KR20170004665A - Apparatus and method for implementing fail safe in motor driven power steering system - Google Patents

Abstract

The present invention provides a fail-safe apparatus and a fail-safe method in a motor-driven power steering (MDPS) system. According to an aspect of the present invention, the fail-safe apparatus in an MDPS system comprises a main battery, an auxiliary battery, a converter and a sorter. The main battery has one end connected to an alternator to be charged with power supplied from the alternator. The auxiliary battery has one end connected to one end of the main battery to be connected to the main battery in series. The converter has one end connected to the alternator and the other end connected to the other end of the auxiliary battery and charges the auxiliary battery with power supplied from the alternator. The sorter has one end connected to a motor driven steering device and the other end connected to one end of the main battery or the other end of the auxiliary battery in accordance with the converter. According to the present invention, performance of the motor can be smoothly performed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to fail safe devices and methods in an MDPS system,

The present invention relates to a fail-safe apparatus and method, and more particularly, to a fail-safe apparatus and method using a secondary battery in an electric power steering system (MDPS) to provide a higher, stable power source.

Generally, a power steering device is applied to the vehicle as a means for reducing the steering force of the steering wheel to ensure the stability of the steering state. In recent years, a power steering device such as a hydraulic power steering system (HPS) using a hydraulic pressure has been applied to a vehicle. However, in recent years, (MDPS, Motor Driven Power Steering) that makes the driver's steering effort easier by using the rotational force of the motor to implement additional functions such as vehicle safety management (VSM) and flexible steering .

Since the electric power steering system (MDPS) may cause a great risk of a deterioration in steering performance or a malfunction, stability, robustness, and the like must be guaranteed. In addition, the electric steering system is a system in which a motor-assisted steering (MDPS) motor provides steering assist power when a driver generates a steering torque by rotating the steering wheel, and motor control is essential to realize this.

At this time, the electric steering system (MDPS) operates by receiving power from a battery.

1 is a configuration diagram of a fail-safe apparatus in an MDIS system according to the prior art.

Referring to FIG. 1, the fail safe device according to the related art includes an alternator 10 connected to one end of a battery 20 to charge the battery 20 at startup, an alternator 10, A battery 20 connected between the MDPS 30 and the battery 20 to supply electric power charged from the alternator 10 to the electric steering system MDPS 30, (MDPS) 30 for reducing the steering force of the steering wheel to ensure the stability of the steering condition. At this time, the battery 20 is a battery 20 having a voltage of 12V.

As described above, in the related art, the battery 20 having a voltage of 12V is directly connected to the electric power steering system (MDPS) 30 to supply electric power directly to the electric power steering system (MDPS) 30. Accordingly, the electric power steering system (MDPS) 30 is continuously supplied with power from the battery 20 and has no problem in controlling the fail-safe function internally. However, when an active steering system (AFS) that varies the steering gear ratio according to the running state of the vehicle is applied to the electric power steering system (MDPS) 30 as in the related art, the electric steering system MDPS, It is difficult to properly realize the motor performance of the motor 30. Accordingly, the driver can sense a sense of heterogeneity when operating the vehicle handle while driving or operating the vehicle.

Korean Published Patent No. 2011-0080757 (Published on July 13, 2011)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide an electric power steering system, And an object thereof is to provide a fail-safe apparatus and method in a system.

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

According to an aspect of the present invention, there is provided a fail-safe apparatus in an MDPS system, including: a main battery having one end connected to an alternator and charging power from the alternator; An auxiliary battery having one end connected to the one end of the main battery and connected in series with the main battery; A converter having one end connected to the alternator and the other end connected to the other end of the auxiliary battery to charge the auxiliary battery with power supplied from the alternator; And a classifier having one end connected to the electric steering apparatus and the other end connected to the one end of the main battery or the other end of the auxiliary battery under the control of the converter.

Wherein the converter connects the other end of the classifier to the other end of the auxiliary battery when the voltage at the other end of the auxiliary battery is the sum of the voltages of the main battery and the auxiliary battery, To the device.

The converter determines that the classifier is faulty if the voltage at the one end of the classifier is smaller than the sum of the voltages of the main battery and the auxiliary battery and transmits the fault information to the electric power steering apparatus.

The converter determines that the classifier is in a normal state when the voltage at the one end of the classifier is the sum of the voltages of the main battery and the auxiliary battery, and transmits the normal information to the electric power steering apparatus.

Wherein the converter connects the other end of the classifier to the one end of the main battery when the voltage at the other end of the auxiliary battery is smaller than the sum of the voltages of the main battery and the auxiliary battery, To the electric steering system.

