the present invention illustrated in FIG. 1, a first diagnosis switch 212 is further provided on the first diagnosis line 210. There is a difference. That is, the control line diagnostic apparatus 200 according to another embodiment of the present invention has a difference in that the first diagnosis switch 212 is further provided on the first diagnosis line 210. Since the content described in the above embodiments may be applied as it is, it will be described based on the differences.

The first diagnostic switch 212 may be a switching device installed on the first diagnostic line 210 and selectively turned on or off according to a control signal. The first diagnostic switch 212 may be implemented with various switching devices. According to one embodiment, the first diagnostic switch 212 may be implemented as a MOSFET. Preferably, the first diagnostic switch 212 may be turned on or off by receiving a control signal from a controller.

The control unit may turn on the first diagnosis switch 212 when the control line 140 is to be diagnosed. On the contrary, the controller may turn off the first diagnostic switch 212 when the diagnosis of the control line 140 is not performed. That is, the controller controls the first diagnostic switch 212 so that the first diagnostic line 210 is not normally connected to the control line 140, so that the first diagnostic line 210 is driven by the driving circuit 100. The first diagnostic switch 212 may be controlled such that the first diagnosis line 210 is connected to the control line 140 when the impact is to be minimized and the diagnosis is to be performed.

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

Referring to FIG. 16, in comparison with a control line diagnosis apparatus according to an exemplary embodiment of the present invention illustrated in FIG. 1, a second diagnosis switch 222 is further provided on the second diagnosis line 220. There is a difference. That is, the control line diagnostic apparatus 200 according to another embodiment of the present invention has a difference in that a second diagnosis switch 222 is further provided on the second diagnosis line 220. As described in the above embodiments can be applied as it is, it will be described based on the differences.

The second diagnostic switch 222 may be a switching device installed on the second diagnostic line 220 and selectively turned on or off according to a control signal. The second diagnostic switch 222 may be implemented with various switching devices. 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 a controller.

The controller may turn on the second diagnostic switch 222 when the control line 140 is to be diagnosed. On the contrary, the controller may turn off the second diagnostic switch 222 when the diagnosis of the control line 140 is not performed. That is, the control unit controls the second diagnostic switch 222 so that the second diagnostic line 220 is not normally connected to the control line 140 so that the second diagnostic line 220 is the driving circuit 100. The second diagnostic switch 222 may be controlled so that the second diagnostic line 220 is connected to the control line 140 when the impact is to be minimized and the diagnosis is to be performed.

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

Referring to FIG. 17, the first diagnostic switch 212 is further provided on the first diagnosis line 210 when compared with the control line diagnosis apparatus shown in FIG. 1. There is a difference in that the second diagnostic switch 222 is further provided on the second diagnostic line 220. That is, the control line diagnostic apparatus 200 according to another embodiment of the present invention further includes a first diagnosis switch 212 on the first diagnosis line 210 and on the second diagnosis line 220. There is a difference in that the second diagnostic switch 222 is further provided, and the descriptions of the above-described embodiments may be applied as it is to other configurations.

The first diagnosing switch 212 and the second diagnosing switch 222 are installed on the first diagnosing line 210 and the second diagnosing line 220, respectively, and are selectively turned on or off according to a control signal. The switching device may be implemented as various switching devices, and may be turned on or off by receiving a control signal from a controller.

When the control line 140 is to be diagnosed, the controller may turn on the first diagnosis switch 212 and the second diagnosis switch 222. In contrast, the controller may turn off the first diagnostic switch 212 and the second diagnostic switch 222 when the diagnosis of the control line 140 is not performed. That is, the controller controls the first diagnosis switch 212 and the second diagnosis switch 222 so that the first diagnosis line 210 and the second diagnosis line 220 are not connected to the control line 140 at normal times. In order to minimize the influence of the first diagnosis line 210 and the second diagnosis line 220 on the driving circuit 100, and to perform a diagnosis, the first diagnosis line 210 and the second diagnosis line 220 may be used. ) May control 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 to constitute a part of the BMS. However, this is one embodiment, and the control line diagnostic apparatus 200 is not necessarily limited to being included in the BMS to constitute a part of the BMS. That is, the control line diagnostic apparatus 200 may be configured as a separate device, or may constitute a part of a control device other than the BMS or the battery pack 10.

