JP2018021524A - Abnormality detection device and abnormality detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect abnormality of a vehicle.SOLUTION: An abnormality detection device 1 includes a data acquiring section 100 for acquiring fuel injection amount data showing a fuel injection amount in a vehicle T for a prescribed time period, a reference value calculating section 110 for calculating a reference value of the fuel injection amount based on the fuel injection amount data acquired by the data acquiring section 100, and a determining section 120 for determining whether abnormality occurs in the vehicle or not by comparing the fuel injection amount data with the reference value.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an abnormality detection device and an abnormality detection method for detecting an abnormality of a vehicle.

  Conventionally, an abnormality detecting means for detecting that an abnormality has occurred in an internal combustion engine has been taken. Patent Document 1 discloses a technique for identifying whether an injector is a valve opening continuation abnormality or a valve closing continuation abnormality when an injection abnormality of the injector is detected by measuring the air-fuel ratio of the exhaust gas. Yes.

JP 2013-170484 A

  However, even if vehicles with the same engine are used, the load on the engine differs depending on the use of the vehicle. Therefore, if a vehicle abnormality is detected using a single abnormality detection criterion, abnormality detection is performed. There was a problem that accuracy was lowered.

  Therefore, the present invention has been made in view of these points, and an object of the present invention is to provide an abnormality detection device that accurately detects an abnormality of a vehicle.

  In the first aspect of the present invention, based on the data acquisition unit that acquires fuel injection amount data indicating the fuel injection amount in the vehicle over a predetermined period, and the fuel injection amount data acquired by the data acquisition unit. A standard value calculation unit that calculates a standard value of the fuel injection amount, and the fuel injection amount data acquired by the data acquisition unit after the standard value calculation unit calculates the standard value are compared with the standard value. By this, the abnormality detection apparatus which has a determination part which determines whether abnormality has generate | occur | produced in the said vehicle is provided.

  For example, the standard value calculation unit calculates the standard value based on the fuel injection amount while the vehicle is in an idle state in the predetermined period.

  The data acquisition unit may acquire the data of the fuel injection amount after a predetermined time has elapsed since the vehicle was operated.

  The standard value calculation unit calculates, for example, an average value or variance of the fuel injection amounts acquired by the data acquisition unit as the standard value.

  The data acquisition unit acquires a correction value of the fuel injection amount, the standard value calculation unit calculates a standard value of the correction value acquired by the data acquisition unit, and the determination unit calculates the standard value. It may be determined whether an abnormality has occurred in the vehicle by comparing the correction value acquired by the data acquisition unit with the standard value after the value calculation unit calculates the standard value.

  The data acquisition unit may acquire the fuel injection amount from a plurality of different vehicles having the same vehicle type. In that case, the standard value calculation unit calculates the standard value based on the fuel injection amount acquired from the plurality of vehicles by the acquisition unit.

  In the second aspect of the present invention, a step of acquiring a fuel injection amount in the vehicle over a predetermined period, a step of calculating a standard value of the fuel injection amount based on the acquired fuel injection amount, A step of determining whether or not an abnormality has occurred in the vehicle by comparing the fuel injection amount acquired after calculating the standard value with the standard value.

  According to the present invention, there is an effect that a vehicle abnormality is accurately detected.

It is a figure which shows the structure of the abnormality notification system of 1st Embodiment. It is a conceptual diagram of the sensor system with which a vehicle is provided. It is a figure which shows the structure of an abnormality detection apparatus. It is a figure which shows the operation | movement flow of an abnormality detection apparatus.

<First Embodiment>
FIG. 1 is a diagram illustrating a configuration of an abnormality detection system S according to the first embodiment. The abnormality detection system S is a system that detects an abnormality of the vehicle and notifies the vehicle owner or driver. The abnormality detection system S includes a plurality of vehicles T, a data collection center C, and a management base station M. The data collection center C is provided with an abnormality detection device 1 that collects information about the vehicle T, detects an abnormality, and notifies the management base station M and the driver of the vehicle T of the detected abnormality.

