Vehicle diagnostic system

Abstract

The present application relates to a vehicle diagnosis system. The vehicle diagnosis system has a diagnosis section for diagnosing an abnormality of a component that separates the inside of a vehicle cabin from the outside, a notifier and a siren located outside the vehicle cabin, and a microphone located inside the vehicle cabin. The diagnosis section performs a process of acquiring detection sound data related to a sound detected by the microphone when the notifier or the siren emits a sound, and a process of comparing the detection sound data with reference sound data determined in advance to determine whether the component has an abnormality.

Description

Technical Field

[0001] This invention relates to a vehicle diagnostic system. Background Technology

[0002] The vehicle control device disclosed in Japanese Patent No. 4706890 can perform diagnostic processing to diagnose vehicle faults when a user perceives a certain abnormality in the vehicle. The control device performs diagnostic processing according to the user's instructions. During diagnostic processing, the control device identifies the location of the fault or prompts the vehicle to be taken to a dealership. Summary of the Invention

[0003] Depending on the nature of the fault, sometimes users may not be able to perceive any changes in the vehicle. In Japanese Patent No. 4706890, the control device will not perform diagnostic processing unless the user perceives any abnormality and instructs the control device to do so. Therefore, even if a fault occurs that the user cannot perceive, it is impossible to perform diagnostic processing and thus understand the fault.

[0004] A vehicle diagnostic system for addressing the aforementioned issues includes: a diagnostic device for diagnosing abnormalities in components that separate the interior and exterior of a vehicle compartment; a sound source located outside the compartment that emits a sound with at least one of sound pressure and frequency predetermined; and a microphone located inside the compartment. The diagnostic device performs: an acquisition process that, when the sound source emits a sound, acquires detection sound data related to the sound detected by the microphone; and a determination process that compares the detection sound data with predetermined reference sound data to determine whether the component is abnormal.

[0005] According to the above structure, the diagnostic device determines whether there is any abnormality in the component separating the interior and exterior of the vehicle compartment by comparing the detected sound data based on the sound detected by the microphone with reference sound data. Furthermore, since the diagnostic device acquires the detected sound data when the sound source installed in the vehicle emits sound, it can acquire the detected sound data even if the user does not perceive any abnormality in the component. In other words, in the above structure, it is possible to determine whether a component is abnormal regardless of whether the user perceives any abnormality.

[0006] In a vehicle diagnostic system, the sound pressure of the sound emitted by the sound source can also be predetermined. In the determination process, the diagnostic device determines whether the component is abnormal based on the difference between the sound pressure of the detected sound data and the sound pressure of the reference sound data.

[0007] If the component separating the interior and exterior of the carriage malfunctions, sound from a sound source may easily reach the interior of the carriage. In this case, the sound pressure level detected by the microphone is likely to increase. Based on the above structure, by utilizing this characteristic, it is possible to properly determine the malfunction of the component separating the interior and exterior of the carriage.

[0008] In a vehicle diagnostic system, the frequency of the sound emitted by the sound source is predetermined. When the decay rate of the sound pressure after the sound source finishes emitting sound is taken as the sound pressure decay rate, in the determination process, the diagnostic device determines whether the component is abnormal based on the difference between the sound pressure decay rate of the detected sound data and the sound pressure decay rate of the reference sound data.

[0009] If the component separating the interior and exterior of the carriage malfunctions, sound traveling from the outside to the inside may not attenuate properly within the carriage. In this case, the microphone is likely to detect a slower rate of sound attenuation. Based on the above structure, by utilizing this characteristic, it is possible to accurately determine the malfunction of the component separating the interior and exterior of the carriage.

[0010] In a vehicle diagnostic system, the sound source may emit a sound to notify the surroundings of the vehicle's presence. In the determination process, during the vehicle's operation, the diagnostic device compares the detection sound data associated with the sound emitted by the sound source with the reference sound data of the sound to determine whether the component is abnormal.

[0011] With the structure described above, if a sound source that emits a sound to notify the surroundings of the vehicle's presence is used, it is unnecessary to add an additional sound source to the vehicle solely for diagnostic purposes. Furthermore, the sound emitted by this sound source while the vehicle is in motion is emitted regardless of whether the user perceives any abnormality in the component. Therefore, it is possible to determine whether a component is malfunctioning, regardless of whether the user perceives any abnormality.

[0012] In a vehicle diagnostic system, the sound source may emit the sound when the vehicle is parked within a predetermined area. During the determination process, the diagnostic device compares the detection sound data associated with the sound emitted by the sound source when the vehicle is parked with the reference sound data of the sound to determine if the component is malfunctioning. With this structure, emitting the sound from the sound source when the vehicle is parked within a predetermined area increases the likelihood of performing the determination process.

[0013] In a vehicle diagnostic system, the diagnostic device can also be mounted on the vehicle. In this configuration, diagnostics can be performed on components separated from the interior and exterior of the vehicle compartment. Therefore, compared to having the diagnostic device located outside the vehicle, the system structure can be simplified.

[0014] Alternatively, the vehicle diagnostic system may include an external device capable of wireless communication with the vehicle. The diagnostic device is located on the external device, and the reference tone data is stored for each of the multiple vehicle models. In the acquisition process, the diagnostic device acquires the detection tone data and the vehicle model information of the vehicle being diagnosed as the target vehicle for diagnosing the component's anomaly. In the determination process, the diagnostic device compares the detection tone data acquired in the acquisition process with the reference tone data corresponding to the vehicle model of the target vehicle.

[0015] Based on the above structure, multiple vehicles can share an external device equipped with a diagnostic tool, thus simplifying the management of the diagnostic tool. Furthermore, by using reference sound data corresponding to the vehicle model being diagnosed to determine the presence or absence of abnormalities, high accuracy in anomaly detection can be ensured.

[0016] In a vehicle diagnostic system, the component can also be one that separates the engine compartment or motor compartment from the passenger compartment. Based on this structure, it is possible to determine whether the component separating the engine compartment or motor compartment from the passenger compartment is abnormal. Attached Figure Description

[0017] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals show the same elements, and wherein:

[0018] Figure 1 This is a schematic diagram of the vehicle sharing system.

[0019] Figure 2 It is a schematic diagram of the vehicle's structure.

[0020] Figure 3 This is a flowchart illustrating the processing steps involved in the diagnostic procedure.

[0021] Figure 4 It is a schematic diagram of the management server and vehicles.

[0022] Figure 5 This is a flowchart illustrating the processing steps for diagnostic assistance and server-side diagnostic processing. Detailed Implementation

[0023] <First Implementation>

[0024] The following refers to the attached diagram. Figures 1-3 The first embodiment of the vehicle diagnostic system is described.

[0025] The following example illustrates a vehicle diagnostic system, using a vehicle in a shared utilization system that allows the vehicle to drive autonomously without driver intervention and is shared by multiple unspecified users as the diagnostic target.

[0026] <Outline Structure of a Shared Utilization System>

[0027] like Figure 1 As shown, the vehicle sharing system 10 has a management server 20, multiple vehicles 30, and a user terminal 14.

