TW202403681A - Recording system and method of power back door's event log - Google Patents

Abstract

Recording system and method of power back door’s event log is provided therefore. The recording system comprises a power back door, a storage unit, and an electronic control unit. The electronic control unit connects to a control unit of the power back door and the storage unit. The storage unit store an initial time information, an external time information, and an event log file. The electronic control unit generates a count information by time interval. The electronic control unit record the count information as a first information when the control unit receives a control order. The electronic control unit record the count information as a second information when the electronic control unit receives a trigger order. The electronic control unit generates a first estimate information according to a first count information or a last count information. The electronic control unit generates a second estimate information according to the first count information or the last count information.

Description

Processing system and method for recording event time of electric tailgate

It relates to a recording device and method for an electronic system, and in particular to a processing system and method for recording the event time of an electric tailgate.

For Hyundai Motor, it not only provides transportation, but also adds "convenience", "safety" and "energy saving". Therefore, modern cars require a large number of automotive electronic components to achieve the purpose of making the vehicle smart. For example, the user can use foot detection to trigger the opening of the power back door while holding the goods with both hands, so that the vehicle can automatically open the rear compartment door. Due to the convenience brought by electric tailgates, many car owners will also install electric tailgates.

If the electric tailgate fails, the manufacturer needs to read the event record file (Log file) of the electric tailgate to clarify the operation error of the electric tailgate. Currently, most of the electronic control components on the market control the electric tailgate and its various sensing components. There is no real-time clock (RTC) built into the electronic control components.

In view of this, in some embodiments a processing system is provided that records the event time of the electric tailgate. The processing system that records the event time of the electric tailgate includes the electric tailgate, a storage unit and an electronic control unit. The electric tailgate includes a controlled component, which responds to the trigger signal according to the control command; the storage unit stores initial time information and event record files; the electronic control unit is electrically connected to the controlled component and the storage unit, and the electronic control unit counts intervals. information, the electronic control unit receives the trigger signal responded by the controlled element, the electronic control unit records the interval count information when sending the control command as the first interval information, and the electronic control unit records the interval count information when receiving the trigger signal as the second interval information; The electronic control unit associates the initial time information with the first-end interval information of the event record file. The electronic control unit calculates the first estimated time corresponding to the first interval information based on the initial time information and the first-end interval information, or the electronic control unit calculates the first estimated time corresponding to the first interval information based on the initial time. The information and the first-end interval information are used to calculate the second estimated time corresponding to the second interval information. The processing system that records the event time of the electric tailgate uses the electronic control unit to record the interval count information of the controlled components in a time-sharing manner. The electronic control unit calculates the actual time point of the event corresponding to the controlled element through the interval count information. The electronic control unit can obtain the actual time point of each event of the controlled element without using the real-time clock.

In some embodiments, the storage unit stores interval error information, and the electronic control unit adjusts the first estimated time or the second estimated time according to the interval error information.

In some embodiments, a processing system for recording event time of an electric tailgate includes an electric tailgate, a storage unit and an electronic control unit. The electric tailgate includes a controlled component, which responds to a trigger signal according to a control command; a storage unit stores event record files; an electronic control unit is electrically connected to the controlled component and the storage unit, and the electronic control unit counts intervals and counts information, electronic control The unit receives the trigger signal responded by the controlled element. The electronic control unit records the interval count information when sending the control command as the first interval information. The electronic control unit records the interval count information when receiving the trigger signal as the second interval information. The electronic control unit records according to the The sequence records each first interval information and each second interval information to the event record file; the electronic control unit receives the time synchronization request, the time synchronization request includes external time information, and the electronic control unit obtains the end from the event record file according to the time synchronization request. Interval information, the electronic control unit calculates the first estimated time corresponding to each first interval information based on the external time information and the terminal interval information, or the electronic control unit calculates the corresponding first estimated time of each second interval information based on the external time information and the terminal interval information. Second estimated time.

In some embodiments, the terminal interval information is the first interval information of the last piece or the second interval information of the last piece in the event record file.

In some embodiments, the storage unit stores interval error information, and the electronic control unit adjusts the first estimated time or the second estimated time according to the interval error information.