  The abnormality detection apparatus 1 is connected to a plurality of vehicles T via wireless communication lines, and receives data indicating the operating status of the vehicle T from each vehicle T at a predetermined time interval over a predetermined period. . The data indicating the operating status of the vehicle T includes measurement values acquired by various sensors in a sensor system included in the vehicle T, a fuel injection amount correction value calculated based on the measurement values acquired by the sensors, and an indicated fuel injection amount. . The abnormality detection device 1 detects an abnormality of the vehicle T based on the operation status data of the vehicle T received from the vehicle T. The command fuel injection amount is a target value of the amount of fuel injected into the cylinder, which is calculated by an ECU (Electronic Control Unit) 20 provided in the vehicle T.

  The abnormality detection device 1 is connected to a computer installed in a management base station M that manages the vehicle T via a network (for example, the Internet). The management base station M is a company that owns the vehicle T or a company that maintains the vehicle T, for example. The abnormality detection apparatus 1 notifies the management base station M of the abnormality of the detected vehicle T that needs to be notified. When the staff of the management base station M receives a notification that an abnormality has occurred in the vehicle T from the abnormality detection device 1, it notifies the driver of the vehicle T that an abnormality has occurred in the vehicle T, or By conducting maintenance, serious accidents can be prevented.

[Procedure for determining the fuel injection amount]
FIG. 2 is a conceptual diagram of the sensor system 2 provided in the vehicle T. The sensor system 2 includes a plurality of sensors S <b> 1 to S <b> 5, an ECU 20, a communication unit 21, and a notification device 22. The plurality of sensors S <b> 1 to S <b> 5 are provided in each component constituting the vehicle T. The plurality of sensors S1 to S5 are an air flow rate sensor S1, an acceleration sensor S2, a temperature sensor S3, an oxygen sensor S4, and a pressure sensor S5. The sensor system 2 also has other sensors not shown.

  The air flow rate sensor S1 measures the circulation amount of the exhaust gas in the EGR device. The acceleration sensor S2 detects that the vehicle has accelerated or decelerated. The temperature sensor S3 is, for example, a water temperature sensor or an intake air temperature sensor. The water temperature sensor measures the water temperature of the engine cooling water. The intake air temperature sensor measures the temperature of the intake air. The oxygen sensor S4 measures the air-fuel ratio of the exhaust gas. The pressure sensor S5 measures the common rail pressure.

  The values measured by the sensors S1 to S5 are notified to the ECU 20 connected wirelessly or by wire. In addition to the values measured by the sensors S1 to S5, the ECU 20 is notified of an intake air amount sensor, an engine speed sensor, an air conditioner signal and a power steering signal, an idle contact ON / OFF signal, and the like.

  The ECU 20 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input port, an output port, and the like. The ECU 20 analyzes the acquired data and controls the hardware when the CPU executes a program recorded in the ROM.

  The ECU 20 refers to a table in which the intake air amount, the engine rotational speed, and the basic fuel injection amount are recorded in advance in the ROM, so that the intake air amount and the engine rotational speed measured by the intake air amount sensor. The basic fuel injection amount is determined based on the engine speed measured by the sensor. Further, the ECU 20 refers to a table recorded in advance in the ROM in which the measurement values of the sensors S1 to S5 are associated with the correction value of the fuel injection amount, and corrects the fuel injection amount based on the acquired measurement value of the sensor. Determine the value. The ECU 20 calculates a command fuel injection amount by adding a correction value for the fuel injection amount to the basic fuel injection amount.

  It should be noted that the amount of fuel actually injected from the injector depends on the pressure in the common rail where the fuel is stored and the fuel injection time during which the injector valve opens. The ECU 20 determines the fuel injection time during which the injector valve is opened based on the common rail pressure acquired from the pressure sensor S5 and the commanded fuel injection amount. The ECU 20 instructs the injector to open the valve for the fuel injection time, thereby causing the injector to inject the specified fuel injection amount of fuel.

  Further, the ECU 20 associates the measured value of the sensor notified from each sensor, the correction value of the fuel injection amount determined based on the measured value of the sensor, the basic fuel injection amount, and the commanded fuel injection amount with the time measured by the sensor. Record in the RAM. The ECU 20 records the data indicating the operation status of the vehicle T recorded in the RAM to the abnormality detection device 1 provided in the data collection center C via the communication unit 21 at a predetermined time interval (for example, every 12 minutes for 40 seconds. )

  The abnormality detection device 1 detects an abnormality of the vehicle T based on data indicating the operating status of the vehicle T received from the vehicle T. The abnormality detection device 1 transmits, to the vehicle T, information on the abnormality determined to be notified to the driver of the vehicle T among the detected abnormality of the vehicle T. The ECU 20 of the vehicle T notified of the abnormality information from the abnormality detection device 1 causes the alarm device 22 connected to the ECU 20 to warn. The driver of the vehicle T can grasp the abnormal state of the vehicle T by confirming a warning issued by the alarm 22 such as a warning buzzer or a warning lamp.

