KR20210103054A - Apparatus and method for updating software of motor driven power steering of vehicle - Google Patents

Abstract

The present invention relates to an apparatus for updating software of a motor-driven power steering system for a car, which comprises: a central communication unit for communicating with a server outside the car to obtain the newest version of software downloaded and communicating with a user terminal outside the car to inform information on software update or receive a permission for updating; a high-level electronic control unit (ECU) for communicating with the central communication unit to output a wake-up signal to a controller area network (CAN) communication unit of a motor-driven power steering (MDPS) controller; the CAN communication unit of the MDPS controller woken up by the wake-up signal to output a first switch control signal for turning on a main power switch; and a control unit receiving driving power applied by the main power switch which is turned on by the first switch control signal to be activated, wherein the control unit performs CAN communication with the central communication unit through the CAN communication unit and receives new software downloaded from the central communication unit to perform updating. In accordance with the present invention, the software of the motor-driven steering system for a car can be updated remotely through confirmation of a driver while the car shuts off.

Description

Apparatus and method for software update of electric power steering system for vehicle

The present invention relates to an apparatus and method for updating a software of an electric steering apparatus for a vehicle, and to remotely update software of an electric steering apparatus for a vehicle by receiving confirmation from a driver even when the vehicle is turned off. It relates to a software update apparatus and method.

In general, a hydraulic power steering apparatus using the hydraulic pressure of a hydraulic pump is used as a power-assisted steering system for a vehicle, but since the 1990s, an electric steering system using an electric motor (MDPS: Motor Driven Power Steering) has become more common. is becoming

In the conventional hydraulic steering system, the hydraulic pump, which is the power source that assists the power, is driven by the engine and always consumes energy regardless of whether the steering wheel rotates. An energy-driven motor will provide steering assistance power. Therefore, when the electric steering system is used, there is an advantage in that the energy efficiency of the vehicle can be improved compared to the hydraulic steering system.

Meanwhile, as the spread of electric vehicles increases, the software update method of the OTA (Over The Air) method is used to update the software (SW) of the electronic control unit (ECU) for various electronic parts of the vehicle. will be further increased.

Accordingly, even in the case of an electric steering system (eg MDPS or EPS), the vehicle-level central communication unit (not shown) wirelessly downloads the latest version of the software (SW) from the server, and uses the downloaded latest software (SW). The update is performed at a specified time (eg, during driving or when the key is turned off) through the in-vehicle wired communication channel (eg, CAN or CAN-FD, etc.).

For example, in the past, when the electronic control unit (ECU) for the vehicle's electronic components updates new software, the memory for storing the software in the MCU (Micro Control Unit) itself has a dual structure when the update is made while driving. As such, it downloads the old version software currently running in one memory and the new version software to be newly applied to the other memory, and uses the memory area where the new version software is stored through the memory exchange (SWAP) at a specified time to store the electronic components. perform the function

In order to update the software in this way, there is a problem in that an expensive new MCU supporting a memory exchange (SWAP) function must be used. And if the new version software is downloaded from the central communication unit at the end of driving, the main power is cut off when key OFF is performed and the software update may be stopped. In order to do this, there is a problem in that the driver must wait several minutes or more in the vehicle to prevent the main power of the vehicle from being cut off and check whether the software update is normally completed.

The background technology of the present invention is disclosed in Korean Patent Registration No. 10-0247334 (registered on December 10, 1999, electric power steering device).

According to one aspect of the present invention, the present invention was created to solve the above problems, and it is possible to update the software of the electric steering device for a vehicle by receiving the driver's confirmation remotely even when the vehicle is turned off. , An object of the present invention is to provide a software update apparatus and method for an electric steering system for a vehicle.

A software update device for an electric steering device for a vehicle according to an aspect of the present invention communicates with a server outside the vehicle to download the latest version of software, and communicates with a user terminal outside the vehicle to notify information related to software update or to update the software. a central communication unit for receiving permission; an upper ECU (Electronic Control Unit) that communicates with the central communication unit and outputs a wake-up signal to the CAN communication unit of the MDPS controller; a CAN communication unit of the MDPS controller that wakes up by the wake-up signal and outputs a first switch control signal for turning on the main power switch; and a control unit activated by receiving driving power applied through the main power switch turned on by the first switch control signal, wherein the control unit CAN communicates with the central communication unit through the CAN communication unit, It is characterized in that the software update is performed by downloading new software from the central communication unit.