In some embodiments, a processing method for recording the event time of an electric tailgate includes the following steps: recording the initial time information of the electric tailgate; counting the interval count information by an electronic control unit, and recording each interval count information to an event record In the file; the electronic control unit records the interval count information for sending the control command as the first interval information; when the electronic control unit receives the trigger signal in response to the electric tailgate, the electronic control unit records the interval count information when it receives the trigger signal as the second interval information. Interval information; the electronic control unit loads the initial time information and corresponds to the first-end interval information of the event record file; the electronic control unit calculates the first estimated time corresponding to the first interval information based on the initial time information and the first-end interval information; electronic control The unit calculates the second estimated time corresponding to the second interval information based on the initial time information and the first-end interval information.

In some embodiments, the step of the electronic control unit calculating the first estimated time and the second estimated time corresponding to the first interval information based on the initial time information includes the electronic control unit adjusting the first estimated time based on the interval error information; The control unit adjusts the second estimated time according to the interval error information.

In some embodiments, the step of the electronic control unit calculating the first estimated time and the second estimated time based on the initial time information includes the electronic control unit recording the corresponding first estimated time into the event record file based on the first interval information. ; The electronic control unit records the corresponding second estimated time into the event record file based on the second interval information.

In some embodiments, a processing method for recording event time of an electric tailgate includes the following steps: counting interval count information by an electronic control unit, and recording each interval count information into an event record file; recording and sending by the electronic control unit The interval count information of the control command is the first interval information; when the electronic control unit receives the trigger signal in response to the electric tailgate, the electronic control unit records the interval count information when receiving the trigger signal as the second interval information; the electronic control unit converts the third interval information to The first interval information and the second interval information are sequentially recorded to the event record file; the electronic control unit obtains the end interval information and external time information of the event record file; the electronic control unit calculates the first interval information corresponding to the external time information and the end interval information. The first estimated time; the electronic control unit calculates the second estimated time corresponding to the second interval information based on the external time information and the terminal interval information.

In some embodiments, the step of the electronic control unit calculating the first estimated time and the second estimated time corresponding to the first interval information based on the initial time information includes the electronic control unit adjusting based on an interval error information. The first estimated time; the electronic control unit adjusts the second estimated time according to an interval error information.

The processing system and method for recording the event time of an electric tailgate are used to record the event occurrence time when the electric tailgate is operated. The electronic control components of the processing system can record the interval count information of each controlled component during operation through the built-in crystal oscillator and interval counter. The electronic control component further calculates the first estimated time or the second estimated time of each event based on the interval counting information and the event record file.

Please refer to FIG. 1 , which is a schematic diagram of the architecture of a processing system for recording event time of an electric tailgate according to an embodiment. The electric tailgate 110 can be applied to gasoline vehicles, gasoline-electric vehicles, or electric vehicles. The aforementioned various types of vehicles are collectively referred to as automatic vehicles. The processing system that records the event time of the electric tailgate 110 (hereinafter referred to as the processing system 100) may be integrated into the driving control computer of the automatic vehicle, or may be independent of the driving control computer. The processing system 100 includes an electric tailgate 110, a storage unit 120, and an electronic control unit 130 (Electronic Control Unit, ECU). The electronic control unit 130 is connected to the storage unit 120 and the electric tailgate 110 .

The electric tailgate 110 includes at least one controlled element 111 . The controlled element 111 is connected to the electronic control unit 130 . The controlled element 111 may receive a control command 141 from the outside or a control command 141 sent by the electronic control unit 130 . The controlled component 111 responds to the trigger signal 142 according to the control command 141. The controlled element 111 may be, but is not limited to, a current sensing element, a voltage sensing element, a pulse-width modulation (PWM), a gear position detection element, a temperature detection element, or a tailgate latch. ), tailgate position sensing element, tailgate kick sensing element, tailgate stay position sensing element, tailgate stay current sensing element, display light or a combination of the aforementioned components. For example, the external control command 141 may be an external control command 141 received by a tailgate kick sensing element, a current sensing element, a voltage sensing element, a gear position detection element or a temperature detection element. Alternatively, the electronic control unit 130 drives the control command 141 that displays the light signal.

