Electronic control device and electronic control method

Abstract

This electronic control device is provided with: a first ECU (10) that is connected to a sensor (30) capable of detecting an object in an open state of a main switch, and that has a first determination circuit that generates an internal trigger on the basis of a detection value of the sensor (30), and a second determination circuit that is activated in accordance with the internal trigger; and a second ECU (20) connected to the first ECU (10) via a communication line, in which the first determination circuit (11) is a circuit capable of operating at a low speed in a dormant state of the first ECU (10), and the second determination circuit (12) is a circuit that is activated in response to an internal trigger generated by the first determination circuit (11) and operates at a high speed to perform a filtering process, and the first determination circuit (11) is a circuit capable of operating at a low speed in response to an internal trigger generated by the second determination circuit (12). When the first ECU (10) and the second ECU (20) are in a dormant state, the first determination circuit (11) determines whether there is a change in the detection value and generates an internal trigger when it is determined that there is a change, and the second determination circuit (12) obtains an input value by filtering the detection value of the sensor (30) after being activated in accordance with the internal trigger, determines whether there is a change in the input value, and outputs the determined change in the input value. When it is determined that there is a change, a wake-up signal is transmitted to the second ECU (20).

Description

Technical Field

[0001] The invention relates to an electronic control device and an electronic control method.

[0002] This application claims priority based on Japanese patent application No. 2022-114225 filed on July 15, 2022. For designated countries that recognize incorporation by reference, the contents recorded in the above-mentioned application are incorporated into this application by reference as part of the records of this application. Background Art

[0003] In the past, a vehicle-mounted electronic system that suppresses power consumption during standby is known (for example, Patent Document 1). The vehicle-mounted electronic system described in Patent Document 1 includes: a standby ECU that performs standby action in an IG disconnected state; a plurality of non-standby ECUs that are normally dormant or shut down in an IG disconnected state; sensor wires and sensor signal lines, the sensor wires and sensor signal lines are arranged between each sensor and the standby ECU, the sensor wires are used to supply power from the standby ECU to each sensor, and the sensor signal lines import signals from each sensor to the standby ECU; and lines G2-G4, the lines G2-G4 are arranged between each non-standby ECU and the standby ECU, and are used to wake up each non-standby ECU, wherein the standby ECU responds to the input of the signal from the sensor and starts the non-standby ECU corresponding to the signal from the sensor via lines G2-G4.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2010-280314 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] However, in the above-mentioned in-vehicle electronic system, since the standby ECU connected to the sensor needs to maintain a normal activation state, there is a problem that the power consumed by the standby ECU increases.

[0009] The problem to be solved by the present invention is to provide an electronic control device and an electronic control method capable of suppressing the power consumption of an ECU connected to a sensor.

[0010] Solutions for solving problems

[0011] In the present invention, a first determination circuit capable of operating at a low speed when the first ECU and the second ECU are in a sleep state is used to determine whether the detection value has changed. When it is determined that there is a change, an internal trigger is generated. After the second determination circuit is started according to the internal trigger, the detection value of the sensor is filtered by the second determination circuit to obtain the input value, and it is determined whether the input value has changed. When it is determined that there is a change, a wake-up signal is sent to the second ECU, thereby solving the above-mentioned problem.

[0012] Effects of the Invention

[0013] According to the present invention, it is possible to suppress power consumption of an ECU connected to a sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a block diagram of an in-vehicle electronic control system according to one embodiment of the present invention.

[0015] Figure 2 is a flowchart showing a flow of control processing of the first ECU when the first ECU and the second ECU are in the sleep state.

[0016] Figure 3 1 is a flowchart showing a flow of control processing of the first ECU when the first ECU and the second ECU are in a normal activation state.

[0017] Figure 4 is a block diagram of a first determination circuit. DETAILED DESCRIPTION

[0018] Hereinafter, one embodiment of an electronic control device and an electronic control method according to the present invention will be described with reference to the drawings. Figure 1 This is a block diagram of an on-vehicle electronic control system according to an embodiment of the present invention. The on-vehicle electronic control system 100 includes a first ECU 10, a second ECU 20, and a sensor 30. The on-vehicle electronic control system 100 is provided in a vehicle and includes: a communication network for sending control signals to on-vehicle devices such as a battery, a motor, and a fan; and a control unit for controlling the on-vehicle devices. In addition, a device including at least the first ECU 10 and the second ECU 20 is equivalent to the "electronic control device" of the present invention, and the control process executed by the first ECU 10 is equivalent to the "electronic control method" of the present invention.

