JP2019196920A - Diagnostic device - Google Patents

Abstract

To make a precise diagnosis of a sign of abnormalities in an apparatus equipped in a vehicle.SOLUTION: A diagnostic device 10 includes: a detected-value acquisition unit 110 for acquiring the detected value of a first apparatus 30 equipped in first vehicles 1-2 and 1-3; an appropriate-value estimation unit 120 for estimating an appropriate value of the detected value of the second apparatus 30 in a second vehicle 1-1, using the detected value of the first apparatus 30; and a diagnosis unit 130 for comparing the detected value of the second apparatus 30 and the appropriate value of the detected value of the second apparatus 30 and diagnosing the operational state of the second apparatus 30. The first vehicles 1-2 and 1-3 are located within a predetermined range from the second vehicle 1-1, and the predetermined range is set according to the speed of the second vehicle 1-1 when moving.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a diagnostic apparatus for diagnosing an abnormality sign of a sensor mounted on a vehicle.

  In recent years, techniques for diagnosing abnormal signs of equipment have been developed. For example, Patent Document 1 discloses an abnormality predictor based on the degree of deviation (abnormality) from a case model created using sensor data when machine equipment is operating normally as learning data. First diagnostic means for diagnosing the presence or absence, and second diagnostic means for diagnosing the presence or absence of an abnormality sign based on whether or not the value of the individual sensor data is within a predetermined range, When the first diagnostic means diagnoses that there is an abnormal sign, the individual sensor data to be referred to for the abnormal sign diagnosis by the second diagnostic means is selected based on the contribution indicating the degree of contribution to the degree of abnormality An abnormality predictor diagnosis device is disclosed.

JP2013-008111A

  The technique described in Patent Document 1 requires data when a diagnosis target device is operating normally. However, the value at the time of normal operation of the device mounted on the vehicle may vary depending on the external environment such as the road surface shape, road gradient, and weather. It is difficult to prepare all data during normal operation under various external environment conditions, and it is not always easy to obtain a highly accurate diagnosis result by the technique of Patent Document 1.

  An object of the present invention made in view of such circumstances is to provide a diagnostic apparatus capable of accurately diagnosing an abnormality sign of a device mounted on a vehicle.

A diagnostic apparatus according to an embodiment of the present invention includes:
A detection value acquisition unit for acquiring a detection value of the first device mounted on the first vehicle;
A reasonable value estimating unit for estimating a reasonable value of the detected value of the second device mounted on the second vehicle, using the detected value of the first device;
A diagnostic unit for diagnosing the operating state of the second device by comparing the detection value of the second device and the reasonable value of the detection value of the second device;
The first vehicle is a vehicle existing within a predetermined range from the second vehicle, and the predetermined range is set according to a moving speed of the second vehicle.

  According to the diagnostic apparatus according to an embodiment of the present invention, it is possible to accurately diagnose an abnormality sign of a device mounted on a vehicle.

It is a figure showing a schematic structure of vehicles provided with a diagnostic device concerning one embodiment of the present invention. It is a figure which shows the vehicle of the comparison object in one Embodiment of this invention. It is a flowchart which shows an example of the procedure of the diagnostic method using the diagnostic apparatus which concerns on one Embodiment of this invention. It is a figure which shows the structural example of the diagnostic apparatus which concerns on one Embodiment of this invention. It is a figure explaining the example of a diagnosis by the diagnostic apparatus which concerns on one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram illustrating a schematic configuration of a vehicle including a diagnostic device according to an embodiment of the present invention. Each vehicle 1 includes a diagnostic device 10, an ECU (Electronic Control Unit) 20, a device 30, an inter-vehicle communication unit 40, a display unit 50, and a distance information acquisition unit 60. For convenience of explanation, FIG. 1 shows only three vehicles 1-1, 1-2, and 1-3 having the same configuration, and in this embodiment, the vehicle 1-1 is the own vehicle (second vehicle). The vehicle 1-2 and the vehicle 1-3 will be described as peripheral vehicles (first vehicle) that are traveling within a range in which vehicle-to-vehicle communication with the vehicle 1-1 is possible.

