KR101594895B1 - Apparatus and method for detecting failure of light emitting diode lighting in vehicle - Google Patents

Abstract

The present invention relates to a device and a method to detect the failure of a light emitting diode (LED) lighting in a vehicle, capable of detecting the failure of a vehicle and then informing a driver of the failure even through a bulb or an LED of the vehicle is not in operation. According to the present invention, the device to detect the failure of an LED lighting in a vehicle comprises: a power part to supply power to a vehicle; a lighting part formed by the combination of lamps and operated by a voltage received from the power part; a voltage limiter to prevent the voltage of a battery of the power part from flowing to a device connected to a next terminal; a failure detection part receiving a reference voltage while distributing the received reference voltage and providing information on the failure of the lighting part in accordance with a level of an output voltage; an LED failure detection part connected to the failure detection part to provide one among a basic detection mode to maintain the distributed state and a high pressure detection mode to maintain a state where the voltage is not distributed by controlling the distribution of the reference voltage of the failure detection part; and a microprocessor to determine the failure of the lighting part in accordance with the voltage level provided to the basic detection mode and the high pressure detection mode from the failure detection part. Thus, the present invention informs the driver of the failure of the lamps by detecting the failure of the lamps regardless of the type of lamps comprising the bulb or the LED.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for detecting a failure of a vehicle LED illumination,

The present invention relates to an apparatus and a method for detecting a failure of a vehicle LED light, and more particularly, to an apparatus and method for detecting a failure of a vehicle when a light bulb or an LED (Light Emitting Diode) To an apparatus and method for detecting a failure of a vehicle LED light.

The role of various lamps in automobiles is very important. For example, brakes prevent the collision by informing the following vehicles that the vehicle is slowing down. Therefore, due to the importance of the collision, Brakes are also installed at the center of the rear window. In the case of taillamps (or so-called car storms), it is used to notify other vehicles when the vehicle is operating at night, and the back-up lights inform the other vehicles of the intention of the current back- Each indicator lamp has a very important meaning, such as informing me that I am going to switch directions.

Failure of the lamps to operate these important lamps can lead to serious accidents. For example, if the brakes do not work, the vehicle can not be notified of the speed reduction in the following vehicle, leading to a crash. Otherwise, at night, especially on the highway, I can not tell my presence to the following vehicle and lead to a big accident.

However, since lamps used in vehicles have a limited life span, breakdowns are necessarily inevitable, but there is a problem that it is not easy for a driver to find out if a breakdown occurs. That is, when the vehicle is operated during the daytime, the lamp is not turned on, so that the trouble can not be known. Even if it is nighttime, the lamp failure that the driver can detect inside the vehicle is only about the headlight. In order to detect a fault, the vehicle must be turned on and all of the lamps must be turned off and the driver must look outside, especially in the case of brakes, since the driver only needs to press the brake pedal to operate.

When the lamp is turned on by the operation of the driver, it is possible to detect whether the lamp is defective by detecting the current flowing and checking whether or not current flows normally in the lamp. In this case, a method of using a resistor according to a method of checking a current flow has been proposed.

However, in a method of detecting a current using a resistor, a large current flows in a case where the lamp capacity is large. Therefore, a large-capacity resistance that can withstand the large current is used. Since the capacity is different for each lamp, And the heat loss is generated for each resistor. Therefore, the manufacturing process is complicated as well as the device itself in consideration of this point.

Recent vehicle lamps have begun with high-end vehicles, bulb-type lamps have disappeared, and LED-type lamps are gradually being spotlighted. This is due to the low failure rate of the LED, low power consumption and long life span. In addition, LEDs are increasingly used in vehicles because they exhibit higher illuminance than ordinary bulb type lamps for the same power.

On the other hand, there is a difference between detecting a failure when the illumination used in a vehicle is a bulb type lamp and detecting a failure when the lamp is an LED type lamp. That is, if the light used in the vehicle is an LED and it is identified with a lamp of a bulb type, an error may occur when detecting a fault. This is because, unlike a normal light bulb, an LED has an offset voltage, so that a voltage is induced even if it is normal.

1 is a circuit diagram showing a schematic circuit configuration for detecting a failure of a vehicle LED illumination according to the prior art. Referring to FIG. 1, the relay RY is a switch for connecting a battery and a lamp in an automobile, and controls and connects the lamp B101 and the power source (+ B).