In the present invention, the first switch control signal is applied to the main power switch through a latch-type logic circuit unit, and the latch-type logic circuit unit is a gate circuit operating as an OR logic, output from the control unit. The main power switch is turned on and off according to a result of OR combination of the second switch control signal and the first switch control signal.

In the present invention, the latch type logic circuit unit turns on the main power switch when at least one of the first and second switch control signals is an ON signal, and controls the first and second switches When all of the signals are OFF signals, the main power switch is turned off.

In the present invention, the driving power applied to the control unit is, as the main power switch is turned on, battery power output from the power unit is applied to the regulator unit, and the regulator unit is the driving power applied to the control unit. do it with

In the present invention, when the controller is activated, the controller applies a second switch control signal to the main power switch through a latch-type logic circuit part.

In the present invention, the control unit is characterized in that it includes an electronic control unit (ECU) or a main controller (MCU) of the MDPS controller.

In the present invention, the control unit downloads the new software, stores it in the internal memory, performs an error check of the software, and then performs the update, but the download of the new software and the error check are repeated until the update is successfully completed. It is characterized in that it is performed.

In the present invention, when the update of the new software is successfully completed, the control unit notifies the completion of the update to the central communication unit, and is characterized in that it is implemented to notify the completion of the update to the user terminal through the central communication unit.

In the present invention, the control unit controls the CAN communication unit to the sleep mode state after notifying the completion of the update of the new software, and as the CAN communication unit enters the sleep mode state, the internal CAN communication unit switch is turned off, It is characterized in that the first switch control signal is converted into an OFF signal to be output.

In the present invention, after notifying the completion of the update of the new software, the control unit converts the second switch control signal into an OFF signal and outputs the first and second input to the latch type logic circuit unit accordingly. It is characterized in that the switch control signals are all OFF signals, so that the main power switch is turned off, and as the main power switch is turned off, the driving power supplied to the control unit through the regulator unit is cut off.

According to another aspect of the present invention, in a software update method of an electric steering device for a vehicle, when the central communication unit communicates with a server outside the vehicle to download the latest version of the software, communicates with a user terminal outside the vehicle to notify information related to the software update, receiving permission for a software update; outputting the wake-up signal to the CAN communication unit of the MDPS controller by communicating with the upper ECU in charge of the wake-up signal by the central communication unit; outputting a first switch control signal for turning on a main power switch when the CAN communication unit of the MDPS controller is woken up by the wake-up signal; a step in which a control unit is activated by receiving driving power applied through the main power switch turned on by the first switch control signal; and performing, by the control unit, CAN communication with the central communication unit through the CAN communication unit to download new software from the central communication unit and update the software.

In the present invention, the first switch control signal is applied to the main power switch through a latch type logic circuit unit, and the latch type logic circuit unit is a gate circuit operating as an OR logic, and is output from the control unit. It characterized in that the main power switch is turned on and off according to a result of combining the second switch control signal and the first switch control signal.

In the present invention, the latch type logic circuit unit turns on the main power switch when at least one of the first and second switch control signals is an ON signal, and controls the first and second switches When all of the signals are OFF signals, the main power switch is turned off.

In the present invention, in the step in which the control unit is activated by receiving the driving power applied through the main power switch, the driving power applied to the control unit is the battery output from the power supply unit as the main power switch is turned on. Power is applied to the regulator unit, and the regulator unit is characterized in that the driving power applied to the control unit.

In the present invention, when the controller is activated, the controller applies a second switch control signal to the main power switch through a latch-type logic circuit part.

In the present invention, in the step of downloading the new software from the central communication unit and performing the software update, the control unit downloads the new software and stores it in the internal memory and then performs the update after performing an error check of the software, It is characterized in that the download of new software and error checking are repeatedly performed until the update is successfully completed.

In the present invention, in the step of performing the software update by downloading the new software from the central communication unit, when the update of the new software is successfully completed, the control unit notifying the completion of the update to the central communication unit; further comprising And, it is characterized in that it is implemented to notify the completion of the update to the user terminal through the central communication unit.

In the present invention, after the step of notifying the completion of the update of the new software, the control unit controls the CAN communication unit to the sleep mode state; further comprising, as the CAN communication unit enters the sleep mode state, the internal As the CAN communication unit switch is turned off, the first switch control signal is converted into an OFF signal and output.

