WO2011111265A1

WO2011111265A1 - Vehicle diagnostic system, vehicle diagnostic device, and vehicle diagnostic method

Info

Publication number: WO2011111265A1
Application number: PCT/JP2010/069717
Authority: WO
Inventors: 哲春本; 博文田口; 悠作松田
Original assignee: 富士通テン株式会社
Priority date: 2010-03-08
Filing date: 2010-11-05
Publication date: 2011-09-15
Also published as: JP2011185727A

Abstract

Disclosed are a vehicle diagnostic system, a vehicle diagnostic device, and a vehicle diagnostic method wherein it is possible to provide sufficient services to the user of the vehicle. Specifically, disclosed is a vehicle diagnostic system in which a vehicle diagnostic device receives a status value indicating the operational status of vehicle mounted devices mounted on a vehicle to be diagnosed from said vehicle by means of wireless communication, and determines whether or not the status value thus received is within the normal range of the distribution of status values, which is obtained from the vehicle when the vehicle mounted devices are operating normally, thereby diagnosing the vehicle that sent the aforementioned status value.

Description

Vehicle diagnostic system, vehicle diagnostic device, and vehicle diagnostic method

The present invention relates to a vehicle diagnosis system, a vehicle diagnosis device, and a vehicle diagnosis method, and more particularly, to a vehicle diagnosis system, a vehicle diagnosis device, and a vehicle diagnosis method that can provide sufficient service to a vehicle user.

Conventionally, vehicles are equipped with an electronic control unit (ECU) that controls the operation of various operating parts such as an engine, a transmission, and a brake. The ECU appropriately controls the operation of each operation unit by driving an actuator or the like based on the state of each operation unit detected by a large number of sensors provided in the vehicle.

As described above, a vehicle that automatically controls the operation of each operation unit by electronic control is provided with a storage device that periodically stores information on the operation state of each sensor and actuator (hereinafter referred to as “vehicle information”). (For example, see Patent Document 1).

In a conventional vehicle diagnosis system, when a vehicle user enters a vehicle into a maintenance factory for inspection or the like, vehicle information is read from a vehicle storage device and analyzed using a dedicated vehicle diagnosis device. I was diagnosing the vehicle.

JP 2007-213393 A

However, in the conventional vehicle diagnosis system, the vehicle cannot be diagnosed until after the user enters the vehicle into the maintenance shop, so there is a possibility that sufficient services cannot be provided to the user of the vehicle. .

For example, in a conventional vehicle diagnosis system, if an abnormality is detected in a vehicle due to a diagnosis at a maintenance shop and it is necessary to replace the parts, the parts are quickly replaced if the necessary parts are not in stock in the maintenance shop. I can't.

In this case, in the conventional vehicle diagnosis system, you can not exchange the parts unless you have the vehicle left at the maintenance shop until the necessary parts are ready, or if you do not have the vehicle entered the maintenance shop at a later date, Sufficient service cannot be provided to the user of the vehicle.

The present invention has been made in view of the above, and an object of the present invention is to provide a vehicle diagnosis system, a vehicle diagnosis device, and a vehicle diagnosis method capable of providing sufficient service to a vehicle user.

In order to solve the above-described problems and achieve the object, a vehicle diagnosis system according to the present invention includes a vehicle diagnosis device that diagnoses the vehicle based on a state value indicating an operation state of the vehicle-mounted device acquired by the vehicle. In the vehicle diagnosis system, the vehicle includes transmission means for transmitting the state value of the on-vehicle device to the vehicle diagnosis device by wireless communication, and the vehicle diagnosis device receives the state value of the on-vehicle device from the vehicle. Receiving means by wireless communication, and whether or not the state value received by the receiving means is included in a normal range in the distribution of the state values acquired by the vehicle during normal operation of the vehicle-mounted device And diagnosing means for diagnosing the vehicle that is the transmission source of the state value.

According to the present invention, the vehicle can be diagnosed without having the vehicle go into the maintenance shop. For example, when an abnormality of the vehicle is detected, preparations for eliminating the abnormality are made in advance. Therefore, there is an effect that a sufficient service can be provided to the user of the vehicle.

FIG. 1 is a diagram showing an outline of a conventional vehicle diagnostic method. FIG. 2 is a diagram showing an outline of the vehicle diagnosis method according to the present invention. FIG. 3 is a block diagram illustrating configurations of the in-vehicle device and the vehicle diagnostic device in the vehicle diagnostic system according to the present embodiment. FIG. 4 is a diagram illustrating an example of a probe history and determination criteria according to the present embodiment. FIG. 5 is a diagram illustrating a determination criterion setting procedure according to the present embodiment. FIG. 6 is a diagram illustrating a method in which the vehicle diagnosis apparatus according to the present embodiment creates a normal distribution for each age. FIG. 7 is a flowchart illustrating processing executed by the in-vehicle device according to the present embodiment. FIG. 8 is a flowchart illustrating processing executed by the vehicle diagnostic apparatus according to the present embodiment. FIG. 9 is a flowchart illustrating processing executed by the vehicle diagnostic apparatus according to the present embodiment. FIG. 10 is a diagram illustrating a modification example regarding a transmission timing of a diagnosis result by the vehicle diagnosis apparatus according to the present embodiment.

Hereinafter, preferred embodiments of a vehicle diagnosis system, a vehicle diagnosis device, and a vehicle diagnosis method according to the present invention will be described in detail with reference to the accompanying drawings. First, prior to detailed description of the embodiments, an outline of a vehicle diagnosis method according to the present invention will be described in comparison with a conventional vehicle diagnosis method.

FIG. 1 is a diagram showing an outline of a conventional vehicle diagnostic technique, and FIG. 2 is a diagram showing an outline of a vehicle diagnostic technique according to the present invention. Here, a case where the diagnosis of the vehicle is performed based on the operation state of each sensor and actuator related to the engine control of the vehicle will be described as an example.