According to another aspect of the present invention, there is provided a battery pack comprising: a main battery connected to an alternator to charge a power source from the alternator; An auxiliary battery having one end connected to the one end of the main battery and connected in series with the main battery; A converter having one end connected to the alternator and the other end connected to the other end of the auxiliary battery; And a classifier having one end connected to the electric power steering apparatus and the other end connected to the one end of the main battery or the other end of the auxiliary battery, the fail safe method in the fail safe device comprises the steps of: Charging the auxiliary battery with power supplied thereto; And connecting the other end of the classifier to the one end of the main battery or the other end of the auxiliary battery based on the voltage of the other end of the auxiliary battery.

And connecting the other end to the other end of the auxiliary battery when the voltage at the other end of the auxiliary battery is the sum of the voltages of the main battery and the auxiliary battery do.

The method includes the steps of: the converter verifying the voltage at the one end of the classifier; If the voltage of the one end of the classifier is smaller than the sum of the voltages of the main battery and the auxiliary battery, the converter judges that the classifier is faulty and transmits the fault information to the electric steering apparatus .

The method includes the steps of: when the voltage at the one end of the classifier is the sum of the voltages of the main battery and the auxiliary battery, the converter determines that the classifier is in a steady state and transmits normal information to the electric steering apparatus ; ≪ / RTI >

Connecting the other end of the classifier to the one end of the main battery when the voltage at the other end of the auxiliary battery is less than the sum of the voltages of the main battery and the auxiliary battery; .

The method further includes the step of the converter transmitting connection information of the other end of the classifier to the electric steering apparatus.

According to an aspect of the present invention, a voltage of 24V is supplied to the electric steering system (MDPS) to smooth the performance of the motor, thereby reducing the sense of heterogeneity that the driver feels when operating the steering wheel.

In addition, an electronic control unit (ECU) of an electric power steering system (MDPS) may be used to check whether the classifier is malfunctioning by using a converter that charges the auxiliary battery, information on the voltage value or current value of the battery, So that the electric power is supplied to the electric power steering system (MDPS) even in an emergency, so that the driver can stably operate the vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention. And should not be construed as limiting.
FIG. 1 is a configuration diagram of a fail-safe device in an MDIS system according to the related art,
FIG. 2 is a configuration diagram of a fail-safe apparatus in an MDIS system according to an embodiment of the present invention;
Fig. 3 is a configuration diagram of a fail-safe apparatus showing a more detailed configuration of the converter of Fig. 2,
FIG. 4 is a flowchart illustrating an operation flow of a fail-safe apparatus in an MD system during an initial start of a vehicle according to an embodiment of the present invention;
5 is a flowchart illustrating an operation flow of a fail-safe apparatus in an MDMS system when a vehicle is operated according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims are to be construed in accordance with the technical idea of the present invention based on the principle that the concept of a term can be properly defined in order to describe its own invention in the best way It must be interpreted as meaning and concept. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

In the following description of the present invention, a 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.

2 is a block diagram of a fail-safe apparatus in an MDIS system according to an embodiment of the present invention.

2, the fail-safe apparatus includes a main battery 100, an auxiliary battery 200, an alternator 300, a converter 400, a classifier 500, and an electric power steering (MDPS) (600).

The main battery 100 is charged by the alternator 300 at the start of the vehicle, and supplies power to the electric steering system (MDPS) 600 with a voltage of 12V. The main battery 100 can supply electric power to the MDPS 600 even if the classifier 500 is not operated. That is, basically, the classifier (switching device) 500 connects the main battery 100 and the MDPS 600, so that even if the classifier 500 does not operate normally, And supplies electric power to an electric power steering (MDPS) 600.

The auxiliary battery 200 is connected in series with the main battery 100 and supplies power with a voltage of 24 V to the MDPS 600 together with the main battery 100. The auxiliary battery 200 is charged by the converter 400 at the start of the vehicle. When the converter 400 determines that the classifier 500 is in a normal state, the classifier (switching device) 500 is connected to the auxiliary battery 200 and the electric power steering system (MDPS) 600 by the converter 400, So that the main battery 100 and the auxiliary battery 200 connected in series supply power having a voltage of 24 V to the electric power steering system (MDPS) 600.

The alternator 300 is connected to one end of the main battery 100 to charge the main battery 100.

The converter 400 is connected to one end of the auxiliary battery 200 to charge the auxiliary battery 200. The converter 400 may be connected to an ignition (IGN) power source when the vehicle is started.