[0028] User terminal 14 is a terminal used by a user of vehicle 30. User terminal 14 is, for example, a smartphone. User terminal 14 can send and receive information with management server 20 via external communication network 12. In response to input from the user, user terminal 14 sends a usage request to management server 20. The usage request information includes, for example, the usage start location, destination, and usage start date and time of vehicle 30. The usage start location is the location where the user requests delivery of vehicle 30. The usage start date and time are the date and time the user requests delivery of vehicle 30.

[0029] The management server 20 is a server that manages multiple vehicles 30. The management server 20 can be configured as one or more processors that execute various processes according to computer programs (software). It should be noted that the management server 20 can also be configured as one or more dedicated hardware circuits, or combinations thereof, including application-specific integrated circuits (ASICs), that execute at least a portion of the various processes. The processor includes a CPU and memories such as RAM and ROM. The memories store program code or instructions configured to cause the CPU to execute processes. Memory, i.e., computer-readable media, includes all available media that can be accessed by a general-purpose or special-purpose computer. The management server 20 has a storage device as electrically rewritable non-volatile memory. The management server 20 has a communication device for connecting to the outside via an external communication network 12. It should be noted that the management server 20 constitutes a processing device, i.e., an external device, located outside the vehicles 30.

[0030] Management server 20 stores individual identification information for each vehicle 30 to enable individual identification of multiple vehicles 30. Individual identification information includes, for example, vehicle model, chassis number, and vehicle registration license plate information. Management server 20 sends various types of information to each vehicle 30 wirelessly via external communication network 12. For example, management server 20 sends information to each vehicle 30 regarding its intended destination. The destination is either the user-requested start point of use or a vehicle base. A vehicle base is a parking lot used to accommodate multiple vehicles 30 when the user is not using the vehicles.

[0031] <General Structure of the Vehicle>

[0032] Multiple vehicles 30 are electric vehicles. Although the multiple vehicles 30 have different models, their basic structure is the same. The basic structure of each vehicle 30 is described below.

[0033] like Figure 2 As shown, the vehicle 30 has a motor compartment 32, a front bulkhead 35, and a cargo box 31. The motor compartment 32 is a space divided into the front portion of the vehicle 30. The front bulkhead 35 is a wall that divides the rear end of the motor compartment 32. The front bulkhead 35 is plate-shaped. The cargo box 31 is a space divided on the opposite side of the motor compartment 32, separated by the front bulkhead 35. That is, the front bulkhead 35 separates the motor compartment 32 from the cargo box 31. It should be noted that, although not shown in the figure, the front bulkhead 35 is configured to include a plate-shaped front bulkhead body and sound insulation material installed on the front bulkhead body. Multiple mounting members penetrate the front bulkhead body and the sound insulation material. The multiple mounting members fix the front bulkhead body and the sound insulation material together.

[0034] Vehicle 30 includes an electric generator 37, a battery 38, and drive wheels 39. The electric generator 37 is the drive source for vehicle 30. The electric generator 37 is a generator-electric motor that functions as both an electric motor and a generator. The electric generator 37 is electrically connected to the battery 38 via an inverter. The battery 38 supplies power to the electric generator 37 or stores the power supplied by the electric generator 37. The inverter performs DC-AC power conversion. It should be noted that... Figure 2 The inverter diagram is omitted.

[0035] The electric generator 37 is located inside the motor compartment 32. The rotating shaft of the electric generator 37 is connected to the drive wheel 39 via a power transmission mechanism such as a torque converter, gearbox, clutch, and differential. It should be noted that... Figure 2 The diagram of the power transmission mechanism is omitted.

[0036] Vehicle 30 has multiple seats 40 and multiple pressure sensors 41. Each seat 40 is a seat for occupants. Each seat 40 is located inside the vehicle compartment 31. Each pressure sensor 41 is installed in each seat 40. Each pressure sensor 41 detects the pressure applied to the seating surface of each seat 40, i.e., the seat pressure W. It should be noted that... Figure 2 Only one of the multiple seats 40 is shown in the image. Additionally, in... Figure 2 Only one of the multiple pressure sensors 41 is shown in the image.

[0037] Vehicle 30 includes a notification device 33, a siren 34, and a microphone 36. The notification device 33 is a sound source that emits a sound with a predetermined sound pressure level and frequency. When vehicle 30 is traveling at low speed, the notification device 33 emits a notification sound to inform the surroundings of the vehicle's presence. The notification sound emitted by the notification device 33 is, for example, the sound of an analog motor, and is set to be relatively quiet and not constitute noise. The notification device 33 is located inside the motor compartment 32. The siren 34 is a sound source that emits a sound with a predetermined sound pressure level and frequency. The siren 34 emits a siren to inform the surroundings of the vehicle's presence while vehicle 30 is moving or stationary. The siren emitted by the siren 34 is set to be louder than the notification sound. The siren 34 is located inside the motor compartment 32. The microphone 36 detects and converts the sound pressure of a predetermined frequency band into a sound pressure level L in decibels. The microphone 36 is located inside the passenger compartment 31. It should be noted that the notification tone emitted by the notifier 33 is set to a predetermined sound pressure level L. The siren emitted by the alarm 34 is set to a predetermined sound pressure level L different from the notification tone.

[0038] Vehicle 30 features turn signals, hazard warning lights, windshield wipers, air conditioning, and powered windows. Turn signals are directional indicators. Hazard warning lights are flashing lights used to illuminate in emergencies. Windshield wipers are used to remove raindrops, dirt, and dust from the windshield and rear window. Air conditioning is an air conditioning system. Powered windows are electrically operated window opening and closing mechanisms. It should be noted that... Figure 2 In this diagram, these various devices are grouped together into one, denoted by the reference numeral M.

[0039] Vehicle 30 includes a speed sensor 42, a GPS receiver 43, a camera 44, and a radar 45. The speed sensor 42 detects the vehicle 30's speed, SP. The GPS receiver 43 receives signals from GPS satellites related to the vehicle 30's current position coordinates G. The camera 44 captures images of the vehicle 30's surroundings. The radar 45 detects obstacles Z by transmitting and receiving radio waves reflected from them.

[0040] <Brief Structure of Vehicle Control System>

[0041] Vehicle 30 has a control device 50. The control device 50 can be configured as one or more processors that execute various processes according to a computer program (software). It should be noted that the control device 50 can also be configured as one or more dedicated hardware circuits, including application-specific integrated circuits (ASICs) or combinations thereof, that execute at least a portion of the various processes. The processor includes a CPU and memories such as RAM and ROM. The memories store program code or instructions configured to cause the CPU to execute processes. Memory, i.e., computer-readable media, includes all available media accessible by a general-purpose or special-purpose computer. The control device 50 has electrically rewritable non-volatile memory, i.e., a storage device. The control device 50 has a communication device for communicating with the outside of vehicle 30 via an external communication network 12. It should be noted that the control device 50 stores individual identification information related to the vehicle 30 equipped with the control device 50. The content of the individual identification information is the same as that stored in the management server 20.

[0042] The control device 50 switches between an on state and a standby state. The on state is when the main system, which powers various parts of the vehicle 30, is activated. When the main system is activated via the control device 50, power is supplied to various parts of the vehicle 30, such as the electric generator 37 and various devices M. On the other hand, the standby state is when the main system is powered off, and the device is receiving an activation instruction from the main system. In the standby state, the power supply to various parts of the vehicle 30 is cut off. In the standby state, the power supply to the control device 50 from external sources is also cut off, but the control device 50 can operate using power from its built-in battery. The control device 50 switches between the standby state and the on state according to instructions from the management server 20.