  Since the sensor deteriorates with age, the detection value of the sensor may gradually deviate from the normal value, and in this case, the control value of the actuator based on the detection value of the sensor also deviates from the normal value. Therefore, in the present invention, the sensor detection value or the actuator control value is monitored to diagnose the sensor.

The device 30 is a sensor or an actuator, and the detection value of the device 30 means a detection value (sensor value) of the sensor or a control value of the actuator. Hereinafter, the device 30 will be described as the sensor 30 in the embodiment of the present specification. Various sensors 30 such as an outside air temperature sensor, an intake air temperature sensor, a water temperature sensor, a vehicle speed sensor, an O ₂ sensor, a steering sensor, an air pressure sensor, an ultrasonic sensor, a gyro sensor, and an obstacle sensor are mounted on the vehicle 1. . The detection value of the sensor 30 is output to the ECU 20 that performs processing using the detection value.

A plurality of ECUs 20 are mounted on the vehicle 1 and electronically control various operations of the vehicle 1. For example, the engine ECU ₂₀ controls the fuel injection amount and injection time of the engine by driving the actuator based on information from each sensor 30 such as an intake air temperature sensor, a water temperature sensor, a vehicle speed sensor, and an O ₂ sensor.

  The vehicle-to-vehicle communication unit 40 performs direct communication (vehicle-to-vehicle communication) between the vehicles 1 using radio waves in a pre-assigned frequency band, and surrounding vehicles 1-2 existing within a predetermined range from the host vehicle 1-1. , 1-3 receives the detection information of the sensor 30 (first device) mounted on the surrounding vehicles 1-2, 1-3, and demodulates it. The inter-vehicle communication unit 40 modulates detection information of the sensor 30 (second device) mounted on the host vehicle 1-1 and transmits the modulated information to the surrounding vehicles 1-2 and 1-3. The vehicle-to-vehicle communication unit 40 can communicate with a vehicle that is within the reach of radio waves, and the range of radio waves can be adjusted as appropriate by adjusting the radio field intensity. The inter-vehicle communication unit 40 outputs the received detection information to the diagnostic device 10. Note that the frequency at which the vehicle-to-vehicle communication unit 40 transmits and receives the detection information is arbitrary, but in order to prevent communication with the same vehicle many times, a predetermined period of time is established when communication with the same vehicle is performed once. Communication may not be performed until the time has elapsed.

  Based on the detection information received by the inter-vehicle communication unit 40 by inter-vehicle communication, the diagnostic device 10 determines whether there is a sign of abnormality such as a failure in the sensor 30 mounted on the host vehicle 1-1.

  The display unit 50 is, for example, a panel display or a head-up display, and displays a diagnosis result or the like by the diagnosis device 10.

  The distance information acquisition unit 60 acquires the distance between the vehicles. The distance between the vehicles can be obtained by any method. For example, position information obtained by GPS (Global Positioning System) may be included in the detection information, and the distance information acquisition unit 60 may obtain the distance between the vehicles based on the position information. Or the distance information acquisition part 60 may obtain | require the distance between vehicles based on the electromagnetic wave intensity in vehicle-to-vehicle communication.

  Here, the comparison target vehicle used for diagnosis by the diagnosis device 10 in the present embodiment is a surrounding vehicle existing within a predetermined range from the host vehicle 1-1. In the present embodiment, the diagnostic device 10 sets the predetermined range according to the moving speed of the host vehicle 1-1. The diagnostic device 10 acquires information on the moving speed of the host vehicle 1-1 from the vehicle speed sensor of the host vehicle 1-1.