The output voltage Vo of the failure detection circuit has the following states. First, when the relay RY is turned on by the driver, the lamp B101 is turned on. In this case, the output voltage Vo is divided into a first resistor R101 and a Zener diode DZ101 having a breakdown voltage of 10V ). ≪ / RTI > If there is no abnormality in the lamp B101 and the relay RY connecting the input power source (+ B) of the automobile and the lamp B101 is off, the second resistor R102 and the third resistor R103 And the + 5V distributed to the lamp B101 flows into the lamp B101. At this time, since the internal resistance of the lamp B101 is much smaller than the second resistor R102 and the third resistor R103, the output voltage Vo appears to be a very low voltage.

In the case where the lamp B101 is broken due to disconnection or the like, the bias generated by the second resistor R102 appears to be distributed to the third resistor R103 in a state in which the bias does not flow out to the lamp side, (Vo) is approximately + 5V. That is, when a problem occurs in the lamp B101, since the surface input voltage Vi is distributed only to the second resistor R102 and the third resistor R103, the output voltage Vo is approximately + 5V. However, in the case of an LED, unlike a light bulb, an offset voltage exists, so that a voltage is induced even when the LED is normal. After testing a lamp consisting of LEDs, the offset appears as: In the case of rear-seat brakes, it rose to 7V without charge and gradually increased to 7.5V in case of forward turn signal lamp.

As described above, when the rear brake lamp is implemented as an LED lamp and the failure is tested, the offset voltage is about 7V due to the characteristics of the LED. In implementing the LED as a lamp, three to four LEDs and a current limiting resistor are connected in series to form a string, and three to four strings are formed in parallel. The offset voltage thus appears up to 7V. In particular, when the forward direction indicator is implemented by an LED lamp, since the number of LEDs is large, constant current driving is required. In implementing such an LED lamp, a capacitor is inserted to improve the constant current characteristics. For example, when the front direction indicator is implemented by an LED, the voltage gradually increases to about 7.5V. In this case, since the microprocessor judges only by the voltage, it does not recognize that it is the LED and it can be judged as a failure.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a fault detection device for a vehicle LED light which can detect whether a lamp fails or not, And a method thereof.

According to an aspect of the present invention, there is provided a fault detection apparatus for a vehicle LED light including: a power supply unit for supplying power to a vehicle; A lighting unit configured by a combination of lamps and operated by receiving a voltage from the power supply unit; A voltage limiter for preventing a voltage of the power source battery from flowing to a device connected to the next stage; A failure detector for receiving a reference voltage and distributing the supplied reference voltage and providing information on the failure of the illumination unit according to the level of the output voltage; An LED failure detection unit coupled to the failure detection unit to provide a basic detection mode for controlling the allocation of the reference voltage of the failure detection unit to maintain the allocation state and a high voltage detection mode for keeping the voltage unapplied; And a microprocessor for determining whether the illumination unit is faulty according to the voltage level provided in the basic detection mode and the high pressure detection mode from the failure detection unit.

The fault detection device of the vehicle LED illumination may further include a multiplexer disposed between the voltage limiter and the fault detection unit and connected to any one of the lamps.

The fault detection device for the vehicle LED illumination further comprises a buffer for dividing the voltage input from the fault detection section to the microprocessor.

The fault detection device for the vehicle LED illumination may further include a display unit for receiving and displaying information from the microprocessor that determines whether the illumination unit is faulty.

The voltage limiter may be a zener diode connected in parallel to the illumination unit and the multiplexer in the reverse direction.

And the failure detection unit is composed of two resistors which receive a reference voltage for supplying a voltage lower than the voltage of the power supply unit and divide the reference voltage.

The LED failure detection unit is composed of a switch connected to the ends of the two resistors. When the switch is closed, the LED failure detection unit operates in the basic detection mode. When the switch is opened, the LED failure detection unit operates in the high pressure detection mode.

And the reference voltage is set to the same value as the breakdown voltage of the Zener diode.

Wherein the display unit displays the failure information for each of the lamps in a text form and the lamp information in the form of a graphical user interface at a position corresponding to information indicating the vehicle, And at least one of them is displayed.