In the present invention, after the step of notifying the completion of the update of the new software, the step of, by the control unit, converting the second switch control signal into an OFF signal and outputting it; Both the first and second switch control signals input to the . It is characterized in that it is implemented so as to be possible.

According to an aspect of the present invention, the software of the electric steering apparatus for a vehicle can be updated by receiving the driver's confirmation remotely even when the vehicle is turned off.

1 is an exemplary diagram showing a schematic configuration of a software update device of an electric steering system for a vehicle according to an embodiment of the present invention;
2 is a flowchart illustrating a software update method of an electric steering system for a vehicle according to an embodiment of the present invention.

Hereinafter, an embodiment of a software update apparatus and method for an electric steering apparatus for a vehicle according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is an exemplary diagram illustrating a schematic configuration of an apparatus for updating software of an electric steering apparatus for a vehicle according to an embodiment of the present invention.

As shown in FIG. 1 , it includes a power supply unit 210 , a central communication unit 220 , an upper ECU 230 , and an MDPS controller 240 (ie, a vehicle electric steering system).

Here, the MDPS controller 240 as a subject of software update includes a main power switch 241 , a regulator unit 242 , a latch type logic circuit unit 243 , a control unit 244 , and a CAN communication unit 245 . And the CAN communication unit 245 includes a wake-up detection unit 246 and the CAN communication unit switch 247 internally.

In addition, the central communication unit 220 externally performs communication with the upper server 300 (ie, a server that provides software of the electric vehicle steering system) in a wireless manner to download the latest version of the software. In addition, the central communication unit 220 externally communicates with the user's terminal (eg, portable terminal) 100 in a wireless manner to notify information related to software update or receive permission through the user's terminal 100 . do.

The power supply unit 210 includes a battery power source as the main power source of the vehicle.

The upper ECU 230 is an upper electronic control unit (ECU) of the CAN communication unit 245 of the MDPS controller 240 and is an electronic control unit (ECU) that manages a wake-up signal inside the vehicle. The upper ECU 230 outputs a wake-up signal to the CAN communication unit 245 of the MDPS controller 240 according to the communication of the central communication unit 220 .

The CAN communication unit 245 of the MDPS controller 240 wakes up from the sleep state and becomes an active state when a wake-up signal is received through the wake-up detection unit 246 . When the CAN communication unit 245 of the MDPS controller 240 wakes up and the wake-up detection unit 246 receives a wake-up signal, the CAN communication unit switch 247 is turned on to transmit a first switch control signal. output to the latch type logic circuit unit 243 .

Here, the latch-type logic circuit unit 243 is a gate circuit operating as an OR logic, and is a result of ORing the second switch control signal output from the control unit 244 and the first switch control signal. Accordingly, the main power switch 241 is turned on and off.

For example, the latch type logic circuit unit 243 turns on the main power switch 241 when at least one of the first and second switch control signals is an ON signal, and the first and second switch control signals are turned on. When all of the switch control signals are OFF signals, the main power switch 241 is turned off. Accordingly, as the CAN communication unit 245 of the MDPS controller 240 wakes up, the CAN communication unit switch 247 is turned on and the latch type logic circuit unit 243 is output by the first switch control signal (ON signal) output. through the main power switch 241 is turned on.

As the main power switch 241 is turned on, battery power output from the power supply unit 210 is applied to the regulator unit 242, and the regulator unit 242 supplies driving power to the control unit 244. By applying, the control unit 244 is activated. When the control unit 244 is activated, a second switch control signal (ON signal) is applied to the latch type logic circuit unit 243 .

Here, the control unit 244 is a concept including an electronic control unit (ECU) or a main controller (MCU) of the MDPS controller.

In addition, as the control unit 244 is activated, the control unit 244 performs CAN communication with the central communication unit 220 through the CAN communication unit 245 to confirm that the new software (ie, the latest version software) has been downloaded, and the New software downloaded from the central communication unit 220 is downloaded through CAN communication and stored in the internal memory (not shown) of the control unit 244 .

In addition, the control unit 244 performs an error check (eg, checksum check) of the software downloaded and stored in the internal memory (not shown), and then performs the update. In this case, the download of the new software and the error check may be repeatedly performed until the update is successfully completed, and the user's terminal 100 may be notified of the situation according to a preset option.

