KR20100005990A - Junction box of vehicle having failure diagnostic system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a junction box of a vehicle in which a fault diagnosis apparatus is built, and uses a contact impedance of a fuse and a relay to determine a load of a load using the fuse and the relay. Disclosed are techniques for enabling diagnosis of open, short, and the like. The present invention includes a control board for controlling power applied to a load from a battery of a vehicle, and a fuse and a relay driven under the control of the control board to selectively supply the power to the load, wherein the control board includes a fuse and By diagnosing the state of the load by using the relay's contact impedance, it is possible to clearly understand whether there is a failure and to immediately deal with the failure.

Description

Junction box of vehicle having failure diagnostic system

1 is a block diagram of a junction box of a motor vehicle according to the present invention;

FIG. 2 is a detailed circuit diagram of the diagnostic unit of FIG. 1. FIG.

3 is a view for explaining a load diagnosis method using an impedance in the junction box of FIG.

4 is a view for explaining a communication system of the junction box of FIG.

<Explanation of symbols for the main parts of the drawings>

10: battery 20: vehicle diagnostic display unit

100: power board L: load

200: control board 210: voltage regulator

220: microcontroller unit 230: diagnostic unit

240: relay driver 250: can transceiver

260: fuse and relay 300: diagnostics

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a junction box of a vehicle in which a fault diagnosis apparatus is built, and uses a contact impedance of a fuse and a relay to determine a load of a load using the fuse and the relay. It is a technology that can diagnose open and short.

In general, the electric device of the car is a kind of nervous system, and only when the electric device is normally operated can the car exhibit excellent performance. The electric device of the vehicle is variously composed of the electric device of the engine related to the operation of the engine, and the vehicle electric equipment installed in each part of the body other than the engine.

Typically, wiring through a junction box is configured to supply electricity to various electric appliances and motor driving devices of the automobile. In the junction box, for example, a fuse, a relay, or the like is installed as a protection device for preventing overcurrent and overload from occurring in a fuel tank, an engine, an air conditioner, an equalizer, a warning display, and the like.

Such a junction box is used to aggregate electrical circuits such as a fuse or a relay in a vehicle, and a plurality of electrical circuits connected to each electrical apparatus are installed to operate various electrical apparatuses installed in the automobile.

The junction box acts as a distribution center that supplies power to the individual electrical and electronic components of the vehicle. The junction box also provides wiring and vehicle protection from fires caused by short circuits and electrical short circuits through fuses, relays, and diodes. Protect. In addition, the junction box configures circuits such as lamps, electric fans, power modes, and the like to control related electronic devices.

Such a junction box is called a second harness, and its importance is increasing as the vehicle is advanced and lightweight. The junction box treats the wiring from the harness to the fuses or relay terminals with a printed circuit board (PCB), and the wiring on the printed circuit board is electrically connected to the harness via a connector.

Junction boxes installed in the vehicle provide wiring reliability while improving workability, and are mounted around the engine compartment and the driver's seat to protect the circuitry of the wiring.

In the case of such a vehicle, the driver's safety is closely related to the driver's safety, so that the driver or the mechanic can easily identify the specific cause of the vehicle failure, for example, the inoperative operation of the vehicle load due to the power cut off or the damage of the specific vehicle load due to the overcurrent. Should be.

However, the junction box of the vehicle according to the related art does not have a system for clearly determining the diagnosis of the vehicle load. Accordingly, there is a problem that it is difficult to easily determine the defective portion of the vehicle.

The present invention has been made to solve the above problems, by using the contact impedance of the fuse (Fuse) and the relay (Relay) using the load (Open) and the load (Load) using the fuse (Relay) (Short) and so on, the purpose is to be able to diagnose.

The junction box of a vehicle in which the fault diagnosis apparatus of the present invention is built to achieve the above object comprises: a control board for controlling power applied to a load from a battery of the vehicle; And a fuse and a relay driven under the control of the control board to selectively supply power to the load, wherein the control board diagnoses the state of the load using the contact impedance of the fuse and the relay.