According to an aspect of the present invention, there is provided a fault detection method for a vehicle LED light including: a power supply unit for supplying power to a vehicle; A lighting unit configured by a combination of lamps and operated by receiving a voltage from the power supply unit; A voltage limiter for preventing a voltage of the power source battery from flowing to a device connected to the next stage; A failure detector for receiving a reference voltage and distributing the supplied reference voltage and providing information on the failure of the illumination unit according to the level of the output voltage; An LED failure detection unit coupled to the failure detection unit to provide a basic detection mode for controlling the allocation of the reference voltage of the failure detection unit to maintain the allocation state and a high voltage detection mode for keeping the voltage unapplied; And a microprocessor for determining a failure of the illumination unit according to the voltage level provided in the basic detection mode and the high-voltage detection mode from the failure detection unit, the method comprising the steps of: Selecting a connection of a switch of the multiplexer sequentially or selectively using a selection signal to select one of the multiplexers; If the voltage input from the failure detection unit through the switch in the basic detection mode goes to the high voltage detection mode if the voltage is half the reference voltage and if the voltage input from the failure detection unit in the high voltage detection mode is the reference voltage value, process; And displaying the lamp determined as the failure as a failure.

The reference voltage is set to 10V, and if the voltage input from the failure detection unit in the basic detection mode is 8V or more, the lamp is judged to be in the abnormal state and the judgment is suspended. If the voltage is less than 2V, ; If the voltage input from the failure detection unit in the basic detection mode is 2V to 5V, proceeding to a high voltage detection mode; A step of determining that a surface fault occurs when the voltage input from the failure detection unit in the high voltage detection mode is more than 8V; And determining that the voltage is normal if the voltage input from the failure detection unit in the high voltage detection mode is 8 V or less.

When the voltage input from the failure detection unit in the high voltage detection mode is 8V or less, the illumination is the LED and the LED is determined to be in normal operation in the process of determining that the surface is normal.

An apparatus and method for detecting a failure of a vehicle LED light of the present invention having the above-described configuration provides an effect of detecting whether a lamp fails or not, and notifying a driver of the failure regardless of whether the lamp is of a bulb type or an LED.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit diagram showing a configuration for diagnosing a failure of illumination in an automobile according to the prior art; Fig.
2 is a block diagram showing a configuration of an apparatus for detecting a failure of a vehicle LED illumination according to an embodiment of the present invention.
Figure 3 illustrates the detection of a fault in accordance with an output voltage in accordance with an embodiment of the present invention.
4 is a circuit diagram showing an equivalent circuit configuration for detecting a failure of a vehicle illumination according to an embodiment of the present invention;
5 is a circuit diagram showing a circuit configuration implementing the equivalent circuit of FIG. 4 according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of a circuit of FIG. 2 according to an embodiment of the present invention. FIG.
7 is a flowchart for explaining a method of detecting a failure of a vehicle illumination according to an embodiment of the present invention;
FIG. 8 is a graphical representation of a user interface for displaying the status of a lamp in a display unit according to an exemplary embodiment of the present invention. FIG.
9 is a graphical user interface (GUI) for displaying the status of a lamp in a display unit according to an exemplary embodiment of the present invention.

Embodiments in accordance with the concepts of the present invention can make various changes and have various forms, so that specific embodiments are illustrated in the drawings and described in detail in this specification or application. It is to be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms of disclosure, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises ",or" having ", or the like, specify that there is a stated feature, number, step, operation, , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings showing embodiments of the present invention.

2 is a block diagram showing a configuration of an apparatus for detecting a failure of a vehicle LED illumination according to an embodiment of the present invention. 2, the present invention includes a power supply unit 100, an illumination unit 200, a voltage limiter 300, a multiplexer 400, a failure detection unit 500, an LED failure detection unit 502, a buffer 600, (700) and a display unit (800).

The power supply unit 100 is generally a battery of a vehicle and outputs a voltage of 12V to 15V. However, the voltage level of the power source unit 100 may drop to 11 V when the voltage level of the battery drops.

The lighting unit 200 is interrupted or connected by the power source 100 of the vehicle and the relay RY. The lighting unit 200 has a different arrangement in the case of a light bulb and the case of an LED, and can be classified as follows.

First, in the case of a bulb, the surface lamps are formed in a parallel combination, and in general, the lamps are often composed of two sets. For example, in the case of a head-light or a directional signal, two are set as left and right and back and forth. If the illumination unit 200 is a light bulb, it may be a combination of two such lamp sets. When the brake or the like is constituted by an LED, the offset voltage may be up to 7V as described above. However, due to the lighting characteristics of the LED, no offset can be generated to 10 V by the current limiting resistor or the control compliance of the constant current circuit.

The voltage limiter 300 prevents the voltage of the power supply unit 100 from flowing to the multiplexer 400 and the device connected to the next stage. For example, the voltage limiter 300 may be a Zener diode DZ101 connected in parallel to the illumination unit 200 and the multiplexer 400 in a reverse direction. The Zener diode DZ101 can be set to have the same breakdown voltage Vz as the reference voltage Vi of the failure detector 500 described later. For example, the breakdown voltage of the zener diode DZ101 is set to 10V.

