JP7347996B2 - Abnormality detection device and electronic key - Google Patents

Description

The present invention relates to an abnormality detection device and electronic key that detect whether or not a vibration sensor has an abnormality.

2. Description of the Related Art Conventionally, electronic key systems have been known that control a vehicle through wireless communication between an electronic key carried by a user and an on-vehicle device mounted on the vehicle. As an electronic key system, a smart verification system is well known in which an electronic key automatically responds to radio waves transmitted from an in-vehicle device and performs ID verification through wireless communication.

Patent Document 1 discloses a technique in which a vibration sensor is mounted on an electronic key and the operation of the electronic key is controlled based on the detection result of the vibration sensor. The vibration sensor outputs a vibration detection signal to a microcomputer provided in the electronic key. Based on the output of the vibration sensor, the microcomputer switches on/off the state of power supply to electronic components such as the vibration sensor, depending on whether or not the electronic key is vibrating. As a result, during normal use when the electronic key is given movement, power is turned on to the electronic components and the smart verification system can be executed. On the other hand, when the electronic key is not moving and is not in use, the power supply to the electronic components is turned off, keeping power consumption low.

JP2013-37632A

By the way, if vibration cannot be detected due to a failure of the vibration sensor, for example, the power supply state of the electronic key cannot be switched. Therefore, when the user uses the electronic key, the power supply remains off, so there is a concern that the smart verification system cannot be executed and the system cannot operate according to the user's intention.

An object of the present invention is to provide an abnormality detection device and an electronic key that enable operation according to the user's intention.

An abnormality detection device for solving the above problems performs a self-diagnosis in which a vibration sensor connected through a first communication line vibrates itself to diagnose whether the vibration sensor is normal or not. A diagnosis unit that causes the vibration sensor to perform the self-diagnosis through a second communication line different from the first communication line, and a detection result detected by the vibration sensor with its own vibration detection function unit during the self-diagnosis. and a determination unit that determines whether the vibration sensor is normal based on the diagnosis result by the diagnosis unit and the detection result acquired by the acquisition unit.

An electronic key for solving the above problems includes a key function section that performs ID verification through wireless communication with a communication partner, and a vibration sensor that vibrates itself through a first communication line. a diagnosis unit that causes the vibration sensor to perform a self-diagnosis to determine whether or not it is normal through communication through the first communication line; and a diagnosis unit that causes the vibration sensor to perform a self-diagnosis to determine whether the vibration is normal or not; an acquisition unit that acquires a detection result through a second communication line different from the first communication line, a diagnosis result by the diagnosis unit, and the detection result acquired by the acquisition unit, the vibration sensor A determination unit that determines whether or not it is normal.

The abnormality detection device and electronic key of the present invention enable operation according to the user's intention.

FIG. 2 is a block diagram showing the configuration of an abnormality detection device provided in the electronic key. FIG. 3 is a schematic diagram illustrating operation switching when a user uses an electronic key. A processing flow diagram of a microcomputer when an electronic key is not used. A processing flow diagram of the vibration sensor when the electronic key is not used.

An embodiment of an abnormality detection device and an electronic key will be described below with reference to FIGS. 1 to 4.
As shown in FIG. 1, the electronic key system for a vehicle includes an electronic key 1 that performs ID verification through wireless communication with an authentication device on the vehicle side (not shown) through wireless communication. The electronic key system of this example performs smart verification in which ID verification is performed wirelessly in response to communication from the vehicle. In the electronic key system, a series of ID verifications are automatically performed between the electronic key 1 and the in-vehicle device through mutual communication, and the operation of the in-vehicle device is permitted or executed on the condition that the ID verification is successful. .

The electronic key 1 includes a microcomputer 10 that controls the operation of the electronic key 1. The microcomputer 10 is provided with a key function section 11 that executes an operation similar to ID verification on the electronic key 1. The key function unit 11 executes ID verification communication operations such as transmitting an electronic key ID to the vehicle during ID verification communication.