As shown in FIG. 1 (A), in the conventional vehicle diagnosis method, information (hereinafter referred to as “vehicle”) regarding the operating state of each operating unit (here, engine E) of the vehicle C while the vehicle C is running or stopped. Information ") is stored in the in-vehicle device 100 (see (1) in the figure).

In the conventional vehicle diagnosis method, when performing vehicle diagnosis, as shown in FIG. 1B, the vehicle C is stored in a maintenance factory D such as a dealer, and the vehicle diagnosis device 200 uses the vehicle information from the in-vehicle device 100 to the vehicle information. Is read out (see (2) in the figure). Subsequently, in the conventional vehicle diagnostic technique, the vehicle diagnosis is performed by analyzing the vehicle information read by the vehicle diagnostic apparatus 200 (see (3) in the figure).

However, in the conventional vehicle diagnosis method, the vehicle C can only be diagnosed after the user has moved the vehicle C into the maintenance shop D, and therefore sufficient service cannot be provided to the user of the vehicle C. There was a fear.

That is, in the conventional vehicle diagnosis method, since the vehicle is diagnosed only after the vehicle C is received at the maintenance shop D, it may not be possible to quickly respond to the abnormality detected by the diagnosis. For example, in the conventional vehicle diagnosis method, when an abnormality is detected in the vehicle C by the diagnosis at the maintenance shop D and parts need to be replaced, necessary parts may not be in stock in the maintenance shop D. .

In this case, in the conventional vehicle diagnosis method, the parts cannot be exchanged unless the vehicle C is left at the maintenance shop D until the necessary parts are prepared or the vehicle C is received at the maintenance shop D at a later date. . In this case, a satisfactory service cannot be provided to the user of the vehicle C. Further, usually, the user often brings the vehicle C to the maintenance shop D after feeling uncomfortable with the vehicle C. In this case, there is a case where a sign (sign) of abnormality cannot be detected.

Therefore, in the vehicle diagnosis method according to the present invention, as shown in FIG. 2, various information is transmitted and received between the in-vehicle device 1 and the vehicle diagnosis device 2 by wireless communication, so that the vehicle C is not stored in the maintenance shop D. Next, the vehicle C is diagnosed.

In particular, in the vehicle diagnostic method according to the present invention, the vehicle diagnostic device 2 receives a state value indicating the operating state of each vehicle-mounted device by wireless communication from the vehicle-mounted device 1 of a plurality of vehicles on which the same type of vehicle-mounted device is mounted. And collect.

Then, the vehicle diagnosis apparatus 2 generates a distribution indicating the variation of the state value for each collected state value type, and sets a range of state values that can be regarded as statistically valid from the generated distribution as a normal range.

Thereafter, the vehicle diagnostic device 2 determines whether or not an abnormality has occurred in the vehicle to be diagnosed by determining whether or not the state value received from the in-vehicle device 1 of the vehicle to be diagnosed is included in the normal range. Diagnose.

Specifically, in the vehicle diagnosis method according to the present invention, when the vehicle C is traveling or stopped, the in-vehicle device 1 acquires vehicle information related to the operation state of each operation unit (here, the engine E) of the vehicle C. (See (1) in the figure). Here, the in-vehicle device 1 acquires and stores a state value indicating an operation state of each on-vehicle device as vehicle information from the on-vehicle device such as a sensor or an actuator related to the engine E.

The in-vehicle device 1 transmits the stored vehicle information at a predetermined timing to the vehicle diagnostic device D provided in the maintenance factory D such as a dealer by wireless communication (see (2) in the figure). Here, the in-vehicle device 1 transmits the vehicle information and the identification information of the vehicle C to the vehicle diagnosis device 2 in association with each other.

On the other hand, the vehicle diagnostic device 2 receives vehicle information from the in-vehicle device 1 by wireless communication (see (3) in the figure). And the vehicle diagnostic apparatus 2 diagnoses the vehicle C by analyzing the vehicle information received from the vehicle-mounted apparatus 1 (refer (4) of the figure).

Here, when the vehicle diagnosis apparatus 2 receives the state value of the vehicle-mounted device related to the engine E from the vehicle-mounted device 1, the distribution of the state values that the received state value should be acquired by the vehicle-mounted device 1 during the normal operation of the vehicle-mounted device. The vehicle C is diagnosed by determining whether or not it is included in the normal range.

As described above, in the vehicle diagnosis method according to the present invention, the vehicle diagnosis apparatus 2 diagnoses the vehicle C by analyzing the vehicle information received from the in-vehicle apparatus 1, and therefore the vehicle C is prepared for the diagnosis of the vehicle C. There is no need to have factory D in stock.

Further, according to the vehicle diagnostic method of the present invention, for example, when the dealer of the vehicle C detects an abnormality of the vehicle C by the vehicle diagnostic device 2, before the vehicle C enters the maintenance shop D for repair. Prepare for repairs.

Therefore, according to the vehicle diagnosis method of the present invention, the dealer of the vehicle C can quickly repair the vehicle C on the spot when the vehicle C enters the maintenance factory D. Can provide a satisfactory and satisfactory service.

Further, in the vehicle diagnosis method according to the present invention, the vehicle diagnosis device 2 diagnoses a sign of abnormality in the vehicle C based on the vehicle information received from the in-vehicle device 1. For example, the vehicle diagnostic apparatus 2 is abnormal when the state value received from the in-vehicle apparatus 1 is included in a first predetermined range that constitutes a boundary portion that determines whether the state value is normal or abnormal. Judge that there is a sign of.

Thus, according to the vehicle diagnosis method of the present invention, for example, when the dealer of the vehicle C detects a sign of abnormality in the vehicle C, the dealer C in advance of the abnormality expected to occur in the vehicle C in the near future. You can make preparations.

Further, in the vehicle diagnosis method according to the present invention, the vehicle diagnosis device 2 receives and stores vehicle information from the plurality of in-vehicle devices 1 and sets a normal range related to the vehicle information based on the stored vehicle information.

Here, the vehicle diagnostic apparatus 2 generates a distribution indicating the variation of the state value for each state value type using the plurality of stored state values. And the vehicle diagnostic apparatus 2 sets the 2nd predetermined range centering on the average value of the produced | generated distribution as a normal range.