The multiplexer 400 can sequentially or selectively select each analog switch using the selection signal SEL transmitted from the microprocessor 700 and controls the failure detector 500 to be connected to the lamp to be checked .

The failure detection unit 500 receives the reference voltage Vi separated from the power supply unit 100 and can measure the output voltage at the output terminal. That is, the failure of the illumination unit 200 can be detected according to the amount of voltage detected at the output terminal of the failure detection unit 500. For example, when the illumination unit 200 is in failure, the reference voltage set to be lower than the voltage of the power supply unit 100 is divided into a resistance connected in series to the failure detection unit 500, The voltage of Vi / 2 appears as the output voltage. For example, the reference voltage Vi may be set to a value selected from a value between 10V and 8V, and the resistance used in the failure detecting section 500 may be set using a resistance having a resistance sufficiently larger than the internal resistance of the lamp of the illumination section 200 Can be configured. The reference voltage Vi may be used by dropping the voltage of the power supply unit 100 or may be provided with a separate power supply.

When the relay of the power source unit 100 is turned on by the driver's operation, the voltage limiter 300 receives the voltage-limited voltage at the output terminal of the failure detector 500 irrespective of the failure of the illumination unit 200. [ At this time, since the limit voltage set in the voltage limiter 300, that is, the breakdown voltage is set to the reference voltage Vi, the reference voltage Vi is applied to the output terminal of the failure detector 500. In this case, Hold judgment.

If the relay unit RY connecting the power unit 100 of the vehicle and the illumination unit 200 is off and the half of the reference voltage Vi / The internal resistance of the lamp of the illumination unit 200 at this time is sufficiently smaller than the resistance value of the resistors constituting the failure detecting unit 500 so that most of the reference voltage is caught by the lamp and the output voltage Vo) appears as a very low voltage value. That is, since the failure detector 500 of the present invention uses a different reference voltage Vi than the power source 100, the voltage detected at the output terminal of the failure detector 500 is close to half of the reference voltage Vi / 2 If it is judged to be a value, it can be judged as a failure. However, when the voltage value appears to be a very low value, it is determined that the state is not a failure.

However, if the lamp is composed of LEDs, even if the LED operates normally due to the influence of the offset voltage, it can be judged as a failure. The LED failure detection unit 502 is connected to the failure detection unit 500 to detect a failure of the LED when the lamp is an LED. For example, if the output voltage Vo is approximately half of the reference voltage, it can be determined that the lamp is a lamp failure, as described above. However, when the lamp is composed of LEDs, since an offset voltage exists, a half value of the reference voltage may appear even when the LED is normal. Therefore, if the output voltage Vo is outputted as a half value of the reference voltage, it is a failure if it is a bulb, but it may be normal if it is an LED.

When a half value of the reference voltage is outputted as the output voltage value as described above, a switch for opening one resistor is connected to the end of the two resistors for dividing the reference voltage of the failure detector 500, The voltage will be divided to the resistor and the LED adjacent to the reference voltage Vi without being affected by the open resistor. At this time, if the LED fails, the voltage will not be applied to the LED, and the reference voltage Vi will be output. However, if the LED is normal, an offset voltage of about 7 V will be output. Accordingly, when the switch configured in the LED failure detection unit 502 is in the open state, if the lamp is in the form of a light bulb or an LED, if the voltage of about 7V is outputted, the current lamp is in the form of LED and can be detected as normal.

That is, if the LED failure detection unit 502 is closed, it is possible to detect a failure in the form of a bulb. However, even if it is determined that the lamp is faulty, if the lamp is constituted by a LED, it may not be a malfunction. Therefore, the state of the LED can be additionally determined through the LED failure detection unit 502.

The state of the lamp can be checked by detecting the output voltage Vo in the failure detector 500. The resistance value of the resistors constituting the failure detector 500 must be very large. Therefore, the impedance of the buffer 600 is much larger than this, so that it hardly affects the output voltage Vo.

The reference voltage Vi becomes the output voltage Vo and can be introduced into the microprocessor 700. [ When the reference voltage Vi is maximum, it may adversely affect the microprocessor 700, and therefore it is necessary to use the distribution resistor to distribute the output voltage Vi. However, since the impedance is changed by the distribution resistors and the normal voltage may not appear, the buffer 600 is composed of a transistor for amplifying a signal obtained by buffering the output voltage Vo and a bias resistor for voltage distribution do. That is, the buffer 600 distributes the output voltage Vo in half and applies the divided voltage to the microprocessor 700.