The storage unit 120 stores initial time information 121 and event record files 122. The storage unit 120 may be flash memory, Erasable Programmable Read-Only Memory, or Electrically Erasable Programmable Read-Only Memory. Memory). The initial time information 121 is the installation time of the electric tailgate 110 in the automatic vehicle. Generally speaking, after the car factory installs the electric tailgate 110, the processing system 100 will be enabled and the processing system will be connected to the car factory's computer. The vehicle manufacturer's computer transmits the initial time information 121 to the processing system 100 through the communication pin 131 . The event record file 122 records each interval count information, the interval count information of the controlled element 111 receiving the control command 141 and responding to the trigger signal 142 (the generation process of the interval count information will be described later). The first piece of interval count information in the event record file 122 is referred to as the first interval information 411 below. The last interval count information when the electronic control unit 130 reads the event record file 122 is called the end interval information 412.

The electronic control unit 130 includes a communication pin 131, a crystal oscillator 132 (quartz crystal unit) and a processing unit 133. The processing unit 133 is connected to the communication pin 131 and the crystal oscillator 132 . The communication pin 131 is connected to the controlled component 111 . The processing unit 133 counts in equal time intervals according to the clock cycle of the crystal oscillator 132, and the number of times counted is interval counting information. Because the clock of the crystal oscillator 132 is a fixed value. Therefore, each clock cycle of the crystal oscillator 132 can be regarded as equal time length (Tick). The processing unit 133 sends the control command 141 to the controlled component 111 through the communication pin 131 . When the processing unit 133 sends the control command 141, the processing unit 133 records the interval count information of the sending control command 141 as the first interval information 123. Alternatively, when the controlled element 111 receives an external control command 141, the electronic control unit 130 can obtain the interval count information of the received control command 141 based on the response of the controlled element 111. When the controlled element 111 responds to the trigger signal 142 to the electronic control unit 130, the electronic control unit 130 records the interval count information received from the trigger signal 142 as the second interval information 124.

For further explanation, please refer to FIG. 2 , which is a schematic flow chart of recording the event time of the electric tailgate according to an embodiment. Step S210: Record the initial time information of the electric tailgate; Step S220: The electronic control unit counts interval counting information, and records each interval counting information into the event record file; Step S230: The electronic control unit records the interval count information for sending the control command as the first interval information; Step S240: When the electronic control unit receives the trigger signal in response to the electric tailgate, the electronic control unit records the interval count information when the trigger signal is received as the second interval information; Step S250: The electronic control unit loads the initial time information and corresponds to the first-end interval information of the event record file; Step S260: The electronic control unit calculates the first estimated time corresponding to the first interval information based on the initial time information and the first-end interval information; and Step S270: The electronic control unit calculates the second estimated time corresponding to the second interval information based on the initial time information and the first-end interval information.

When the electric tailgate 110 is installed on the automatic vehicle, the electronic control unit 130 records the installation time of the electric tailgate 110 as the initial time information 121 . The electronic control component records the initial time information 121 into the event record file 122, and records the initial time information 121 as the head-end interval information 411. In other words, in addition to the first interval count information, the first interval information 411 also includes the actual time.

Then, the electronic control unit 130 counts the interval counting information at equal time intervals. The electronic control unit 130 may sequentially record the interval count information into the event record file 122 . During the interval counting process of the electronic control unit 130, the electronic control unit 130 will monitor the following conditions of the controlled element 111. Situation 1. The controlled component 111 receives the control command 141; Situation 2. The controlled component 111 sends a trigger signal 142. The controlled component 111 may receive a control command 141 from an electronic control component, or may be a control command 141 obtained through induction.

When the electronic control element monitors the occurrence of the above situation, the electronic control element will simultaneously record the current interval count information and the trigger signal 142 (or control command 141) of the controlled element 111 in the event record file 122. The electronic control element corresponds the current interval count information to the control command 141 received by the controlled element 111 , and calls the corresponding interval count information the first interval information 123 . The electronic control element corresponds the current interval count information to the trigger signal 142 received by the controlled element 111, and calls the corresponding interval count information second interval information 124.

Generally speaking, the electronic control component can select the closest interval count information to the trigger signal 142 (or control command 141) as the current interval count information, as shown in FIG. 3A. The square wave in FIG. 3A is the clock waveform of the crystal oscillator 132 . Each clock pulse is regarded as a timing interval of equal length and the number of the clock pulse is recorded sequentially as interval counting information. The electronic control element uses the rising edge of the control command 141 (or the trigger signal 142) as the recording time point of the interval counting information, as shown in FIG. 3A. In FIG. 3A , the control command 141 or the trigger signal 142 is represented by a thick black arrow, and the dotted line is the edge of the clock waveform corresponding to the first interval information 123 or the second interval information 124 . Alternatively, the electronic control element uses the falling edge of the control command 141 (or the trigger signal 142) as the interval counting information, as shown in FIG. 3B. The electronic control component records each interval count information into the event record file 122 in sequence, as shown in FIG. 4 . In Figure 4, the interval count information circled in the thick line frame is the first interval information 411, the interval count information circled in the thin line frame is the first interval information 123, and the interval count information circled in the dotted line frame is the second interval Information 124.

