KR101548923B1 - Electronic control unit and voltage drop perception method for electronic control unit - Google Patents

Abstract

There is disclosed an electronic control apparatus capable of safely operating an electronic control apparatus by effectively detecting / judging an abnormal voltage drop occurring in the power supply of the vehicle electronic control apparatus and restarting the system, and a voltage drop detection method of the electronic control apparatus. An electronic control device of the present invention includes: a power supply device that rectifies and supplies power from a battery to a predetermined voltage level; and a control unit that is driven using the power supply of the voltage level provided from the power supply device, Determining whether a predetermined reset boundary time has elapsed when a voltage drop of the power supply is below a predetermined threshold voltage level and determining whether a voltage of the power source whose voltage has dropped before the reset boundary time elapses exceeds a predetermined debounce time Lt; RTI ID = 0.0 > state < / RTI >

Power, Unstable, Reset, Voltage Drop

Description

TECHNICAL FIELD [0001] The present invention relates to an electronic control device and a voltage drop detection method for an electronic control device,

The present invention relates to an electronic control device, and more particularly, to an electronic control device capable of safely operating an electronic control device by effectively detecting / determining an abnormal voltage drop occurring in power supply of an automotive electronic control device and restarting the system, To a voltage drop sensing method of an electronic control unit.

 2. Description of the Related Art In general, an electronic control unit (ECU) for a vehicle includes a power supply, a microcontroller, and a memory. The power supply of the electronic control unit converts the 12V power from the battery to the voltage level necessary for other circuits in the electronic control unit. That is, the power supply converts the power from the battery to the voltage level required by the microcontroller and provides it to the microcontroller.

The power supply situation inside the vehicle changes very dynamically according to the operation state of the vehicle, and the power supply situation inside the vehicle is unstable, so that the operation of the power supply device of the electronic control device may become unstable. Accordingly, a voltage drop may occur in a voltage of a power supply provided to the microcontroller by the power supply of the electronic control unit due to an external or internal factor. When such a voltage drop occurs, conventionally, debug information, etc.) and immediately restart the software by resetting the system.

As described above, since the conventional voltage drop method in the electronic control unit responds to various kinds of voltage drop occurring in the vehicle only by immediate system restart, if the power supply is unstable even after the restart, A normal operation state can not be guaranteed. Accordingly, even if the start routine of the software of the electronic control unit (ECU) fails and is put into an inoperable state, or even if the start-up is successful, the imperfect instruction execution causes damage to the electronic control unit (ECU) You may. Particularly, when data is stored in the flash memory immediately after the start-up, if the write operation due to power instability during recording fails, the data is invalidated or, at worst, the program memory is destroyed and the electronic control unit It can not be done.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a power supply device for rectifying and supplying power from a battery to a predetermined voltage level, Wherein the control unit determines whether a predetermined reset boundary time has elapsed when a voltage supplied from the power supply unit drops below a predetermined threshold voltage level and before the reset boundary time elapses And a microcontroller for restarting the system when the voltage of the power source is maintained at a normal voltage state for a predetermined debounce time or longer. The present invention provides an electronic control device comprising: The electronic control device can be safely detected It is to start.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a power supply apparatus and a method of driving the same, which is driven by using a power supply of the voltage level provided from a power supply apparatus for rectifying power from a battery to a predetermined voltage level Detecting a voltage drop in which the power supplied from the power supply unit drops below a predetermined limit voltage level; determining whether a predetermined reset boundary time has elapsed when the voltage drop is detected; Detecting whether a voltage of the power source whose voltage has been lowered returns to a normal voltage state before the reset boundary time elapses; and when the power source is detected as a normal voltage state, Determining whether the steady voltage state is maintained during a set debounce time; And a step of restarting the system when it is determined that the power source is maintained in the normal voltage state during the elapse of the service time, And to operate the electronic control unit safely by effectively detecting / judging the drop and restarting the system.

According to a first aspect of the present invention, there is provided an electronic control apparatus comprising: a power supply device for rectifying and supplying power from a battery to a predetermined voltage level; And a controller for determining whether or not a predetermined reset boundary time has elapsed when the voltage supplied from the power supply apparatus drops below a predetermined threshold voltage level And a microcontroller for restarting the system when the voltage of the power source whose voltage has been lowered before the reset boundary time has lapsed to a steady voltage state for more than a predetermined debounce time.

Advantageously, the microcontroller is capable of restarting the system when the reset boundary time has elapsed with the voltage provided by the power supply being dropped below a predetermined threshold voltage level.