[0043] Control device 50 receives the vehicle speed SP detected by vehicle speed sensor 42. Control device 50 receives a signal related to the current position coordinates G received by GPS receiver 43. Control device 50 receives a signal related to the information captured by camera 44, i.e., video information J. Control device 50 receives a signal related to obstacles Z detected by radar 45. Control device 50 receives a signal related to the seat pressure W detected by pressure sensor 41. Control device 50 receives a signal related to the sound pressure level L detected by microphone 36.

[0044] The control unit 50 includes an integrated control unit 52 that controls various parts of the vehicle 30. During main system operation, the integrated control unit 52 controls various parts of the vehicle 30 for autonomous driving. Autonomous driving refers to the vehicle 30 driving itself without driver intervention. For example, the integrated control unit 52 drives the vehicle 30 while maintaining lane position and distance from the vehicle ahead, based on camera information J from camera 44. Additionally, the integrated control unit 52 drives the vehicle 30 while avoiding obstacles Z, for example, based on information about obstacles Z detected by radar 45. Furthermore, the integrated control unit 52 calculates the driving path that the vehicle 30 should take towards its destination. The integrated control unit 52 stores map data as required for calculating the driving path of the vehicle 30. The map data includes, for example, information such as roads and buildings. Based on the current position coordinates G of the vehicle 30 received from GPS receiver 43 and the map data, the integrated control unit 52 calculates the driving path to the destination and drives the vehicle 30 along the path. It should be noted that the destination is sent from the management server 20. The destination can also be indicated by the user via a display screen (not shown) inside carriage 31.

[0045] When the vehicle speed SP of vehicle 30 is less than the prescribed speed, the integrated control unit 52 controls the notification device 33 to emit a notification sound. The prescribed speed is predetermined to be the speed at which the vehicle's presence needs to be announced to pedestrians, for example, when the road noise caused by tires is relatively low. The prescribed speed is, for example, 20 km / h. The integrated control unit 52 sets a flag indicating whether a notification sound has been emitted from the notification device 33, namely, a notification sound emission flag. When a notification sound has been emitted from the notification device 33, the integrated control unit 52 sets the notification sound emission flag to "ON". On the other hand, when no notification sound has been emitted from the notification device 33, the integrated control unit 52 sets the notification sound emission flag to "OFF".

[0046] The integrated control unit 52 activates the turn signals, hazard warning lights, windshield wipers, air conditioning, and power windows as needed. For example, when turning left or right or changing lanes while the vehicle 30 is in motion, the integrated control unit 52 activates the turn signals. The integrated control unit 52 sets a flag indicating the operating status of the turn signals, i.e., an operating flag. When the turn signals are activated, the integrated control unit 52 sets the operating flag of the turn signals to "ON". On the other hand, when the turn signals are not activated, the integrated control unit 52 sets the operating flag of the turn signals to "OFF". For other devices M besides the turn signals, the integrated control unit 52 also sets an operating flag indicating the operating status of each device M. It should be noted that the operating flag related to the power windows is not only "ON" or "OFF", but can also identify three states: the window is in the process of opening and closing, the window is closed, and the window is open.

[0047] The control device 50 includes a diagnostic unit 54 for diagnosing abnormalities in various parts of the vehicle 30. The diagnostic unit 54 constitutes a diagnostic device. The diagnostic unit 54 is capable of performing diagnostic processing for diagnosing abnormalities in the front bulkhead 35. As part of the diagnostic processing, the diagnostic unit 54 performs acquisition processing and determination processing. The diagnostic unit 54 performs acquisition processing and determination processing while the vehicle 30 is in motion and when it is stationary, respectively.

[0048] In the acquisition processing while the vehicle 30 is in motion, when the notification device 33 emits a notification tone, the diagnostic unit 54 acquires data related to the sound pressure level L detected by the microphone 36 at the moment the notification tone is emitted, namely, notification tone detection data. In the determination processing while the vehicle 30 is in motion, the diagnostic unit 54 determines whether the front bulkhead 35 is abnormal by comparing the notification tone detection data with the notification tone reference data. Specifically, if the difference between the sound pressure level L of the notification tone detection data and the notification tone reference data is greater than or equal to the notification tone specified value, the diagnostic unit 54 determines that the front bulkhead 35 is abnormal. The diagnostic unit 54 pre-stores the notification tone reference data and the notification tone specified value. The notification tone reference data and the notification tone specified value will be described later.

[0049] In the acquisition process while the vehicle is parked, when the siren 34 sounds, the diagnostic unit 54 acquires data related to the sound pressure level L detected by the microphone 36 at the moment the siren is sounded, i.e., siren detection data. In the determination process while the vehicle is parked, the diagnostic unit 54 determines whether the front bulkhead 35 is abnormal by comparing the siren detection data with siren reference data. Specifically, if the difference between the sound pressure level L of the siren detection data and the siren reference data is greater than or equal to a siren-specified value, the diagnostic unit 54 determines that the front bulkhead 35 is abnormal. The diagnostic unit 54 pre-stores the siren reference data and the siren-specified value. The siren reference data and the siren-specified value will be described later. It should be noted that the diagnostic unit 54 performs the acquisition and determination processes while the vehicle is parked at a vehicle base. The vehicle base is preferably an area where sounding the siren will not cause noise to the surrounding area.

[0050] <Details of the diagnosis and treatment>

[0051] During the startup phase of the main system, the diagnostic unit 54 repeatedly executes diagnostic processing. It should be noted that the diagnostic unit 54 utilizes a shutdown execution flag in a portion of the processing performed through the diagnostic process. The shutdown execution flag indicates that the judgment processing during shutdown has been completed. When the main system is powered off, the shutdown execution flag is reset to "OFF". Therefore, at the moment the main system starts up, the shutdown execution flag is "OFF".

[0052] When the main system starts up, the diagnostic unit 54 begins diagnostic processing. For example... Figure 3 As shown, when the diagnostic process begins, the diagnostic unit 54 executes step S110. In step S110, the diagnostic unit 54 determines whether the diagnostic prerequisites are met. The diagnostic prerequisites include the following three items.

[0053] (a) All devices M are not working.

[0054] (b) The window is closed.

[0055] (c) The passenger was not in the vehicle.

[0056] The diagnostic unit 54 determines whether items (a) and (b) are met based on the operating flags of various devices M. Additionally, when determining whether item (c) is met, the diagnostic unit 54 obtains the latest value of the seat pressure W received by the control device 50 from the pressure sensor 41. The diagnostic unit 54 compares the obtained seat pressure W with a specified pressure. The diagnostic unit 54 stores the specified pressure in advance. The specified pressure is, for example, determined experimentally as the minimum pressure applied to the seat 40 when the occupant sits on it. The diagnostic unit 54 determines that the occupant is seated if the seat pressure W is above the specified pressure, and determines that the occupant is not seated if the seat pressure W is not above the specified pressure. If even one of the three diagnostic prerequisites is not met, the diagnostic unit 54 determines that the diagnostic prerequisite is not met (step S110: No). In this case, the diagnostic unit 54 temporarily terminates the series of diagnostic processes. Then, the diagnostic unit 54 executes step S110 again.

