KR101447783B1 - Apparatus for controlling a carseat - Google Patents

Abstract

A vehicle seat control apparatus is disclosed. The automobile seat control device includes a CAN communication unit that performs CAN communication with the seat device and the external device, a hall sensor input unit that receives a seat position signal sensed by the hall sensor, a switch input unit that receives a switch signal of the seat device, An MCU that receives signals from the CAN communication unit, the hall sensor input unit, and the switch input unit and performs a predetermined logic operation; an output unit that outputs a driving signal for driving the seat device based on the output from the MCU; And a power supply unit for supplying power to the CAN communication unit, the hall sensor input unit, the switch input unit, the MCU, the output unit, and the LED display unit, based on the output from the MCU. Therefore, the functions provided for the convenience of the driver such as the IMS function, the ventilation function, the heater function, and the lumber support function can be integrally controlled by a single device.

Description

[0001] APPARATUS FOR CONTROLLING A CARSEAT [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for controlling a car seat, and more particularly, to a device for controlling a convenience device of a car seat.

These days, the automobile seat generally has an integrated memory system (IMS) function, a heater function, and a lumbar support that comfortably supports the driver's lumbar spine, which memorizes the optimal seat position for each body type or driving habit for each driver lumbar support, ventilation, etc., so that the driver can operate comfortably.

However, in order to provide the IMS function, the ventilation function, the heater function, the lumbar support function, and the like of the car seat, parts for performing respective functions are separately provided on the car seat, The wiring harness) is increased, the arrangement is complicated, thereby reducing the space for mounting other parts in the seat, the cost increase due to an increase in the number of parts, the increase in weight of the car seat due to an increase in the number of parts, and the like There is a problem of.

In addition, there is a problem in that it is difficult to determine which parts fail when a failure occurs, because each of the parts responsible for the above functions is controlled by an electronic control unit (ECU) and operated separately.

Korean Patent Publication No. 10-1998-0039303 (September 15, 1998)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a vehicle seat control apparatus and a vehicle seat control method for controlling functions provided for a driver's convenience such as an IMS function, a ventilation function, a heater function, Device.

According to another aspect of the present invention, there is provided an automobile seat control apparatus for controlling a seat member of a vehicle, the automobile seat control apparatus comprising: A hall sensor input unit receiving a position signal of the seat sensed by the hall sensor, a switch input unit receiving a switch signal of the seat device, and a controller for inputting signals from the CAN communication unit, the hall sensor input unit, An output unit for outputting a driving signal for driving the device of the sheet based on an output from the MCU to the seat device; An LED display unit for displaying an operation state of the device of the seat based on the CAN communication unit, the hall sensor input unit, It is configured to include a power source for supplying power to an input value, MCU, the output section and the LED display.

Here, the seat device may include at least one of an integrated memory system (IMS) function, a heater function, a lumbar support function, and a ventilation function.

Here, the external device may include at least one of an In Panel Module (IPM), a Driver Door Module (DDM), and a cluster.

The output unit may include a motor output unit receiving a logic operation result of the MCU and outputting a signal for driving at least one of the operation posture storing function and the lumber support function, And a ventilation and heater output unit for outputting a signal for driving at least one function of the heater function and the ventilation function.

The power supply unit receives a plurality of power sources and detects a latch-up of the MCU, detects an abnormality of the MCU, resets the MCU when an abnormality of the MCU is detected, ). ≪ / RTI >

In addition, the switch input unit receives the switch signal from the switch of the seat device in a hard-wired manner, and can input the switch signal to the MCU through the reverse voltage prevention circuit and the current limit circuit.

In addition, the switch input unit may receive a signal from the NTC performing the stepwise temperature control of the heater function.

Further, the ventilation and heater output unit may include an intelligent power switching (IPS) element for detecting at least one of disconnection, short-circuit and over-current of the ventilated load power.

In addition, the MCU may perform a predetermined logical operation for performing a self-diagnosis of the seat device of the automobile.