As described above, the vehicle diagnosis apparatus 2 statisticizes the state values that are actually measured values received from the in-vehicle apparatuses 1 of the plurality of vehicles C, and sets the range of state values that can be regarded as statistically normal as the normal range. It is possible to set a normal range with high reliability in conformity with. For this reason, according to the vehicle diagnostic method of the present invention, the diagnostic accuracy of the vehicle can be improved.

In the vehicle diagnostic method according to the present invention, the vehicle diagnostic apparatus 2 compares the set normal range with the received state value (stored state value), and as a result, the abnormal state value is not included in the normal range. Is deleted from the stored state value group.

Then, the vehicle diagnosis apparatus 2 periodically updates the normal range using a state value group in which abnormal state values are sequentially deleted. For this reason, according to the vehicle diagnostic method according to the present invention, the vehicle diagnostic apparatus 2 can improve the reliability of the normal range every time the normal range is updated.

Further, in the vehicle diagnosis method according to the present invention, the in-vehicle device 1 uses a part of all the acquired state values during the period until the vehicle diagnosis device 2 detects a sign of abnormality in the vehicle C. 2 to send.

On the other hand, when the vehicle diagnostic device 2 detects a sign of abnormality in the vehicle C, the vehicle diagnostic device 2 transmits the diagnosis result to the in-vehicle device 1. And when the vehicle-mounted apparatus 1 receives the diagnostic result which shows that the abnormal sign was detected from the vehicle diagnostic apparatus 2, all the untransmitted state values related to the received diagnostic result are transmitted to the vehicle diagnostic apparatus 2. .

For this reason, according to the vehicle diagnosis method according to the present invention, since the in-vehicle device 1 does not need to periodically transmit all the state values acquired from the vehicle to the vehicle diagnosis device 2, the processing load of communication processing and communication The cost required for this can be reduced.

Moreover, according to the vehicle diagnostic method according to the present invention, when the vehicle diagnostic apparatus 2 detects a sign of abnormality in the vehicle C, the vehicle diagnostic apparatus 2 receives all the state values related to the sign from the in-vehicle apparatus 1 and receives all the received values. The cause of the anomaly sign can be analyzed in detail using the state value.

Further, in the vehicle diagnosis method according to the present invention, the in-vehicle device 1 stores a prescribed value prescribed in advance for each type of state value. Such a prescribed value is an ideal design value that should be obtained by the in-vehicle device 1 when each on-vehicle device is operating normally.

And when there is a difference between the state value acquired from the vehicle-mounted device and the specified value, the vehicle-mounted device 1 corrects and controls the operation of each vehicle-mounted device so that the state value approaches the specified value, and is obtained by the correction control. The state value is transmitted to the vehicle diagnostic apparatus 2.

For this reason, since the vehicle diagnostic apparatus 2 can set the normal range of the state value based on the state value brought close to the specified value by the correction control by the in-vehicle apparatus 1, the reliability of the normal range is further improved. be able to.

Next, preferred embodiments of the vehicle diagnosis system, the vehicle diagnosis apparatus, and the vehicle diagnosis method according to the present invention will be described in detail with reference to FIGS. In the following, a diagnosis relating to the operation of the engine of the vehicle will be described as an example, but the diagnosis target according to the present invention is not limited to the engine.

FIG. 3 is a block diagram illustrating the configuration of the in-vehicle device and the vehicle diagnostic device in the vehicle diagnostic system according to the present embodiment. FIG. 4 is a diagram illustrating an example of the probe history and the determination criterion according to the present embodiment. FIG. 5 is a diagram illustrating a determination criterion setting procedure according to the present embodiment.

FIG. 6 is a diagram illustrating a method in which the vehicle diagnostic apparatus according to the present embodiment creates a normal distribution for each time period, and FIG. 7 is a flowchart illustrating processing executed by the in-vehicle apparatus according to the present embodiment. 8 and 9 are flowcharts showing processing executed by the vehicle diagnostic apparatus according to the present embodiment, and FIG. 10 shows a modified example related to the transmission timing of the diagnosis result by the vehicle diagnostic apparatus according to the present embodiment. FIG.

As shown in FIG. 3, the vehicle diagnosis system S according to the present embodiment includes an in-vehicle device 1 mounted on a vehicle and a vehicle diagnosis device 2 installed in a maintenance factory such as a dealer. In the figure, only components necessary for explaining the characteristics of the vehicle diagnosis system S are shown, and descriptions of general components are omitted.

As shown in the figure, the in-vehicle device 1 includes a communication unit 11, a display unit 12, a storage unit 13, and a control unit 14. The display unit 12 may be separate from the in-vehicle device 1.

Here, the communication unit 11 is a communication interface that transmits and receives various kinds of information to and from the vehicle diagnostic device 2, and the display unit 12 is a video display device that displays a result of vehicle diagnosis by the vehicle diagnostic device 2. .

The storage unit 13 is an information storage device that stores the vehicle information 131 and the specified value 132. Here, the vehicle information 131 includes a state value indicating an operation state of the vehicle-mounted device such as an actuator or a sensor constituting each operation unit included in the vehicle such as an engine and a transmission of the vehicle.

For example, the vehicle information 131 includes a plurality of types of state values such as a state value indicating the ratio of the fuel injection amount and the intake air to the accelerator opening, and a state value indicating the ratio of the fuel injection amount and the engine speed. It is. The vehicle information 131 also includes vehicle identification information and vehicle type identification information.

The prescribed value 132 is a value prescribed in advance for each type of each state value, and specifically, a design ideal value acquired by the in-vehicle device 1 when each on-vehicle device is operating normally. It is.

The control unit 14 is a processing unit that performs overall control of the overall operation of the in-vehicle device 1, and includes, for example, an information processing device having a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). It is constituted by.

Then, the control unit 14 reads out various programs from the ROM and executes them using the RAM as a work area. The control unit 14 functions as an information acquisition unit 141, a correction unit 142, a probe information transmission unit 143, and a diagnosis result. A notification unit 144.