[0057] On the other hand, in step S110, if all three items mentioned above are satisfied, the diagnostic unit 54 determines that the diagnostic prerequisites are met (step S110: Yes). In this case, the diagnostic unit 54 causes the process to proceed to step S120.

[0058] In step S120, the diagnostic unit 54 determines whether the vehicle 30 is in motion. During the processing of step S120, the diagnostic unit 54 obtains the latest value of the vehicle speed SP received by the control device 50 from the vehicle speed sensor 42. Then, the diagnostic unit 54 determines whether the vehicle speed SP is greater than zero. If the vehicle speed SP is zero, the diagnostic unit 54 determines that the vehicle 30 is stationary (step S120: No). In this case, the diagnostic unit 54 proceeds to step S210.

[0059] In step S210, the diagnostic unit 54 determines whether the vehicle 30 is located within the vehicle base. During the execution of step S210, the diagnostic unit 54 obtains the latest value of the current position coordinates G received by the control device 50 from the GPS receiver 43. Then, the diagnostic unit 54 determines whether the current position coordinates G of the vehicle 30 are within the area of ​​the vehicle base in the map data. If the current position coordinates G of the vehicle 30 deviate from the area of ​​the vehicle base, the diagnostic unit 54 determines that the vehicle 30 is not located within the vehicle base (step S210: No). In this case, the diagnostic unit 54 temporarily terminates the series of diagnostic processes. Then, the diagnostic unit 54 executes the process of step S110 again.

[0060] On the other hand, in step S210, if the diagnostic unit 54 determines that the vehicle 30 is located in the vehicle base if the current position coordinates G of the vehicle 30 are within the area of ​​the vehicle base (step S210: Yes). In this case, the diagnostic unit 54 causes the process to proceed to step S220.

[0061] In step S220, the diagnostic unit 54 determines whether the parking determination process has not been executed. The diagnostic unit 54 makes this determination based on the parking execution flag. If the parking execution flag is "ON", the diagnostic unit 54 determines that the parking determination process has been completed (step S220: No). In this case, the series of diagnostic processes is temporarily terminated. Then, the diagnostic unit 54 executes the process of step S110 again.

[0062] On the other hand, in step S220, if the execution flag is "OFF" when the vehicle is parked, the diagnostic unit 54 determines that the parking determination process has not been executed (step S220: Yes). In this case, the diagnostic unit 54 causes the process to proceed to step S230.

[0063] In step S230, the diagnostic unit 54 switches the parking execution flag to "ON". As described above, the parking execution flag is reset to "OFF" when the main system is powered off. When the diagnostic unit 54 sets the parking execution flag to "ON", the process proceeds to step S240.

[0064] In step S240, the diagnostic unit 54 begins to output a siren request signal to the integrated control unit 52. This siren request signal requests the siren 34 to emit its siren. Then, the diagnostic unit 54 causes the process to proceed to step S250. It should be noted that when the integrated control unit 52 receives the siren request signal, it controls the siren 34 to emit its siren.

[0065] In step S250, the diagnostic unit 54 acquires siren detection data. Specifically, the diagnostic unit 54 acquires the latest value of the sound pressure level L received by the control device 50 from the microphone 36. Then, the diagnostic unit 54 processes the acquired sound pressure level L as siren detection data. Upon acquiring the siren detection data, the diagnostic unit 54 proceeds to step S260. It should be noted that the processing in step S250 is an acquisition process.

[0066] In step S260, the diagnostic unit 54 stops outputting the siren request signal. Then, the diagnostic unit 54 causes the process to proceed to step S270. It should be noted that when the integrated control unit 52 stops outputting the siren request signal, it controls the siren 34 to stop emitting the siren.

[0067] In step S270, the diagnostic unit 54 uses siren detection data to determine whether there is an abnormality in the front bulkhead 35. When determining whether there is an abnormality in the front bulkhead 35, the diagnostic unit 54 first calculates a siren difference value obtained by subtracting siren reference data from the siren detection data. As described above, the diagnostic unit 54 stores siren reference data in advance. The siren reference data is the sound pressure level L detected by the microphone 36 when the siren 34 sounds under the premise that the diagnostic preconditions are met and the front bulkhead 35 is not abnormal. The siren reference data can be calculated as follows: When the vehicle 30 being diagnosed is in a new condition, the following experiment is repeatedly performed multiple times. The experiment involves sounding the siren 34 under the condition that the diagnostic preconditions are met, and obtaining the sound pressure level L detected by the microphone 36 at that time. The average value of multiple sound pressure levels L obtained by repeating this experiment multiple times is used as the siren reference data.

[0068] When calculating the siren difference value, the diagnostic unit 54 compares the siren difference value with the siren specified value. As mentioned above, the diagnostic unit 54 pre-stores the siren specified value. The siren specified value is determined, for example, through experimentation, to be a value that indicates a difference in sound pressure level L between the siren detection data and the siren reference data that would not occur when the front panel 35 is functioning normally. For example, the siren specified value can be determined by considering the detection error of the microphone 36.

[0069] If the siren difference value is less than the specified siren value, the diagnostic unit 54 determines that the front bulkhead 35 is not abnormal (step S270: No). In this case, the diagnostic unit 54 temporarily terminates the series of diagnostic processes. Then, the diagnostic unit 54 executes the process of step S110 again.

[0070] On the other hand, in step S270, if the siren differential value is above the siren's predetermined value, the diagnostic unit 54 determines that an abnormality has occurred in the front bulkhead 35 (step S270: Yes). In this case, the diagnostic unit 54 causes the process to proceed to step S300. It should be noted that the process in step S270 is a determination process.

[0071] In step S300, the diagnostic unit 54 generates abnormal information, which includes information indicating an abnormal event in the front bulkhead 35 and the vehicle's individual identification information. Then, the diagnostic unit 54 sends the abnormal information to the management server 20. Afterwards, the diagnostic unit 54 temporarily terminates the diagnostic process and executes step S110 again. It should be noted that when the management server 20 receives the abnormal information, it determines the corresponding vehicle 30 based on the individual identification information contained in the abnormal information and stores the meaning that the corresponding vehicle 30 is determined to have an abnormality in the front bulkhead 35. The administrator of the management server 20 reads the information stored in the management server 20 to monitor the status of the vehicle 30.

[0072] Additionally, in step S120, if the vehicle speed SP is greater than zero, the diagnostic unit 54 determines that the vehicle 30 is in motion (step S120: Yes). In this case, the diagnostic unit 54 causes the process to proceed to step S130.

[0073] In step S130, the diagnostic unit 54 determines whether the notifier 33 is emitting a notification tone. The diagnostic unit 54 makes this determination based on a notification tone emission flag. If the notification tone emission flag is "OFF", the diagnostic unit 54 determines that the notifier 33 is not emitting a notification tone (step S130: No). In this case, the diagnostic unit 54 temporarily terminates the series of diagnostic processes. Then, the diagnostic unit 54 performs the process in step S110 again.

[0074] On the other hand, in step S130, if the notification tone emission flag is "ON", the diagnostic unit 54 determines that the notification device 33 is emitting a notification tone (step S130: Yes). In this case, the diagnostic unit 54 causes the process to proceed to step S140.