According to a second aspect of the present invention, there is provided a method of detecting a voltage drop in an electronic control device, the method comprising: using a power source of the voltage level provided from a power supply for rectifying power from a battery to a predetermined voltage level A driving step; Detecting a voltage drop in which the power provided by the power supply drops below a predetermined threshold voltage level; Determining whether a predetermined reset boundary time has elapsed when the voltage drop is detected; Detecting whether a voltage of the power source whose voltage has dropped before the reset boundary time elapses returns to a normal voltage state; Determining whether the power supplied from the power supply unit is maintained in the steady-state voltage for a predetermined debounce time period when the power source is detected as a normal voltage state; And restarting the system if it is determined that the power source remains in the steady-state voltage state for the elapse of the debounce time.

The method may further include restarting the system when the reset boundary time has elapsed as a result of determining whether or not the reset boundary time has elapsed as a result of a voltage drop of the power provided from the power supply apparatus.

Preferably, if it is determined that the power source is maintained in a normal voltage state during the elapse of the debounce time, if the power source is not maintained in a normal voltage state before the debounce time elapses, The step of judging whether or not the elapsed time has elapsed can be continued.

Storing the minimum information required to restart the system when the voltage drop is detected; And entering the preset predetermined low power mode.

According to the voltage drop detection method of the electronic control apparatus and the electronic control apparatus of the present invention, when a voltage drop is detected in the power supply from the power supply apparatus inside the electronic control apparatus, Or by resetting the software and restarting the system stably when the power supply from the power supply remains at the normal voltage state for the debounce time before the reset boundary time has elapsed so that the power supply in the power supply controller malfunctions The system can be restarted after determining that it is a voltage drop or a voltage drop due to a temporary power supply condition that has affected the power supply.

Thus, according to the voltage drop detection method of the electronic control apparatus and the electronic control apparatus of the present invention, it is possible to perform the processing for the voltage drop in the conventional electronic control apparatus that immediately restarts the system without judging the various kinds of voltage drop occurring in the vehicle And after restarting the system after determining that the voltage drop is caused by an abnormal voltage drop due to a malfunction of the power supply device in the power supply control device or a temporary power supply condition that has affected the power supply device, It is possible to effectively detect / judge the abnormal voltage drop occurring in the power supply of the power supply unit and to restart the system.

Hereinafter, an embodiment of an electronic control apparatus according to the present invention will be described with reference to FIG.

An electronic control unit (ECU) 100 of the present invention includes a power supply unit 20, a microcontroller 30, and a memory 40 as shown in FIG.

The power supply unit 20 rectifies the power supplied from the external battery 10 to a predetermined voltage level suitable for each circuit unit in the electronic control unit 100. [ That is, the microcomputer 30 and the memory 40 supply power to the microcontroller 30 and the memory 40, respectively, which are rectified to the voltage levels required by the microcontroller 30 and the memory 40, respectively.

Here, the means for informing the microcontroller 30 that the power supply operation of the power supply device 20 becomes unstable as the power supply condition becomes unstable and the voltage level of the power supplied to the microcontroller 30 can not be adjusted You will need it. In order to inform the power supply device 20 whether or not the voltage is dropped below a predetermined limit voltage level of the power supplied to the microcontroller 30, the power supply device 20 is provided with a 5V_RST signal terminal, And provides a signal to the microcontroller 30. Of course, it is of course possible to adopt any of various methods of notifying the microcontroller 30 that the voltage level of the power supplied to the microcontroller 30 can not be adjusted in addition to the 5V_RST signal terminal.

The memory 40 stores various data required for driving and operating the microcontroller 30 and data recorded according to the operation of the microcontroller 30.

The microcontroller 30 is driven by using the power supply of the voltage level provided from the power supply device 20 and when the power supplied from the power supply device 20 drops in voltage below a predetermined limit voltage level, Determines whether the reset boundary time has elapsed, and restarts the system if the voltage of the voltage-dropped power source remains at the steady voltage state for more than a predetermined debounce time before the reset boundary time elapses.

The microcontroller 30 may use the power supply of the voltage level provided from the power supply unit 20 or the power supply of the normal voltage state required for the microcontroller 30 to operate Drive / operate.