Here, the information acquisition unit 141 is a processing unit that acquires a state value indicating the operation state of each actuator 16 from the plurality of sensors 15 that sense the operation state of each actuator 16 and stores the state value in the storage unit 13. Further, the information acquisition unit 141 outputs the acquired state value to the correction unit 142.

Further, the correction unit 142 compares the state value input from the information acquisition unit 141 with the specified value 132 stored in the storage unit 13, and if there is a difference between the two values, the correction unit 142 inputs from the information acquisition unit 141. The operation of each actuator 16 is corrected and controlled so that the state value to be set approaches the specified value.

The probe information transmission unit 143 is a processing unit that periodically reads the vehicle state information 131 from the storage unit 13 and outputs the vehicle state information 131 as probe information to the communication unit 11, thereby transmitting the probe information to the vehicle diagnostic apparatus 2.

Here, the probe information transmission unit 143 sets probe information in which some of the state values acquired by the information acquisition unit 141 are associated with vehicle identification information and vehicle type identification information at a predetermined timing. Is periodically transmitted to the vehicle diagnosis apparatus 2.

The probe information transmission unit 143 can selectively transmit the state values acquired from some of the sensors 15 among all the sensors 15. In addition, the probe information transmission unit 143 can generate one state value using a plurality of state values acquired from a plurality of related sensors 15 and can transmit the generated one state value.

For example, the probe information transmission unit 143 uses the state value indicating the accelerator opening, the state value indicating the fuel injection amount, and the state value indicating the intake air amount to determine the amount of fuel injection and intake air for the accelerator opening. A state value indicating the ratio can be generated, and the generated state value can be transmitted to the vehicle diagnostic apparatus 2.

Thus, the probe information transmission unit 143 reduces the processing load of communication processing and the cost required for communication by limiting the amount of probe information to be transmitted when periodically transmitting probe information.

Further, when the in-vehicle device 1 receives a diagnosis result indicating an abnormality sign described later from the vehicle diagnostic device 2, the probe information transmission unit 143 sends all untransmitted state values related to the abnormality sign to the vehicle diagnostic device 2. Send. At this time, the probe information transmission unit 143 transmits probe information including all state values related to the abnormality sign during a period in which the vehicle is stopped.

As described above, the probe information transmission unit 143 transmits all the state values related to the sign of abnormality to the vehicle diagnostic apparatus 2 by transmitting probe information having a relatively large amount of information while the vehicle is stopped. Can do.

In addition, the diagnosis result notification unit 144 receives the diagnosis result indicating that there is a vehicle abnormality or a sign of abnormality in the vehicle from the vehicle diagnosis device 2 via the communication unit 11, and the contents of the input diagnosis result. Is a processing unit that outputs to the display unit 12 for display.

Further, when a diagnosis result indicating that the vehicle has a sign of abnormality is input, the diagnosis result notifying unit 144 outputs information indicating that to the probe information transmitting unit 143. Then, when information corresponding to the diagnosis result indicating that the vehicle has a sign of abnormality is input from the diagnosis result notification unit 144 from the diagnosis result notification unit 144, the probe information transmission unit 143 sets an untransmitted state value related to the sign of abnormality. All are transmitted to the vehicle diagnostic apparatus 2.

The vehicle diagnostic apparatus 2 includes a communication unit 21, a storage unit 22, and a control unit 23. The communication unit 21 is a communication interface that transmits and receives various types of information to and from the in-vehicle device 1. The storage unit 22 is a storage device that stores the probe history 221 and the determination reference 222.

Here, the probe history 221 and determination criteria will be described with reference to FIG. As shown in FIG. 4, the probe history 221 stores the history of probe information received by the vehicle diagnostic apparatus 2 from each in-vehicle apparatus 1.

For example, as shown in FIG. 4A, the probe history 221 includes probe information in addition to the reception date when each probe information is received, identification information indicating the vehicle type of the vehicle that transmitted each probe information, and vehicle identification information. Are stored in association with each other.

In FIG. 9A, the vehicle travel distance, the ratio between the fuel injection amount and the intake air amount, and the ratio between the fuel injection amount and the engine speed are shown as examples of the state value. All state values included in the probe information are stored.

Further, as shown in FIG. 5B, the determination criterion 222 stores a normal range α, an abnormal range β, and a predictive range γ for all state values for each vehicle type. In addition, each value (a, b, c, d) shown to the same figure shall satisfy | fill the relationship of a <b <c <d.

Here, the normal range α is a state value range to be acquired by the in-vehicle device 1 when each on-vehicle device mounted on the vehicle is operating normally. The abnormal range β is a range of state values acquired by the in-vehicle device 1 when each on-vehicle device mounted on the vehicle is operating abnormally. The sign range γ is a range of state values acquired by the vehicle-mounted device 1 when there is a sign of abnormal operation in each vehicle-mounted device mounted on the vehicle.

That is, in the example shown in FIG. 5B, the vehicle-mounted device that mixes fuel and air is normal if the ratio of the fuel injection amount and the intake air amount is a to d but less than a or greater than d. If it is abnormal, greater than a and less than b or greater than c and less than d, there is a sign of abnormal operation.

Returning to the description of FIG. 3, the control unit 23 of the vehicle diagnostic device 2 is a processing unit that controls the overall operation of the vehicle diagnostic device 2, and is configured by an information processing device having a CPU, a ROM, and a RAM, for example. Yes.

The control unit 23 reads the various programs from the ROM and executes them using the RAM as a work area. The control unit 23 functions as a normal distribution generation unit 231, a criterion setting unit 232, a probe information extraction unit 233, and a diagnosis unit. 234 and a diagnostic result transmission unit 235.

The normal distribution generation unit 231 is a processing unit that generates a normal distribution related to state value variations for each state value type based on a plurality of probe information received by the vehicle diagnosis apparatus 2 in the past. Then, the normal distribution generation unit 231 outputs the generated normal distribution to the determination criterion setting unit 232. The procedure for creating a normal distribution will be described later with reference to FIG.