The electronic key 1 includes an LF receiving section 12 that receives radio waves in the LF band (LF: Low Frequency), and an RF transmitting section 13 that transmits radio waves in the RF band (RF: Radio Frequency). The LF receiver 12 uses, for example, a three-axis coil antenna. For the RF transmitter 13, for example, an RFIC (IC: Integrated Circuit) is used. The LF receiving section 12 and the RF transmitting section 13 are controlled by the microcomputer 10.

In smart verification, when the LF receiving section 12 receives the LF radio wave transmitted from the vehicle authentication device, the key function section 11 transmits a response thereto from the RF transmitting section 13 . Thereby, the key function unit 11 starts a series of ID verifications through LF-RF mutual communication with the authentication device. In a series of ID verifications, the key function unit 11 transmits the electronic key ID registered to itself by RF. When the authentication device confirms that the received electronic key ID is successfully verified and various types of authentication such as challenge-response authentication with the key function unit 11 are successful, the authentication device determines that the ID verification is successful. When the ID verification is completed, the operation of the in-vehicle device is permitted or executed. This makes it possible to lock and unlock vehicle doors and start the engine. Further, the key function section 11 may be configured to be capable of transmitting the electronic key ID by RF, for example, by operating a push button (not shown) provided on the electronic key 1.

The electronic key 1 includes a vibration sensor 20 that detects vibrations occurring in the electronic key 1. The key function section 11 of the microcomputer 10 has a switching function that switches the operation of the electronic components of the electronic key 1 according to vibration. In this example, the key function unit 11 determines whether or not the electronic key system can be executed by switching the operation of the electronic components between when the electronic key 1 is in use and when the electronic key 1 is not in use. Switch.

The microcomputer 10 and the vibration sensor 20 are connected by a first communication line 31 and a second communication line 32 that are different from each other. The first communication line 31 is capable of performing, for example, synchronous serial communication, and connects the microcomputer 10 and the vibration sensor 20 so that they can communicate with each other. The second communication line 32 is, for example, an interrupt signal line for outputting an interrupt signal from the vibration sensor 20 to the microcomputer 10.

The vibration sensor 20 is, for example, an acceleration sensor, and detects an acceleration value. An example of a method for detecting the acceleration value is a capacitance method using a movable electrode and a fixed electrode provided on the vibration sensor 20. In the capacitance method, the acceleration value is calculated based on the change in capacitance between the electrodes in response to the displacement of the movable electrode due to vibration.

The vibration sensor 20 includes a detection function section 21 that outputs the detection result of detecting its own vibration to the microcomputer 10 through the second communication line 32. The detection function unit 21 outputs a comparison result as to whether the acceleration value due to vibration is larger than a set threshold value. The detection function unit 21 outputs the comparison result as a binary vibration of High/Low, for example, and outputs a High signal when the detected vibration is larger than a threshold value. In the second communication line 32, a High signal is the output of an interrupt signal, and a Low signal is no output of the interrupt signal.

Further, the vibration sensor 20 is capable of outputting various information to the microcomputer 10 through the first communication line 31. Examples of the various information include currently detected acceleration values, history of acceleration values, output history of interrupt signals, and combinations thereof.

When the key function section 11 receives an interrupt signal from the vibration sensor 20 via the second communication line 32, it recognizes that the electronic key 1 is in a use state where there is movement. When the key function unit 11 recognizes that it is in use, it switches its operation to permit execution of the electronic key system. In this example, the key function section 11 switches from the communication function off state to the communication function on state, activates the LF reception section 12, and waits for reception of LF radio waves, for example. Further, the key function unit 11 recognizes that the electronic key 1 is in an unused state where there is no movement, for example, when a state in which no interrupt signal is input continues for a certain period of time. The key function unit 11 switches its operation to stop the electronic key system on one condition that it is recognized that the electronic key system is not in use. In this example, the key function section 11 switches from the communication function on state to the communication function off state, for example, prohibits the operation of the LF receiver section 12 and makes it impossible to receive LF radio waves. In this way, the key function unit 11 uses the interrupt function of the vibration sensor 20 to switch the operation.