The microcontroller 30 senses whether or not the power supplied from the power supply unit 20 has a voltage drop below a predetermined threshold voltage level. For example, the microcontroller 30 continuously monitors the 5V_RST signal provided from the power supply 20, and when the 5V_RST signal drops in voltage by a predetermined value at a voltage of 5V, it is supplied from the power supply 20 It can be determined that the voltage of the power source in the steady-state voltage is lowered to the predetermined limit voltage level or lower. Of course, the microcontroller 30 directly monitors the voltage of the power supply in the steady-state voltage provided from the power supply device 20 so that the power of the steady-state voltage provided from the power supply 20 is at a predetermined threshold voltage level or lower Such as by sensing whether a voltage drop is present in the voltage drop across the device.

If the 5V_RST signal senses that the voltage of the steady-state voltage supplied from the power supply 20 drops to a predetermined limit voltage level or lower, for example, the voltage drops by a predetermined value at the 5V voltage, the microcontroller 30 , It is determined whether or not a predetermined reset boundary time T1 has elapsed in a voltage-lowered state.

Here, the microcontroller 30 sets the minimum information (for example, a debug information record or the like) required to restart the system at a later time before determining whether or not the predetermined reset boundary time T1 has elapsed in a voltage drop state . This is because the data read from the memory 40 can not be relied upon from when the voltage drop to the power supply in the normal voltage state provided from the power supply unit 20 is sensed, . Therefore, the minimum required software must be stored in advance in the RAM of the microcontroller 30 so that the RAM of the microcontroller 30 can perform the subsequent operation immediately after the voltage drop is detected.

It is also preferable that the microcontroller 30 enters a preset predetermined low power mode before determining whether or not a predetermined reset boundary time has elapsed in a voltage lowered state. This is because the electronic control apparatus 100 can use only a limited amount of electric power that the electronic control apparatus 100 can utilize from the time when a voltage drop to a power supply of a normal voltage state provided from the power supply apparatus 20 is sensed This is because it is necessary to complete the subsequent operation while consuming a minimum amount of power. Accordingly, immediately after the voltage drop is detected, the microcontroller 30 enters predetermined predetermined low power mode (e.g., sleep mode, operation frequency lowering, etc.) to minimize the operating power.

As described above, the microcontroller 30 determines whether or not the predetermined reset boundary time T1 has elapsed in a state in which the power of the steady-state voltage supplied from the power supply unit 20 is dropped to a predetermined limit voltage level or lower . That is, the microcontroller 30 starts counting the reset boundary time T1 from the voltage drop point.

Here, the microcontroller 30 continuously detects whether or not the voltage of the power source whose voltage has been lowered returns to the normal voltage state before the reset boundary time T1 elapses. The fact that the voltage of the voltage-dropped power supply returns to the normal voltage state before the reset boundary time T1 has elapsed is due to a temporary noise return or a temporary power supply situation that has affected the power supply 20 This means that instability has been resolved. Here, sensing whether or not to return to the normal voltage state will correspond to a method of detecting the above-described voltage drop.

If the normal voltage state is detected as the voltage-dropped power supplied from the power supply unit 20 returns to the normal voltage state before the reset boundary time T1 elapses, the microcontroller 30 sets It is determined whether the power from the power supply device 20 is maintained in the normal voltage state during the elapse of the debounce time T2.

Accordingly, if it is determined that the power from the power supply device 20 is maintained in the normal voltage state during the elapse of the debounce time T 2, the instability of the temporary power supply condition that affects the power supply device 20 The microcontroller 30 resets the software and restarts the system in a stable manner.

On the other hand, if the power from the power supply device 20 is not maintained in the normal voltage state before the debounce time T2 elapses and the voltage drops again, the microcontroller 30 returns to the normal voltage state, It is ignored and continues to determine whether the reset boundary time T1 counted in the foregoing is over.

Accordingly, when the predetermined reset boundary time T1 elapses in a voltage drop state, the microcontroller 30 determines that the abnormal voltage is due to a malfunction of the power supply 20, resets the software, Restart.

As described above, according to the power control apparatus 100 according to the present invention, when a voltage drop is detected from the power supply 20, if the reset boundary time T1 elapses in a voltage drop state, Or by restarting the system reliably by resetting the software when the power from the power supply 20 remains at the normal voltage state during the debounce time T2 before the reset boundary time T1 has elapsed, It is possible to restart the system after determining that the abnormal voltage is caused by a malfunction of the power supply 20 in the apparatus 100 or a voltage drop due to the temporary power supply condition that has affected the power supply 20. [

Therefore, according to the power supply control apparatus 100 according to the present invention, the problem of the conventional voltage reduction method in the electronic control apparatus that immediately restarts the system without judging the various kinds of voltage drop occurring in the vehicle can be solved It is determined that the abnormal voltage is caused by a malfunction of the power supply device 20 in the power supply control device 100 or a voltage drop due to a temporary power supply condition that has affected the power supply device 20 and then the system is restarted It is possible to effectively detect / judge the abnormal voltage drop occurring in the power supply of the vehicle electronic control apparatus 100 and to restart the system.