[Configuration of Abnormality Detection Device 1]
FIG. 3 is a diagram illustrating a configuration of the abnormality detection apparatus 1. The abnormality detection device 1 includes a storage unit 10, a first communication unit 11, a second communication unit 12, and a control unit 13.

  The storage unit 10 includes, for example, a RAM that functions as a working storage medium, a ROM in which a program executed by the control unit 13 is recorded, and an HDD (Hard Disk Drive) that records data received from the vehicle T. The storage unit 10 stores the product number of the parts used for each vehicle T, the vehicle type of the vehicle T, the driver, the owner name, and the like. Moreover, the memory | storage part 10 has also memorize | stored the various data for the abnormality detection apparatus 1 to detect abnormality of a vehicle. The storage unit 10 stores the details of the abnormality of the vehicle T detected by the abnormality detection device 1, the date and time when the abnormality detection device 1 detected the abnormality, and the history that the abnormality detection device 1 notified to the driver of the vehicle T and the management base station M. You may remember.

  The first communication unit 11 transmits / receives data to / from a plurality of vehicles T via a wireless communication line. The first communication unit 11 receives data indicating the operating status of the vehicle T sent from each of the plurality of vehicles T. The first communication unit 11 notifies the control unit 13 of the received data. Moreover, the 1st communication part 11 transmits the information of the abnormal condition which needs to notify the driver | operator of the vehicle T among the abnormal conditions of the vehicle T which the abnormality detection apparatus 1 detected to the vehicle T.

  For example, the second communication unit 12 transmits data to the management base station M via the Internet line. The second communication unit 12 notifies the management base station M of information on an abnormal state that needs to be notified to the owner of the vehicle T among the abnormal states of the vehicle T detected by the abnormality detection device 1.

  The control unit 13 is, for example, a CPU, and controls various hardware including the first communication unit 11 and the second communication unit 12 by executing a program recorded in the storage unit 10. The control unit 13 also functions as the data acquisition unit 100, the standard value calculation unit 110, the determination unit 120, and the abnormality notification unit 130.

  The data acquisition unit 100 acquires fuel injection amount data indicating the fuel injection amount in the vehicle over a predetermined period. The data acquiring unit 100 acquires the fuel injection amount data at a predetermined time interval (for example, 40 seconds every 12 minutes) for a predetermined period (for example, one day). The fuel injection amount data acquired by the data acquisition unit 100 is added to the basic fuel injection amount and the basic fuel injection amount determined by the ECU 20 based on the intake air amount and the engine speed, in addition to the indicated fuel injection amount calculated by the ECU 20. Correction values to be included.

  The data acquisition unit 100 records various data acquired from the first communication unit 11 in the storage unit 10 in association with the individual number of the vehicle T, and informs the standard value calculation unit 110 that the fuel injection amount data of the vehicle T has been updated. Notice.

  The standard value calculation unit 110 calculates a standard value of the fuel injection amount based on the fuel injection amount data acquired by the data acquisition unit 100. For example, the standard value calculation unit 110 calculates the average value of the fuel injection amounts acquired by the data acquisition unit 100 as the standard value. The average value of the fuel injection amount is obtained as follows. For example, a value obtained by normalizing the integrated value of the indicated fuel injection amount acquired by the data acquisition unit 100 over one day with a predetermined time width (for example, 5 hours) is set as the indicated fuel injection amount for one day. . A value obtained by averaging the commanded fuel injection amount for one day over a predetermined number of days (for example, one week or one month) is determined as the average value of the fuel injection amount for one day.