In order to perform the above-described self-diagnosis, the MCU may further include a heater load diagnosis mode, an under temperature diagnosis mode, an NTC diagnosis mode, a ventilation load diagnosis mode, a ventilation PWM diagnosis mode, / Overvoltage diagnostic mode. ≪ / RTI >

Also, the LED display unit may operate the LED in any one of a turn-on, a turn-off, and a flashing according to a predetermined method based on a logic level of an output signal from the MCU.

Also, the LED display unit may operate the LED in any one of turn-on, turn-off, and flashing in accordance with a diagnostic mode for performing the self-diagnosis of the MCU.

According to the automobile seat control apparatus of the present invention, the functions provided for the convenience of the driver such as the IMS function, the ventilation function, the heater function, and the lumber support function can be integrated into one device.

Accordingly, the space in which the other parts mounted in the automobile seat can be mounted can be increased, the wiring harness can be reduced, and the number of parts can be reduced, thereby reducing the weight of the automobile seat and reducing the cost.

In addition, since the individual parts for performing the IMS function, the ventilation function, the heater function, and the lumber support function are integrated into one device, it is possible to diagnose the fault of the entire seat of the automobile integrally.

1 is an exemplary diagram showing a schematic configuration of an automobile seat control apparatus according to an embodiment of the present invention.
2 is a block diagram showing a configuration of an automobile seat control apparatus according to an embodiment of the present invention.
3 is a circuit diagram showing a circuit of an automotive seat control apparatus according to an embodiment of the present invention.
4 is a timing diagram showing the operation of a heater as an apparatus for controlling a seat member controlled by an automobile seat control apparatus according to an embodiment of the present invention.
5 is a table for explaining the operation of the LED display unit when an MCU of the automotive seat control apparatus detects an error according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

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.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary diagram showing a schematic configuration of an automobile seat control apparatus according to an embodiment of the present invention.

Referring to FIG. 1, an automobile seat control apparatus 100 for integrally controlling convenience devices of an automobile seat includes an IMS (Integrated Memory System) storing an optimal seat position corresponding to each body type or driving habit for each driver ) Function, a heater function, a lumbar support function for comfortably supporting the driver's lumbar support, and a ventilation function.

Specifically, the car seat control apparatus 100 controls the positions of the cushion and the back, and controls the operation of the above-described functions A tilt motor, a height motor, a recline motor, a cushion motor, a lumbar support motor, and the like, which control the operation of the slide motor.

In addition, the automotive seat control apparatus 100 controls the heater function, the ventilation function, and the like, so that the driver can operate comfortably.

FIG. 2 is a block diagram showing the configuration of an automotive seat control apparatus according to an embodiment of the present invention, and FIG. 3 is a circuit diagram showing a circuit of an automotive seat control apparatus according to an embodiment of the present invention.

2 and 3, an automobile seat control apparatus 100 is an apparatus for controlling a seat convenience apparatus of an automobile, in which an electronic control unit for a plurality of seat comfort apparatuses is integrated into one, And the weight and cost of the wiring harness and the seat can be reduced. The automobile seat control apparatus 100 includes the power supply unit 110, the hall sensor input unit 120, the switch input unit 130, the CAN (Controller Area Network) communication unit 140, an MCU (Microcontroller unit) 150, an output unit 160, and an LED display unit 170. Here, the seat fitting of the automobile may include an IMS (Integrated Memory System), a heater, a ventilation and a lumbar device.

The power supply unit 110 can supply power to the Hall sensor input unit 120, the switch input unit 130, the CAN communication unit 140, the MCU 150, the output unit 160, and the LED display unit 170, May be a plurality of power sources, and may include a regulator IC (Regulator IC).

Here, the plurality of power sources input to the power supply unit 110 may include an ECU B + power source, a power B + power source, an IGN1 power source, and an IGN2 power source. Specifically, the ECU B + power source can be used as a constant power source, for example, when performing a manual operation of a seat.

Further, the IGN1 power source can be used as a backup power source, for example, when performing a manual operation of the seat.