[0019] The first ECU 10 and the second ECU 20 are controllers (Electronic Control Unit: electronic control unit) for controlling vehicle-mounted devices, and the first ECU 10 and the second ECU 20 send control signals to the vehicle-mounted devices. In addition, multiple ECUs including the first ECU 10 and the second ECU can send and receive signals to each other. The first ECU 10 and the second ECU 20 have a memory storing a program for controlling the vehicle-mounted device, a processor for executing the program stored in the memory, and a communication module for communicating with the vehicle-mounted device and / or other ECUs. In addition, the vehicle-mounted electronic control system constructs a communication network that can communicate between multiple ECUs and / or between ECU and the vehicle-mounted device, and the node part of the communication network is connected to the ECU. The first ECU 10 and the second ECU 20 are in a slave node and a master node relationship, and the second ECU 20 is started according to the wake-up signal sent from the first ECU 10.

[0020] As an example, the vehicle-mounted electronic control system involved in this embodiment is applied to the following system. For example, the sensor 30 connected to the first ECU 10 is a sensor for detecting the user approaching the vehicle. The first ECU 10 and the second ECU 20 are triggered by the approach of the person and transfer from the sleep state to the normal start state to control the vehicle-mounted communication device so that wireless communication with the key or communication terminal owned by the user can be performed. In such a system, when the user approaches, the main switch (ignition switch or power switch) of the vehicle is in the off state, and the first ECU 10 and the second ECU 20 are both in the sleep state. Since a part of the circuit of the first ECU 10 is driven at a low speed, the first ECU 10 determines the change of the input value from the sensor 30 to the input port of the first ECU 10 even in the sleep state. In this state, when the sensor 30 detects the approach of the person, the first ECU 10 uses an internal trigger to start the high-speed drive circuit included in the first ECU 10 according to the change of the input value to the input port. In addition, the first ECU 10 sends a wake-up signal to the second ECU 20 to transfer the second ECU 20 from the sleep state to the normal start state. When the second ECU 20 is in the normal start state, the second ECU 20 is in a state capable of controlling the vehicle-mounted communication device. Thus, the vehicle-mounted electronic control system can wirelessly communicate with the key or communication terminal owned by the user. Next, each structure of the vehicle-mounted electronic control system involved in this embodiment is described.

[0021] like Figure 1As shown, the first ECU 10 is connected to the sensor 30, and the first ECU 10 has: a first determination circuit 11, which generates an internal trigger based on the detection value of the sensor 30; and a second determination circuit 12, which is activated according to the internal trigger. The first ECU 10 is connected to the second ECU 20 through a communication line. The first determination circuit 11 is a circuit that can operate at a low speed in the sleep state of the first ECU 10. The first determination circuit 11 does not perform AD conversion that operates with a high-speed clock and filtering processing that performs calculation processing with a high-speed clock. In addition, the first ECU 10 determines whether the detection value of the sensor 30 has changed, and generates an internal trigger when it is determined that there is a change. The detection value of the sensor 30 is input to the input port of the first ECU 10 in the form of an analog value. The first ECU 10 obtains the detection value of the sensor 30 at a predetermined period (for example, 50msec) in conjunction with the low-speed clock, and compares the previous value of the detection value of the sensor 30 with the current value.

[0022] The detection value of the sensor 30 is an analog value. In order to determine the change of the detection value, the first ECU 10 sets a prescribed range including the previous value of the detection value, and determines whether the current value of the detection value is within the prescribed range including the previous value. The prescribed range including the previous value indicates the width of the allowable value of the change relative to the previous value of the detection value. For example, when the previous value is set to 2V, the prescribed range is set to +1V to +3V. For example, the first ECU 10 only needs to set the prescribed range in such a way that the previous value becomes the central value of the prescribed range. Moreover, when the current value of the detection value is within the prescribed range, the first ECU 10 determines that the detection value has not changed. On the other hand, when the current value of the detection value is outside the prescribed range, the first ECU 10 determines that the detection value has changed. When the first ECU 10 determines that the detection value of the sensor 30 has changed, the changed detection value is stored in the memory as the previous value. In addition, when the first ECU 10 determines that the detection value of the sensor 30 has changed, an internal trigger is generated. The internal trigger is a command for causing the second determination circuit 12 to shift from the sleep state to the normal activation state, in other words, a command for activating a part of the circuit in the first ECU 10 .