The determination criterion setting unit 232 is a processing unit that sets a normal range α, an abnormal range β, and a predictive range γ for each state value type based on the normal distribution input from the normal distribution generation unit 231. Here, a normal distribution generation procedure by the normal distribution generation unit 231 and a determination criterion setting procedure by the determination criterion setting unit 232 will be described with reference to FIG.

Here, a procedure for creating a normal distribution relating to a state value (hereinafter referred to as “fuel / air”) indicating a ratio between the fuel injection amount and the intake air amount and a procedure for setting a determination criterion relating to fuel / air will be described as examples. .

First, the procedure for creating a normal distribution by the normal distribution generation unit 231 will be described. As shown in FIG. 5A, the normal distribution generation unit 231 extracts a plurality of fuel / airs included in the probe information received in the past from the vehicle of the same vehicle type by the vehicle diagnostic apparatus 2 from the probe history 221.

Then, the normal distribution generation unit 231 creates a normal distribution related to fuel / air by calculating a distribution function indicating the variation of each extracted fuel / air. In the figure, the horizontal axis represents the fuel / air value, and the vertical axis represents the number N of fuel / air values extracted from the probe history 221.

Next, a procedure for setting the determination criterion 222 by the determination criterion setting unit 232 will be described. As shown in FIGS. 5A and 5B, when the normal distribution related to fuel / air is input from the normal distribution generation unit 231, the determination criterion setting unit 232 has a range of ± 3σ from the average value in the normal distribution ( In the figure, a to d) are set as the normal range α. Here, σ is a standard deviation of fuel / air in a normal distribution.

Subsequently, as shown in FIG. 5B, the determination criterion setting unit 232 sets a fuel / air range not included in the normal range α as the abnormal range β. Furthermore, the determination criterion setting unit 232 indicates a predetermined range (ab, c, d in the figure) inscribed in both ends (upper limit value and lower limit value) of the normal range α within the set normal range α. Set as γ.

Further, in the vehicle diagnostic apparatus 2, the determination criterion is periodically updated by periodically generating the normal distribution by the normal distribution generation unit 231 and setting the determination criterion 222 by the determination criterion setting unit 232.

Specifically, the state value indicating the operating state of the vehicle-mounted device changes over time. That is, even if the information acquisition unit 141 of the in-vehicle device 1 initially acquires a state value indicating that the on-vehicle device is operating normally from the on-vehicle device, the information acquisition unit 141 of the in-vehicle device with time elapses later. A state value indicating that the vehicle-mounted device is not operating normally may be acquired due to deterioration or the like.

For this reason, when it is time for the OBE to not operate normally in most vehicles, the normal distribution of the state values acquired from the OBE is the normal distribution of the OBE that is not operating normally, that is, the OBE Is a normal distribution of state values indicating that is not operating normally. Therefore, it is difficult to obtain a correct normal range of the vehicle-mounted device from such a normal distribution.

For this reason, the vehicle diagnosis apparatus 2 can also create a normal distribution for each year in consideration of the secular change of the state value. Here, with reference to FIG. 6, an operation example in the case where the vehicle diagnosis apparatus 2 creates a normal distribution for each time will be described.

Note that, here, description will be made by taking as an example the secular change of the state value indicating the ratio between the fuel injection amount and the intake air amount. When the vehicle diagnostic apparatus 2 creates a normal distribution for each age, for example, a state value (herein, simply referred to as “state value”) indicating the ratio between the fuel injection amount and the intake air amount as shown in FIG. ) Is previously stored.

In addition, the horizontal axis in the same figure (A) has shown the elapsed period (age) T after a vehicle was sold, and the vertical axis | shaft has shown the state value. The information indicating the secular change of the state value is, for example, information generated when a vehicle manufacturer performs a vehicle durability test or the like.

In the example shown in FIG. 5A, the state value rises gently in a predetermined normal change period after the vehicle is sold, and rises rapidly when the abnormal change period starts after the normal change period elapses. After that, it has dropped rapidly.

In addition, the state value in the normal operation period shown in FIG. 5A is a state value when the on-vehicle device is operating normally, and the state value in the abnormal period is the state when the on-vehicle device is operating abnormally. It is assumed to be a value.

For this reason, for example, the vehicle diagnostic apparatus 2 is configured such that the normal distribution of the state values (actually measured values) acquired from the respective vehicles at the time “a” in the normal period shown in FIG. (T = a normal distribution in the normal change period) is generated. And the vehicle diagnostic apparatus 2 sets the range of +/- 3 (sigma) from the average value (peak) of normal distribution shown to the same figure (B) as a normal range of a state value. In FIG. 5B, the horizontal axis indicates the state value, and the vertical axis indicates the number of state values acquired from the vehicle.

On the other hand, when the in-vehicle diagnostic device 2 generates a normal distribution of state values (actually measured values) acquired from each vehicle at the time b in the abnormal change period shown in FIG. A normal distribution based on actual measurement values as shown in FIG.

In addition, the horizontal axis in the same figure (C) has shown the state value, and the vertical axis | shaft has shown the number of the state values acquired from the vehicle. The normal distribution based on such actually measured values may indicate a normal distribution of state values acquired from the vehicle-mounted device that is not operating normally.

For this reason, the vehicle diagnosis apparatus 2 determines the predetermined value from the actual measurement value of each state value acquired from each vehicle, as indicated by the solid line in the figure (C) at the time b in the abnormal change period shown in the figure (A). A normal distribution of values obtained by subtracting the value of (T = b normal distribution in the abnormal change period) is generated.

Here, the predetermined value to be subtracted from the actual measurement value of each state value is a value obtained by subtracting the ideal value of the state value from the state value at time b in FIG. And the vehicle diagnostic apparatus 2 sets the range of +/- 3 (sigma) from the average value (peak) of the normal distribution shown as a continuous line to the figure (C) as a normal range of a state value.