The converter 400 periodically checks the main battery 100 and the auxiliary battery 200 to determine voltage value and current value information. At this time, the converter 400 transmits the information to the electronic control unit (MDPS-ECU) 610 of the electric power steering apparatus to share the information. The transmission of the information can be performed through CAN (Controller Area Network) communication.

The converter 400 switches the classifier 500 to supply only the power of the main battery 100 to the electric steering system MDPS 600 or the sum of the main battery 100 and the auxiliary battery 200 Can be supplied. That is, the converter 400 switches and controls the classifier 500 to supply a power having a voltage of 12V of the main battery 100 to the MDPS 600, It is possible to supply a power source having a voltage of 24 V, which is the sum of the power sources of the battery 200.

The converter 400 checks the power stage located between the classifier 500 and the MDPS 600. That is, the converter 400 checks the output voltage of the classifier 500. At this time, the converter 400 may check the power terminal to determine whether the classifier 500 is malfunctioning. That is, when the voltage value is 24V, the converter 400 determines that the classifier 500 is normal. When the voltage value is 12V, the converter 400 can determine that the classifier 500 is broken. Accordingly, when the classifier 500 is judged to be normal, the converter 400 connects the one end of the auxiliary battery 200 and the MDPS 600 to the electric power steering system MDPS 600, A power supply having a voltage of 24 V which is the sum of the power of the auxiliary battery 200 and the power supply of the main battery 100 is supplied to the main battery 100. When it is determined that the classifier 500 is broken, 600 may be connected to the MDPS 600 to supply the main battery 100 with a voltage of 12V.

At this time, the converter 400 can transmit the operation state information of the classifier 500 to the electronic control unit (MDPS-ECU) 610 of the electric steering system via CAN (Controller Area Network) communication.

When the converter 400 operates normally, the classifier 500 can be controlled and processed as described above, but if the converter 400 fails, the classifier 500 can not be controlled. When the converter 400 malfunctions, the auxiliary battery 200 is charged and discharged, so that the auxiliary battery 200 and the main battery (not shown) are connected to the MDPS 600, 100), which is the sum of the power of the power supply of 100 V, Therefore, in order to cope with such a situation, the converter 400 checks the voltage value and / or the current value of the battery and sends it to the MDPS-ECU 610 to share information. In addition, the operation state information of the classifier 500 is sent to the MDPS-ECU 610 to share information. At this time, the sharing of the information can be performed through CAN (Controller Area Network) communication. Accordingly, the MDPS-ECU 610 determines whether or not the MDPS-ECU 610 is operating based on the state information of the vehicle (for example, the steering ability degradation of the steering wheel), the voltage value and / or the current value information of the battery, The power of the main battery 100 can be supplied to the MDPS 600 by controlling the classifier 500 even if the converter 400 fails.

The classifier 500 is a switching element, for example a relay, located between the two batteries (main battery 100 and auxiliary battery 200) and electric power steering (MDPS) 600. At this time, the classifier (switching device) 500 basically connects the main battery 100 and the electric power steering device, and supplies power having a voltage of 12V to the MDPS 600. The classifier 500 is connected to a power source having a voltage of 12V of the main battery 100 or a power source having a voltage of 24V which is the sum of the main battery 100 and the auxiliary battery 200, (The main battery 100 and the auxiliary battery 200 are connected in series) to the electric power steering system MDPS. That is, the classifier 500 can be controlled by the converter 400. When the converter 400 checks the state of charge of the auxiliary battery 200 and determines that the state is normal, the classifier (switching device) And connects one end of the auxiliary battery 200 to the electric power steering (MDPS) 600. Accordingly, the MDPS 600 is connected to the main battery 100 and the auxiliary battery 200 in a voltage of 24V (the main battery 100 and the auxiliary battery 200 are connected in series) May be supplied with power.

(MDPS) 600 is connected to the other end of the classifier (switching device) 500, and is capable of reducing harmful substances, improving fuel economy, improving assemblability, and providing parking assist system (SPAS), vehicle safety management (VSM) It is a device that makes the driver's steering force easier by using the torque of the motor to implement additional functions such as steering (Flexible Steering). The electric power steering (MDPS) 600 may include an electronic control unit (ECU) 610 that communicates with the converter 400 via CAN (Controller Area Network) have. At this time, the information may be current value and / or voltage value information of the main battery 100 and the auxiliary battery 200, state information of the vehicle, operation state information of the converter 400, and the like.