It would be desirable to apply the power control apparatus 100 to the dual-power system described above.

Hereinafter, a control flow of the voltage drop detection method corresponding to the electronic control apparatus 100 constructed as described above according to the present invention will be described with reference to FIG. Here, for convenience of description, the components shown in FIG. 1 will be described with reference to corresponding reference numerals.

First, the microcontroller 30 in the electronic control unit 100 controls the voltage level of the power supplied from the power supply unit 20 that rectifies the power from the battery 10 to a predetermined voltage level, that is, (Step S10).

Here, the voltage drop detection method of the electronic control device 100 according to the present invention detects whether the voltage supplied from the power supply device 20 to the microcontroller 30 drops below a predetermined threshold voltage level (S10). For example, the microcontroller 30 continuously monitors the 5V_RST signal provided from the power supply 20, and when the 5V_RST signal drops in voltage by 5V, It can be determined that the power source in the voltage state is dropped to a voltage lower than a predetermined threshold voltage level. Of course, the microcontroller 30 directly monitors the voltage of the power supply in the steady-state voltage provided from the power supply device 20 so that the power of the steady-state voltage provided from the power supply 20 is at a predetermined threshold voltage level or lower Such as by sensing whether a voltage drop is present in the voltage drop across the device.

When the 5V_RST signal provided from the power supply unit 20 is dropped from the 5V voltage by a predetermined value or the like and the power from the power supply unit 20 to the microcontroller 30 is supplied to the predetermined limit voltage The voltage drop detection method of the electronic control apparatus 100 according to the present invention determines whether a predetermined reset boundary time T1 has elapsed in a voltage drop state at step S40.

Here, it is preferable that the voltage drop detection method of the electronic control unit 100 according to the present invention stores minimum information (e.g., debug information record) required for restarting the system at a later time before performing step S40 (S20). This is because the data read from the memory 40 can not be relied upon from the time when the voltage drop of the normal voltage state power supplied from the power supply device 20 is sensed, This is because it must be done in RAM. Therefore, the minimum required software must be stored in the RAM of the microcontroller 30 in advance so that the microprocessor 30 can perform the subsequent operation immediately after the voltage drop is detected in step S10.

It is preferable that the voltage drop detection method of the electronic control apparatus 100 according to the present invention enters a predetermined low power mode before performing step S40 after step S20. This is because the electronic control apparatus 100 can use only a limited amount of electric power that the electronic control apparatus 100 can utilize from the time when a voltage drop to a power supply of a normal voltage state provided from the power supply apparatus 20 is sensed This is because it is necessary to complete the subsequent operation while consuming a minimum amount of power. Accordingly, immediately after the voltage drop is detected, the microcontroller 30 enters predetermined predetermined low power mode (e.g., sleep mode, operation frequency lowering, etc.) to minimize the operating power.

As described above, in the voltage drop sensing method of the electronic control unit 100 according to the present invention, when the power of the steady-state voltage supplied from the power supply unit 20 to the microcontroller 30 is lower than a predetermined threshold voltage level It is determined whether or not a predetermined reset boundary time T1 has elapsed in a descending state. That is, the microcontroller 30 starts counting the reset boundary time T1 from the voltage drop point.

Here, the method of detecting the voltage drop of the electronic control unit 100 according to the present invention determines whether or not the power supply voltage to the microcontroller 30 whose voltage has been lowered before the reset boundary time T1 elapses is returned to the normal voltage state (S50). The fact that the voltage of the voltage-dropped power supply returns to the normal voltage state before the reset boundary time T1 has elapsed is due to a temporary noise return or a temporary power supply situation that has affected the power supply 20 This means that instability has been resolved. Here, sensing whether or not to return to the normal voltage state will correspond to a method of detecting the above-described voltage drop.

If the normal voltage state is detected as the voltage-dropped power supplied from the power supply unit 20 returns to the normal voltage state before the reset boundary time T1 elapses, the electronic control apparatus 100 ) Determines whether the power supplied from the power supply 20 to the microcontroller 30 is maintained in a normal voltage state during a predetermined debounce time T2 elapses (S60) . That is, the microcontroller 30 determines whether or not the debounce time T2 has elapsed after the power from the power supply device 20 is returned to the normal voltage state.