The microprocessor 700 sequentially or selectively selects each analog switch using the selection signal SEL transmitted to the multiplexer 400. [ The microprocessor 700 connects to the circuit of the corresponding lamp of the illumination unit 200 through the multiplexer 400. [

The microprocessor 700 converts a voltage value of an analog inputted through the buffer 600 into a digital voltage value and reads the digital voltage value from the buffer 600. The microprocessor 700 reads the voltage inputted through the buffer 600 from the failure detecting unit 500 and the LED failure detecting unit 502, It is possible to determine whether the illumination unit 200 has failed or not. For example, when the voltage value appears to be a very low value, it is determined that the state is not a failure. However, if it is determined that the output voltage is close to half of the reference voltage (Vi / 2), it is a failure in the case of a bulb type lamp, and may be a failure or failure in the case of an LED. When the lamp is composed of LEDs, since the offset voltage exists, half of the reference voltage may appear even if the LED is normal. Therefore, if the output voltage Vo is outputted as a half value of the reference voltage, it is a failure if it is a bulb, but it may be normal if it is an LED.

When the switch configured in the LED failure detection unit 502 is in an open state, whether the lamp is in a bulb shape or an LED shape, when a voltage of about 7 V is outputted, the current lamp is in an LED shape and can be detected as normal. If a voltage close to the reference voltage, that is, a voltage close to 10 V, is outputted in a state in which the switch constituted in the LED failure detecting unit 502 is open, it is judged as a failure regardless of whether it is an LED lamp or a bulb type lamp. The microprocessor 700 transmits the result of the determination to the display unit 800 so that the user or the driver can confirm whether the lamps of the illumination unit 200 are faulty in a GUI or text form.

3 is a diagram illustrating the detection of a fault according to an output voltage according to an embodiment of the present invention. Referring to FIG. 3, first, when the switch configured in the LED failure detecting unit 502 is in a closed state, it is expressed as a basic detection mode 310. That is, in the basic detection mode 310, since the reference voltage Vi is divided and caught by the failure detection unit 500, a voltage of 5 V is divided and applied when a reference voltage Vi of 10 V is applied. When the switch configured in the LED failure detection unit 502 is in the open state, it is represented by the high voltage detection mode 320. [ That is, in the high-voltage detection mode 320, since the reference voltage Vi is not divided by the failure detector 500 but only the resistance of the two resistors is close to the reference voltage Vi, the reference voltage Vi of 10 V is applied The voltage of 10 V is applied as it is.

In the basic detection mode 310, a reference voltage Vi of 10 V is applied regardless of a power source applied to the power source unit 100. In this state, when the output voltage Vo is 8V or more, it is determined that the voltage is applied to the corresponding lamp of the illumination unit 200, and the lamp failure is judged to be suspended.

In the basic detection mode 310, if the output voltage Vo is 2V or less, it is determined that the corresponding lamp of the illumination unit 200 is in a normal state.

In the basic detection mode 310, when the output voltage Vi is close to 5V, there are a number of cases where the normal bulb is faulty or the LED is normal. Therefore, in this case, it is not judged whether or not there is a failure.

As described above, when the output voltage Vi is approximately 5V, that is, when the output value between 2V and 8V is input, the process proceeds to the high-voltage detection mode 320. [ In the high-voltage detection mode 320, if the output voltage Vi is 10V, it is determined that both the normal bulb or the LED is faulty. If the detected voltage is 8 V or less, the corresponding lamp of the illumination unit 200 is an LED, and it is determined that the lamp is in a normal state.

4 is a circuit diagram showing an equivalent circuit configuration for detecting a failure of a vehicle illumination according to an embodiment of the present invention. Referring to FIG. 4, the relay RY is a switch for connecting a battery and a lamp in an automobile. The relay (RY) interlocks and connects the lamp (B101) and the power source (+ B). A relay for a head light or a directional signal, and a brake switch for a brake light. The apparatus for connecting the lamp B101 to the vehicle power supply + B may be a relay or a switch, but will be referred to as a relay RY for convenience.