Fig. 3 is a configuration diagram of a fail-safe apparatus showing a more detailed configuration of the converter of Fig. 2;

In the description of FIG. 3, description of the same components as those of FIG. 2 will be omitted. In the present embodiment, a detailed configuration of the converter of FIG. 2 will be described.

In explaining the present embodiment, the converter 400 operates in connection with the IGN power supply when the vehicle is started.

3, the converter 400 according to the embodiment of the present invention includes a transformer 440 for separating the ground of the main battery 100 from the ground of the auxiliary battery 200 and electrically insulated from each other, And the output side. The input side may include a PWM unit 410, a main processor (primary MCU) 420, and a classifier control unit (drive circuit) 430. The output unit may include a rectification unit 450, A secondary MCU 460, a feedback unit 470, and a charging unit 480. [

In the description of the present embodiment, the main processor 420 controls the input side components as a whole, and the auxiliary processor 460 controls the output side components as a whole.

First, the components on the input side will be described as follows.

The main processor 420 operates the PWM unit 410 to supply power to the output side through the transformer 440 to charge the auxiliary battery 200. For example, the main processor 420 may receive the charging status information of the auxiliary battery 200 from the feedback unit 470, and if the charging status of the auxiliary battery 200 is not good, the PWM unit 410 To supply the input power to the output side through the transformer 440 to charge the auxiliary battery 200.

The main processor 420 periodically checks the voltages of the main battery 100 and the auxiliary battery 200 to check whether the batteries are normal. The main processor 420 can check the voltages of the main battery 100 and the auxiliary battery 200 separately or check the normal state of the batteries through the sum of the voltages of the two batteries. If the sum of the voltages of the auxiliary battery 200 and the main battery 100 is equal to 24V, the main processor 420 operates the classifier controller 430 Signal to control the classifier 500 to switch.

In addition, the main processor 420 can check the operating state of the classifier 500 by checking a power terminal located between the classifier 500 and the MDPS 600. For example, if the output voltage is 24V, the main processor 420 determines that the classifier 500 is normal. If the output voltage is 12V, the main processor 420 determines that the classifier 500 is broken. At this time, the main processor 420 may transmit the information to the MDPS-ECU through CAN (Controller Area Network) communication. Accordingly, the electric power steering system (MDPS) 600 can determine whether the vehicle is to be operated in a normal mode or in a warning mode based on the information and inform the driver of the vehicle status.

When the auxiliary battery 200 is charged, the PWM unit 410 operates the main processor 420 to transmit the input power to the transformer 440.

The classifier controller 430 may be controlled by the main processor 420 and may transmit a control signal to the classifier 500. That is, the classifier control unit 430 transmits a switching control signal to the classifier 500 to supply power to the main battery 100 of the main battery 100 or the power supply of the main battery 100 to the electric power steering unit (MDPS) It is possible to supply a power source having a voltage of 24V which is the sum of the power sources of the auxiliary battery 200. [

Next, the components on the output side will be described as follows.

The auxiliary processor 460 measures the charging current and / or the charging voltage of the auxiliary battery 200 and checks the charging and discharging states of the auxiliary battery 200. [ At this time, if the auxiliary processor 460 determines that the voltage of the auxiliary battery 200 is not sufficient, the auxiliary processor 460 may charge the auxiliary battery 200 by controlling the charging unit 480. [ For example, when the voltage of the auxiliary battery 460 is not sufficient as a result of measuring the charging current and / or the charging voltage of the auxiliary battery 200, the auxiliary processor 460 sends a control signal to the charging unit 480, The auxiliary battery 200 can be charged with the power that is rectified through the auxiliary battery 200.

The rectifier 450 rectifies the AC power received through the transformer 440 to have a constant DC value. The DC power of the rectifying unit 450 is supplied to the auxiliary battery 200 under the control of the charging unit 480 to charge the auxiliary battery 200.

The feedback unit 470 transmits the state of charge of the auxiliary battery 200 checked by the auxiliary processor 460 to the main processor 420.

The charging control unit 480 is controlled by the auxiliary processor 460. Upon receiving the control signal related to the charging of the auxiliary battery 200 from the auxiliary processor 460, the charging unit 480 receives the rectified power through the rectifier, And supplies the auxiliary battery 200 with the auxiliary battery 200 to charge the auxiliary battery 200.

4 is a flowchart illustrating an operation flow of a fail-safe apparatus in an MD system at the time of initial start of a vehicle according to an embodiment of the present invention.