Accordingly, if the power supplied from the power supply device 20 to the microcontroller 30 is maintained at the steady voltage state during the elapse of the debounce time T2, the voltage drop of the electronic control device 100 according to the present invention The method resets the microcontroller 30 and restarts the system (S70). That is, if the power supplied from the power supply 20 to the microcontroller 30 remains at the normal voltage state during the elapse of the debounce time T2, the temporary power supply When the instability of the situation is solved, the microcontroller 30 resets the software and restarts the system stably.

If it is determined in step S60 that the power from the power supply unit 20 is not maintained in the normal voltage state and the voltage drops again before the debounce time T2 elapses, 100, the microcontroller 30 ignores the return to the normal voltage state due to temporary noise, so that the reset boundary time T1 counted in step S40 has elapsed And continue to judge whether or not.

When the predetermined reset boundary time T1 elapses in a voltage drop state, the voltage drop detection method of the electronic control unit 100 according to the present invention resets the microcontroller 30 and restarts the system (S70) . That is, it is determined that the elapse of the reset boundary time (T1) in the voltage drop state is the abnormal voltage drop due to the malfunction of the power supply device 20, and the microcontroller 30 resets the software and restarts the system do.

Hereinafter, a process of detecting a voltage drop and restarting the system according to the voltage drop detection method of the electronic control unit 100 according to the present invention in a case of a general power supply unstable will be described with reference to FIG.

First, generally, an unstable case of the power supply in the electronic control unit 100 can be roughly divided into the following three cases (Case).

C1. Temporary voltage drop due to operation of a large number of power consumption devices

C2. Persistent voltage drop due to normal system shutdown

C3. Power supply failure state due to malfunction of the power supply device 20

For example, the battery 10 serves to supply power to the start motor at the start of the engine. Since a large amount of current is supplied at the moment when the start motor is first driven, a large voltage drop occurs. In most cases, the width of the voltage drop is within a range in which the power supply 20 of the electronic control unit 100 does not have a problem in providing a stable power supply. However, due to poor charging of the battery 10 or influence of external conditions, If this is the case, it may exceed the range, which corresponds to C1.

C2 corresponds to a case where the entire system to which the electronic control apparatus 100 belongs is turned off due to normal system power shutdown and C3. This corresponds to a case where the power supply device 20 in the apparatus 100 malfunctions.

3 shows the processing flow according to the present invention in case of C1. A2. Shows the processing flow of C2., And A3. Shows the processing flow of C3.

First, when a large amount of power consumption device (for example, start motor) operates at time t1 and a voltage drop is detected from the power supply device 20 to the microcontroller 30, Lt; RTI ID = 0.0 > T1. ≪ / RTI > At time t2 when the transient voltage drop due to the driving of a large amount of power consumption device (e.g., start motor) is solved, the present invention recognizes that the voltage returns to the normal voltage state and counts the debounce time T2 from time t2 do. Since C1 is a transient voltage drop due to the operation of a large amount of power consumption device (e.g., start motor), a steady voltage condition will be maintained as in A1. The microcomputer 30 resets the software of the microcontroller 30 at the time t3 when it is judged to be maintained and restarts the system stably.

A2, when a voltage drop is detected in the power supplied from the power supply device 20 to the microcontroller 30 at the time t1 when the normal system power-off occurs, the present invention counts the reset boundary time T1 do. At time t2 when the voltage drop is eliminated due to the transient noise, the present invention recognizes that the voltage returns to the normal voltage state and counts the debounce time T2 from time t2. Since C2 is a permanent voltage drop due to the normal system power-off, the temporary noise will disappear before the debounce time (T2) elapses as in A2, and the voltage drop will be maintained after the re- The power of the system will be turned off and the power of the electronic control unit 20 will be turned off at time t4 when the system power-off operation is completed before the elapse of the time T1.

A3. When a voltage drop is detected in the power supplied from the power supply device 20 to the microcontroller 30 at the time t1 when the power supply disabled state occurs due to malfunction of the power supply device 20, The invention counts the reset boundary time (T1). At time t2 when the voltage drop is eliminated due to the transient noise, the present invention recognizes that the voltage returns to the normal voltage state and counts the debounce time T2 from time t2. Since C3 is a voltage drop due to a power failure due to a malfunction of the power supply device 20, the temporary noise disappears before the debounce time T2 elapses and the voltage drop after the re- And eventually the present invention will reset the software of the microcontroller 30 at time t5 to recognize that the reset boundary time T1 has elapsed and restart the system in a stable manner.