  FIG. 2 shows an example of the predetermined range. FIG. 2A shows a case where the speed of the host vehicle 1-1 is less than the first predetermined speed, that is, a low speed. On the other hand, FIG. 2B shows a case where the moving speed of the host vehicle 1-1 is equal to or higher than a second predetermined speed (here, second predetermined speed> first predetermined speed), that is, a high speed. In each of FIGS. 2A and 2B, the predetermined range is a region indicated by a region R1 and a region R2. The region R1 and the region R2 are circular regions having a radius D1 and a radius D2 around the host vehicle 1-1, respectively. Here, D1> D2, and the predetermined range in FIG. 2 (a) is wider than the predetermined range in FIG. 2 (b). That is, in the present embodiment, when the moving speed of the host vehicle 1-1 is low, the predetermined range is set wider than when the moving speed is high. In other words, in the present embodiment, when the moving speed of the host vehicle 1-1 increases from a low speed to a high speed, the predetermined range is changed to be narrow.

  Furthermore, the diagnostic device 10 may limit the comparison-target peripheral vehicles used for diagnosis according to the moving direction of the host vehicle 1-1. For example, when the moving speed of the host vehicle 1-1 is equal to or higher than the second predetermined speed, only detection information from a vehicle that moves in substantially the same direction as the host vehicle 1-1 is obtained according to the moving direction of the host vehicle 1-1. You may make it use. Here, the moving direction of the surrounding vehicle can be appropriately determined based on the traveling direction, the information obtained by the distance information acquisition unit 60, the change rate of the relative distance, and the like. In the present embodiment, a case will be described in which the comparison-target peripheral vehicles used for diagnosis are limited according to the moving direction of the host vehicle 1-1.

  In FIG. 2A, the surrounding vehicles 1-2 to 1-6 exist in the region R1. That is, in this case, the detection information of the vehicles 1-2 to 1-6 is used in diagnosis. Detection information of the vehicle 1-7 that does not exist in the region R1 is not used in the diagnosis.

  On the other hand, in FIG.2 (b), the surrounding vehicle 1-3 and the surrounding vehicle 1-5 exist in area | region R2. Here, the moving direction of the surrounding vehicle 1-3 is substantially the same direction as the own vehicle 1-1, and the moving direction of the surrounding vehicle 1-5 is the opposite direction to the own vehicle 1-1. In this case, the detection information related to the surrounding vehicle 1-3 is used in the diagnosis, and the detection information of the surrounding vehicle 1-5 is not used in the diagnosis. That is, the detection information of the surrounding vehicle 1-5 and the vehicles 1-2, 1-4, 1-6, and 1-7 is not used in diagnosis.

  The processing contents of the diagnostic device 10 will be described in more detail with reference to FIGS. 4 and 5 after an overview is described with reference to FIG. FIG. 3 is a flowchart illustrating an example of a procedure of a diagnostic method using the diagnostic device 10. Here, it is assumed that the surrounding vehicles 1-2 and 1-3 exist within a predetermined range of the host vehicle 1-1.

  First, the diagnostic apparatus 10 sets the above-described predetermined range according to the moving speed of the host vehicle 1-1 (step S10). The diagnostic apparatus 10 acquires the detection value of the sensor 30 mounted on the surrounding vehicles 1-2 and 1-3 from the detection information obtained by the vehicle-to-vehicle communication (step S11). Next, the diagnostic device 10 estimates a reasonable value of the detected value (hereinafter simply referred to as “valid value”) from the detected values of the surrounding vehicles 1-2 and 1-3 (step S12). And the diagnostic apparatus 10 compares the detected value of the own vehicle 1-1, and the estimated reasonable value (step S13), and when both are deviating (step S13-Yes), the own vehicle 1-1 is set. It is determined that there is an abnormal sign of the mounted sensor 30 (step S14), and when both are not separated (step S13-No), it is determined that there is no abnormal sign of the sensor 30 mounted on the host vehicle 1-1. (Step S15).