The electronic key 1 includes an abnormality detection device 40 that detects an abnormality in the vibration sensor 20. The reason why the abnormality detection device 40 is provided in the electronic key 1 is that an interrupt signal may not be inputted due to poor sensitivity of the vibration sensor 20 or an abnormality in the interrupt function. Note that the abnormality in the interrupt function includes an abnormality in the threshold value determination of the detection function section 21, an abnormality in the second communication line 32, and the like.

The abnormality detection device 40 includes a diagnosis section 41 that causes the vibration sensor 20 to perform self-diagnosis using the first communication line 31. The diagnostic section 41 is provided in the microcomputer 10. The vibration sensor 20 also includes a self-diagnosis section 42 that performs self-diagnosis on the vibration sensor 20. The diagnosis unit 41 outputs a diagnosis request to the vibration sensor 20 via the first communication line 31. When the self-diagnosis section 42 receives a diagnosis request, it causes the vibration sensor 20 to generate a predetermined vibration for self-diagnosis. Then, the self-diagnosis section 42 outputs the acceleration value detected when the specified vibration is generated to the microcomputer 10 via the first communication line 31 as a diagnosis result. The diagnostic unit 41 compares the input acceleration value with the expected value k and performs diagnosis to check whether the acceleration value is normal or not. Note that the expected value k is an acceleration value detected by the normal vibration sensor 20 when a specified vibration is generated.

The abnormality detection device 40 includes an acquisition section 43 that acquires, through the second communication line 32, an interrupt signal output by the detection function section 21 during self-diagnosis. The acquisition unit 43 is provided in the microcomputer 10. During self-diagnosis, the diagnostic unit 41 of this example switches the threshold value used in vibration detection by the detection function unit 21 to a value lower than the normal value. The threshold value set at this time is preferably a value lower than the expected value k, for example. The abnormality detection device 40 determines whether or not there is an abnormality in the vibration sensor 20 based on whether or not the acquisition unit 43 has been able to acquire an interrupt signal output from the detection function unit 21 for which such a threshold value has been set.

The abnormality detection device 40 includes a determination unit 44 that determines whether or not there is an abnormality in the vibration sensor 20 using the outputs of the detection function unit 21 and the self-diagnosis unit 42 of the vibration sensor 20. The determination unit 44 is provided in the microcomputer 10. The determination unit 44 determines whether the vibration sensor 20 is normal based on the diagnosis result by the diagnosis unit 41 and the interrupt signal acquired by the acquisition unit 43. The determination unit 44 determines that the vibration sensor 20 is normal when the diagnosis result by the diagnosis unit 41 is normal and the acquisition unit 43 acquires the interrupt signal. The key function section 11 switches the operation based on the determination result of the determination section 44.

The operation of this embodiment will be explained below. First, operation switching by the key function section 11 will be explained using FIG. 2. First, the process when the user normally uses the electronic key 1 will be described using FIG. 2.

As shown in FIG. 2, in S101 (S is an abbreviation for step, the same applies hereinafter), the microcomputer 10 waits for input of an interrupt signal from the vibration sensor 20. The detection function section 21 of the vibration sensor 20 outputs an interrupt signal when the detected acceleration value is larger than the threshold value T1. On the other hand, the detection function unit 21 does not output an interrupt signal when the acceleration value is less than or equal to the threshold value T1. Normally, when a user uses the electronic key 1, he/she moves to the vehicle while holding the electronic key 1, so the electronic key 1 vibrates. Therefore, the acceleration value becomes larger than the threshold value T1, and the detection function section 21 outputs an interrupt signal.

In S102, when the key function section 11 of the microcomputer 10 receives an interrupt signal from the vibration sensor 20, it permits execution of the electronic key system. In the case of this example, the key function section 11 switches from a communication function off state to a communication function on state, and switches the LF receiving section 12 from an off state to an on state, thereby making it possible to receive LF radio waves. Furthermore, when the communication function is on, the key function section 11 maintains that state. The key function unit 11 maintains the communication function ON state for a certain period of time after the interrupt signal is input. Therefore, when the user uses the electronic key 1, the electronic key system can be executed.