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

1 is a block diagram of a junction box of a vehicle according to the present invention.

The present invention includes a battery 10, a vehicle diagnostic display unit 20, a power board (100), and a load (L). The power board 100 includes a control board 200, a fuse, and a relay 260. In addition, the control board 200 includes a voltage regulator 210, a micro controller unit (MCU) 220, a diagnosis unit 230, a relay driver 240, and a CAN (Controller Area Network). ) Includes a transceiver 250.

The junction box having such a configuration is connected to the vehicle battery 10 for supplying power to various electrical appliances of the vehicle and intercepts the power supply of the battery 10. Accordingly, the electronic devices in the vehicle are operated by controlling the power supplied to the various loads L in the vehicle.

Here, the battery 10 of the vehicle applies power to the load L of various vehicles through the power board 100. Here, the load L of the vehicle may be, for example, an air conditioner, a vehicle headlight, a fog lamp, a fan, a compact disk player (CDP), a vehicle navigator, a vehicle PC, or the like.

The voltage regulator 210 adjusts the voltage applied from the battery 10 to supply driving power to the microcontroller unit 220.

In addition, the microcontroller unit 220 collects and outputs an operation record in the junction box, and transmits the open and short information of the load L diagnosed through the diagnosis unit 230 to the can transceiver 250. To pass.

In addition, the microcontroller unit 220 is connected to the can transmitting and receiving unit 250 to receive operation signals for various electronic devices applied from the can transmitting and receiving 250 to control the switching operation of the relay driver 240 and the like. . In addition, the microcontroller unit 220 serves to control all operations in the junction box.

In addition, the diagnosis unit 230 uses the contact impedance of the fuse and the relay 260 to power the vehicle battery 10 to diagnose the open and short of the load L operated by the fuse and the relay 260. Diagnose In addition, the diagnosis unit 230 transmits the open and short information of the diagnosed load L to the microcontroller unit 220.

In addition, the relay driver 240 controls the relay driving of the fuse and the relay 260. The fuse and the relay 260 may prevent the device of the vehicle from being damaged by a short or reverse current.

That is, the fuse and the relay 260 is a current higher than the set current to prevent secondary failure, for example, a short-circuit caused by a short-circuit or a long time overcurrent when a failure occurs in the equipment of the vehicle. When it flows, the heat generated inside will cut off the fuse.

In addition, the can transmitting and receiving unit 250 transmits and receives the diagnostic information of the load L applied from the microcontroller unit 220 with the vehicle diagnostic display unit 20. Accordingly, the vehicle diagnosis display unit 20 is notified of the abnormality of the load L diagnosed by the diagnosis unit 230 using CAN communication. On the other hand, the information applied from the vehicle diagnosis display unit 20 is transmitted to the microcontroller unit 220.

In addition, the vehicle diagnosis display unit 20 may detect a specific cause of a vehicle failure, for example, a failure of a vehicle load due to an open and a short of the load L or a breakdown of a specific vehicle load due to an overcurrent. It is a device that displays it so that mechanics can easily know it.

As a result, the vehicle diagnosis display unit 20 allows the driver or mechanic to clearly check the error information of the vehicle load L visually and audibly. Accordingly, when the driver and the mechanic checks the result of the load L not working properly, the driver and the mechanic can clearly grasp where the failure occurs, and immediately deal with the failure.

FIG. 2 is a detailed circuit diagram of the diagnostic unit 230 and the fuse and the relay 260 of FIG. 1.

The diagnosis unit 230 includes a plurality of resistors R1 to R5, a plurality of capacitors C2 to C4, a plurality of diodes D1, D2, and an amplifier A. The fuse and the relay driver 260 include a fuse F1 and a relay RLY.

The microcontroller unit 220 outputs a driving signal to the relay driver 240 through a digital port to drive the load L. Then, the driving signal is transmitted through the fuse F1 and the relay RLY of the fuse and the relay driver 260. According to the operation of the fuse F1 and the relay RLY, a current flows in the load L.