The output voltage Vo of the failure detection circuit has the following states. First, when the relay RY is turned on by the driver, the lamp B101 is turned on. In this case, the output voltage Vo is represented by 10 V by the first resistor R101 and the Zener diode DZ101 . The reason why the voltage is limited by the Zener diode (DZ101) is that the power source of the vehicle (+ B), that is, the average voltage of the battery changes from + 12V to + 15V when the vehicle is running. The input voltage Vi is set to + 10V so that the battery voltage can be detected regardless of the battery voltage. However, the input voltage Vi may be a voltage of +10 V or less.

First, the case where the switch SW connected to the end of the failure detection circuit is closed, that is, the basic detection mode 310 will be described. In the basic detection mode 310, since the reference voltage Vi is divided and caught by the failure detection unit 500, when a reference voltage Vi of 10 V is applied, a voltage of 5 V is divided and applied.

If there is no abnormality in the lamp B101 in the basic detection mode 310 and the relay RY connecting the input power source of the vehicle to the lamp B101 is off, Most of the voltage distributed by the third resistor R103 is caught by the lamp B101. Since the internal resistance of the lamp B101 is much smaller than the second resistor R102 and the third resistor R103, the output voltage Vo appears to be a very low voltage.

In the case where the lamp B101 is broken due to the disconnection of the filament or other reasons in the basic detection mode 310, the bias generated by the second resistor R102 is not discharged to the lamp side, R102 and the third resistor R103, the output voltage Vo appears to be approximately + 5V. That is, when a problem occurs in the lamp B101, since the surface input voltage Vi is distributed only to the second resistor R102 and the third resistor R103, the output voltage Vo is approximately + 5V.

In the basic detection mode 310, when the lamp is constituted by an LED, the output voltage Vo can be close to 5 V even in a state where the LED is normal due to the offset voltage. Therefore, it can be mistakenly diagnosed as a failure even though it operates normally. In this case, the flow proceeds to the high pressure detection mode 320. [ As described above, the high-voltage detection mode 320 means opening the switch SW connected to the end of the failure detection circuit.

In the high-voltage detection mode 320, a reference voltage of 10 V is applied to the second resistor R102. In the high voltage detection mode 320, if the lamp is an LED, the reference voltage Vi will be divided by the voltage across the second resistor R102 and the LED. At this time, if the LED fails, the voltage will not be applied to the LED, and the reference voltage Vi will become the output voltage Vo. However, if the LED is normal, an offset voltage of about 7 V will be output. Accordingly, when the switch SW configured in the LED failure detection unit 502 is in the open state, the shape of the lamp and the failure of the lamp can be known. For example, when a voltage of 10V is output in the high-voltage detection mode 320, it is judged that the lamp is a failure, whether it is an LED type or a bulb type. However, when a voltage of less than 8V is outputted, the lamp is in the form of LED and can be judged as a normal state.

That is, if the switch SW constituting the LED failure detecting unit 502 is closed, that is, in the normal detection mode 310, it is possible to detect the failure of the bulb shape. However, even if the lamp is determined as a failure in the process of determining the failure of the bulb, if the lamp is composed of the LED, it may not be a failure. Therefore, the basic detection mode 310 and the high- 320 to sequentially determine whether the lamp of the lighting unit 200 is composed of LEDs and whether the lamp composed of LEDs is faulty.

5 is a circuit diagram showing a circuit configuration implementing the equivalent circuit of FIG. 4 according to an embodiment of the present invention. Referring to FIG. 5, the switch SW shown in FIG. 4 may be composed of a transistor which is generally controlled by a bias. Accordingly, FIG. 5 shows an embodiment in which the switch SW of FIG. 4 is implemented with a transistor Q102 controlled by a bias applied to the base.

FIG. 6 is a circuit diagram illustrating the circuit of FIG. 2 according to an embodiment of the present invention. Referring to FIG. 6, the diagram of FIG. 6 shows a state in which the structure shown in FIG. 2 is actually implemented by a circuit, and the description of each element has been described with reference to FIG. 2 to FIG. 5, do.

7 is a flowchart for explaining a method of detecting a failure of a vehicle illumination according to an embodiment of the present invention. Referring to FIG. 7, in step S702, the microprocessor 700 initializes a detection counter and initializes a lamp number to be detected.

In step S704, the microprocessor 700 selects the connection of the switches of the multiplexer 400 sequentially or selectively using the selection signal SEL transmitted to the multiplexer 400. [ The microprocessor 700 connects to the corresponding corresponding lamp circuit via the switch of each multiplexer 400. [

In step S706, the microprocessor 700 divides the basic detection mode 310, i.e., the reference voltage Vi, to select a mode to be used.