Next, with reference to FIGS. 3 and 4, a process to be performed when the electronic key 1 is left unused, such as when it is left in a storage location, will be described.
As shown in FIG. 3, in S201, the microcomputer 10 measures the elapsed time since the last interrupt signal was input. When a certain period of time has elapsed without any input, the diagnostic unit 41 starts executing self-diagnosis and proceeds to S202. Note that during the self-diagnosis process, the key function unit 11 transitions to a diagnosis mode different from normal. In the diagnostic mode, the key function section 11 does not switch operations.

In S202, the diagnostic unit 41 outputs a diagnostic request to the vibration sensor 20 via the first communication line 31 when a certain period of time has elapsed without inputting an interrupt signal. Furthermore, the diagnostic unit 41 outputs a change command for changing the vibration detection threshold of the detection function unit 21 by including it in the diagnostic request. In response to the change command, the diagnostic unit 41 changes the threshold value of the detection function unit 21 to a diagnostic threshold value “T2” that is smaller than the normal threshold value “T1”. Further, the threshold value T2 is smaller than the expected value k.

As shown in FIG. 4, in S301, the vibration sensor 20 receives a diagnosis request from the microcomputer 10. When the vibration sensor 20 receives the diagnosis request, it starts self-diagnosis and proceeds to S302.

In S302, upon input of the diagnosis request, the detection function unit 21 of the vibration sensor 20 changes the threshold value T1 to the threshold value T2 according to the change command included in the diagnosis request. When the vibration sensor 20 changes the threshold value, the process moves to S303.

In S303, the self-diagnosis section 42 of the vibration sensor 20 generates prescribed vibration for self-diagnosis. The self-diagnosis unit 42 generates, for example, a fixed vibration in a capacitance type movable electrode as the prescribed vibration. When the vibration sensor 20 generates the specified vibration, the process moves to S304.

In S304, the self-diagnosis unit 42 of the vibration sensor 20 outputs the detected acceleration value to the microcomputer 10 via the first communication line 31 when the specified vibration is generated. After the vibration sensor 20 outputs the acceleration value, the process moves to S305.

In S305, the detection function unit 21 of the vibration sensor 20 compares the detected acceleration value with the threshold value T2 when the specified vibration is generated. If the acceleration value is larger than the threshold T2, the detection function unit 21 moves to S306. On the other hand, when the acceleration value is less than or equal to the threshold value T2, the detection function unit 21 does not output an interrupt signal and ends the process. Here, the threshold value T2 is set to a value smaller than the expected value k, that is, the acceleration value detected by the normal vibration sensor 20 when the specified vibration occurs. Therefore, if the vibration sensor 20 is normal, the acceleration value will be larger than the threshold value T2.

In S306, the detection function unit 21 outputs an interrupt signal to the microcomputer 10 via the second communication line 32 if the acceleration value is larger than the threshold T2. When the vibration sensor 20 outputs the interrupt signal, the vibration sensor 20 ends the process. Note that the detection function unit 21 returns the threshold value T2 to the original threshold value T1 when the processing is completed, regardless of whether or not an interrupt signal is output.

Returning to FIG. 3, in S203, the diagnosis unit 41 of the microcomputer 10 receives the acceleration value outputted from the vibration sensor 20 in S304 and compares the acceleration value with the expected value k. Note that, at this point, the determination unit 44 does not yet confirm whether or not an interrupt signal is input. The diagnostic unit 41 calculates the difference between the acceleration value and the expected value k, and if this difference is within an allowable range, confirms that the acceleration value is normal. When the diagnostic unit 41 confirms that the acceleration value is normal, the diagnostic unit 41 determines that the diagnosis result is normal and moves to S204. On the other hand, if the difference between the acceleration value and the expected value k is out of the allowable range, the diagnostic unit 41 confirms that the acceleration value is abnormal. Furthermore, when the acceleration value is not input, the diagnostic unit 41 confirms that the acceleration value is abnormal. When the diagnostic unit 41 confirms that the acceleration value is abnormal, it determines that the diagnosis result is abnormal and moves to S206.