4, components of the fail-safe device in the MDPS system have been described with reference to FIG. 2, so that a detailed description related to the configuration will be omitted.

The operation flow of the fail safe device in the MDP system at the initial start of the vehicle will be described with reference to FIG.

First, the converter 400 is operated in connection with the IGN power supply at the start of the vehicle (S410). The converter 400 may check the voltage of the main battery 100 and the auxiliary battery 200 to check the current value and voltage value information and transmits the information to the MDPS-ECU 610 in operation S420.

When the voltage of the auxiliary battery 200 is determined to be normal (for example, the voltage of the auxiliary battery 200 is 12 V, the voltage of the auxiliary battery 200 and the voltage of the main battery 100) The power supply of 24 V, which is the sum of the voltage of the auxiliary battery 200 and the voltage of the main battery 100, is supplied to the electric power steering system (MDPS) 600 so as to switch the classifier 500 (S430) (S440). That is, the converter 400 may be configured such that one end of the auxiliary battery 200 is connected to the MDPS 600 so that a power source having a voltage of 24V can be supplied to the MDPS 600 The classifier 500 can be controlled for switching.

Thereafter, the converter 400 checks a power source located between the classifier 500 and the MDPS 600 (S450). The reason for checking the power supply end as described above is to confirm whether or not the classifier 500 operates normally. That is, the converter 400 checks the voltage of the power supply terminal and determines that the classifier 500 operates normally when the value is 24 V, which is the sum of the power of the auxiliary battery 200 and the power of the main battery 100 , The state information of the classifier 500 may be transmitted to the MDPS-ECU 610 (S460). However, when the voltage of the power source of the converter 400 is 12 V, the classifier 500 may determine that the classifier 500 is in an abnormal operation, that is, a malfunction. If the status information of the classifier 500 is MDPS- To the ECU 610 (S470).

However, if the auxiliary battery 200 is judged to be abnormal when the voltage of the auxiliary battery 200 is measured (for example, the voltage of the auxiliary battery 200 is 12V It is possible to maintain the same state without switching the classifier 500 so that the power of the main battery 100 can be supplied to the MDPS 600, To the MDPS-ECU 610 (S435).

The converter 400 may provide the voltage and / or current value information of the battery, the operating state information of the classifier 500, and the like to the electronic control unit (MDPS) 600 of the electric power steering system (MDPS) (ECU) 610, so that the electric power steering (MDPS) 600 does not need to check the power of the battery separately. Therefore, the MDPS-ECU 610 can quickly perform the steering setting, thereby alleviating the possibility of disturbing the steering wheel.

5 is a flowchart illustrating an operation flow of a fail-safe apparatus in an MDMS system when a vehicle is operated according to an embodiment of the present invention.

In the description of FIG. 5, components of the fail-safe device in the MDPS system have been described with reference to FIG. 2, so a detailed description of the configuration will be omitted.

The operation flow of the fail-safe device in the MDPS system when the vehicle is traveling will be described with reference to FIG.

After the initial start of the vehicle, one end of the auxiliary battery 200 and the MDPS 600 are connected by the classifier 500 to the sum of the voltages of the auxiliary battery 200 and the main battery 100 It is assumed that the power source 24V is being supplied to the electric steering system (MDPS)

First, the converter 400 checks the state of charge of the auxiliary battery 200 (S510). At this time, when the converter 400 determines that the auxiliary battery 200 is charged abnormally (for example, the measured voltage is less than 12 V), the converter 400 transmits the information to the MDPS- So that the power of the main battery 100 (12V) is supplied to the electric steering system (MDPS) 600 (S520).

However, if it is determined that the auxiliary battery 200 is charged normally, the converter 400 checks whether the classifier 500 operates normally (S530). That is, the converter 400 checks the power supply end located between the classifier 500 and the MDPS 600. If the voltage value is 24 V, the converter 400 determines that the classifier 500 is normal, The power supply having the sum of the voltages of the battery 200 and the main battery 100 is supplied to the MDPS 600 and the state information of the classifier 500 can be transmitted to the MDPS- (S540). However, the converter 400 checks the power supply end located between the classifier 500 and the MDPS 600 and determines that the classifier 500 has failed if the voltage value is 12V, 500) to the MDPS-ECU 610 (S550). At this time, when the fault occurs, the classifier 500 is automatically switched to connect the main battery 100 and the MDPS 600 to the main battery 100, Is supplied to the electric power steering (MDPS) 600.