In addition, when the vehicle diagnostic apparatus 2 generates a normal distribution of state values whose values decrease with the passage of time, a predetermined value is set with respect to the actual measurement value of each state value acquired from each vehicle during the abnormal change period. Generate a normal distribution of the added values. The predetermined value in such a case is a value obtained by subtracting the state value of the vehicle-mounted device that is expected to be acquired at the same time based on the information on the secular change of the state value from the ideal value of the state value at the time of generating the normal distribution. .

As described above, the vehicle diagnosis apparatus 2 generates a normal distribution of state values for each year in consideration of the secular change of the state values, and sets the normal range of the state values based on the generated normal distribution. For this reason, the vehicle diagnosis apparatus 2 can accurately diagnose the vehicle even when it is a time when the vehicle-mounted device does not normally operate in most vehicles.

3, the probe information extraction unit 233 is a processing unit that extracts probe information in units of vehicles from the probe history 221 and outputs the probe information to the diagnosis unit 234. Here, when a predetermined number of state values are accumulated in the probe history 221 for each vehicle, the probe information extraction unit 233 extracts the accumulated predetermined number of state values for each vehicle.

Note that the probe information extraction unit 233 may acquire the probe information when a predetermined period (for example, one month) has elapsed since the previous probe information was extracted for each vehicle. Further, the probe information extraction unit 233 may extract probe information for each vehicle when the vehicle has traveled a predetermined distance (for example, 1000 km) since the previous probe information was extracted.

When the probe information is input from the probe information extraction unit 233, the diagnosis unit 234 reads the determination criterion 222 corresponding to the state value included in the input probe information from the storage unit 22. The diagnosis unit 234 is a processing unit that diagnoses the vehicle by comparing the state value included in the input probe information with the read determination criterion 222.

For example, when the probe information regarding the fuel / air is input from the probe information extraction unit 233, the diagnosis unit 234 determines whether the fuel / air included in the input probe information is included in the normal range α. .

If the fuel / air is included in the normal range α, the diagnosis unit 234 sets the operating state of the actuator 16 that controls the fuel / air to be normal, and if the fuel / air is included in the abnormal range β, the diagnosis unit 234 returns to the abnormal / predictive range γ. If it is included, it is determined that there is a sign of abnormal operation.

Further, when the state value is included in the abnormal range β as a result of the diagnosis, the diagnosis unit 234 updates the probe history 221 by deleting the state value included in the abnormal range β from the probe history 221. Thereby, in the probe history 221, the number of abnormal state values decreases each time the update is repeated, and the ratio of normal state values to the whole increases.

In the vehicle diagnostic apparatus 2, as described above, the normal distribution generation unit 231 periodically reads the probe information from the sequentially updated probe history 221 to generate a normal distribution, and the determination criterion setting unit 232 newly generates the normal distribution. The criterion 222 is updated periodically using the normal distribution.

Therefore, the reliability of the determination criterion 222 is improved every time it is updated. For this reason, the vehicle diagnostic apparatus 2 improves the diagnostic accuracy of the vehicle every time the determination criterion 222 is updated.

Further, the diagnosis unit 234 outputs a diagnosis result to the diagnosis result transmission unit 235 when a vehicle abnormality or a sign of abnormality is detected by the diagnosis. Then, when a diagnosis result is input from the diagnosis unit 234, the diagnosis result transmission unit 235 transmits the diagnosis result to the in-vehicle device 1 via the communication unit 21.

Next, processing executed by the in-vehicle device 1 will be described with reference to FIG. Here, processing related to vehicle diagnosis will be described, and description of other processing will be omitted.

As shown in FIG. 7, the control unit 14 (hereinafter simply referred to as “control unit 14”) of the in-vehicle device 1 acquires vehicle information from each sensor 15 and stores it in the storage unit 13 when the engine is started (step S101). ). Subsequently, the control unit 14 determines whether or not the state value, which is an actual measurement value of the acquired vehicle information, is different from the specified value (step S102).

If the control unit 14 determines that the actually measured value is different from the specified value (step S102, Yes), the control unit 14 corrects and controls the operation of the corresponding actuator 16 so that the actually measured value approaches the specified value (step S103). ), And the process proceeds to step S104.

On the other hand, if the control unit 14 determines that the actual measurement value matches the specified value (No in step S102), the control unit 14 moves the process to step S104 and determines whether it is the probe information transmission timing.

And the control part 14 moves a process to step S101, when it determines with it not being the transmission timing of probe information (step S104, No). On the other hand, when it determines with it being a transmission timing (step S104, Yes), the control part 14 uses a part of vehicle information predetermined among the vehicle information memorize | stored in the memory | storage part 13 as probe information, and a vehicle diagnostic apparatus. 2 (step S105).

Subsequently, the control unit 14 determines whether or not a diagnosis result has been received from the vehicle diagnostic apparatus 2 (step S106). When it is determined that the diagnosis result has been received (step S106, Yes), the diagnosis result is displayed on the display unit 12. (Step S107).

Thereafter, the control unit 14 transmits all untransmitted probe information among the probe information related to the reception result to the vehicle diagnostic apparatus 2 (step S108), and ends the process. In addition, the control part 14 performs the process of step S108 in the period when the vehicle has stopped.

On the other hand, when it determines with the control part 14 not receiving the diagnostic result from the vehicle diagnostic apparatus 2 (step S106, No), a process is complete | finished. Then, the control unit 14 repeatedly executes the process shown in FIG. 7 while the engine is started.

Next, processing executed by the vehicle diagnostic apparatus 2 will be described with reference to FIGS. 8 and 9. Here, processing related to vehicle diagnosis will be described, and description of other processing will be omitted.

As shown in FIG. 8, the control unit 23 of the vehicle diagnostic device 2 (hereinafter simply referred to as “control unit 23”) obtains probe information from the probe history 221 in units of vehicles when the vehicle diagnostic device 2 is powered on. Extract (step S201).

Subsequently, the control unit 23 reads the determination criterion 222 from the storage unit 22 (step S202), and compares the determination criterion 222 with the probe information extracted from the probe history 221 to determine whether there is an abnormality in the vehicle. (Step S203).

If the control unit 23 determines that the vehicle is abnormal (step S203, Yes), it deletes the probe information that is the basis for determining that there is an abnormality from the probe history 221 (step S204), and the process proceeds to step S205. Move to.