[0075] In step S140, the diagnostic unit 54 acquires notification tone detection data. Specifically, the diagnostic unit 54 acquires the latest value of the sound pressure level L received by the control device 50 from the microphone 36. Then, the diagnostic unit 54 processes the acquired sound pressure level L as notification tone detection data. After acquiring the notification tone detection data, the diagnostic unit 54 proceeds to step S150. It should be noted that the processing in step S140 is an acquisition process.

[0076] In step S150, the diagnostic unit 54 uses the notification sound detection data to determine whether there is an abnormality in the front bulkhead 35. When determining whether there is an abnormality in the front bulkhead 35, the diagnostic unit 54 first calculates the notification sound difference value obtained by subtracting the notification sound reference data from the notification sound detection data. As described above, the diagnostic unit 54 pre-stores the notification sound reference data. The notification sound reference data is the sound pressure level L detected by the microphone 36 when the notifier 33 emits a notification sound, assuming that the front bulkhead 35 is not abnormal, under the premise of meeting the diagnostic preconditions. The notification sound reference data can be set to a value calculated by applying the same method as the siren reference data to the notification sound.

[0077] After calculating the notification tone difference value, the diagnostic unit 54 compares the notification tone difference value with the notification tone standard value. As mentioned above, the diagnostic unit 54 pre-stores the notification tone standard value. The notification tone standard value is determined from the same perspective as the siren standard value.

[0078] If the difference in the notification tone is less than the specified value, the diagnostic unit 54 determines that the front bulkhead 35 is not abnormal (step S150: No). In this case, the diagnostic unit 54 temporarily terminates the series of diagnostic processes. Then, the diagnostic unit 54 executes the process of step S110 again.

[0079] On the other hand, in step S150, if the difference in the notification tone is above the specified value, the diagnostic unit 54 determines that the front bulkhead 35 has malfunctioned (step S150: Yes). In this case, the diagnostic unit 54 proceeds to step S300. The process of step S300 is as described above. It should be noted that the process of step S150 is a determination process.

[0080] <Function of the first embodiment>

[0081] The sound insulation material of the front bulkhead 35 sometimes deteriorates and cracks. In this case, the sound emitted by the announcer 33 or siren 34 inside the motor compartment 32 can easily reach the interior of the passenger compartment 31. Additionally, the mounting piece that integrates the front bulkhead body with the sound insulation material sometimes detaches. In this case, the through hole for mounting the mounting piece is open in the front bulkhead body and the sound insulation material. The sound emitted by the announcer 33 or siren 34 inside the motor compartment 32 can easily reach the interior of the passenger compartment 31 through this through hole. Due to this causal relationship, the abnormality of the front bulkhead 35 can be diagnosed by analyzing the sound pressure level L detected by the microphone 36 inside the passenger compartment 31 when the announcer 33 or siren 34 sounds inside the motor compartment 32.

[0082] When diagnosing abnormalities in the front bulkhead 35 using the sounds emitted by the internal notification device 33 or siren 34 in the motor compartment 32, the accuracy of the diagnosis decreases if the microphone 36 detects a sound pressure level L different from the notification tone or siren when these notification devices 33 or siren 34 emit sounds. Examples of the different sounds that the microphone 36 can detect include the operating sounds of various devices M, noises outside the passenger compartment 31 when the windows are open, and sounds made by passengers when they are seated. Therefore, diagnostic preconditions are set when acquiring notification tone detection data or siren detection data during the diagnostic process.

[0083] Furthermore, during the diagnostic process, the diagnostic unit 54 acquires notification tone detection data when the notification device 33 emits a notification tone during the operation of the vehicle 30, provided that the diagnostic preconditions are met. Additionally, the diagnostic unit 54 acquires siren detection data when the siren 34 emits a siren while the vehicle 30 is parked at a vehicle base, provided that the diagnostic preconditions are met. Then, the diagnostic unit 54 uses this notification tone detection data and siren detection data to determine whether there is any abnormality in the front bulkhead 35.

[0084] <Effects of the first implementation method>

[0085] (1-1) The front bulkhead 35 is positioned in a location where it is difficult for occupants to see its appearance, and it is not a component that performs any actions or makes any sounds. Therefore, even if an anomaly occurs, such as deterioration of the sound insulation material, the user is unlikely to notice it. Furthermore, in the shared utilization system 10, there is a high probability that the user will use a different vehicle 30 each time. Therefore, it is even more difficult for the user to notice an anomaly related to the front bulkhead 35 of a specific vehicle 30.

[0086] In this embodiment, when the notification device 33 or the siren 34 emits an sound, the diagnostic unit 54 acquires the sound pressure level L detected by the microphone 36 at the moment the sound is emitted as notification sound detection data or siren detection data. Therefore, even if the user does not perceive any abnormality in the front bulkhead 35, the diagnostic unit 54 can acquire the data required for diagnosing the front bulkhead 35. Then, when the diagnostic unit 54 acquires this data, it uses it to determine whether there is any abnormality in the front bulkhead 35. Thus, regardless of whether the user perceives any abnormality in the front bulkhead 35, the diagnostic unit 54 can diagnose any abnormality in the front bulkhead 35.

[0087] (1-2) As described above, if the front bulkhead 35 malfunctions, the sound emitted by the announcer 33 or the siren 34 inside the motor compartment 32 is more likely to reach the interior of the passenger compartment 31. In this case, the sound pressure level L detected by the microphone 36 is likely to increase. Therefore, as in this embodiment, by determining whether the announcement tone detection data is higher than the announcement tone reference data, or whether the siren detection data is higher than the siren reference data, it is possible to properly determine whether the front bulkhead 35 is malfunctioning.

[0088] (1-3) As described above, in this embodiment, alarm sound detection data or siren detection data are acquired only when the diagnostic prerequisites are met. Therefore, data on sounds other than those required for diagnosing anomalies in the front bulkhead 35 can be acquired. By utilizing such data, high diagnostic accuracy can be ensured.

[0089] (1-4) In this embodiment, the notification tone emitted by the notification device 33 is used to diagnose abnormalities in the front bulkhead 35. The notification device 33 is a conventional device commonly installed in electric vehicles. By utilizing the sound emitted by such a conventional device, it is not necessary to add an additional sound source to the vehicle 30 solely for diagnostic purposes. Furthermore, the notification tone of the notification device 33 is emitted regardless of whether the user perceives any abnormality. Therefore, even without any user intervention, notification tone detection data can be obtained to diagnose abnormalities in the front bulkhead 35.

[0090] (1-5) In this embodiment, the siren emitted by the siren 34 is used to diagnose abnormalities in the front bulkhead 35. The siren 34 is a conventional device commonly installed in automobiles. Using the sound emitted by such a conventional device eliminates the need to add a sound source to the vehicle 30 solely for diagnostic purposes. However, the opportunity to sound the siren while the vehicle 30 is in motion is limited. Therefore, in this embodiment, the siren is sounded at a specific location, such as a vehicle depot, to obtain siren detection data. This increases the diagnostic opportunities for the front bulkhead 35 without unintentionally emitting the siren. Furthermore, the siren 34 is activated not through user operation, but through the control of the diagnostic unit 54; therefore, even without any user intervention, siren detection data can be obtained to diagnose abnormalities in the front bulkhead 35.