  FIG. 4 is a diagram illustrating a configuration example of the diagnostic apparatus 10. 4 includes a detection value acquisition unit 110, a reasonable value estimation unit 120, a diagnosis unit 130, and a storage unit 140.

  The detection value acquisition unit 110 performs the process of step S11. That is, the detection value acquisition unit 110 instructs the inter-vehicle communication unit 40 to receive the detection information of the surrounding vehicles 1-2 and 1-3 by inter-vehicle communication. Further, the detection value acquisition unit 110 acquires the distance between the surrounding vehicles 1-2 and 1-3 from the distance information acquisition unit 60, and the surrounding vehicles 1-2 and 1-3 are within a predetermined range. Check if it exists. If detection information is received from a vehicle outside the predetermined range, the detection value acquisition unit 110 discards the detection information. Instead of discarding the detection information, the detection value acquisition unit 110 may not receive the detection information from the vehicle outside the predetermined range by adjusting the radio wave intensity of the inter-vehicle communication unit 40. The detection value acquisition unit 110 acquires the detection values of the sensors 30 mounted on the surrounding vehicles 1-2 and 1-3 from the detection information of the surrounding vehicles 1-2 and 1-3 received by the inter-vehicle communication unit 40. The acquired detection value is output to the storage unit 140.

The reasonable value estimation unit 120 performs the process of step S12. That is, the valid value estimation unit 120 estimates a valid value based on the detected value stored in the storage unit 140 and outputs the estimated valid value to the diagnosis unit 130. For example, the reasonable value estimation unit 120 is a sensor mounted on the host vehicle 1-1 with an average value of the detection value x ₁ acquired from the surrounding vehicle 1-2 and the detection value x ₂ acquired from the surrounding vehicle 1-3. A reasonable value x ^ of 30 is assumed.

  The diagnosis unit 130 performs the processes in steps S13 to S15. That is, the diagnosis unit 130 compares the detected value of the host vehicle 1-1 with the appropriate value x ^ input from the appropriate value estimation unit 120 for each sensor 30, and the difference between the two exceeds a preset threshold value ( When the detection value of the own vehicle 1-1 deviates from the appropriate value x ^), it is determined that there is an abnormal sign of the sensor 30, and when the difference between the two is equal to or less than the threshold value (of the own vehicle 1-1) If the detected value does not deviate from the appropriate value x ^), it is determined that there is no abnormal sign of the sensor 30. The diagnosis unit 130 outputs the diagnosis result to the display unit 50, a speaker, or an external server. When the diagnosis unit 130 determines that there is an abnormality sign of the sensor 30 of the host vehicle 1-1, the diagnosis unit 130 may not transmit the detection information of the sensor 30 to the surrounding vehicles 1-2 and 1-3.

  FIG. 5 is a diagram for explaining a specific example of the diagnosis of the detected value by the diagnostic device 10. Here, the detection value of the outside air temperature sensor 30 is diagnosed, the detection value of the outside air temperature sensor 30 of the own vehicle 1-1 is set to “15 ° C.”, and the detection value of the outside air temperature sensor 30 of the surrounding vehicle 1-2 is set. “22 ° C.” is set, and the detected value of the outside air temperature sensor 30 of the surrounding vehicle 1-3 is set to “26 ° C.”.

  The detection value acquisition unit 110 of the own vehicle 1-1 acquires the detection value “22 ° C.” of the outside air temperature sensor 30 of the surrounding vehicle 1-2 by inter-vehicle communication with the surrounding vehicle 1-2. 3, the detected value “26 ° C.” of the outside air temperature sensor 30 of the surrounding vehicle 1-3 is acquired.

  The reasonable value estimation unit 120 of the host vehicle 1-1 determines the reasonable value of the outside air temperature sensor 30 as “24 ° C.” that is an average value of “22 ° C.” and “26 ° C.”. The diagnosis unit 130 of the own vehicle 1-1 compares the reasonable value “24 ° C.” of the outside air temperature sensor 30 with the detected value “15 ° C.” of the outside air temperature sensor 30 of the own vehicle 1-1. Since it is “9 ° C.”, for example, when the threshold is “5 ° C.”, it is determined that there is a sign of abnormality in the outside air temperature sensor 30.