On the other hand, when the update of the new software is successfully completed, the control unit 244 notifies (replys) the completion of the update to the central communication unit 220, and completes the update to the user's terminal 100 through the central communication unit 220 to be able to inform

In addition, after notifying (replying) the completion of the update of the new software, the control unit 244 controls the CAN communication unit 245 to a sleep mode state, and as the CAN communication unit 245 switches to the sleep mode state, the internal As the CAN communication unit switch 247 is turned off, the first switch control signal is converted into an OFF signal.

In addition, the control unit 244 converts the second switch control signal into an OFF signal and outputs, so that both the first and second switch control signals input to the latch type logic circuit unit 243 are OFF. As a signal, the main power switch 241 is turned off.

Accordingly, as the main power switch 241 is turned off, the driving power supplied to the control unit 244 through the regulator unit 242 is also cut off. mode will be entered.

As described above, the present embodiment has an effect of enabling the software update of the electric power steering apparatus for a vehicle even when the engine is turned off without the user getting in the vehicle.

2 is a flowchart illustrating a software update method of an electric steering apparatus for a vehicle according to an embodiment of the present invention.

Referring to FIG. 2 , when the central communication unit 220 of the vehicle downloads the new software (SW) from the server 300 (S101), the current vehicle state is the ignition-off state and the driver (ie, the user) is in the vehicle departure state. It is checked whether it is (S102).

As a result of the check (S102), if the current vehicle state is not the ignition-off state and the driver (ie, the user) is not in the vehicle departure state (NO in S102), the central eye communication unit 220 is an in-vehicle AVN (Audio Video Navigation) device (not shown) performs a notification about the software update schedule.

As a result of the check (S102), if the driver (ie, the user) starts the vehicle off and leaves the vehicle (Yes in S102), the voltage state of the battery is checked (S104), and when the voltage of the battery is lower than the preset voltage ( Example of S104) At the next start-off, the software update is attempted again (S105).

As a result of checking the voltage state of the battery (S104), if the voltage of the battery is not lower than the preset voltage (NO in S104), the central communication unit 220 informs the user's designated terminal 100 of software update information and The user's permission is requested (S106). At this time, according to a predetermined option, only software update information is notified and the user's permission is not requested, and the software update may be performed immediately.

On the other hand, when the driver (ie, the user) does not permit (approve) the software update (No in S107), the central communication unit 220 retries the software update when the engine is turned off next (S108). However, when the driver (ie, the user) permits (approve) the software update (or performs the software update without approval) (Yes in S107 ), the central communication unit 220 MDPS through the designated upper ECU 230 . A wake-up signal is output to the controller 240 (S109).

Here, the upper ECU 230 is an upper electronic control unit (ECU) of the CAN communication unit 245 of the MDPS controller 240, and is an electronic control unit (ECU) that manages a wake-up signal inside the vehicle.

Accordingly, the CAN communication unit 245 of the MDPS controller 240 wakes up from the sleep state and enters an active state when a wake-up signal is received through the wake-up detection unit 246 (S110). And when the wake-up detection unit 246 receives the wake-up signal, the main power switch by turning on the CAN communication unit switch 247 in the CAN communication unit 245 to output a first switch control signal (ON signal) (241) is turned on to apply power to the regulator unit 242 (S112).

At this time, the first switch control signal (ON signal) controls the on/off of the main power switch 241 through the latch type logic circuit unit 243, and the latch type logic circuit unit 243 includes the first and When at least one of the second switch control signals is an ON signal, the main power switch 241 is turned on, and when both the first and second switch control signals are OFF signals, the main power switch 241 is an OFF signal. Turn off the power switch 241.

The regulator unit 242 supplies driving power to the control unit 244 (S113).

When the control unit 244 supplied with the driving power is activated, CAN communication with the central communication unit 220 through the CAN communication unit 245 to confirm that the new software (ie, the latest version software) has been downloaded (S114), The new software downloaded from the central communication unit 220 is downloaded in the CAN communication method through the CAN communication unit 245 and stored in the internal memory (not shown) of the control unit 244 (S115).

In addition, the control unit 244 performs an error check (eg, checksum check) of the software stored in the internal memory (not shown) and then performs the update (S116).

At this time, the download of the new software and the error check may be repeatedly performed until the update is successfully completed (S115 to S117), and according to a preset option, it is transmitted to the user's terminal 100 through the central communication unit 220 according to a preset option. The situation may be notified (S118).