Subsequently, the electronic control component calculates the difference in interval counts between the first-end interval information 411 and the first interval information 123 . The electronic control component calculates the first estimated time of the first interval information 123 based on the difference between the interval counts (Δ1 in FIG. 4 ) and the clock. The electronic control component multiplies the difference value by the clock pulse to obtain the first estimated time.

In the same way, the electronic control component calculates the difference between the first-end interval information 411 and the second interval information 124, as shown in Δ2 in Figure 4. The electronic control element calculates the corresponding second estimated time based on the aforementioned difference. The electronic control component records the first estimated time to the corresponding first interval information 123 in the event record file 122 . The electronic control component records the second estimated time to the corresponding second interval information 124 in the event record file 122 . The processing system 100 calculates the estimated time when the event of the controlled component 111 of the electric tailgate 110 is triggered based on the initial time and interval count information. The electronic control unit 130 can realize timing of the operation schedule of the controlled element 111 through its own crystal oscillator 132 .

In some embodiments, the processing system 100 includes an electric tailgate 110 , a storage unit 120 and an electronic control unit 130 . For the connection structure of the electric tailgate 110, the storage unit 120 and the electronic control unit 130, please refer to FIG. 1 and its description.

The electronic control unit 130 can receive a time synchronization request through the communication pin 131 , and the time synchronization request includes external time information 143 . The external time information 143 is the actual time provided by the external device. The communication pin 131 may be, but is not limited to, Ethernet, Local Interconnect Network (LIN), Controller Area Network (CAN), FlexRay network, or media guidance system transmission. (Media Oriented Systems Transport, MOST). Therefore, the electronic control component receives the timing request from the external device through the communication pin 131 . The external device may be, but is not limited to, a vehicle control computer, a vehicle navigation device, a mobile phone or a mobile computer, etc. For example, the tester can time the timing through a mobile phone and transmit the timing results to the electronic control unit 130 through the wireless network. Alternatively, the tester sends a time adjustment request to the electronic control unit 130 through the vehicle control computer.

To further explain how the electronic control unit 130 calculates the first estimated time and the second estimated time, please refer to FIG. 5 , which is a schematic flow chart of recording the event time of the electric tailgate according to an embodiment. The processing method of recording the event time of the electric tailgate 110 includes the following steps: Step S510: The electronic control unit counts interval counting information, and records each interval counting information into the event record file; Step S520: The electronic control unit records the interval count information for sending the control command as first interval information; Step S530: When the electronic control unit receives the trigger signal in response to the electric tailgate, the electronic control unit records the interval count information when the trigger signal is received as the second interval information; Step S540: The electronic control unit records the first interval information and the second interval information sequentially into the event record file; Step S550: The electronic control unit obtains the end interval information and external time information of the event record file; Step S560: The electronic control unit calculates the first estimated time corresponding to the first interval information based on the external time information and the terminal interval information; and Step S570: The electronic control unit calculates the second estimated time corresponding to the second interval information based on the external time information and the terminal interval information.

First, the electronic control unit 130 records the interval count information by interval counting, and records the interval count information in the event recording file 122 . The electronic control element corresponds the current interval count information to the control command 141 received by the controlled element 111 , and calls the corresponding interval count information the first interval information 123 . The electronic control element corresponds the current interval count information to the trigger signal 142 received by the controlled element 111, and calls the corresponding interval count information second interval information 124.

When the electronic control unit 130 receives the time synchronization request, the electronic control unit 130 will suspend the recording process of the event recording file 122 and the interval count information. The last interval count information recorded by the electronic control unit 130 is here called end interval information 412, as shown in FIG. 6 . In Figure 6, the interval count information circled by the thick line frame is the end interval information 412, the interval count information circled by the thin line frame is the first interval information 123, and the interval count information circled by the dotted line frame is the second interval information. 124. The electronic control unit 130 maps the external time information 143 to the end interval information 412 . In other words, the corresponding time of the end interval information 412 is the external time information 143 .