[0023] The second determination circuit 12 is a circuit that is activated according to an internal trigger generated by the first determination circuit 11 and operates at high speed to perform filtering processing. The second determination circuit 12 operates at a clock faster than the operation clock of the first determination circuit 11, so the power consumption of the second determination circuit 12 is higher than the power consumption of the first determination circuit 11. When the first ECU 10 is in a sleep state, the second determination circuit 12 is in a non-activated state (sleep state or rest state), so the power consumption of the first ECU 10 is suppressed.

[0024] The second determination circuit 12 obtains the detection value of the sensor 30 at a predetermined period (for example, 10 msec) in conjunction with a high-speed clock, and performs filtering processing on the acquired detection value, thereby obtaining an input value, and determining whether the input value has changed. In the filtering process, the detection value is AD-converted, and a value with continuity is set as the input value while maintaining the continuity of the converted detection value. For example, when the same detection value is input three times in a row, the second determination circuit 12 sets the input detection value as the input value. For example, if the detection value after AD conversion is 000 or 001, the input value is "0", and when the detection value is input three times in a row like 111, the input value is "1". In this way, the second determination circuit 12 performs filtering processing to check the continuity of the detection value input in conjunction with the high-speed clock. In addition, noise removal and the like may also be included in the filtering process.

[0025] The second determination circuit 12 compares the current value of the input value with the previous value to determine whether the input value has changed. When the current value of the input value is consistent with the previous value, the second determination circuit 12 determines that the input value has not changed. In addition, when the second determination circuit 12 determines that the input value has not changed, it transfers from the normal startup state to the sleep state. In addition, the second determination circuit 12 can also output a state signal indicating that the state has been transferred from the normal startup state to the sleep state to the first determination circuit 11.

[0026] The second determination circuit 12 generates a communication event when it is determined that the input value has changed. In the communication event, data is sent from the first ECU 10 to the second ECU 20. At this time, when the second ECU 20 is in a sleep state, the second determination circuit 12 sends a wake-up signal to the second ECU 20. Then, after the second ECU 20 is transferred from the sleep state to the normal start state, the second determination circuit 12 sends an event occurrence instruction to the second ECU 20. The event occurrence instruction indicates that there is a change in the input value (equivalent to the detection value of the sensor 30) to the input port of the first ECU 10. In addition, when the second ECU 20 is in a normal start state, the second determination circuit 12 may not send a wake-up signal to the second ECU 20. Moreover, when the second determination circuit 12 determines that the input value has changed, the changed input value is stored in the memory as the previous value.

[0027] The second ECU 20 shifts the sleep state to the normal start state when receiving the wake-up signal from the first ECU 10. In addition, the second ECU 20 controls the vehicle-mounted device according to the communication event. The sensor 30 is a sensor that can detect an object even when the main switch is off and not limited to the on state of the main switch. The sensor 30 is, for example, a camera, an infrared sensor, a radar, etc. The detection object of the sensor can be any object that moves, such as a user.

[0028] Next, refer to Figure 2 The circuit structure of the first determination circuit 11 is described below. Figure 2 As shown, the first determination circuit 11 includes a memory 111 , an adding circuit 112 , a subtracting circuit 113 , a selecting circuit 114 , a switching circuit 115 , a D / A converter 116 , a comparator 117 , and a control determination circuit 118 .

[0029] When it is determined that the detection value has changed, the memory 111 stores the changed detection value as the previous value. The addition circuit 112 sets the upper limit value of the specified range representing the allowable value by adding the specified value to the previous value. The subtraction circuit 113 sets the lower limit value of the specified range representing the allowable value by subtracting the specified value from the previous value. The addition circuit 112 and the subtraction circuit 113 are circuits that perform operations on a specified range including the previous value of the detection value, and are equivalent to the "operation circuit" of the present invention. The selection circuit 114 cooperates with the output of the switching circuit 115 to select the operation value of the addition circuit 112 and the operation value of the subtraction circuit 113, and outputs the selected operation value to the D / A converter 116.