In the present disclosure, the control unit may be a processor, an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a register, a communication modem, a data processing device, or the like, which are known in the art for executing the above-described control logics. It may optionally include.

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

The recording medium is not particularly limited as long as it is accessible by a processor included in the computer. In one example, the recording medium includes at least one selected from the group consisting of a ROM, a RAM, a register, a CD-ROM, a magnetic tape, a hard disk, a floppy disk, and an optical data recording device.

The code scheme may be modulated into a carrier signal to be included in a communication carrier at a particular point in time, distributed and stored and executed on a networked computer. In addition, functional programs, code and code segments for implementing the combined control logics can be easily inferred by programmers in the art to which the present invention pertains.

In describing the various embodiments disclosed herein, elements designated as 'parts' should be understood to be functionally separated elements rather than physically separated elements. Thus, each component may be selectively integrated with other components or each component may be divided into subcomponents for efficient execution of control logic (s). However, it will be apparent to those skilled in the art that the integrated or divided components should also be interpreted as being within the scope of the present invention, provided that the functional identity can be recognized even if the components are integrated or divided.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

1: battery cell 10: battery pack
20: inverter 30: electric motor
100: drive circuit, relay drive 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 supply GND1, GND2: Ground
200: control line diagnostic apparatus 210: first diagnostic line
211: second high potential node 212: first diagnostic switch
220: second diagnostic line 221: second low potential node
222: second diagnostic switch 230: voltage measurement unit
N 1 : first node N 2 : second node
R 1 : first resistor R 2 : second resistor
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. The driving circuit has a potential higher than that of the driving load. An apparatus for diagnosing the control line of
A first diagnostic line connected between a first node and a second high potential node formed on the control line and having a first resistor, a second resistor, and a first diode connected in series with each other;
A second diagnostic line having one end connected to the first node, the other end connected to a second low potential node, and having a third resistance;
A voltage measuring unit measuring a voltage of a second node formed between the first resistor and the second resistor; And
And a controller configured to control the driving switch to set a predetermined operation mode and diagnose a state of the control line using the voltage value of the second node measured by the voltage measurer in the set operation mode.
The potential of the second high potential node is equal to or less than the potential of the first high potential node,
And the first diode is provided in the first diagnostic line to allow a current to flow from the second high potential node toward the first node.
The method of claim 1,
The controller records a voltage value of the second node measured in the operation mode in which the drive switch is turned on and a voltage value of the second node measured in the operation mode in which the drive switch is turned off in a previously prepared diagnostic table. And a control line diagnostic apparatus for diagnosing a state of the control line in comparison with the set value.
The method of claim 1,
The state of the control line may include a high potential short state in which the control line is shorted to the first high potential node, a low potential short state in which the control line is shorted to the first low potential node, and a disconnection of the control line. Control line diagnostic apparatus, characterized in that any one of a state and a normal state.
The method of claim 1,
The first diagnostic line further includes a first diagnostic switch that is selectively turned on or turned off,
The control unit, the control line diagnostic device, characterized in that for controlling the first diagnostic switch to turn on to diagnose the control line.
The method of claim 1,
The second diagnostic line further includes a second diagnostic switch that is selectively turned on or turned off,
And the control unit controls the second diagnostic switch to be turned on to diagnose the control line.
The method of claim 1,
And the first low potential node and the second low potential node are connected to ground.
delete The method of claim 1,
Control line diagnostic apparatus, characterized in that the drive load is a relay.
A BMS (Battery Management System) comprising a control line diagnostic apparatus according to any one of claims 1 to 6.
A battery pack comprising a control line diagnostic apparatus according to any one of claims 1 to 6 and 8.
KR1020150120326A 2015-08-26 2015-08-26 Apparatus for diagnosing state of control line KR102050529B1 (en)

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