In S204, the determination unit 44 of the microcomputer 10 checks whether the acquisition unit 43 has acquired the interrupt signal from the vibration sensor 20. In S305 described above, since the acceleration value is larger than the threshold value T2 during normal operation, the acquisition unit 43 acquires the interrupt signal from the detection function unit 21. When the acquisition unit 43 acquires the interrupt signal, the determination unit 44 moves to S205. On the other hand, if there is an abnormality in the detection function section 21, if the second communication line 32 is disconnected, or if the output of the second communication line 32 is stuck, an event may occur in which the interrupt signal cannot be correctly acquired. If the acquisition unit 43 does not acquire the interrupt signal, the determination unit 44 moves to S206.

In S205, the determination unit 44 determines that the vibration sensor 20 is normal if the diagnosis result of the diagnosis unit 41 is normal and the acquisition unit 43 acquires the interrupt signal. If the determination unit 44 determines that the vibration sensor 20 is normal, the determination unit 44 validates the vibration sensor 20 and permits switching of the key function unit 11 . When the vibration sensor 20 is enabled, the key function unit 11 switches to the communication function off state on one condition that no interrupt signal is input for a certain period of time. This eliminates unnecessary power consumption when the electronic key 1 is stored. Moreover, when the electronic key 1 is stored, the electronic key 1 does not operate in a place not intended by the user.

In S206, the determination unit 44 determines that the vibration sensor 20 is abnormal when the diagnosis result of the diagnosis unit 41 is abnormal, or when the acquisition unit 43 does not acquire the interrupt signal. When determining that the vibration sensor 20 is abnormal, the determination unit 44 disables the vibration sensor 20. When the vibration sensor 20 is disabled, the key function unit 11 switches to the communication function ON state and maintains this state regardless of the output of the vibration sensor 20. That is, in the case of a failure of the vibration sensor 20, priority is given to making the electronic key 1 operable to avoid deterioration in the usability of the electronic key system.

In this way, the diagnosis unit 41 and the acquisition unit 43 can detect, for example, a sensitivity failure in the vibration sensor 20, an abnormality in the second communication line 32, a processing abnormality in the detection function unit 21, and the like. Note that when the determination by the determining unit 44 is completed and the self-diagnosis is completed, the key function unit 11 ends the diagnostic mode and returns to normal.

When determining that the vibration sensor 20 is abnormal, the determination unit 44 executes a process of disconnecting the vibration sensor 20 from the microcomputer 10. This process may be, for example, a process of stopping the operation of the vibration sensor 20 via the first communication line 31, or a process of ignoring the output of the second communication line 32, that is, the interrupt signal. Processes other than these include disabling the output of the vibration sensor 20, displaying that there is an abnormality in the vibration sensor 20, disabling the switching function of the key function section 11, and the like.

The effects of this embodiment will be explained below.
(1) The abnormality detection device 40 includes a diagnostic section 41 that causes the vibration sensor 20 to perform self-diagnosis through the first communication line 31. The abnormality detection device 40 also includes an acquisition unit 43 that acquires the detection result output by the detection function unit 21 of the vibration sensor 20 during self-diagnosis through a second communication line 32 different from the first communication line 31. Furthermore, a determination unit 44 is provided that determines whether the vibration sensor 20 is normal based on the diagnosis result of the diagnosis unit 41 and the detection result acquired by the acquisition unit 43. According to this configuration, the diagnostic section 41 performs a self-diagnosis of the vibration sensor 20, and the acquisition section 43 detects an abnormality in the detection function. Thereby, an abnormality in the vibration sensor 20 can be detected with high accuracy. Therefore, operations can be performed according to the user's intention. Further, each functional unit can be realized only by software.