In driving the motor of the electric power steering system (MDPS) 600, the auxiliary battery 200 is connected in series to the main battery 100 to supply a power having a voltage of 24 V to the MDPS, It is possible to make the feeling of heterogeneity less noticeable. However, when the auxiliary battery 200 is discharged, power is not properly supplied to the MDPS 600, so that when the voltage becomes unstable, the driver may sense a sense of heterogeneity in operating the steering wheel of the vehicle. Accordingly, when the auxiliary battery 200 is abnormal due to a discharge or the like as described above, the power of the main battery 100 (12V) can be supplied to the electric power steering system (MDPS) 600 to prepare for an emergency. At this time, since the voltage of the main battery 100 is lower than the voltage of the auxiliary battery 200, the motor of the electric power steering system (MDPS) 600 has a steering feeling on the steering wheel more than when the power having the voltage of 24V is supplied It can fall. However, as the constant voltage of the main battery 100 (12V) is supplied in an emergency, the motor of the electric power steering system (MDPS) 600 operates according to a steering steering algorithm set in an emergency, It is less likely to feel a sense of heterogeneity.

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 exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100: Main battery
200: auxiliary battery
300: alternator
400: Converter
410: PWM section
420: main processor
430:
440: Transformer
450: rectification part
460: coprocessor
470:
480:
500: classifier
600: Electric steering (MDPS)
610: Electronic control unit

Claims (11)

A main battery connected to the alternator once to charge the power source from the alternator;
An auxiliary battery having one end connected to the one end of the main battery and connected in series with the main battery; And
A converter having one end connected to the alternator and the other end connected to the other end of the auxiliary battery to charge the auxiliary battery with power supplied from the alternator; And a classifier having one end connected to the electric steering apparatus and the other end connected to the one end of the main battery or the other end of the auxiliary battery under the control of the converter. The method according to claim 1,
The converter includes:
When the voltage of the other end of the auxiliary battery is the sum of the voltages of the main battery and the auxiliary battery, connects the other end of the classifier to the other end of the auxiliary battery and transmits information about the other end to the electric steering device Fail safe device. 3. The method of claim 2,
The converter includes:
Wherein when the voltage of the one end of the classifier is smaller than the sum of the voltages of the main battery and the auxiliary battery, it is determined that the classifier is faulty and the fault information is transmitted to the electric power steering apparatus. The method of claim 3,
The converter includes:
Wherein when the voltage of the one end of the classifier is the sum of the voltages of the main battery and the auxiliary battery, the classifier is determined to be in a steady state and the normal information is transmitted to the electric power steering apparatus. 5. The method according to any one of claims 1 to 4,
The converter includes:
And the other end of the classifier is connected to the one end of the main battery when the voltage of the other end of the auxiliary battery is smaller than the sum of the voltages of the main battery and the auxiliary battery, Fail safe device. A main battery connected to the alternator once to charge the power source from the alternator; An auxiliary battery having one end connected to the one end of the main battery and connected in series with the main battery; A converter having one end connected to the alternator and the other end connected to the other end of the auxiliary battery; And a classifier having one end connected to the electric power steering apparatus and the other end connected to the one end of the main battery or the other end of the auxiliary battery, the fail-
Charging the auxiliary battery with power supplied from the alternator; And
And connecting the other end of the classifier to the one end of the main battery or the other end of the auxiliary battery based on the voltage of the other end of the auxiliary battery. The method according to claim 6,
Wherein the step of connecting to the other end comprises:
And connecting the other end of the classifier to the other end of the auxiliary battery when the voltage at the other end of the auxiliary battery is the sum of the voltages of the main battery and the auxiliary battery . 8. The method of claim 7,
Wherein the converter is configured to verify the voltage at the one end of the classifier;
If the voltage of the one end of the classifier is smaller than the sum of the voltages of the main battery and the auxiliary battery, the converter judges that the classifier is faulty and transmits the fault information to the electric steering apparatus Fail safe method. 9. The method of claim 8,
If the voltage of the one end of the classifier is the sum of the voltages of the main battery and the auxiliary battery, the converter judges the classifier as a steady state and transmits normal information to the electric steering apparatus Wherein the fail safe method comprises the steps of: 10. The method according to any one of claims 6 to 9,
Wherein the step of connecting to the other end comprises:
And connecting the other end of the classifier to the one end of the main battery when the voltage at the other end of the auxiliary battery is smaller than the sum of the voltages of the main battery and the auxiliary battery Safe way. 10. The method according to any one of claims 6 to 9,
Further comprising the step of the converter transmitting connection information of the other end of the classifier to the electric power steering apparatus.

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