As described above, according to the voltage sensing method of the power control apparatus 100 according to the present invention, when a voltage drop is detected in the power supply from the power supply device 20, Or if the power from the power supply 20 remains at the normal voltage state during the debounce time T2 before the reset boundary time T1 elapses, the software is reset to reliably restart the system It is determined that the abnormal voltage is caused by a malfunction of the power supply 20 in the power supply control apparatus 100 or a voltage drop due to the temporary power supply condition that has affected the power supply 20 and then the system is restarted .

Therefore, according to the voltage sensing method of the power supply control apparatus 100 according to the present invention, it is possible to provide a processing method for the voltage drop in the electronic control unit, which immediately restarts the system without judging the various kinds of voltage drop occurring in the vehicle And determines that the voltage is a voltage drop due to an abnormal voltage drop due to a malfunction of the power supply device 20 in the power supply control device 100 or a temporary power supply condition that affects the power supply device 20 It is possible to effectively detect / judge an abnormal voltage drop occurring in the power supply of the vehicle electronic control apparatus 100 and to restart the system by restarting the system.

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, but, on the contrary, It will be understood by those of ordinary skill in the art that various changes and modifications can be made without departing from the scope of the present invention.

If a voltage drop is detected on the power supply from the power supply, the power supply from the power supply remains in a normal voltage state during the debounce time before the reset boundary time elapses from a voltage drop, or before the reset boundary time has elapsed The system is restarted stably to determine whether the voltage is a voltage drop due to an abnormal voltage drop due to a malfunction of the power supply in the power supply control device or a temporary power supply condition that has affected the power supply, The power supply control device of the present invention and the voltage detection method of the power supply control device of the present invention which can restart the power supply control device of the present invention can significantly improve the stability of the related electronic parts, It is not only a possibility that the vehicle is sold or operated, Because the extent that may be carried out an invention that has industrial applicability.

1 is a control block diagram of an electronic control apparatus according to an embodiment of the present invention.

2 is a control flowchart of a voltage drop detection method of an electronic control apparatus according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating an example of a process of detecting a voltage drop and restarting a system according to the present invention in an unstable case of a general power supply.

Description of the Related Art

10: Battery

20: Power supply

30: Microprocessor

40: Memory

100: Electronic control device

Claims (6)

In the electronic control device, A power supply device for rectifying and supplying power from the battery to a predetermined voltage level; And Wherein the power supply control unit is driven using a power supply of the voltage level provided from the power supply unit and determines whether a predetermined reset boundary time has elapsed when the power supplied from the power supply unit drops in voltage below a predetermined threshold voltage level, And a microcontroller for restarting the system when the voltage of the power-downed power source is maintained at a normal voltage state for more than a predetermined debounce time before the reset boundary time elapses. The method according to claim 1, The microcontroller includes: And restarts the system when the reset boundary time elapses in a state in which the power supplied from the power supply device is dropped to a predetermined limit voltage level or lower. A method of detecting a voltage drop of an electronic control device, The method comprising: driving by using a power supply of the voltage level provided from a power supply that rectifies power from a battery to a predetermined voltage level; Detecting a voltage drop in which the power provided by the power supply drops below a predetermined threshold voltage level; Determining whether a predetermined reset boundary time has elapsed when the voltage drop is detected; Detecting whether a voltage of the power source whose voltage has dropped before the reset boundary time elapses returns to a normal voltage state; Determining whether the power supplied from the power supply unit is maintained in the steady-state voltage for a predetermined debounce time period when the power source is detected as a normal voltage state; And And restarting the system when it is determined that the power supply is maintained in the steady voltage state during the elapse of the debounce time. The method of claim 3, Further comprising the step of restarting the system when the reset boundary time has elapsed as a result of determining whether or not the reset boundary time has elapsed as a result of a voltage drop of the power provided from the power supply device Method of detecting voltage drop. The method according to claim 3 or 4, As a result of determining whether the power source is maintained in a normal voltage state during the elapse of the debounce time, if the power source is not maintained in a normal voltage state before the debounce time elapses, Wherein the step of determining the voltage drop of the electronic control unit is continued. 6. The method of claim 5, Storing the minimum information required to restart the system when the voltage drop is sensed; And Further comprising the step of entering a predetermined low power mode.

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