On the other hand, when it is determined in step S203 that there is no abnormality in the vehicle (No in step S203), the control unit 23 determines whether or not there is a sign of abnormality in the vehicle (step S206). Then, when it is determined that there is no sign of abnormality (No in step S206), the control unit 23 ends the process.

On the other hand, if it is determined that there is a sign of abnormality in the vehicle (step S204, Yes), the control unit 23 moves the process to step S205, transmits the diagnosis result to the in-vehicle device 1, and then ends the process.

And the control part 23 repeatedly performs the process shown in FIG. 8, while the power supply to the vehicle diagnostic apparatus 2 is turned on. Moreover, the control part 23 performs the process shown in FIG. 9 regularly in parallel with the process shown in FIG.

That is, as shown in FIG. 9, when the predetermined timing comes, the control unit 23 reads the probe history 221 (step S301) and generates a normal distribution (step S302). Subsequently, the control unit 23 sets the determination criterion 222 based on the normal distribution generated in step S302 (step S303), and ends the process.

As described above, in the vehicle diagnosis system according to the present embodiment, the vehicle diagnosis device performs a vehicle diagnosis using the state value included in the vehicle information received from the in-vehicle device by wireless communication. For this reason, according to the vehicle diagnosis system according to the present embodiment, the vehicle can be diagnosed without having the vehicle enter the maintenance factory.

Further, in the vehicle diagnostic system according to the present embodiment, the vehicle diagnostic device transmits a diagnostic result to the in-vehicle device when an abnormality is detected in the vehicle or a sign of abnormality is detected as a result of the diagnosis. For this reason, when receiving a notification that an abnormality or a sign of abnormality has occurred in the vehicle, the vehicle user can promptly request the vehicle dealer to repair the vehicle. Therefore, the safety of the vehicle can be improved.

In the vehicle diagnosis system according to the present embodiment, when a vehicle abnormality is detected, the vehicle dealer prompts the user of the vehicle to inspect and maintain the vehicle before the vehicle abnormality occurs. Safety can be improved.

In addition, according to the vehicle diagnosis system according to the present embodiment, the vehicle dealer can detect the vehicle abnormality between the time when the vehicle abnormality or a sign of abnormality is detected and the time when the vehicle enters the dealer maintenance shop. Preparations can be made to resolve.

For example, if a dealer needs to replace a part to resolve the problem, the dealer will procure the necessary part in advance and immediately respond to the problem with the vehicle without waiting for the user of the vehicle when the vehicle enters the maintenance shop. Therefore, the service for the vehicle user can be improved.

In the vehicle diagnosis system according to the present embodiment, the vehicle diagnosis apparatus sequentially deletes the state values determined to be abnormal from the probe history, and sequentially uses the determination criteria used for vehicle diagnosis using the state values determined to be normal. Update.

For this reason, according to the vehicle diagnosis system according to the present embodiment, the reliability of the determination criterion can be improved every time the determination criterion is updated, so that the diagnosis accuracy of the vehicle is improved with the update of the determination criterion. Can do.

Further, in the vehicle diagnostic system according to the present embodiment, the in-vehicle device periodically sends a part of all the state values acquired from the vehicle to the vehicle diagnostic device until a sign of abnormality is detected in the vehicle. Since it transmits, it can suppress that the processing load and communication cost of a communication process increase.

In addition, in the vehicle diagnostic system according to the present embodiment, the in-vehicle device transmits all untransmitted state values related to the sign to the vehicle diagnostic device when a sign of abnormality is detected in the vehicle. For this reason, the vehicle diagnosis apparatus can perform a detailed diagnosis using all the state values related to the abnormality sign received from the in-vehicle apparatus.

Further, in this embodiment, the vehicle diagnostic device transmits a diagnostic result to the in-vehicle device when detecting a sign of abnormality in the vehicle by the diagnosis, but the diagnosis result is determined according to the state value received from the in-vehicle device. The transmission time may be changed. Here, with reference to FIG. 10, an example of a case where the vehicle diagnosis apparatus changes the transmission timing of the diagnosis result according to the state value received from the in-vehicle apparatus will be described.

When changing the transmission timing of the diagnosis result according to the state value received from the in-vehicle device, the vehicle diagnostic device divides the predictive range γ into a plurality of ranges as shown in FIG. Thereby, the vehicle diagnostic apparatus can predict the period until the abnormality occurs and the travel distance depending on which range the state value received from the in-vehicle apparatus is included in the divided sign range γ.

For this reason, as shown in the figure, for example, when the state value received from the in-vehicle device is included in the range a to a1 that is closest to the abnormal range β in the predictive range γ, the vehicle diagnostic device The diagnosis result is transmitted to the in-vehicle device. Note that a and b shown in the figure are the same as the values shown in FIGS. 4 and 5.

In addition, when the state value received from the in-vehicle device is included in the central range a1 to a2 in the predictive range γ, the vehicle diagnosis device transmits the diagnosis result after three months, and the state value is the most within the normal range α. If it is within the range of a2 to b, the diagnosis result is sent after 6 months.

Thus, by changing the transmission timing of the diagnosis result according to the state value received from the in-vehicle device, it is possible to prevent unnecessary transmission of the diagnosis result from the vehicle diagnosis device to the in-vehicle device. For example, when a period from when a sign of abnormality is detected to when the abnormality occurs is relatively long, a user of the vehicle may cause the vehicle to be stored in a maintenance factory before the abnormality occurs.

In such a case, the vehicle diagnosis apparatus can prevent unnecessary transmission of the diagnosis result to the in-vehicle apparatus by changing the transmission timing of the diagnosis result according to the state value received from the in-vehicle apparatus. Note that the vehicle diagnosis apparatus may determine the transmission timing of the diagnosis result according to the travel distance traveled by the vehicle after detecting a sign of abnormality.