[0091] (1-6) In this embodiment, the acquisition and determination processes are performed by the control device 50 of the vehicle 30. Therefore, there is no need to provide a separate diagnostic processing device for the front bulkhead 35. Furthermore, there is no need to send or receive diagnostic information between such a processing device and the vehicle 30. Consequently, there is no burden of processing corresponding to the sending and receiving of such information.

[0092] <Second Implementation Method>

[0093] The following is for reference Figure 4 and Figure 5 A second embodiment of the vehicle diagnostic system will be described. In this second embodiment, only the structure of the control device 50 for managing the server 20 and the vehicle 30 differs from that of the first embodiment. The following description will focus primarily on these differences from the first embodiment; content that overlaps with the first embodiment will be simplified or omitted. It should be noted that... Figure 4 In, only those shown in Figure 1 The shared utilization system 10 described herein includes a management server 20 and a vehicle 30. Additionally, in Figure 4 Regarding vehicle 30, only those vehicles are shown in the text. Figure 2 Some of the components are shown in the diagram; other components are omitted from the diagram.

[0094] like Figure 4As shown, the management server 20 has a server diagnostic unit 22 for diagnosing anomalies in the front bulkhead 35. The server diagnostic unit 22 constitutes a diagnostic device. The server diagnostic unit 22 is capable of performing server-side diagnostic processing for diagnosing anomalies in the front bulkhead 35. The server diagnostic unit 22 performs acquisition processing and determination processing. In the acquisition processing, the server diagnostic unit 22 acquires detection sound data from the vehicle 30, which is the target vehicle for diagnosing the front bulkhead 35. In addition, in the acquisition processing, the server diagnostic unit 22 acquires the vehicle model information of the target vehicle from the vehicle model. In the determination processing, the server diagnostic unit 22, similarly to the above embodiment, determines whether there is an anomaly in the front bulkhead 35 by comparing the detection sound data with reference sound data. It should be noted that the server diagnostic unit 22 stores the notification sound reference data for each vehicle model. Each notification sound reference data is calculated for each vehicle model using the method described in the first embodiment above. In addition, the server diagnostic unit 22 stores the notification sound specified value for each vehicle model. The notification sound specified value is, for example, a value determined from the same perspective as the above embodiment, taking into account the type of microphone 36 for each vehicle model.

[0095] The control unit 50 of vehicle 30 does not have the diagnostic unit described in the first embodiment, but has a diagnostic assistance unit 56. The diagnostic assistance unit 56 is capable of performing diagnostic assistance processing to send information required for abnormal diagnosis of the front bulkhead 35 to the management server 20. The diagnostic assistance unit 56 starts diagnostic assistance processing when the main system starts.

[0096] like Figure 5 As shown, when the diagnostic assistance process begins, the diagnostic assistance unit 56 executes the process of step S510. In step S510, the diagnostic assistance unit 56 determines whether the diagnostic prerequisites are met. The content of the process of step S510 is the same as that of step S110 in the first embodiment. Therefore, the description of the process of step S510 is omitted. If the diagnostic prerequisites are not met, the diagnostic assistance unit 56 executes the process of step S510 again (step S510: No). The diagnostic assistance unit 56 repeatedly performs the process of step S510 until the diagnostic prerequisites are met. Then, when the diagnostic prerequisites are met, the diagnostic assistance unit 56 moves the process to step S520 (step S510: Yes).

[0097] In step S520, the diagnostic assistance unit 56 determines whether the notifier 33 is issuing a notification tone. The processing in step S520 is the same as that in step S130 of the first embodiment. Therefore, the description of the processing in step S520 is omitted. If the notifier 33 is not issuing a notification tone, the diagnostic assistance unit 56 returns to the processing in step S510 (step S520: No). The diagnostic assistance unit 56 repeatedly performs the processing in steps S510 and S520 until the notifier 33 issues a notification tone when the diagnostic prerequisite is met. Then, when the notifier 33 issues a notification tone when the diagnostic prerequisite is met, the diagnostic assistance unit 56 moves the processing to step S530 (step S520: Yes).

[0098] In step S530, the diagnostic assistance unit 56 acquires the latest value of the sound pressure level L received by the control device 50 from the microphone 36. Then, the diagnostic assistance unit 56 generates diagnostic information containing the acquired sound pressure level L and the vehicle's individual identification information. The diagnostic assistance unit 56 then sends the diagnostic information to the management server 20. After executing the processing in step S530, the diagnostic assistance unit 56 terminates the series of diagnostic assistance processes. It should be noted that, depending on the determination results of steps S510 and S520, sometimes the main system is shut down before terminating the series of diagnostic assistance processes.

[0099] When the server diagnostic unit 22 of the management server 20 receives diagnostic information sent by the diagnostic assistance unit 56, it begins server diagnostic processing. Upon starting server diagnostic processing, the server diagnostic unit 22 performs step S610. In step S610, the server diagnostic unit 22 acquires notification tone detection data and vehicle model information. Specifically, the server diagnostic unit 22 reads the sound pressure level L from the received diagnostic information. The server diagnostic unit 22 processes the read value as notification tone detection data. Additionally, the server diagnostic unit 22 reads the vehicle model of the vehicle being diagnosed from the received diagnostic information. After performing the above processing, the server diagnostic unit 22 proceeds to step S620. It should be noted that the processing in step S610 is an acquisition process.

[0100] In step S620, the server diagnostic unit 22 determines whether an abnormality has occurred in the front bulkhead 35. When determining whether the front bulkhead 35 is abnormal, the server diagnostic unit 22 first selects the notification sound reference data corresponding to the model of the vehicle being diagnosed from the notification sound reference data for each vehicle model. Then, the server diagnostic unit 22 calculates the notification sound difference value obtained by subtracting the selected notification sound reference data from the notification sound detection data obtained in step S610.

[0101] After calculating the notification tone difference value, the server diagnostic unit 22 compares the notification tone difference value with the specified notification tone value. When performing this comparison, the server diagnostic unit 22 first selects the notification tone specified value corresponding to the model of the vehicle being diagnosed from the notification tone specified values ​​for each vehicle model. Then, the server diagnostic unit 22 compares the selected notification tone difference value with the specified notification tone value. If the notification tone difference value is less than the specified notification tone value, the server diagnostic unit 22 determines that the front bulkhead 35 is not abnormal (step S620: No). In this case, the server diagnostic unit 22 terminates the series of processes for server diagnostic processing.

[0102] On the other hand, in step S620, if the difference in the notification tone is above the specified value, the server diagnostic unit 22 determines that the front panel 35 has malfunctioned (step S620: Yes). In this case, the server diagnostic unit 22 proceeds to step S630. It should be noted that the process in step S620 is a determination process.

[0103] In step S630, the server diagnostic unit 22 stores the meaning that the front panel 35 of the vehicle being diagnosed is abnormal. Afterwards, the server diagnostic unit 22 completes a series of processes related to server diagnostics. It should be noted that the administrator of the management server 20 reads the abnormal information related to the front panel 35 to understand the status of the vehicle 30.

[0104] <Function of the second implementation method>

[0105] The diagnostic assistance unit 56 of vehicle 30 sends diagnostic information to management server 20 when the notification device 33 emits a notification tone during the operation of vehicle 30, provided that the diagnostic prerequisites are met. Upon receiving the diagnostic information, the server diagnostic unit 22 of management server 20 acquires the notification tone detection data and determines whether there is any abnormality in front bulkhead 35.