At this time, since the voltage between both ends of the fuse F1 is minute, it is amplified by the amplifier A of the diagnosis unit 230. In other words, a voltage difference occurs between both ends of the fuse F1 due to the impedances of the fuse F1 and the relay RLY.

The negative terminal of amplifier A is powered by battery 10 via resistor R4. The positive terminal of the amplifier A is applied with the voltage of the relay RLY through the resistor R5.

Here, the battery 10 is connected to the fuse F2, the load L is connected to one contact of the relay RLY. Here, the fuse F2 is a configuration for blocking the flow of excessive current in the power output from the battery 10.

Then, the amplifier A transmits the voltage value, in which the voltage applied through the resistors R4 and R5 is amplified by the values of the resistors R2 and R4, to the microcontroller unit 220. The voltage amplified by the amplifier A is input to the analog port of the microcontroller unit 220 through the resistor R1.

FIG. 3 is a diagram for describing a load diagnosis method using impedances in the junction box of FIG. 1.

The microcontroller unit 220 receiving the voltage amplified by the amplifier A checks the analog input every 1 kHz. In addition, after performing internal software filtering in consideration of external noise, the applied voltage value is controlled.

In this case, the internal software filtering method performs sampling eight times in a cycle of 1 ms as below and uses the average of these values as the actual voltage value.

Here, the actual voltage value means a voltage value obtained by amplifying the voltage between the both ends generated from the fuse F1 (micro resistor) due to the current consumed by the load L through the amplifier A.

value = (sample 1 + sample 2 + ... sample 7 + sample 8) / 8

That is, when eight samplings are performed in a 1 ms period, sampling is performed in an 8 ms period, and when the value sampled in the 8 ms period is checked five times in succession, the reference range of the normal operation is set. In this case, the reference range of normal operation is 40 mW.

Accordingly, as shown in FIG. 3, when the voltage applied to the microcontroller unit 220 is maintained in a range set by the normal operation, that is, 40 kV or more, the microcontroller unit 220 may be configured to maintain the load L. It is detected as a fail.

Here, the dotted line B of FIG. 3 shows the upper limit of the voltage which shows a normal operating range, and the dotted line C shows the lower limit of the voltage which shows a normal operating range.

Looking at the normal operating area, it can be seen that the time when the voltage sensed by the microcontroller unit 220 exceeds the upper limit is not maintained for 40 kHz and reaches the normal operating range. In this case, the microcontroller unit 220 recognizes the voltage variation due to noise and does not determine that the load L is a failure.

On the other hand, looking at the fail operation region, it can be seen that the time that the voltage sensed by the microcontroller unit 220 exceeds the upper limit value was maintained for 40 ㎳ or more, which is out of the normal operation range. In this case, the microcontroller unit 220 determines that the failure of the load L is detected.

That is, when the voltage applied from the diagnosis unit 230 exceeds the normal operating range, the microcontroller unit 220 determines that an error has occurred in the load L, and transmits the result to the can transceiver 250. .

FIG. 4 is a diagram for describing a communication system of the junction box of FIG. 1.

When the microcontroller unit 220 detects a fail state of the load L, the microcontroller unit 220 outputs the result to the can transceiving unit 250 to notify a user of an abnormal state. In addition, the microcontroller unit 220 allows the driver or mechanic to clearly check the error information of the vehicle load L through the vehicle diagnosis display unit 20 visually and audibly.

Here, the vehicle diagnostic display unit 20 notifies the user of the current state through the buzzer 21 or the light emitting diode LED 22 of the cluster.

In addition, the microcontroller unit 220 stores the current error state in an internal nonvolatile memory. When the load L changes to a normal state, the microcontroller unit 220 displays the state in which the load L returns to the normal operation state on the vehicle diagnosis display unit 20.