The electronic control component estimates each first estimated time based on the terminal interval information 412 . The electronic control component takes the end interval information 412 as a starting point and calculates the difference between the first interval information 123 and the end interval information 412 . The electronic control component calculates the first estimated time of the first interval information 123 based on the calculated difference and the clock of the crystal oscillator 132 . The electronic control component performs corresponding calculations on each first interval information 123 according to the aforementioned method, and records the obtained first estimated time into the event record file 122 . In the same way, the electronic control component also estimates the second estimated time corresponding to each second interval information 124 based on the terminal interval information 412 .

In some embodiments, the storage unit 120 further stores interval error information. The interval error information is the difference between the clock cycle of the specified duration and the corresponding time segment. The electronic control unit 130 adjusts the first estimated time or the second estimated time according to the interval error information. Generally speaking, the processing system 100 can verify the crystal oscillator 132 and obtain the interval error information through an external electronic timer. The tester stores the interval error information into the storage unit 120 .

The electronic control unit 130 and the electronic timer perform timing within the same period of time. Here, take the electronic timer for 5 minutes as an example. The electronic control unit 130 clocks 306 seconds based on the crystal oscillator 132 and the external electronic timer clocks 300 seconds. Therefore, the electronic control component has an interval error information of (306-300)/300=0.02 seconds. If the electronic control element detects that there is interval error information in the storage unit 120, the electronic control element extracts the interval error information from the storage unit 120, and calculates the first estimated time (or first estimated time) based on the first-end interval information 411 (or the end-end interval information 412). second estimated time).

The processing system 100 and method for recording the event time of the electric tailgate 110 are used to record the event occurrence time when the electric tailgate 110 is operated. The electronic control component of the processing system 100 can record the interval count information of each controlled component 111 during operation through the built-in crystal oscillator 132 and interval counting. The electronic control component further calculates the first estimated time or the second estimated time of occurrence of each event based on the interval count information and the event record file 122 .

100:Processing system 110: Electric tailgate 111:Controlled component 120:Storage unit 121:Initial time information 122:Event record file 123: First interval information 124: Second interval information 130: Electronic control unit 131: Communication pin 132:Crystal oscillator 133: Processing unit 141:Control command 142:Trigger signal 143:External time information 411: Headend interval information 412: End interval information △1, △2: Difference S210~S270, S510~S570: steps

[Fig. 1] is a schematic diagram of the architecture of a processing system for recording event time of an electric tailgate according to an embodiment. [Fig. 2] is a flow chart of a processing method for recording the event time of an electric tailgate according to an embodiment. [Fig. 3A] is a schematic diagram of recording timing of interval count information according to an embodiment. [Fig. 3B] is a schematic diagram of another recording time point of interval count information according to an embodiment. [Fig. 4] is a schematic diagram of headend interval information, first estimated time and second estimated time according to an embodiment. [Fig. 5] is a flow chart of a processing method for recording the event time of the electric tailgate according to an embodiment. [Fig. 6] is a schematic diagram of terminal interval information, first estimated time and second estimated time according to an embodiment.

100:Processing system

110: Electric tailgate

111:Controlled component

120:Storage unit

121:Initial time information

122:Event record file

130: Electronic control unit

131: Communication pin

132:Crystal oscillator

133: Processing unit

141:Control command

142:Trigger signal

143:External time information

Claims (13)