[0106] <Effects of the second implementation method>

[0107] According to this embodiment, in addition to the same effects as those described in (1-1) to (1-4), the following effect (2-1) can also be obtained.

[0108] (2-1) In this embodiment, a single diagnostic device performs diagnostics on multiple vehicles 30. With this structure, high accuracy is ensured by utilizing the notification tone reference data and specified values ​​for each vehicle model. Here, for example, it may be necessary to update the specified values ​​for each vehicle model's notification tone. In a structure where a diagnostic device is installed in the control device 50 of each vehicle 30, as in the first embodiment, the aforementioned update requires verifying the vehicle model and updating the notification tone specified values ​​for each vehicle's control device 50, which is cumbersome. However, if, as in this embodiment, multiple vehicles 30 share a single diagnostic device, only the change information needs to be processed for that single diagnostic device, i.e., the management server 20, and only the notification tone specified values ​​for the number of vehicle models need to be changed. Therefore, the update process is very simple. In this way, the management of the diagnostic device can be simplified in this embodiment.

[0109] <Example of Change>

[0110] The first and second embodiments can be implemented by modifications as follows. The first embodiment, the second embodiment, and the following modifications can be combined with each other to implement them within the scope of technical non-inconsistency.

[0111] Regarding the first embodiment, either the notification tone or the siren can be used to diagnose the abnormality of the front bulkhead 35. Alternatively, regarding the second embodiment, the siren can be used instead of the notification tone to diagnose the abnormality of the front bulkhead 35, or both the notification tone and the siren can be used. In the case of using the siren to diagnose the abnormality of the front bulkhead 35 in the second embodiment, the siren can simply be sounded when the vehicle 30 is parked at the vehicle base, as in the first embodiment. Then, the sound pressure level L detected by the microphone 36 when the siren is sounded can be sent to the management server 20 as diagnostic information.

[0112] • The area where the siren can be issued is not limited to the vehicle depot. The area can be any location with a sign indicating that a siren is to be sounded. It should be noted that the area where the siren can be issued should preferably be determined by considering the noise level it will cause to the surrounding area.

[0113] • The siren can also be activated while the vehicle 30 is in motion to diagnose the front bulkhead 35. • The content of the diagnostic prerequisites is not limited to that shown in the first and second embodiments. As long as appropriate data for diagnosing the abnormality of the front bulkhead 35 can be obtained, the content and number of items in the diagnostic prerequisites are not limited.

[0114] The diagnostic prerequisites in the first and second embodiments are designed to exclude sounds other than the sound of the object being detected. However, the diagnostic prerequisites may also include items such as the presence of a specific sound. For example, items such as an occupant riding may be included. Additionally, items such as the presence of the operating sound of a specific device M may be included. Even when using diagnostic prerequisites that include these items, appropriate diagnosis can be performed as long as the notification tone reference data and siren reference data are determined under the premise that the diagnostic prerequisites are met.

[0115] The notification tone reference data is not limited to the data shown in the first and second embodiments. The notification tone reference data only needs to be suitable for the determination process. The sound of an abnormality occurring in the front panel 35 can also be used as the notification tone reference data. Alternatively, for example, an abnormality in the front panel 35 can be determined when the detection tone data and the notification tone reference data are of the same level. Furthermore, as explained in the following modification examples, depending on the determination method used in the determination process, the reference tone data may not be calculated by statistically processing the sound pressure level L as in the first embodiment, but rather the instantaneous value of the sound pressure level L may be used as the notification tone reference data. The same applies to the siren reference data.

[0116] The determination method used in the determination process and the method of acquiring the detection tone data in the acquisition process are not limited to the methods shown in the first and second embodiments. The determination method used in the determination process only needs to be able to appropriately determine whether the front panel 35 is abnormal. Furthermore, in the acquisition process, only the data required for the determination process needs to be acquired. For example, in the determination process, the decay rate of the sound pressure level L after the notifier 33 emits the notification tone can be used as an indicator for determination. In this case, in the acquisition process, the sound pressure level L detected by the microphone 36 is continuously acquired as notification tone detection data from the moment the notifier 33 emits the notification tone until a predetermined period has elapsed. That is, a time series of notification tone detection data is acquired. It should be noted that this time series is acquired under the condition that the diagnostic preconditions are continuously met. In the determination process, the decay rate related to the notification tone detection data, i.e., the detection decay rate, is calculated using the above time series. For example, the detection decay rate is calculated by dividing the value obtained by subtracting the last value from the first value of the above time series by the predetermined period. Then, the calculated detection decay rate is compared with the reference decay rate. If the former is more than a specified speed lower than the latter, the front bulkhead 35 is determined to be abnormal. That is, if the value obtained by subtracting the detection decay rate from the reference decay rate is above the specified speed, the front bulkhead 35 is determined to be abnormal.

[0117] The reference attenuation rate is the rate attenuation of the sound pressure level L after the notifier 33 emits its notification tone, assuming no abnormalities occur in the front bulkhead 35. The reference attenuation rate is calculated as follows: First, when the vehicle 30 being diagnosed is in a new condition, the sound pressure level L detected by the microphone 36 is continuously acquired as the notification tone reference data from the time the notifier 33 emits its notification tone until a predetermined period has elapsed. That is, a time series of the notification tone reference data is acquired. Similar to the acquisition of the notification tone detection data, a time series of the notification tone reference data is acquired while the diagnostic preconditions remain unchanged. After acquiring the time series of the notification tone reference data, the attenuation rate of the sound pressure level L is calculated based on this time series. Using this calculation method, the attenuation rate is calculated for multiple time series, and the average of the multiple attenuation rates is used as the reference attenuation rate. It should be noted that the specified rate used in the judgment process can be determined to be a value such that a difference in attenuation rate exists between the detected attenuation rate and the reference attenuation rate, which would not occur under normal conditions of the front bulkhead 35. In addition, the specified period can be determined as the length suitable for calculating the decay rate of the sound pressure level L.

[0118] When the sound insulation material in the front bulkhead 35 deteriorates or the mounting parts detach, the notification sound emitted by the announcer 33 may be difficult to attenuate inside the carriage 31. In this case, the sound pressure level L detected by the microphone 36 is likely to attenuate at a slower rate. In the above-described determination method, by utilizing this characteristic to determine the abnormality of the front bulkhead 35, it is possible to properly determine whether there is an abnormality.

[0119] • In the determination process, a power spectrum obtained by frequency analysis of the time series of sound pressure level L during the period when the notification tone is emitted by the notifier 33 can also be used. A power spectrum is a graph representing the energy of sound pressure level L per unit frequency. When determining using the power spectrum, in the acquisition process, the sound pressure level L detected by the microphone 36 is continuously acquired as notification tone detection data for a certain period during which the notifier 33 emits the notification tone. That is, a time series of notification tone detection data is acquired. In the determination process, the power spectrum based on this time series, i.e., the detected power spectrum, is compared with a reference power spectrum. Then, if the energy of sound pressure level L in the detected power spectrum at a specific frequency is greater than a predetermined energy by the energy of sound pressure level L in the reference power spectrum, it is determined that an abnormality has occurred in the front panel 35.