(2) The vibration sensor 20 outputs the detection result detected by the detection function section 21 to the acquisition section 43 as an interrupt signal. According to this configuration, it is possible to determine whether or not the interrupt function is normal.
(3) The communication on the first communication line 31 is mutual communication that allows the diagnostic unit 41 to transmit a diagnostic request to the vibration sensor 20 to instruct the vibration sensor 20 to perform a self-diagnosis, and to obtain the diagnosis result from the vibration sensor 20. be. According to this configuration, the diagnosis section 41 can control the vibration sensor 20 through mutual communication. This contributes to improving the accuracy of self-diagnosis.

(4) The diagnostic unit 41 performs self-diagnosis when no interrupt signal from the vibration sensor 20 is input for a certain period of time. According to this configuration, self-diagnosis is performed when no interrupt signal is input for a certain period of time, and it is determined whether the vibration sensor 20 is normal. Thereby, it is possible to determine whether or not there is an abnormality in the vibration sensor 20 at a suitable timing when the electronic key is not being used.

(5) The determination unit 44 determines that the vibration sensor 20 is normal when the self-diagnosis result is normal and an interrupt signal is input. According to this configuration, it is determined that the vibration sensor 20 is normal when not only the sensitivity is normal but also the second communication line 32 and the detection function section 21 are normal. This is advantageous for correctly determining whether the vibration sensor 20 is normal.

(6) The detection function unit 21 of the vibration sensor 20 outputs an interrupt signal as a comparison result when the detected acceleration value is larger than the threshold value. Furthermore, the acquisition unit 43 changes the vibration detection threshold to a threshold T2 smaller than the normal threshold T1 during self-diagnosis. According to this configuration, the vibration generated during self-diagnosis contributes to reliably outputting the interrupt signal.

Note that this embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
[About the diagnosis section 41]
- Although the condition for the diagnostic unit 41 to perform self-diagnosis is that a certain period of time has elapsed without inputting an interrupt signal, the present invention is not limited to this, and the self-diagnosis may be performed regardless of the timing of inputting an interrupt signal from the vibration sensor 20. . That is, the timing at which the diagnostic unit 41 performs self-diagnosis is not particularly limited.

- The diagnostic section 41 may perform self-diagnosis when the LF receiving section 12 is in the off state, or may perform the self diagnosis when the LF receiving section 12 is in the on state.
- The first communication line 31 used by the diagnostic unit 41 for self-diagnosis is not limited to the synchronous serial method, and any communication line may be used as long as mutual communication is possible. Alternatively, a mode may be adopted in which mutual communication is not performed, for example, a mode in which no diagnosis request is transmitted. In this case, the vibration sensor 20 may perform self-diagnosis at a predetermined timing and output the diagnosis result.

- Self-diagnosis by the diagnostic unit 41 is not limited to this embodiment. For example, the vibration sensor 20 may determine whether the acceleration value is normal. That is, at the time of self-diagnosis, the vibration sensor 20 may output an acceleration value via the first communication line 31, or may output a diagnostic result of the acceleration value.

[About the acquisition unit 43]
- When the acquisition unit 43 acquires the detection result, the function of changing the threshold T1 to the threshold T2 by the diagnosis unit 41 may be omitted. For example, the detection function unit 21 may have a threshold value T2 set in advance. Further, the threshold values T1 and T2 are not particularly limited, and are appropriately set according to specifications.

- The acquisition unit 43 may acquire acceleration value data or a binary signal as a detection result from the vibration sensor 20 during self-diagnosis. The binary signal may be a High/Low analog signal or a 1/0 digital signal. Further, the determination unit 44 may determine based on the acceleration value data, or may determine based on whether the acquisition unit 43 has acquired the detection result.

- The detection function unit 21 is not limited to outputting an interrupt signal, and may output data of acceleration values.
[others]
- When the communication function is off, LF reception may be stopped, RF transmission may be stopped, or the microcomputer itself may be turned off. Furthermore, when the communication function is off, the microcomputer 10 itself may be turned off and only the interrupt signal may be input.