A processing system for recording the event time of an electric tailgate, including: An electric tailgate includes a controlled component that responds to a trigger signal according to a control command; a storage unit that stores initial time information and an event record file; and An electronic control unit is electrically connected to the controlled element and the storage unit. The electronic control unit counts interval counting information. The electronic control unit receives the trigger signal responded by the controlled element. The electronic control unit records The interval count information when sending the control command is a first interval information, and the electronic control unit records the interval count information when receiving the trigger signal as a second interval information; Wherein, the electronic control unit associates the initial time information with the first end interval information of the event record file, and the electronic control unit calculates a first interval corresponding to the first interval information based on the initial time information and the first end interval information. Estimated time, or the electronic control unit calculates a second estimated time corresponding to the second interval information based on the initial time information and the first-end interval information. The processing system for recording the event time of an electric tailgate as described in claim 1, wherein the storage unit stores an interval error information, and the electronic control unit adjusts the first estimated time or the second estimated time based on the interval error information. time. The processing system for recording event time of an electric tailgate as described in claim 1, wherein the electronic control unit records the first estimated time or the second estimated time to the event record file. A processing system for recording the event time of an electric tailgate, including: An electric tailgate includes a controlled component that responds to a trigger signal according to a control command; a storage unit to store an event record file; and An electronic control unit is electrically connected to the controlled element and the storage unit. The electronic control unit counts interval counting information. The electronic control unit receives the trigger signal responded by the controlled element. The electronic control unit records The interval count information when sending the control command is a first interval information, and the electronic control unit records the interval count information when receiving the trigger signal as a second interval information. The electronic control unit sequentially records each of the first interval information. Recording one interval information and each second interval information to the event log file; Among them, the electronic control unit receives a time synchronization request, the time synchronization request includes an external time information, the electronic control unit obtains an end interval information from the event record file according to the time synchronization request, and the electronic control unit obtains end interval information according to the external time The information and the terminal interval information calculate a first estimated time corresponding to each of the first interval information, or the electronic control unit calculates a first estimated time corresponding to each of the second interval information based on the external time information and the terminal interval information. Second, estimate the time. The processing system for recording event time of an electric tailgate as described in claim 4, wherein the terminal interval information is the last first interval information or the last second interval information in the event record file. The processing system for recording the event time of an electric tailgate as described in claim 4, wherein the storage unit stores an interval error information, and the electronic control unit adjusts the first estimated time or the second estimated time based on the interval error information. time. The processing system for recording event time of an electric tailgate as described in claim 4, wherein the electronic control unit records the first estimated time or the second estimated time to the event record file. A processing method for recording the event time of an electric tailgate, including: Record initial time information of an electric tailgate; Count an interval count information by an electronic control unit at intervals, and record each interval count information into an event record file; The interval count information sent by the electronic control unit to record and send a control command is a first interval information; When the electronic control unit receives a trigger signal in response to the electric tailgate, the electronic control unit records the interval count information when receiving the trigger signal as second interval information; The electronic control unit loads the initial time information and corresponds to the first-end interval information of the event record file; The electronic control unit calculates a first estimated time corresponding to the first interval information based on the initial time information and the first-end interval information; and The electronic control unit calculates a second estimated time corresponding to the second interval information based on the initial time information and the first-end interval information. The processing method for recording the event time of an electric tailgate as described in claim 8, wherein the electronic control unit calculates the first estimated time and the second estimated time corresponding to the first interval information based on the initial time information. The steps include: The electronic control unit adjusts the first estimated time based on interval error information; and The electronic control unit adjusts the second estimated time based on the interval error information. The processing method for recording the event time of an electric tailgate as described in claim 8, wherein the step of the electronic control unit calculating the first estimated time and the second estimated time based on the initial time information includes: The electronic control unit records the corresponding first estimated time into the event record file based on the first interval information; and The electronic control unit records the corresponding second estimated time into the event record file according to the second interval information. A processing method for recording the event time of an electric tailgate, including: Count an interval count information by an electronic control unit at intervals, and record each interval count information into an event record file; The interval count information sent by the electronic control unit to record and send a control command is a first interval information; When the electronic control unit receives a trigger signal in response to the electric tailgate, the electronic control unit records the interval count information when receiving the trigger signal as second interval information; The electronic control unit records the first interval information and the second interval information sequentially to the event record file; The electronic control unit obtains a terminal interval information and an external time information of the event record file; The electronic control unit calculates a first estimated time corresponding to the first interval information based on the external time information and the terminal interval information; and The electronic control unit calculates a second estimated time corresponding to the second interval information based on the external time information and the terminal interval information. The processing method for recording the event time of an electric tailgate as described in claim 11, wherein the electronic control unit calculates the first estimated time and the second estimated time corresponding to the first interval information based on the initial time information. The steps include: The electronic control unit adjusts the first estimated time based on interval error information; and The electronic control unit adjusts the second estimated time based on the interval error information. The processing method for recording the event time of an electric tailgate as described in claim 11, wherein the step of the electronic control unit calculating the first estimated time and the second estimated time based on the initial time information includes: The electronic control unit records the corresponding first estimated time into the event record file according to the first interval information.

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