[0030] The switching circuit 115 switches the selection method of the selection circuit 114 and the determination method of the control decision circuit 118 in accordance with the low-speed clock. For example, the switching circuit 115 outputs a switching signal to the selection circuit 114 so that the selection circuit 114 selects the operation value of the addition circuit 112 in accordance with the high level of the low clock and the selection circuit 114 selects the operation value of the subtraction circuit 113 in accordance with the low level of the low clock.

[0031] The D / A converter 116 converts the output value (digital value) of the selection circuit 114 into an analog value and outputs it to the comparator 117. The D / A converter 116 is a circuit that uniquely determines the output value for the value input from the selection circuit 114, and does not require a clock. The comparator 117 compares the input voltage (analog value) input from the sensor 30 to the input port of the first ECU 10 with the value input from the D / A converter 116, and outputs the comparison result to the control determination circuit 118. In addition, an intermittent voltage is supplied from the vehicle-mounted battery to the comparator 117, and an intermittent voltage is also supplied to the sensor 30. The control decision circuit 118 determines whether there is a change in the detection value of the sensor 30 based on the comparison result between the value input to the comparator 117 from the D / A converter 116 based on the calculation value of the addition circuit 112 and the voltage input to the comparator 117 from the sensor 30, and the comparison result between the value input to the comparator 117 from the D / A converter 116 based on the calculation value of the subtraction circuit 113 and the voltage input to the comparator 117 from the sensor 30, and outputs a signal corresponding to the determination result as a detection signal.

[0032] In this way, the first determination circuit 11 intermittently monitors the input to the input port of the first ECU 10 using a low-speed clock. During intermittent monitoring, no operation processing or filtering processing for AD conversion is performed, so power consumption is suppressed. Moreover, when the input to the input port changes, the second determination circuit 12, which is a circuit that performs operation processing and filtering processing for AD conversion in the first ECU 10 as a slave node, is started. Then, based on the result of the filtering processing, it is determined whether the input (analog value) to the input port has changed. If there is a change, a wake-up signal is sent to the second ECU 20. On the other hand, if there is no change, the first ECU 10 does not send a wake-up signal, and returns the second determination circuit to the sleep state, and continues the intermittent monitoring by the first determination circuit 11.

[0033] Next, refer to Figure 3 and Figure 4 The control processing flow of the first ECU 10 will be described. Figure 3 FIG. 2 shows a control flow when the first ECU 10 and the second ECU 20 are in a sleep state. Figure 4 The control flow in the case where the first ECU 10 and the second ECU 20 are in a normal activation state is shown.

[0034] like Figure 3As shown, in step S1, the first ECU 10 obtains the detection value of the sensor 30 input to the input port. In step S2, the first ECU 10 compares the current value of the detection value with the previous value using the first determination circuit 11 to determine whether the detection value has changed. The first ECU 10 ends the control process when it is determined that the detection value has not changed. In addition, the first ECU 10 and the second ECU 20 remain in a dormant state.

[0035] On the other hand, when the first ECU 10 determines that the detection value has changed, it generates an internal trigger for starting the second determination circuit 12 in step S3. In addition, the first ECU 10 stores the changed detection value as the previous value in the memory. In step S4, the second determination circuit 12 is started (wakes up). In step S5, the first ECU 10 uses the second determination circuit 12 to filter the detection value of the sensor 30, thereby obtaining the input value. The first ECU 10 uses the second determination circuit 12 to compare the current value of the input value with the previous value to determine whether the input value has changed. When the first ECU 10 determines that the input value has changed, it sends a wake-up signal for starting the second ECU 20 to the second ECU 20 (step S7). In addition, the first ECU 10 stores the changed input value as the previous value in the memory. Then, the first ECU 10 ends the control process.

[0036] When the first ECU 10 determines that there is no change in the input value, it puts the second determination circuit 12 into the sleep state in step S8 and ends the control process.

[0037] When the main switch is turned on and the first ECU 10 and the second ECU 20 are in a normal startup state, the first ECU 10 executes Figure 4 The control process flow shown in FIG. 1 is as follows. Since the second determination circuit 12 is in a normal start-up state, the filtering process functions effectively. In step S11, the first ECU 10 performs filtering on the detection value of the sensor 30 using the second determination circuit 12 to obtain an input value.