In step S708, the microprocessor 700 converts the analog voltage value input through the buffer 600 to a digital voltage value and reads the digital voltage value.

In step S710, the microprocessor 700 determines whether the voltage value output through the buffer 600 and input to the microprocessor 700 is equal to or greater than 8V. If it is determined in step S710 that the input voltage value is equal to or greater than 8V, the microprocessor 700 in step S712 suspends the determination of the failure of the lamp corresponding to the number of the corresponding lamp in operation.

If it is determined in step S710 that the input voltage value is 8V or less, the microprocessor 700 determines in step S714 whether the input voltage value is 2V or less. If it is determined in step S714 that the input voltage value is 2V or less, the microprocessor 700 records the fact that the corresponding lamp corresponding to the number of the corresponding lamp is not operating and is in a normal state in step S716. If it is determined in step S714 that the input voltage value is equal to or greater than 2V, the microprocessor 700 selects the mode to be used without dividing the high voltage detection mode 320, that is, the reference voltage Vi in step S718.

In step S720, the microprocessor 700 converts the analog voltage value input through the buffer 600 into a digital voltage value and reads the digital voltage value. In step S722, the microprocessor 700 determines whether the voltage value input from the fault detection unit 500 and the LED failure detection unit 502 to the microprocessor 700 through the buffer 600 is 8V or less.

If it is determined in step S722 that the inputted voltage value is 8V or less, the microprocessor 700 records the corresponding lamp corresponding to the number of the corresponding lamp in the normal state in step S724. At this time, the corresponding lamp operating in the normal state in step S724 may indicate that the lamp is an LED lamp. If it is determined in step S722 that the input voltage value exceeds 8V, the microprocessor 700 records the corresponding lamp corresponding to the number of the corresponding lamp in the fault state in step S726.

In step S728, the microprocessor 700 increments the lamp counter by one. In step S730, the microprocessor 700 determines whether or not the detection of failure of all the lamps is completed. For example, if it is assumed that there are forty lamps in the vehicle, and the count exceeds 40, that is, the count is 41, it can be determined that the inspection for all the lamps is completed. If it is determined in step S730 that failure detection for all the lamps is not completed, the process returns to step S704 to select an analog switch. If it is determined in step S730 that the failure has been detected for all of the lamps, the result of step S712, step S716, step S724, and step S726 is transmitted to the display unit 800 through a communication unit Lt; / RTI > That is, since only one value is output as the output voltage of the buffer 600, only one of the signals recorded in S712, S716, S724, and S726 is recorded. That is, only one result corresponding to the operation and failure of the lamp is recorded.

In step S734, the microprocessor 700 displays the recorded result of one of the steps S712, S716, S724, and S726 on the display unit 800 using a GUI (Graphic User Interface) or UX (User Experience) In a text form or a GUI form. The operator can easily know whether the lamp is normal or faulty via the displayed GUI or UX.

FIG. 8 is a graphical representation of a user interface for displaying the state of a lamp in a display unit according to an exemplary embodiment of the present invention. Referring to FIG. 8, the failure of the vehicle lamp is indicated by a user interface in the form of a table, and the states of the lamps are displayed in text form. As a result of detecting the failure of the lamp, if the lamp is detected as a failure, it is possible to blink the text indicated as " failure " For example, if it is determined that the lamp on the right side of the front direction indicator lamp is faulty, the text 'faulty' can be displayed in red and blinked simultaneously. On the other hand, when the 'switch to GUI mode' switch 102 on the lower right side is pressed, the GUI mode can be displayed. A diagram showing the state of the lamp in the GUI mode can be shown in Fig. 9 to be described later.

9 is a graphical user interface (GUI) for displaying the status of a lamp in a display unit according to an exemplary embodiment of the present invention. Referring to FIG. 9, when an icon corresponding to the corresponding lamp displayed by the GUI is touched or clicked, information of the corresponding lamp may be displayed as a pop-up. For example, the lamp indicating the front direction indicator on the right may blink in red to indicate failure, and if the user touches the lamp indicating the failure, the 'right front direction indicator' may be popup text or balloon word ). Similarly, when the 'switch to text mode' switch 104 on the lower right side is pressed, it is possible to switch to the text mode as shown in FIG.

8 and 9, the UI for displaying a failure in the display unit 800 of the present invention has been described. However, both of the two modes may be used as described above, or only one selected from the text mode and the GUI mode may be used .