Further, the IGN2 power source can be used as the backup power source, for example, when the heater and the ventilator operate while the starter is on, so that the heater and the ventilator perform operations with the IGN2 power source.

The power B + 1 power can be divided into a power B + 1 power and a power B + 2 power according to the capacity of the fuse, and the power B + 1 power can be divided into a part for driving the motor by a relay control , A seat motor, a lumbar motor, etc., and can be used as a power source for operating a motor such as a seat motor or a lumber motor by operating the relay to ON.

In addition, the power B + 2 power source can be used as a power source in a part using an IPS (Intelligent Power Switching) device, for example, a ventilation motor, a heater, etc., It can be used as a power source to operate.

Here, the regulator IC is capable of applying a constant voltage of 5V to the MCU or other IC with an input voltage of 12V. Specifically, the regulator IC receives the constant voltage power supply ECU B + and the back-up power supply IGN1 power supply, outputs 5V voltage, and the output voltage can be used for MCU and IC operating voltage.

In addition, the regulator IC can perform a watch-dog function. Here, the watch-dog function may refer to a function of returning the processor to a normal state by using a reset signal, for example, when the processor is in an erroneous operation or an endless loop state. Specifically, the regulator IC has a latch-up state of the MCU, that is, when the input and output voltages exceed the rated voltage, a large current flows into the internal elements to reach a breakdown state or an error state, When the voltage exceeds the rated value, it is judged when the internal device is in the breakdown state, so that the abnormality of the MCU is monitored. If there is an abnormality, the MCU can be operated normally by using the reset signal.

The hall sensor input unit 120 can receive a position signal of the seat sensed by the hall sensor. For example, if the number of motors used in the seat is five (for example, Slide, Recline, Front Height, Rear Height, Cushion Extension, LumbarZ1, LumbarZ2) A pulse may be output from the pulse generator. Further, a signal sensed by one hall sensor per motor can be input. Here, the Hall sensor may be operated by receiving power from the power source unit 110. [

The switch input unit 130 may receive a switch signal of the seat device, and may include a reverse voltage prevention circuit and a current restriction circuit. Specifically, the switch input unit 130 receives a signal from the switch of the seat device, respectively, in a hard-wired manner, and the signal can be input to the MCU through the reverse voltage prevention circuit and the current restriction circuit. Here, the hardwire may refer to a circuit that is formed by only connecting a wire and a terminal but does not include a switch. Here, the switch of the seat member device may include a lumbar switch (Lumbar1 SW, Lumbar2 SW), a heater switch (HEATER SW), and a ventilation switch (VENT SW).

In addition, the switch input unit 130 may receive a signal from the NTC (Negative Temperature Sensor), which is a thermistor temperature sensor, for temperature control of the heater, which is one of the convenience devices of the seat. The NTC refers to a temperature sensor having a characteristic that the resistance value decreases when the temperature rises.

Also, the switch input unit 130 can receive the seat driving signal from the seat switch through the low-speed CAN communication.

The CAN communication unit 140 can perform CAN communication with the seat device and the external device.

Specifically, the CAN communication unit 140 is provided with a CAN communication unit 140 for performing an IMS landing interlock function, a seat position adjusting function, a sheet memory storing or reproducing function, a UMS (User Mode Setting) function, and a self- CAN communication can be performed by transmitting / receiving CAN data at a low transmission speed with an external device through a transmission / reception IC (CAN Transceiver IC). Here, the external device may include an In Panel Module (IPM), a Driver Door Module (DDM), a cluster, and the like.

Here, the UMS (User Mode Setting) function may mean a function of interlocking the seat position to / from the driver according to the driver's request.

The MCU 150 receives signals from the CAN communication unit 140, the hall sensor input unit 120 and the switch input unit 130 and performs predetermined logic operations to control the output unit 160 and the LED display unit 170 have.

For example, when the driver adjusts the seat switch, a signal is generated from the seat switch, receives the CAN signal generated from the seat switch through the CAN communication unit 140, performs predetermined logical operation, To the output unit 160.