  As described above, the diagnostic apparatus 10 according to the present embodiment acquires the detection values of the surrounding vehicles, and uses the acquired detection values to estimate the appropriate value of the detection value of the sensor 30 mounted on the host vehicle 1-1. To do. And the operation state of the sensor 30 mounted in the own vehicle 1-1 is diagnosed by comparing the detection value and appropriate value of the own vehicle. The target used by the diagnostic device 10 for diagnosis is a surrounding vehicle that exists in a predetermined range from the host vehicle 1-1, and the predetermined range is set according to the moving speed of the host vehicle 1-1. It can be said that the predetermined range is a range in which the current driving environment and driving conditions of the host vehicle are handled with substantially the same environment and driving conditions. By setting the predetermined range according to the moving speed, it is possible to reduce the false detection rate and obtain a highly accurate diagnosis result. Furthermore, when the moving speed of the host vehicle 1-1 is equal to or higher than the second predetermined speed, detection information from a surrounding vehicle that moves in the same direction as the host vehicle 1-1 according to the moving direction of the host vehicle 1-1. You may make it use only. In this case, diagnosis can be performed using only the detection information of surrounding vehicles that are assumed to be more approximate in environment and driving conditions, so that a more accurate diagnosis result can be obtained.

  In addition, in FIG. 2, although the predetermined range in the two patterns when the speed of the host vehicle 1-1 is low speed and high speed is illustrated, the setting of the predetermined range is set in multiple stages according to the speed. can do. For example, when the speed of the host vehicle 1-1 is equal to or higher than the first predetermined speed and lower than the second predetermined speed, that is, when it is a medium speed, the predetermined range is larger than the area R1 and larger than the area R2. May be a small range. Further, a predetermined range may be set continuously according to the speed. For example, when the predetermined range is a circular area having a predetermined radius centered on the own vehicle 1-1, the predetermined radius may be reduced as the speed of the own vehicle 1-1 increases.

  In addition, it is also possible to use a computer in order to function as the diagnostic apparatus 10 according to the present invention. Such a computer is realized by storing a program describing processing contents for realizing each function of the diagnostic apparatus 10 in a storage unit of the computer, and reading and executing the program by the CPU of the computer. Can do.

  The program may be recorded on a computer readable medium. If a computer-readable medium is used, it can be installed on a computer. Here, the computer-readable medium on which the program is recorded may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, but may be a recording medium such as a CD-ROM or a DVD-ROM.

  Although the above embodiment has been described as a representative example, it will be apparent to those skilled in the art that many changes and substitutions can be made within the spirit and scope of the invention. Therefore, the present invention should not be construed as being limited by the above-described embodiments, and various modifications and changes can be made without departing from the scope of the claims. For example, a plurality of constituent blocks or steps described in the configuration diagram of the embodiment can be combined into one, or one constituent block or step can be divided.

1 vehicle 10 diagnostic device 20 ECU
30 equipment 40 vehicle-to-vehicle communication unit 50 display unit 60 distance information acquisition unit 110 detection value acquisition unit 120 reasonable value estimation unit 130 diagnosis unit 140 storage unit R1, R2 region D1, D2 radius

Claims (1)

A detection value acquisition unit for acquiring a detection value of the first device mounted on the first vehicle;
A reasonable value estimating unit for estimating a reasonable value of the detected value of the second device mounted on the second vehicle, using the detected value of the first device;
A diagnostic unit for diagnosing the operating state of the second device by comparing the detection value of the second device and the reasonable value of the detection value of the second device;
The diagnostic apparatus, wherein the first vehicle is a vehicle existing within a predetermined range from the second vehicle, and the predetermined range is set according to a moving speed of the second vehicle.

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