  Specifically, it is assumed that the data acquisition unit 100 acquires data for 3 hours in total from the vehicle T, and the integrated value of the indicated fuel injection amount for 3 hours is 15 liters. In this case, the indicated fuel injection amount for one day is calculated as 25 liters by normalizing the fuel injection amount of 15 liters for 3 hours to the fuel injection amount for 5 hours. Assuming that the commanded fuel injection amount for one day is calculated for seven days and the integrated value of the commanded fuel injection amount for seven days is 154 liters, the commanded fuel injection amount for one day on average is Since it is 22 liters, the standard value is calculated to be 22 liters / day. Note that the unit of the standard value of the commanded fuel injection amount may not be the injection amount per day. The unit of the standard value of the command fuel injection amount may be an injection amount per hour or an injection amount per 30 minutes.

  Further, the standard value calculation unit 110 may calculate the variance of the fuel injection amount acquired by the data acquisition unit 100 as a standard value. For example, since the ECU 20 determines the command fuel injection amount in units of 1 milliliter per 50 milliseconds, the command fuel injection amount data acquired by the data acquisition unit 100 over one day is It can be changed to fuel injection amount data. The standard value calculation unit 110 can calculate, for example, the variance of the commanded fuel injection amount per 500 milliseconds, the variance of the commanded fuel injection amount per second, or the variance of the commanded fuel injection amount per 10 seconds. The standard value calculation unit 110 can set the dispersion of the indicated fuel injection amount in a desired unit as the standard value of the indicated fuel injection amount.

  For example, the standard value calculation unit 110 calculates the standard value based on the fuel injection amount while the vehicle T is in an idle state in a predetermined period. In other words, the standard value calculation unit 110 calculates the standard value based on the fuel injection amount when the load on the engine is small. Specifically, the standard value calculation unit 110 refers to data in which the command fuel injection amount is associated with the ON / OFF signal of the idle contact, and the command fuel when the idle contact is OFF among the command fuel injection amount. Select the injection amount and calculate the standard value. After calculating the standard value, the standard value calculation unit 110 records the standard value calculated in the storage unit 10 and notifies the determination unit 120 of the standard value.

  The determination unit 120 determines whether or not an abnormality has occurred in the vehicle T by comparing the fuel injection amount data with the standard value. For example, the determination unit 120 may calculate the command fuel injection amount for the most recent day calculated from the command fuel injection amount data acquired by the data acquisition unit 100 and the command fuel injection amount acquired by the data acquisition unit 100 in the past seven days. The commanded fuel injection amount per day calculated from the data is compared.

  The determination unit 120 determines that an abnormality has occurred in the vehicle T when, for example, the commanded fuel injection amount per day is larger than a predetermined value compared to the standard value. Specifically, the determination unit 120 determines that an abnormality has occurred in the vehicle T when the indicated fuel injection amount per day is, for example, 20% or 30% or more larger than the standard value. Alternatively, the determination unit 120 may determine that an abnormality has occurred in the vehicle T when the variance of the indicated fuel injection amount per second is two times or more than the standard value or three times or more. When determining that an abnormality has occurred in the vehicle T, the determination unit 120 notifies the abnormality notification unit 130.

  When the abnormality notification unit 130 is notified from the determination unit 120 that an abnormality has occurred in the vehicle T, for example, based on the degree of deviation between the commanded fuel injection amount and the standard value, the operation of the management base station M or the vehicle T is performed. It is determined whether to notify the person of abnormality. For example, the abnormality notification unit 130 notifies the management base station M of an abnormality of the vehicle T when the indicated fuel injection amount per day is 40% or more larger than the standard value.

[Operation Flow of Abnormality Detection Device 1]
FIG. 4 is a diagram illustrating an operation flow of the abnormality detection device 1. The flowchart of FIG. 4 starts when the data acquisition unit 100 acquires the fuel injection amount data of the vehicle T via the communication unit 11 (S41). The standard value calculation unit 110 calculates the standard value of the fuel injection amount based on the fuel injection amount data acquired by the data acquisition unit 100 (S42). The determination unit 120 determines whether an abnormality has occurred in the vehicle T by comparing the fuel injection amount data with the standard value (S43).

  If the abnormality detection device 1 detects that an abnormality has occurred in the vehicle T (YES in S43), the abnormality detection device 1 notifies the management base station M or the driver of the vehicle T of the abnormality of the vehicle T (S44) and ends the operation. To do. Abnormality detection apparatus 1 ends the operation when it is not detected that an abnormality has occurred in vehicle T (NO in S43).