The output unit 160 can output a driving signal for driving the device of the seat to the seat device based on the output from the MCU 150. The output unit 160 is connected to the motor output unit 161, And a heater output section 162.

Specifically, when receiving a high-level signal as a result of the logic operation of the MCU, the motor output unit 161 turns on a transistor (not shown) included in the relay control IC (Relay Control) .

On the other hand, when a low level signal is input as a result of the logical operation of the MCU, the transistor (not shown) included in the relay control IC (relay control) is turned off to block the current from flowing to the coil, have.

Here, the motor includes a slide motor SLIDE MTR, a RECLINE MTR, a FRT HEIGHT MTR, a RIGHT HEIGHT MTR, a CUSHION MTR, a lumbar motor, (LUMBAR Z1 MOTOR, LUMBAR Z2 MOTOR), and the like.

Specifically, the ventilation and heater output unit 162 can receive one of a high level signal, a middle level signal, and a low level signal as a result of logic operation of the MCU 150.

For example, when the driver turns on the heater switch, a high-level signal is input to the hardwire, and the input signal is input to the MCU through the voltage divider circuit and the current limiting circuit.

Thereafter, the MCU receives a high-level signal when the driver touches the heater switch once, a middle-level signal when the driver touches the heater switch twice, and the driver touches the heater switch three times And the driver can output the OFF signal when the heater switch is touched four times, but this is merely an example, and the present invention is not limited thereto.

On the other hand, when the ventilation and heater output section 162 receives a high level signal from the MCU 150, a high level signal is input to the dual channel IPS, and the IPS inputs the high level signal to the cushion and back part It is possible to operate the heater by separately outputting two high level signals. In addition, the IPS can detect disconnection, short-circuit and over-current of the load power of the heater.

In addition, the MCU receives a signal from the NTC and can perform ON / OFF control of the operation of the heater based on the target temperature corresponding to each level signal. Specifically, the ON / OFF control operation of the heater is performed by PWM (Pulse Width Modulation) duty of 100% for the high level signal, 70% for the middle level signal, 35% for the low level signal and 0% , And the control frequency can be plus or minus 5 Hz based on 100 Hz. Such PWM control can be repeatedly performed, and a detailed description will be given later with reference to FIG.

In addition, the ventilation and heater output section 162 may include an IPS capable of detecting disconnection, short-circuit and overcurrent of the load power of the heater, and may be configured to sense currents in the respective portions of the cushion and the back And when the MCU detects an abnormality based on the result of sensing the current, the off signal can be received from the MCU to turn off the heater.

Further, when the driver turns on the ventilation switch, for example, the ventilation and heater output section 162 inputs a high-level signal to the hardwire, and the input signal is input to the MCU through the voltage distribution circuit and the current limiting circuit .

Thereafter, the MCU receives a high-level signal when the driver touches the ventilation switch once, a middle-level signal when the driver touches the ventilation switch twice, and the driver touches the ventilation switch three times And the driver can output the OFF signal when touching the ventilation switch four times, but this is merely exemplary and not restrictive.

On the other hand, when the ventilation and heater output section 162 receives a high-level signal from the MCU, a high-level signal is input to the single channel IPS, IPS outputs a high-level signal to the ventilation motor, Off control can be performed. In addition, the IPS can detect disconnection, short-circuit and over-current of the load power source for ventilation.

Also, the ventilation on / off control operation of the MCU can be controlled by the PWM duty of 60% for the high level signal, 50% for the middle level signal, 45% for the low level signal and 0% for the OFF signal, Can be plus 5 Hz, minus 5 Hz based on 100 Hz, and such PWM control can be repeatedly performed.

In addition, the ventilation and heater output 162 may include an IPS capable of sensing disconnection, short-circuit and overcurrent of the ventilated load power source, and may include a current sensing circuit capable of sensing the current of ventilation, When the MCU detects an abnormality based on the result of sensing the current, the off signal can be input from the MCU to turn off the operation of the ventilation.