[0120] The reference power spectrum is the power spectrum related to the time series of the sound pressure level L detected by the microphone 36 when the notifier 33 emits a notification tone within a certain period of time, assuming that the front bulkhead 35 is not abnormal. Similar to the example of changing the decay rate described above, the reference power spectrum can be obtained and calculated, for example, as the notification tone reference data when the vehicle 30 under diagnostic conditions is in a new state. Furthermore, the energy is specified to be a value that indicates an energy difference between the detected power spectrum and the reference power spectrum that would not occur under normal conditions of the front bulkhead 35.

[0121] When using power spectrum analysis, it is possible to distinguish sounds emitted by multiple sources based on frequency. Therefore, it is suitable for eliminating the influence of sounds other than the sound being detected in order to determine if there are any abnormalities. Furthermore, since sound sources can be distinguished when using power spectrum analysis, diagnostic prerequisites are not necessarily required when acquiring detection sound data through acquisition and processing. This increases the diagnostic opportunities for the front bulkhead 35.

[0122] • As described in the above-mentioned change examples, it is not necessary to set diagnostic prerequisites.

[0123] • Vehicle 30 is not limited to a vehicle that only performs autonomous driving. That is, vehicle 30 can be configured to switch between autonomous driving and driver-based driving, or it can be configured to drive only based on driver operation.

[0124] • In the case of a vehicle 30 that can be driven based on the driver's operation, the abnormality of the front panel 35 can also be diagnosed when the siren is emitted from the siren 34 in conjunction with the driver's operation.

[0125] The structural components of vehicle 30 are not limited to those shown in the above embodiments. For example, in addition to an electric generator 37, vehicle 30 may also have an internal combustion engine as a drive source inside the motor compartment 32. When vehicle 30 has an internal combustion engine, motor compartment 32 may also be referred to as engine compartment.

[0126] • The sound source used for diagnosing the front bulkhead 35 is not limited to the notification device 33 or the siren 34. Any sound source located on the side opposite the passenger compartment 31, separated from the front bulkhead 35, can be used to properly diagnose abnormalities in the front bulkhead 35. For example, as in the modified example described above, if the vehicle 30 has an internal combustion engine, the internal combustion engine can also be used as the sound source. Then, the operating sound of the internal combustion engine can also be used to diagnose abnormalities in the front bulkhead 35.

[0127] Regarding the diagnosis of the front bulkhead 35, the sound emitted by the sound source can be determined in advance, as long as at least one of the sound pressure and frequency is predetermined. Appropriate diagnostic methods can be used based on the determined sound elements. For example, if the sound pressure of the sound emitted by the sound source is determined, similar to the above embodiment, an abnormality in the front bulkhead 35 can be appropriately diagnosed simply by using a diagnostic method utilizing the magnitude of the sound pressure. Furthermore, for example, if the frequency of the sound emitted by the sound source is determined, an abnormality in the front bulkhead 35 can be appropriately diagnosed simply by using a diagnostic method utilizing the attenuation rate of the sound pressure, as described in the modified example above.

[0128] • When a sound source different from the notification device 33 and the siren 34 is used as the sound source for diagnosis of the front panel 35, the frequency of the sound emitted by this sound source is not limited to the frequencies within the audible range. Since the sound source in this case is not intended to make others perceive the sound, even sounds at frequencies outside the audible range will not affect the diagnosis.

[0129] • The vehicles subject to diagnosis are not limited to those in the shared utilization system 10. For example, private cars can also be included in the diagnosis.

[0130] The component to be diagnosed is not limited to the front bulkhead 35. Any component that separates the interior and exterior of the passenger compartment 31 can be used as a diagnostic component. As long as the sound source is located on the opposite side of the passenger compartment 31, separated from the component to be diagnosed, it can be diagnosed appropriately in the same way as the case of diagnosing the front bulkhead 35. For example, the vehicle door could also be a component to be diagnosed. Additionally, the vehicle roof could also be a component to be diagnosed. If a vehicle, such as a promotional vehicle, has a speaker mounted on its roof, that speaker can be used as a sound source. Furthermore, the sound emitted by the speaker can be used to diagnose abnormalities in surrounding components, including the roof.

[0131] The external device is not limited to the management server 20 of the shared system 10. For example, the external device may also be a processing device used in a vehicle maintenance factory.

[0132] • The physical quantity detected by microphone 36 is not limited to sound pressure level L. The physical quantity detected by microphone 36 can also be the sound pressure itself. The physical quantity processed as detection tone data in the acquisition process can be changed based on the physical quantity detected by microphone 36, and the physical quantity of data used for diagnosis, such as notification tone reference data and notification tone specified value, can also be changed based on the physical quantity.

Claims

1. A vehicle diagnostic system, wherein, This vehicle diagnostic system has the following features: Diagnostic devices are used to diagnose abnormalities in components that separate the interior from the exterior of a vehicle's passenger compartment. A sound source, located outside the carriage, emits a sound whose sound pressure and frequency are predetermined, the sound being used to notify the surroundings of the presence of the vehicle; as well as The microphone is located inside the carriage. The diagnostic device performs: The acquisition process involves acquiring detection sound data related to the sound pressure level of the sound detected by the microphone when the sound source emits the sound. as well as The determination process involves comparing the detected sound data related to the sound emitted by the sound source with predetermined reference sound data related to the sound during the vehicle's operation to determine whether the component is abnormal. The reference tone data is the sound pressure level detected by the microphone when the sound source emits the sound, assuming that the component is not malfunctioning.

2. The vehicle diagnostic system according to claim 1, wherein, The sound pressure level of the sound emitted by the sound source is predetermined. In the determination process, the diagnostic device determines whether the component is abnormal based on the difference between the sound pressure of the detected sound data and the sound pressure of the reference sound data.

3. The vehicle diagnostic system according to claim 1, wherein, The frequency of the sound emitted by the sound source is predetermined. When the decay rate of the sound pressure after the sound source finishes emitting sound is taken as the sound pressure decay rate... In the determination process, the diagnostic device determines whether the component is abnormal based on the difference between the sound pressure attenuation rate of the detected sound data and the sound pressure attenuation rate of the reference sound data.

4. The vehicle diagnostic system according to claim 1, wherein, The sound source emits the sound when the vehicle is parked in a predetermined area. In the determination process, the diagnostic device compares the detection sound data related to the sound emitted by the sound source when the vehicle is parked with the reference sound data of the sound to determine whether the component is abnormal.

5. The vehicle diagnostic system according to any one of claims 1 to 4, wherein, The diagnostic device is mounted on the vehicle.

6. The vehicle diagnostic system according to any one of claims 1 to 4, wherein, The vehicle diagnostic system includes an external device capable of wireless communication with the vehicle. The diagnostic device is located on the external device and stores the reference sound data for multiple vehicle models according to each vehicle model. In the acquisition process, the diagnostic device acquires the detection sound data and the vehicle model information of the target vehicle from the vehicle on which the malfunction of the component is being diagnosed. In the determination process, the diagnostic device compares the detection sound data acquired in the acquisition process with the reference sound data corresponding to the model of the vehicle being diagnosed.

7. The vehicle diagnostic system according to any one of claims 1 to 4, wherein, The component is the component that separates the engine compartment or motor compartment of the vehicle from the passenger compartment.

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