Meanwhile, when the update of the new software is successfully completed (YES in S117), the control unit 244 notifies (replys) the completion of the update to the central communication unit 220 (S119).

Accordingly, the central communication unit 220 notifies the completion of the update to the user's terminal 100 (S120).

In addition, after notifying (replying) the completion of the update of the new software, the control unit 244 controls the CAN communication unit 245 to a sleep mode state, and as the CAN communication unit 245 switches to the sleep mode state, the internal When the CAN communication unit switch 247 is turned off, the first switch control signal is converted into an OFF signal and output, so that both the first and second switch control signals input to the latch type logic circuit unit 243 are As an OFF signal, the main power switch 241 is turned off, and as the main power switch 241 is turned off, the driving power supplied to the control unit 244 through the regulator unit 242 is Also blocked, the control unit 244 is also deactivated, and the MDPS controller 240 enters a low power mode (S121).

As described above, the present embodiment has the effect of enabling the software update of the electric steering apparatus for a vehicle even in a state in which the user turns off the engine without getting in the vehicle.

As described above, the present invention has been described with reference to the embodiment shown in the drawings, but this is merely exemplary, and various modifications and equivalent other embodiments are possible therefrom by those of ordinary skill in the art. will understand the point. Therefore, the technical protection scope of the present invention should be defined by the following claims. Also, the implementations described herein may be implemented as, for example, a method or process, an apparatus, a software program, a data stream, or a signal. Although discussed only in the context of a single form of implementation (eg, only as a method), implementations of the discussed features may also be implemented in other forms (eg, in an apparatus or a program). The apparatus may be implemented in suitable hardware, software and firmware, and the like. A method may be implemented in an apparatus such as, for example, a processor, which generally refers to a computer, a microprocessor, a processing device, including an integrated circuit or programmable logic device, or the like. Processors also include communication devices such as computers, cell phones, portable/personal digital assistants ("PDAs") and other devices that facilitate communication of information between end-users.

100: mobile terminal 200: car
210: power supply 220: central communication unit
230: upper ECU 240: MDPS controller
241: main power switch 242: regulator unit
243: latch type logic circuit unit 244: control unit
245: CAN communication unit 246: wake-up detection unit
247: CAN communication unit switch 300: server

Claims (19)