The LED display unit 170 can display the operating state of the device of the seat based on the output from the MCU. Specifically, the LED display unit 170 can display the operating state of the heater and ventilation.

Specifically, the LED display unit 170 may include at least three LED elements, and may indicate the operating state of the heater and ventilation in accordance with the logic level of a signal input from the MCU. Here, the MCU can receive a high-level signal, a middle-level signal, a low-level signal, and an off signal. The MCU receives a signal that turns on three LEDs when a high- A signal for turning on one LED when a low level signal is input, and a signal for turning on zero LEDs when an off signal is received, to the LED display unit 170, So that the LED can be operated.

When the MCU detects an error in the self-diagnosis of the heater and the ventilation performed in the MCU, the LED display unit 170 displays an operation as shown in FIG. 5, which will be described later, The LED display can be controlled to perform. In addition, when a plurality of errors are detected in the self-diagnosis, the LEDs can be turned on and off at preset intervals.

4 is a timing diagram showing the operation of a heater as an apparatus for controlling a seat member controlled by an automobile seat control apparatus according to an embodiment of the present invention.

Referring to FIG. 4, the automotive seat control apparatus receives the power B + power and receives the power B + power after a predetermined time from the power of the IGN2. Thereafter, when the driver turns on the heater switch, a high-level signal is input to the hardwire, and the input signal is input to the MCU through the voltage divider circuit and the current limiter circuit.

Thereafter, when the driver touches the heater switch once, the MCU outputs a signal of a HIGH level, a signal of a middle level when the driver touches the heater switch twice, A low level signal when the switch is touched three times, and an OFF signal when the driver touches the heater switch four times. For example, when a high-level signal is input from the MCU, a high-level signal is input to the single-channel IPS, and the IPS outputs a high-level signal to the heater to control the output of the heater on and off.

Specifically, all three LEDs (HIGH LED, MID LED, and LOW LED) are turned on so that the driver can recognize that the heater is operated at a high level when a signal of a HIGH level is input from the heater switch, Two LEDs (MID LED and LOW LED) are turned on so that the driver can recognize that the heater is operated at the middle level when a signal of the MID level is inputted, and when a signal of the LOW level is inputted One LED (LOW LED) is turned on to allow the driver to recognize that the heater is operating at a low level, and three LEDs (HIGH LED, MID LED, LOW LED) are all turned off.

When the temperature of the sheet is higher than the target temperature, the heater is turned off. If the temperature of the sheet is lower than the target temperature, the heater is turned off to keep the temperature at the level corresponding to the target temperature according to the high level, middle level and low level And this can be done by PWM control.

5 is a table for explaining the operation of the LED display unit when an MCU of the automotive seat control apparatus detects an error according to an embodiment of the present invention.

Referring to Fig. 5, the MCU of the automotive seat control apparatus can perform self-diagnosis of the heater and ventilation.

Specifically, the self-diagnosis mode performed by the MCU of the automobile seat control device includes a heater load diagnosis mode, an under temperature diagnosis mode, an NTC diagnosis mode, a ventilation load diagnosis mode, a ventilation PWM diagnosis mode, Mode, and a low voltage / overvoltage diagnostic mode.

In addition, the MCU of the vehicle seat control apparatus can output a signal for driving the LED to the LED display section to output the result of the self-diagnosis mode to the LED.

Specifically, the MCU of the automobile seat control device can output a signal for flashing all three LEDs (High LED, Mid LED, and Low LED) when there is an error in the heater load as a result of the heater load diagnosis mode And one LED (High LED) is flashed when there is an error that the heater is under temperature as a result of the under-temperature diagnosis mode, and two LEDs (Mid LED, Low LED) are turned on And a signal that turns on one LED (Mid LED) and turns off one LED (Low LED) when there is an NTC error as a result of performing the NTC diagnosis mode, flashing one LED (High LED) Can be output.