[0038] In step S12, the first ECU 10 compares the current value of the input value with the previous value using the second determination circuit 12 to determine whether the input value has changed. When the first ECU 10 determines that the input value has changed, it sends an event occurrence instruction to the second ECU 20 (step S13). In addition, the first ECU 10 stores the changed input value as the previous value in the memory. Then, the first ECU 10 ends the control process. When the first ECU 10 determines that the input value has not changed, it ends the control process.

[0039] As described above, the electronic control device involved in the present embodiment includes: a first ECU 10 connected to a sensor 30 capable of detecting an object in the off state of the main switch; and a second ECU 20 connected to the first ECU 10 through a communication line. The first ECU 10 includes a first determination circuit 11 that generates an internal trigger based on the detection value of the sensor 30, and a second determination circuit 12 that is activated according to the internal trigger. The first determination circuit 11 is a circuit that can operate at a low speed in the sleep state of the first ECU 10, and the second determination circuit 12 is a circuit that is activated according to the internal trigger generated by the first determination circuit 11 and operates at a high speed to perform filtering processing. Moreover, when the first ECU 10 and the second ECU 20 are in the sleep state, the first determination circuit 11 determines whether the detection value has changed, and generates an internal trigger when it is determined that there is a change. After the second determination circuit 12 is activated according to the internal trigger, it obtains an input value by filtering the detection value of the sensor 30, and determines whether the input value has changed. When it is determined that there is a change, a wake-up signal is sent to the second ECU. Thus. The first ECU 10 can determine whether the detection value has changed with low power consumption, and can activate the second ECU 20 with low power consumption when the detection value has changed. As a result, the power consumption of the first ECU 10 connected to the sensor 30 can be suppressed.

[0040] In addition, the electronic control method involved in the present embodiment is executed by the processor included in the first ECU. In the electronic control method, when the first ECU 10 and the second ECU 20 are in a dormant state, the first determination circuit 11 is used to determine whether the detection value of the sensor 30 has changed. When it is determined that there is a change, an internal trigger is generated. After the second determination circuit 12 is activated according to the internal trigger, the detection value of the sensor 30 is filtered by the second determination circuit 12 to obtain an input value, and it is determined whether the input value has changed. When it is determined that there is a change, a wake-up signal is sent to the second ECU 20. As a result, the first ECU 10 can determine whether the detection value has changed with low power consumption, and can start the second ECU 20 with low power consumption when the detection value has changed. As a result, the power consumption of the first ECU 10 connected to the sensor 30 can be suppressed.

[0041] In addition, in the electronic control device involved in this embodiment, when the second determination circuit 12 determines that the input value has changed, it stores the changed input value as the previous value, and compares the input value with the previous value to determine whether the input value has changed. Thus, the second determination circuit 12 can detect the change of the detection value of the sensor 30 in two stages, and can start the determination circuit according to the stage. As a result, the dark current can be reduced in two stages.

[0042] In addition, in the electronic control device involved in the present embodiment, when the first ECU 10 and the second ECU 20 are in the normal startup state, the second determination circuit 12 determines whether the input value obtained by filtering the detection value of the sensor 30 has changed, and sends an event occurrence instruction to the second ECU 20 when it is determined that there is a change. That is, the first ECU 10 does not need to send the event occurrence instruction regularly, and only needs to send the event occurrence instruction when the input value changes. As a result, the power consumption of the first ECU 10 can be suppressed.

[0043] In the electronic control device according to the present embodiment, the first determination circuit 11 determines at a predetermined period whether the detection value of the sensor 30 has changed. This allows the detection value to be determined at a low clock rate, thereby reducing power consumption of the first ECU 10.

[0044] In addition, in the electronic control device according to the present embodiment, when the first determination circuit 11 determines that there is a change, it stores the detected value after the change as the previous value, and determines whether there is a change based on whether the current value of the detected value is within a prescribed range including the previous value. Thus, even if the input to the input port is an analog value, it is possible to determine whether the detected value has changed.

[0045] In the electronic control device according to the present embodiment, the second determination circuit 12 shifts to the sleep state when determining that the input value obtained by filtering the detection value of the sensor 30 has not changed. This can suppress the power consumption of the second ECU 20.