<Modification 1>
The data acquisition unit 100 may acquire fuel injection amount data after a predetermined time has elapsed since the vehicle was operated. For example, the data acquisition unit 100 may start acquiring the fuel injection amount data after the vehicle is operated and the temperature of the engine cooling water reaches 80 degrees or more. In this case, the commanded fuel injection amount acquired by the data acquisition unit 100 does not include, for example, a post-start-up increase in the fuel injection amount that is increased when the engine is operating. Therefore, the abnormality detection device 1 can detect the abnormality of the vehicle T based on the fuel injection amount in the operating state where the load on the engine is small, and can therefore detect the abnormality with high accuracy.

<Modification 2>
The data acquisition unit 100 may acquire the fuel injection amount from a plurality of different vehicles having the same vehicle type. In that case, the standard value calculation unit 110 calculates a standard value based on the fuel injection amounts acquired by the data acquisition unit 100 from a plurality of vehicles. When the standard value calculation unit 110 calculates the standard value based on the fuel injection amounts acquired from a plurality of vehicles of the same vehicle type, individual differences of the vehicle T are not reflected in the standard value. Therefore, when the standard value calculation unit 110 calculates the standard value based on the fuel injection amounts acquired from the plurality of vehicles, the abnormality detection device 1 compares the average fuel injection amount of the same vehicle type with the fuel of the vehicle T. It becomes easy to determine whether or not the injection amount has a unique behavior, and it becomes easy to detect an abnormality of the vehicle T.

[Effects of the abnormality detection device 1 of the first embodiment]
As described above, the abnormality detection device 1 of the first embodiment acquires fuel injection amount data indicating the fuel injection amount in the vehicle over a predetermined period, and based on the acquired fuel injection amount data A standard value of the injection amount is calculated. Then, the abnormality detection device 1 compares the fuel injection amount data acquired by the data acquisition unit after the standard value calculation unit calculates the standard value with the standard value, thereby determining whether an abnormality has occurred in the vehicle T. judge. The abnormality detection device 1 that employs the above-described configuration is a standard value that takes into account the operation status peculiar to the vehicle T as compared with a case where an abnormality of the vehicle T is determined by comparing a given reference value with a fuel injection amount. An abnormality can be determined based on the above. Therefore, the abnormality detection device 1 can accurately detect the abnormality of the vehicle.

  The abnormality detection device 1 may calculate the standard value based on the fuel injection amount while the vehicle in the predetermined period is in the idle state. Thereby, since the abnormality detection apparatus 1 can determine abnormality based on the operation state when the load applied to the engine is small, the abnormality of the vehicle T can be detected with high accuracy.

  For example, the abnormality detection device 1 acquires fuel injection amount data after a predetermined time has elapsed since the vehicle was operated. In this way, the abnormality detection device 1 can determine the abnormality of the vehicle T without considering the increase in the fuel injection amount immediately after the engine is operated, and thus can detect the abnormality of the vehicle T with high accuracy.

  The abnormality detection device 1 may calculate the average value or variance of the acquired fuel injection amounts as a standard value. In this way, since the specific operation status of the vehicle T is not set as the standard value of the fuel injection amount, the abnormality detection device 1 can detect the abnormality of the vehicle T with high accuracy. Further, the abnormality detection device 1 can accurately detect an abnormality in the vehicle T in which the fuel injection amount varies greatly.

  Further, the abnormality detection device 1 acquires a correction value of the fuel injection amount, calculates a standard value of the acquired correction value, and compares the correction value acquired after calculating the standard value with the standard value, thereby It may be determined whether or not an abnormality has occurred in T. If it carries out like this, the abnormality detection apparatus 1 can determine whether abnormality has generate | occur | produced for every location in which the sensor was provided. Further, the abnormality detection device 1 can accurately detect an abnormality in a portion that does not greatly contribute to the increase or decrease in the fuel injection amount.

  The abnormality detection device 1 may acquire the fuel injection amount from a plurality of different vehicles having the same vehicle type, and calculate the standard value based on the fuel injection amounts acquired from the plurality of vehicles. This makes it easier for the abnormality detection device 1 to detect whether or not the fuel injection amount has a peculiar behavior as compared with the average vehicle T of the same vehicle type, and thus makes it easier to detect the abnormality of the vehicle T.