In addition, the MCU of the automotive seat control unit flashes two LEDs (High LED, Mid LED) and turns on one LED (Low LED) when there is an error in the ventilation load as a result of the ventilation load diagnosis mode And can output a signal that flashes two LEDs (High LED, Mid LED) and turns off one LED (Low LED) when there is a ventilation PWM error as a result of the ventilation PWM diagnosis mode Simultaneous ON / ON of the heater / ventilation switch Result of the diagnostic mode When the heater / ventilation switch is turned on at the same time, two LEDs (High LED, Low LED) are turned on and one LED (Mid LED) Can be output.

In addition, the MCU of the automobile seat control device flashes one LED (High LED) and turns off two LEDs (Mid LED, Low LED) when under-voltage or over-voltage is detected as a result of performing the under voltage / A signal can be output.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

100: car seat control device 110: power source part
120: Hall sensor input unit 130: Switch input unit
140: CAN communication unit 150: MCU
160: Output section 161: Motor output section
162: ventilation and heater output section 170: LED display section

Claims (12)

1. An automobile seat control device for controlling a seat comfort device of an automobile,
A CAN communication unit for performing CAN (Controller Area Network) communication with the seat device and the external device;
A hall sensor input unit receiving the position signal of the seat detected by the hall sensor;
A switch input unit receiving a switch signal of the seat member device;
An MCU receiving a signal from the CAN communication unit, the hall sensor input unit, and the switch input unit and performing predetermined logical operation;
A motor output unit for receiving a logic operation result of the MCU and outputting a signal for driving at least one function of a driving posture storing function and a lumbar support function; And a ventilation and heater output unit for receiving a logic operation result of the MCU and outputting a signal for driving at least one function of a heater function and a ventilation function, wherein, based on an output from the microcontroller unit, An output unit for outputting a driving signal for driving the apparatus to the seat member;
An LED display unit for displaying an operation state of the device of the seat based on an output from the MCU; And
And a power supply unit for supplying power to the CAN communication unit, the hall sensor input unit, the switch input unit, the MCU, the output unit, and the LED display unit. The method according to claim 1,
The apparatus of claim 1,
Wherein the vehicle seat includes at least one of an integrated memory system (IMS) function, a heater function, a lumbar support function, and a ventilation function. The method according to claim 1,
The external device includes:
An In Panel Module (IPM), a Driver Door Module (DDM), and a cluster. delete The method according to claim 1,
The power supply unit,
A plurality of power sources are received and a latch-up in which an input and an output voltage of the MCU exceed a rated voltage and a large current flows in an internal device according to an input power source to reach a failure state or an error state is determined And a regulator IC for detecting an abnormality of the MCU and resetting the MCU when an abnormality of the MCU is detected. The method according to claim 1,
The switch input unit includes:
Wherein the switch signal is input from a switch of the seat member device in a hard-wired manner, and the switch signal is input to the MCU through a reverse voltage prevention circuit and a current restriction circuit. 3. The method of claim 2,
The switch input unit includes:
And receives a signal from an NTC performing stepwise temperature control of the heater function. The method according to claim 1,
The ventilation and heater output section
And an IPS (Intelligent Power Switching) element for detecting at least one of disconnection, short-circuit and overcurrent of the ventilated load power. The method according to claim 1,
The MCU includes:
And performs a predetermined logic operation for performing a self diagnosis of the device of the seat of the automobile. 10. The method of claim 9,
The MCU includes:
In order to perform the above-mentioned self-diagnosis, the heater load diagnosis mode, the under temperature diagnosis mode, the NTC diagnosis mode, the ventilation load diagnosis mode, the ventilation PWM diagnosis mode, the heater / ventilation switch simultaneous on diagnosis mode, and the low voltage / And performs at least one mode. The method according to claim 1,
The LED display unit includes:
Turning on, turning off and flashing the LED in a predetermined manner based on the logic level of the output signal from the MCU. 11. The method of claim 10,
The LED display unit includes:
Turning on, turning off and flashing the LED in a predetermined manner corresponding to a diagnostic mode for performing self-diagnosis of the MCU.

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