Further, in the present embodiment, the case where the vehicle is moved into the maintenance factory and the abnormality that has occurred in the vehicle has been described has been described. However, when the abnormality of the vehicle can be resolved by changing the software, the vehicle diagnosis device You may transmit the software for abnormality elimination to a vehicle-mounted apparatus.

In this case, the vehicle diagnostic apparatus stores abnormality elimination software in the storage unit, and transmits the abnormality elimination software as appropriate to the in-vehicle device of the vehicle that has detected the abnormality. Then, the in-vehicle device eliminates the abnormality by installing the abnormality eliminating software received from the vehicle diagnostic device.

Further, in this embodiment, when the vehicle diagnostic device detects a sign of abnormality in the vehicle, all the untransmitted status values related to the sign of abnormality are transmitted from the in-vehicle device to the vehicle diagnostic device. Transmission of the state value by wireless communication is not essential.

For example, an untransmitted status value may be transmitted from the in-vehicle device to the vehicle diagnostic device by wired communication when the vehicle is stored in the maintenance shop. Thereby, the vehicle-mounted apparatus can reduce the communication cost required for transmitting the state value.

In addition, the specified value stored in the vehicle-mounted device in the present embodiment is also stored in the vehicle diagnostic device, and when the determination criterion is set by the vehicle diagnostic device, the determination criterion is corrected using the specified value. A vehicle diagnostic apparatus may be configured.

For example, when the vehicle diagnostic device generates a normal distribution of state values read from the probe history, and there is a difference between the average value of the normal distribution and the specified value, the vehicle diagnostic device has a normal range set based on the normal distribution. Correct so that the center approaches the specified value.

As a result, the vehicular diagnostic device can provide a reliable normal range centered on the specified value by bringing the center of the normal range closer to the specified value even if most of the state values received from the in-vehicle device are abnormal values. Can be set.

In the present embodiment, the normal distribution is used to set the determination criterion. However, the distribution used for setting the determination criterion is not limited to the normal distribution, and may be any distribution as long as it shows a variation in state values. Can be used.

DESCRIPTION OF SYMBOLS S Vehicle diagnostic system 1 In-vehicle apparatus 11 Communication part 12 Display part 13 Memory | storage part 131 Vehicle information 132 Specified value 14 Control part 141 Information acquisition part 142 Correction | amendment part 143 Probe information transmission part 144 Diagnostic result notification part 15 Sensor 16 Actuator 2 Vehicle diagnostic apparatus 21 Communication Unit 22 Storage Unit 221 Probe History 222 Judgment Criteria 23 Control Unit 231 Normal Distribution Generation Unit 232 Judgment Criteria Setting Unit 233 Probe Information Extraction Unit 234 Diagnosis Unit 235 Diagnosis Result Transmission Unit

Claims

A vehicle diagnostic system including a vehicle diagnostic device for diagnosing the vehicle based on a state value indicating an operation state of the vehicle-mounted device acquired by the vehicle,
The vehicle is
Transmitting means for transmitting the state value of the vehicle-mounted device to the vehicle diagnostic device by wireless communication,
The vehicle diagnostic device comprises:
Receiving means for receiving the state value of the vehicle-mounted device from the vehicle by wireless communication;
Transmission of the state value by determining whether or not the state value received by the receiving means is included in a normal range in the distribution of the state value acquired by the vehicle during normal operation of the vehicle-mounted device. A vehicle diagnostic system comprising: diagnostic means for diagnosing the original vehicle.
The vehicle diagnostic device comprises:
Predictive range setting for setting a first predetermined range constituting a boundary portion for determining whether or not it is included in the normal range as a predictive range that is a determination criterion as to whether or not the vehicle has an abnormal sign Means,
A sign diagnosis means for diagnosing a sign of abnormality in the vehicle that is a transmission source of the state value by determining whether or not the state value received by the receiving means is included in the sign range; The vehicle diagnostic system according to claim 1, further comprising:
The vehicle diagnostic device comprises:
Storage means for storing the state values received from the plurality of vehicles by the receiving means;
Distribution generating means for generating a distribution indicating variations in the state values stored in the storage means;
2. A normal range setting unit that sets, as the normal range, a second predetermined range centered on an average value of the state values in the distribution generated by the distribution generation unit. The vehicle diagnostic system described in 1.
The vehicle diagnostic device comprises:
A diagnostic result transmitting means for transmitting a diagnostic result by the sign diagnostic means to the vehicle when a sign of abnormality is detected in the vehicle by the sign diagnostic means;
The transmission means of the vehicle is
When a part of all the obtained state values is transmitted to the vehicle diagnostic apparatus until the diagnostic result is received from the vehicle diagnostic apparatus, the diagnostic result is related to the diagnostic result. The vehicle diagnostic system according to claim 2, wherein the untransmitted state value is transmitted to the vehicle diagnostic apparatus.
The vehicle is
A specified value storage means for storing a specified value specified in advance for each type of the state value;
When there is a difference between the state value acquired from the on-vehicle device and the specified value, the correction unit further includes a correction unit that corrects and controls the operation of the on-vehicle device so that the state value approaches the specified value. The vehicle diagnostic system according to claim 1.
A vehicle diagnostic apparatus for diagnosing the vehicle based on a state value indicating an operation state of the vehicle-mounted device acquired by the vehicle,
Receiving means for receiving the state value of the vehicle-mounted device from the vehicle by wireless communication;
Transmission of the state value by determining whether or not the state value received by the receiving means is included in a normal range in the distribution of the state value acquired by the vehicle during normal operation of the vehicle-mounted device. A vehicle diagnostic apparatus comprising: diagnostic means for diagnosing the original vehicle.
A vehicle diagnostic method by a vehicle diagnostic apparatus for diagnosing the vehicle based on a state value indicating an operation state of the vehicle-mounted device acquired by the vehicle,
A receiving step of receiving the state value of the in-vehicle device from the vehicle by wireless communication;
Transmission of the state value by determining whether or not the state value received by the receiving step is included in a normal range in the distribution of the state value acquired by the vehicle during normal operation of the vehicle-mounted device. A vehicle diagnosis method comprising: a diagnosis step of diagnosing the vehicle that is the original.