[0046] In addition, in the electronic control device according to the present embodiment, the first determination circuit 11 includes: a memory 111, which stores the detected value after the change as the previous value when it is determined that there is a change; an operation circuit, which operates a predetermined range including the previous value; and a comparator 117, which compares the detected value with the operation value of the operation circuit. Thus, even if the input to the input port is an analog value, it is possible to determine whether the detected value has changed.

[0047] In addition, the embodiments described above are described to facilitate understanding of the present invention, and are not described to limit the present invention. Therefore, the gist of each element disclosed in the above embodiments is to include all design changes and equivalents belonging to the technical scope of the present invention.

[0048] Description of Reference Numerals

[0049] 10: first ECU; 11: first determination circuit; 12: second determination circuit; 20: second ECU; 30: sensor; 100: vehicle electronic control system; 111: memory; 112: addition circuit; 113: subtraction circuit; 114: selection circuit; 115: switching circuit; 116: D / A converter; 117: comparator; 118: control decision circuit.

Claims

1. An electronic control device comprising: A first electronic control unit, namely a first ECU, is connected to a sensor capable of detecting an object in an OFF state of the main switch, and has a first determination circuit that generates an internal trigger based on a detection value of the sensor, and a second determination circuit that is activated according to the internal trigger; and The second electronic control unit is the second ECU, which is connected to the first ECU via a communication line. in, The first determination circuit is a circuit that can operate at a low speed in a sleep state of the first ECU. The second determination circuit is a circuit that is activated according to the internal trigger generated by the first determination circuit and operates at high speed to perform filtering processing. When the first ECU and the second ECU are in a sleep state, The first determination circuit determines whether the detection value has changed, and generates the internal trigger when it is determined that there is a change, and, After being activated according to the internal trigger, the second determination circuit obtains an input value by filtering the detection value, determines whether the input value has changed, and sends a wake-up signal to the second ECU when it is determined that there is a change.

2. The electronic control device according to claim 1, wherein: When the second determination circuit determines that the input value has changed, the second determination circuit stores the input value after the change as the previous value. The second determination circuit compares the input value with the previous value to determine whether the input value has changed.

3. The electronic control device according to claim 1 or 2, wherein: When the first ECU and the second ECU are in a normal startup state, The second determination circuit determines whether an input value obtained by filtering the detection value has changed, and sends an event occurrence instruction to the second ECU if it is determined that there has been a change.

4. The electronic control device according to claim 1 or 2, wherein: The first determination circuit determines whether or not the detection value has changed at a predetermined period.

5. The electronic control device according to claim 1 or 2, wherein: When the first determination circuit determines that there is a change, the detected value after the change is stored as the previous value. The presence or absence of a change is determined based on whether the current value of the detection value is within a predetermined range including the previous value.

6. The electronic control device according to claim 5, wherein: The previous value is a median value of the predetermined range.

7. The electronic control device according to claim 5, wherein: When the current value of the detection value is outside the predetermined range, the first determination circuit determines that there is a change.

8. The electronic control device according to claim 1 or 2, wherein: The second determination circuit shifts to a sleep state when determining that the input value has not changed.

9. The electronic control device according to claim 1 or 2, wherein: The first determination circuit has: a memory, wherein when it is determined that there is a change, the memory stores the detected value after the change as a previous value; an operation circuit for performing an operation within a prescribed range including the previous value; and A comparator compares the detection value with an operation value of the operation circuit.

10. An electronic control method, executed by a processor included in a first electronic control unit (i.e., a first ECU), wherein: The first ECU is connected to a sensor capable of detecting an object in an OFF state of the main switch. The first ECU is connected to a second electronic control unit, namely a second ECU, through a communication line. The first ECU includes a first determination circuit that generates an internal trigger based on a detection value of the sensor, and a second determination circuit that is activated according to the internal trigger. The first determination circuit is a circuit that can operate at a low speed in a sleep state of the first ECU. The second determination circuit is a circuit that is activated according to the internal trigger generated by the first determination circuit and operates at high speed to perform filtering processing. The processor performs the following processing: When the first ECU and the second ECU are in a dormant state, the first determination circuit is used to determine whether the detection value has changed, and the internal trigger is generated when it is determined that there is a change; After the second determination circuit is activated according to the internal trigger, the detection value is filtered by the second determination circuit to obtain an input value; and It is determined whether the input value has changed, and if it is determined that there is a change, a wake-up signal is sent to the second ECU.

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