a central communication unit that communicates with a server outside the vehicle to download the latest version of the software, and communicates with a user terminal outside the vehicle to notify information related to software update or receive an update permission;
an upper ECU (Electronic Control Unit) that communicates with the central communication unit and outputs a wake-up signal to the CAN communication unit of the MDPS controller;
a CAN communication unit of the MDPS controller that wakes up by the wake-up signal and outputs a first switch control signal for turning on the main power switch; and
a control unit activated by receiving driving power applied through the main power switch turned on by the first switch control signal;
The control unit CAN communication with the central communication unit through the CAN communication unit software update device for a vehicle electric steering device, characterized in that the download new software from the central communication unit to perform a software update.
The method of claim 1,
The first switch control signal is applied to the main power switch through a latch type logic circuit unit,
The latch type logic circuit unit,
A gate circuit operating with OR logic, characterized in that the main power switch is turned on and off according to a result of OR combination of the second switch control signal output from the control unit and the first switch control signal A software update device for electric power steering systems for vehicles.
3. The method of claim 2, wherein the latch type logic circuit unit comprises:
Turning on the main power switch when at least one of the first and second switch control signals is an ON signal,
The software update apparatus of claim 1, wherein the main power switch is turned off when both the first and second switch control signals are OFF signals.
According to claim 1, wherein the driving power applied to the control unit,
When the main power switch is turned on, battery power output from the power supply is applied to the regulator, and the regulator is the driving power applied to the control unit.
The method of claim 1, wherein when the control unit is activated,
The control unit is
A software update device for an electric steering apparatus for a vehicle, characterized in that applying a second switch control signal to the main power switch through a latch type logic circuit unit.
According to claim 1, wherein the control unit,
An electronic control unit (ECU) or a main controller (MCU) of the MDPS controller.
According to claim 1, wherein the control unit,
After downloading the new software and storing it in the internal memory, perform the software error check before performing the update.
The software update device for an electric steering system for a vehicle, characterized in that the download of the new software and the error check are repeatedly performed until the update is successfully completed.
According to claim 1, wherein the control unit,
When the update of the new software is successfully completed, the central communication unit notifies the completion of the update;
The software update device of the electric steering device for a vehicle, characterized in that implemented to notify the completion of the update to the user terminal through the central communication unit.
The method of claim 8, wherein the control unit,
After notifying the completion of the update of the new software, the CAN communication unit is controlled in the sleep mode state, and as the CAN communication unit is switched to the sleep mode state, the internal CAN communication unit switch is turned off, so that the first switch control signal is turned off (OFF) ) A software update device for an electric steering system for a vehicle, characterized in that it is converted into a signal and output.
10. The method of claim 9, wherein the control unit,
After notifying the completion of the update of the new software, the second switch control signal is converted to an OFF signal and output,
Accordingly, both the first and second switch control signals input to the latch type logic circuit unit become OFF signals, thereby turning off the main power switch,
The software update device of the electric steering apparatus for a vehicle, characterized in that the driving power supplied to the control unit through the regulator is cut off as the main power switch is turned off.
when the central communication unit communicates with a server outside the vehicle to download the latest version of the software, communicating with a user terminal outside the vehicle to notify information related to the software update and to receive permission for the software update;
outputting the wake-up signal to the CAN communication unit of the MDPS controller by communicating with the upper ECU in charge of the wake-up signal by the central communication unit;
outputting a first switch control signal for turning on a main power switch when the CAN communication unit of the MDPS controller is woken up by the wake-up signal;
a step in which a control unit is activated by receiving driving power applied through the main power switch turned on by the first switch control signal; and
and performing, by the control unit, CAN communication with the central communication unit through the CAN communication unit to download new software from the central communication unit and perform a software update.
The method of claim 11, wherein the first switch control signal,
is applied to the main power switch through a latch type logic circuit unit,
The latch type logic circuit unit,
A gate circuit operating with OR logic, characterized in that the main power switch is turned on and off according to a result of OR combination of the second switch control signal output from the control unit and the first switch control signal How to update the software of an electric steering system for a vehicle.
13. The method of claim 12, wherein the latch type logic circuit unit comprises:
Turning on the main power switch when at least one of the first and second switch control signals is an ON signal,
The software update method of the electric steering system for a vehicle, characterized in that the main power switch is turned off when both the first and second switch control signals are OFF signals.
The method according to claim 11, wherein in the step of being activated by receiving the driving power applied through the main power switch, the control unit is activated,
The driving power applied to the control unit is
As the main power switch is turned on, battery power output from the power supply is applied to the regulator,
The software update method of the electric steering apparatus for a vehicle, characterized in that the regulator unit is the driving power applied to the control unit.
The method of claim 11, wherein when the control unit is activated,
The control unit is
A software update method for an electric power steering apparatus for a vehicle, characterized in that applying a second switch control signal to the main power switch through a latch type logic circuit unit.
12. The method of claim 11, wherein in the step of downloading new software from the central communication unit and performing a software update,
The control unit is
After downloading the new software and storing it in the internal memory, perform the software error check before performing the update.
The software update method of the electric steering system for a vehicle, characterized in that the downloading of the new software and the error check are repeatedly performed until the update is successfully completed.
12. The method of claim 11, wherein in the step of downloading new software from the central communication unit and performing a software update,
When the new software update is successfully completed,
the control unit,
Further comprising; notifying the completion of the update to the central communication unit;
The software update method of the electric steering device for a vehicle, characterized in that implemented to notify the completion of the update to the user terminal through the central communication unit.
18. The method of claim 17,
After the step of notifying the completion of the update of the new software,
Further comprising; controlling, by the control unit, the CAN communication unit to a sleep mode state;
As the CAN communication unit is switched to the sleep mode state, the internal CAN communication unit switch is turned off, so that the first switch control signal is converted to an OFF signal and output. Way.
19. The method of claim 18,
After the step of notifying the completion of the update of the new software,
The control unit, further comprising; switching the second switch control signal to the off (OFF) signal output;
Accordingly, both the first and second switch control signals input to the latch-type logic circuit unit become OFF signals, thereby turning off the main power switch, and as the main power switch is turned off, the control unit is supplied to the control unit through the regulator unit. A software update method for an electric steering system for a vehicle, characterized in that implemented so that the supplied driving power is cut off.

Images