<Second Embodiment>
In the first embodiment, the standard value calculation unit 110 calculates a standard value based on the commanded fuel injection amount, and the 2 determination unit 120 compares the fuel injection amount data with the standard value, thereby causing an abnormality in the vehicle T. It was determined whether or not this occurred. As described above, the ECU 20 determines the basic fuel injection amount based on the intake air amount and the engine speed, and adds each correction value associated with the measured value of the sensor to the basic fuel injection amount to indicate the indicated fuel. The injection amount is determined.

  Therefore, in the second embodiment, the data acquisition unit 100 acquires individual correction values corresponding to each sensor to be added to the basic fuel injection amount. Then, the standard value calculation unit 110 calculates a standard value based on individual correction values corresponding to each sensor to be added to the basic fuel injection amount, and the determination unit 120 adds individual correction values to be added to the basic fuel injection amount. Is compared with the standard value calculated by the standard value calculation unit 110 to determine whether or not an abnormality has occurred in any of the sensors of the vehicle T. In this case, since the standard value is calculated based on the individual correction value corresponding to each sensor added to the basic fuel injection amount, the sensor is different from the case where the abnormality of the vehicle T is detected based on the indicated fuel injection amount. It is possible to determine whether or not an abnormality has occurred at each location provided with. Further, unlike the case where an abnormality of the vehicle T is detected based on the commanded fuel injection amount obtained by adding all the correction values, it is possible to accurately detect an abnormality at a location that does not greatly contribute to the increase or decrease in the fuel injection amount.

  In addition, the standard value calculation unit 110 uses a standard value based on a correction value corresponding to a sensor indicating a device state that affects the magnitude of a load on the engine, such as an air conditioner operating state, a power steering operating state, or the like. By calculating, the determination unit 120 can determine the presence or absence of abnormality using a standard value corresponding to the load applied to the engine. As a result, the abnormality detection device 1 of the present embodiment can improve the accuracy of abnormality detection when the load fluctuates.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

S ... Abnormality detection system T ... Vehicle M ... Management base station C ... Data collection center S1 ... Air flow sensor S2 ... Acceleration sensor S3 ... Temperature sensor S4 ... Oxygen Sensor S5 ... Pressure sensor 20 ... ECU
DESCRIPTION OF SYMBOLS 21 ... Communication part 22 ... Alarm 1 ... Abnormality detection apparatus 10 ... Memory | storage part 11 ... 1st communication part 12 ... 2nd communication part 13 ... Control part 100 ... Data acquisition unit 110 ... standard value calculation unit 120 ... determination unit 130 ... abnormality notification unit

Claims (7)

A data acquisition unit for acquiring fuel injection amount data indicating a fuel injection amount in the vehicle over a predetermined period;
A standard value calculation unit that calculates a standard value of the fuel injection amount based on the fuel injection amount data acquired by the data acquisition unit;
Determination that determines whether or not an abnormality has occurred in the vehicle by comparing the fuel injection amount data acquired by the data acquisition unit with the standard value after the standard value calculation unit calculates the standard value And
An anomaly detection device. The standard value calculation unit calculates the standard value based on the fuel injection amount while the vehicle in the predetermined period is in an idle state.
The abnormality detection device according to claim 1. The data acquisition unit acquires the data of the fuel injection amount after a predetermined time has elapsed since the vehicle was operated;
The abnormality detection device according to claim 1 or 2. The standard value calculation unit calculates an average value or variance of the fuel injection amount acquired by the data acquisition unit as the standard value.
The abnormality detection device according to any one of claims 1 to 3. The data acquisition unit acquires a correction value for the fuel injection amount,
The standard value calculation unit calculates a standard value of the correction value acquired by the data acquisition unit,
The determination unit compares the correction value acquired by the data acquisition unit with the standard value after the standard value calculation unit calculates the standard value, thereby determining whether an abnormality has occurred in the vehicle. judge,
The abnormality detection device according to any one of claims 1 to 4. The data acquisition unit acquires the fuel injection amount from a plurality of different vehicles having the same vehicle type,
The standard value calculation unit calculates the standard value based on the fuel injection amount acquired from the plurality of vehicles by the data acquisition unit.
The abnormality detection device according to any one of claims 1 to 5. Obtaining a fuel injection amount in the vehicle over a predetermined period;
Calculating a standard value of the fuel injection amount based on the acquired fuel injection amount;
Determining whether an abnormality has occurred in the vehicle by comparing the fuel injection amount acquired after calculating the standard value with the standard value;
An abnormality detection method comprising:

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