- The subsequent processing may be different depending on whether the diagnosis result of the diagnosis section 41 is abnormal or when the acquisition section 43 does not acquire the interrupt signal. For example, if the diagnosis result of the diagnostic unit 41 is abnormal, the vibration sensor 20 may be stopped, and if the acquisition unit 43 does not acquire an interrupt signal, the second communication line 32 may be disabled. Furthermore, if the key function unit 11 can periodically check the acceleration value of the vibration sensor 20 through the first communication line 31, the acceleration value can be checked through the first communication line 31 after disabling the second communication line 32. The operation may also be switched by That is, based on the determination results of the diagnosis unit 41 and the acquisition unit 43, any processing may be performed as long as the operation can be performed in accordance with the user's intention.

- The key function unit 11 may be configured to return from the diagnostic mode to the normal mode when it detects an acceleration value exceeding the threshold value T1. That is, the series of self-diagnosis processes may be interrupted midway.

- Once the interrupt signal is input, the key function unit 11 temporarily disables the interrupt via the second communication line 32, and repeatedly checks the acceleration value of the vibration sensor 20 using the first communication line 31. It is also possible to check whether the movement of No. 1 continues.

- The key function section 11 may switch its operation based on various information output from the vibration sensor 20. Examples of the various information include current acceleration values, history of acceleration values, output history of interrupt signals, and combinations thereof.

- The vibration sensor 20 is not limited to a capacitance type, but may also use an eddy current type or a piezoelectric type.
- The electronic key 1 is not limited to use in a vehicle. For example, it may be an electronic key for locking and unlocking the door of a house.

- The abnormality detection device 40 is not necessarily installed in the electronic key 1, but may be installed in various electronic devices.

DESCRIPTION OF SYMBOLS 1...Electronic key, 10...Microcomputer, 11...Key function section, 12...LF receiving section, 13...RF transmitting section, 20...Vibration sensor, 21...Detection function section, 31...First communication line, 32...Second Communication line, 40... Abnormality detection device, 41... Diagnosis section, 42... Self-diagnosis section, 43... Acquisition section, 44... Judgment section.

Claims (7)

A detection value detected by the vibration sensor by causing the vibration sensor to vibrate itself is input via communication through a first communication line connected to the vibration sensor, and based on the detection value, whether the vibration sensor is normal or not. a diagnostic department that diagnoses
an acquisition unit that acquires a detection result detected by the vibration sensor with its own vibration detection function unit during diagnosis by the diagnosis unit through a second communication line different from the first communication line;
An abnormality detection device comprising: a determination unit that determines whether the vibration sensor is normal based on a diagnosis result by the diagnosis unit and the detection result acquired by the acquisition unit. The abnormality detection device according to claim 1, wherein the vibration sensor outputs the detection result detected by the detection function section during the diagnosis to the acquisition section as an interrupt signal. The communication on the first communication line is mutual communication that allows the diagnosis unit to instruct the vibration sensor to perform vibration and to obtain the detected value obtained as a result of the vibration from the vibration sensor. An abnormality detection device according to claim 1 or 2. The abnormality detection device according to any one of claims 1 to 3, wherein the diagnosis unit executes the diagnosis when the detection result from the vibration sensor is not input for a certain period of time. The determining unit determines that the vibration sensor is normal when the diagnosis result is normal and the detection result is input from the vibration sensor through the second communication line. The abnormality detection device according to any one of the items. The detection function unit outputs a comparison result with respect to a threshold value as the detection result of vibration,
The abnormality detection device according to any one of claims 1 to 5, wherein the diagnostic unit sets the threshold value lower than a normal value during the diagnosis . a key function unit that performs ID verification through wireless communication with a communication partner;
A detection value detected by the vibration sensor by causing the vibration sensor to vibrate itself is input via communication through a first communication line connected to the vibration sensor, and based on the detection value, whether the vibration sensor is normal or not. a diagnostic department that diagnoses
an acquisition unit that acquires a detection result detected by the vibration sensor with its own vibration detection function unit during diagnosis by the diagnosis unit through a second communication line different from the first communication line;
An electronic key comprising: a determination unit that determines whether the vibration sensor is normal based on a diagnosis result by the diagnosis unit and the detection result acquired by the acquisition unit.