Then, the external controller 300 requests the microcontroller unit 220 for a past state of whether or not the load L is abnormal. Then, the microcontroller unit 220 transmits the value stored in the nonvolatile memory to the diagnostic apparatus 300 through the can transceiver 250.

Accordingly, the diagnostic apparatus 300 displays the current or past load L state on the display unit. Accordingly, by accumulating and storing the load L state of the past and present to facilitate the identification and analysis of the state of the failure.

As described above, the present invention diagnoses an open and a short of a load using a fuse and a relay by using the contact impedance of the fuse and the relay. Do it.

In addition, the driver or mechanic can clearly identify the error information of the vehicle load visually and audibly, so that it is possible to clearly identify in which part the failure occurs, and to immediately respond to the failure.

In addition, the current and past state of the load can be stored in non-volatile memory to monitor the current and past load state through the diagnostic device, providing an easy analysis of the cause and status of the failure.

In addition, a preferred embodiment of the present invention is for the purpose of illustration, those skilled in the art will be able to various modifications, changes, substitutions and additions through the spirit and scope of the appended claims, such modifications and changes are the following claims It should be seen as belonging to a range.

Claims (11)

A control board 200 which intercepts the power applied to the load L from the battery 10 of the vehicle; And A fuse and a relay 260 driven under the control of the control board 200 to selectively supply the power to the load L, The control board 200 is a junction box of a vehicle having a fault diagnosis apparatus, characterized in that for diagnosing the state of the load by using the contact impedance of the fuse and the relay (260). The method of claim 1, wherein the control board 200, A diagnosis unit 230 for detecting contact impedance information of the fuse and the relay 260; A micro controller unit 220 for determining and storing an error of the load according to an output voltage of the diagnosis unit 230; A relay driver 240 controlling driving of the fuse and the relay 260 according to the control of the micro controller unit 220; And Junction box of a vehicle with a built-in troubleshooting device, characterized in that it comprises a can transmission and reception unit 250 for transmitting the error information of the load (L) applied from the micro controller unit 220 to the outside through can communication . The control board of claim 2, wherein the control board further includes a voltage regulator 210 for adjusting the voltage applied from the battery 10 to supply driving power to the microcontroller unit 220. Car junction box with built-in troubleshooting device. The fault diagnosis apparatus according to claim 2, wherein the microcontroller unit 220 controls an operation of the relay driver 240 by receiving an operation signal applied from the can transceiver 250. Box of the old car. The vehicle diagnostic display unit 20 of claim 2, further comprising a vehicle diagnostic display unit 20 displaying error information of the load L applied from the microcontroller unit 220 through the can transceiver 250. The junction box of a car with a built-in troubleshooting device. The method of claim 2, wherein the diagnostic unit 230, A junction box of a vehicle in which a fault diagnosis apparatus is built, amplifying a voltage difference between both ends of the fuse corresponding to the impedance of the fuse and the relay 260 and outputting error information of the load. The method of claim 2 or 6, wherein the diagnostic unit 230, Junction box of a vehicle with a built-in troubleshooting device, characterized in that it comprises an amplifier (A) for amplifying the voltage applied from the battery (10) and the output voltage of the fuse and the relay (260). The method of claim 2, wherein the microcontroller unit 220, Junction box of a vehicle with a built-in troubleshooting device, characterized in that for sampling the output voltage of the diagnostic unit 230 at a specific cycle and averaging the sampled value. The method of claim 8, wherein the microcontroller unit 220, When the time when the output voltage of the diagnosis unit 230 is greater than the upper limit of the predetermined voltage is out of the normal operating range, it is determined that the load of the load (Fail) Junction box. The method of claim 2, wherein the microcontroller unit, Junction box of a vehicle with a built-in troubleshooting device, characterized in that for storing the error state of the measured load in a nonvolatile memory. The method of claim 10, wherein the microcontroller unit 220, Junction box of a vehicle with a built-in troubleshooting device, characterized in that for transmitting and receiving the past and current state of the load stored in the nonvolatile memory with an external diagnostic device (300).

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