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 limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. will be. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: power supply unit 200:
300: voltage limiter 400: multiplexer
500: failure detection unit 502: LED failure detection unit
600: buffer 700: microprocessor
800:

Claims (12)

A power supply unit for supplying power to the vehicle;
A lighting unit configured by a combination of lamps and operated by receiving a voltage from the power supply unit;
A voltage limiter for preventing a voltage of the power supply unit from flowing to a device connected to the next stage;
A failure detector for receiving a reference voltage supplied from a power supply separately from the power supply and distributing the supplied reference voltage and providing information on the failure of the illumination unit according to the level of the output voltage;
A multiplexer disposed between the voltage limiter and the fault detection unit and connected to any one of the lamps;
An LED failure detection unit coupled to the failure detection unit to provide a basic detection mode for controlling the allocation of the reference voltage of the failure detection unit to maintain the allocation state and a high voltage detection mode for keeping the voltage unapplied; And
And a microprocessor for determining whether the illumination unit is faulty according to a level of the output voltage provided in the basic detection mode and the high voltage detection mode from the failure detection unit,
Wherein the voltage limiter comprises:
Wherein the illumination unit and the multiplexer are connected in parallel in a reverse direction to the illumination unit and the multiplexer.
delete 2. The vehicle-mounted LED lighting device according to claim 1,
Further comprising a buffer for dividing a voltage input from the failure detection unit to the microprocessor.
2. The vehicle-mounted LED lighting device according to claim 1,
Further comprising: a display unit for receiving and displaying information indicating whether the illumination unit is faulty from the microprocessor.
The voltage limiter according to claim 1,
Wherein the light source is a Zener diode.
6. The apparatus according to claim 5,
And two resistors for receiving a reference voltage for supplying a voltage lower than the voltage of the power supply unit and dividing the reference voltage.
7. The LED driving circuit according to claim 6,
And a switch connected to an end of the two resistors. When the switch is closed, the reference voltage is distributed to the basic detection mode. When the switch is opened, the reference voltage is not distributed and one of the two resistors And operates in a high-voltage detection mode in which a resistance is applied.
7. The method of claim 6,
Wherein the first threshold value is set to the same value as the breakdown voltage of the Zener diode.
The display device according to claim 4,
Displaying fault information for each of the lamps in a text form and displaying the lamp information in a form corresponding to the information indicating the vehicle in the form of a graphical user interface according to information on whether the illumination unit is faulty or not Wherein the light source is a light emitting diode.
A power supply unit for supplying power to the vehicle; A lighting unit configured by a combination of lamps and operated by receiving a voltage from the power supply unit; A voltage limiter for preventing a voltage of the power supply unit from flowing to a device connected to the next stage; A failure detector for receiving a reference voltage supplied from a power supply separately from the power supply and distributing the supplied reference voltage and providing information on the failure of the illumination unit according to the level of the output voltage; A multiplexer disposed between the voltage limiter and the fault detection unit and connected to any one of the lamps; An LED failure detection unit coupled to the failure detection unit to provide a basic detection mode for controlling the allocation of the reference voltage of the failure detection unit to maintain the allocation state and a high voltage detection mode for keeping the voltage unapplied; And a microprocessor for determining the failure of the illumination unit according to a level of the output voltage provided in the basic detection mode and the high-voltage detection mode from the failure detection unit, wherein the voltage limiter is connected in parallel to the illumination unit and the multiplexer in a reverse direction A method of detecting a fault in a vehicle LED light using a fault detection device for vehicle LED illumination,
Selecting a connection of a switch of the multiplexer sequentially or selectively using a selection signal transmitted to the multiplexer;
If the voltage input from the failure detection unit through the switch in the basic detection mode goes to the high voltage detection mode if the voltage is half the reference voltage and if the voltage input from the failure detection unit in the high voltage detection mode is the reference voltage value, process; And
And displaying the lamp determined as the failure as a failure.
11. The method as claimed in claim 10,
Setting the reference voltage to a value of 10 V and determining that the voltage input from the failure detection unit in the basic detection mode is normal if the voltage is 2 V or less;
If the voltage input from the failure detection unit in the basic detection mode is 2V to 5V, proceeding to a high voltage detection mode;
A step of determining that a surface fault occurs when the voltage input from the failure detection unit in the high voltage detection mode is more than 8V;
When the voltage input from the failure detection unit in the high voltage detection mode is 8V or less, determining that the surface is normal.
12. The method of claim 11,
Wherein when the voltage input from the failure detection unit is equal to or lower than 8 V in the high voltage detection mode, the lighting is determined to be normal and the LED is determined to be in normal operation.

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